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Merge branch 'next/drivers' into HEAD
[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 #define __NO_VERSION__
27 #include "comedi_compat32.h"
28
29 #include <linux/module.h>
30 #include <linux/errno.h>
31 #include <linux/kernel.h>
32 #include <linux/sched.h>
33 #include <linux/fcntl.h>
34 #include <linux/delay.h>
35 #include <linux/ioport.h>
36 #include <linux/mm.h>
37 #include <linux/slab.h>
38 #include <linux/kmod.h>
39 #include <linux/poll.h>
40 #include <linux/init.h>
41 #include <linux/device.h>
42 #include <linux/vmalloc.h>
43 #include <linux/fs.h>
44 #include "comedidev.h"
45 #include <linux/cdev.h>
46 #include <linux/stat.h>
47
48 #include <linux/io.h>
49 #include <linux/uaccess.h>
50
51 #include "comedi_internal.h"
52
53 MODULE_AUTHOR("http://www.comedi.org");
54 MODULE_DESCRIPTION("Comedi core module");
55 MODULE_LICENSE("GPL");
56
57 #ifdef CONFIG_COMEDI_DEBUG
58 int comedi_debug;
59 EXPORT_SYMBOL(comedi_debug);
60 module_param(comedi_debug, int, S_IRUGO | S_IWUSR);
61 MODULE_PARM_DESC(comedi_debug,
62 "enable comedi core and driver debugging if non-zero (default 0)"
63 );
64 #endif
65
66 bool comedi_autoconfig = 1;
67 module_param(comedi_autoconfig, bool, S_IRUGO);
68 MODULE_PARM_DESC(comedi_autoconfig,
69 "enable drivers to auto-configure comedi devices (default 1)");
70
71 static int comedi_num_legacy_minors;
72 module_param(comedi_num_legacy_minors, int, S_IRUGO);
73 MODULE_PARM_DESC(comedi_num_legacy_minors,
74 "number of comedi minor devices to reserve for non-auto-configured devices (default 0)"
75 );
76
77 unsigned int comedi_default_buf_size_kb = CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB;
78 module_param(comedi_default_buf_size_kb, uint, S_IRUGO | S_IWUSR);
79 MODULE_PARM_DESC(comedi_default_buf_size_kb,
80 "default asynchronous buffer size in KiB (default "
81 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_SIZE_KB) ")");
82
83 unsigned int comedi_default_buf_maxsize_kb
84 = CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB;
85 module_param(comedi_default_buf_maxsize_kb, uint, S_IRUGO | S_IWUSR);
86 MODULE_PARM_DESC(comedi_default_buf_maxsize_kb,
87 "default maximum size of asynchronous buffer in KiB (default "
88 __MODULE_STRING(CONFIG_COMEDI_DEFAULT_BUF_MAXSIZE_KB) ")");
89
90 static DEFINE_SPINLOCK(comedi_file_info_table_lock);
91 static struct comedi_device_file_info
92 *comedi_file_info_table[COMEDI_NUM_MINORS];
93
94 static void do_become_nonbusy(struct comedi_device *dev,
95 struct comedi_subdevice *s);
96 static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
97
98 static int comedi_fasync(int fd, struct file *file, int on);
99
100 static int is_device_busy(struct comedi_device *dev);
101
102 static int resize_async_buffer(struct comedi_device *dev,
103 struct comedi_subdevice *s,
104 struct comedi_async *async, unsigned new_size)
105 {
106 int retval;
107
108 if (new_size > async->max_bufsize)
109 return -EPERM;
110
111 if (s->busy) {
112 DPRINTK("subdevice is busy, cannot resize buffer\n");
113 return -EBUSY;
114 }
115 if (async->mmap_count) {
116 DPRINTK("subdevice is mmapped, cannot resize buffer\n");
117 return -EBUSY;
118 }
119
120 if (!async->prealloc_buf)
121 return -EINVAL;
122
123 /* make sure buffer is an integral number of pages
124 * (we round up) */
125 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
126
127 retval = comedi_buf_alloc(dev, s, new_size);
128 if (retval < 0)
129 return retval;
130
131 if (s->buf_change) {
132 retval = s->buf_change(dev, s, new_size);
133 if (retval < 0)
134 return retval;
135 }
136
137 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
138 dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz);
139 return 0;
140 }
141
142 /* sysfs attribute files */
143
144 static ssize_t show_max_read_buffer_kb(struct device *dev,
145 struct device_attribute *attr, char *buf)
146 {
147 struct comedi_device_file_info *info = dev_get_drvdata(dev);
148 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
149 unsigned int size = 0;
150
151 mutex_lock(&info->device->mutex);
152 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
153 size = s->async->max_bufsize / 1024;
154 mutex_unlock(&info->device->mutex);
155
156 return snprintf(buf, PAGE_SIZE, "%i\n", size);
157 }
158
159 static ssize_t store_max_read_buffer_kb(struct device *dev,
160 struct device_attribute *attr,
161 const char *buf, size_t count)
162 {
163 struct comedi_device_file_info *info = dev_get_drvdata(dev);
164 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
165 unsigned int size;
166 int err;
167
168 err = kstrtouint(buf, 10, &size);
169 if (err)
170 return err;
171 if (size > (UINT_MAX / 1024))
172 return -EINVAL;
173 size *= 1024;
174
175 mutex_lock(&info->device->mutex);
176 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
177 s->async->max_bufsize = size;
178 else
179 err = -EINVAL;
180 mutex_unlock(&info->device->mutex);
181
182 return err ? err : count;
183 }
184
185 static ssize_t show_read_buffer_kb(struct device *dev,
186 struct device_attribute *attr, char *buf)
187 {
188 struct comedi_device_file_info *info = dev_get_drvdata(dev);
189 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
190 unsigned int size = 0;
191
192 mutex_lock(&info->device->mutex);
193 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
194 size = s->async->prealloc_bufsz / 1024;
195 mutex_unlock(&info->device->mutex);
196
197 return snprintf(buf, PAGE_SIZE, "%i\n", size);
198 }
199
200 static ssize_t store_read_buffer_kb(struct device *dev,
201 struct device_attribute *attr,
202 const char *buf, size_t count)
203 {
204 struct comedi_device_file_info *info = dev_get_drvdata(dev);
205 struct comedi_subdevice *s = comedi_get_read_subdevice(info);
206 unsigned int size;
207 int err;
208
209 err = kstrtouint(buf, 10, &size);
210 if (err)
211 return err;
212 if (size > (UINT_MAX / 1024))
213 return -EINVAL;
214 size *= 1024;
215
216 mutex_lock(&info->device->mutex);
217 if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
218 err = resize_async_buffer(info->device, s, s->async, size);
219 else
220 err = -EINVAL;
221 mutex_unlock(&info->device->mutex);
222
223 return err ? err : count;
224 }
225
226 static ssize_t show_max_write_buffer_kb(struct device *dev,
227 struct device_attribute *attr,
228 char *buf)
229 {
230 struct comedi_device_file_info *info = dev_get_drvdata(dev);
231 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
232 unsigned int size = 0;
233
234 mutex_lock(&info->device->mutex);
235 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
236 size = s->async->max_bufsize / 1024;
237 mutex_unlock(&info->device->mutex);
238
239 return snprintf(buf, PAGE_SIZE, "%i\n", size);
240 }
241
242 static ssize_t store_max_write_buffer_kb(struct device *dev,
243 struct device_attribute *attr,
244 const char *buf, size_t count)
245 {
246 struct comedi_device_file_info *info = dev_get_drvdata(dev);
247 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
248 unsigned int size;
249 int err;
250
251 err = kstrtouint(buf, 10, &size);
252 if (err)
253 return err;
254 if (size > (UINT_MAX / 1024))
255 return -EINVAL;
256 size *= 1024;
257
258 mutex_lock(&info->device->mutex);
259 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
260 s->async->max_bufsize = size;
261 else
262 err = -EINVAL;
263 mutex_unlock(&info->device->mutex);
264
265 return err ? err : count;
266 }
267
268 static ssize_t show_write_buffer_kb(struct device *dev,
269 struct device_attribute *attr, char *buf)
270 {
271 struct comedi_device_file_info *info = dev_get_drvdata(dev);
272 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
273 unsigned int size = 0;
274
275 mutex_lock(&info->device->mutex);
276 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
277 size = s->async->prealloc_bufsz / 1024;
278 mutex_unlock(&info->device->mutex);
279
280 return snprintf(buf, PAGE_SIZE, "%i\n", size);
281 }
282
283 static ssize_t store_write_buffer_kb(struct device *dev,
284 struct device_attribute *attr,
285 const char *buf, size_t count)
286 {
287 struct comedi_device_file_info *info = dev_get_drvdata(dev);
288 struct comedi_subdevice *s = comedi_get_write_subdevice(info);
