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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/vapier...
[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_fops.h"
28 #include "comedi_compat32.h"
29
30 #include <linux/module.h>
31 #include <linux/errno.h>
32 #include <linux/kernel.h>
33 #include <linux/sched.h>
34 #include <linux/fcntl.h>
35 #include <linux/delay.h>
36 #include <linux/ioport.h>
37 #include <linux/mm.h>
38 #include <linux/slab.h>
39 #include <linux/kmod.h>
40 #include <linux/poll.h>
41 #include <linux/init.h>
42 #include <linux/device.h>
43 #include <linux/vmalloc.h>
44 #include <linux/fs.h>
45 #include "comedidev.h"
46 #include <linux/cdev.h>
47 #include <linux/stat.h>
48
49 #include <linux/io.h>
50 #include <linux/uaccess.h>
51
52 #include "internal.h"
53
54 MODULE_AUTHOR("http://www.comedi.org");
55 MODULE_DESCRIPTION("Comedi core module");
56 MODULE_LICENSE("GPL");
57
58 #ifdef CONFIG_COMEDI_DEBUG
59 int comedi_debug;
60 EXPORT_SYMBOL(comedi_debug);
61 module_param(comedi_debug, int, 0644);
62 #endif
63
64 int comedi_autoconfig = 1;
65 module_param(comedi_autoconfig, bool, 0444);
66
67 static int comedi_num_legacy_minors;
68 module_param(comedi_num_legacy_minors, int, 0444);
69
70 static DEFINE_SPINLOCK(comedi_file_info_table_lock);
71 static struct comedi_device_file_info
72 *comedi_file_info_table[COMEDI_NUM_MINORS];
73
74 static int do_devconfig_ioctl(struct comedi_device *dev,
75 struct comedi_devconfig __user *arg);
76 static int do_bufconfig_ioctl(struct comedi_device *dev,
77 struct comedi_bufconfig __user *arg);
78 static int do_devinfo_ioctl(struct comedi_device *dev,
79 struct comedi_devinfo __user *arg,
80 struct file *file);
81 static int do_subdinfo_ioctl(struct comedi_device *dev,
82 struct comedi_subdinfo __user *arg, void *file);
83 static int do_chaninfo_ioctl(struct comedi_device *dev,
84 struct comedi_chaninfo __user *arg);
85 static int do_bufinfo_ioctl(struct comedi_device *dev,
86 struct comedi_bufinfo __user *arg, void *file);
87 static int do_cmd_ioctl(struct comedi_device *dev,
88 struct comedi_cmd __user *arg, void *file);
89 static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
90 void *file);
91 static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
92 void *file);
93 static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
94 void *file);
95 static int do_cmdtest_ioctl(struct comedi_device *dev,
96 struct comedi_cmd __user *arg, void *file);
97 static int do_insnlist_ioctl(struct comedi_device *dev,
98 struct comedi_insnlist __user *arg, void *file);
99 static int do_insn_ioctl(struct comedi_device *dev,
100 struct comedi_insn __user *arg, void *file);
101 static int do_poll_ioctl(struct comedi_device *dev, unsigned int subd,
102 void *file);
103
104 extern void do_become_nonbusy(struct comedi_device *dev,
105 struct comedi_subdevice *s);
106 static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
107
108 static int comedi_fasync(int fd, struct file *file, int on);
109
110 static int is_device_busy(struct comedi_device *dev);
111 static int resize_async_buffer(struct comedi_device *dev,
112 struct comedi_subdevice *s,
113 struct comedi_async *async, unsigned new_size);
114
115 /* declarations for sysfs attribute files */
116 static struct device_attribute dev_attr_max_read_buffer_kb;
117 static struct device_attribute dev_attr_read_buffer_kb;
118 static struct device_attribute dev_attr_max_write_buffer_kb;
119 static struct device_attribute dev_attr_write_buffer_kb;
120
121 static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
122 unsigned long arg)
123 {
124 const unsigned minor = iminor(file->f_dentry->d_inode);
125 struct comedi_device_file_info *dev_file_info =
126 comedi_get_device_file_info(minor);
127 struct comedi_device *dev;
128 int rc;
129
130 if (dev_file_info == NULL || dev_file_info->device == NULL)
131 return -ENODEV;
132 dev = dev_file_info->device;
133
134 mutex_lock(&dev->mutex);
135
136 /* Device config is special, because it must work on
137 * an unconfigured device. */
138 if (cmd == COMEDI_DEVCONFIG) {
139 rc = do_devconfig_ioctl(dev,
140 (struct comedi_devconfig __user *)arg);
141 goto done;
142 }
143
144 if (!dev->attached) {
145 DPRINTK("no driver configured on /dev/comedi%i\n", dev->minor);
146 rc = -ENODEV;
147 goto done;
148 }
149
150 switch (cmd) {
151 case COMEDI_BUFCONFIG:
152 rc = do_bufconfig_ioctl(dev,
153 (struct comedi_bufconfig __user *)arg);
154 break;
155 case COMEDI_DEVINFO:
156 rc = do_devinfo_ioctl(dev, (struct comedi_devinfo __user *)arg,
157 file);
158 break;
159 case COMEDI_SUBDINFO:
160 rc = do_subdinfo_ioctl(dev,
161 (struct comedi_subdinfo __user *)arg,
162 file);
163 break;
164 case COMEDI_CHANINFO:
165 rc = do_chaninfo_ioctl(dev, (void __user *)arg);
166 break;
167 case COMEDI_RANGEINFO:
168 rc = do_rangeinfo_ioctl(dev, (void __user *)arg);
169 break;
170 case COMEDI_BUFINFO:
171 rc = do_bufinfo_ioctl(dev,
172 (struct comedi_bufinfo __user *)arg,
173 file);
174 break;
175 case COMEDI_LOCK:
176 rc = do_lock_ioctl(dev, arg, file);
177 break;
178 case COMEDI_UNLOCK:
179 rc = do_unlock_ioctl(dev, arg, file);
180 break;
181 case COMEDI_CANCEL:
182 rc = do_cancel_ioctl(dev, arg, file);
183 break;
184 case COMEDI_CMD:
185 rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file);
186 break;
187 case COMEDI_CMDTEST:
188 rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg,
189 file);
190 break;
191 case COMEDI_INSNLIST:
192 rc = do_insnlist_ioctl(dev,
193 (struct comedi_insnlist __user *)arg,
194 file);
195 break;
196 case COMEDI_INSN:
197 rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg,
198 file);
199 break;
200 case COMEDI_POLL:
201 rc = do_poll_ioctl(dev, arg, file);
202 break;
203 default:
204 rc = -ENOTTY;
205 break;
206 }
207
208 done:
209 mutex_unlock(&dev->mutex);
210 return rc;
211 }
212
213 /*
214 COMEDI_DEVCONFIG
215 device config ioctl
216
217 arg:
218 pointer to devconfig structure
219
220 reads:
221 devconfig structure at arg
222
223 writes:
224 none
225 */
226 static int do_devconfig_ioctl(struct comedi_device *dev,
227 struct comedi_devconfig __user *arg)
228 {
229 struct comedi_devconfig it;
230 int ret;
231 unsigned char *aux_data = NULL;
232 int aux_len;
233
234 if (!capable(CAP_SYS_ADMIN))
235 return -EPERM;
236
237 if (arg == NULL) {
238 if (is_device_busy(dev))
239 return -EBUSY;
240 if (dev->attached) {
241 struct module *driver_module = dev->driver->module;
242 comedi_device_detach(dev);
243 module_put(driver_module);
244 }
245 return 0;
246 }
247
248 if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig)))
249 return -EFAULT;
250
251 it.board_name[COMEDI_NAMELEN - 1] = 0;
252
253 if (comedi_aux_data(it.options, 0) &&
254 it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
255 int bit_shift;
256 aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH];
257 if (aux_len < 0)
258 return -EFAULT;
259
260 aux_data = vmalloc(aux_len);
261 if (!aux_data)
262 return -ENOMEM;
263
264 if (copy_from_user(aux_data,
265 comedi_aux_data(it.options, 0), aux_len)) {
266 vfree(aux_data);
267 return -EFAULT;
268 }
269 it.options[COMEDI_DEVCONF_AUX_DATA_LO] =
270 (unsigned long)aux_data;
271 if (sizeof(void *) > sizeof(int)) {
272 bit_shift = sizeof(int) * 8;
273 it.options[COMEDI_DEVCONF_AUX_DATA_HI] =
274 ((unsigned long)aux_data) >> bit_shift;
275 } else
276 it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0;
277 }
278
279 ret = comedi_device_attach(dev, &it);
280 if (ret == 0) {
281 if (!try_module_get(dev->driver->module)) {
282 comedi_device_detach(dev);
283 return -ENOSYS;
284 }
285 }
286
287 if (aux_data)
288 vfree(aux_data);
289
290 return ret;
291 }
292
293 /*
294 COMEDI_BUFCONFIG
295 buffer configuration ioctl
296
297 arg:
298 pointer to bufconfig structure
299
300 reads:
301 bufconfig at arg
302
303 writes:
