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Merge branches 'core', 'arm/omap', 'iommu/fixes', 'arm/tegra', 'arm/shmobile', 'arm...
[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 MODULE_AUTHOR("http://www.comedi.org");
53 MODULE_DESCRIPTION("Comedi core module");
54 MODULE_LICENSE("GPL");
55
56 #ifdef CONFIG_COMEDI_DEBUG
57 int comedi_debug;
58 EXPORT_SYMBOL(comedi_debug);
59 module_param(comedi_debug, int, S_IRUGO | S_IWUSR);
60 MODULE_PARM_DESC(comedi_debug,
61 "enable comedi core and driver debugging if non-zero (default 0)"
62 );
63 #endif
64
65 bool comedi_autoconfig = 1;
66 module_param(comedi_autoconfig, bool, S_IRUGO);
67 MODULE_PARM_DESC(comedi_autoconfig,
68 "enable drivers to auto-configure comedi devices (default 1)");
69
70 static int comedi_num_legacy_minors;
71 module_param(comedi_num_legacy_minors, int, S_IRUGO);
72 MODULE_PARM_DESC(comedi_num_legacy_minors,
73 "number of comedi minor devices to reserve for non-auto-configured devices (default 0)"
74 );
75
76 unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB;
77 module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR);
78 MODULE_PARM_DESC(comedi_default_buf_size_kb,
79 "default asynchronous buffer size in KiB (default "
80 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")");
81
82 unsigned int comedi_default_buf_maxsize_kb
83 = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB;
84 module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR);
85 MODULE_PARM_DESC(comedi_default_buf_maxsize_kb,
86 "default maximum size of asynchronous buffer in KiB (default "
87 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")");
88
89 static DEFINE_SPINLOCK(comedi_file_info_table_lock);
90 static struct comedi_device_file_info
91 *comedi_file_info_table[COMEDI_NUM_MINORS];
92
93 static void do_become_nonbusy(struct comedi_device *dev,
94 struct comedi_subdevice *s);
95 static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
96
97 static int comedi_fasync(int fd, struct file *file, int on);
98
99 static int is_device_busy(struct comedi_device *dev);
100
101 static int resize_async_buffer(struct comedi_device *dev,
102 struct comedi_subdevice *s,
103 struct comedi_async *async, unsigned new_size)
104 {
105 int retval;
106
107 if (new_size > async->max_bufsize)
108 return -EPERM;
109
110 if (s->busy) {
111 DPRINTK("subdevice is busy, cannot resize buffer\n");
112 return -EBUSY;
113 }
114 if (async->mmap_count) {
115 DPRINTK("subdevice is mmapped, cannot resize buffer\n");
116 return -EBUSY;
117 }
118
119 if (!async->prealloc_buf)
120 return -EINVAL;
121
122 /* make sure buffer is an integral number of pages
123 * (we round up) */
124 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
125
126 retval = comedi_buf_alloc(dev, s, new_size);
127 if (retval < 0)
128 return retval;
129
130 if (s->buf_change) {
131 retval = s->buf_change(dev, s, new_size);
132 if (retval < 0)
133 return retval;
134 }
135
136 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
137 dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz);
138 return 0;
139 }
140
141 /* sysfs attribute files */
142
143 static ssize_t show_max_read_buffer_kb(struct device *dev,
144 struct device_attribute *attr, char *buf)
145 {
146 struct comedi_device_file_info *info = dev_get_drvdata(dev);
147 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
148 unsigned int size = 0;
149
150 mutex_lock(&info->device->mutex);
151 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
152 size = s->async->max_bufsize / 1024;
153 mutex_unlock(&info->device->mutex);
154
155 return snprintf(buf, PAGE_SIZE, "%i\n", size);
156 }
157
158 static ssize_t store_max_read_buffer_kb(struct device *dev,
159 struct device_attribute *attr,
160 const char *buf, size_t count)
161 {
162 struct comedi_device_file_info *info = dev_get_drvdata(dev);
163 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
164 unsigned int size;
165 int err;
166
167 err = kstrtouint(buf, 10, &size);
168 if (err)
169 return err;
170 if (size > (UINT_MAX / 1024))
171 return -EINVAL;
172 size *= 1024;
173
174 mutex_lock(&info->device->mutex);
175 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
176 s->async->max_bufsize = size;
177 else
178 err = -EINVAL;
179 mutex_unlock(&info->device->mutex);
180
181 return err ? err : count;
182 }
183
184 static ssize_t show_read_buffer_kb(struct device *dev,
185 struct device_attribute *attr, char *buf)
186 {
187 struct comedi_device_file_info *info = dev_get_drvdata(dev);
188 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
189 unsigned int size = 0;
190
191 mutex_lock(&info->device->mutex);
192 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
193 size = s->async->prealloc_bufsz / 1024;
194 mutex_unlock(&info->device->mutex);
195
196 return snprintf(buf, PAGE_SIZE, "%i\n", size);
197 }
198
199 static ssize_t store_read_buffer_kb(struct device *dev,
200 struct device_attribute *attr,
201 const char *buf, size_t count)
202 {
203 struct comedi_device_file_info *info = dev_get_drvdata(dev);
204 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
205 unsigned int size;
206 int err;
207
208 err = kstrtouint(buf, 10, &size);
209 if (err)
210 return err;
211 if (size > (UINT_MAX / 1024))
212 return -EINVAL;
213 size *= 1024;
214
215 mutex_lock(&info->device->mutex);
216 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
217 err = resize_async_buffer(info->device, s, s->async, size);
218 else
219 err = -EINVAL;
220 mutex_unlock(&info->device->mutex);
221
222 return err ? err : count;
223 }
224
225 static ssize_t show_max_write_buffer_kb(struct device *dev,
226 struct device_attribute *attr,
227 char *buf)
228 {
229 struct comedi_device_file_info *info = dev_get_drvdata(dev);
230 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
231 unsigned int size = 0;
232
233 mutex_lock(&info->device->mutex);
234 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
235 size = s->async->max_bufsize / 1024;
236 mutex_unlock(&info->device->mutex);
237
238 return snprintf(buf, PAGE_SIZE, "%i\n", size);
239 }
240
241 static ssize_t store_max_write_buffer_kb(struct device *dev,
242 struct device_attribute *attr,
243 const char *buf, size_t count)
244 {
245 struct comedi_device_file_info *info = dev_get_drvdata(dev);
246 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
247 unsigned int size;
248 int err;
249
250 err = kstrtouint(buf, 10, &size);
251 if (err)
252 return err;
253 if (size > (UINT_MAX / 1024))
254 return -EINVAL;
255 size *= 1024;
256
257 mutex_lock(&info->device->mutex);
258 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
259 s->async->max_bufsize = size;
260 else
261 err = -EINVAL;
262 mutex_unlock(&info->device->mutex);
263
264 return err ? err : count;
265 }
266
267 static ssize_t show_write_buffer_kb(struct device *dev,
268 struct device_attribute *attr, char *buf)
269 {
270 struct comedi_device_file_info *info = dev_get_drvdata(dev);
271 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
272 unsigned int size = 0;
273
274 mutex_lock(&info->device->mutex);
275 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
276 size = s->async->prealloc_bufsz / 1024;
277 mutex_unlock(&info->device->mutex);
278
279 return snprintf(buf, PAGE_SIZE, "%i\n", size);
280 }
281
282 static ssize_t store_write_buffer_kb(struct device *dev,
283 struct device_attribute *attr,
284 const char *buf, size_t count)
285 {
286 struct comedi_device_file_info *info = dev_get_drvdata(dev);
287 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
288 unsigned int size;
289 int err;
290
291 err = kstrtouint(buf, 10, &size);
292 if (err)
293 return err;
294 if (size > (UINT_MAX / 1024))
295 return -EINVAL;
296 size *= 1024;
297
298 mutex_lock(&info->device->mutex);
299 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
300 err = resize_async_buffer(info->device, s, s->async, size);
301 else
302 err = -EINVAL;
303 mutex_unlock(&info->device->mutex);
304
305 return err ? err : count;
306 }
307
308 static struct device_attribute comedi_dev_attrs[] = {
309 __ATTR(max_read_buffer_kb, S_IRUGO | S_IWUSR,
310 show_max_read_buffer_kb, store_max_read_buffer_kb),