289 unsigned int size;
290 int err;
291
292 err = kstrtouint(buf, 10, &size);
293 if (err)
294 return err;
295 if (size > (UINT_MAX / 1024))
296 return -EINVAL;
297 size *= 1024;
298
299 mutex_lock(&info->device->mutex);
300 if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
301 err = resize_async_buffer(info->device, s, s->async, size);
302 else
303 err = -EINVAL;
304 mutex_unlock(&info->device->mutex);
305
306 return err ? err : count;
307 }
308
309 static struct device_attribute comedi_dev_attrs[] = {
310 __ATTR(max_read_buffer_kb, S_IRUGO | S_IWUSR,
311 show_max_read_buffer_kb, store_max_read_buffer_kb),
312 __ATTR(read_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
313 show_read_buffer_kb, store_read_buffer_kb),
314 __ATTR(max_write_buffer_kb, S_IRUGO | S_IWUSR,
315 show_max_write_buffer_kb, store_max_write_buffer_kb),
316 __ATTR(write_buffer_kb, S_IRUGO | S_IWUSR | S_IWGRP,
317 show_write_buffer_kb, store_write_buffer_kb),
318 __ATTR_NULL
319 };
320
321 /*
322 COMEDI_DEVCONFIG
323 device config ioctl
324
325 arg:
326 pointer to devconfig structure
327
328 reads:
329 devconfig structure at arg
330
331 writes:
332 none
333 */
334 static int do_devconfig_ioctl(struct comedi_device *dev,
335 struct comedi_devconfig __user *arg)
336 {
337 struct comedi_devconfig it;
338 int ret;
339 unsigned char *aux_data = NULL;
340 int aux_len;
341
342 if (!capable(CAP_SYS_ADMIN))
343 return -EPERM;
344
345 if (arg == NULL) {
346 if (is_device_busy(dev))
347 return -EBUSY;
348 if (dev->attached) {
349 struct module *driver_module = dev->driver->module;
350 comedi_device_detach(dev);
351 module_put(driver_module);
352 }
353 return 0;
354 }
355
356 if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig)))
357 return -EFAULT;
358
359 it.board_name[COMEDI_NAMELEN - 1] = 0;
360
361 if (comedi_aux_data(it.options, 0) &&
362 it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
363 int bit_shift;
364 aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH];
365 if (aux_len < 0)
366 return -EFAULT;
367
368 aux_data = vmalloc(aux_len);
369 if (!aux_data)
370 return -ENOMEM;
371
372 if (copy_from_user(aux_data,
373 (unsigned char __user *
374 )comedi_aux_data(it.options, 0), aux_len)) {
375 vfree(aux_data);
376 return -EFAULT;
377 }
378 it.options[COMEDI_DEVCONF_AUX_DATA_LO] =
379 (unsigned long)aux_data;
380 if (sizeof(void *) > sizeof(int)) {
381 bit_shift = sizeof(int) * 8;
382 it.options[COMEDI_DEVCONF_AUX_DATA_HI] =
383 ((unsigned long)aux_data) >> bit_shift;
384 } else
385 it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0;
386 }
387
388 ret = comedi_device_attach(dev, &it);
389 if (ret == 0) {
390 if (!try_module_get(dev->driver->module)) {
391 comedi_device_detach(dev);
392 ret = -ENOSYS;
393 }
394 }
395
396 if (aux_data)
397 vfree(aux_data);
398
399 return ret;
400 }
401
402 /*
403 COMEDI_BUFCONFIG
404 buffer configuration ioctl
405
406 arg:
407 pointer to bufconfig structure
408
409 reads:
410 bufconfig at arg
411
412 writes:
413 modified bufconfig at arg
414
415 */
416 static int do_bufconfig_ioctl(struct comedi_device *dev,
417 struct comedi_bufconfig __user *arg)
418 {
419 struct comedi_bufconfig bc;
420 struct comedi_async *async;
421 struct comedi_subdevice *s;
422 int retval = 0;
423
424 if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig)))
425 return -EFAULT;
426
427 if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0)
428 return -EINVAL;
429
430 s = &dev->subdevices[bc.subdevice];
431 async = s->async;
432
433 if (!async) {
434 DPRINTK("subdevice does not have async capability\n");
435 bc.size = 0;
436 bc.maximum_size = 0;
437 goto copyback;
438 }
439
440 if (bc.maximum_size) {
441 if (!capable(CAP_SYS_ADMIN))
442 return -EPERM;
443
444 async->max_bufsize = bc.maximum_size;
445 }
446
447 if (bc.size) {
448 retval = resize_async_buffer(dev, s, async, bc.size);
449 if (retval < 0)
450 return retval;
451 }
452
453 bc.size = async->prealloc_bufsz;
454 bc.maximum_size = async->max_bufsize;
455
456 copyback:
457 if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig)))
458 return -EFAULT;
459
460 return 0;
461 }
462
463 /*
464 COMEDI_DEVINFO
465 device info ioctl
466
467 arg:
468 pointer to devinfo structure
469
470 reads:
471 none
472
473 writes:
474 devinfo structure
475
476 */
477 static int do_devinfo_ioctl(struct comedi_device *dev,
478 struct comedi_devinfo __user *arg,
479 struct file *file)
480 {
481 struct comedi_devinfo devinfo;
482 const unsigned minor = iminor(file->f_dentry->d_inode);
483 struct comedi_device_file_info *dev_file_info =
484 comedi_get_device_file_info(minor);
485 struct comedi_subdevice *read_subdev =
486 comedi_get_read_subdevice(dev_file_info);
487 struct comedi_subdevice *write_subdev =
488 comedi_get_write_subdevice(dev_file_info);
489
490 memset(&devinfo, 0, sizeof(devinfo));
491
492 /* fill devinfo structure */
493 devinfo.version_code = COMEDI_VERSION_CODE;
494 devinfo.n_subdevs = dev->n_subdevices;
495 strlcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
496 strlcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
497
498 if (read_subdev)
499 devinfo.read_subdevice = read_subdev - dev->subdevices;
500 else
501 devinfo.read_subdevice = -1;
502
503 if (write_subdev)
504 devinfo.write_subdevice = write_subdev - dev->subdevices;
505 else
506 devinfo.write_subdevice = -1;
507
508 if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo)))
509 return -EFAULT;
510
511 return 0;
512 }
513
514 /*
515 COMEDI_SUBDINFO
516 subdevice info ioctl
517
518 arg:
519 pointer to array of subdevice info structures
520
521 reads:
522 none
523
524 writes:
525 array of subdevice info structures at arg
526
527 */
528 static int do_subdinfo_ioctl(struct comedi_device *dev,
529 struct comedi_subdinfo __user *arg, void *file)
530 {
531 int ret, i;
532 struct comedi_subdinfo *tmp, *us;
533 struct comedi_subdevice *s;
534
535 tmp =
536 kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo),
537 GFP_KERNEL);
538 if (!tmp)
539 return -ENOMEM;
540
541 /* fill subdinfo structs */
542 for (i = 0; i < dev->n_subdevices; i++) {
543 s = &dev->subdevices[i];
544 us = tmp + i;
545
546 us->type = s->type;
547 us->n_chan = s->n_chan;
548 us->subd_flags = s->subdev_flags;
549 if (comedi_get_subdevice_runflags(s) & SRF_RUNNING)
550 us->subd_flags |= SDF_RUNNING;
551 #define TIMER_nanosec 5 /* backwards compatibility */
552 us->timer_type = TIMER_nanosec;
553 us->len_chanlist = s->len_chanlist;
554 us->maxdata = s->maxdata;
555 if (s->range_table) {
556 us->range_type =
557 (i << 24) | (0 << 16) | (s->range_table->length);
558 } else {
559 us->range_type = 0; /* XXX */
560 }
561 us->flags = s->flags;
562
563 if (s->busy)
564 us->subd_flags |= SDF_BUSY;
565 if (s->busy == file)
566 us->subd_flags |= SDF_BUSY_OWNER;
567 if (s->lock)
568 us->subd_flags |= SDF_LOCKED;
569 if (s->lock == file)
570 us->subd_flags |= SDF_LOCK_OWNER;
571 if (!s->maxdata && s->maxdata_list)
572 us->subd_flags |= SDF_MAXDATA;
573 if (s->flaglist)
574 us->subd_flags |= SDF_FLAGS;
575 if (s->range_table_list)
576 us->subd_flags |= SDF_RANGETYPE;
577 if (s->do_cmd)
578 us->subd_flags |= SDF_CMD;
579
580 if (s->insn_bits != &insn_inval)
581 us->insn_bits_support = COMEDI_SUPPORTED;
582 else
583 us->insn_bits_support = COMEDI_UNSUPPORTED;
584
585 us->settling_time_0 = s->settling_time_0;
586 }
587
588 ret = copy_to_user(arg, tmp,
589 dev->n_subdevices * sizeof(struct comedi_subdinfo));
590
591 kfree(tmp);
592
593 return ret ? -EFAULT : 0;
594 }
595
596 /*
597 COMEDI_CHANINFO
598 subdevice info ioctl
599
600 arg:
601 pointer to chaninfo structure
602
603 reads:
604 chaninfo structure at arg
605
606 writes:
607 arrays at elements of chaninfo structure
608
609 */
610 static int do_chaninfo_ioctl(struct comedi_device *dev,
611 struct comedi_chaninfo __user *arg)
612 {
613 struct comedi_subdevice *s;
614 struct comedi_chaninfo it;
615
616 if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo)))
617 return -EFAULT;
618
619 if (it.subdev >= dev->n_subdevices)
620 return -EINVAL;
621 s = &dev->subdevices[it.subdev];
622
623 if (it.maxdata_list) {
624 if (s->maxdata || !s->maxdata_list)
625 return -EINVAL;
626 if (copy_to_user(it.maxdata_list, s->maxdata_list,