304 modified bufconfig at arg
305
306 */
307 static int do_bufconfig_ioctl(struct comedi_device *dev,
308 struct comedi_bufconfig __user *arg)
309 {
310 struct comedi_bufconfig bc;
311 struct comedi_async *async;
312 struct comedi_subdevice *s;
313 int retval = 0;
314
315 if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig)))
316 return -EFAULT;
317
318 if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0)
319 return -EINVAL;
320
321 s = dev->subdevices + bc.subdevice;
322 async = s->async;
323
324 if (!async) {
325 DPRINTK("subdevice does not have async capability\n");
326 bc.size = 0;
327 bc.maximum_size = 0;
328 goto copyback;
329 }
330
331 if (bc.maximum_size) {
332 if (!capable(CAP_SYS_ADMIN))
333 return -EPERM;
334
335 async->max_bufsize = bc.maximum_size;
336 }
337
338 if (bc.size) {
339 retval = resize_async_buffer(dev, s, async, bc.size);
340 if (retval < 0)
341 return retval;
342 }
343
344 bc.size = async->prealloc_bufsz;
345 bc.maximum_size = async->max_bufsize;
346
347 copyback:
348 if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig)))
349 return -EFAULT;
350
351 return 0;
352 }
353
354 /*
355 COMEDI_DEVINFO
356 device info ioctl
357
358 arg:
359 pointer to devinfo structure
360
361 reads:
362 none
363
364 writes:
365 devinfo structure
366
367 */
368 static int do_devinfo_ioctl(struct comedi_device *dev,
369 struct comedi_devinfo __user *arg,
370 struct file *file)
371 {
372 struct comedi_devinfo devinfo;
373 const unsigned minor = iminor(file->f_dentry->d_inode);
374 struct comedi_device_file_info *dev_file_info =
375 comedi_get_device_file_info(minor);
376 struct comedi_subdevice *read_subdev =
377 comedi_get_read_subdevice(dev_file_info);
378 struct comedi_subdevice *write_subdev =
379 comedi_get_write_subdevice(dev_file_info);
380
381 memset(&devinfo, 0, sizeof(devinfo));
382
383 /* fill devinfo structure */
384 devinfo.version_code = COMEDI_VERSION_CODE;
385 devinfo.n_subdevs = dev->n_subdevices;
386 memcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
387 memcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
388
389 if (read_subdev)
390 devinfo.read_subdevice = read_subdev - dev->subdevices;
391 else
392 devinfo.read_subdevice = -1;
393
394 if (write_subdev)
395 devinfo.write_subdevice = write_subdev - dev->subdevices;
396 else
397 devinfo.write_subdevice = -1;
398
399 if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo)))
400 return -EFAULT;
401
402 return 0;
403 }
404
405 /*
406 COMEDI_SUBDINFO
407 subdevice info ioctl
408
409 arg:
410 pointer to array of subdevice info structures
411
412 reads:
413 none
414
415 writes:
416 array of subdevice info structures at arg
417
418 */
419 static int do_subdinfo_ioctl(struct comedi_device *dev,
420 struct comedi_subdinfo __user *arg, void *file)
421 {
422 int ret, i;
423 struct comedi_subdinfo *tmp, *us;
424 struct comedi_subdevice *s;
425
426 tmp =
427 kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo),
428 GFP_KERNEL);
429 if (!tmp)
430 return -ENOMEM;
431
432 /* fill subdinfo structs */
433 for (i = 0; i < dev->n_subdevices; i++) {
434 s = dev->subdevices + i;
435 us = tmp + i;
436
437 us->type = s->type;
438 us->n_chan = s->n_chan;
439 us->subd_flags = s->subdev_flags;
440 if (comedi_get_subdevice_runflags(s) & SRF_RUNNING)
441 us->subd_flags |= SDF_RUNNING;
442 #define TIMER_nanosec 5 /* backwards compatibility */
443 us->timer_type = TIMER_nanosec;
444 us->len_chanlist = s->len_chanlist;
445 us->maxdata = s->maxdata;
446 if (s->range_table) {
447 us->range_type =
448 (i << 24) | (0 << 16) | (s->range_table->length);
449 } else {
450 us->range_type = 0; /* XXX */
451 }
452 us->flags = s->flags;
453
454 if (s->busy)
455 us->subd_flags |= SDF_BUSY;
456 if (s->busy == file)
457 us->subd_flags |= SDF_BUSY_OWNER;
458 if (s->lock)
459 us->subd_flags |= SDF_LOCKED;
460 if (s->lock == file)
461 us->subd_flags |= SDF_LOCK_OWNER;
462 if (!s->maxdata && s->maxdata_list)
463 us->subd_flags |= SDF_MAXDATA;
464 if (s->flaglist)
465 us->subd_flags |= SDF_FLAGS;
466 if (s->range_table_list)
467 us->subd_flags |= SDF_RANGETYPE;
468 if (s->do_cmd)
469 us->subd_flags |= SDF_CMD;
470
471 if (s->insn_bits != &insn_inval)
472 us->insn_bits_support = COMEDI_SUPPORTED;
473 else
474 us->insn_bits_support = COMEDI_UNSUPPORTED;
475
476 us->settling_time_0 = s->settling_time_0;
477 }
478
479 ret = copy_to_user(arg, tmp,
480 dev->n_subdevices * sizeof(struct comedi_subdinfo));
481
482 kfree(tmp);
483
484 return ret ? -EFAULT : 0;
485 }
486
487 /*
488 COMEDI_CHANINFO
489 subdevice info ioctl
490
491 arg:
492 pointer to chaninfo structure
493
494 reads:
495 chaninfo structure at arg
496
497 writes:
498 arrays at elements of chaninfo structure
499
500 */
501 static int do_chaninfo_ioctl(struct comedi_device *dev,
502 struct comedi_chaninfo __user *arg)
503 {
504 struct comedi_subdevice *s;
505 struct comedi_chaninfo it;
506
507 if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo)))
508 return -EFAULT;
509
510 if (it.subdev >= dev->n_subdevices)
511 return -EINVAL;
512 s = dev->subdevices + it.subdev;
513
514 if (it.maxdata_list) {
515 if (s->maxdata || !s->maxdata_list)
516 return -EINVAL;
517 if (copy_to_user(it.maxdata_list, s->maxdata_list,
518 s->n_chan * sizeof(unsigned int)))
519 return -EFAULT;
520 }
521
522 if (it.flaglist) {
523 if (!s->flaglist)
524 return -EINVAL;
525 if (copy_to_user(it.flaglist, s->flaglist,
526 s->n_chan * sizeof(unsigned int)))
527 return -EFAULT;
528 }
529
530 if (it.rangelist) {
531 int i;
532
533 if (!s->range_table_list)
534 return -EINVAL;
535 for (i = 0; i < s->n_chan; i++) {
536 int x;
537
538 x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
539 (s->range_table_list[i]->length);
540 put_user(x, it.rangelist + i);
541 }
542 #if 0
543 if (copy_to_user(it.rangelist, s->range_type_list,
544 s->n_chan * sizeof(unsigned int)))
545 return -EFAULT;
546 #endif
547 }
548
549 return 0;
550 }
551
552 /*
553 COMEDI_BUFINFO
554 buffer information ioctl
555
556 arg:
557 pointer to bufinfo structure
558
559 reads:
560 bufinfo at arg
561
562 writes:
563 modified bufinfo at arg
564
565 */
566 static int do_bufinfo_ioctl(struct comedi_device *dev,
567 struct comedi_bufinfo __user *arg, void *file)
568 {
569 struct comedi_bufinfo bi;
570 struct comedi_subdevice *s;
571 struct comedi_async *async;
572
573 if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo)))
574 return -EFAULT;
575
576 if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0)
577 return -EINVAL;
578
579 s = dev->subdevices + bi.subdevice;
580
581 if (s->lock && s->lock != file)
582 return -EACCES;
583
584 async = s->async;
585
586 if (!async) {
587 DPRINTK("subdevice does not have async capability\n");
588 bi.buf_write_ptr = 0;
589 bi.buf_read_ptr = 0;
590 bi.buf_write_count = 0;
591 bi.buf_read_count = 0;
592 bi.bytes_read = 0;
593 bi.bytes_written = 0;
594 goto copyback;
595 }
596 if (!s->busy) {
597 bi.bytes_read = 0;
598 bi.bytes_written = 0;
599 goto copyback_position;
600 }
601 if (s->busy != file)
602 return -EACCES;
603
604 if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) {
605 bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read);
606 comedi_buf_read_free(async, bi.bytes_read);
607
608 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR |
609 SRF_RUNNING))
610 && async->buf_write_count == async->buf_read_count) {
611 do_become_nonbusy(dev, s);
612 }
613 }
614
615 if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) {
616 bi.bytes_written =
617 comedi_buf_write_alloc(async, bi.bytes_written);
618 comedi_buf_write_free(async, bi.bytes_written);
619 }
620
621 copyback_position:
622 bi.buf_write_count = async->buf_write_count;
623 bi.buf_write_ptr = async->buf_write_ptr;
624 bi.buf_read_count = async->buf_read_count;
625 bi.buf_read_ptr = async->buf_read_ptr;
626
627 copyback:
