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Staging: comedi: don't write to buffer if command finished
[net-next-2.6.git] / drivers / staging / comedi / comedi_fops.c
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CommitLineData
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
54MODULE_AUTHOR("http://www.comedi.org");
55MODULE_DESCRIPTION("Comedi core module");
56MODULE_LICENSE("GPL");
57
58#ifdef CONFIG_COMEDI_DEBUG
59int comedi_debug;
60EXPORT_SYMBOL(comedi_debug);
61module_param(comedi_debug, int, 0644);
62#endif
63
64int comedi_autoconfig = 1;
65module_param(comedi_autoconfig, bool, 0444);
66
67static int comedi_num_legacy_minors;
68module_param(comedi_num_legacy_minors, int, 0444);
69
70static DEFINE_SPINLOCK(comedi_file_info_table_lock);
71static struct comedi_device_file_info
72*comedi_file_info_table[COMEDI_NUM_MINORS];
73
74static int do_devconfig_ioctl(struct comedi_device *dev,
75 struct comedi_devconfig __user *arg);
76static int do_bufconfig_ioctl(struct comedi_device *dev,
77 struct comedi_bufconfig __user *arg);
78static int do_devinfo_ioctl(struct comedi_device *dev,
79 struct comedi_devinfo __user *arg,
80 struct file *file);
81static int do_subdinfo_ioctl(struct comedi_device *dev,
82 struct comedi_subdinfo __user *arg, void *file);
83static int do_chaninfo_ioctl(struct comedi_device *dev,
84 struct comedi_chaninfo __user *arg);
85static int do_bufinfo_ioctl(struct comedi_device *dev,
86 struct comedi_bufinfo __user *arg);
87static int do_cmd_ioctl(struct comedi_device *dev,
88 struct comedi_cmd __user *arg, void *file);
89static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
90 void *file);
91static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
92 void *file);
93static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
94 void *file);
95static int do_cmdtest_ioctl(struct comedi_device *dev,
96 struct comedi_cmd __user *arg, void *file);
97static int do_insnlist_ioctl(struct comedi_device *dev,
98 struct comedi_insnlist __user *arg, void *file);
99static int do_insn_ioctl(struct comedi_device *dev,
100 struct comedi_insn __user *arg, void *file);
101static int do_poll_ioctl(struct comedi_device *dev, unsigned int subd,
102 void *file);
103
104extern void do_become_nonbusy(struct comedi_device *dev,
105 struct comedi_subdevice *s);
106static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
107
108static int comedi_fasync(int fd, struct file *file, int on);
109
110static int is_device_busy(struct comedi_device *dev);
111static 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 */
116static struct device_attribute dev_attr_max_read_buffer_kb;
117static struct device_attribute dev_attr_read_buffer_kb;
118static struct device_attribute dev_attr_max_write_buffer_kb;
119static struct device_attribute dev_attr_write_buffer_kb;
120
121static 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 break;
174 case COMEDI_LOCK:
175 rc = do_lock_ioctl(dev, arg, file);
176 break;
177 case COMEDI_UNLOCK:
178 rc = do_unlock_ioctl(dev, arg, file);
179 break;
180 case COMEDI_CANCEL:
181 rc = do_cancel_ioctl(dev, arg, file);
182 break;
183 case COMEDI_CMD:
184 rc = do_cmd_ioctl(dev, (struct comedi_cmd __user *)arg, file);
185 break;
186 case COMEDI_CMDTEST:
187 rc = do_cmdtest_ioctl(dev, (struct comedi_cmd __user *)arg,
188 file);
189 break;
190 case COMEDI_INSNLIST:
191 rc = do_insnlist_ioctl(dev,
192 (struct comedi_insnlist __user *)arg,
193 file);
194 break;
195 case COMEDI_INSN:
196 rc = do_insn_ioctl(dev, (struct comedi_insn __user *)arg,
197 file);
198 break;
199 case COMEDI_POLL:
200 rc = do_poll_ioctl(dev, arg, file);
201 break;
202 default:
203 rc = -ENOTTY;
204 break;
205 }
206
207done:
208 mutex_unlock(&dev->mutex);
209 return rc;
210}
211
212/*
213 COMEDI_DEVCONFIG
214 device config ioctl
215
216 arg:
217 pointer to devconfig structure
218
219 reads:
220 devconfig structure at arg
221
222 writes:
223 none
224*/
225static int do_devconfig_ioctl(struct comedi_device *dev,
226 struct comedi_devconfig __user *arg)
227{
228 struct comedi_devconfig it;
229 int ret;
230 unsigned char *aux_data = NULL;
231 int aux_len;
232
233 if (!capable(CAP_SYS_ADMIN))
234 return -EPERM;
235
236 if (arg == NULL) {
237 if (is_device_busy(dev))
238 return -EBUSY;
239 if (dev->attached) {
240 struct module *driver_module = dev->driver->module;
241 comedi_device_detach(dev);
242 module_put(driver_module);
243 }
244 return 0;
245 }
246
247 if (copy_from_user(&it, arg, sizeof(struct comedi_devconfig)))
248 return -EFAULT;
249
250 it.board_name[COMEDI_NAMELEN - 1] = 0;
251
252 if (comedi_aux_data(it.options, 0) &&
253 it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH]) {
254 int bit_shift;
255 aux_len = it.options[COMEDI_DEVCONF_AUX_DATA_LENGTH];
256 if (aux_len < 0)
257 return -EFAULT;
258
259 aux_data = vmalloc(aux_len);
260 if (!aux_data)
261 return -ENOMEM;
262
263 if (copy_from_user(aux_data,
264 comedi_aux_data(it.options, 0), aux_len)) {
265 vfree(aux_data);
266 return -EFAULT;
267 }
268 it.options[COMEDI_DEVCONF_AUX_DATA_LO] =
269 (unsigned long)aux_data;
270 if (sizeof(void *) > sizeof(int)) {
271 bit_shift = sizeof(int) * 8;
272 it.options[COMEDI_DEVCONF_AUX_DATA_HI] =
273 ((unsigned long)aux_data) >> bit_shift;
274 } else
275 it.options[COMEDI_DEVCONF_AUX_DATA_HI] = 0;
276 }
277
278 ret = comedi_device_attach(dev, &it);
279 if (ret == 0) {
280 if (!try_module_get(dev->driver->module)) {
281 comedi_device_detach(dev);
282 return -ENOSYS;
283 }
284 }
285
286 if (aux_data)
287 vfree(aux_data);
288
289 return ret;
290}
291
292/*
293 COMEDI_BUFCONFIG
294 buffer configuration ioctl
295
296 arg:
297 pointer to bufconfig structure
298
299 reads:
300 bufconfig at arg
301
302 writes:
303 modified bufconfig at arg
304
305*/
306static int do_bufconfig_ioctl(struct comedi_device *dev,
307 struct comedi_bufconfig __user *arg)
308{
309 struct comedi_bufconfig bc;
310 struct comedi_async *async;
311 struct comedi_subdevice *s;
312 int retval = 0;
313
314 if (copy_from_user(&bc, arg, sizeof(struct comedi_bufconfig)))
315 return -EFAULT;
316
317 if (bc.subdevice >= dev->n_subdevices || bc.subdevice < 0)
318 return -EINVAL;
319
320 s = dev->subdevices + bc.subdevice;
321 async = s->async;
322
323 if (!async) {
324 DPRINTK("subdevice does not have async capability\n");
325 bc.size = 0;
326 bc.maximum_size = 0;
327 goto copyback;
328 }
329
330 if (bc.maximum_size) {
331 if (!capable(CAP_SYS_ADMIN))
332 return -EPERM;
333
334 async->max_bufsize = bc.maximum_size;
335 }
336
337 if (bc.size) {
338 retval = resize_async_buffer(dev, s, async, bc.size);
339 if (retval < 0)
340 return retval;
341 }
342
343 bc.size = async->prealloc_bufsz;
344 bc.maximum_size = async->max_bufsize;
345
346copyback:
347 if (copy_to_user(arg, &bc, sizeof(struct comedi_bufconfig)))
348 return -EFAULT;
349
350 return 0;
351}
352
353/*
354 COMEDI_DEVINFO
355 device info ioctl
356
357 arg:
358 pointer to devinfo structure
359
360 reads:
361 none
362
363 writes:
364 devinfo structure
365
366*/
367static int do_devinfo_ioctl(struct comedi_device *dev,
368 struct comedi_devinfo __user *arg,
369 struct file *file)
370{
371 struct comedi_devinfo devinfo;
372 const unsigned minor = iminor(file->f_dentry->d_inode);