311 __ATTR(read_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
312 show_read_buffer_kb, store_read_buffer_kb),
313 __ATTR(max_write_buffer_kb, S_IRUGO | S_IWUSR,
314 show_max_write_buffer_kb, store_max_write_buffer_kb),
315 __ATTR(write_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
316 show_write_buffer_kb, store_write_buffer_kb),
317 __ATTR_NULL
318 };
319
320 /*
321 COMEDI_DEVCONFIG
322 device config ioctl
323
324 arg:
325 pointer to devconfig structure
326
327 reads:
328 devconfig structure at arg
329
330 writes:
331 none
332 */
333 static int do_devconfig_ioctl(struct comedi_device *dev,
334 struct comedi_devconfig __user *arg)
335 {
336 struct comedi_devconfig it;
337 int ret;
338 unsigned char *aux_data = NULL;
339 int aux_len;
340
341 if (!capable(CAP_SYS_ADMIN))
342 return -EPERM;
343
344 if (arg == NULL) {
345 if (is_device_busy(dev))
346 return -EBUSY;
347 if (dev->attached) {
348 struct module *driver_module = dev->driver->module;
349 comedi_device_detach(dev);
350 module_put(driver_module);
351 }
352 return 0;
353 }
354
355 if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig)))
356 return -EFAULT;
357
358 it.board_name[COMEDI_NAMELEN - 1] = 0;
359
360 if (comedi_aux_data(it.options, 0) &&
361 it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
362 int bit_shift;
363 aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH];
364 if (aux_len < 0)
365 return -EFAULT;
366
367 aux_data = vmalloc(aux_len);
368 if (!aux_data)
369 return -ENOMEM;
370
371 if (copy_from_user(aux_data,
372 (unsigned char __user *
373 )comedi_aux_data(it.options, 0), aux_len)) {
374 vfree(aux_data);
375 return -EFAULT;
376 }
377 it.options[COMEDI_DEVCONF_AUX_DATA_LO] =
378 (unsigned long)aux_data;
379 if (sizeof(void *) > sizeof(int)) {
380 bit_shift = sizeof(int) * 8;
381 it.options[COMEDI_DEVCONF_AUX_DATA_HI] =
382 ((unsigned long)aux_data) >> bit_shift;
383 } else
384 it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0;
385 }
386
387 ret = comedi_device_attach(dev, &it);
388 if (ret == 0) {
389 if (!try_module_get(dev->driver->module)) {
390 comedi_device_detach(dev);
391 ret = -ENOSYS;
392 }
393 }
394
395 if (aux_data)
396 vfree(aux_data);
397
398 return ret;
399 }
400
401 /*
402 COMEDI_BUFCONFIG
403 buffer configuration ioctl
404
405 arg:
406 pointer to bufconfig structure
407
408 reads:
409 bufconfig at arg
410
411 writes:
412 modified bufconfig at arg
413
414 */
415 static int do_bufconfig_ioctl(struct comedi_device *dev,
416 struct comedi_bufconfig __user *arg)
417 {
418 struct comedi_bufconfig bc;
419 struct comedi_async *async;
420 struct comedi_subdevice *s;
421 int retval = 0;
422
423 if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig)))
424 return -EFAULT;
425
426 if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0)
427 return -EINVAL;
428
429 s = &dev->subdevices[bc.subdevice];
430 async = s->async;
431
432 if (!async) {
433 DPRINTK("subdevice does not have async capability\n");
434 bc.size = 0;
435 bc.maximum_size = 0;
436 goto copyback;
437 }
438
439 if (bc.maximum_size) {
440 if (!capable(CAP_SYS_ADMIN))
441 return -EPERM;
442
443 async->max_bufsize = bc.maximum_size;
444 }
445
446 if (bc.size) {
447 retval = resize_async_buffer(dev, s, async, bc.size);
448 if (retval < 0)
449 return retval;
450 }
451
452 bc.size = async->prealloc_bufsz;
453 bc.maximum_size = async->max_bufsize;
454
455 copyback:
456 if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig)))
457 return -EFAULT;
458
459 return 0;
460 }
461
462 /*
463 COMEDI_DEVINFO
464 device info ioctl
465
466 arg:
467 pointer to devinfo structure
468
469 reads:
470 none
471
472 writes:
473 devinfo structure
474
475 */
476 static int do_devinfo_ioctl(struct comedi_device *dev,
477 struct comedi_devinfo __user *arg,
478 struct file *file)
479 {
480 struct comedi_devinfo devinfo;
481 const unsigned minor = iminor(file->f_dentry->d_inode);
482 struct comedi_device_file_info *dev_file_info =
483 comedi_get_device_file_info(minor);
484 struct comedi_subdevice *read_subdev =
485 comedi_get_read_subdevice(dev_file_info);
486 struct comedi_subdevice *write_subdev =
487 comedi_get_write_subdevice(dev_file_info);
488
489 memset(&devinfo, 0, sizeof(devinfo));
490
491 /* fill devinfo structure */
492 devinfo.version_code = COMEDI_VERSION_CODE;
493 devinfo.n_subdevs = dev->n_subdevices;
494 strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
495 strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
496
497 if (read_subdev)
498 devinfo.read_subdevice = read_subdev - dev->subdevices;
499 else
500 devinfo.read_subdevice = -1;
501
502 if (write_subdev)
503 devinfo.write_subdevice = write_subdev - dev->subdevices;
504 else
505 devinfo.write_subdevice = -1;
506
507 if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo)))
508 return -EFAULT;
509
510 return 0;
511 }
512
513 /*
514 COMEDI_SUBDINFO
515 subdevice info ioctl
516
517 arg:
518 pointer to array of subdevice info structures
519
520 reads:
521 none
522
523 writes:
524 array of subdevice info structures at arg
525
526 */
527 static int do_subdinfo_ioctl(struct comedi_device *dev,
528 struct comedi_subdinfo __user *arg, void *file)
529 {
530 int ret, i;
531 struct comedi_subdinfo *tmp, *us;
532 struct comedi_subdevice *s;
533
534 tmp =
535 kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo),
536 GFP_KERNEL);
537 if (!tmp)
538 return -ENOMEM;
539
540 /* fill subdinfo structs */
541 for (i = 0; i < dev->n_subdevices; i++) {
542 s = &dev->subdevices[i];
543 us = tmp + i;
544
545 us->type = s->type;
546 us->n_chan = s->n_chan;
547 us->subd_flags = s->subdev_flags;
548 if (comedi_get_subdevice_runflags(s) & SRF_RUNNING)
549 us->subd_flags |= SDF_RUNNING;
550 #define TIMER_nanosec 5 /* backwards compatibility */
551 us->timer_type = TIMER_nanosec;
552 us->len_chanlist = s->len_chanlist;
553 us->maxdata = s->maxdata;
554 if (s->range_table) {
555 us->range_type =
556 (i << 24) | (0 << 16) | (s->range_table->length);
557 } else {
558 us->range_type = 0; /* XXX */
559 }
560 us->flags = s->flags;
561
562 if (s->busy)
563 us->subd_flags |= SDF_BUSY;
564 if (s->busy == file)
565 us->subd_flags |= SDF_BUSY_OWNER;
566 if (s->lock)
567 us->subd_flags |= SDF_LOCKED;
568 if (s->lock == file)
569 us->subd_flags |= SDF_LOCK_OWNER;
570 if (!s->maxdata && s->maxdata_list)
571 us->subd_flags |= SDF_MAXDATA;
572 if (s->flaglist)
573 us->subd_flags |= SDF_FLAGS;
574 if (s->range_table_list)
575 us->subd_flags |= SDF_RANGETYPE;
576 if (s->do_cmd)
577 us->subd_flags |= SDF_CMD;
578
579 if (s->insn_bits != &insn_inval)
580 us->insn_bits_support = COMEDI_SUPPORTED;
581 else
582 us->insn_bits_support = COMEDI_UNSUPPORTED;
583
584 us->settling_time_0 = s->settling_time_0;
585 }
586
587 ret = copy_to_user(arg, tmp,
588 dev->n_subdevices * sizeof(struct comedi_subdinfo));
589
590 kfree(tmp);
591
592 return ret ? -EFAULT : 0;
593 }
594
595 /*
596 COMEDI_CHANINFO
597 subdevice info ioctl
598
599 arg:
600 pointer to chaninfo structure
601
602 reads:
603 chaninfo structure at arg
604
605 writes:
606 arrays at elements of chaninfo structure
607
608 */
609 static int do_chaninfo_ioctl(struct comedi_device *dev,
610 struct comedi_chaninfo __user *arg)
611 {
612 struct comedi_subdevice *s;
613 struct comedi_chaninfo it;
614
615 if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo)))
616 return -EFAULT;
617
618 if (it.subdev >= dev->n_subdevices)
619 return -EINVAL;
620 s = &dev->subdevices[it.subdev];
621
622 if (it.maxdata_list) {
623 if (s->maxdata || !s->maxdata_list)
624 return -EINVAL;
625 if (copy_to_user(it.maxdata_list, s->maxdata_list,
626 s->n_chan * sizeof(unsigned int)))
627 return -EFAULT;
628 }
629
630 if (it.flaglist) {
631 if (!s->flaglist)
632 return -EINVAL;
633 if (copy_to_user(it.flaglist, s->flaglist,
634 s->n_chan * sizeof(unsigned int)))
635 return -EFAULT;
636 }
637
638 if (it.rangelist) {
639 int i;
640
641 if (!s->range_table_list)
642 return -EINVAL;
643 for (i = 0; i < s->n_chan; i++) {
644 int x;
645
646 x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
647 (s->range_table_list[i]->length);
648 if (put_user(x, it.rangelist + i))
