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Staging: comedi: __user markup on comedi_fops.c
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / staging / comedi / comedi_fops.c
blobe7095d766f406a7a1f982cc7fe763932cecfb5eb
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);
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 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
207 done:
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 */
225 static 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 */
306 static 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
346 copyback:
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 */
367 static 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 */
418 static 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 */
500 static 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 */
565 static 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
612 copyback:
613 if (copy_to_user(arg, &bi, sizeof(struct comedi_bufinfo)))
614 return -EFAULT;
615
616 return 0;
617 }
618
619 static 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
638 static 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
701 error:
702 kfree(insns);
703 kfree(data);
704
705 if (ret < 0)
706 return ret;
707 return i;
708 }
709
710 static 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
773 static 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
915 out:
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 */
933 static 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
956 (data, insn.data, insn.n * sizeof(unsigned int))) {
957 ret = -EFAULT;
958 goto error;
959 }
960 }
961 ret = parse_insn(dev, &insn, data, file);
962 if (ret < 0)
963 goto error;
964 if (insn.insn & INSN_MASK_READ) {
965 if (copy_to_user(insn.data, data, insn.n * sizeof(unsigned int))) {
966 ret = -EFAULT;
967 goto error;
968 }
969 }
970 ret = insn.n;
971
972 error:
973 kfree(data);
974
975 return ret;
976 }
977
978 static void comedi_set_subdevice_runflags(struct comedi_subdevice *s,
979 unsigned mask, unsigned bits)
980 {
981 unsigned long flags;
982
983 spin_lock_irqsave(&s->spin_lock, flags);
984 s->runflags &= ~mask;
985 s->runflags |= (bits & mask);
986 spin_unlock_irqrestore(&s->spin_lock, flags);
987 }
988
989 static int do_cmd_ioctl(struct comedi_device *dev,
990 struct comedi_cmd __user *cmd, void *file)
991 {
992 struct comedi_cmd user_cmd;
993 struct comedi_subdevice *s;
994 struct comedi_async *async;
995 int ret = 0;
996 unsigned int __user *chanlist_saver = NULL;
997
998 if (copy_from_user(&user_cmd, cmd, sizeof(struct comedi_cmd))) {
999 DPRINTK("bad cmd address\n");
1000 return -EFAULT;
1001 }
1002 /* save user's chanlist pointer so it can be restored later */
1003 chanlist_saver = user_cmd.chanlist;
1004
1005 if (user_cmd.subdev >= dev->n_subdevices) {
1006 DPRINTK("%d no such subdevice\n", user_cmd.subdev);
1007 return -ENODEV;
1008 }
1009
1010 s = dev->subdevices + user_cmd.subdev;
1011 async = s->async;
1012
1013 if (s->type == COMEDI_SUBD_UNUSED) {
1014 DPRINTK("%d not valid subdevice\n", user_cmd.subdev);
1015 return -EIO;
1016 }
1017