627 s->n_chan * sizeof(unsigned int)))
628 return -EFAULT;
629 }
630
631 if (it.flaglist) {
632 if (!s->flaglist)
633 return -EINVAL;
634 if (copy_to_user(it.flaglist, s->flaglist,
635 s->n_chan * sizeof(unsigned int)))
636 return -EFAULT;
637 }
638
639 if (it.rangelist) {
640 int i;
641
642 if (!s->range_table_list)
643 return -EINVAL;
644 for (i = 0; i < s->n_chan; i++) {
645 int x;
646
647 x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
648 (s->range_table_list[i]->length);
649 if (put_user(x, it.rangelist + i))
650 return -EFAULT;
651 }
652 #if 0
653 if (copy_to_user(it.rangelist, s->range_type_list,
654 s->n_chan * sizeof(unsigned int)))
655 return -EFAULT;
656 #endif
657 }
658
659 return 0;
660 }
661
662 /*
663 COMEDI_BUFINFO
664 buffer information ioctl
665
666 arg:
667 pointer to bufinfo structure
668
669 reads:
670 bufinfo at arg
671
672 writes:
673 modified bufinfo at arg
674
675 */
676 static int do_bufinfo_ioctl(struct comedi_device *dev,
677 struct comedi_bufinfo __user *arg, void *file)
678 {
679 struct comedi_bufinfo bi;
680 struct comedi_subdevice *s;
681 struct comedi_async *async;
682
683 if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo)))
684 return -EFAULT;
685
686 if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0)
687 return -EINVAL;
688
689 s = &dev->subdevices[bi.subdevice];
690
691 if (s->lock && s->lock != file)
692 return -EACCES;
693
694 async = s->async;
695
696 if (!async) {
697 DPRINTK("subdevice does not have async capability\n");
698 bi.buf_write_ptr = 0;
699 bi.buf_read_ptr = 0;
700 bi.buf_write_count = 0;
701 bi.buf_read_count = 0;
702 bi.bytes_read = 0;
703 bi.bytes_written = 0;
704 goto copyback;
705 }
706 if (!s->busy) {
707 bi.bytes_read = 0;
708 bi.bytes_written = 0;
709 goto copyback_position;
710 }
711 if (s->busy != file)
712 return -EACCES;
713
714 if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) {
715 bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read);
716 comedi_buf_read_free(async, bi.bytes_read);
717
718 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR |
719 SRF_RUNNING))
720 && async->buf_write_count == async->buf_read_count) {
721 do_become_nonbusy(dev, s);
722 }
723 }
724
725 if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) {
726 bi.bytes_written =
727 comedi_buf_write_alloc(async, bi.bytes_written);
728 comedi_buf_write_free(async, bi.bytes_written);
729 }
730
731 copyback_position:
732 bi.buf_write_count = async->buf_write_count;
733 bi.buf_write_ptr = async->buf_write_ptr;
734 bi.buf_read_count = async->buf_read_count;
735 bi.buf_read_ptr = async->buf_read_ptr;
736
737 copyback:
738 if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo)))
739 return -EFAULT;
740
741 return 0;
742 }
743
744 static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
745 unsigned int *data, void *file);
746 /*
747 * COMEDI_INSNLIST
748 * synchronous instructions
749 *
750 * arg:
751 * pointer to sync cmd structure
752 *
753 * reads:
754 * sync cmd struct at arg
755 * instruction list
756 * data (for writes)
757 *
758 * writes:
759 * data (for reads)
760 */
761 /* arbitrary limits */
762 #define MAX_SAMPLES 256
763 static int do_insnlist_ioctl(struct comedi_device *dev,
764 struct comedi_insnlist __user *arg, void *file)
765 {
766 struct comedi_insnlist insnlist;
767 struct comedi_insn *insns = NULL;
768 unsigned int *data = NULL;
769 int i = 0;
770 int ret = 0;
771
772 if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist)))
773 return -EFAULT;
774
775 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
776 if (!data) {
777 DPRINTK("kmalloc failed\n");
778 ret = -ENOMEM;
779 goto error;
780 }
781
782 insns =
783 kcalloc(insnlist.n_insns, sizeof(struct comedi_insn), GFP_KERNEL);
784 if (!insns) {
785 DPRINTK("kmalloc failed\n");
786 ret = -ENOMEM;
787 goto error;
788 }
789
790 if (copy_from_user(insns, insnlist.insns,
791 sizeof(struct comedi_insn) * insnlist.n_insns)) {
792 DPRINTK("copy_from_user failed\n");
793 ret = -EFAULT;
794 goto error;
795 }
796
797 for (i = 0; i < insnlist.n_insns; i++) {
798 if (insns[i].n > MAX_SAMPLES) {
799 DPRINTK("number of samples too large\n");
800 ret = -EINVAL;
801 goto error;
802 }
803 if (insns[i].insn & INSN_MASK_WRITE) {
804 if (copy_from_user(data, insns[i].data,
805 insns[i].n * sizeof(unsigned int))) {
806 DPRINTK("copy_from_user failed\n");
807 ret = -EFAULT;
808 goto error;
809 }
810 }
811 ret = parse_insn(dev, insns + i, data, file);
812 if (ret < 0)
813 goto error;
814 if (insns[i].insn & INSN_MASK_READ) {
815 if (copy_to_user(insns[i].data, data,
816 insns[i].n * sizeof(unsigned int))) {
817 DPRINTK("copy_to_user failed\n");
818 ret = -EFAULT;
819 goto error;
820 }
821 }
822 if (need_resched())
823 schedule();
824 }
825
826 error:
827 kfree(insns);
828 kfree(data);
829
830 if (ret < 0)
831 return ret;
832 return i;
833 }
834
835 static int check_insn_config_length(struct comedi_insn *insn,
836 unsigned int *data)
837 {
838 if (insn->n < 1)
839 return -EINVAL;
840
841 switch (data[0]) {
842 case INSN_CONFIG_DIO_OUTPUT:
843 case INSN_CONFIG_DIO_INPUT:
844 case INSN_CONFIG_DISARM:
845 case INSN_CONFIG_RESET:
846 if (insn->n == 1)
847 return 0;
848 break;
849 case INSN_CONFIG_ARM:
850 case INSN_CONFIG_DIO_QUERY:
851 case INSN_CONFIG_BLOCK_SIZE:
852 case INSN_CONFIG_FILTER:
853 case INSN_CONFIG_SERIAL_CLOCK:
854 case INSN_CONFIG_BIDIRECTIONAL_DATA:
855 case INSN_CONFIG_ALT_SOURCE:
856 case INSN_CONFIG_SET_COUNTER_MODE:
857 case INSN_CONFIG_8254_READ_STATUS:
858 case INSN_CONFIG_SET_ROUTING:
859 case INSN_CONFIG_GET_ROUTING:
860 case INSN_CONFIG_GET_PWM_STATUS:
861 case INSN_CONFIG_PWM_SET_PERIOD:
862 case INSN_CONFIG_PWM_GET_PERIOD:
863 if (insn->n == 2)
864 return 0;
865 break;
866 case INSN_CONFIG_SET_GATE_SRC:
867 case INSN_CONFIG_GET_GATE_SRC:
868 case INSN_CONFIG_SET_CLOCK_SRC:
869 case INSN_CONFIG_GET_CLOCK_SRC:
870 case INSN_CONFIG_SET_OTHER_SRC:
871 case INSN_CONFIG_GET_COUNTER_STATUS:
872 case INSN_CONFIG_PWM_SET_H_BRIDGE:
873 case INSN_CONFIG_PWM_GET_H_BRIDGE:
874 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE:
875 if (insn->n == 3)
876 return 0;
877 break;
878 case INSN_CONFIG_PWM_OUTPUT:
879 case INSN_CONFIG_ANALOG_TRIG:
880 if (insn->n == 5)
881 return 0;
882 break;
883 /* by default we allow the insn since we don't have checks for
884 * all possible cases yet */
885 default:
886 pr_warn("comedi: No check for data length of config insn id %i is implemented.\n",
887 data[0]);
888 pr_warn("comedi: Add a check to %s in %s.\n",
889 __func__, __FILE__);
890 pr_warn("comedi: Assuming n=%i is correct.\n", insn->n);
891 return 0;
892 }
893 return -EINVAL;
894 }
895
896 static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
897 unsigned int *data, void *file)
898 {
899 struct comedi_subdevice *s;
900 int ret = 0;
901 int i;
902
903 if (insn->insn & INSN_MASK_SPECIAL) {
904 /* a non-subdevice instruction */
905
906 switch (insn->insn) {
907 case INSN_GTOD:
908 {
909 struct timeval tv;
910
911 if (insn->n != 2) {
912 ret = -EINVAL;
913 break;
914 }
915
916 do_gettimeofday(&tv);
917 data[0] = tv.tv_sec;
918 data[1] = tv.tv_usec;
919 ret = 2;
920
921 break;
922 }
923 case INSN_WAIT:
924 if (insn->n != 1 || data[0] >= 100000) {
925 ret = -EINVAL;
926 break;
927 }
928 udelay(data[0] / 1000);
929 ret = 1;
930 break;
931 case INSN_INTTRIG:
932 if (insn->n != 1) {
933 ret = -EINVAL;
934 break;
935 }
936 if (insn->subdev >= dev->n_subdevices) {
937 DPRINTK("%d not usable subdevice\n",
938 insn->subdev);
939 ret = -EINVAL;
940 break;
941 }
942 s = &dev->subdevices[insn->subdev];
943 if (!s->async) {
944 DPRINTK("no async\n");
945 ret = -EINVAL;
946 break;
947 }
948 if (!s->async->inttrig) {
949 DPRINTK("no inttrig\n");
950 ret = -EAGAIN;
951 break;
952 }
953 ret = s->async->inttrig(dev, s, data[0]);
954 if (ret >= 0)
955 ret = 1;
956 break;
957 default:
958 DPRINTK("invalid insn\n");
959 ret = -EINVAL;
960 break;
961 }
962 } else {
963 /* a subdevice instruction */
964 unsigned int maxdata;
965
966 if (insn->subdev >= dev->n_subdevices) {
967 DPRINTK("subdevice %d out of range\n", insn->subdev);
968 ret = -EINVAL;
969 goto out;
970 }
971 s = &dev->subdevices[insn->subdev];
972
973 if (s->type == COMEDI_SUBD_UNUSED) {