649 return -EFAULT;
650 }
651 #if 0
652 if (copy_to_user(it.rangelist, s->range_type_list,
653 s->n_chan * sizeof(unsigned int)))
654 return -EFAULT;
655 #endif
656 }
657
658 return 0;
659 }
660
661 /*
662 COMEDI_BUFINFO
663 buffer information ioctl
664
665 arg:
666 pointer to bufinfo structure
667
668 reads:
669 bufinfo at arg
670
671 writes:
672 modified bufinfo at arg
673
674 */
675 static int do_bufinfo_ioctl(struct comedi_device *dev,
676 struct comedi_bufinfo __user *arg, void *file)
677 {
678 struct comedi_bufinfo bi;
679 struct comedi_subdevice *s;
680 struct comedi_async *async;
681
682 if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo)))
683 return -EFAULT;
684
685 if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0)
686 return -EINVAL;
687
688 s = &dev->subdevices[bi.subdevice];
689
690 if (s->lock && s->lock != file)
691 return -EACCES;
692
693 async = s->async;
694
695 if (!async) {
696 DPRINTK("subdevice does not have async capability\n");
697 bi.buf_write_ptr = 0;
698 bi.buf_read_ptr = 0;
699 bi.buf_write_count = 0;
700 bi.buf_read_count = 0;
701 bi.bytes_read = 0;
702 bi.bytes_written = 0;
703 goto copyback;
704 }
705 if (!s->busy) {
706 bi.bytes_read = 0;
707 bi.bytes_written = 0;
708 goto copyback_position;
709 }
710 if (s->busy != file)
711 return -EACCES;
712
713 if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) {
714 bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read);
715 comedi_buf_read_free(async, bi.bytes_read);
716
717 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR |
718 SRF_RUNNING))
719 && async->buf_write_count == async->buf_read_count) {
720 do_become_nonbusy(dev, s);
721 }
722 }
723
724 if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) {
725 bi.bytes_written =
726 comedi_buf_write_alloc(async, bi.bytes_written);
727 comedi_buf_write_free(async, bi.bytes_written);
728 }
729
730 copyback_position:
731 bi.buf_write_count = async->buf_write_count;
732 bi.buf_write_ptr = async->buf_write_ptr;
733 bi.buf_read_count = async->buf_read_count;
734 bi.buf_read_ptr = async->buf_read_ptr;
735
736 copyback:
737 if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo)))
738 return -EFAULT;
739
740 return 0;
741 }
742
743 static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
744 unsigned int *data, void *file);
745 /*
746 * COMEDI_INSNLIST
747 * synchronous instructions
748 *
749 * arg:
750 * pointer to sync cmd structure
751 *
752 * reads:
753 * sync cmd struct at arg
754 * instruction list
755 * data (for writes)
756 *
757 * writes:
758 * data (for reads)
759 */
760 /* arbitrary limits */
761 #define MAX_SAMPLES 256
762 static int do_insnlist_ioctl(struct comedi_device *dev,
763 struct comedi_insnlist __user *arg, void *file)
764 {
765 struct comedi_insnlist insnlist;
766 struct comedi_insn *insns = NULL;
767 unsigned int *data = NULL;
768 int i = 0;
769 int ret = 0;
770
771 if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist)))
772 return -EFAULT;
773
774 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
775 if (!data) {
776 DPRINTK("kmalloc failed\n");
777 ret = -ENOMEM;
778 goto error;
779 }
780
781 insns =
782 kcalloc(insnlist.n_insns, sizeof(struct comedi_insn), GFP_KERNEL);
783 if (!insns) {
784 DPRINTK("kmalloc failed\n");
785 ret = -ENOMEM;
786 goto error;
787 }
788
789 if (copy_from_user(insns, insnlist.insns,
790 sizeof(struct comedi_insn) * insnlist.n_insns)) {
791 DPRINTK("copy_from_user failed\n");
792 ret = -EFAULT;
793 goto error;
794 }
795
796 for (i = 0; i < insnlist.n_insns; i++) {
797 if (insns[i].n > MAX_SAMPLES) {
798 DPRINTK("number of samples too large\n");
799 ret = -EINVAL;
800 goto error;
801 }
802 if (insns[i].insn & INSN_MASK_WRITE) {
803 if (copy_from_user(data, insns[i].data,
804 insns[i].n * sizeof(unsigned int))) {
805 DPRINTK("copy_from_user failed\n");
806 ret = -EFAULT;
807 goto error;
808 }
809 }
810 ret = parse_insn(dev, insns + i, data, file);
811 if (ret < 0)
812 goto error;
813 if (insns[i].insn & INSN_MASK_READ) {
814 if (copy_to_user(insns[i].data, data,
815 insns[i].n * sizeof(unsigned int))) {
816 DPRINTK("copy_to_user failed\n");
817 ret = -EFAULT;
818 goto error;
819 }
820 }
821 if (need_resched())
822 schedule();
823 }
824
825 error:
826 kfree(insns);
827 kfree(data);
828
829 if (ret < 0)
830 return ret;
831 return i;
832 }
833
834 static int check_insn_config_length(struct comedi_insn *insn,
835 unsigned int *data)
836 {
837 if (insn->n < 1)
838 return -EINVAL;
839
840 switch (data[0]) {
841 case INSN_CONFIG_DIO_OUTPUT:
842 case INSN_CONFIG_DIO_INPUT:
843 case INSN_CONFIG_DISARM:
844 case INSN_CONFIG_RESET:
845 if (insn->n == 1)
846 return 0;
847 break;
848 case INSN_CONFIG_ARM:
849 case INSN_CONFIG_DIO_QUERY:
850 case INSN_CONFIG_BLOCK_SIZE:
851 case INSN_CONFIG_FILTER:
852 case INSN_CONFIG_SERIAL_CLOCK:
853 case INSN_CONFIG_BIDIRECTIONAL_DATA:
854 case INSN_CONFIG_ALT_SOURCE:
855 case INSN_CONFIG_SET_COUNTER_MODE:
856 case INSN_CONFIG_8254_READ_STATUS:
857 case INSN_CONFIG_SET_ROUTING:
858 case INSN_CONFIG_GET_ROUTING:
859 case INSN_CONFIG_GET_PWM_STATUS:
860 case INSN_CONFIG_PWM_SET_PERIOD:
861 case INSN_CONFIG_PWM_GET_PERIOD:
862 if (insn->n == 2)
863 return 0;
864 break;
865 case INSN_CONFIG_SET_GATE_SRC:
866 case INSN_CONFIG_GET_GATE_SRC:
867 case INSN_CONFIG_SET_CLOCK_SRC:
868 case INSN_CONFIG_GET_CLOCK_SRC:
869 case INSN_CONFIG_SET_OTHER_SRC:
870 case INSN_CONFIG_GET_COUNTER_STATUS:
871 case INSN_CONFIG_PWM_SET_H_BRIDGE:
872 case INSN_CONFIG_PWM_GET_H_BRIDGE:
873 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE:
874 if (insn->n == 3)
875 return 0;
876 break;
877 case INSN_CONFIG_PWM_OUTPUT:
878 case INSN_CONFIG_ANALOG_TRIG:
879 if (insn->n == 5)
880 return 0;
881 break;
882 case INSN_CONFIG_DIGITAL_TRIG:
883 if (insn->n == 6)
884 return 0;
885 break;
886 /* by default we allow the insn since we don't have checks for
887 * all possible cases yet */
888 default:
889 pr_warn("comedi: No check for data length of config insn id %i is implemented.\n",
890 data[0]);
891 pr_warn("comedi: Add a check to %s in %s.\n",
892 __func__, __FILE__);
893 pr_warn("comedi: Assuming n=%i is correct.\n", insn->n);
894 return 0;
895 }
896 return -EINVAL;
897 }
898
899 static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
900 unsigned int *data, void *file)
901 {
902 struct comedi_subdevice *s;
903 int ret = 0;
904 int i;
905
906 if (insn->insn & INSN_MASK_SPECIAL) {
907 /* a non-subdevice instruction */
908
909 switch (insn->insn) {
910 case INSN_GTOD:
911 {
912 struct timeval tv;
913
914 if (insn->n != 2) {
915 ret = -EINVAL;
916 break;
917 }
918
919 do_gettimeofday(&tv);
920 data[0] = tv.tv_sec;
921 data[1] = tv.tv_usec;
922 ret = 2;
923
924 break;
925 }
926 case INSN_WAIT:
927 if (insn->n != 1 || data[0] >= 100000) {
928 ret = -EINVAL;
929 break;
930 }
931 udelay(data[0] / 1000);
932 ret = 1;
933 break;
934 case INSN_INTTRIG:
935 if (insn->n != 1) {
936 ret = -EINVAL;
937 break;
938 }
939 if (insn->subdev >= dev->n_subdevices) {
940 DPRINTK("%d not usable subdevice\n",
941 insn->subdev);
942 ret = -EINVAL;
943 break;
944 }
945 s = &dev->subdevices[insn->subdev];
946 if (!s->async) {
947 DPRINTK("no async\n");
948 ret = -EINVAL;
949 break;
950 }
951 if (!s->async->inttrig) {
952 DPRINTK("no inttrig\n");
953 ret = -EAGAIN;
954 break;
955 }
956 ret = s->async->inttrig(dev, s, data[0]);
957 if (ret >= 0)
958 ret = 1;
959 break;
960 default:
961 DPRINTK("invalid insn\n");
962 ret = -EINVAL;
963 break;
964 }
965 } else {
966 /* a subdevice instruction */
967 unsigned int maxdata;
968
969 if (insn->subdev >= dev->n_subdevices) {
970 DPRINTK("subdevice %d out of range\n", insn->subdev);
971 ret = -EINVAL;
972 goto out;
973 }
974 s = &dev->subdevices[insn->subdev];
975
976 if (s->type == COMEDI_SUBD_UNUSED) {
977 DPRINTK("%d not usable subdevice\n", insn->subdev);
978 ret = -EIO;
979 goto out;
980 }
981
982 /* are we locked? (ioctl lock) */
983 if (s->lock && s->lock != file) {
984 DPRINTK("device locked\n");
985 ret = -EACCES;
986 goto out;
987 }
988
989 ret = comedi_check_chanlist(s, 1, &insn->chanspec);
990 if (ret < 0) {
991 ret = -EINVAL;
992 DPRINTK("bad chanspec\n");