1018 if (!s->do_cmd || !s->do_cmdtest || !s->async) {
1019 DPRINTK("subdevice %i does not support commands\n",
1020 user_cmd.subdev);
1021 return -EIO;
1022 }
1023
1024 /* are we locked? (ioctl lock) */
1025 if (s->lock && s->lock != file) {
1026 DPRINTK("subdevice locked\n");
1027 return -EACCES;
1028 }
1029
1030 /* are we busy? */
1031 if (s->busy) {
1032 DPRINTK("subdevice busy\n");
1033 return -EBUSY;
1034 }
1035 s->busy = file;
1036
1037 /* make sure channel/gain list isn't too long */
1038 if (user_cmd.chanlist_len > s->len_chanlist) {
1039 DPRINTK("channel/gain list too long %u > %d\n",
1040 user_cmd.chanlist_len, s->len_chanlist);
1041 ret = -EINVAL;
1042 goto cleanup;
1043 }
1044
1045 /* make sure channel/gain list isn't too short */
1046 if (user_cmd.chanlist_len < 1) {
1047 DPRINTK("channel/gain list too short %u < 1\n",
1048 user_cmd.chanlist_len);
1049 ret = -EINVAL;
1050 goto cleanup;
1051 }
1052
1053 kfree(async->cmd.chanlist);
1054 async->cmd = user_cmd;
1055 async->cmd.data = NULL;
1056 /* load channel/gain list */
1057 async->cmd.chanlist =
1058 kmalloc(async->cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1059 if (!async->cmd.chanlist) {
1060 DPRINTK("allocation failed\n");
1061 ret = -ENOMEM;
1062 goto cleanup;
1063 }
1064
1065 if (copy_from_user(async->cmd.chanlist, user_cmd.chanlist,
1066 async->cmd.chanlist_len * sizeof(int))) {
1067 DPRINTK("fault reading chanlist\n");
1068 ret = -EFAULT;
1069 goto cleanup;
1070 }
1071
1072 /* make sure each element in channel/gain list is valid */
1073 ret = comedi_check_chanlist(s, async->cmd.chanlist_len, async->cmd.chanlist);
1074 if (ret < 0) {
1075 DPRINTK("bad chanlist\n");
1076 goto cleanup;
1077 }
1078
1079 ret = s->do_cmdtest(dev, s, &async->cmd);
1080
1081 if (async->cmd.flags & TRIG_BOGUS || ret) {
1082 DPRINTK("test returned %d\n", ret);
1083 user_cmd = async->cmd;
1084 /* restore chanlist pointer before copying back */
1085 user_cmd.chanlist = chanlist_saver;
1086 user_cmd.data = NULL;
1087 if (copy_to_user(cmd, &user_cmd, sizeof(struct comedi_cmd))) {
1088 DPRINTK("fault writing cmd\n");
1089 ret = -EFAULT;
1090 goto cleanup;
1091 }
1092 ret = -EAGAIN;
1093 goto cleanup;
1094 }
1095
1096 if (!async->prealloc_bufsz) {
1097 ret = -ENOMEM;
1098 DPRINTK("no buffer (?)\n");
1099 goto cleanup;
1100 }
1101
1102 comedi_reset_async_buf(async);
1103
1104 async->cb_mask =
1105 COMEDI_CB_EOA | COMEDI_CB_BLOCK | COMEDI_CB_ERROR |
1106 COMEDI_CB_OVERFLOW;
1107 if (async->cmd.flags & TRIG_WAKE_EOS)
1108 async->cb_mask |= COMEDI_CB_EOS;
1109
1110 comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING);
1111
1112 ret = s->do_cmd(dev, s);
1113 if (ret == 0)
1114 return 0;
1115
1116 cleanup:
1117 do_become_nonbusy(dev, s);
1118
1119 return ret;
1120 }
1121
1122 /*
1123 COMEDI_CMDTEST
1124 command testing ioctl
1125
1126 arg:
1127 pointer to cmd structure
1128
1129 reads:
1130 cmd structure at arg
1131 channel/range list
1132
1133 writes:
1134 modified cmd structure at arg
1135
1136 */
1137 static int do_cmdtest_ioctl(struct comedi_device *dev,
1138 struct comedi_cmd __user *arg, void *file)
1139 {
1140 struct comedi_cmd user_cmd;
1141 struct comedi_subdevice *s;