974 DPRINTK("%d not usable subdevice\n", insn->subdev);
975 ret = -EIO;
976 goto out;
977 }
978
979 /* are we locked? (ioctl lock) */
980 if (s->lock && s->lock != file) {
981 DPRINTK("device locked\n");
982 ret = -EACCES;
983 goto out;
984 }
985
986 ret = comedi_check_chanlist(s, 1, &insn->chanspec);
987 if (ret < 0) {
988 ret = -EINVAL;
989 DPRINTK("bad chanspec\n");
990 goto out;
991 }
992
993 if (s->busy) {
994 ret = -EBUSY;
995 goto out;
996 }
997 /* This looks arbitrary. It is. */
998 s->busy = &parse_insn;
999 switch (insn->insn) {
1000 case INSN_READ:
1001 ret = s->insn_read(dev, s, insn, data);
1002 break;
1003 case INSN_WRITE:
1004 maxdata = s->maxdata_list
1005 ? s->maxdata_list[CR_CHAN(insn->chanspec)]
1006 : s->maxdata;
1007 for (i = 0; i < insn->n; ++i) {
1008 if (data[i] > maxdata) {
1009 ret = -EINVAL;
1010 DPRINTK("bad data value(s)\n");
1011 break;
1012 }
1013 }
1014 if (ret == 0)
1015 ret = s->insn_write(dev, s, insn, data);
1016 break;
1017 case INSN_BITS:
1018 if (insn->n != 2) {
1019 ret = -EINVAL;
1020 } else {
1021 /* Most drivers ignore the base channel in
1022 * insn->chanspec. Fix this here if
1023 * the subdevice has <= 32 channels. */
1024 unsigned int shift;
1025 unsigned int orig_mask;
1026
1027 orig_mask = data[0];
1028 if (s->n_chan <= 32) {
1029 shift = CR_CHAN(insn->chanspec);
1030 if (shift > 0) {
1031 insn->chanspec = 0;
1032 data[0] <<= shift;
1033 data[1] <<= shift;
1034 }
1035 } else
1036 shift = 0;
1037 ret = s->insn_bits(dev, s, insn, data);
1038 data[0] = orig_mask;
1039 if (shift > 0)
1040 data[1] >>= shift;
1041 }
1042 break;
1043 case INSN_CONFIG:
1044 ret = check_insn_config_length(insn, data);
1045 if (ret)
1046 break;
1047 ret = s->insn_config(dev, s, insn, data);
1048 break;
1049 default:
1050 ret = -EINVAL;
1051 break;
1052 }
1053
1054 s->busy = NULL;
1055 }
1056
1057 out:
1058 return ret;
1059 }
1060
1061 /*
1062 * COMEDI_INSN
1063 * synchronous instructions
1064 *
1065 * arg:
1066 * pointer to insn
1067 *
1068 * reads:
1069 * struct comedi_insn struct at arg
1070 * data (for writes)
1071 *
1072 * writes:
1073 * data (for reads)
1074 */
1075 static int do_insn_ioctl(struct comedi_device *dev,
1076 struct comedi_insn __user *arg, void *file)
1077 {
1078 struct comedi_insn insn;
1079 unsigned int *data = NULL;
1080 int ret = 0;
1081
1082 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
1083 if (!data) {
1084 ret = -ENOMEM;
1085 goto error;
1086 }
1087
1088 if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) {
1089 ret = -EFAULT;
1090 goto error;
1091 }
1092
1093 /* This is where the behavior of insn and insnlist deviate. */
1094 if (insn.n > MAX_SAMPLES)
1095 insn.n = MAX_SAMPLES;
1096 if (insn.insn & INSN_MASK_WRITE) {
1097 if (copy_from_user(data,
1098 insn.data,
1099 insn.n * sizeof(unsigned int))) {
1100 ret = -EFAULT;
1101 goto error;
1102 }
1103 }
1104 ret = parse_insn(dev, &insn, data, file);
1105 if (ret < 0)
1106 goto error;
1107 if (insn.insn & INSN_MASK_READ) {
1108 if (copy_to_user(insn.data,
1109 data,
1110 insn.n * sizeof(unsigned int))) {
1111 ret = -EFAULT;
1112 goto error;
1113 }
1114 }
1115 ret = insn.n;
1116
1117 error:
1118 kfree(data);
1119
1120 return ret;
1121 }
1122
1123 static void comedi_set_subdevice_runflags(struct comedi_subdevice *s,
1124 unsigned mask, unsigned bits)
1125 {
1126 unsigned long flags;
1127
1128 spin_lock_irqsave(&s->spin_lock, flags);
1129 s->runflags &= ~mask;
1130 s->runflags |= (bits & mask);
1131 spin_unlock_irqrestore(&s->spin_lock, flags);
1132 }
1133
1134 static int do_cmd_ioctl(struct comedi_device *dev,
1135 struct comedi_cmd __user *arg, void *file)
1136 {
1137 struct comedi_cmd cmd;
1138 struct comedi_subdevice *s;
1139 struct comedi_async *async;
1140 int ret = 0;
1141 unsigned int __user *user_chanlist;
1142
1143 if (copy_from_user(&cmd, arg, sizeof(struct comedi_cmd))) {
1144 DPRINTK("bad cmd address\n");
1145 return -EFAULT;
1146 }
1147 /* save user's chanlist pointer so it can be restored later */
1148 user_chanlist = (unsigned int __user *)cmd.chanlist;
1149
1150 if (cmd.subdev >= dev->n_subdevices) {
1151 DPRINTK("%d no such subdevice\n", cmd.subdev);
1152 return -ENODEV;
1153 }
1154
1155 s = &dev->subdevices[cmd.subdev];
1156 async = s->async;
1157
1158 if (s->type == COMEDI_SUBD_UNUSED) {
1159 DPRINTK("%d not valid subdevice\n", cmd.subdev);
1160 return -EIO;
1161 }
1162
1163 if (!s->do_cmd || !s->do_cmdtest || !s->async) {
1164 DPRINTK("subdevice %i does not support commands\n",
1165 cmd.subdev);
1166 return -EIO;
1167 }
1168
1169 /* are we locked? (ioctl lock) */
1170 if (s->lock && s->lock != file) {
1171 DPRINTK("subdevice locked\n");
1172 return -EACCES;
1173 }
1174
1175 /* are we busy? */
1176 if (s->busy) {
1177 DPRINTK("subdevice busy\n");
1178 return -EBUSY;
1179 }
1180 s->busy = file;
1181
1182 /* make sure channel/gain list isn't too long */
1183 if (cmd.chanlist_len > s->len_chanlist) {
1184 DPRINTK("channel/gain list too long %u > %d\n",
1185 cmd.chanlist_len, s->len_chanlist);
1186 ret = -EINVAL;
1187 goto cleanup;
1188 }
1189
1190 /* make sure channel/gain list isn't too short */
1191 if (cmd.chanlist_len < 1) {
1192 DPRINTK("channel/gain list too short %u < 1\n",
1193 cmd.chanlist_len);
1194 ret = -EINVAL;
1195 goto cleanup;
1196 }
1197
1198 async->cmd = cmd;
1199 async->cmd.data = NULL;
1200 /* load channel/gain list */
1201 async->cmd.chanlist =
1202 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1203 if (!async->cmd.chanlist) {
1204 DPRINTK("allocation failed\n");
1205 ret = -ENOMEM;
1206 goto cleanup;
1207 }
1208
1209 if (copy_from_user(async->cmd.chanlist, user_chanlist,
1210 async->cmd.chanlist_len * sizeof(int))) {
1211 DPRINTK("fault reading chanlist\n");
1212 ret = -EFAULT;
1213 goto cleanup;
1214 }
1215
1216 /* make sure each element in channel/gain list is valid */
1217 ret = comedi_check_chanlist(s,
1218 async->cmd.chanlist_len,
1219 async->cmd.chanlist);
1220 if (ret < 0) {
1221 DPRINTK("bad chanlist\n");
1222 goto cleanup;
1223 }
1224
1225 ret = s->do_cmdtest(dev, s, &async->cmd);
1226
1227 if (async->cmd.flags & TRIG_BOGUS || ret) {
1228 DPRINTK("test returned %d\n", ret);
1229 cmd = async->cmd;
1230 /* restore chanlist pointer before copying back */
1231 cmd.chanlist = (unsigned int __force *)user_chanlist;
1232 cmd.data = NULL;
1233 if (copy_to_user(arg, &cmd, sizeof(struct comedi_cmd))) {
1234 DPRINTK("fault writing cmd\n");
1235 ret = -EFAULT;
1236 goto cleanup;
1237 }
1238 ret = -EAGAIN;
1239 goto cleanup;
1240 }
1241
1242 if (!async->prealloc_bufsz) {
1243 ret = -ENOMEM;
1244 DPRINTK("no buffer (?)\n");
1245 goto cleanup;
1246 }
1247
1248 comedi_reset_async_buf(async);
1249
1250 async->cb_mask =
1251 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
1252 COMEDI_CB_OVERFLOW;
1253 if (async->cmd.flags & TRIG_WAKE_EOS)
1254 async->cb_mask |= COMEDI_CB_EOS;
1255
1256 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
1257
1258 ret = s->do_cmd(dev, s);
1259 if (ret == 0)
1260 return 0;
1261
1262 cleanup:
1263 do_become_nonbusy(dev, s);
1264
1265 return ret;
1266 }
1267
1268 /*
1269 COMEDI_CMDTEST
1270 command testing ioctl
1271
1272 arg:
1273 pointer to cmd structure
1274
1275 reads:
1276 cmd structure at arg
1277 channel/range list
1278
1279 writes:
1280 modified cmd structure at arg
1281
1282 */
1283 static int do_cmdtest_ioctl(struct comedi_device *dev,
1284 struct comedi_cmd __user *arg, void *file)
1285 {
1286 struct comedi_cmd cmd;
1287 struct comedi_subdevice *s;
1288 int ret = 0;
1289 unsigned int *chanlist = NULL;
1290 unsigned int __user *user_chanlist;
1291
1292 if (copy_from_user(&cmd, arg, sizeof(struct comedi_cmd))) {
1293 DPRINTK("bad cmd address\n");
1294 return -EFAULT;
1295 }
1296 /* save user's chanlist pointer so it can be restored later */
1297 user_chanlist = (unsigned int __user *)cmd.chanlist;
1298
1299 if (cmd.subdev >= dev->n_subdevices) {
1300 DPRINTK("%d no such subdevice\n", cmd.subdev);
1301 return -ENODEV;
1302 }
1303
1304 s = &dev->subdevices[cmd.subdev];
1305 if (s->type == COMEDI_SUBD_UNUSED) {
1306 DPRINTK("%d not valid subdevice\n", cmd.subdev);
1307 return -EIO;
1308 }
1309
1310 if (!s->do_cmd || !s->do_cmdtest) {
1311 DPRINTK("subdevice %i does not support commands\n",