993 goto out;
994 }
995
996 if (s->busy) {
997 ret = -EBUSY;
998 goto out;
999 }
1000 /* This looks arbitrary. It is. */
1001 s->busy = &parse_insn;
1002 switch (insn->insn) {
1003 case INSN_READ:
1004 ret = s->insn_read(dev, s, insn, data);
1005 break;
1006 case INSN_WRITE:
1007 maxdata = s->maxdata_list
1008 ? s->maxdata_list[CR_CHAN(insn->chanspec)]
1009 : s->maxdata;
1010 for (i = 0; i < insn->n; ++i) {
1011 if (data[i] > maxdata) {
1012 ret = -EINVAL;
1013 DPRINTK("bad data value(s)\n");
1014 break;
1015 }
1016 }
1017 if (ret == 0)
1018 ret = s->insn_write(dev, s, insn, data);
1019 break;
1020 case INSN_BITS:
1021 if (insn->n != 2) {
1022 ret = -EINVAL;
1023 } else {
1024 /* Most drivers ignore the base channel in
1025 * insn->chanspec. Fix this here if
1026 * the subdevice has <= 32 channels. */
1027 unsigned int shift;
1028 unsigned int orig_mask;
1029
1030 orig_mask = data[0];
1031 if (s->n_chan <= 32) {
1032 shift = CR_CHAN(insn->chanspec);
1033 if (shift > 0) {
1034 insn->chanspec = 0;
1035 data[0] <<= shift;
1036 data[1] <<= shift;
1037 }
1038 } else
1039 shift = 0;
1040 ret = s->insn_bits(dev, s, insn, data);
1041 data[0] = orig_mask;
1042 if (shift > 0)
1043 data[1] >>= shift;
1044 }
1045 break;
1046 case INSN_CONFIG:
1047 ret = check_insn_config_length(insn, data);
1048 if (ret)
1049 break;
1050 ret = s->insn_config(dev, s, insn, data);
1051 break;
1052 default:
1053 ret = -EINVAL;
1054 break;
1055 }
1056
1057 s->busy = NULL;
1058 }
1059
1060 out:
1061 return ret;
1062 }
1063
1064 /*
1065 * COMEDI_INSN
1066 * synchronous instructions
1067 *
1068 * arg:
1069 * pointer to insn
1070 *
1071 * reads:
1072 * struct comedi_insn struct at arg
1073 * data (for writes)
1074 *
1075 * writes:
1076 * data (for reads)
1077 */
1078 static int do_insn_ioctl(struct comedi_device *dev,
1079 struct comedi_insn __user *arg, void *file)
1080 {
1081 struct comedi_insn insn;
1082 unsigned int *data = NULL;
1083 int ret = 0;
1084
1085 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
1086 if (!data) {
1087 ret = -ENOMEM;
1088 goto error;
1089 }
1090
1091 if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) {
1092 ret = -EFAULT;
1093 goto error;
1094 }
1095
1096 /* This is where the behavior of insn and insnlist deviate. */
1097 if (insn.n > MAX_SAMPLES)
1098 insn.n = MAX_SAMPLES;
1099 if (insn.insn & INSN_MASK_WRITE) {
1100 if (copy_from_user(data,
1101 insn.data,
1102 insn.n * sizeof(unsigned int))) {
1103 ret = -EFAULT;
1104 goto error;
1105 }
1106 }
1107 ret = parse_insn(dev, &insn, data, file);
1108 if (ret < 0)
1109 goto error;
1110 if (insn.insn & INSN_MASK_READ) {
1111 if (copy_to_user(insn.data,
1112 data,
1113 insn.n * sizeof(unsigned int))) {
1114 ret = -EFAULT;
1115 goto error;
1116 }
1117 }
1118 ret = insn.n;
1119
1120 error:
1121 kfree(data);
1122
1123 return ret;
1124 }
1125
1126 static void comedi_set_subdevice_runflags(struct comedi_subdevice *s,
1127 unsigned mask, unsigned bits)
1128 {
1129 unsigned long flags;
1130
1131 spin_lock_irqsave(&s->spin_lock, flags);
1132 s->runflags &= ~mask;
1133 s->runflags |= (bits & mask);
1134 spin_unlock_irqrestore(&s->spin_lock, flags);
1135 }
1136
1137 static int do_cmd_ioctl(struct comedi_device *dev,
1138 struct comedi_cmd __user *arg, void *file)
1139 {
1140 struct comedi_cmd cmd;
1141 struct comedi_subdevice *s;
1142 struct comedi_async *async;
1143 int ret = 0;
1144 unsigned int __user *user_chanlist;
1145
1146 if (copy_from_user(&cmd, arg, sizeof(struct comedi_cmd))) {
1147 DPRINTK("bad cmd address\n");
1148 return -EFAULT;
1149 }
1150 /* save user's chanlist pointer so it can be restored later */
1151 user_chanlist = (unsigned int __user *)cmd.chanlist;
1152
1153 if (cmd.subdev >= dev->n_subdevices) {
1154 DPRINTK("%d no such subdevice\n", cmd.subdev);
1155 return -ENODEV;
1156 }
1157
1158 s = &dev->subdevices[cmd.subdev];
1159 async = s->async;
1160
1161 if (s->type == COMEDI_SUBD_UNUSED) {
1162 DPRINTK("%d not valid subdevice\n", cmd.subdev);
1163 return -EIO;
1164 }
1165
1166 if (!s->do_cmd || !s->do_cmdtest || !s->async) {
1167 DPRINTK("subdevice %i does not support commands\n",
1168 cmd.subdev);
1169 return -EIO;
1170 }
1171
1172 /* are we locked? (ioctl lock) */
1173 if (s->lock && s->lock != file) {
1174 DPRINTK("subdevice locked\n");
1175 return -EACCES;
1176 }
1177
1178 /* are we busy? */
1179 if (s->busy) {
1180 DPRINTK("subdevice busy\n");
1181 return -EBUSY;
1182 }
1183 s->busy = file;
1184
1185 /* make sure channel/gain list isn't too long */
1186 if (cmd.chanlist_len > s->len_chanlist) {
1187 DPRINTK("channel/gain list too long %u > %d\n",
1188 cmd.chanlist_len, s->len_chanlist);
1189 ret = -EINVAL;
1190 goto cleanup;
1191 }
1192
1193 /* make sure channel/gain list isn't too short */
1194 if (cmd.chanlist_len < 1) {
1195 DPRINTK("channel/gain list too short %u < 1\n",
1196 cmd.chanlist_len);
1197 ret = -EINVAL;
1198 goto cleanup;
1199 }
1200
1201 async->cmd = cmd;
1202 async->cmd.data = NULL;
1203 /* load channel/gain list */
1204 async->cmd.chanlist =
1205 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1206 if (!async->cmd.chanlist) {
1207 DPRINTK("allocation failed\n");
1208 ret = -ENOMEM;
1209 goto cleanup;
1210 }
1211
1212 if (copy_from_user(async->cmd.chanlist, user_chanlist,
1213 async->cmd.chanlist_len * sizeof(int))) {
1214 DPRINTK("fault reading chanlist\n");
1215 ret = -EFAULT;
1216 goto cleanup;
1217 }
1218
1219 /* make sure each element in channel/gain list is valid */
1220 ret = comedi_check_chanlist(s,
1221 async->cmd.chanlist_len,
1222 async->cmd.chanlist);
1223 if (ret < 0) {
1224 DPRINTK("bad chanlist\n");
1225 goto cleanup;
1226 }
1227
1228 ret = s->do_cmdtest(dev, s, &async->cmd);
1229
1230 if (async->cmd.flags & TRIG_BOGUS || ret) {
1231 DPRINTK("test returned %d\n", ret);
1232 cmd = async->cmd;
1233 /* restore chanlist pointer before copying back */
1234 cmd.chanlist = (unsigned int __force *)user_chanlist;
1235 cmd.data = NULL;
1236 if (copy_to_user(arg, &cmd, sizeof(struct comedi_cmd))) {
1237 DPRINTK("fault writing cmd\n");
1238 ret = -EFAULT;
1239 goto cleanup;
1240 }
1241 ret = -EAGAIN;
1242 goto cleanup;
1243 }
1244
1245 if (!async->prealloc_bufsz) {
1246 ret = -ENOMEM;
1247 DPRINTK("no buffer (?)\n");
1248 goto cleanup;
1249 }
1250
1251 comedi_reset_async_buf(async);
1252
1253 async->cb_mask =
1254 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
1255 COMEDI_CB_OVERFLOW;
1256 if (async->cmd.flags & TRIG_WAKE_EOS)
1257 async->cb_mask |= COMEDI_CB_EOS;
1258
1259 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
1260
1261 ret = s->do_cmd(dev, s);
1262 if (ret == 0)
1263 return 0;
1264
1265 cleanup:
1266 do_become_nonbusy(dev, s);
1267
1268 return ret;
1269 }
1270
1271 /*
1272 COMEDI_CMDTEST
1273 command testing ioctl
1274
1275 arg:
1276 pointer to cmd structure
1277
1278 reads:
1279 cmd structure at arg
1280 channel/range list
1281
1282 writes:
1283 modified cmd structure at arg
1284
1285 */
1286 static int do_cmdtest_ioctl(struct comedi_device *dev,
1287 struct comedi_cmd __user *arg, void *file)
1288 {
1289 struct comedi_cmd cmd;
1290 struct comedi_subdevice *s;
1291 int ret = 0;
1292 unsigned int *chanlist = NULL;
1293 unsigned int __user *user_chanlist;
1294
1295 if (copy_from_user(&cmd, arg, sizeof(struct comedi_cmd))) {
1296 DPRINTK("bad cmd address\n");
1297 return -EFAULT;
1298 }
1299 /* save user's chanlist pointer so it can be restored later */
1300 user_chanlist = (unsigned int __user *)cmd.chanlist;
1301
1302 if (cmd.subdev >= dev->n_subdevices) {
1303 DPRINTK("%d no such subdevice\n", cmd.subdev);
1304 return -ENODEV;
1305 }
1306
1307 s = &dev->subdevices[cmd.subdev];
1308 if (s->type == COMEDI_SUBD_UNUSED) {
1309 DPRINTK("%d not valid subdevice\n", cmd.subdev);
1310 return -EIO;
1311 }
1312
1313 if (!s->do_cmd || !s->do_cmdtest) {
1314 DPRINTK("subdevice %i does not support commands\n",
1315 cmd.subdev);
1316 return -EIO;
1317 }
1318
1319 /* make sure channel/gain list isn't too long */
1320 if (cmd.chanlist_len > s->len_chanlist) {
1321 DPRINTK("channel/gain list too long %d > %d\n",
1322 cmd.chanlist_len, s->len_chanlist);
1323 ret = -EINVAL;