628 if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo)))
629 return -EFAULT;
630
631 return 0;
632 }
633
634 static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
635 unsigned int *data, void *file);
636 /*
637 * COMEDI_INSNLIST
638 * synchronous instructions
639 *
640 * arg:
641 * pointer to sync cmd structure
642 *
643 * reads:
644 * sync cmd struct at arg
645 * instruction list
646 * data (for writes)
647 *
648 * writes:
649 * data (for reads)
650 */
651 /* arbitrary limits */
652 #define MAX_SAMPLES 256
653 static int do_insnlist_ioctl(struct comedi_device *dev,
654 struct comedi_insnlist __user *arg, void *file)
655 {
656 struct comedi_insnlist insnlist;
657 struct comedi_insn *insns = NULL;
658 unsigned int *data = NULL;
659 int i = 0;
660 int ret = 0;
661
662 if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist)))
663 return -EFAULT;
664
665 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
666 if (!data) {
667 DPRINTK("kmalloc failed\n");
668 ret = -ENOMEM;
669 goto error;
670 }
671
672 insns =
673 kmalloc(sizeof(struct comedi_insn) * insnlist.n_insns, GFP_KERNEL);
674 if (!insns) {
675 DPRINTK("kmalloc failed\n");
676 ret = -ENOMEM;
677 goto error;
678 }
679
680 if (copy_from_user(insns, insnlist.insns,
681 sizeof(struct comedi_insn) * insnlist.n_insns)) {
682 DPRINTK("copy_from_user failed\n");
683 ret = -EFAULT;
684 goto error;
685 }
686
687 for (i = 0; i < insnlist.n_insns; i++) {
688 if (insns[i].n > MAX_SAMPLES) {
689 DPRINTK("number of samples too large\n");
690 ret = -EINVAL;
691 goto error;
692 }
693 if (insns[i].insn & INSN_MASK_WRITE) {
694 if (copy_from_user(data, insns[i].data,
695 insns[i].n * sizeof(unsigned int))) {
696 DPRINTK("copy_from_user failed\n");
697 ret = -EFAULT;
698 goto error;
699 }
700 }
701 ret = parse_insn(dev, insns + i, data, file);
702 if (ret < 0)
703 goto error;
704 if (insns[i].insn & INSN_MASK_READ) {
705 if (copy_to_user(insns[i].data, data,
706 insns[i].n * sizeof(unsigned int))) {
707 DPRINTK("copy_to_user failed\n");
708 ret = -EFAULT;
709 goto error;
710 }
711 }
712 if (need_resched())
713 schedule();
714 }
715
716 error:
717 kfree(insns);
718 kfree(data);
719
720 if (ret < 0)
721 return ret;
722 return i;
723 }
724
725 static int check_insn_config_length(struct comedi_insn *insn,
726 unsigned int *data)
727 {
728 if (insn->n < 1)
729 return -EINVAL;
730
731 switch (data[0]) {
732 case INSN_CONFIG_DIO_OUTPUT:
733 case INSN_CONFIG_DIO_INPUT:
734 case INSN_CONFIG_DISARM:
735 case INSN_CONFIG_RESET:
736 if (insn->n == 1)
737 return 0;
738 break;
739 case INSN_CONFIG_ARM:
740 case INSN_CONFIG_DIO_QUERY:
741 case INSN_CONFIG_BLOCK_SIZE:
742 case INSN_CONFIG_FILTER:
743 case INSN_CONFIG_SERIAL_CLOCK:
744 case INSN_CONFIG_BIDIRECTIONAL_DATA:
745 case INSN_CONFIG_ALT_SOURCE:
746 case INSN_CONFIG_SET_COUNTER_MODE:
747 case INSN_CONFIG_8254_READ_STATUS:
748 case INSN_CONFIG_SET_ROUTING:
749 case INSN_CONFIG_GET_ROUTING:
750 case INSN_CONFIG_GET_PWM_STATUS:
751 case INSN_CONFIG_PWM_SET_PERIOD:
752 case INSN_CONFIG_PWM_GET_PERIOD:
753 if (insn->n == 2)
754 return 0;
755 break;
756 case INSN_CONFIG_SET_GATE_SRC:
757 case INSN_CONFIG_GET_GATE_SRC:
758 case INSN_CONFIG_SET_CLOCK_SRC:
759 case INSN_CONFIG_GET_CLOCK_SRC:
760 case INSN_CONFIG_SET_OTHER_SRC:
761 case INSN_CONFIG_GET_COUNTER_STATUS:
762 case INSN_CONFIG_PWM_SET_H_BRIDGE:
763 case INSN_CONFIG_PWM_GET_H_BRIDGE:
764 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE:
765 if (insn->n == 3)
766 return 0;
767 break;
768 case INSN_CONFIG_PWM_OUTPUT:
769 case INSN_CONFIG_ANALOG_TRIG:
770 if (insn->n == 5)
771 return 0;
772 break;
773 /* by default we allow the insn since we don't have checks for
774 * all possible cases yet */
775 default:
776 printk(KERN_WARNING
777 "comedi: no check for data length of config insn id "
778 "%i is implemented.\n"
779 " Add a check to %s in %s.\n"
780 " Assuming n=%i is correct.\n", data[0], __func__,
781 __FILE__, insn->n);
782 return 0;
783 break;
784 }
785 return -EINVAL;
786 }
787
788 static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
789 unsigned int *data, void *file)
790 {
791 struct comedi_subdevice *s;
792 int ret = 0;
793 int i;
794
795 if (insn->insn & INSN_MASK_SPECIAL) {
796 /* a non-subdevice instruction */
797
798 switch (insn->insn) {
799 case INSN_GTOD:
800 {
801 struct timeval tv;
802
803 if (insn->n != 2) {
804 ret = -EINVAL;
805 break;
806 }
807
808 do_gettimeofday(&tv);
809 data[0] = tv.tv_sec;
810 data[1] = tv.tv_usec;
811 ret = 2;
812
813 break;
814 }
815 case INSN_WAIT:
816 if (insn->n != 1 || data[0] >= 100000) {
817 ret = -EINVAL;
818 break;
819 }
820 udelay(data[0] / 1000);
821 ret = 1;
822 break;
823 case INSN_INTTRIG:
824 if (insn->n != 1) {
825 ret = -EINVAL;
826 break;
827 }
828 if (insn->subdev >= dev->n_subdevices) {
829 DPRINTK("%d not usable subdevice\n",
830 insn->subdev);
831 ret = -EINVAL;
832 break;
833 }
834 s = dev->subdevices + insn->subdev;
835 if (!s->async) {
836 DPRINTK("no async\n");
837 ret = -EINVAL;
838 break;
839 }
840 if (!s->async->inttrig) {
841 DPRINTK("no inttrig\n");
842 ret = -EAGAIN;
843 break;
844 }
845 ret = s->async->inttrig(dev, s, insn->data[0]);
846 if (ret >= 0)
847 ret = 1;
848 break;
849 default:
850 DPRINTK("invalid insn\n");
851 ret = -EINVAL;
852 break;
853 }
854 } else {
855 /* a subdevice instruction */
856 unsigned int maxdata;
857
858 if (insn->subdev >= dev->n_subdevices) {
859 DPRINTK("subdevice %d out of range\n", insn->subdev);
860 ret = -EINVAL;
861 goto out;
862 }
863 s = dev->subdevices + insn->subdev;
864
865 if (s->type == COMEDI_SUBD_UNUSED) {
866 DPRINTK("%d not usable subdevice\n", insn->subdev);
867 ret = -EIO;
868 goto out;
869 }
870
871 /* are we locked? (ioctl lock) */
872 if (s->lock && s->lock != file) {
873 DPRINTK("device locked\n");
874 ret = -EACCES;
875 goto out;
876 }
877
878 ret = comedi_check_chanlist(s, 1, &insn->chanspec);
879 if (ret < 0) {
880 ret = -EINVAL;
881 DPRINTK("bad chanspec\n");
882 goto out;
883 }
884
885 if (s->busy) {
886 ret = -EBUSY;
887 goto out;
888 }
889 /* This looks arbitrary. It is. */
890 s->busy = &parse_insn;
891 switch (insn->insn) {
892 case INSN_READ:
893 ret = s->insn_read(dev, s, insn, data);
894 break;
895 case INSN_WRITE:
896 maxdata = s->maxdata_list
897 ? s->maxdata_list[CR_CHAN(insn->chanspec)]
898 : s->maxdata;
899 for (i = 0; i < insn->n; ++i) {
900 if (data[i] > maxdata) {
901 ret = -EINVAL;
902 DPRINTK("bad data value(s)\n");
903 break;
904 }
905 }
906 if (ret == 0)
907 ret = s->insn_write(dev, s, insn, data);
908 break;
909 case INSN_BITS:
910 if (insn->n != 2) {
911 ret = -EINVAL;
912 break;
913 }
914 ret = s->insn_bits(dev, s, insn, data);
915 break;
916 case INSN_CONFIG:
917 ret = check_insn_config_length(insn, data);
918 if (ret)
919 break;
920 ret = s->insn_config(dev, s, insn, data);
921 break;
922 default:
923 ret = -EINVAL;
924 break;
925 }
926
927 s->busy = NULL;
928 }
929
930 out:
931 return ret;
932 }
933
934 /*
935 * COMEDI_INSN
936 * synchronous instructions
937 *
938 * arg:
939 * pointer to insn
940 *
941 * reads:
942 * struct comedi_insn struct at arg
943 * data (for writes)
944 *
945 * writes:
946 * data (for reads)
947 */
948 static int do_insn_ioctl(struct comedi_device *dev,
949 struct comedi_insn __user *arg, void *file)
950 {
951 struct comedi_insn insn;
952 unsigned int *data = NULL;
953 int ret = 0;
954
955 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
956 if (!data) {
957 ret = -ENOMEM;
958 goto error;
959 }
960
961 if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) {
962 ret = -EFAULT;
963 goto error;
964 }
965
966 /* This is where the behavior of insn and insnlist deviate. */
967 if (insn.n > MAX_SAMPLES)
968 insn.n = MAX_SAMPLES;
969 if (insn.insn & INSN_MASK_WRITE) {
970 if (copy_from_user(data,
971 insn.data,
972 insn.n * sizeof(unsigned int))) {
973 ret = -EFAULT;
974 goto error;