373 struct comedi_device_file_info *dev_file_info =
374 comedi_get_device_file_info(minor);
375 struct comedi_subdevice *read_subdev =
376 comedi_get_read_subdevice(dev_file_info);
377 struct comedi_subdevice *write_subdev =
378 comedi_get_write_subdevice(dev_file_info);
379
380 memset(&devinfo, 0, sizeof(devinfo));
381
382 /* fill devinfo structure */
383 devinfo.version_code = COMEDI_VERSION_CODE;
384 devinfo.n_subdevs = dev->n_subdevices;
385 memcpy(devinfo.driver_name, dev->driver->driver_name, COMEDI_NAMELEN);
386 memcpy(devinfo.board_name, dev->board_name, COMEDI_NAMELEN);
387
388 if (read_subdev)
389 devinfo.read_subdevice = read_subdev - dev->subdevices;
390 else
391 devinfo.read_subdevice = -1;
392
393 if (write_subdev)
394 devinfo.write_subdevice = write_subdev - dev->subdevices;
395 else
396 devinfo.write_subdevice = -1;
397
398 if (copy_to_user(arg, &devinfo, sizeof(struct comedi_devinfo)))
399 return -EFAULT;
400
401 return 0;
402}
403
404/*
405 COMEDI_SUBDINFO
406 subdevice info ioctl
407
408 arg:
409 pointer to array of subdevice info structures
410
411 reads:
412 none
413
414 writes:
415 array of subdevice info structures at arg
416
417*/
418static int do_subdinfo_ioctl(struct comedi_device *dev,
419 struct comedi_subdinfo __user *arg, void *file)
420{
421 int ret, i;
422 struct comedi_subdinfo *tmp, *us;
423 struct comedi_subdevice *s;
424
425 tmp =
426 kcalloc(dev->n_subdevices, sizeof(struct comedi_subdinfo),
427 GFP_KERNEL);
428 if (!tmp)
429 return -ENOMEM;
430
431 /* fill subdinfo structs */
432 for (i = 0; i < dev->n_subdevices; i++) {
433 s = dev->subdevices + i;
434 us = tmp + i;
435
436 us->type = s->type;
437 us->n_chan = s->n_chan;
438 us->subd_flags = s->subdev_flags;
439 if (comedi_get_subdevice_runflags(s) & SRF_RUNNING)
440 us->subd_flags |= SDF_RUNNING;
441#define TIMER_nanosec 5 /* backwards compatibility */
442 us->timer_type = TIMER_nanosec;
443 us->len_chanlist = s->len_chanlist;
444 us->maxdata = s->maxdata;
445 if (s->range_table) {
446 us->range_type =
447 (i << 24) | (0 << 16) | (s->range_table->length);
448 } else {
449 us->range_type = 0; /* XXX */
450 }
451 us->flags = s->flags;
452
453 if (s->busy)
454 us->subd_flags |= SDF_BUSY;
455 if (s->busy == file)
456 us->subd_flags |= SDF_BUSY_OWNER;
457 if (s->lock)
458 us->subd_flags |= SDF_LOCKED;
459 if (s->lock == file)
460 us->subd_flags |= SDF_LOCK_OWNER;
461 if (!s->maxdata && s->maxdata_list)
462 us->subd_flags |= SDF_MAXDATA;
463 if (s->flaglist)
464 us->subd_flags |= SDF_FLAGS;
465 if (s->range_table_list)
466 us->subd_flags |= SDF_RANGETYPE;
467 if (s->do_cmd)
468 us->subd_flags |= SDF_CMD;
469
470 if (s->insn_bits != &insn_inval)
471 us->insn_bits_support = COMEDI_SUPPORTED;
472 else
473 us->insn_bits_support = COMEDI_UNSUPPORTED;
474
475 us->settling_time_0 = s->settling_time_0;
476 }
477
478 ret = copy_to_user(arg, tmp,
479 dev->n_subdevices * sizeof(struct comedi_subdinfo));
480
481 kfree(tmp);
482
483 return ret ? -EFAULT : 0;
484}
485
486/*
487 COMEDI_CHANINFO
488 subdevice info ioctl
489
490 arg:
491 pointer to chaninfo structure
492
493 reads:
494 chaninfo structure at arg
495
496 writes:
497 arrays at elements of chaninfo structure
498
499*/
500static int do_chaninfo_ioctl(struct comedi_device *dev,
501 struct comedi_chaninfo __user *arg)
502{
503 struct comedi_subdevice *s;
504 struct comedi_chaninfo it;
505
506 if (copy_from_user(&it, arg, sizeof(struct comedi_chaninfo)))
507 return -EFAULT;
508
509 if (it.subdev >= dev->n_subdevices)
510 return -EINVAL;
511 s = dev->subdevices + it.subdev;
512
513 if (it.maxdata_list) {
514 if (s->maxdata || !s->maxdata_list)
515 return -EINVAL;
516 if (copy_to_user(it.maxdata_list, s->maxdata_list,
517 s->n_chan * sizeof(unsigned int)))
518 return -EFAULT;
519 }
520
521 if (it.flaglist) {
522 if (!s->flaglist)
523 return -EINVAL;
524 if (copy_to_user(it.flaglist, s->flaglist,
525 s->n_chan * sizeof(unsigned int)))
526 return -EFAULT;
527 }
528
529 if (it.rangelist) {
530 int i;
531
532 if (!s->range_table_list)
533 return -EINVAL;
534 for (i = 0; i < s->n_chan; i++) {
535 int x;
536
537 x = (dev->minor << 28) | (it.subdev << 24) | (i << 16) |
538 (s->range_table_list[i]->length);
539 put_user(x, it.rangelist + i);
540 }
541#if 0
542 if (copy_to_user(it.rangelist, s->range_type_list,
543 s->n_chan * sizeof(unsigned int)))
544 return -EFAULT;
545#endif
546 }
547
548 return 0;
549}
550
551 /*
552 COMEDI_BUFINFO
553 buffer information ioctl
554
555 arg:
556 pointer to bufinfo structure
557
558 reads:
559 bufinfo at arg
560
561 writes:
562 modified bufinfo at arg
563
564 */
565static int do_bufinfo_ioctl(struct comedi_device *dev,
566 struct comedi_bufinfo __user *arg)
567{
568 struct comedi_bufinfo bi;
569 struct comedi_subdevice *s;
570 struct comedi_async *async;
571
572 if (copy_from_user(&bi, arg, sizeof(struct comedi_bufinfo)))
573 return -EFAULT;
574
575 if (bi.subdevice >= dev->n_subdevices || bi.subdevice < 0)
576 return -EINVAL;
577
578 s = dev->subdevices + bi.subdevice;
579 async = s->async;
580
581 if (!async) {
582 DPRINTK("subdevice does not have async capability\n");
583 bi.buf_write_ptr = 0;
584 bi.buf_read_ptr = 0;
585 bi.buf_write_count = 0;
586 bi.buf_read_count = 0;
587 goto copyback;
588 }
589
590 if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) {
591 bi.bytes_read = comedi_buf_read_alloc(async, bi.bytes_read);
592 comedi_buf_read_free(async, bi.bytes_read);
593
594 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR |
595 SRF_RUNNING))
596 && async->buf_write_count == async->buf_read_count) {
597 do_become_nonbusy(dev, s);
598 }
599 }
600
601 if (bi.bytes_written && (s->subdev_flags & SDF_CMD_WRITE)) {
602 bi.bytes_written =
603 comedi_buf_write_alloc(async, bi.bytes_written);
604 comedi_buf_write_free(async, bi.bytes_written);
605 }
606
607 bi.buf_write_count = async->buf_write_count;
608 bi.buf_write_ptr = async->buf_write_ptr;
609 bi.buf_read_count = async->buf_read_count;
610 bi.buf_read_ptr = async->buf_read_ptr;
611
612copyback:
613 if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo)))
614 return -EFAULT;
615
616 return 0;
617}
618
619static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
620 unsigned int *data, void *file);
621/*
622 * COMEDI_INSNLIST
623 * synchronous instructions
624 *
625 * arg:
626 * pointer to sync cmd structure
627 *
628 * reads:
629 * sync cmd struct at arg
630 * instruction list
631 * data (for writes)
632 *
633 * writes:
634 * data (for reads)
635 */
636/* arbitrary limits */
637#define MAX_SAMPLES 256
638static int do_insnlist_ioctl(struct comedi_device *dev,
639 struct comedi_insnlist __user *arg, void *file)
640{
641 struct comedi_insnlist insnlist;
642 struct comedi_insn *insns = NULL;
643 unsigned int *data = NULL;
644 int i = 0;
645 int ret = 0;
646
647 if (copy_from_user(&insnlist, arg, sizeof(struct comedi_insnlist)))
648 return -EFAULT;
649
650 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
651 if (!data) {
652 DPRINTK("kmalloc failed\n");
653 ret = -ENOMEM;
654 goto error;
655 }
656
657 insns =
658 kmalloc(sizeof(struct comedi_insn) * insnlist.n_insns, GFP_KERNEL);
659 if (!insns) {
660 DPRINTK("kmalloc failed\n");
661 ret = -ENOMEM;
662 goto error;
663 }
664