1324 goto cleanup;
1325 }
1326
1327 /* load channel/gain list */
1328 if (cmd.chanlist) {
1329 chanlist =
1330 kmalloc(cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1331 if (!chanlist) {
1332 DPRINTK("allocation failed\n");
1333 ret = -ENOMEM;
1334 goto cleanup;
1335 }
1336
1337 if (copy_from_user(chanlist, user_chanlist,
1338 cmd.chanlist_len * sizeof(int))) {
1339 DPRINTK("fault reading chanlist\n");
1340 ret = -EFAULT;
1341 goto cleanup;
1342 }
1343
1344 /* make sure each element in channel/gain list is valid */
1345 ret = comedi_check_chanlist(s, cmd.chanlist_len, chanlist);
1346 if (ret < 0) {
1347 DPRINTK("bad chanlist\n");
1348 goto cleanup;
1349 }
1350
1351 cmd.chanlist = chanlist;
1352 }
1353
1354 ret = s->do_cmdtest(dev, s, &cmd);
1355
1356 /* restore chanlist pointer before copying back */
1357 cmd.chanlist = (unsigned int __force *)user_chanlist;
1358
1359 if (copy_to_user(arg, &cmd, sizeof(struct comedi_cmd))) {
1360 DPRINTK("bad cmd address\n");
1361 ret = -EFAULT;
1362 goto cleanup;
1363 }
1364 cleanup:
1365 kfree(chanlist);
1366
1367 return ret;
1368 }
1369
1370 /*
1371 COMEDI_LOCK
1372 lock subdevice
1373
1374 arg:
1375 subdevice number
1376
1377 reads:
1378 none
1379
1380 writes:
1381 none
1382
1383 */
1384
1385 static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
1386 void *file)
1387 {
1388 int ret = 0;
1389 unsigned long flags;
1390 struct comedi_subdevice *s;
1391
1392 if (arg >= dev->n_subdevices)
1393 return -EINVAL;
1394 s = &dev->subdevices[arg];
1395
1396 spin_lock_irqsave(&s->spin_lock, flags);
1397 if (s->busy || s->lock)
1398 ret = -EBUSY;
1399 else
1400 s->lock = file;
1401 spin_unlock_irqrestore(&s->spin_lock, flags);
1402
1403 #if 0
1404 if (ret < 0)
1405 return ret;
1406
1407 if (s->lock_f)
1408 ret = s->lock_f(dev, s);
1409 #endif
1410
1411 return ret;
1412 }
1413
1414 /*
1415 COMEDI_UNLOCK
1416 unlock subdevice
1417
1418 arg:
1419 subdevice number
1420
1421 reads:
1422 none
1423
1424 writes:
1425 none
1426
1427 This function isn't protected by the semaphore, since
1428 we already own the lock.
1429 */
1430 static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
1431 void *file)
1432 {
1433 struct comedi_subdevice *s;
1434
1435 if (arg >= dev->n_subdevices)
1436 return -EINVAL;
1437 s = &dev->subdevices[arg];
1438
1439 if (s->busy)
1440 return -EBUSY;
1441
1442 if (s->lock && s->lock != file)
1443 return -EACCES;
1444
1445 if (s->lock == file) {
1446 #if 0
1447 if (s->unlock)
1448 s->unlock(dev, s);
1449 #endif
1450
1451 s->lock = NULL;
1452 }
1453
1454 return 0;
1455 }
1456
1457 /*
1458 COMEDI_CANCEL
1459 cancel acquisition ioctl
1460
1461 arg:
1462 subdevice number
1463
1464 reads:
1465 nothing
1466
1467 writes:
1468 nothing
1469
1470 */
1471 static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
1472 void *file)
1473 {
1474 struct comedi_subdevice *s;
1475
1476 if (arg >= dev->n_subdevices)
1477 return -EINVAL;
1478 s = &dev->subdevices[arg];
1479 if (s->async == NULL)
1480 return -EINVAL;
1481
1482 if (s->lock && s->lock != file)
1483 return -EACCES;
1484
1485 if (!s->busy)
1486 return 0;
1487
1488 if (s->busy != file)
1489 return -EBUSY;
1490
1491 return do_cancel(dev, s);
1492 }
1493
1494 /*
1495 COMEDI_POLL ioctl
1496 instructs driver to synchronize buffers
1497
1498 arg:
1499 subdevice number
1500
1501 reads:
1502 nothing
1503
1504 writes:
1505 nothing
1506
1507 */
1508 static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg,
1509 void *file)
1510 {
1511 struct comedi_subdevice *s;
1512
1513 if (arg >= dev->n_subdevices)
1514 return -EINVAL;
1515 s = &dev->subdevices[arg];
1516
1517 if (s->lock && s->lock != file)
1518 return -EACCES;
1519
1520 if (!s->busy)
1521 return 0;
1522
1523 if (s->busy != file)
1524 return -EBUSY;
1525
1526 if (s->poll)
1527 return s->poll(dev, s);
1528
1529 return -EINVAL;
1530 }
1531
1532 static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
1533 unsigned long arg)
1534 {
1535 const unsigned minor = iminor(file->f_dentry->d_inode);
1536 struct comedi_device_file_info *dev_file_info =
1537 comedi_get_device_file_info(minor);
1538 struct comedi_device *dev;
1539 int rc;
1540
1541 if (dev_file_info == NULL || dev_file_info->device == NULL)
1542 return -ENODEV;
1543 dev = dev_file_info->device;
1544
1545 mutex_lock(&dev->mutex);
1546
1547 /* Device config is special, because it must work on
1548 * an unconfigured device. */
1549 if (cmd == COMEDI_DEVCONFIG) {
1550 rc = do_devconfig_ioctl(dev,
1551 (struct comedi_devconfig __user *)arg);
1552 if (rc == 0)
1553 /* Evade comedi_auto_unconfig(). */
1554 dev_file_info->hardware_device = NULL;
1555 goto done;
1556 }
1557
1558 if (!dev->attached) {
1559 DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor);
1560 rc = -ENODEV;
1561 goto done;
1562 }
1563
1564 switch (cmd) {
1565 case COMEDI_BUFCONFIG:
1566 rc = do_bufconfig_ioctl(dev,
1567 (struct comedi_bufconfig __user *)arg);
1568 break;
1569 case COMEDI_DEVINFO:
1570 rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg,
1571 file);
1572 break;
1573 case COMEDI_SUBDINFO:
1574 rc = do_subdinfo_ioctl(dev,
1575 (struct comedi_subdinfo __user *)arg,
1576 file);
1577 break;
1578 case COMEDI_CHANINFO:
1579 rc = do_chaninfo_ioctl(dev, (void __user *)arg);
1580 break;
1581 case COMEDI_RANGEINFO:
1582 rc = do_rangeinfo_ioctl(dev, (void __user *)arg);
1583 break;
1584 case COMEDI_BUFINFO:
1585 rc = do_bufinfo_ioctl(dev,
1586 (struct comedi_bufinfo __user *)arg,
1587 file);
1588 break;
1589 case COMEDI_LOCK:
1590 rc = do_lock_ioctl(dev, arg, file);
1591 break;
1592 case COMEDI_UNLOCK:
1593 rc = do_unlock_ioctl(dev, arg, file);
1594 break;
1595 case COMEDI_CANCEL:
1596 rc = do_cancel_ioctl(dev, arg, file);
1597 break;
1598 case COMEDI_CMD:
1599 rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file);
1600 break;
1601 case COMEDI_CMDTEST:
1602 rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg,
1603 file);
1604 break;
1605 case COMEDI_INSNLIST:
1606 rc = do_insnlist_ioctl(dev,
1607 (struct comedi_insnlist __user *)arg,
1608 file);
1609 break;
1610 case COMEDI_INSN:
1611 rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg,
1612 file);
1613 break;
1614 case COMEDI_POLL:
1615 rc = do_poll_ioctl(dev, arg, file);
1616 break;
1617 default:
1618 rc = -ENOTTY;
1619 break;
1620 }
1621
1622 done:
1623 mutex_unlock(&dev->mutex);
1624 return rc;
1625 }
1626
1627 static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
1628 {
1629 int ret = 0;
1630
1631 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel)
1632 ret = s->cancel(dev, s);
1633
1634 do_become_nonbusy(dev, s);
1635
1636 return ret;
1637 }
1638
1639
1640 static void comedi_vm_open(struct vm_area_struct *area)
1641 {
1642 struct comedi_async *async;
1643 struct comedi_device *dev;
1644
1645 async = area->vm_private_data;
1646 dev = async->subdevice->device;
1647
1648 mutex_lock(&dev->mutex);
1649 async->mmap_count++;
1650 mutex_unlock(&dev->mutex);
1651 }
1652
1653 static void comedi_vm_close(struct vm_area_struct *area)
1654 {
1655 struct comedi_async *async;
1656 struct comedi_device *dev;
1657
1658 async = area->vm_private_data;
1659 dev = async->subdevice->device;
1660
1661 mutex_lock(&dev->mutex);
1662 async->mmap_count--;
1663 mutex_unlock(&dev->mutex);
1664 }
1665
1666 static struct vm_operations_struct comedi_vm_ops = {
1667 .open = comedi_vm_open,
1668 .close = comedi_vm_close,
1669 };
1670
1671 static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
1672 {
1673 const unsigned minor = iminor(file->f_dentry->d_inode);
1674 struct comedi_async *async = NULL;
1675 unsigned long start = vma->vm_start;
1676 unsigned long size;
1677 int n_pages;
1678 int i;
1679 int retval;
1680 struct comedi_subdevice *s;
1681 struct comedi_device_file_info *dev_file_info;
1682 struct comedi_device *dev;
1683
1684 dev_file_info = comedi_get_device_file_info(minor);
1685 if (dev_file_info == NULL)
1686 return -ENODEV;
1687 dev = dev_file_info->device;
1688 if (dev == NULL)
1689 return -ENODEV;
1690
1691 mutex_lock(&dev->mutex);
1692 if (!dev->attached) {
1693 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1694 retval = -ENODEV;