1312 cmd.subdev);
1313 return -EIO;
1314 }
1315
1316 /* make sure channel/gain list isn't too long */
1317 if (cmd.chanlist_len > s->len_chanlist) {
1318 DPRINTK("channel/gain list too long %d > %d\n",
1319 cmd.chanlist_len, s->len_chanlist);
1320 ret = -EINVAL;
1321 goto cleanup;
1322 }
1323
1324 /* load channel/gain list */
1325 if (cmd.chanlist) {
1326 chanlist =
1327 kmalloc(cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1328 if (!chanlist) {
1329 DPRINTK("allocation failed\n");
1330 ret = -ENOMEM;
1331 goto cleanup;
1332 }
1333
1334 if (copy_from_user(chanlist, user_chanlist,
1335 cmd.chanlist_len * sizeof(int))) {
1336 DPRINTK("fault reading chanlist\n");
1337 ret = -EFAULT;
1338 goto cleanup;
1339 }
1340
1341 /* make sure each element in channel/gain list is valid */
1342 ret = comedi_check_chanlist(s, cmd.chanlist_len, chanlist);
1343 if (ret < 0) {
1344 DPRINTK("bad chanlist\n");
1345 goto cleanup;
1346 }
1347
1348 cmd.chanlist = chanlist;
1349 }
1350
1351 ret = s->do_cmdtest(dev, s, &cmd);
1352
1353 /* restore chanlist pointer before copying back */
1354 cmd.chanlist = (unsigned int __force *)user_chanlist;
1355
1356 if (copy_to_user(arg, &cmd, sizeof(struct comedi_cmd))) {
1357 DPRINTK("bad cmd address\n");
1358 ret = -EFAULT;
1359 goto cleanup;
1360 }
1361 cleanup:
1362 kfree(chanlist);
1363
1364 return ret;
1365 }
1366
1367 /*
1368 COMEDI_LOCK
1369 lock subdevice
1370
1371 arg:
1372 subdevice number
1373
1374 reads:
1375 none
1376
1377 writes:
1378 none
1379
1380 */
1381
1382 static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
1383 void *file)
1384 {
1385 int ret = 0;
1386 unsigned long flags;
1387 struct comedi_subdevice *s;
1388
1389 if (arg >= dev->n_subdevices)
1390 return -EINVAL;
1391 s = &dev->subdevices[arg];
1392
1393 spin_lock_irqsave(&s->spin_lock, flags);
1394 if (s->busy || s->lock)
1395 ret = -EBUSY;
1396 else
1397 s->lock = file;
1398 spin_unlock_irqrestore(&s->spin_lock, flags);
1399
1400 #if 0
1401 if (ret < 0)
1402 return ret;
1403
1404 if (s->lock_f)
1405 ret = s->lock_f(dev, s);
1406 #endif
1407
1408 return ret;
1409 }
1410
1411 /*
1412 COMEDI_UNLOCK
1413 unlock subdevice
1414
1415 arg:
1416 subdevice number
1417
1418 reads:
1419 none
1420
1421 writes:
1422 none
1423
1424 This function isn't protected by the semaphore, since
1425 we already own the lock.
1426 */
1427 static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
1428 void *file)
1429 {
1430 struct comedi_subdevice *s;
1431
1432 if (arg >= dev->n_subdevices)
1433 return -EINVAL;
1434 s = &dev->subdevices[arg];
1435
1436 if (s->busy)
1437 return -EBUSY;
1438
1439 if (s->lock && s->lock != file)
1440 return -EACCES;
1441
1442 if (s->lock == file) {
1443 #if 0
1444 if (s->unlock)
1445 s->unlock(dev, s);
1446 #endif
1447
1448 s->lock = NULL;
1449 }
1450
1451 return 0;
1452 }
1453
1454 /*
1455 COMEDI_CANCEL
1456 cancel acquisition ioctl
1457
1458 arg:
1459 subdevice number
1460
1461 reads:
1462 nothing
1463
1464 writes:
1465 nothing
1466
1467 */
1468 static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
1469 void *file)
1470 {
1471 struct comedi_subdevice *s;
1472
1473 if (arg >= dev->n_subdevices)
1474 return -EINVAL;
1475 s = &dev->subdevices[arg];
1476 if (s->async == NULL)
1477 return -EINVAL;
1478
1479 if (s->lock && s->lock != file)
1480 return -EACCES;
1481
1482 if (!s->busy)
1483 return 0;
1484
1485 if (s->busy != file)
1486 return -EBUSY;
1487
1488 return do_cancel(dev, s);
1489 }
1490
1491 /*
1492 COMEDI_POLL ioctl
1493 instructs driver to synchronize buffers
1494
1495 arg:
1496 subdevice number
1497
1498 reads:
1499 nothing
1500
1501 writes:
1502 nothing
1503
1504 */
1505 static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg,
1506 void *file)
1507 {
1508 struct comedi_subdevice *s;
1509
1510 if (arg >= dev->n_subdevices)
1511 return -EINVAL;
1512 s = &dev->subdevices[arg];
1513
1514 if (s->lock && s->lock != file)
1515 return -EACCES;
1516
1517 if (!s->busy)
1518 return 0;
1519
1520 if (s->busy != file)
1521 return -EBUSY;
1522
1523 if (s->poll)
1524 return s->poll(dev, s);
1525
1526 return -EINVAL;
1527 }
1528
1529 static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
1530 unsigned long arg)
1531 {
1532 const unsigned minor = iminor(file->f_dentry->d_inode);
1533 struct comedi_device_file_info *dev_file_info =
1534 comedi_get_device_file_info(minor);
1535 struct comedi_device *dev;
1536 int rc;
1537
1538 if (dev_file_info == NULL || dev_file_info->device == NULL)
1539 return -ENODEV;
1540 dev = dev_file_info->device;
1541
1542 mutex_lock(&dev->mutex);
1543
1544 /* Device config is special, because it must work on
1545 * an unconfigured device. */
1546 if (cmd == COMEDI_DEVCONFIG) {
1547 rc = do_devconfig_ioctl(dev,
1548 (struct comedi_devconfig __user *)arg);
1549 goto done;
1550 }
1551
1552 if (!dev->attached) {
1553 DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor);
1554 rc = -ENODEV;
1555 goto done;
1556 }
1557
1558 switch (cmd) {
1559 case COMEDI_BUFCONFIG:
1560 rc = do_bufconfig_ioctl(dev,
1561 (struct comedi_bufconfig __user *)arg);
1562 break;
1563 case COMEDI_DEVINFO:
1564 rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg,
1565 file);
1566 break;
1567 case COMEDI_SUBDINFO:
1568 rc = do_subdinfo_ioctl(dev,
1569 (struct comedi_subdinfo __user *)arg,
1570 file);
1571 break;
1572 case COMEDI_CHANINFO:
1573 rc = do_chaninfo_ioctl(dev, (void __user *)arg);
1574 break;
1575 case COMEDI_RANGEINFO:
1576 rc = do_rangeinfo_ioctl(dev, (void __user *)arg);
1577 break;
1578 case COMEDI_BUFINFO:
1579 rc = do_bufinfo_ioctl(dev,
1580 (struct comedi_bufinfo __user *)arg,
1581 file);
1582 break;
1583 case COMEDI_LOCK:
1584 rc = do_lock_ioctl(dev, arg, file);
1585 break;
1586 case COMEDI_UNLOCK:
1587 rc = do_unlock_ioctl(dev, arg, file);
1588 break;
1589 case COMEDI_CANCEL:
1590 rc = do_cancel_ioctl(dev, arg, file);
1591 break;
1592 case COMEDI_CMD:
1593 rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file);
1594 break;
1595 case COMEDI_CMDTEST:
1596 rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg,
1597 file);
1598 break;
1599 case COMEDI_INSNLIST:
1600 rc = do_insnlist_ioctl(dev,
1601 (struct comedi_insnlist __user *)arg,
1602 file);
1603 break;
1604 case COMEDI_INSN:
1605 rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg,
1606 file);
1607 break;
1608 case COMEDI_POLL:
1609 rc = do_poll_ioctl(dev, arg, file);
1610 break;
1611 default:
1612 rc = -ENOTTY;
1613 break;
1614 }
1615
1616 done:
1617 mutex_unlock(&dev->mutex);
1618 return rc;
1619 }
1620
1621 static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
1622 {
1623 int ret = 0;
1624
1625 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel)
1626 ret = s->cancel(dev, s);
1627
1628 do_become_nonbusy(dev, s);
1629
1630 return ret;
1631 }
1632
1633
1634 static void comedi_vm_open(struct vm_area_struct *area)
1635 {
1636 struct comedi_async *async;
1637 struct comedi_device *dev;
1638
1639 async = area->vm_private_data;
1640 dev = async->subdevice->device;
1641
1642 mutex_lock(&dev->mutex);
1643 async->mmap_count++;
1644 mutex_unlock(&dev->mutex);
1645 }
1646
1647 static void comedi_vm_close(struct vm_area_struct *area)
1648 {
1649 struct comedi_async *async;
1650 struct comedi_device *dev;
1651
1652 async = area->vm_private_data;
1653 dev = async->subdevice->device;
1654
1655 mutex_lock(&dev->mutex);
1656 async->mmap_count--;
1657 mutex_unlock(&dev->mutex);
1658 }
1659
1660 static struct vm_operations_struct comedi_vm_ops = {
1661 .open = comedi_vm_open,
1662 .close = comedi_vm_close,
1663 };
1664
1665 static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
1666 {
1667 const unsigned minor = iminor(file->f_dentry->d_inode);
1668 struct comedi_async *async = NULL;
1669 unsigned long start = vma->vm_start;
1670 unsigned long size;
1671 int n_pages;
1672 int i;
1673 int retval;
1674 struct comedi_subdevice *s;
1675 struct comedi_device_file_info *dev_file_info;
1676 struct comedi_device *dev;
1677
1678 dev_file_info = comedi_get_device_file_info(minor);
1679 if (dev_file_info == NULL)
1680 return -ENODEV;
1681 dev = dev_file_info->device;
1682 if (dev == NULL)
1683 return -ENODEV;
1684
1685 mutex_lock(&dev->mutex);
1686 if (!dev->attached) {