665 if (copy_from_user(insns, insnlist.insns,
666 sizeof(struct comedi_insn) * insnlist.n_insns)) {
667 DPRINTK("copy_from_user failed\n");
668 ret = -EFAULT;
669 goto error;
670 }
671
672 for (i = 0; i < insnlist.n_insns; i++) {
673 if (insns[i].n > MAX_SAMPLES) {
674 DPRINTK("number of samples too large\n");
675 ret = -EINVAL;
676 goto error;
677 }
678 if (insns[i].insn & INSN_MASK_WRITE) {
679 if (copy_from_user(data, insns[i].data,
680 insns[i].n * sizeof(unsigned int))) {
681 DPRINTK("copy_from_user failed\n");
682 ret = -EFAULT;
683 goto error;
684 }
685 }
686 ret = parse_insn(dev, insns + i, data, file);
687 if (ret < 0)
688 goto error;
689 if (insns[i].insn & INSN_MASK_READ) {
690 if (copy_to_user(insns[i].data, data,
691 insns[i].n * sizeof(unsigned int))) {
692 DPRINTK("copy_to_user failed\n");
693 ret = -EFAULT;
694 goto error;
695 }
696 }
697 if (need_resched())
698 schedule();
699 }
700
701error:
702 kfree(insns);
703 kfree(data);
704
705 if (ret < 0)
706 return ret;
707 return i;
708}
709
710static int check_insn_config_length(struct comedi_insn *insn,
711 unsigned int *data)
712{
713 if (insn->n < 1)
714 return -EINVAL;
715
716 switch (data[0]) {
717 case INSN_CONFIG_DIO_OUTPUT:
718 case INSN_CONFIG_DIO_INPUT:
719 case INSN_CONFIG_DISARM:
720 case INSN_CONFIG_RESET:
721 if (insn->n == 1)
722 return 0;
723 break;
724 case INSN_CONFIG_ARM:
725 case INSN_CONFIG_DIO_QUERY:
726 case INSN_CONFIG_BLOCK_SIZE:
727 case INSN_CONFIG_FILTER:
728 case INSN_CONFIG_SERIAL_CLOCK:
729 case INSN_CONFIG_BIDIRECTIONAL_DATA:
730 case INSN_CONFIG_ALT_SOURCE:
731 case INSN_CONFIG_SET_COUNTER_MODE:
732 case INSN_CONFIG_8254_READ_STATUS:
733 case INSN_CONFIG_SET_ROUTING:
734 case INSN_CONFIG_GET_ROUTING:
735 case INSN_CONFIG_GET_PWM_STATUS:
736 case INSN_CONFIG_PWM_SET_PERIOD:
737 case INSN_CONFIG_PWM_GET_PERIOD:
738 if (insn->n == 2)
739 return 0;
740 break;
741 case INSN_CONFIG_SET_GATE_SRC:
742 case INSN_CONFIG_GET_GATE_SRC:
743 case INSN_CONFIG_SET_CLOCK_SRC:
744 case INSN_CONFIG_GET_CLOCK_SRC:
745 case INSN_CONFIG_SET_OTHER_SRC:
746 case INSN_CONFIG_GET_COUNTER_STATUS:
747 case INSN_CONFIG_PWM_SET_H_BRIDGE:
748 case INSN_CONFIG_PWM_GET_H_BRIDGE:
749 case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE:
750 if (insn->n == 3)
751 return 0;
752 break;
753 case INSN_CONFIG_PWM_OUTPUT:
754 case INSN_CONFIG_ANALOG_TRIG:
755 if (insn->n == 5)
756 return 0;
757 break;
758 /* by default we allow the insn since we don't have checks for
759 * all possible cases yet */
760 default:
761 printk(KERN_WARNING
762 "comedi: no check for data length of config insn id "
763 "%i is implemented.\n"
764 " Add a check to %s in %s.\n"
765 " Assuming n=%i is correct.\n", data[0], __func__,
766 __FILE__, insn->n);
767 return 0;
768 break;
769 }
770 return -EINVAL;
771}
772
773static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
774 unsigned int *data, void *file)
775{
776 struct comedi_subdevice *s;
777 int ret = 0;
778 int i;
779
780 if (insn->insn & INSN_MASK_SPECIAL) {
781 /* a non-subdevice instruction */
782
783 switch (insn->insn) {
784 case INSN_GTOD:
785 {
786 struct timeval tv;
787
788 if (insn->n != 2) {
789 ret = -EINVAL;
790 break;
791 }
792
793 do_gettimeofday(&tv);
794 data[0] = tv.tv_sec;
795 data[1] = tv.tv_usec;
796 ret = 2;
797
798 break;
799 }
800 case INSN_WAIT:
801 if (insn->n != 1 || data[0] >= 100000) {
802 ret = -EINVAL;
803 break;
804 }
805 udelay(data[0] / 1000);
806 ret = 1;
807 break;
808 case INSN_INTTRIG:
809 if (insn->n != 1) {
810 ret = -EINVAL;
811 break;
812 }
813 if (insn->subdev >= dev->n_subdevices) {
814 DPRINTK("%d not usable subdevice\n",
815 insn->subdev);
816 ret = -EINVAL;
817 break;
818 }
819 s = dev->subdevices + insn->subdev;
820 if (!s->async) {
821 DPRINTK("no async\n");
822 ret = -EINVAL;
823 break;
824 }
825 if (!s->async->inttrig) {
826 DPRINTK("no inttrig\n");
827 ret = -EAGAIN;
828 break;
829 }
830 ret = s->async->inttrig(dev, s, insn->data[0]);
831 if (ret >= 0)
832 ret = 1;
833 break;
834 default:
835 DPRINTK("invalid insn\n");
836 ret = -EINVAL;
837 break;
838 }
839 } else {
840 /* a subdevice instruction */
841 unsigned int maxdata;
842
843 if (insn->subdev >= dev->n_subdevices) {
844 DPRINTK("subdevice %d out of range\n", insn->subdev);
845 ret = -EINVAL;
846 goto out;
847 }
848 s = dev->subdevices + insn->subdev;
849
850 if (s->type == COMEDI_SUBD_UNUSED) {
851 DPRINTK("%d not usable subdevice\n", insn->subdev);
852 ret = -EIO;
853 goto out;
854 }
855
856 /* are we locked? (ioctl lock) */
857 if (s->lock && s->lock != file) {
858 DPRINTK("device locked\n");
859 ret = -EACCES;
860 goto out;
861 }
862
863 ret = comedi_check_chanlist(s, 1, &insn->chanspec);
864 if (ret < 0) {
865 ret = -EINVAL;
866 DPRINTK("bad chanspec\n");
867 goto out;
868 }
869
870 if (s->busy) {
871 ret = -EBUSY;
872 goto out;
873 }
874 /* This looks arbitrary. It is. */
875 s->busy = &parse_insn;
876 switch (insn->insn) {
877 case INSN_READ:
878 ret = s->insn_read(dev, s, insn, data);
879 break;
880 case INSN_WRITE:
881 maxdata = s->maxdata_list
882 ? s->maxdata_list[CR_CHAN(insn->chanspec)]
883 : s->maxdata;
884 for (i = 0; i < insn->n; ++i) {
885 if (data[i] > maxdata) {
886 ret = -EINVAL;
887 DPRINTK("bad data value(s)\n");
888 break;
889 }
890 }
891 if (ret == 0)
892 ret = s->insn_write(dev, s, insn, data);
893 break;
894 case INSN_BITS:
895 if (insn->n != 2) {
896 ret = -EINVAL;
897 break;
898 }
899 ret = s->insn_bits(dev, s, insn, data);
900 break;
901 case INSN_CONFIG:
902 ret = check_insn_config_length(insn, data);
903 if (ret)
904 break;
905 ret = s->insn_config(dev, s, insn, data);
906 break;
907 default:
908 ret = -EINVAL;
909 break;
910 }
911
912 s->busy = NULL;
913 }
914
915out:
916 return ret;
917}
918
919/*
920 * COMEDI_INSN
921 * synchronous instructions
922 *
923 * arg:
924 * pointer to insn
925 *
926 * reads:
927 * struct comedi_insn struct at arg
928 * data (for writes)
929 *
930 * writes:
931 * data (for reads)
932 */
933static int do_insn_ioctl(struct comedi_device *dev,
934 struct comedi_insn __user *arg, void *file)
935{
936 struct comedi_insn insn;
937 unsigned int *data = NULL;
938 int ret = 0;
939
940 data = kmalloc(sizeof(unsigned int) * MAX_SAMPLES, GFP_KERNEL);
941 if (!data) {
942 ret = -ENOMEM;
943 goto error;
944 }
945
946 if (copy_from_user(&insn, arg, sizeof(struct comedi_insn))) {
947 ret = -EFAULT;
948 goto error;
949 }
950
951 /* This is where the behavior of insn and insnlist deviate. */
952 if (insn.n > MAX_SAMPLES)
953 insn.n = MAX_SAMPLES;
954 if (insn.insn & INSN_MASK_WRITE) {
955 if (copy_from_user(data,
956 insn.data,
957 insn.n * sizeof(unsigned int))) {
958 ret = -EFAULT;
959 goto error;
960 }
961 }
962 ret = parse_insn(dev, &insn, data, file);
963 if (ret < 0)
964 goto error;
965 if (insn.insn & INSN_MASK_READ) {
966 if (copy_to_user(insn.data,
967 data,
968 insn.n * sizeof(unsigned int))) {
969 ret = -EFAULT;
970 goto error;
971 }
972 }
973 ret = insn.n;
974
975error:
976 kfree(data);
977
978 return ret;
979}
980
981static void comedi_set_subdevice_runflags(struct comedi_subdevice *s,
982 unsigned mask, unsigned bits)
983{
984 unsigned long flags;
985
986 spin_lock_irqsave(&s->spin_lock, flags);
987 s->runflags &= ~mask;
988 s->runflags |= (bits & mask);