1695 goto done;
1696 }
1697 if (vma->vm_flags & VM_WRITE)
1698 s = comedi_get_write_subdevice(dev_file_info);
1699 else
1700 s = comedi_get_read_subdevice(dev_file_info);
1701
1702 if (s == NULL) {
1703 retval = -EINVAL;
1704 goto done;
1705 }
1706 async = s->async;
1707 if (async == NULL) {
1708 retval = -EINVAL;
1709 goto done;
1710 }
1711
1712 if (vma->vm_pgoff != 0) {
1713 DPRINTK("comedi: mmap() offset must be 0.\n");
1714 retval = -EINVAL;
1715 goto done;
1716 }
1717
1718 size = vma->vm_end - vma->vm_start;
1719 if (size > async->prealloc_bufsz) {
1720 retval = -EFAULT;
1721 goto done;
1722 }
1723 if (size & (~PAGE_MASK)) {
1724 retval = -EFAULT;
1725 goto done;
1726 }
1727
1728 n_pages = size >> PAGE_SHIFT;
1729 for (i = 0; i < n_pages; ++i) {
1730 if (remap_pfn_range(vma, start,
1731 page_to_pfn(virt_to_page
1732 (async->buf_page_list
1733 [i].virt_addr)), PAGE_SIZE,
1734 PAGE_SHARED)) {
1735 retval = -EAGAIN;
1736 goto done;
1737 }
1738 start += PAGE_SIZE;
1739 }
1740
1741 vma->vm_ops = &comedi_vm_ops;
1742 vma->vm_private_data = async;
1743
1744 async->mmap_count++;
1745
1746 retval = 0;
1747 done:
1748 mutex_unlock(&dev->mutex);
1749 return retval;
1750 }
1751
1752 static unsigned int comedi_poll(struct file *file, poll_table *wait)
1753 {
1754 unsigned int mask = 0;
1755 const unsigned minor = iminor(file->f_dentry->d_inode);
1756 struct comedi_subdevice *read_subdev;
1757 struct comedi_subdevice *write_subdev;
1758 struct comedi_device_file_info *dev_file_info;
1759 struct comedi_device *dev;
1760 dev_file_info = comedi_get_device_file_info(minor);
1761
1762 if (dev_file_info == NULL)
1763 return -ENODEV;
1764 dev = dev_file_info->device;
1765 if (dev == NULL)
1766 return -ENODEV;
1767
1768 mutex_lock(&dev->mutex);
1769 if (!dev->attached) {
1770 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1771 mutex_unlock(&dev->mutex);
1772 return 0;
1773 }
1774
1775 mask = 0;
1776 read_subdev = comedi_get_read_subdevice(dev_file_info);
1777 if (read_subdev) {
1778 poll_wait(file, &read_subdev->async->wait_head, wait);
1779 if (!read_subdev->busy
1780 || comedi_buf_read_n_available(read_subdev->async) > 0
1781 || !(comedi_get_subdevice_runflags(read_subdev) &
1782 SRF_RUNNING)) {
1783 mask |= POLLIN | POLLRDNORM;
1784 }
1785 }
1786 write_subdev = comedi_get_write_subdevice(dev_file_info);
1787 if (write_subdev) {
1788 poll_wait(file, &write_subdev->async->wait_head, wait);
1789 comedi_buf_write_alloc(write_subdev->async,
1790 write_subdev->async->prealloc_bufsz);
1791 if (!write_subdev->busy
1792 || !(comedi_get_subdevice_runflags(write_subdev) &
1793 SRF_RUNNING)
1794 || comedi_buf_write_n_allocated(write_subdev->async) >=
1795 bytes_per_sample(write_subdev->async->subdevice)) {
1796 mask |= POLLOUT | POLLWRNORM;
1797 }
1798 }
1799
1800 mutex_unlock(&dev->mutex);
1801 return mask;
1802 }
1803
1804 static ssize_t comedi_write(struct file *file, const char __user *buf,
1805 size_t nbytes, loff_t *offset)
1806 {
1807 struct comedi_subdevice *s;
1808 struct comedi_async *async;
1809 int n, m, count = 0, retval = 0;
1810 DECLARE_WAITQUEUE(wait, current);
1811 const unsigned minor = iminor(file->f_dentry->d_inode);
1812 struct comedi_device_file_info *dev_file_info;
1813 struct comedi_device *dev;
1814 dev_file_info = comedi_get_device_file_info(minor);
1815
1816 if (dev_file_info == NULL)
1817 return -ENODEV;
1818 dev = dev_file_info->device;
1819 if (dev == NULL)
1820 return -ENODEV;
1821
1822 if (!dev->attached) {
1823 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1824 retval = -ENODEV;
1825 goto done;
1826 }
1827
1828 s = comedi_get_write_subdevice(dev_file_info);
1829 if (s == NULL) {
1830 retval = -EIO;
1831 goto done;
1832 }
1833 async = s->async;
1834
1835 if (!nbytes) {
1836 retval = 0;
1837 goto done;
1838 }
1839 if (!s->busy) {
1840 retval = 0;
1841 goto done;
1842 }
1843 if (s->busy != file) {
1844 retval = -EACCES;
1845 goto done;
1846 }
1847 add_wait_queue(&async->wait_head, &wait);
1848 while (nbytes > 0 && !retval) {
1849 set_current_state(TASK_INTERRUPTIBLE);
1850
1851 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1852 if (count == 0) {
1853 if (comedi_get_subdevice_runflags(s) &
1854 SRF_ERROR) {
1855 retval = -EPIPE;
1856 } else {
1857 retval = 0;
1858 }
1859 do_become_nonbusy(dev, s);
1860 }
1861 break;
1862 }
1863
1864 n = nbytes;
1865
1866 m = n;
1867 if (async->buf_write_ptr + m > async->prealloc_bufsz)
1868 m = async->prealloc_bufsz - async->buf_write_ptr;
1869 comedi_buf_write_alloc(async, async->prealloc_bufsz);
1870 if (m > comedi_buf_write_n_allocated(async))
1871 m = comedi_buf_write_n_allocated(async);
1872 if (m < n)
1873 n = m;
1874
1875 if (n == 0) {
1876 if (file->f_flags & O_NONBLOCK) {
1877 retval = -EAGAIN;
1878 break;
1879 }
1880 schedule();
1881 if (signal_pending(current)) {
1882 retval = -ERESTARTSYS;
1883 break;
1884 }
1885 if (!s->busy)
1886 break;
1887 if (s->busy != file) {
1888 retval = -EACCES;
1889 break;
1890 }
1891 continue;
1892 }
1893
1894 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr,
1895 buf, n);
1896 if (m) {
1897 n -= m;
1898 retval = -EFAULT;
1899 }
1900 comedi_buf_write_free(async, n);
1901
1902 count += n;
1903 nbytes -= n;
1904
1905 buf += n;
1906 break; /* makes device work like a pipe */
1907 }
1908 set_current_state(TASK_RUNNING);
1909 remove_wait_queue(&async->wait_head, &wait);
1910
1911 done:
1912 return count ? count : retval;
1913 }
1914
1915 static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
1916 loff_t *offset)
1917 {
1918 struct comedi_subdevice *s;
1919 struct comedi_async *async;
1920 int n, m, count = 0, retval = 0;
1921 DECLARE_WAITQUEUE(wait, current);
1922 const unsigned minor = iminor(file->f_dentry->d_inode);
1923 struct comedi_device_file_info *dev_file_info;
1924 struct comedi_device *dev;
1925 dev_file_info = comedi_get_device_file_info(minor);
1926
1927 if (dev_file_info == NULL)
1928 return -ENODEV;
1929 dev = dev_file_info->device;
1930 if (dev == NULL)
1931 return -ENODEV;
1932
1933 if (!dev->attached) {
1934 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1935 retval = -ENODEV;
1936 goto done;
1937 }
1938
1939 s = comedi_get_read_subdevice(dev_file_info);
1940 if (s == NULL) {
1941 retval = -EIO;
1942 goto done;
1943 }
1944 async = s->async;
1945 if (!nbytes) {
1946 retval = 0;
1947 goto done;
1948 }
1949 if (!s->busy) {
1950 retval = 0;
1951 goto done;
1952 }
1953 if (s->busy != file) {
1954 retval = -EACCES;
1955 goto done;
1956 }
1957
1958 add_wait_queue(&async->wait_head, &wait);
1959 while (nbytes > 0 && !retval) {
1960 set_current_state(TASK_INTERRUPTIBLE);
1961
1962 n = nbytes;
1963
1964 m = comedi_buf_read_n_available(async);
1965 /* printk("%d available\n",m); */
1966 if (async->buf_read_ptr + m > async->prealloc_bufsz)
1967 m = async->prealloc_bufsz - async->buf_read_ptr;
1968 /* printk("%d contiguous\n",m); */
1969 if (m < n)
1970 n = m;
1971
1972 if (n == 0) {
1973 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1974 do_become_nonbusy(dev, s);
1975 if (comedi_get_subdevice_runflags(s) &
1976 SRF_ERROR) {
1977 retval = -EPIPE;
1978 } else {
1979 retval = 0;
1980 }
1981 break;
1982 }
1983 if (file->f_flags & O_NONBLOCK) {
1984 retval = -EAGAIN;
1985 break;
1986 }
1987 schedule();
1988 if (signal_pending(current)) {
1989 retval = -ERESTARTSYS;
1990 break;
1991 }
1992 if (!s->busy) {
1993 retval = 0;
1994 break;
1995 }
1996 if (s->busy != file) {
1997 retval = -EACCES;
1998 break;
1999 }
2000 continue;
2001 }
2002 m = copy_to_user(buf, async->prealloc_buf +
2003 async->buf_read_ptr, n);
2004 if (m) {
2005 n -= m;
2006 retval = -EFAULT;
2007 }
2008
2009 comedi_buf_read_alloc(async, n);
2010 comedi_buf_read_free(async, n);
2011
2012 count += n;
2013 nbytes -= n;
2014
2015 buf += n;
2016 break; /* makes device work like a pipe */
2017 }
2018 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) &&
2019 async->buf_read_count - async->buf_write_count == 0) {
2020 do_become_nonbusy(dev, s);
2021 }
2022 set_current_state(TASK_RUNNING);
2023 remove_wait_queue(&async->wait_head, &wait);
2024
2025 done:
2026 return count ? count : retval;