1687 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1688 retval = -ENODEV;
1689 goto done;
1690 }
1691 if (vma->vm_flags & VM_WRITE)
1692 s = comedi_get_write_subdevice(dev_file_info);
1693 else
1694 s = comedi_get_read_subdevice(dev_file_info);
1695
1696 if (s == NULL) {
1697 retval = -EINVAL;
1698 goto done;
1699 }
1700 async = s->async;
1701 if (async == NULL) {
1702 retval = -EINVAL;
1703 goto done;
1704 }
1705
1706 if (vma->vm_pgoff != 0) {
1707 DPRINTK("comedi: mmap() offset must be 0.\n");
1708 retval = -EINVAL;
1709 goto done;
1710 }
1711
1712 size = vma->vm_end - vma->vm_start;
1713 if (size > async->prealloc_bufsz) {
1714 retval = -EFAULT;
1715 goto done;
1716 }
1717 if (size & (~PAGE_MASK)) {
1718 retval = -EFAULT;
1719 goto done;
1720 }
1721
1722 n_pages = size >> PAGE_SHIFT;
1723 for (i = 0; i < n_pages; ++i) {
1724 if (remap_pfn_range(vma, start,
1725 page_to_pfn(virt_to_page
1726 (async->buf_page_list
1727 [i].virt_addr)), PAGE_SIZE,
1728 PAGE_SHARED)) {
1729 retval = -EAGAIN;
1730 goto done;
1731 }
1732 start += PAGE_SIZE;
1733 }
1734
1735 vma->vm_ops = &comedi_vm_ops;
1736 vma->vm_private_data = async;
1737
1738 async->mmap_count++;
1739
1740 retval = 0;
1741 done:
1742 mutex_unlock(&dev->mutex);
1743 return retval;
1744 }
1745
1746 static unsigned int comedi_poll(struct file *file, poll_table *wait)
1747 {
1748 unsigned int mask = 0;
1749 const unsigned minor = iminor(file->f_dentry->d_inode);
1750 struct comedi_subdevice *read_subdev;
1751 struct comedi_subdevice *write_subdev;
1752 struct comedi_device_file_info *dev_file_info;
1753 struct comedi_device *dev;
1754 dev_file_info = comedi_get_device_file_info(minor);
1755
1756 if (dev_file_info == NULL)
1757 return -ENODEV;
1758 dev = dev_file_info->device;
1759 if (dev == NULL)
1760 return -ENODEV;
1761
1762 mutex_lock(&dev->mutex);
1763 if (!dev->attached) {
1764 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1765 mutex_unlock(&dev->mutex);
1766 return 0;
1767 }
1768
1769 mask = 0;
1770 read_subdev = comedi_get_read_subdevice(dev_file_info);
1771 if (read_subdev) {
1772 poll_wait(file, &read_subdev->async->wait_head, wait);
1773 if (!read_subdev->busy
1774 || comedi_buf_read_n_available(read_subdev->async) > 0
1775 || !(comedi_get_subdevice_runflags(read_subdev) &
1776 SRF_RUNNING)) {
1777 mask |= POLLIN | POLLRDNORM;
1778 }
1779 }
1780 write_subdev = comedi_get_write_subdevice(dev_file_info);
1781 if (write_subdev) {
1782 poll_wait(file, &write_subdev->async->wait_head, wait);
1783 comedi_buf_write_alloc(write_subdev->async,
1784 write_subdev->async->prealloc_bufsz);
1785 if (!write_subdev->busy
1786 || !(comedi_get_subdevice_runflags(write_subdev) &
1787 SRF_RUNNING)
1788 || comedi_buf_write_n_allocated(write_subdev->async) >=
1789 bytes_per_sample(write_subdev->async->subdevice)) {
1790 mask |= POLLOUT | POLLWRNORM;
1791 }
1792 }
1793
1794 mutex_unlock(&dev->mutex);
1795 return mask;
1796 }
1797
1798 static ssize_t comedi_write(struct file *file, const char __user *buf,
1799 size_t nbytes, loff_t *offset)
1800 {
1801 struct comedi_subdevice *s;
1802 struct comedi_async *async;
1803 int n, m, count = 0, retval = 0;
1804 DECLARE_WAITQUEUE(wait, current);
1805 const unsigned minor = iminor(file->f_dentry->d_inode);
1806 struct comedi_device_file_info *dev_file_info;
1807 struct comedi_device *dev;
1808 dev_file_info = comedi_get_device_file_info(minor);
1809
1810 if (dev_file_info == NULL)
1811 return -ENODEV;
1812 dev = dev_file_info->device;
1813 if (dev == NULL)
1814 return -ENODEV;
1815
1816 if (!dev->attached) {
1817 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1818 retval = -ENODEV;
1819 goto done;
1820 }
1821
1822 s = comedi_get_write_subdevice(dev_file_info);
1823 if (s == NULL) {
1824 retval = -EIO;
1825 goto done;
1826 }
1827 async = s->async;
1828
1829 if (!nbytes) {
1830 retval = 0;
1831 goto done;
1832 }
1833 if (!s->busy) {
1834 retval = 0;
1835 goto done;
1836 }
1837 if (s->busy != file) {
1838 retval = -EACCES;
1839 goto done;
1840 }
1841 add_wait_queue(&async->wait_head, &wait);
1842 while (nbytes > 0 && !retval) {
1843 set_current_state(TASK_INTERRUPTIBLE);
1844
1845 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1846 if (count == 0) {
1847 if (comedi_get_subdevice_runflags(s) &
1848 SRF_ERROR) {
1849 retval = -EPIPE;
1850 } else {
1851 retval = 0;
1852 }
1853 do_become_nonbusy(dev, s);
1854 }
1855 break;
1856 }
1857
1858 n = nbytes;
1859
1860 m = n;
1861 if (async->buf_write_ptr + m > async->prealloc_bufsz)
1862 m = async->prealloc_bufsz - async->buf_write_ptr;
1863 comedi_buf_write_alloc(async, async->prealloc_bufsz);
1864 if (m > comedi_buf_write_n_allocated(async))
1865 m = comedi_buf_write_n_allocated(async);
1866 if (m < n)
1867 n = m;
1868
1869 if (n == 0) {
1870 if (file->f_flags & O_NONBLOCK) {
1871 retval = -EAGAIN;
1872 break;
1873 }
1874 schedule();
1875 if (signal_pending(current)) {
1876 retval = -ERESTARTSYS;
1877 break;
1878 }
1879 if (!s->busy)
1880 break;
1881 if (s->busy != file) {
1882 retval = -EACCES;
1883 break;
1884 }
1885 continue;
1886 }
1887
1888 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr,
1889 buf, n);
1890 if (m) {
1891 n -= m;
1892 retval = -EFAULT;
1893 }
1894 comedi_buf_write_free(async, n);
1895
1896 count += n;
1897 nbytes -= n;
1898
1899 buf += n;
1900 break; /* makes device work like a pipe */
1901 }
1902 set_current_state(TASK_RUNNING);
1903 remove_wait_queue(&async->wait_head, &wait);
1904
1905 done:
1906 return count ? count : retval;
1907 }
1908
1909 static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
1910 loff_t *offset)
1911 {
1912 struct comedi_subdevice *s;
1913 struct comedi_async *async;
1914 int n, m, count = 0, retval = 0;
1915 DECLARE_WAITQUEUE(wait, current);
1916 const unsigned minor = iminor(file->f_dentry->d_inode);
1917 struct comedi_device_file_info *dev_file_info;
1918 struct comedi_device *dev;
1919 dev_file_info = comedi_get_device_file_info(minor);
1920
1921 if (dev_file_info == NULL)
1922 return -ENODEV;
1923 dev = dev_file_info->device;
1924 if (dev == NULL)
1925 return -ENODEV;
1926
1927 if (!dev->attached) {
1928 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1929 retval = -ENODEV;
1930 goto done;
1931 }
1932
1933 s = comedi_get_read_subdevice(dev_file_info);
1934 if (s == NULL) {
1935 retval = -EIO;
1936 goto done;
1937 }
1938 async = s->async;
1939 if (!nbytes) {
1940 retval = 0;
1941 goto done;
1942 }
1943 if (!s->busy) {
1944 retval = 0;
1945 goto done;
1946 }
1947 if (s->busy != file) {
1948 retval = -EACCES;
1949 goto done;
1950 }
1951
1952 add_wait_queue(&async->wait_head, &wait);
1953 while (nbytes > 0 && !retval) {
1954 set_current_state(TASK_INTERRUPTIBLE);
1955
1956 n = nbytes;
1957
1958 m = comedi_buf_read_n_available(async);
1959 /* printk("%d available\n",m); */
1960 if (async->buf_read_ptr + m > async->prealloc_bufsz)
1961 m = async->prealloc_bufsz - async->buf_read_ptr;
1962 /* printk("%d contiguous\n",m); */
1963 if (m < n)
1964 n = m;
1965
1966 if (n == 0) {
1967 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1968 do_become_nonbusy(dev, s);
1969 if (comedi_get_subdevice_runflags(s) &
1970 SRF_ERROR) {
1971 retval = -EPIPE;
1972 } else {
1973 retval = 0;
1974 }
1975 break;
1976 }
1977 if (file->f_flags & O_NONBLOCK) {
1978 retval = -EAGAIN;
1979 break;
1980 }
1981 schedule();
1982 if (signal_pending(current)) {
1983 retval = -ERESTARTSYS;
1984 break;
1985 }
1986 if (!s->busy) {
1987 retval = 0;
1988 break;
1989 }
1990 if (s->busy != file) {
1991 retval = -EACCES;
1992 break;
1993 }
1994 continue;
1995 }
1996 m = copy_to_user(buf, async->prealloc_buf +
1997 async->buf_read_ptr, n);
1998 if (m) {
1999 n -= m;
2000 retval = -EFAULT;
2001 }
2002
2003 comedi_buf_read_alloc(async, n);
2004 comedi_buf_read_free(async, n);
2005
2006 count += n;
2007 nbytes -= n;
2008
2009 buf += n;
2010 break; /* makes device work like a pipe */
2011 }
2012 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) &&
2013 async->buf_read_count - async->buf_write_count == 0) {
2014 do_become_nonbusy(dev, s);
2015 }
2016 set_current_state(TASK_RUNNING);
2017 remove_wait_queue(&async->wait_head, &wait);
2018
2019 done:
2020 return count ? count : retval;