989 spin_unlock_irqrestore(&s->spin_lock, flags);
990}
991
992static int do_cmd_ioctl(struct comedi_device *dev,
993 struct comedi_cmd __user *cmd, void *file)
994{
995 struct comedi_cmd user_cmd;
996 struct comedi_subdevice *s;
997 struct comedi_async *async;
998 int ret = 0;
999 unsigned int __user *chanlist_saver = NULL;
1000
1001 if (copy_from_user(&user_cmd, cmd, sizeof(struct comedi_cmd))) {
1002 DPRINTK("bad cmd address\n");
1003 return -EFAULT;
1004 }
1005 /* save user's chanlist pointer so it can be restored later */
1006 chanlist_saver = user_cmd.chanlist;
1007
1008 if (user_cmd.subdev >= dev->n_subdevices) {
1009 DPRINTK("%d no such subdevice\n", user_cmd.subdev);
1010 return -ENODEV;
1011 }
1012
1013 s = dev->subdevices + user_cmd.subdev;
1014 async = s->async;
1015
1016 if (s->type == COMEDI_SUBD_UNUSED) {
1017 DPRINTK("%d not valid subdevice\n", user_cmd.subdev);
1018 return -EIO;
1019 }
1020
1021 if (!s->do_cmd || !s->do_cmdtest || !s->async) {
1022 DPRINTK("subdevice %i does not support commands\n",
1023 user_cmd.subdev);
1024 return -EIO;
1025 }
1026
1027 /* are we locked? (ioctl lock) */
1028 if (s->lock && s->lock != file) {
1029 DPRINTK("subdevice locked\n");
1030 return -EACCES;
1031 }
1032
1033 /* are we busy? */
1034 if (s->busy) {
1035 DPRINTK("subdevice busy\n");
1036 return -EBUSY;
1037 }
1038 s->busy = file;
1039
1040 /* make sure channel/gain list isn't too long */
1041 if (user_cmd.chanlist_len > s->len_chanlist) {
1042 DPRINTK("channel/gain list too long %u > %d\n",
1043 user_cmd.chanlist_len, s->len_chanlist);
1044 ret = -EINVAL;
1045 goto cleanup;
1046 }
1047
1048 /* make sure channel/gain list isn't too short */
1049 if (user_cmd.chanlist_len < 1) {
1050 DPRINTK("channel/gain list too short %u < 1\n",
1051 user_cmd.chanlist_len);
1052 ret = -EINVAL;
1053 goto cleanup;
1054 }
1055
1056 kfree(async->cmd.chanlist);
1057 async->cmd = user_cmd;
1058 async->cmd.data = NULL;
1059 /* load channel/gain list */
1060 async->cmd.chanlist =
1061 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1062 if (!async->cmd.chanlist) {
1063 DPRINTK("allocation failed\n");
1064 ret = -ENOMEM;
1065 goto cleanup;
1066 }
1067
1068 if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist,
1069 async->cmd.chanlist_len * sizeof(int))) {
1070 DPRINTK("fault reading chanlist\n");
1071 ret = -EFAULT;
1072 goto cleanup;
1073 }
1074
1075 /* make sure each element in channel/gain list is valid */
1076 ret = comedi_check_chanlist(s,
1077 async->cmd.chanlist_len,
1078 async->cmd.chanlist);
1079 if (ret < 0) {
1080 DPRINTK("bad chanlist\n");
1081 goto cleanup;
1082 }
1083
1084 ret = s->do_cmdtest(dev, s, &async->cmd);
1085
1086 if (async->cmd.flags & TRIG_BOGUS || ret) {
1087 DPRINTK("test returned %d\n", ret);
1088 user_cmd = async->cmd;
1089 /* restore chanlist pointer before copying back */
1090 user_cmd.chanlist = chanlist_saver;
1091 user_cmd.data = NULL;
1092 if (copy_to_user(cmd, &user_cmd, sizeof(struct comedi_cmd))) {
1093 DPRINTK("fault writing cmd\n");
1094 ret = -EFAULT;
1095 goto cleanup;
1096 }
1097 ret = -EAGAIN;
1098 goto cleanup;
1099 }
1100
1101 if (!async->prealloc_bufsz) {
1102 ret = -ENOMEM;
1103 DPRINTK("no buffer (?)\n");
1104 goto cleanup;
1105 }
1106
1107 comedi_reset_async_buf(async);
1108
1109 async->cb_mask =
1110 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
1111 COMEDI_CB_OVERFLOW;
1112 if (async->cmd.flags & TRIG_WAKE_EOS)
1113 async->cb_mask |= COMEDI_CB_EOS;
1114
1115 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
1116
1117 ret = s->do_cmd(dev, s);
1118 if (ret == 0)
1119 return 0;
1120
1121cleanup:
1122 do_become_nonbusy(dev, s);
1123
1124 return ret;
1125}
1126
1127/*
1128 COMEDI_CMDTEST
1129 command testing ioctl
1130
1131 arg:
1132 pointer to cmd structure
1133
1134 reads:
1135 cmd structure at arg
1136 channel/range list
1137
1138 writes:
1139 modified cmd structure at arg
1140
1141*/
1142static int do_cmdtest_ioctl(struct comedi_device *dev,
1143 struct comedi_cmd __user *arg, void *file)
1144{
1145 struct comedi_cmd user_cmd;
1146 struct comedi_subdevice *s;
1147 int ret = 0;
1148 unsigned int *chanlist = NULL;
1149 unsigned int __user *chanlist_saver = NULL;
1150
1151 if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) {
1152 DPRINTK("bad cmd address\n");
1153 return -EFAULT;
1154 }
1155 /* save user's chanlist pointer so it can be restored later */
1156 chanlist_saver = user_cmd.chanlist;
1157
1158 if (user_cmd.subdev >= dev->n_subdevices) {
1159 DPRINTK("%d no such subdevice\n", user_cmd.subdev);
1160 return -ENODEV;
1161 }
1162
1163 s = dev->subdevices + user_cmd.subdev;
1164 if (s->type == COMEDI_SUBD_UNUSED) {
1165 DPRINTK("%d not valid subdevice\n", user_cmd.subdev);
1166 return -EIO;
1167 }
1168
1169 if (!s->do_cmd || !s->do_cmdtest) {
1170 DPRINTK("subdevice %i does not support commands\n",
1171 user_cmd.subdev);
1172 return -EIO;
1173 }
1174
1175 /* make sure channel/gain list isn't too long */
1176 if (user_cmd.chanlist_len > s->len_chanlist) {
1177 DPRINTK("channel/gain list too long %d > %d\n",
1178 user_cmd.chanlist_len, s->len_chanlist);
1179 ret = -EINVAL;
1180 goto cleanup;
1181 }
1182
1183 /* load channel/gain list */
1184 if (user_cmd.chanlist) {
1185 chanlist =
1186 kmalloc(user_cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1187 if (!chanlist) {
1188 DPRINTK("allocation failed\n");
1189 ret = -ENOMEM;
1190 goto cleanup;
1191 }
1192
1193 if (copy_from_user(chanlist, user_cmd.chanlist,
1194 user_cmd.chanlist_len * sizeof(int))) {
1195 DPRINTK("fault reading chanlist\n");
1196 ret = -EFAULT;
1197 goto cleanup;
1198 }
1199
1200 /* make sure each element in channel/gain list is valid */
1201 ret = comedi_check_chanlist(s, user_cmd.chanlist_len, chanlist);
1202 if (ret < 0) {
1203 DPRINTK("bad chanlist\n");
1204 goto cleanup;
1205 }
1206
1207 user_cmd.chanlist = chanlist;
1208 }
1209
1210 ret = s->do_cmdtest(dev, s, &user_cmd);
1211
1212 /* restore chanlist pointer before copying back */
1213 user_cmd.chanlist = chanlist_saver;
1214
1215 if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) {
1216 DPRINTK("bad cmd address\n");
1217 ret = -EFAULT;
1218 goto cleanup;
1219 }
1220cleanup:
1221 kfree(chanlist);
1222
1223 return ret;
1224}
1225
1226/*
1227 COMEDI_LOCK
1228 lock subdevice
1229
1230 arg:
1231 subdevice number
1232
1233 reads:
1234 none
1235
1236 writes:
1237 none
1238
1239*/
1240
1241static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
1242 void *file)
1243{
1244 int ret = 0;
1245 unsigned long flags;
1246 struct comedi_subdevice *s;
1247
1248 if (arg >= dev->n_subdevices)
1249 return -EINVAL;
1250 s = dev->subdevices + arg;
1251
1252 spin_lock_irqsave(&s->spin_lock, flags);
1253 if (s->busy || s->lock)
1254 ret = -EBUSY;
1255 else
1256 s->lock = file;
1257 spin_unlock_irqrestore(&s->spin_lock, flags);
1258
1259 if (ret < 0)
1260 return ret;
1261
1262#if 0
1263 if (s->lock_f)
1264 ret = s->lock_f(dev, s);
1265#endif
1266
1267 return ret;
1268}
1269
1270/*
1271 COMEDI_UNLOCK
1272 unlock subdevice
1273
1274 arg:
1275 subdevice number
1276
1277 reads:
1278 none
1279
1280 writes:
1281 none
1282
1283 This function isn't protected by the semaphore, since
1284 we already own the lock.