1142 int ret = 0;
1143 unsigned int *chanlist = NULL;
1144 unsigned int __user *chanlist_saver = NULL;
1145
1146 if (copy_from_user(&user_cmd, arg, sizeof(struct comedi_cmd))) {
1147 DPRINTK("bad cmd address\n");
1148 return -EFAULT;
1149 }
1150 /* save user's chanlist pointer so it can be restored later */
1151 chanlist_saver = user_cmd.chanlist;
1152
1153 if (user_cmd.subdev >= dev->n_subdevices) {
1154 DPRINTK("%d no such subdevice\n", user_cmd.subdev);
1155 return -ENODEV;
1156 }
1157
1158 s = dev->subdevices + user_cmd.subdev;
1159 if (s->type == COMEDI_SUBD_UNUSED) {
1160 DPRINTK("%d not valid subdevice\n", user_cmd.subdev);
1161 return -EIO;
1162 }
1163
1164 if (!s->do_cmd || !s->do_cmdtest) {
1165 DPRINTK("subdevice %i does not support commands\n",
1166 user_cmd.subdev);
1167 return -EIO;
1168 }
1169
1170 /* make sure channel/gain list isn't too long */
1171 if (user_cmd.chanlist_len > s->len_chanlist) {
1172 DPRINTK("channel/gain list too long %d > %d\n",
1173 user_cmd.chanlist_len, s->len_chanlist);
1174 ret = -EINVAL;
1175 goto cleanup;
1176 }
1177
1178 /* load channel/gain list */
1179 if (user_cmd.chanlist) {
1180 chanlist =
1181 kmalloc(user_cmd.chanlist_len * sizeof(int), GFP_KERNEL);
1182 if (!chanlist) {
1183 DPRINTK("allocation failed\n");
1184 ret = -ENOMEM;
1185 goto cleanup;
1186 }
1187
1188 if (copy_from_user(chanlist, user_cmd.chanlist,
1189 user_cmd.chanlist_len * sizeof(int))) {
1190 DPRINTK("fault reading chanlist\n");
1191 ret = -EFAULT;
1192 goto cleanup;
1193 }
1194
1195 /* make sure each element in channel/gain list is valid */
1196 ret = comedi_check_chanlist(s, user_cmd.chanlist_len, chanlist);
1197 if (ret < 0) {
1198 DPRINTK("bad chanlist\n");
1199 goto cleanup;
1200 }
1201
1202 user_cmd.chanlist = chanlist;
1203 }
1204
1205 ret = s->do_cmdtest(dev, s, &user_cmd);
1206
1207 /* restore chanlist pointer before copying back */
1208 user_cmd.chanlist = chanlist_saver;
1209
1210 if (copy_to_user(arg, &user_cmd, sizeof(struct comedi_cmd))) {
1211 DPRINTK("bad cmd address\n");
1212 ret = -EFAULT;
1213 goto cleanup;
1214 }
1215 cleanup:
1216 kfree(chanlist);
1217
1218 return ret;
1219 }
1220
1221 /*
1222 COMEDI_LOCK
1223 lock subdevice
1224
1225 arg:
1226 subdevice number
1227
1228 reads:
1229 none
1230
1231 writes:
1232 none
1233
1234 */
1235
1236 static int do_lock_ioctl(struct comedi_device *dev, unsigned int arg,
1237 void *file)
1238 {
1239 int ret = 0;
1240 unsigned long flags;
1241 struct comedi_subdevice *s;
1242
1243 if (arg >= dev->n_subdevices)
1244 return -EINVAL;
1245 s = dev->subdevices + arg;
1246
1247 spin_lock_irqsave(&s->spin_lock, flags);
1248 if (s->busy || s->lock)
1249 ret = -EBUSY;
1250 else
1251 s->lock = file;
1252 spin_unlock_irqrestore(&s->spin_lock, flags);
1253
1254 if (ret < 0)
1255 return ret;
1256
1257 #if 0
1258 if (s->lock_f)
1259 ret = s->lock_f(dev, s);
1260 #endif
1261
1262 return ret;
1263 }
1264
1265 /*
1266 COMEDI_UNLOCK
1267 unlock subdevice
1268
1269 arg:
1270 subdevice number
1271
1272 reads:
1273 none
1274
1275 writes:
1276 none
1277
1278 This function isn't protected by the semaphore, since
1279 we already own the lock.