975 }
976 }
977 ret = parse_insn(dev, &insn, data, file);
978 if (ret < 0)
979 goto error;
980 if (insn.insn & INSN_MASK_READ) {
981 if (copy_to_user(insn.data,
982 data,
983 insn.n * sizeof(unsigned int))) {
984 ret = -EFAULT;
985 goto error;
986 }
987 }
988 ret = insn.n;
989
990 error:
991 kfree(data);
992
993 return ret;
994 }
995
996 static void comedi_set_subdevice_runflags(struct comedi_subdevice *s,
997 unsigned mask, unsigned bits)
998 {
999 unsigned long flags;
1000
1001 spin_lock_irqsave(&s->spin_lock, flags);
1002 s->runflags &= ~mask;
1003 s->runflags |= (bits & mask);
1004 spin_unlock_irqrestore(&s->spin_lock, flags);
1005 }
1006
1007 static int do_cmd_ioctl(struct comedi_device *dev,
1008 struct comedi_cmd __user *cmd, void *file)
1009 {
1010 struct comedi_cmd user_cmd;
1011 struct comedi_subdevice *s;
1012 struct comedi_async *async;
1013 int ret = 0;
1014 unsigned int __user *chanlist_saver = NULL;
1015
1016 if (copy_from_user(&user_cmd, cmd, sizeof(struct comedi_cmd))) {
1017 DPRINTK("bad cmd address\n");
1018 return -EFAULT;
1019 }
1020 /* save user's chanlist pointer so it can be restored later */
1021 chanlist_saver = user_cmd.chanlist;
1022
1023 if (user_cmd.subdev >= dev->n_subdevices) {
1024 DPRINTK("%d no such subdevice\n", user_cmd.subdev);
1025 return -ENODEV;
1026 }
1027
1028 s = dev->subdevices + user_cmd.subdev;
1029 async = s->async;
1030
1031 if (s->type == COMEDI_SUBD_UNUSED) {
1032 DPRINTK("%d not valid subdevice\n", user_cmd.subdev);
1033 return -EIO;
1034 }
1035
1036 if (!s->do_cmd || !s->do_cmdtest || !s->async) {
1037 DPRINTK("subdevice %i does not support commands\n",
1038 user_cmd.subdev);
1039 return -EIO;
1040 }
1041
1042 /* are we locked? (ioctl lock) */
1043 if (s->lock && s->lock != file) {
1044 DPRINTK("subdevice locked\n");
1045 return -EACCES;
1046 }
1047
1048 /* are we busy? */
1049 if (s->busy) {
1050 DPRINTK("subdevice busy\n");
1051 return -EBUSY;
1052 }
1053 s->busy = file;
1054
1055 /* make sure channel/gain list isn't too long */
1056 if (user_cmd.chanlist_len > s->len_chanlist) {
1057 DPRINTK("channel/gain list too long %u > %d\n",
1058 user_cmd.chanlist_len, s->len_chanlist);
1059 ret = -EINVAL;
1060 goto cleanup;
1061 }
1062
1063 /* make sure channel/gain list isn't too short */
1064 if (user_cmd.chanlist_len < 1) {
1065 DPRINTK("channel/gain list too short %u < 1\n",
1066 user_cmd.chanlist_len);
1067 ret = -EINVAL;
1068 goto cleanup;
1069 }
1070
1071 kfree(async->cmd.chanlist);
1072 async->cmd = user_cmd;
1073 async->cmd.data = NULL;
1074 /* load channel/gain list */
1075 async->cmd.chanlist =
1076 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1077 if (!async->cmd.chanlist) {
1078 DPRINTK("allocation failed\n");
1079 ret = -ENOMEM;
1080 goto cleanup;
1081 }
1082
1083 if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist,
1084 async->cmd.chanlist_len * sizeof(int))) {
1085 DPRINTK("fault reading chanlist\n");
1086 ret = -EFAULT;
1087 goto cleanup;
1088 }
1089
1090 /* make sure each element in channel/gain list is valid */
1091 ret = comedi_check_chanlist(s,
1092 async->cmd.chanlist_len,
1093 async->cmd.chanlist);
1094 if (ret < 0) {
1095 DPRINTK("bad chanlist\n");
1096 goto cleanup;
1097 }
1098
1099 ret = s->do_cmdtest(dev, s, &async->cmd);
1100
1101 if (async->cmd.flags & TRIG_BOGUS || ret) {
1102 DPRINTK("test returned %d\n", ret);
1103 user_cmd = async->cmd;
1104 /* restore chanlist pointer before copying back */
1105 user_cmd.chanlist = chanlist_saver;
1106 user_cmd.data = NULL;
1107 if (copy_to_user(cmd, &user_cmd, sizeof(struct comedi_cmd))) {
1108 DPRINTK("fault writing cmd\n");
1109 ret = -EFAULT;
1110 goto cleanup;
1111 }
1112 ret = -EAGAIN;
1113 goto cleanup;
1114 }
1115
1116 if (!async->prealloc_bufsz) {
1117 ret = -ENOMEM;
1118 DPRINTK("no buffer (?)\n");
1119 goto cleanup;
1120 }
1121
1122 comedi_reset_async_buf(async);
1123
1124 async->cb_mask =
1125 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
1126 COMEDI_CB_OVERFLOW;
1127 if (async->cmd.flags & TRIG_WAKE_EOS)
1128 async->cb_mask |= COMEDI_CB_EOS;
1129
1130 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
1131
1132 ret = s->do_cmd(dev, s);
1133 if (ret == 0)
1134 return 0;
1135
1136 cleanup:
1137 do_become_nonbusy(dev, s);
1138
1139 return ret;
1140 }
1141
1142 /*
1143 COMEDI_CMDTEST
1144 command testing ioctl
1145
1146 arg:
1147 pointer to cmd structure
1148
1149 reads:
1150 cmd structure at arg
1151 channel/range list
1152
1153 writes:
1154 modified cmd structure at arg
1155
1156 */
1157 static int do_cmdtest_ioctl(struct comedi_device *dev,
1158 struct comedi_cmd __user *arg, void *file)
1159 {
1160 struct comedi_cmd user_cmd;
1161 struct comedi_subdevice *s;
1162 int ret = 0;
1163 unsigned int *chanlist = NULL;
1164 unsigned int __user *chanlist_saver = NULL;
1165
1166 if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) {
1167 DPRINTK("bad cmd address\n");
1168 return -EFAULT;
1169 }
1170 /* save user's chanlist pointer so it can be restored later */
1171 chanlist_saver = user_cmd.chanlist;
1172
1173 if (user_cmd.subdev >= dev->n_subdevices) {
1174 DPRINTK("%d no such subdevice\n", user_cmd.subdev);
1175 return -ENODEV;
1176 }
1177
1178 s = dev->subdevices + user_cmd.subdev;
1179 if (s->type == COMEDI_SUBD_UNUSED) {
1180 DPRINTK("%d not valid subdevice\n", user_cmd.subdev);
1181 return -EIO;
1182 }
1183
1184 if (!s->do_cmd || !s->do_cmdtest) {
1185 DPRINTK("subdevice %i does not support commands\n",
1186 user_cmd.subdev);
1187 return -EIO;
1188 }
1189
1190 /* make sure channel/gain list isn't too long */
1191 if (user_cmd.chanlist_len > s->len_chanlist) {
1192 DPRINTK("channel/gain list too long %d > %d\n",
1193 user_cmd.chanlist_len, s->len_chanlist);
1194 ret = -EINVAL;
1195 goto cleanup;
1196 }
1197
1198 /* load channel/gain list */
1199 if (user_cmd.chanlist) {
1200 chanlist =
1201 kmalloc(user_cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1202 if (!chanlist) {
1203 DPRINTK("allocation failed\n");
1204 ret = -ENOMEM;
1205 goto cleanup;
1206 }
1207
1208 if (copy_from_user(chanlist, user_cmd.chanlist,
1209 user_cmd.chanlist_len * sizeof(int))) {
1210 DPRINTK("fault reading chanlist\n");
1211 ret = -EFAULT;
1212 goto cleanup;
1213 }
1214
1215 /* make sure each element in channel/gain list is valid */
1216 ret = comedi_check_chanlist(s, user_cmd.chanlist_len, chanlist);
1217 if (ret < 0) {
1218 DPRINTK("bad chanlist\n");
1219 goto cleanup;
1220 }
1221
1222 user_cmd.chanlist = chanlist;
1223 }
1224
1225 ret = s->do_cmdtest(dev, s, &user_cmd);
1226
1227 /* restore chanlist pointer before copying back */
1228 user_cmd.chanlist = chanlist_saver;
1229
1230 if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) {
1231 DPRINTK("bad cmd address\n");
1232 ret = -EFAULT;
1233 goto cleanup;
1234 }
1235 cleanup:
1236 kfree(chanlist);
1237
1238 return ret;
1239 }
1240
1241 /*
1242 COMEDI_LOCK
1243 lock subdevice
1244
1245 arg:
1246 subdevice number
1247
1248 reads:
1249 none
1250
1251 writes:
1252 none
1253
1254 */
1255
1256 static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
1257 void *file)
1258 {
1259 int ret = 0;
1260 unsigned long flags;
1261 struct comedi_subdevice *s;
1262
1263 if (arg >= dev->n_subdevices)
1264 return -EINVAL;
1265 s = dev->subdevices + arg;
1266
1267 spin_lock_irqsave(&s->spin_lock, flags);
1268 if (s->busy || s->lock)
1269 ret = -EBUSY;
1270 else
1271 s->lock = file;
1272 spin_unlock_irqrestore(&s->spin_lock, flags);
1273
1274 if (ret < 0)
1275 return ret;
1276
1277 #if 0
1278 if (s->lock_f)
1279 ret = s->lock_f(dev, s);
1280 #endif
1281
1282 return ret;
1283 }
1284
1285 /*
1286 COMEDI_UNLOCK
1287 unlock subdevice
1288
1289 arg:
1290 subdevice number
1291
1292 reads:
1293 none
1294
1295 writes:
1296 none
1297
1298 This function isn't protected by the semaphore, since
1299 we already own the lock.