1285*/
1286static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
1287 void *file)
1288{
1289 struct comedi_subdevice *s;
1290
1291 if (arg >= dev->n_subdevices)
1292 return -EINVAL;
1293 s = dev->subdevices + arg;
1294
1295 if (s->busy)
1296 return -EBUSY;
1297
1298 if (s->lock && s->lock != file)
1299 return -EACCES;
1300
1301 if (s->lock == file) {
1302#if 0
1303 if (s->unlock)
1304 s->unlock(dev, s);
1305#endif
1306
1307 s->lock = NULL;
1308 }
1309
1310 return 0;
1311}
1312
1313/*
1314 COMEDI_CANCEL
1315 cancel acquisition ioctl
1316
1317 arg:
1318 subdevice number
1319
1320 reads:
1321 nothing
1322
1323 writes:
1324 nothing
1325
1326*/
1327static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
1328 void *file)
1329{
1330 struct comedi_subdevice *s;
1331
1332 if (arg >= dev->n_subdevices)
1333 return -EINVAL;
1334 s = dev->subdevices + arg;
1335 if (s->async == NULL)
1336 return -EINVAL;
1337
1338 if (s->lock && s->lock != file)
1339 return -EACCES;
1340
1341 if (!s->busy)
1342 return 0;
1343
1344 if (s->busy != file)
1345 return -EBUSY;
1346
1347 return do_cancel(dev, s);
1348}
1349
1350/*
1351 COMEDI_POLL ioctl
1352 instructs driver to synchronize buffers
1353
1354 arg:
1355 subdevice number
1356
1357 reads:
1358 nothing
1359
1360 writes:
1361 nothing
1362
1363*/
1364static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg,
1365 void *file)
1366{
1367 struct comedi_subdevice *s;
1368
1369 if (arg >= dev->n_subdevices)
1370 return -EINVAL;
1371 s = dev->subdevices + arg;
1372
1373 if (s->lock && s->lock != file)
1374 return -EACCES;
1375
1376 if (!s->busy)
1377 return 0;
1378
1379 if (s->busy != file)
1380 return -EBUSY;
1381
1382 if (s->poll)
1383 return s->poll(dev, s);
1384
1385 return -EINVAL;
1386}
1387
1388static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
1389{
1390 int ret = 0;
1391
1392 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel)
1393 ret = s->cancel(dev, s);
1394
1395 do_become_nonbusy(dev, s);
1396
1397 return ret;
1398}
1399
1400static void comedi_unmap(struct vm_area_struct *area)
1401{
1402 struct comedi_async *async;
1403 struct comedi_device *dev;
1404
1405 async = area->vm_private_data;
1406 dev = async->subdevice->device;
1407
1408 mutex_lock(&dev->mutex);
1409 async->mmap_count--;
1410 mutex_unlock(&dev->mutex);
1411}
1412
1413static struct vm_operations_struct comedi_vm_ops = {
1414 .close = comedi_unmap,
1415};
1416
1417static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
1418{
1419 const unsigned minor = iminor(file->f_dentry->d_inode);
1420 struct comedi_device_file_info *dev_file_info =
1421 comedi_get_device_file_info(minor);
1422 struct comedi_device *dev = dev_file_info->device;
1423 struct comedi_async *async = NULL;
1424 unsigned long start = vma->vm_start;
1425 unsigned long size;
1426 int n_pages;
1427 int i;
1428 int retval;
1429 struct comedi_subdevice *s;
1430
1431 mutex_lock(&dev->mutex);
1432 if (!dev->attached) {
1433 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1434 retval = -ENODEV;
1435 goto done;
1436 }
1437 if (vma->vm_flags & VM_WRITE)
1438 s = comedi_get_write_subdevice(dev_file_info);
1439 else
1440 s = comedi_get_read_subdevice(dev_file_info);
1441
1442 if (s == NULL) {
1443 retval = -EINVAL;
1444 goto done;
1445 }
1446 async = s->async;
1447 if (async == NULL) {
1448 retval = -EINVAL;
1449 goto done;
1450 }
1451
1452 if (vma->vm_pgoff != 0) {
1453 DPRINTK("comedi: mmap() offset must be 0.\n");
1454 retval = -EINVAL;
1455 goto done;
1456 }
1457
1458 size = vma->vm_end - vma->vm_start;
1459 if (size > async->prealloc_bufsz) {
1460 retval = -EFAULT;
1461 goto done;
1462 }
1463 if (size & (~PAGE_MASK)) {
1464 retval = -EFAULT;
1465 goto done;
1466 }
1467
1468 n_pages = size >> PAGE_SHIFT;
1469 for (i = 0; i < n_pages; ++i) {
1470 if (remap_pfn_range(vma, start,
1471 page_to_pfn(virt_to_page
1472 (async->buf_page_list
1473 [i].virt_addr)), PAGE_SIZE,
1474 PAGE_SHARED)) {
1475 retval = -EAGAIN;
1476 goto done;
1477 }
1478 start += PAGE_SIZE;
1479 }
1480
1481 vma->vm_ops = &comedi_vm_ops;
1482 vma->vm_private_data = async;
1483
1484 async->mmap_count++;
1485
1486 retval = 0;
1487done:
1488 mutex_unlock(&dev->mutex);
1489 return retval;
1490}
1491
1492static unsigned int comedi_poll(struct file *file, poll_table * wait)
1493{
1494 unsigned int mask = 0;
1495 const unsigned minor = iminor(file->f_dentry->d_inode);
1496 struct comedi_device_file_info *dev_file_info =
1497 comedi_get_device_file_info(minor);
1498 struct comedi_device *dev = dev_file_info->device;
1499 struct comedi_subdevice *read_subdev;
1500 struct comedi_subdevice *write_subdev;
1501
1502 mutex_lock(&dev->mutex);
1503 if (!dev->attached) {
1504 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1505 mutex_unlock(&dev->mutex);
1506 return 0;
1507 }
1508
1509 mask = 0;
1510 read_subdev = comedi_get_read_subdevice(dev_file_info);
1511 if (read_subdev) {
1512 poll_wait(file, &read_subdev->async->wait_head, wait);
1513 if (!read_subdev->busy
1514 || comedi_buf_read_n_available(read_subdev->async) > 0
1515 || !(comedi_get_subdevice_runflags(read_subdev) &
1516 SRF_RUNNING)) {
1517 mask |= POLLIN | POLLRDNORM;
1518 }
1519 }
1520 write_subdev = comedi_get_write_subdevice(dev_file_info);
1521 if (write_subdev) {
1522 poll_wait(file, &write_subdev->async->wait_head, wait);
1523 comedi_buf_write_alloc(write_subdev->async,
1524 write_subdev->async->prealloc_bufsz);
1525 if (!write_subdev->busy
1526 || !(comedi_get_subdevice_runflags(write_subdev) &
1527 SRF_RUNNING)
1528 || comedi_buf_write_n_allocated(write_subdev->async) >=
1529 bytes_per_sample(write_subdev->async->subdevice)) {
1530 mask |= POLLOUT | POLLWRNORM;
1531 }
1532 }
1533
1534 mutex_unlock(&dev->mutex);
1535 return mask;
1536}
1537
1538static ssize_t comedi_write(struct file *file, const char __user *buf,
1539 size_t nbytes, loff_t *offset)
1540{
1541 struct comedi_subdevice *s;
1542 struct comedi_async *async;
1543 int n, m, count = 0, retval = 0;
1544 DECLARE_WAITQUEUE(wait, current);
1545 const unsigned minor = iminor(file->f_dentry->d_inode);
1546 struct comedi_device_file_info *dev_file_info =
1547 comedi_get_device_file_info(minor);
1548 struct comedi_device *dev = dev_file_info->device;
1549
1550 if (!dev->attached) {
1551 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1552 retval = -ENODEV;
1553 goto done;
1554 }
1555
1556 s = comedi_get_write_subdevice(dev_file_info);
1557 if (s == NULL) {
1558 retval = -EIO;
1559 goto done;
1560 }
1561 async = s->async;
1562
1563 if (!nbytes) {
1564 retval = 0;
1565 goto done;
1566 }
1567 if (!s->busy) {
1568 retval = 0;
1569 goto done;
1570 }
1571 if (s->busy != file) {
1572 retval = -EACCES;
1573 goto done;
1574 }
1575 add_wait_queue(&async->wait_head, &wait);
1576 while (nbytes > 0 && !retval) {
1577 set_current_state(TASK_INTERRUPTIBLE);
1578
1579 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1580 if (count == 0) {
1581 if (comedi_get_subdevice_runflags(s) &
1582 SRF_ERROR) {
1583 retval = -EPIPE;
1584 } else {
1585 retval = 0;
1586 }
1587 do_become_nonbusy(dev, s);
1588 }
1589 break;
1590 }
1591
1592 n = nbytes;
1593
1594 m = n;
1595 if (async->buf_write_ptr + m > async->prealloc_bufsz)
1596 m = async->prealloc_bufsz - async->buf_write_ptr;
1597 comedi_buf_write_alloc(async, async->prealloc_bufsz);
1598 if (m > comedi_buf_write_n_allocated(async))
1599 m = comedi_buf_write_n_allocated(async);
1600 if (m < n)
1601 n = m;
1602
1603 if (n == 0) {
1604 if (file->f_flags & O_NONBLOCK) {
1605 retval = -EAGAIN;
1606 break;
1607 }
1608 if (signal_pending(current)) {
1609 retval = -ERESTARTSYS;
1610 break;
1611 }
1612 schedule();
1613 if (!s->busy)
1614 break;
1615 if (s->busy != file) {
1616 retval = -EACCES;
1617 break;
1618 }
1619 continue;
1620 }
1621
1622 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr,
1623 buf, n);
1624 if (m) {
1625 n -= m;
1626 retval = -EFAULT;
1627 }
1628 comedi_buf_write_free(async, n);
1629
1630 count += n;
1631 nbytes -= n;
1632
1633 buf += n;
1634 break; /* makes device work like a pipe */
1635 }
1636 set_current_state(TASK_RUNNING);
1637 remove_wait_queue(&async->wait_head, &wait);
1638
1639done:
1640 return count ? count : retval;
1641}
1642
1643static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
1644 loff_t *offset)
1645{
1646 struct comedi_subdevice *s;
1647 struct comedi_async *async;
1648 int n, m, count = 0, retval = 0;
1649 DECLARE_WAITQUEUE(wait, current);
1650 const unsigned minor = iminor(file->f_dentry->d_inode);
1651 struct comedi_device_file_info *dev_file_info =
1652 comedi_get_device_file_info(minor);
1653 struct comedi_device *dev = dev_file_info->device;
1654
1655 if (!dev->attached) {
1656 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1657 retval = -ENODEV;
1658 goto done;
1659 }
1660
1661 s = comedi_get_read_subdevice(dev_file_info);
1662 if (s == NULL) {
1663 retval = -EIO;
1664 goto done;
1665 }
1666 async = s->async;
1667 if (!nbytes) {
1668 retval = 0;
1669 goto done;
1670 }
1671 if (!s->busy) {
1672 retval = 0;
1673 goto done;
1674 }
1675 if (s->busy != file) {
1676 retval = -EACCES;
1677 goto done;
1678 }
1679
1680 add_wait_queue(&async->wait_head, &wait);
1681 while (nbytes > 0 && !retval) {
1682 set_current_state(TASK_INTERRUPTIBLE);
1683
1684 n = nbytes;
1685
1686 m = comedi_buf_read_n_available(async);
1687 /* printk("%d available\n",m); */
1688 if (async->buf_read_ptr + m > async->prealloc_bufsz)
1689 m = async->prealloc_bufsz - async->buf_read_ptr;
1690 /* printk("%d contiguous\n",m); */
1691 if (m < n)
1692 n = m;
1693
1694 if (n == 0) {
1695 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1696 do_become_nonbusy(dev, s);
1697 if (comedi_get_subdevice_runflags(s) &
1698 SRF_ERROR) {
1699 retval = -EPIPE;
1700 } else {
1701 retval = 0;
1702 }
1703 break;
1704 }
1705 if (file->f_flags & O_NONBLOCK) {
1706 retval = -EAGAIN;
1707 break;
1708 }
1709 if (signal_pending(current)) {
1710 retval = -ERESTARTSYS;
1711 break;
1712 }
1713 schedule();
1714 if (!s->busy) {
1715 retval = 0;
1716 break;
1717 }
1718 if (s->busy != file) {
1719 retval = -EACCES;
1720 break;
1721 }
1722 continue;
1723 }
1724 m = copy_to_user(buf, async->prealloc_buf +
1725 async->buf_read_ptr, n);
1726 if (m) {
1727 n -= m;
1728 retval = -EFAULT;
1729 }
1730
1731 comedi_buf_read_alloc(async, n);
1732 comedi_buf_read_free(async, n);
1733
1734 count += n;
1735 nbytes -= n;
1736
1737 buf += n;
1738 break; /* makes device work like a pipe */
1739 }
1740 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) &&
1741 async->buf_read_count - async->buf_write_count == 0) {
1742 do_become_nonbusy(dev, s);
1743 }
1744 set_current_state(TASK_RUNNING);
1745 remove_wait_queue(&async->wait_head, &wait);
1746
1747done:
1748 return count ? count : retval;