2021 }
2022
2023 /*
2024 This function restores a subdevice to an idle state.
2025 */
2026 static void do_become_nonbusy(struct comedi_device *dev,
2027 struct comedi_subdevice *s)
2028 {
2029 struct comedi_async *async = s->async;
2030
2031 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
2032 if (async) {
2033 comedi_reset_async_buf(async);
2034 async->inttrig = NULL;
2035 kfree(async->cmd.chanlist);
2036 async->cmd.chanlist = NULL;
2037 } else {
2038 dev_err(dev->class_dev,
2039 "BUG: (?) do_become_nonbusy called with async=NULL\n");
2040 }
2041
2042 s->busy = NULL;
2043 }
2044
2045 static int comedi_open(struct inode *inode, struct file *file)
2046 {
2047 const unsigned minor = iminor(inode);
2048 struct comedi_device_file_info *dev_file_info =
2049 comedi_get_device_file_info(minor);
2050 struct comedi_device *dev =
2051 dev_file_info ? dev_file_info->device : NULL;
2052
2053 if (dev == NULL) {
2054 DPRINTK("invalid minor number\n");
2055 return -ENODEV;
2056 }
2057
2058 /* This is slightly hacky, but we want module autoloading
2059 * to work for root.
2060 * case: user opens device, attached -> ok
2061 * case: user opens device, unattached, in_request_module=0 -> autoload
2062 * case: user opens device, unattached, in_request_module=1 -> fail
2063 * case: root opens device, attached -> ok
2064 * case: root opens device, unattached, in_request_module=1 -> ok
2065 * (typically called from modprobe)
2066 * case: root opens device, unattached, in_request_module=0 -> autoload
2067 *
2068 * The last could be changed to "-> ok", which would deny root
2069 * autoloading.
2070 */
2071 mutex_lock(&dev->mutex);
2072 if (dev->attached)
2073 goto ok;
2074 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) {
2075 DPRINTK("in request module\n");
2076 mutex_unlock(&dev->mutex);
2077 return -ENODEV;
2078 }
2079 if (capable(CAP_NET_ADMIN) && dev->in_request_module)
2080 goto ok;
2081
2082 dev->in_request_module = 1;
2083
2084 #ifdef CONFIG_KMOD
2085 mutex_unlock(&dev->mutex);
2086 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor);
2087 mutex_lock(&dev->mutex);
2088 #endif
2089
2090 dev->in_request_module = 0;
2091
2092 if (!dev->attached && !capable(CAP_NET_ADMIN)) {
2093 DPRINTK("not attached and not CAP_NET_ADMIN\n");
2094 mutex_unlock(&dev->mutex);
2095 return -ENODEV;
2096 }
2097 ok:
2098 __module_get(THIS_MODULE);
2099
2100 if (dev->attached) {
2101 if (!try_module_get(dev->driver->module)) {
2102 module_put(THIS_MODULE);
2103 mutex_unlock(&dev->mutex);
2104 return -ENOSYS;
2105 }
2106 }
2107
2108 if (dev->attached && dev->use_count == 0 && dev->open) {
2109 int rc = dev->open(dev);
2110 if (rc < 0) {
2111 module_put(dev->driver->module);
2112 module_put(THIS_MODULE);
2113 mutex_unlock(&dev->mutex);
2114 return rc;
2115 }
2116 }
2117
2118 dev->use_count++;
2119
2120 mutex_unlock(&dev->mutex);
2121
2122 return 0;
2123 }
2124
2125 static int comedi_close(struct inode *inode, struct file *file)
2126 {
2127 const unsigned minor = iminor(inode);
2128 struct comedi_subdevice *s = NULL;
2129 int i;
2130 struct comedi_device_file_info *dev_file_info;
2131 struct comedi_device *dev;
2132 dev_file_info = comedi_get_device_file_info(minor);
2133
2134 if (dev_file_info == NULL)
2135 return -ENODEV;
2136 dev = dev_file_info->device;
2137 if (dev == NULL)
2138 return -ENODEV;
2139
2140 mutex_lock(&dev->mutex);
2141
2142 if (dev->subdevices) {
2143 for (i = 0; i < dev->n_subdevices; i++) {
2144 s = &dev->subdevices[i];
2145
2146 if (s->busy == file)
2147 do_cancel(dev, s);
2148 if (s->lock == file)
2149 s->lock = NULL;
2150 }
2151 }
2152 if (dev->attached && dev->use_count == 1 && dev->close)
2153 dev->close(dev);
2154
2155 module_put(THIS_MODULE);
2156 if (dev->attached)
2157 module_put(dev->driver->module);
2158
2159 dev->use_count--;
2160
2161 mutex_unlock(&dev->mutex);
2162
2163 if (file->f_flags & FASYNC)
2164 comedi_fasync(-1, file, 0);
2165
2166 return 0;
2167 }
2168
2169 static int comedi_fasync(int fd, struct file *file, int on)
2170 {
2171 const unsigned minor = iminor(file->f_dentry->d_inode);
2172 struct comedi_device_file_info *dev_file_info;
2173 struct comedi_device *dev;
2174 dev_file_info = comedi_get_device_file_info(minor);
2175
2176 if (dev_file_info == NULL)
2177 return -ENODEV;
2178 dev = dev_file_info->device;
2179 if (dev == NULL)
2180 return -ENODEV;
2181
2182 return fasync_helper(fd, file, on, &dev->async_queue);
2183 }
2184
2185 static const struct file_operations comedi_fops = {
2186 .owner = THIS_MODULE,
2187 .unlocked_ioctl = comedi_unlocked_ioctl,
2188 .compat_ioctl = comedi_compat_ioctl,
2189 .open = comedi_open,
2190 .release = comedi_close,
2191 .read = comedi_read,
2192 .write = comedi_write,
2193 .mmap = comedi_mmap,
2194 .poll = comedi_poll,
2195 .fasync = comedi_fasync,
2196 .llseek = noop_llseek,
2197 };
2198
2199 static struct class *comedi_class;
2200 static struct cdev comedi_cdev;
2201
2202 static void comedi_cleanup_legacy_minors(void)
2203 {
2204 unsigned i;
2205
2206 for (i = 0; i < comedi_num_legacy_minors; i++)
2207 comedi_free_board_minor(i);
2208 }
2209
2210 static int __init comedi_init(void)
2211 {
2212 int i;
2213 int retval;
2214
2215 pr_info("comedi: version " COMEDI_RELEASE " - http://www.comedi.org\n");
2216
2217 if (comedi_num_legacy_minors < 0 ||
2218 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
2219 pr_err("comedi: error: invalid value for module parameter \"comedi_num_legacy_minors\". Valid values are 0 through %i.\n",
2220 COMEDI_NUM_BOARD_MINORS);
2221 return -EINVAL;
2222 }
2223
2224 /*
2225 * comedi is unusable if both comedi_autoconfig and
2226 * comedi_num_legacy_minors are zero, so we might as well adjust the
2227 * defaults in that case
2228 */
2229 if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0)
2230 comedi_num_legacy_minors = 16;
2231
2232 memset(comedi_file_info_table, 0,
2233 sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS);
2234
2235 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2236 COMEDI_NUM_MINORS, "comedi");
2237 if (retval)
2238 return -EIO;
2239 cdev_init(&comedi_cdev, &comedi_fops);
2240 comedi_cdev.owner = THIS_MODULE;
2241 kobject_set_name(&comedi_cdev.kobj, "comedi");
2242 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
2243 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2244 COMEDI_NUM_MINORS);
2245 return -EIO;
2246 }
2247 comedi_class = class_create(THIS_MODULE, "comedi");
2248 if (IS_ERR(comedi_class)) {
2249 pr_err("comedi: failed to create class\n");
2250 cdev_del(&comedi_cdev);
2251 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2252 COMEDI_NUM_MINORS);
2253 return PTR_ERR(comedi_class);
2254 }
2255
2256 comedi_class->dev_attrs = comedi_dev_attrs;
2257
2258 /* XXX requires /proc interface */
2259 comedi_proc_init();
2260
2261 /* create devices files for legacy/manual use */
2262 for (i = 0; i < comedi_num_legacy_minors; i++) {
2263 int minor;
2264 minor = comedi_alloc_board_minor(NULL);
2265 if (minor < 0) {
2266 comedi_cleanup_legacy_minors();
2267 cdev_del(&comedi_cdev);
2268 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
2269 COMEDI_NUM_MINORS);
2270 return minor;
2271 }
2272 }
2273
2274 return 0;
2275 }
2276
2277 static void __exit comedi_cleanup(void)
2278 {
2279 int i;
2280
2281 comedi_cleanup_legacy_minors();
2282 for (i = 0; i < COMEDI_NUM_MINORS; ++i)
2283 BUG_ON(comedi_file_info_table[i]);
2284
2285 class_destroy(comedi_class);
2286 cdev_del(&comedi_cdev);
2287 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
2288