1300 */
1301 static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
1302 void *file)
1303 {
1304 struct comedi_subdevice *s;
1305
1306 if (arg >= dev->n_subdevices)
1307 return -EINVAL;
1308 s = dev->subdevices + arg;
1309
1310 if (s->busy)
1311 return -EBUSY;
1312
1313 if (s->lock && s->lock != file)
1314 return -EACCES;
1315
1316 if (s->lock == file) {
1317 #if 0
1318 if (s->unlock)
1319 s->unlock(dev, s);
1320 #endif
1321
1322 s->lock = NULL;
1323 }
1324
1325 return 0;
1326 }
1327
1328 /*
1329 COMEDI_CANCEL
1330 cancel acquisition ioctl
1331
1332 arg:
1333 subdevice number
1334
1335 reads:
1336 nothing
1337
1338 writes:
1339 nothing
1340
1341 */
1342 static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
1343 void *file)
1344 {
1345 struct comedi_subdevice *s;
1346
1347 if (arg >= dev->n_subdevices)
1348 return -EINVAL;
1349 s = dev->subdevices + arg;
1350 if (s->async == NULL)
1351 return -EINVAL;
1352
1353 if (s->lock && s->lock != file)
1354 return -EACCES;
1355
1356 if (!s->busy)
1357 return 0;
1358
1359 if (s->busy != file)
1360 return -EBUSY;
1361
1362 return do_cancel(dev, s);
1363 }
1364
1365 /*
1366 COMEDI_POLL ioctl
1367 instructs driver to synchronize buffers
1368
1369 arg:
1370 subdevice number
1371
1372 reads:
1373 nothing
1374
1375 writes:
1376 nothing
1377
1378 */
1379 static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg,
1380 void *file)
1381 {
1382 struct comedi_subdevice *s;
1383
1384 if (arg >= dev->n_subdevices)
1385 return -EINVAL;
1386 s = dev->subdevices + arg;
1387
1388 if (s->lock && s->lock != file)
1389 return -EACCES;
1390
1391 if (!s->busy)
1392 return 0;
1393
1394 if (s->busy != file)
1395 return -EBUSY;
1396
1397 if (s->poll)
1398 return s->poll(dev, s);
1399
1400 return -EINVAL;
1401 }
1402
1403 static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
1404 {
1405 int ret = 0;
1406
1407 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel)
1408 ret = s->cancel(dev, s);
1409
1410 do_become_nonbusy(dev, s);
1411
1412 return ret;
1413 }
1414
1415 static void comedi_unmap(struct vm_area_struct *area)
1416 {
1417 struct comedi_async *async;
1418 struct comedi_device *dev;
1419
1420 async = area->vm_private_data;
1421 dev = async->subdevice->device;
1422
1423 mutex_lock(&dev->mutex);
1424 async->mmap_count--;
1425 mutex_unlock(&dev->mutex);
1426 }
1427
1428 static struct vm_operations_struct comedi_vm_ops = {
1429 .close = comedi_unmap,
1430 };
1431
1432 static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
1433 {
1434 const unsigned minor = iminor(file->f_dentry->d_inode);
1435 struct comedi_device_file_info *dev_file_info =
1436 comedi_get_device_file_info(minor);
1437 struct comedi_device *dev = dev_file_info->device;
1438 struct comedi_async *async = NULL;
1439 unsigned long start = vma->vm_start;
1440 unsigned long size;
1441 int n_pages;
1442 int i;
1443 int retval;
1444 struct comedi_subdevice *s;
1445
1446 mutex_lock(&dev->mutex);
1447 if (!dev->attached) {
1448 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1449 retval = -ENODEV;
1450 goto done;
1451 }
1452 if (vma->vm_flags & VM_WRITE)
1453 s = comedi_get_write_subdevice(dev_file_info);
1454 else
1455 s = comedi_get_read_subdevice(dev_file_info);
1456
1457 if (s == NULL) {
1458 retval = -EINVAL;
1459 goto done;
1460 }
1461 async = s->async;
1462 if (async == NULL) {
1463 retval = -EINVAL;
1464 goto done;
1465 }
1466
1467 if (vma->vm_pgoff != 0) {
1468 DPRINTK("comedi: mmap() offset must be 0.\n");
1469 retval = -EINVAL;
1470 goto done;
1471 }
1472
1473 size = vma->vm_end - vma->vm_start;
1474 if (size > async->prealloc_bufsz) {
1475 retval = -EFAULT;
1476 goto done;
1477 }
1478 if (size & (~PAGE_MASK)) {
1479 retval = -EFAULT;
1480 goto done;
1481 }
1482
1483 n_pages = size >> PAGE_SHIFT;
1484 for (i = 0; i < n_pages; ++i) {
1485 if (remap_pfn_range(vma, start,
1486 page_to_pfn(virt_to_page
1487 (async->buf_page_list
1488 [i].virt_addr)), PAGE_SIZE,
1489 PAGE_SHARED)) {
1490 retval = -EAGAIN;
1491 goto done;
1492 }
1493 start += PAGE_SIZE;
1494 }
1495
1496 vma->vm_ops = &comedi_vm_ops;
1497 vma->vm_private_data = async;
1498
1499 async->mmap_count++;
1500
1501 retval = 0;
1502 done:
1503 mutex_unlock(&dev->mutex);
1504 return retval;
1505 }
1506
1507 static unsigned int comedi_poll(struct file *file, poll_table * wait)
1508 {
1509 unsigned int mask = 0;
1510 const unsigned minor = iminor(file->f_dentry->d_inode);
1511 struct comedi_device_file_info *dev_file_info =
1512 comedi_get_device_file_info(minor);
1513 struct comedi_device *dev = dev_file_info->device;
1514 struct comedi_subdevice *read_subdev;
1515 struct comedi_subdevice *write_subdev;
1516
1517 mutex_lock(&dev->mutex);
1518 if (!dev->attached) {
1519 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1520 mutex_unlock(&dev->mutex);
1521 return 0;
1522 }
1523
1524 mask = 0;
1525 read_subdev = comedi_get_read_subdevice(dev_file_info);
1526 if (read_subdev) {
1527 poll_wait(file, &read_subdev->async->wait_head, wait);
1528 if (!read_subdev->busy
1529 || comedi_buf_read_n_available(read_subdev->async) > 0
1530 || !(comedi_get_subdevice_runflags(read_subdev) &
1531 SRF_RUNNING)) {
1532 mask |= POLLIN | POLLRDNORM;
1533 }
1534 }
1535 write_subdev = comedi_get_write_subdevice(dev_file_info);
1536 if (write_subdev) {
1537 poll_wait(file, &write_subdev->async->wait_head, wait);
1538 comedi_buf_write_alloc(write_subdev->async,
1539 write_subdev->async->prealloc_bufsz);
1540 if (!write_subdev->busy
1541 || !(comedi_get_subdevice_runflags(write_subdev) &
1542 SRF_RUNNING)
1543 || comedi_buf_write_n_allocated(write_subdev->async) >=
1544 bytes_per_sample(write_subdev->async->subdevice)) {
1545 mask |= POLLOUT | POLLWRNORM;
1546 }
1547 }
1548
1549 mutex_unlock(&dev->mutex);
1550 return mask;
1551 }
1552
1553 static ssize_t comedi_write(struct file *file, const char __user *buf,
1554 size_t nbytes, loff_t *offset)
1555 {
1556 struct comedi_subdevice *s;
1557 struct comedi_async *async;
1558 int n, m, count = 0, retval = 0;
1559 DECLARE_WAITQUEUE(wait, current);
1560 const unsigned minor = iminor(file->f_dentry->d_inode);
1561 struct comedi_device_file_info *dev_file_info =
1562 comedi_get_device_file_info(minor);
1563 struct comedi_device *dev = dev_file_info->device;
1564
1565 if (!dev->attached) {
1566 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1567 retval = -ENODEV;
1568 goto done;
1569 }
1570
1571 s = comedi_get_write_subdevice(dev_file_info);
1572 if (s == NULL) {
1573 retval = -EIO;
1574 goto done;
1575 }
1576 async = s->async;
1577
1578 if (!nbytes) {
1579 retval = 0;
1580 goto done;
1581 }
1582 if (!s->busy) {
1583 retval = 0;
1584 goto done;
1585 }
1586 if (s->busy != file) {
1587 retval = -EACCES;
1588 goto done;
1589 }
1590 add_wait_queue(&async->wait_head, &wait);
1591 while (nbytes > 0 && !retval) {
1592 set_current_state(TASK_INTERRUPTIBLE);
1593
1594 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1595 if (count == 0) {
1596 if (comedi_get_subdevice_runflags(s) &
1597 SRF_ERROR) {
1598 retval = -EPIPE;
1599 } else {
1600 retval = 0;
1601 }
1602 do_become_nonbusy(dev, s);
1603 }
1604 break;
1605 }
1606
1607 n = nbytes;
1608
1609 m = n;
1610 if (async->buf_write_ptr + m > async->prealloc_bufsz)
1611 m = async->prealloc_bufsz - async->buf_write_ptr;
1612 comedi_buf_write_alloc(async, async->prealloc_bufsz);
1613 if (m > comedi_buf_write_n_allocated(async))
1614 m = comedi_buf_write_n_allocated(async);
1615 if (m < n)
1616 n = m;
1617
1618 if (n == 0) {
1619 if (file->f_flags & O_NONBLOCK) {
1620 retval = -EAGAIN;
1621 break;
1622 }
1623 if (signal_pending(current)) {
1624 retval = -ERESTARTSYS;
1625 break;
1626 }
1627 schedule();
1628 if (!s->busy)
1629 break;
1630 if (s->busy != file) {
1631 retval = -EACCES;
1632 break;
1633 }
1634 continue;
1635 }
1636
1637 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr,
1638 buf, n);
1639 if (m) {
1640 n -= m;
1641 retval = -EFAULT;
1642 }
1643 comedi_buf_write_free(async, n);
1644
1645 count += n;
1646 nbytes -= n;
1647
1648 buf += n;
1649 break; /* makes device work like a pipe */
1650 }
1651 set_current_state(TASK_RUNNING);
1652 remove_wait_queue(&async->wait_head, &wait);
1653
1654 done:
1655 return count ? count : retval;
1656 }
1657
1658 static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
1659 loff_t *offset)
1660 {
1661 struct comedi_subdevice *s;
1662 struct comedi_async *async;
1663 int n, m, count = 0, retval = 0;
1664 DECLARE_WAITQUEUE(wait, current);
1665 const unsigned minor = iminor(file->f_dentry->d_inode);
1666 struct comedi_device_file_info *dev_file_info =
1667 comedi_get_device_file_info(minor);
1668 struct comedi_device *dev = dev_file_info->device;
1669
1670 if (!dev->attached) {
1671 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1672 retval = -ENODEV;
1673 goto done;
1674 }
1675
1676 s = comedi_get_read_subdevice(dev_file_info);
1677 if (s == NULL) {
1678 retval = -EIO;
1679 goto done;
1680 }
1681 async = s->async;
1682 if (!nbytes) {
1683 retval = 0;
1684 goto done;
1685 }
1686 if (!s->busy) {
1687 retval = 0;
1688 goto done;
1689 }
1690 if (s->busy != file) {
1691 retval = -EACCES;
1692 goto done;
1693 }
1694
1695 add_wait_queue(&async->wait_head, &wait);
1696 while (nbytes > 0 && !retval) {
1697 set_current_state(TASK_INTERRUPTIBLE);
1698
1699 n = nbytes;
1700
1701 m = comedi_buf_read_n_available(async);
1702 /* printk("%d available\n",m); */
1703 if (async->buf_read_ptr + m > async->prealloc_bufsz)
1704 m = async->prealloc_bufsz - async->buf_read_ptr;
1705 /* printk("%d contiguous\n",m); */
1706 if (m < n)
1707 n = m;
1708
1709 if (n == 0) {
1710 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1711 do_become_nonbusy(dev, s);
1712 if (comedi_get_subdevice_runflags(s) &
1713 SRF_ERROR) {
1714 retval = -EPIPE;
1715 } else {
1716 retval = 0;
1717 }
1718 break;
1719 }
1720 if (file->f_flags & O_NONBLOCK) {
1721 retval = -EAGAIN;
1722 break;
1723 }
1724 if (signal_pending(current)) {
1725 retval = -ERESTARTSYS;
1726 break;
1727 }
1728 schedule();
1729 if (!s->busy) {
1730 retval = 0;
1731 break;
1732 }
1733 if (s->busy != file) {
1734 retval = -EACCES;
1735 break;
1736 }
1737 continue;
1738 }
1739 m = copy_to_user(buf, async->prealloc_buf +
1740 async->buf_read_ptr, n);
1741 if (m) {
1742 n -= m;
1743 retval = -EFAULT;
1744 }
1745
1746 comedi_buf_read_alloc(async, n);
1747 comedi_buf_read_free(async, n);
1748
1749 count += n;
1750 nbytes -= n;
1751
1752 buf += n;
1753 break; /* makes device work like a pipe */
1754 }
1755 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) &&
1756 async->buf_read_count - async->buf_write_count == 0) {
1757 do_become_nonbusy(dev, s);
1758 }
1759 set_current_state(TASK_RUNNING);
1760 remove_wait_queue(&async->wait_head, &wait);
1761
1762 done:
1763 return count ? count : retval;