1749}
1750
1751/*
1752 This function restores a subdevice to an idle state.
1753 */
1754void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s)
1755{
1756 struct comedi_async *async = s->async;
1757
1758 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
1759 if (async) {
1760 comedi_reset_async_buf(async);
1761 async->inttrig = NULL;
1762 } else {
1763 printk(KERN_ERR
1764 "BUG: (?) do_become_nonbusy called with async=0\n");
1765 }
1766
1767 s->busy = NULL;
1768}
1769
1770static int comedi_open(struct inode *inode, struct file *file)
1771{
1772 const unsigned minor = iminor(inode);
1773 struct comedi_device_file_info *dev_file_info =
1774 comedi_get_device_file_info(minor);
1775 struct comedi_device *dev =
1776 dev_file_info ? dev_file_info->device : NULL;
1777
1778 if (dev == NULL) {
1779 DPRINTK("invalid minor number\n");
1780 return -ENODEV;
1781 }
1782
1783 /* This is slightly hacky, but we want module autoloading
1784 * to work for root.
1785 * case: user opens device, attached -> ok
1786 * case: user opens device, unattached, in_request_module=0 -> autoload
1787 * case: user opens device, unattached, in_request_module=1 -> fail
1788 * case: root opens device, attached -> ok
1789 * case: root opens device, unattached, in_request_module=1 -> ok
1790 * (typically called from modprobe)
1791 * case: root opens device, unattached, in_request_module=0 -> autoload
1792 *
1793 * The last could be changed to "-> ok", which would deny root
1794 * autoloading.
1795 */
1796 mutex_lock(&dev->mutex);
1797 if (dev->attached)
1798 goto ok;
1799 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) {
1800 DPRINTK("in request module\n");
1801 mutex_unlock(&dev->mutex);
1802 return -ENODEV;
1803 }
1804 if (capable(CAP_NET_ADMIN) && dev->in_request_module)
1805 goto ok;
1806
1807 dev->in_request_module = 1;
1808
1809#ifdef CONFIG_KMOD
1810 mutex_unlock(&dev->mutex);
1811 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor);
1812 mutex_lock(&dev->mutex);
1813#endif
1814
1815 dev->in_request_module = 0;
1816
1817 if (!dev->attached && !capable(CAP_NET_ADMIN)) {
1818 DPRINTK("not attached and not CAP_NET_ADMIN\n");
1819 mutex_unlock(&dev->mutex);
1820 return -ENODEV;
1821 }
1822ok:
1823 __module_get(THIS_MODULE);
1824
1825 if (dev->attached) {
1826 if (!try_module_get(dev->driver->module)) {
1827 module_put(THIS_MODULE);
1828 mutex_unlock(&dev->mutex);
1829 return -ENOSYS;
1830 }
1831 }
1832
1833 if (dev->attached && dev->use_count == 0 && dev->open)
1834 dev->open(dev);
1835
1836 dev->use_count++;
1837
1838 mutex_unlock(&dev->mutex);
1839
1840 return 0;
1841}
1842
1843static int comedi_close(struct inode *inode, struct file *file)
1844{
1845 const unsigned minor = iminor(inode);
1846 struct comedi_device_file_info *dev_file_info =
1847 comedi_get_device_file_info(minor);
1848 struct comedi_device *dev = dev_file_info->device;
1849 struct comedi_subdevice *s = NULL;
1850 int i;
1851
1852 mutex_lock(&dev->mutex);
1853
1854 if (dev->subdevices) {
1855 for (i = 0; i < dev->n_subdevices; i++) {
1856 s = dev->subdevices + i;
1857
1858 if (s->busy == file)
1859 do_cancel(dev, s);
1860 if (s->lock == file)
1861 s->lock = NULL;
1862 }
1863 }
1864 if (dev->attached && dev->use_count == 1 && dev->close)
1865 dev->close(dev);
1866
1867 module_put(THIS_MODULE);
1868 if (dev->attached)
1869 module_put(dev->driver->module);
1870
1871 dev->use_count--;
1872
1873 mutex_unlock(&dev->mutex);
1874
1875 if (file->f_flags & FASYNC)
1876 comedi_fasync(-1, file, 0);
1877
1878 return 0;
1879}
1880
1881static int comedi_fasync(int fd, struct file *file, int on)
1882{
1883 const unsigned minor = iminor(file->f_dentry->d_inode);
1884 struct comedi_device_file_info *dev_file_info =
1885 comedi_get_device_file_info(minor);
1886
1887 struct comedi_device *dev = dev_file_info->device;
1888
1889 return fasync_helper(fd, file, on, &dev->async_queue);
1890}
1891
1892const struct file_operations comedi_fops = {
1893 .owner = THIS_MODULE,
1894 .unlocked_ioctl = comedi_unlocked_ioctl,
1895 .compat_ioctl = comedi_compat_ioctl,
1896 .open = comedi_open,
1897 .release = comedi_close,
1898 .read = comedi_read,
1899 .write = comedi_write,
1900 .mmap = comedi_mmap,
1901 .poll = comedi_poll,
1902 .fasync = comedi_fasync,
1903};
1904
1905struct class *comedi_class;
1906static struct cdev comedi_cdev;
1907
1908static void comedi_cleanup_legacy_minors(void)
1909{
1910 unsigned i;
1911
1912 for (i = 0; i < comedi_num_legacy_minors; i++)
1913 comedi_free_board_minor(i);
1914}
1915
1916static int __init comedi_init(void)
1917{
1918 int i;
1919 int retval;
1920
1921 printk(KERN_INFO "comedi: version " COMEDI_RELEASE
1922 " - http://www.comedi.org\n");
1923
1924 if (comedi_num_legacy_minors < 0 ||
1925 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
1926 printk(KERN_ERR "comedi: error: invalid value for module "
1927 "parameter \"comedi_num_legacy_minors\". Valid values "
1928 "are 0 through %i.\n", COMEDI_NUM_BOARD_MINORS);
1929 return -EINVAL;
1930 }
1931
1932 /*
1933 * comedi is unusable if both comedi_autoconfig and
1934 * comedi_num_legacy_minors are zero, so we might as well adjust the
1935 * defaults in that case
1936 */
1937 if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0)
1938 comedi_num_legacy_minors = 16;
1939
1940 memset(comedi_file_info_table, 0,
1941 sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS);
1942
1943 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
1944 COMEDI_NUM_MINORS, "comedi");
1945 if (retval)
1946 return -EIO;
1947 cdev_init(&comedi_cdev, &comedi_fops);
1948 comedi_cdev.owner = THIS_MODULE;
1949 kobject_set_name(&comedi_cdev.kobj, "comedi");
1950 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
1951 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
1952 COMEDI_NUM_MINORS);
1953 return -EIO;
1954 }
1955 comedi_class = class_create(THIS_MODULE, "comedi");
1956 if (IS_ERR(comedi_class)) {
1957 printk(KERN_ERR "comedi: failed to create class");
1958 cdev_del(&comedi_cdev);
1959 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
1960 COMEDI_NUM_MINORS);
1961 return PTR_ERR(comedi_class);
1962 }
1963
1964 /* XXX requires /proc interface */
1965 comedi_proc_init();
1966
1967 /* create devices files for legacy/manual use */
1968 for (i = 0; i < comedi_num_legacy_minors; i++) {
1969 int minor;
1970 minor = comedi_alloc_board_minor(NULL);
1971 if (minor < 0) {
1972 comedi_cleanup_legacy_minors();
1973 cdev_del(&comedi_cdev);
1974 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
1975 COMEDI_NUM_MINORS);
1976 return minor;
1977 }
1978 }
1979
1980 return 0;
1981}
1982
1983static void __exit comedi_cleanup(void)
1984{
1985 int i;
1986
1987 comedi_cleanup_legacy_minors();
1988 for (i = 0; i < COMEDI_NUM_MINORS; ++i)
1989 BUG_ON(comedi_file_info_table[i]);
1990
1991 class_destroy(comedi_class);
1992 cdev_del(&comedi_cdev);
1993 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
1994
1995 comedi_proc_cleanup();
1996}
1997
1998module_init(comedi_init);
1999module_exit(comedi_cleanup);
2000
2001void comedi_error(const struct comedi_device *dev, const char *s)
2002{
2003 printk(KERN_ERR "comedi%d: %s: %s\n", dev->minor,
2004 dev->driver->driver_name, s);
2005}
2006EXPORT_SYMBOL(comedi_error);
2007
2008void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
2009{
2010 struct comedi_async *async = s->async;
2011 unsigned runflags = 0;
2012 unsigned runflags_mask = 0;
2013
2014 /* DPRINTK("comedi_event 0x%x\n",mask); */
2015
2016 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0)
2017 return;
2018
2019 if (s->
2020 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR |
2021 COMEDI_CB_OVERFLOW)) {
2022 runflags_mask |= SRF_RUNNING;
2023 }
2024 /* remember if an error event has occured, so an error
2025 * can be returned the next time the user does a read() */
2026 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
2027 runflags_mask |= SRF_ERROR;
2028 runflags |= SRF_ERROR;
2029 }
2030 if (runflags_mask) {
2031 /*sets SRF_ERROR and SRF_RUNNING together atomically */
2032 comedi_set_subdevice_runflags(s, runflags_mask, runflags);
2033 }
2034
2035 if (async->cb_mask & s->async->events) {
2036 if (comedi_get_subdevice_runflags(s) & SRF_USER) {
2037 wake_up_interruptible(&async->wait_head);
2038 if (s->subdev_flags & SDF_CMD_READ)
2039 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
2040 if (s->subdev_flags & SDF_CMD_WRITE)
2041 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT);
2042 } else {
2043 if (async->cb_func)
2044 async->cb_func(s->async->events, async->cb_arg);