2027 }
2028
2029 /*
2030 This function restores a subdevice to an idle state.
2031 */
2032 static void do_become_nonbusy(struct comedi_device *dev,
2033 struct comedi_subdevice *s)
2034 {
2035 struct comedi_async *async = s->async;
2036
2037 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
2038 if (async) {
2039 comedi_reset_async_buf(async);
2040 async->inttrig = NULL;
2041 kfree(async->cmd.chanlist);
2042 async->cmd.chanlist = NULL;
2043 } else {
2044 dev_err(dev->class_dev,
2045 "BUG: (?) do_become_nonbusy called with async=NULL\n");
2046 }
2047
2048 s->busy = NULL;
2049 }
2050
2051 static int comedi_open(struct inode *inode, struct file *file)
2052 {
2053 const unsigned minor = iminor(inode);
2054 struct comedi_device_file_info *dev_file_info =
2055 comedi_get_device_file_info(minor);
2056 struct comedi_device *dev =
2057 dev_file_info ? dev_file_info->device : NULL;
2058
2059 if (dev == NULL) {
2060 DPRINTK("invalid minor number\n");
2061 return -ENODEV;
2062 }
2063
2064 /* This is slightly hacky, but we want module autoloading
2065 * to work for root.
2066 * case: user opens device, attached -> ok
2067 * case: user opens device, unattached, in_request_module=0 -> autoload
2068 * case: user opens device, unattached, in_request_module=1 -> fail
2069 * case: root opens device, attached -> ok
2070 * case: root opens device, unattached, in_request_module=1 -> ok
2071 * (typically called from modprobe)
2072 * case: root opens device, unattached, in_request_module=0 -> autoload
2073 *
2074 * The last could be changed to "-> ok", which would deny root
2075 * autoloading.
2076 */
2077 mutex_lock(&dev->mutex);
2078 if (dev->attached)
2079 goto ok;
2080 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) {
2081 DPRINTK("in request module\n");
2082 mutex_unlock(&dev->mutex);
2083 return -ENODEV;
2084 }
2085 if (capable(CAP_NET_ADMIN) && dev->in_request_module)
2086 goto ok;
2087
2088 dev->in_request_module = 1;
2089
2090 #ifdef CONFIG_KMOD
2091 mutex_unlock(&dev->mutex);
2092 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor);
2093 mutex_lock(&dev->mutex);
2094 #endif
2095
2096 dev->in_request_module = 0;
2097
2098 if (!dev->attached && !capable(CAP_NET_ADMIN)) {
2099 DPRINTK("not attached and not CAP_NET_ADMIN\n");
2100 mutex_unlock(&dev->mutex);
2101 return -ENODEV;
2102 }
2103 ok:
2104 __module_get(THIS_MODULE);
2105
2106 if (dev->attached) {
2107 if (!try_module_get(dev->driver->module)) {
2108 module_put(THIS_MODULE);
2109 mutex_unlock(&dev->mutex);
2110 return -ENOSYS;
2111 }
2112 }
2113
2114 if (dev->attached && dev->use_count == 0 && dev->open) {
2115 int rc = dev->open(dev);
2116 if (rc < 0) {
2117 module_put(dev->driver->module);
2118 module_put(THIS_MODULE);
2119 mutex_unlock(&dev->mutex);
2120 return rc;
2121 }
2122 }
2123
2124 dev->use_count++;
2125
2126 mutex_unlock(&dev->mutex);
2127
2128 return 0;
2129 }
2130
2131 static int comedi_close(struct inode *inode, struct file *file)
2132 {
2133 const unsigned minor = iminor(inode);
2134 struct comedi_subdevice *s = NULL;
2135 int i;
2136 struct comedi_device_file_info *dev_file_info;
2137 struct comedi_device *dev;
2138 dev_file_info = comedi_get_device_file_info(minor);
2139
2140 if (dev_file_info == NULL)
2141 return -ENODEV;
2142 dev = dev_file_info->device;
2143 if (dev == NULL)
2144 return -ENODEV;
2145
2146 mutex_lock(&dev->mutex);
2147
2148 if (dev->subdevices) {
2149 for (i = 0; i < dev->n_subdevices; i++) {
2150 s = &dev->subdevices[i];
2151
2152 if (s->busy == file)
2153 do_cancel(dev, s);
2154 if (s->lock == file)
2155 s->lock = NULL;
2156 }
2157 }
2158 if (dev->attached && dev->use_count == 1 && dev->close)
2159 dev->close(dev);
2160
2161 module_put(THIS_MODULE);
2162 if (dev->attached)
2163 module_put(dev->driver->module);
2164
2165 dev->use_count--;
2166
2167 mutex_unlock(&dev->mutex);
2168
2169 if (file->f_flags & FASYNC)
2170 comedi_fasync(-1, file, 0);
2171
2172 return 0;
2173 }
2174
2175 static int comedi_fasync(int fd, struct file *file, int on)
2176 {
2177 const unsigned minor = iminor(file->f_dentry->d_inode);
2178 struct comedi_device_file_info *dev_file_info;
2179 struct comedi_device *dev;
2180 dev_file_info = comedi_get_device_file_info(minor);
2181
2182 if (dev_file_info == NULL)
2183 return -ENODEV;
2184 dev = dev_file_info->device;
2185 if (dev == NULL)
2186 return -ENODEV;
2187
2188 return fasync_helper(fd, file, on, &dev->async_queue);
2189 }
2190
2191 static const struct file_operations comedi_fops = {
2192 .owner = THIS_MODULE,
2193 .unlocked_ioctl = comedi_unlocked_ioctl,
2194 .compat_ioctl = comedi_compat_ioctl,
2195 .open = comedi_open,
2196 .release = comedi_close,
2197 .read = comedi_read,
2198 .write = comedi_write,
2199 .mmap = comedi_mmap,
2200 .poll = comedi_poll,
2201 .fasync = comedi_fasync,
2202 .llseek = noop_llseek,
2203 };
2204
2205 static struct class *comedi_class;
2206 static struct cdev comedi_cdev;
2207
2208 static void comedi_cleanup_legacy_minors(void)
2209 {
2210 unsigned i;
2211
2212 for (i = 0; i < comedi_num_legacy_minors; i++)
2213 comedi_free_board_minor(i);
2214 }
2215
2216 static int __init comedi_init(void)
2217 {
2218 int i;
2219 int retval;
2220
2221 pr_info("comedi: version " COMEDI_RELEASE " - http://www.comedi.org\n");
2222
2223 if (comedi_num_legacy_minors < 0 ||
2224 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
2225 pr_err("comedi: error: invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n",
2226 COMEDI_NUM_BOARD_MINORS);
2227 return -EINVAL;
2228 }
2229
2230 /*
2231 * comedi is unusable if both comedi_autoconfig and
2232 * comedi_num_legacy_minors are zero, so we might as well adjust the
2233 * defaults in that case
2234 */
2235 if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0)
2236 comedi_num_legacy_minors = 16;
2237
2238 memset(comedi_file_info_table, 0,
2239 sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS);
2240
2241 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2242 COMEDI_NUM_MINORS, "comedi");
2243 if (retval)
2244 return -EIO;
2245 cdev_init(&comedi_cdev, &comedi_fops);
2246 comedi_cdev.owner = THIS_MODULE;
2247 kobject_set_name(&comedi_cdev.kobj, "comedi");
2248 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
2249 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2250 COMEDI_NUM_MINORS);
2251 return -EIO;
2252 }
2253 comedi_class = class_create(THIS_MODULE, "comedi");
2254 if (IS_ERR(comedi_class)) {
2255 pr_err("comedi: failed to create class\n");
2256 cdev_del(&comedi_cdev);
2257 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2258 COMEDI_NUM_MINORS);
2259 return PTR_ERR(comedi_class);
2260 }
2261
2262 comedi_class->dev_attrs = comedi_dev_attrs;
2263
2264 /* XXX requires /proc interface */
2265 comedi_proc_init();
2266
2267 /* create devices files for legacy/manual use */
2268 for (i = 0; i < comedi_num_legacy_minors; i++) {
2269 int minor;
2270 minor = comedi_alloc_board_minor(NULL);
2271 if (minor < 0) {
2272 comedi_cleanup_legacy_minors();
2273 cdev_del(&comedi_cdev);
2274 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2275 COMEDI_NUM_MINORS);
2276 return minor;
2277 }
2278 }
2279
2280 return 0;
2281 }
2282
2283 static void __exit comedi_cleanup(void)
2284 {
2285 int i;
2286
2287 comedi_cleanup_legacy_minors();
2288 for (i = 0; i < COMEDI_NUM_MINORS; ++i)
2289 BUG_ON(comedi_file_info_table[i]);
2290
2291 class_destroy(comedi_class);
2292 cdev_del(&comedi_cdev);
2293 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
2294
2295 comedi_proc_cleanup();
2296 }