1764 }
1765
1766 /*
1767 This function restores a subdevice to an idle state.
1768 */
1769 void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s)
1770 {
1771 struct comedi_async *async = s->async;
1772
1773 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
1774 if (async) {
1775 comedi_reset_async_buf(async);
1776 async->inttrig = NULL;
1777 } else {
1778 printk(KERN_ERR
1779 "BUG: (?) do_become_nonbusy called with async=0\n");
1780 }
1781
1782 s->busy = NULL;
1783 }
1784
1785 static int comedi_open(struct inode *inode, struct file *file)
1786 {
1787 const unsigned minor = iminor(inode);
1788 struct comedi_device_file_info *dev_file_info =
1789 comedi_get_device_file_info(minor);
1790 struct comedi_device *dev =
1791 dev_file_info ? dev_file_info->device : NULL;
1792
1793 if (dev == NULL) {
1794 DPRINTK("invalid minor number\n");
1795 return -ENODEV;
1796 }
1797
1798 /* This is slightly hacky, but we want module autoloading
1799 * to work for root.
1800 * case: user opens device, attached -> ok
1801 * case: user opens device, unattached, in_request_module=0 -> autoload
1802 * case: user opens device, unattached, in_request_module=1 -> fail
1803 * case: root opens device, attached -> ok
1804 * case: root opens device, unattached, in_request_module=1 -> ok
1805 * (typically called from modprobe)
1806 * case: root opens device, unattached, in_request_module=0 -> autoload
1807 *
1808 * The last could be changed to "-> ok", which would deny root
1809 * autoloading.
1810 */
1811 mutex_lock(&dev->mutex);
1812 if (dev->attached)
1813 goto ok;
1814 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) {
1815 DPRINTK("in request module\n");
1816 mutex_unlock(&dev->mutex);
1817 return -ENODEV;
1818 }
1819 if (capable(CAP_NET_ADMIN) && dev->in_request_module)
1820 goto ok;
1821
1822 dev->in_request_module = 1;
1823
1824 #ifdef CONFIG_KMOD
1825 mutex_unlock(&dev->mutex);
1826 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor);
1827 mutex_lock(&dev->mutex);
1828 #endif
1829
1830 dev->in_request_module = 0;
1831
1832 if (!dev->attached && !capable(CAP_NET_ADMIN)) {
1833 DPRINTK("not attached and not CAP_NET_ADMIN\n");
1834 mutex_unlock(&dev->mutex);
1835 return -ENODEV;
1836 }
1837 ok:
1838 __module_get(THIS_MODULE);
1839
1840 if (dev->attached) {
1841 if (!try_module_get(dev->driver->module)) {
1842 module_put(THIS_MODULE);
1843 mutex_unlock(&dev->mutex);
1844 return -ENOSYS;
1845 }
1846 }
1847
1848 if (dev->attached && dev->use_count == 0 && dev->open) {
1849 int rc = dev->open(dev);
1850 if (rc < 0) {
1851 module_put(dev->driver->module);
1852 module_put(THIS_MODULE);
1853 mutex_unlock(&dev->mutex);
1854 return rc;
1855 }
1856 }
1857
1858 dev->use_count++;
1859
1860 mutex_unlock(&dev->mutex);
1861
1862 return 0;
1863 }
1864
1865 static int comedi_close(struct inode *inode, struct file *file)
1866 {
1867 const unsigned minor = iminor(inode);
1868 struct comedi_device_file_info *dev_file_info =
1869 comedi_get_device_file_info(minor);
1870 struct comedi_device *dev = dev_file_info->device;
1871 struct comedi_subdevice *s = NULL;
1872 int i;
1873
1874 mutex_lock(&dev->mutex);
1875
1876 if (dev->subdevices) {
1877 for (i = 0; i < dev->n_subdevices; i++) {
1878 s = dev->subdevices + i;
1879
1880 if (s->busy == file)
1881 do_cancel(dev, s);
1882 if (s->lock == file)
1883 s->lock = NULL;
1884 }
1885 }
1886 if (dev->attached && dev->use_count == 1 && dev->close)
1887 dev->close(dev);
1888
1889 module_put(THIS_MODULE);
1890 if (dev->attached)
1891 module_put(dev->driver->module);
1892
1893 dev->use_count--;
1894
1895 mutex_unlock(&dev->mutex);
1896
1897 if (file->f_flags & FASYNC)
1898 comedi_fasync(-1, file, 0);
1899
1900 return 0;
1901 }
1902
1903 static int comedi_fasync(int fd, struct file *file, int on)
1904 {
1905 const unsigned minor = iminor(file->f_dentry->d_inode);
1906 struct comedi_device_file_info *dev_file_info =
1907 comedi_get_device_file_info(minor);
1908
1909 struct comedi_device *dev = dev_file_info->device;
1910
1911 return fasync_helper(fd, file, on, &dev->async_queue);
1912 }
1913
1914 const struct file_operations comedi_fops = {
1915 .owner = THIS_MODULE,
1916 .unlocked_ioctl = comedi_unlocked_ioctl,
1917 .compat_ioctl = comedi_compat_ioctl,
1918 .open = comedi_open,
1919 .release = comedi_close,
1920 .read = comedi_read,
1921 .write = comedi_write,
1922 .mmap = comedi_mmap,
1923 .poll = comedi_poll,
1924 .fasync = comedi_fasync,
1925 .llseek = noop_llseek,
1926 };
1927
1928 struct class *comedi_class;
1929 static struct cdev comedi_cdev;
1930
1931 static void comedi_cleanup_legacy_minors(void)
1932 {
1933 unsigned i;
1934
1935 for (i = 0; i < comedi_num_legacy_minors; i++)
1936 comedi_free_board_minor(i);
1937 }
1938
1939 static int __init comedi_init(void)
1940 {
1941 int i;
1942 int retval;
1943
1944 printk(KERN_INFO "comedi: version " COMEDI_RELEASE
1945 " - http://www.comedi.org\n");
1946
1947 if (comedi_num_legacy_minors < 0 ||
1948 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
1949 printk(KERN_ERR "comedi: error: invalid value for module "
1950 "parameter \"comedi_num_legacy_minors\". Valid values "
1951 "are 0 through %i.\n", COMEDI_NUM_BOARD_MINORS);
1952 return -EINVAL;
1953 }
1954
1955 /*
1956 * comedi is unusable if both comedi_autoconfig and
1957 * comedi_num_legacy_minors are zero, so we might as well adjust the
1958 * defaults in that case
1959 */
1960 if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0)
1961 comedi_num_legacy_minors = 16;
1962
1963 memset(comedi_file_info_table, 0,
1964 sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS);
1965
1966 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
1967 COMEDI_NUM_MINORS, "comedi");
1968 if (retval)
1969 return -EIO;
1970 cdev_init(&comedi_cdev, &comedi_fops);
1971 comedi_cdev.owner = THIS_MODULE;
1972 kobject_set_name(&comedi_cdev.kobj, "comedi");
1973 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
1974 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
1975 COMEDI_NUM_MINORS);
1976 return -EIO;
1977 }
1978 comedi_class = class_create(THIS_MODULE, "comedi");
1979 if (IS_ERR(comedi_class)) {
1980 printk(KERN_ERR "comedi: failed to create class");
1981 cdev_del(&comedi_cdev);
1982 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
1983 COMEDI_NUM_MINORS);
1984 return PTR_ERR(comedi_class);
1985 }
1986
1987 /* XXX requires /proc interface */
1988 comedi_proc_init();
1989
1990 /* create devices files for legacy/manual use */
1991 for (i = 0; i < comedi_num_legacy_minors; i++) {
1992 int minor;
1993 minor = comedi_alloc_board_minor(NULL);
1994 if (minor < 0) {
1995 comedi_cleanup_legacy_minors();
1996 cdev_del(&comedi_cdev);
1997 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
1998 COMEDI_NUM_MINORS);
1999 return minor;
2000 }
2001 }
2002
2003 return 0;
2004 }
2005
2006 static void __exit comedi_cleanup(void)
2007 {
2008 int i;
2009
2010 comedi_cleanup_legacy_minors();
2011 for (i = 0; i < COMEDI_NUM_MINORS; ++i)
2012 BUG_ON(comedi_file_info_table[i]);
2013
2014 class_destroy(comedi_class);
2015 cdev_del(&comedi_cdev);
2016 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
2017
2018 comedi_proc_cleanup();
2019 }
2020
2021 module_init(comedi_init);
2022 module_exit(comedi_cleanup);
2023
2024 void comedi_error(const struct comedi_device *dev, const char *s)
2025 {
2026 printk(KERN_ERR "comedi%d: %s: %s\n", dev->minor,
2027 dev->driver->driver_name, s);
2028 }
2029 EXPORT_SYMBOL(comedi_error);
2030
2031 void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
2032 {
2033 struct comedi_async *async = s->async;
2034 unsigned runflags = 0;
2035 unsigned runflags_mask = 0;
2036
2037 /* DPRINTK("comedi_event 0x%x\n",mask); */
2038
2039 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0)
2040 return;
2041
2042 if (s->
2043 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR |
2044 COMEDI_CB_OVERFLOW)) {
2045 runflags_mask |= SRF_RUNNING;
2046 }
2047 /* remember if an error event has occured, so an error
2048 * can be returned the next time the user does a read() */
2049 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
2050 runflags_mask |= SRF_ERROR;
2051 runflags |= SRF_ERROR;
2052 }
2053 if (runflags_mask) {
2054 /*sets SRF_ERROR and SRF_RUNNING together atomically */
2055 comedi_set_subdevice_runflags(s, runflags_mask, runflags);
2056 }
2057
2058 if (async->cb_mask & s->async->events) {
2059 if (comedi_get_subdevice_runflags(s) & SRF_USER) {
2060 wake_up_interruptible(&async->wait_head);
2061 if (s->subdev_flags & SDF_CMD_READ)
2062 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
2063 if (s->subdev_flags & SDF_CMD_WRITE)
2064 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT);