2045 }
2046 }
2047 s->async->events = 0;
2048}
2049EXPORT_SYMBOL(comedi_event);
2050
2051unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s)
2052{
2053 unsigned long flags;
2054 unsigned runflags;
2055
2056 spin_lock_irqsave(&s->spin_lock, flags);
2057 runflags = s->runflags;
2058 spin_unlock_irqrestore(&s->spin_lock, flags);
2059 return runflags;
2060}
2061EXPORT_SYMBOL(comedi_get_subdevice_runflags);
2062
2063static int is_device_busy(struct comedi_device *dev)
2064{
2065 struct comedi_subdevice *s;
2066 int i;
2067
2068 if (!dev->attached)
2069 return 0;
2070
2071 for (i = 0; i < dev->n_subdevices; i++) {
2072 s = dev->subdevices + i;
2073 if (s->busy)
2074 return 1;
2075 if (s->async && s->async->mmap_count)
2076 return 1;
2077 }
2078
2079 return 0;
2080}
2081
2082static void comedi_device_init(struct comedi_device *dev)
2083{
2084 memset(dev, 0, sizeof(struct comedi_device));
2085 spin_lock_init(&dev->spinlock);
2086 mutex_init(&dev->mutex);
2087 dev->minor = -1;
2088}
2089
2090static void comedi_device_cleanup(struct comedi_device *dev)
2091{
2092 if (dev == NULL)
2093 return;
2094 mutex_lock(&dev->mutex);
2095 comedi_device_detach(dev);
2096 mutex_unlock(&dev->mutex);
2097 mutex_destroy(&dev->mutex);
2098}
2099
2100int comedi_alloc_board_minor(struct device *hardware_device)
2101{
2102 unsigned long flags;
2103 struct comedi_device_file_info *info;
2104 struct device *csdev;
2105 unsigned i;
2106 int retval;
2107
2108 info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
2109 if (info == NULL)
2110 return -ENOMEM;
2111 info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL);
2112 if (info->device == NULL) {
2113 kfree(info);
2114 return -ENOMEM;
2115 }
2116 comedi_device_init(info->device);
2117 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2118 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) {
2119 if (comedi_file_info_table[i] == NULL) {
2120 comedi_file_info_table[i] = info;
2121 break;
2122 }
2123 }
2124 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2125 if (i == COMEDI_NUM_BOARD_MINORS) {
2126 comedi_device_cleanup(info->device);
2127 kfree(info->device);
2128 kfree(info);
2129 printk(KERN_ERR
2130 "comedi: error: "
2131 "ran out of minor numbers for board device files.\n");
2132 return -EBUSY;
2133 }
2134 info->device->minor = i;
2135 csdev = COMEDI_DEVICE_CREATE(comedi_class, NULL,
2136 MKDEV(COMEDI_MAJOR, i), NULL,
2137 hardware_device, "comedi%i", i);
2138 if (!IS_ERR(csdev))
2139 info->device->class_dev = csdev;
2140 dev_set_drvdata(csdev, info);
2141 retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb);
2142 if (retval) {
2143 printk(KERN_ERR
2144 "comedi: "
2145 "failed to create sysfs attribute file \"%s\".\n",
2146 dev_attr_max_read_buffer_kb.attr.name);
2147 comedi_free_board_minor(i);
2148 return retval;
2149 }
2150 retval = device_create_file(csdev, &dev_attr_read_buffer_kb);
2151 if (retval) {
2152 printk(KERN_ERR
2153 "comedi: "
2154 "failed to create sysfs attribute file \"%s\".\n",
2155 dev_attr_read_buffer_kb.attr.name);
2156 comedi_free_board_minor(i);
2157 return retval;
2158 }
2159 retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb);
2160 if (retval) {
2161 printk(KERN_ERR
2162 "comedi: "
2163 "failed to create sysfs attribute file \"%s\".\n",
2164 dev_attr_max_write_buffer_kb.attr.name);
2165 comedi_free_board_minor(i);
2166 return retval;
2167 }
2168 retval = device_create_file(csdev, &dev_attr_write_buffer_kb);
2169 if (retval) {
2170 printk(KERN_ERR
2171 "comedi: "
2172 "failed to create sysfs attribute file \"%s\".\n",
2173 dev_attr_write_buffer_kb.attr.name);
2174 comedi_free_board_minor(i);
2175 return retval;
2176 }
2177 return i;
2178}
2179
2180void comedi_free_board_minor(unsigned minor)
2181{
2182 unsigned long flags;
2183 struct comedi_device_file_info *info;
2184
2185 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
2186 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2187 info = comedi_file_info_table[minor];
2188 comedi_file_info_table[minor] = NULL;
2189 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2190
2191 if (info) {
2192 struct comedi_device *dev = info->device;
2193 if (dev) {
2194 if (dev->class_dev) {
2195 device_destroy(comedi_class,
2196 MKDEV(COMEDI_MAJOR, dev->minor));
2197 }
2198 comedi_device_cleanup(dev);
2199 kfree(dev);
2200 }
2201 kfree(info);
2202 }
2203}
2204
2205int comedi_alloc_subdevice_minor(struct comedi_device *dev,
2206 struct comedi_subdevice *s)
2207{
2208 unsigned long flags;
2209 struct comedi_device_file_info *info;
2210 struct device *csdev;
2211 unsigned i;
2212 int retval;
2213
2214 info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
2215 if (info == NULL)
2216 return -ENOMEM;
2217 info->device = dev;
2218 info->read_subdevice = s;
2219 info->write_subdevice = s;
2220 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2221 for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) {
2222 if (comedi_file_info_table[i] == NULL) {
2223 comedi_file_info_table[i] = info;
2224 break;
2225 }
2226 }
2227 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2228 if (i == COMEDI_NUM_MINORS) {
2229 kfree(info);
2230 printk(KERN_ERR
2231 "comedi: error: "
2232 "ran out of minor numbers for board device files.\n");
2233 return -EBUSY;
2234 }
2235 s->minor = i;
2236 csdev = COMEDI_DEVICE_CREATE(comedi_class, dev->class_dev,
2237 MKDEV(COMEDI_MAJOR, i), NULL, NULL,
2238 "comedi%i_subd%i", dev->minor,
2239 (int)(s - dev->subdevices));
2240 if (!IS_ERR(csdev))
2241 s->class_dev = csdev;
2242 dev_set_drvdata(csdev, info);
2243 retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb);
2244 if (retval) {
2245 printk(KERN_ERR
2246 "comedi: "
2247 "failed to create sysfs attribute file \"%s\".\n",
2248 dev_attr_max_read_buffer_kb.attr.name);
2249 comedi_free_subdevice_minor(s);
2250 return retval;
2251 }
2252 retval = device_create_file(csdev, &dev_attr_read_buffer_kb);
2253 if (retval) {
2254 printk(KERN_ERR
2255 "comedi: "
2256 "failed to create sysfs attribute file \"%s\".\n",
2257 dev_attr_read_buffer_kb.attr.name);
2258 comedi_free_subdevice_minor(s);
2259 return retval;
2260 }
2261 retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb);
2262 if (retval) {
2263 printk(KERN_ERR
2264 "comedi: "
2265 "failed to create sysfs attribute file \"%s\".\n",
2266 dev_attr_max_write_buffer_kb.attr.name);
2267 comedi_free_subdevice_minor(s);
2268 return retval;
2269 }
2270 retval = device_create_file(csdev, &dev_attr_write_buffer_kb);
2271 if (retval) {
2272 printk(KERN_ERR
2273 "comedi: "
2274 "failed to create sysfs attribute file \"%s\".\n",
2275 dev_attr_write_buffer_kb.attr.name);
2276 comedi_free_subdevice_minor(s);
2277 return retval;
2278 }
2279 return i;
2280}
2281
2282void comedi_free_subdevice_minor(struct comedi_subdevice *s)
2283{
2284 unsigned long flags;
2285 struct comedi_device_file_info *info;
2286
2287 if (s == NULL)
2288 return;
2289 if (s->minor < 0)
2290 return;
2291
2292 BUG_ON(s->minor >= COMEDI_NUM_MINORS);
2293 BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR);
2294
2295 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2296 info = comedi_file_info_table[s->minor];
2297 comedi_file_info_table[s->minor] = NULL;
2298 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2299
2300 if (s->class_dev) {
2301 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
2302 s->class_dev = NULL;
2303 }
2304 kfree(info);
2305}
2306
2307struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor)
2308{
2309 unsigned long flags;
2310 struct comedi_device_file_info *info;
2311
2312 BUG_ON(minor >= COMEDI_NUM_MINORS);
2313 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2314 info = comedi_file_info_table[minor];
2315 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2316 return info;
2317}
2318EXPORT_SYMBOL_GPL(comedi_get_device_file_info);
2319
2320static int resize_async_buffer(struct comedi_device *dev,
2321 struct comedi_subdevice *s,
2322 struct comedi_async *async, unsigned new_size)
2323{
2324 int retval;
2325
2326 if (new_size > async->max_bufsize)
2327 return -EPERM;
2328
2329 if (s->busy) {
2330 DPRINTK("subdevice is busy, cannot resize buffer\n");
2331 return -EBUSY;
2332 }
2333 if (async->mmap_count) {
2334 DPRINTK("subdevice is mmapped, cannot resize buffer\n");
2335 return -EBUSY;
2336 }
2337
2338 if (!async->prealloc_buf)
2339 return -EINVAL;
2340
2341 /* make sure buffer is an integral number of pages
2342 * (we round up) */
2343 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
2344
2345 retval = comedi_buf_alloc(dev, s, new_size);