2297
2298 module_init(comedi_init);
2299 module_exit(comedi_cleanup);
2300
2301 void comedi_error(const struct comedi_device *dev, const char *s)
2302 {
2303 dev_err(dev->class_dev, "%s: %s\n", dev->driver->driver_name, s);
2304 }
2305 EXPORT_SYMBOL(comedi_error);
2306
2307 void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
2308 {
2309 struct comedi_async *async = s->async;
2310 unsigned runflags = 0;
2311 unsigned runflags_mask = 0;
2312
2313 /* DPRINTK("comedi_event 0x%x\n",mask); */
2314
2315 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0)
2316 return;
2317
2318 if (s->
2319 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR |
2320 COMEDI_CB_OVERFLOW)) {
2321 runflags_mask |= SRF_RUNNING;
2322 }
2323 /* remember if an error event has occurred, so an error
2324 * can be returned the next time the user does a read() */
2325 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
2326 runflags_mask |= SRF_ERROR;
2327 runflags |= SRF_ERROR;
2328 }
2329 if (runflags_mask) {
2330 /*sets SRF_ERROR and SRF_RUNNING together atomically */
2331 comedi_set_subdevice_runflags(s, runflags_mask, runflags);
2332 }
2333
2334 if (async->cb_mask & s->async->events) {
2335 if (comedi_get_subdevice_runflags(s) & SRF_USER) {
2336 wake_up_interruptible(&async->wait_head);
2337 if (s->subdev_flags & SDF_CMD_READ)
2338 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
2339 if (s->subdev_flags & SDF_CMD_WRITE)
2340 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT);
2341 } else {
2342 if (async->cb_func)
2343 async->cb_func(s->async->events, async->cb_arg);
2344 }
2345 }
2346 s->async->events = 0;
2347 }
2348 EXPORT_SYMBOL(comedi_event);
2349
2350 unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s)
2351 {
2352 unsigned long flags;
2353 unsigned runflags;
2354
2355 spin_lock_irqsave(&s->spin_lock, flags);
2356 runflags = s->runflags;
2357 spin_unlock_irqrestore(&s->spin_lock, flags);
2358 return runflags;
2359 }
2360 EXPORT_SYMBOL(comedi_get_subdevice_runflags);
2361
2362 static int is_device_busy(struct comedi_device *dev)
2363 {
2364 struct comedi_subdevice *s;
2365 int i;
2366
2367 if (!dev->attached)
2368 return 0;
2369
2370 for (i = 0; i < dev->n_subdevices; i++) {
2371 s = &dev->subdevices[i];
2372 if (s->busy)
2373 return 1;
2374 if (s->async && s->async->mmap_count)
2375 return 1;
2376 }
2377
2378 return 0;
2379 }
2380
2381 static void comedi_device_init(struct comedi_device *dev)
2382 {
2383 memset(dev, 0, sizeof(struct comedi_device));
2384 spin_lock_init(&dev->spinlock);
2385 mutex_init(&dev->mutex);
2386 dev->minor = -1;
2387 }
2388
2389 static void comedi_device_cleanup(struct comedi_device *dev)
2390 {
2391 if (dev == NULL)
2392 return;
2393 mutex_lock(&dev->mutex);
2394 comedi_device_detach(dev);
2395 mutex_unlock(&dev->mutex);
2396 mutex_destroy(&dev->mutex);
2397 }
2398
2399 int comedi_alloc_board_minor(struct device *hardware_device)
2400 {
2401 struct comedi_device_file_info *info;
2402 struct device *csdev;
2403 unsigned i;
2404
2405 info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
2406 if (info == NULL)
2407 return -ENOMEM;
2408 info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL);
2409 if (info->device == NULL) {
2410 kfree(info);
2411 return -ENOMEM;
2412 }
2413 info->hardware_device = hardware_device;
2414 comedi_device_init(info->device);
2415 spin_lock(&comedi_file_info_table_lock);
2416 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) {
2417 if (comedi_file_info_table[i] == NULL) {
2418 comedi_file_info_table[i] = info;
2419 break;
2420 }
2421 }
2422 spin_unlock(&comedi_file_info_table_lock);
2423 if (i == COMEDI_NUM_BOARD_MINORS) {
2424 comedi_device_cleanup(info->device);
2425 kfree(info->device);
2426 kfree(info);
2427 pr_err("comedi: error: ran out of minor numbers for board device files.\n");
2428 return -EBUSY;
2429 }
2430 info->device->minor = i;
2431 csdev = device_create(comedi_class, hardware_device,
2432 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i);
2433 if (!IS_ERR(csdev))
2434 info->device->class_dev = csdev;
2435 dev_set_drvdata(csdev, info);
2436
2437 return i;
2438 }
2439
2440 void comedi_free_board_minor(unsigned minor)
2441 {
2442 struct comedi_device_file_info *info;
2443
2444 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
2445 spin_lock(&comedi_file_info_table_lock);
2446 info = comedi_file_info_table[minor];
2447 comedi_file_info_table[minor] = NULL;
2448 spin_unlock(&comedi_file_info_table_lock);
2449
2450 if (info) {
2451 struct comedi_device *dev = info->device;
2452 if (dev) {
2453 if (dev->class_dev) {
2454 device_destroy(comedi_class,
2455 MKDEV(COMEDI_MAJOR, dev->minor));
2456 }
2457 comedi_device_cleanup(dev);
2458 kfree(dev);
2459 }
2460 kfree(info);
2461 }
2462 }
2463
2464 int comedi_find_board_minor(struct device *hardware_device)
2465 {
2466 int minor;
2467 struct comedi_device_file_info *info;
2468
2469 for (minor = 0; minor < COMEDI_NUM_BOARD_MINORS; minor++) {
2470 spin_lock(&comedi_file_info_table_lock);
2471 info = comedi_file_info_table[minor];
2472 if (info && info->hardware_device == hardware_device) {
2473 spin_unlock(&comedi_file_info_table_lock);
2474 return minor;
2475 }
2476 spin_unlock(&comedi_file_info_table_lock);
2477 }
2478 return -ENODEV;
2479 }
2480
2481 int comedi_alloc_subdevice_minor(struct comedi_device *dev,
2482 struct comedi_subdevice *s)
2483 {
2484 struct comedi_device_file_info *info;
2485 struct device *csdev;
2486 unsigned i;
2487
2488 info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
2489 if (info == NULL)
2490 return -ENOMEM;
2491 info->device = dev;
2492 info->read_subdevice = s;
2493 info->write_subdevice = s;
2494 spin_lock(&comedi_file_info_table_lock);
2495 for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) {
2496 if (comedi_file_info_table[i] == NULL) {
2497 comedi_file_info_table[i] = info;
2498 break;
2499 }
2500 }
2501 spin_unlock(&comedi_file_info_table_lock);
2502 if (i == COMEDI_NUM_MINORS) {
2503 kfree(info);
2504 pr_err("comedi: error: ran out of minor numbers for board device files.\n");
2505 return -EBUSY;
2506 }
2507 s->minor = i;
2508 csdev = device_create(comedi_class, dev->class_dev,
2509 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i",
2510 dev->minor, (int)(s - dev->subdevices));
2511 if (!IS_ERR(csdev))
2512 s->class_dev = csdev;
2513 dev_set_drvdata(csdev, info);
2514
2515 return i;
2516 }
2517
2518 void comedi_free_subdevice_minor(struct comedi_subdevice *s)
2519 {
2520 struct comedi_device_file_info *info;
2521
2522 if (s == NULL)
2523 return;
2524 if (s->minor < 0)
2525 return;
2526
2527 BUG_ON(s->minor >= COMEDI_NUM_MINORS);
2528 BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR);
2529
2530 spin_lock(&comedi_file_info_table_lock);
2531 info = comedi_file_info_table[s->minor];
2532 comedi_file_info_table[s->minor] = NULL;
2533 spin_unlock(&comedi_file_info_table_lock);
2534
2535 if (s->class_dev) {
2536 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
2537 s->class_dev = NULL;
2538 }
2539 kfree(info);
2540 }
2541
2542 struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor)
2543 {
2544 struct comedi_device_file_info *info;
2545
2546 BUG_ON(minor >= COMEDI_NUM_MINORS);
2547 spin_lock(&comedi_file_info_table_lock);
2548 info = comedi_file_info_table[minor];
2549 spin_unlock(&comedi_file_info_table_lock);
2550 return info;
2551 }
2552 EXPORT_SYMBOL_GPL(comedi_get_device_file_info);
Linux kernel - Deliverables
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