2065 } else {
2066 if (async->cb_func)
2067 async->cb_func(s->async->events, async->cb_arg);
2068 }
2069 }
2070 s->async->events = 0;
2071 }
2072 EXPORT_SYMBOL(comedi_event);
2073
2074 unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s)
2075 {
2076 unsigned long flags;
2077 unsigned runflags;
2078
2079 spin_lock_irqsave(&s->spin_lock, flags);
2080 runflags = s->runflags;
2081 spin_unlock_irqrestore(&s->spin_lock, flags);
2082 return runflags;
2083 }
2084 EXPORT_SYMBOL(comedi_get_subdevice_runflags);
2085
2086 static int is_device_busy(struct comedi_device *dev)
2087 {
2088 struct comedi_subdevice *s;
2089 int i;
2090
2091 if (!dev->attached)
2092 return 0;
2093
2094 for (i = 0; i < dev->n_subdevices; i++) {
2095 s = dev->subdevices + i;
2096 if (s->busy)
2097 return 1;
2098 if (s->async && s->async->mmap_count)
2099 return 1;
2100 }
2101
2102 return 0;
2103 }
2104
2105 static void comedi_device_init(struct comedi_device *dev)
2106 {
2107 memset(dev, 0, sizeof(struct comedi_device));
2108 spin_lock_init(&dev->spinlock);
2109 mutex_init(&dev->mutex);
2110 dev->minor = -1;
2111 }
2112
2113 static void comedi_device_cleanup(struct comedi_device *dev)
2114 {
2115 if (dev == NULL)
2116 return;
2117 mutex_lock(&dev->mutex);
2118 comedi_device_detach(dev);
2119 mutex_unlock(&dev->mutex);
2120 mutex_destroy(&dev->mutex);
2121 }
2122
2123 int comedi_alloc_board_minor(struct device *hardware_device)
2124 {
2125 unsigned long flags;
2126 struct comedi_device_file_info *info;
2127 struct device *csdev;
2128 unsigned i;
2129 int retval;
2130
2131 info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
2132 if (info == NULL)
2133 return -ENOMEM;
2134 info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL);
2135 if (info->device == NULL) {
2136 kfree(info);
2137 return -ENOMEM;
2138 }
2139 comedi_device_init(info->device);
2140 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2141 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) {
2142 if (comedi_file_info_table[i] == NULL) {
2143 comedi_file_info_table[i] = info;
2144 break;
2145 }
2146 }
2147 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2148 if (i == COMEDI_NUM_BOARD_MINORS) {
2149 comedi_device_cleanup(info->device);
2150 kfree(info->device);
2151 kfree(info);
2152 printk(KERN_ERR
2153 "comedi: error: "
2154 "ran out of minor numbers for board device files.\n");
2155 return -EBUSY;
2156 }
2157 info->device->minor = i;
2158 csdev = COMEDI_DEVICE_CREATE(comedi_class, NULL,
2159 MKDEV(COMEDI_MAJOR, i), NULL,
2160 hardware_device, "comedi%i", i);
2161 if (!IS_ERR(csdev))
2162 info->device->class_dev = csdev;
2163 dev_set_drvdata(csdev, info);
2164 retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb);
2165 if (retval) {
2166 printk(KERN_ERR
2167 "comedi: "
2168 "failed to create sysfs attribute file \"%s\".\n",
2169 dev_attr_max_read_buffer_kb.attr.name);
2170 comedi_free_board_minor(i);
2171 return retval;
2172 }
2173 retval = device_create_file(csdev, &dev_attr_read_buffer_kb);
2174 if (retval) {
2175 printk(KERN_ERR
2176 "comedi: "
2177 "failed to create sysfs attribute file \"%s\".\n",
2178 dev_attr_read_buffer_kb.attr.name);
2179 comedi_free_board_minor(i);
2180 return retval;
2181 }
2182 retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb);
2183 if (retval) {
2184 printk(KERN_ERR
2185 "comedi: "
2186 "failed to create sysfs attribute file \"%s\".\n",
2187 dev_attr_max_write_buffer_kb.attr.name);
2188 comedi_free_board_minor(i);
2189 return retval;
2190 }
2191 retval = device_create_file(csdev, &dev_attr_write_buffer_kb);
2192 if (retval) {
2193 printk(KERN_ERR
2194 "comedi: "
2195 "failed to create sysfs attribute file \"%s\".\n",
2196 dev_attr_write_buffer_kb.attr.name);
2197 comedi_free_board_minor(i);
2198 return retval;
2199 }
2200 return i;
2201 }
2202
2203 void comedi_free_board_minor(unsigned minor)
2204 {
2205 unsigned long flags;
2206 struct comedi_device_file_info *info;
2207
2208 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
2209 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2210 info = comedi_file_info_table[minor];
2211 comedi_file_info_table[minor] = NULL;
2212 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2213
2214 if (info) {
2215 struct comedi_device *dev = info->device;
2216 if (dev) {
2217 if (dev->class_dev) {
2218 device_destroy(comedi_class,
2219 MKDEV(COMEDI_MAJOR, dev->minor));
2220 }
2221 comedi_device_cleanup(dev);
2222 kfree(dev);
2223 }
2224 kfree(info);
2225 }
2226 }
2227
2228 int comedi_alloc_subdevice_minor(struct comedi_device *dev,
2229 struct comedi_subdevice *s)
2230 {
2231 unsigned long flags;
2232 struct comedi_device_file_info *info;
2233 struct device *csdev;
2234 unsigned i;
2235 int retval;
2236
2237 info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
2238 if (info == NULL)
2239 return -ENOMEM;
2240 info->device = dev;
2241 info->read_subdevice = s;
2242 info->write_subdevice = s;
2243 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2244 for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) {
2245 if (comedi_file_info_table[i] == NULL) {
2246 comedi_file_info_table[i] = info;
2247 break;
2248 }
2249 }
2250 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2251 if (i == COMEDI_NUM_MINORS) {
2252 kfree(info);
2253 printk(KERN_ERR
2254 "comedi: error: "
2255 "ran out of minor numbers for board device files.\n");
2256 return -EBUSY;
2257 }
2258 s->minor = i;
2259 csdev = COMEDI_DEVICE_CREATE(comedi_class, dev->class_dev,
2260 MKDEV(COMEDI_MAJOR, i), NULL, NULL,
2261 "comedi%i_subd%i", dev->minor,
2262 (int)(s - dev->subdevices));
2263 if (!IS_ERR(csdev))
2264 s->class_dev = csdev;
2265 dev_set_drvdata(csdev, info);
2266 retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb);
2267 if (retval) {
2268 printk(KERN_ERR
2269 "comedi: "
2270 "failed to create sysfs attribute file \"%s\".\n",
2271 dev_attr_max_read_buffer_kb.attr.name);
2272 comedi_free_subdevice_minor(s);
2273 return retval;
2274 }
2275 retval = device_create_file(csdev, &dev_attr_read_buffer_kb);
2276 if (retval) {
2277 printk(KERN_ERR
2278 "comedi: "
2279 "failed to create sysfs attribute file \"%s\".\n",
2280 dev_attr_read_buffer_kb.attr.name);
2281 comedi_free_subdevice_minor(s);
2282 return retval;
2283 }
2284 retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb);
2285 if (retval) {
2286 printk(KERN_ERR
2287 "comedi: "
2288 "failed to create sysfs attribute file \"%s\".\n",
2289 dev_attr_max_write_buffer_kb.attr.name);
2290 comedi_free_subdevice_minor(s);
2291 return retval;
2292 }
2293 retval = device_create_file(csdev, &dev_attr_write_buffer_kb);
2294 if (retval) {
2295 printk(KERN_ERR
2296 "comedi: "
2297 "failed to create sysfs attribute file \"%s\".\n",
2298 dev_attr_write_buffer_kb.attr.name);
2299 comedi_free_subdevice_minor(s);
2300 return retval;
2301 }
2302 return i;
2303 }
2304
2305 void comedi_free_subdevice_minor(struct comedi_subdevice *s)
2306 {
2307 unsigned long flags;
2308 struct comedi_device_file_info *info;
2309
2310 if (s == NULL)
2311 return;
2312 if (s->minor < 0)
2313 return;
2314
2315 BUG_ON(s->minor >= COMEDI_NUM_MINORS);
2316 BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR);
2317
2318 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2319 info = comedi_file_info_table[s->minor];
2320 comedi_file_info_table[s->minor] = NULL;
2321 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2322
2323 if (s->class_dev) {
2324 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
2325 s->class_dev = NULL;
2326 }
2327 kfree(info);
2328 }
2329
2330 struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor)
2331 {
2332 unsigned long flags;
2333 struct comedi_device_file_info *info;
2334
2335 BUG_ON(minor >= COMEDI_NUM_MINORS);
2336 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2337 info = comedi_file_info_table[minor];
2338 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2339 return info;
2340 }
2341 EXPORT_SYMBOL_GPL(comedi_get_device_file_info);
2342
2343 static int resize_async_buffer(struct comedi_device *dev,
2344 struct comedi_subdevice *s,
2345 struct comedi_async *async, unsigned new_size)
2346 {
2347 int retval;
2348
2349 if (new_size > async->max_bufsize)
2350 return -EPERM;
2351
2352 if (s->busy) {
2353 DPRINTK("subdevice is busy, cannot resize buffer\n");
2354 return -EBUSY;
2355 }
2356 if (async->mmap_count) {
2357 DPRINTK("subdevice is mmapped, cannot resize buffer\n");
2358 return -EBUSY;
2359 }
2360
2361 if (!async->prealloc_buf)
2362 return -EINVAL;
2363
2364 /* make sure buffer is an integral number of pages
2365 * (we round up) */
2366 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