2346 if (retval < 0)
2347 return retval;
2348
2349 if (s->buf_change) {
2350 retval = s->buf_change(dev, s, new_size);
2351 if (retval < 0)
2352 return retval;
2353 }
2354
2355 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
2356 dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz);
2357 return 0;
2358}
2359
2360/* sysfs attribute files */
2361
2362static const unsigned bytes_per_kibi = 1024;
2363
2364static ssize_t show_max_read_buffer_kb(struct device *dev,
2365 struct device_attribute *attr, char *buf)
2366{
2367 ssize_t retval;
2368 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2369 unsigned max_buffer_size_kb = 0;
2370 struct comedi_subdevice *const read_subdevice =
2371 comedi_get_read_subdevice(info);
2372
2373 mutex_lock(&info->device->mutex);
2374 if (read_subdevice &&
2375 (read_subdevice->subdev_flags & SDF_CMD_READ) &&
2376 read_subdevice->async) {
2377 max_buffer_size_kb = read_subdevice->async->max_bufsize /
2378 bytes_per_kibi;
2379 }
2380 retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb);
2381 mutex_unlock(&info->device->mutex);
2382
2383 return retval;
2384}
2385
2386static ssize_t store_max_read_buffer_kb(struct device *dev,
2387 struct device_attribute *attr,
2388 const char *buf, size_t count)
2389{
2390 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2391 unsigned long new_max_size_kb;
2392 uint64_t new_max_size;
2393 struct comedi_subdevice *const read_subdevice =
2394 comedi_get_read_subdevice(info);
2395
2396 if (strict_strtoul(buf, 10, &new_max_size_kb))
2397 return -EINVAL;
2398 if (new_max_size_kb != (uint32_t) new_max_size_kb)
2399 return -EINVAL;
2400 new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi;
2401 if (new_max_size != (uint32_t) new_max_size)
2402 return -EINVAL;
2403
2404 mutex_lock(&info->device->mutex);
2405 if (read_subdevice == NULL ||
2406 (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 ||
2407 read_subdevice->async == NULL) {
2408 mutex_unlock(&info->device->mutex);
2409 return -EINVAL;
2410 }
2411 read_subdevice->async->max_bufsize = new_max_size;
2412 mutex_unlock(&info->device->mutex);
2413
2414 return count;
2415}
2416
2417static struct device_attribute dev_attr_max_read_buffer_kb = {
2418 .attr = {
2419 .name = "max_read_buffer_kb",
2420 .mode = S_IRUGO | S_IWUSR},
2421 .show = &show_max_read_buffer_kb,
2422 .store = &store_max_read_buffer_kb
2423};
2424
2425static ssize_t show_read_buffer_kb(struct device *dev,
2426 struct device_attribute *attr, char *buf)
2427{
2428 ssize_t retval;
2429 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2430 unsigned buffer_size_kb = 0;
2431 struct comedi_subdevice *const read_subdevice =
2432 comedi_get_read_subdevice(info);
2433
2434 mutex_lock(&info->device->mutex);
2435 if (read_subdevice &&
2436 (read_subdevice->subdev_flags & SDF_CMD_READ) &&
2437 read_subdevice->async) {
2438 buffer_size_kb = read_subdevice->async->prealloc_bufsz /
2439 bytes_per_kibi;
2440 }
2441 retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb);
2442 mutex_unlock(&info->device->mutex);
2443
2444 return retval;
2445}
2446
2447static ssize_t store_read_buffer_kb(struct device *dev,
2448 struct device_attribute *attr,
2449 const char *buf, size_t count)
2450{
2451 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2452 unsigned long new_size_kb;
2453 uint64_t new_size;
2454 int retval;
2455 struct comedi_subdevice *const read_subdevice =
2456 comedi_get_read_subdevice(info);
2457
2458 if (strict_strtoul(buf, 10, &new_size_kb))
2459 return -EINVAL;
2460 if (new_size_kb != (uint32_t) new_size_kb)
2461 return -EINVAL;
2462 new_size = ((uint64_t) new_size_kb) * bytes_per_kibi;
2463 if (new_size != (uint32_t) new_size)
2464 return -EINVAL;
2465
2466 mutex_lock(&info->device->mutex);
2467 if (read_subdevice == NULL ||
2468 (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 ||
2469 read_subdevice->async == NULL) {
2470 mutex_unlock(&info->device->mutex);
2471 return -EINVAL;
2472 }
2473 retval = resize_async_buffer(info->device, read_subdevice,
2474 read_subdevice->async, new_size);
2475 mutex_unlock(&info->device->mutex);
2476
2477 if (retval < 0)
2478 return retval;
2479 return count;
2480}
2481
2482static struct device_attribute dev_attr_read_buffer_kb = {
2483 .attr = {
2484 .name = "read_buffer_kb",
2485 .mode = S_IRUGO | S_IWUSR | S_IWGRP},
2486 .show = &show_read_buffer_kb,
2487 .store = &store_read_buffer_kb
2488};
2489
2490static ssize_t show_max_write_buffer_kb(struct device *dev,
2491 struct device_attribute *attr,
2492 char *buf)
2493{
2494 ssize_t retval;
2495 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2496 unsigned max_buffer_size_kb = 0;
2497 struct comedi_subdevice *const write_subdevice =
2498 comedi_get_write_subdevice(info);
2499
2500 mutex_lock(&info->device->mutex);
2501 if (write_subdevice &&
2502 (write_subdevice->subdev_flags & SDF_CMD_WRITE) &&
2503 write_subdevice->async) {
2504 max_buffer_size_kb = write_subdevice->async->max_bufsize /
2505 bytes_per_kibi;
2506 }
2507 retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb);
2508 mutex_unlock(&info->device->mutex);
2509
2510 return retval;
2511}
2512
2513static ssize_t store_max_write_buffer_kb(struct device *dev,
2514 struct device_attribute *attr,
2515 const char *buf, size_t count)
2516{
2517 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2518 unsigned long new_max_size_kb;
2519 uint64_t new_max_size;
2520 struct comedi_subdevice *const write_subdevice =
2521 comedi_get_write_subdevice(info);
2522
2523 if (strict_strtoul(buf, 10, &new_max_size_kb))
2524 return -EINVAL;
2525 if (new_max_size_kb != (uint32_t) new_max_size_kb)
2526 return -EINVAL;
2527 new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi;
2528 if (new_max_size != (uint32_t) new_max_size)
2529 return -EINVAL;
2530
2531 mutex_lock(&info->device->mutex);
2532 if (write_subdevice == NULL ||
2533 (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 ||
2534 write_subdevice->async == NULL) {
2535 mutex_unlock(&info->device->mutex);
2536 return -EINVAL;
2537 }
2538 write_subdevice->async->max_bufsize = new_max_size;
2539 mutex_unlock(&info->device->mutex);
2540
2541 return count;
2542}
2543
2544static struct device_attribute dev_attr_max_write_buffer_kb = {
2545 .attr = {
2546 .name = "max_write_buffer_kb",
2547 .mode = S_IRUGO | S_IWUSR},
2548 .show = &show_max_write_buffer_kb,
2549 .store = &store_max_write_buffer_kb
2550};
2551
2552static ssize_t show_write_buffer_kb(struct device *dev,
2553 struct device_attribute *attr, char *buf)
2554{
2555 ssize_t retval;
2556 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2557 unsigned buffer_size_kb = 0;
2558 struct comedi_subdevice *const write_subdevice =
2559 comedi_get_write_subdevice(info);
2560
2561 mutex_lock(&info->device->mutex);
2562 if (write_subdevice &&
2563 (write_subdevice->subdev_flags & SDF_CMD_WRITE) &&
2564 write_subdevice->async) {
2565 buffer_size_kb = write_subdevice->async->prealloc_bufsz /
2566 bytes_per_kibi;
2567 }
2568 retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb);
2569 mutex_unlock(&info->device->mutex);
2570
2571 return retval;
2572}
2573
2574static ssize_t store_write_buffer_kb(struct device *dev,
2575 struct device_attribute *attr,
2576 const char *buf, size_t count)
2577{
2578 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2579 unsigned long new_size_kb;
2580 uint64_t new_size;
2581 int retval;
2582 struct comedi_subdevice *const write_subdevice =
2583 comedi_get_write_subdevice(info);
2584
2585 if (strict_strtoul(buf, 10, &new_size_kb))
2586 return -EINVAL;
2587 if (new_size_kb != (uint32_t) new_size_kb)
2588 return -EINVAL;
2589 new_size = ((uint64_t) new_size_kb) * bytes_per_kibi;
2590 if (new_size != (uint32_t) new_size)
2591 return -EINVAL;
2592
2593 mutex_lock(&info->device->mutex);
2594 if (write_subdevice == NULL ||
2595 (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 ||
2596 write_subdevice->async == NULL) {
2597 mutex_unlock(&info->device->mutex);
2598 return -EINVAL;
2599 }
2600 retval = resize_async_buffer(info->device, write_subdevice,
2601 write_subdevice->async, new_size);
2602 mutex_unlock(&info->device->mutex);
2603
2604 if (retval < 0)
2605 return retval;
2606 return count;
2607}
2608
2609static struct device_attribute dev_attr_write_buffer_kb = {
2610 .attr = {
2611 .name = "write_buffer_kb",
2612 .mode = S_IRUGO | S_IWUSR | S_IWGRP},
2613 .show = &show_write_buffer_kb,
2614 .store = &store_write_buffer_kb
2615};
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