2289 comedi_proc_cleanup();
2290 }
2291
2292 module_init(comedi_init);
2293 module_exit(comedi_cleanup);
2294
2295 void comedi_error(const struct comedi_device *dev, const char *s)
2296 {
2297 dev_err(dev->class_dev, "%s: %s\n", dev->driver->driver_name, s);
2298 }
2299 EXPORT_SYMBOL(comedi_error);
2300
2301 void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
2302 {
2303 struct comedi_async *async = s->async;
2304 unsigned runflags = 0;
2305 unsigned runflags_mask = 0;
2306
2307 /* DPRINTK("comedi_event 0x%x\n",mask); */
2308
2309 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0)
2310 return;
2311
2312 if (s->
2313 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR |
2314 COMEDI_CB_OVERFLOW)) {
2315 runflags_mask |= SRF_RUNNING;
2316 }
2317 /* remember if an error event has occurred, so an error
2318 * can be returned the next time the user does a read() */
2319 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
2320 runflags_mask |= SRF_ERROR;
2321 runflags |= SRF_ERROR;
2322 }
2323 if (runflags_mask) {
2324 /*sets SRF_ERROR and SRF_RUNNING together atomically */
2325 comedi_set_subdevice_runflags(s, runflags_mask, runflags);
2326 }
2327
2328 if (async->cb_mask & s->async->events) {
2329 if (comedi_get_subdevice_runflags(s) & SRF_USER) {
2330 wake_up_interruptible(&async->wait_head);
2331 if (s->subdev_flags & SDF_CMD_READ)
2332 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
2333 if (s->subdev_flags & SDF_CMD_WRITE)
2334 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT);
2335 } else {
2336 if (async->cb_func)
2337 async->cb_func(s->async->events, async->cb_arg);
2338 }
2339 }
2340 s->async->events = 0;
2341 }
2342 EXPORT_SYMBOL(comedi_event);
2343
2344 unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s)
2345 {
2346 unsigned long flags;
2347 unsigned runflags;
2348
2349 spin_lock_irqsave(&s->spin_lock, flags);
2350 runflags = s->runflags;
2351 spin_unlock_irqrestore(&s->spin_lock, flags);
2352 return runflags;
2353 }
2354 EXPORT_SYMBOL(comedi_get_subdevice_runflags);
2355
2356 static int is_device_busy(struct comedi_device *dev)
2357 {
2358 struct comedi_subdevice *s;
2359 int i;
2360
2361 if (!dev->attached)
2362 return 0;
2363
2364 for (i = 0; i < dev->n_subdevices; i++) {
2365 s = &dev->subdevices[i];
2366 if (s->busy)
2367 return 1;
2368 if (s->async && s->async->mmap_count)
2369 return 1;
2370 }
2371
2372 return 0;
2373 }
2374
2375 static void comedi_device_init(struct comedi_device *dev)
2376 {
2377 memset(dev, 0, sizeof(struct comedi_device));
2378 spin_lock_init(&dev->spinlock);
2379 mutex_init(&dev->mutex);
2380 dev->minor = -1;
2381 }
2382
2383 static void comedi_device_cleanup(struct comedi_device *dev)
2384 {
2385 if (dev == NULL)
2386 return;
2387 mutex_lock(&dev->mutex);
2388 comedi_device_detach(dev);
2389 mutex_unlock(&dev->mutex);
2390 mutex_destroy(&dev->mutex);
2391 }
2392
2393 int comedi_alloc_board_minor(struct device *hardware_device)
2394 {
2395 struct comedi_device_file_info *info;
2396 struct device *csdev;
2397 unsigned i;
2398
2399 info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
2400 if (info == NULL)
2401 return -ENOMEM;
2402 info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL);
2403 if (info->device == NULL) {
2404 kfree(info);
2405 return -ENOMEM;
2406 }
2407 info->hardware_device = hardware_device;
2408 comedi_device_init(info->device);
2409 spin_lock(&comedi_file_info_table_lock);
2410 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) {
2411 if (comedi_file_info_table[i] == NULL) {
2412 comedi_file_info_table[i] = info;
2413 break;
2414 }
2415 }
2416 spin_unlock(&comedi_file_info_table_lock);
2417 if (i == COMEDI_NUM_BOARD_MINORS) {
2418 comedi_device_cleanup(info->device);
2419 kfree(info->device);
2420 kfree(info);
2421 pr_err("comedi: error: ran out of minor numbers for board device files.\n");
2422 return -EBUSY;
2423 }
2424 info->device->minor = i;
2425 csdev = device_create(comedi_class, hardware_device,
2426 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i", i);
2427 if (!IS_ERR(csdev))
2428 info->device->class_dev = csdev;
2429 dev_set_drvdata(csdev, info);
2430
2431 return i;
2432 }
2433
2434 void comedi_free_board_minor(unsigned minor)
2435 {
2436 struct comedi_device_file_info *info;
2437
2438 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
2439 spin_lock(&comedi_file_info_table_lock);
2440 info = comedi_file_info_table[minor];
2441 comedi_file_info_table[minor] = NULL;
2442 spin_unlock(&comedi_file_info_table_lock);
2443
2444 if (info) {
2445 struct comedi_device *dev = info->device;
2446 if (dev) {
2447 if (dev->class_dev) {
2448 device_destroy(comedi_class,
2449 MKDEV(COMEDI_MAJOR, dev->minor));
2450 }
2451 comedi_device_cleanup(dev);
2452 kfree(dev);
2453 }
2454 kfree(info);
2455 }
2456 }
2457
2458 int comedi_find_board_minor(struct device *hardware_device)
2459 {
2460 int minor;
2461 struct comedi_device_file_info *info;
2462
2463 for (minor = 0; minor < COMEDI_NUM_BOARD_MINORS; minor++) {
2464 spin_lock(&comedi_file_info_table_lock);
2465 info = comedi_file_info_table[minor];
2466 if (info && info->hardware_device == hardware_device) {
2467 spin_unlock(&comedi_file_info_table_lock);
2468 return minor;
2469 }
2470 spin_unlock(&comedi_file_info_table_lock);
2471 }
2472 return -ENODEV;
2473 }
2474
2475 int comedi_alloc_subdevice_minor(struct comedi_device *dev,
2476 struct comedi_subdevice *s)
2477 {
2478 struct comedi_device_file_info *info;
2479 struct device *csdev;
2480 unsigned i;
2481
2482 info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
2483 if (info == NULL)
2484 return -ENOMEM;
2485 info->device = dev;
2486 info->read_subdevice = s;
2487 info->write_subdevice = s;
2488 spin_lock(&comedi_file_info_table_lock);
2489 for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) {
2490 if (comedi_file_info_table[i] == NULL) {
2491 comedi_file_info_table[i] = info;
2492 break;
2493 }
2494 }
2495 spin_unlock(&comedi_file_info_table_lock);
2496 if (i == COMEDI_NUM_MINORS) {
2497 kfree(info);
2498 pr_err("comedi: error: ran out of minor numbers for board device files.\n");
2499 return -EBUSY;
2500 }
2501 s->minor = i;
2502 csdev = device_create(comedi_class, dev->class_dev,
2503 MKDEV(COMEDI_MAJOR, i), NULL, "comedi%i_subd%i",
2504 dev->minor, (int)(s - dev->subdevices));
2505 if (!IS_ERR(csdev))
2506 s->class_dev = csdev;
2507 dev_set_drvdata(csdev, info);
2508
2509 return i;
2510 }
2511
2512 void comedi_free_subdevice_minor(struct comedi_subdevice *s)
2513 {
2514 struct comedi_device_file_info *info;
2515
2516 if (s == NULL)
2517 return;
2518 if (s->minor < 0)
2519 return;
2520
2521 BUG_ON(s->minor >= COMEDI_NUM_MINORS);
2522 BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR);
2523
2524 spin_lock(&comedi_file_info_table_lock);
2525 info = comedi_file_info_table[s->minor];
2526 comedi_file_info_table[s->minor] = NULL;
2527 spin_unlock(&comedi_file_info_table_lock);
2528
2529 if (s->class_dev) {
2530 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
2531 s->class_dev = NULL;
2532 }
2533 kfree(info);
2534 }
2535
2536 struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor)
2537 {
2538 struct comedi_device_file_info *info;
2539
2540 BUG_ON(minor >= COMEDI_NUM_MINORS);
2541 spin_lock(&comedi_file_info_table_lock);
2542 info = comedi_file_info_table[minor];
2543 spin_unlock(&comedi_file_info_table_lock);
2544 return info;
2545 }
2546 EXPORT_SYMBOL_GPL(comedi_get_device_file_info);
Linux kernel - Deliverables
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