2367
2368 retval = comedi_buf_alloc(dev, s, new_size);
2369 if (retval < 0)
2370 return retval;
2371
2372 if (s->buf_change) {
2373 retval = s->buf_change(dev, s, new_size);
2374 if (retval < 0)
2375 return retval;
2376 }
2377
2378 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
2379 dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz);
2380 return 0;
2381 }
2382
2383 /* sysfs attribute files */
2384
2385 static const unsigned bytes_per_kibi = 1024;
2386
2387 static ssize_t show_max_read_buffer_kb(struct device *dev,
2388 struct device_attribute *attr, char *buf)
2389 {
2390 ssize_t retval;
2391 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2392 unsigned max_buffer_size_kb = 0;
2393 struct comedi_subdevice *const read_subdevice =
2394 comedi_get_read_subdevice(info);
2395
2396 mutex_lock(&info->device->mutex);
2397 if (read_subdevice &&
2398 (read_subdevice->subdev_flags & SDF_CMD_READ) &&
2399 read_subdevice->async) {
2400 max_buffer_size_kb = read_subdevice->async->max_bufsize /
2401 bytes_per_kibi;
2402 }
2403 retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb);
2404 mutex_unlock(&info->device->mutex);
2405
2406 return retval;
2407 }
2408
2409 static ssize_t store_max_read_buffer_kb(struct device *dev,
2410 struct device_attribute *attr,
2411 const char *buf, size_t count)
2412 {
2413 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2414 unsigned long new_max_size_kb;
2415 uint64_t new_max_size;
2416 struct comedi_subdevice *const read_subdevice =
2417 comedi_get_read_subdevice(info);
2418
2419 if (strict_strtoul(buf, 10, &new_max_size_kb))
2420 return -EINVAL;
2421 if (new_max_size_kb != (uint32_t) new_max_size_kb)
2422 return -EINVAL;
2423 new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi;
2424 if (new_max_size != (uint32_t) new_max_size)
2425 return -EINVAL;
2426
2427 mutex_lock(&info->device->mutex);
2428 if (read_subdevice == NULL ||
2429 (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 ||
2430 read_subdevice->async == NULL) {
2431 mutex_unlock(&info->device->mutex);
2432 return -EINVAL;
2433 }
2434 read_subdevice->async->max_bufsize = new_max_size;
2435 mutex_unlock(&info->device->mutex);
2436
2437 return count;
2438 }
2439
2440 static struct device_attribute dev_attr_max_read_buffer_kb = {
2441 .attr = {
2442 .name = "max_read_buffer_kb",
2443 .mode = S_IRUGO | S_IWUSR},
2444 .show = &show_max_read_buffer_kb,
2445 .store = &store_max_read_buffer_kb
2446 };
2447
2448 static ssize_t show_read_buffer_kb(struct device *dev,
2449 struct device_attribute *attr, char *buf)
2450 {
2451 ssize_t retval;
2452 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2453 unsigned buffer_size_kb = 0;
2454 struct comedi_subdevice *const read_subdevice =
2455 comedi_get_read_subdevice(info);
2456
2457 mutex_lock(&info->device->mutex);
2458 if (read_subdevice &&
2459 (read_subdevice->subdev_flags & SDF_CMD_READ) &&
2460 read_subdevice->async) {
2461 buffer_size_kb = read_subdevice->async->prealloc_bufsz /
2462 bytes_per_kibi;
2463 }
2464 retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb);
2465 mutex_unlock(&info->device->mutex);
2466
2467 return retval;
2468 }
2469
2470 static ssize_t store_read_buffer_kb(struct device *dev,
2471 struct device_attribute *attr,
2472 const char *buf, size_t count)
2473 {
2474 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2475 unsigned long new_size_kb;
2476 uint64_t new_size;
2477 int retval;
2478 struct comedi_subdevice *const read_subdevice =
2479 comedi_get_read_subdevice(info);
2480
2481 if (strict_strtoul(buf, 10, &new_size_kb))
2482 return -EINVAL;
2483 if (new_size_kb != (uint32_t) new_size_kb)
2484 return -EINVAL;
2485 new_size = ((uint64_t) new_size_kb) * bytes_per_kibi;
2486 if (new_size != (uint32_t) new_size)
2487 return -EINVAL;
2488
2489 mutex_lock(&info->device->mutex);
2490 if (read_subdevice == NULL ||
2491 (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 ||
2492 read_subdevice->async == NULL) {
2493 mutex_unlock(&info->device->mutex);
2494 return -EINVAL;
2495 }
2496 retval = resize_async_buffer(info->device, read_subdevice,
2497 read_subdevice->async, new_size);
2498 mutex_unlock(&info->device->mutex);
2499
2500 if (retval < 0)
2501 return retval;
2502 return count;
2503 }
2504
2505 static struct device_attribute dev_attr_read_buffer_kb = {
2506 .attr = {
2507 .name = "read_buffer_kb",
2508 .mode = S_IRUGO | S_IWUSR | S_IWGRP},
2509 .show = &show_read_buffer_kb,
2510 .store = &store_read_buffer_kb
2511 };
2512
2513 static ssize_t show_max_write_buffer_kb(struct device *dev,
2514 struct device_attribute *attr,
2515 char *buf)
2516 {
2517 ssize_t retval;
2518 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2519 unsigned max_buffer_size_kb = 0;
2520 struct comedi_subdevice *const write_subdevice =
2521 comedi_get_write_subdevice(info);
2522
2523 mutex_lock(&info->device->mutex);
2524 if (write_subdevice &&
2525 (write_subdevice->subdev_flags & SDF_CMD_WRITE) &&
2526 write_subdevice->async) {
2527 max_buffer_size_kb = write_subdevice->async->max_bufsize /
2528 bytes_per_kibi;
2529 }
2530 retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb);
2531 mutex_unlock(&info->device->mutex);
2532
2533 return retval;
2534 }
2535
2536 static ssize_t store_max_write_buffer_kb(struct device *dev,
2537 struct device_attribute *attr,
2538 const char *buf, size_t count)
2539 {
2540 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2541 unsigned long new_max_size_kb;
2542 uint64_t new_max_size;
2543 struct comedi_subdevice *const write_subdevice =
2544 comedi_get_write_subdevice(info);
2545
2546 if (strict_strtoul(buf, 10, &new_max_size_kb))
2547 return -EINVAL;
2548 if (new_max_size_kb != (uint32_t) new_max_size_kb)
2549 return -EINVAL;
2550 new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi;
2551 if (new_max_size != (uint32_t) new_max_size)
2552 return -EINVAL;
2553
2554 mutex_lock(&info->device->mutex);
2555 if (write_subdevice == NULL ||
2556 (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 ||
2557 write_subdevice->async == NULL) {
2558 mutex_unlock(&info->device->mutex);
2559 return -EINVAL;
2560 }
2561 write_subdevice->async->max_bufsize = new_max_size;
2562 mutex_unlock(&info->device->mutex);
2563
2564 return count;
2565 }
2566
2567 static struct device_attribute dev_attr_max_write_buffer_kb = {
2568 .attr = {
2569 .name = "max_write_buffer_kb",
2570 .mode = S_IRUGO | S_IWUSR},
2571 .show = &show_max_write_buffer_kb,
2572 .store = &store_max_write_buffer_kb
2573 };
2574
2575 static ssize_t show_write_buffer_kb(struct device *dev,
2576 struct device_attribute *attr, char *buf)
2577 {
2578 ssize_t retval;
2579 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2580 unsigned buffer_size_kb = 0;
2581 struct comedi_subdevice *const write_subdevice =
2582 comedi_get_write_subdevice(info);
2583
2584 mutex_lock(&info->device->mutex);
2585 if (write_subdevice &&
2586 (write_subdevice->subdev_flags & SDF_CMD_WRITE) &&
2587 write_subdevice->async) {
2588 buffer_size_kb = write_subdevice->async->prealloc_bufsz /
2589 bytes_per_kibi;
2590 }
2591 retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb);
2592 mutex_unlock(&info->device->mutex);
2593
2594 return retval;
2595 }
2596
2597 static ssize_t store_write_buffer_kb(struct device *dev,
2598 struct device_attribute *attr,
2599 const char *buf, size_t count)
2600 {
2601 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2602 unsigned long new_size_kb;
2603 uint64_t new_size;
2604 int retval;
2605 struct comedi_subdevice *const write_subdevice =
2606 comedi_get_write_subdevice(info);
2607
2608 if (strict_strtoul(buf, 10, &new_size_kb))
2609 return -EINVAL;
2610 if (new_size_kb != (uint32_t) new_size_kb)
2611 return -EINVAL;
2612 new_size = ((uint64_t) new_size_kb) * bytes_per_kibi;
2613 if (new_size != (uint32_t) new_size)
2614 return -EINVAL;
2615
2616 mutex_lock(&info->device->mutex);
2617 if (write_subdevice == NULL ||
2618 (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 ||
2619 write_subdevice->async == NULL) {
2620 mutex_unlock(&info->device->mutex);
2621 return -EINVAL;
2622 }
2623 retval = resize_async_buffer(info->device, write_subdevice,
2624 write_subdevice->async, new_size);
2625 mutex_unlock(&info->device->mutex);
2626
2627 if (retval < 0)
2628 return retval;
2629 return count;
2630 }
2631
2632 static struct device_attribute dev_attr_write_buffer_kb = {
2633 .attr = {
2634 .name = "write_buffer_kb",
2635 .mode = S_IRUGO | S_IWUSR | S_IWGRP},
2636 .show = &show_write_buffer_kb,
2637 .store = &store_write_buffer_kb
2638 };
Linux kernel - Deliverables
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