1280 */
1281 static int do_unlock_ioctl(struct comedi_device *dev, unsigned int arg,
1282 void *file)
1283 {
1284 struct comedi_subdevice *s;
1285
1286 if (arg >= dev->n_subdevices)
1287 return -EINVAL;
1288 s = dev->subdevices + arg;
1289
1290 if (s->busy)
1291 return -EBUSY;
1292
1293 if (s->lock && s->lock != file)
1294 return -EACCES;
1295
1296 if (s->lock == file) {
1297 #if 0
1298 if (s->unlock)
1299 s->unlock(dev, s);
1300 #endif
1301
1302 s->lock = NULL;
1303 }
1304
1305 return 0;
1306 }
1307
1308 /*
1309 COMEDI_CANCEL
1310 cancel acquisition ioctl
1311
1312 arg:
1313 subdevice number
1314
1315 reads:
1316 nothing
1317
1318 writes:
1319 nothing
1320
1321 */
1322 static int do_cancel_ioctl(struct comedi_device *dev, unsigned int arg,
1323 void *file)
1324 {
1325 struct comedi_subdevice *s;
1326
1327 if (arg >= dev->n_subdevices)
1328 return -EINVAL;
1329 s = dev->subdevices + arg;
1330 if (s->async == NULL)
1331 return -EINVAL;
1332
1333 if (s->lock && s->lock != file)
1334 return -EACCES;
1335
1336 if (!s->busy)
1337 return 0;
1338
1339 if (s->busy != file)
1340 return -EBUSY;
1341
1342 return do_cancel(dev, s);
1343 }
1344
1345 /*
1346 COMEDI_POLL ioctl
1347 instructs driver to synchronize buffers
1348
1349 arg:
1350 subdevice number
1351
1352 reads:
1353 nothing
1354
1355 writes:
1356 nothing
1357
1358 */
1359 static int do_poll_ioctl(struct comedi_device *dev, unsigned int arg,
1360 void *file)
1361 {
1362 struct comedi_subdevice *s;
1363
1364 if (arg >= dev->n_subdevices)
1365 return -EINVAL;
1366 s = dev->subdevices + arg;
1367
1368 if (s->lock && s->lock != file)
1369 return -EACCES;
1370
1371 if (!s->busy)
1372 return 0;
1373
1374 if (s->busy != file)
1375 return -EBUSY;
1376
1377 if (s->poll)
1378 return s->poll(dev, s);
1379
1380 return -EINVAL;
1381 }
1382
1383 static int do_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
1384 {
1385 int ret = 0;
1386
1387 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) && s->cancel)
1388 ret = s->cancel(dev, s);
1389
1390 do_become_nonbusy(dev, s);
1391
1392 return ret;
1393 }
1394
1395 static void comedi_unmap(struct vm_area_struct *area)
1396 {
1397 struct comedi_async *async;
1398 struct comedi_device *dev;
1399
1400 async = area->vm_private_data;
1401 dev = async->subdevice->device;
1402
1403 mutex_lock(&dev->mutex);
1404 async->mmap_count--;
1405 mutex_unlock(&dev->mutex);
1406 }
1407
1408 static struct vm_operations_struct comedi_vm_ops = {
1409 .close = comedi_unmap,
1410 };
1411
1412 static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
1413 {
1414 const unsigned minor = iminor(file->f_dentry->d_inode);
1415 struct comedi_device_file_info *dev_file_info =
1416 comedi_get_device_file_info(minor);
1417 struct comedi_device *dev = dev_file_info->device;
1418 struct comedi_async *async = NULL;
1419 unsigned long start = vma->vm_start;
1420 unsigned long size;
1421 int n_pages;
1422 int i;
1423 int retval;
1424 struct comedi_subdevice *s;
1425
1426 mutex_lock(&dev->mutex);
1427 if (!dev->attached) {
1428 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1429 retval = -ENODEV;
1430 goto done;
1431 }
1432 if (vma->vm_flags & VM_WRITE)
1433 s = comedi_get_write_subdevice(dev_file_info);
1434 else
1435 s = comedi_get_read_subdevice(dev_file_info);
1436
1437 if (s == NULL) {
1438 retval = -EINVAL;
1439 goto done;
1440 }
1441 async = s->async;
1442 if (async == NULL) {
1443 retval = -EINVAL;
1444 goto done;
1445 }
1446
1447 if (vma->vm_pgoff != 0) {
1448 DPRINTK("comedi: mmap() offset must be 0.\n");
1449 retval = -EINVAL;
1450 goto done;
1451 }
1452
1453 size = vma->vm_end - vma->vm_start;
1454 if (size > async->prealloc_bufsz) {
1455 retval = -EFAULT;
1456 goto done;
1457 }
1458 if (size & (~PAGE_MASK)) {
1459 retval = -EFAULT;
1460 goto done;
1461 }
1462
1463 n_pages = size >> PAGE_SHIFT;
1464 for (i = 0; i < n_pages; ++i) {
1465 if (remap_pfn_range(vma, start,
1466 page_to_pfn(virt_to_page
1467 (async->buf_page_list
1468 [i].virt_addr)), PAGE_SIZE,
1469 PAGE_SHARED)) {
1470 retval = -EAGAIN;
1471 goto done;
1472 }
1473 start += PAGE_SIZE;
1474 }
1475
1476 vma->vm_ops = &comedi_vm_ops;
1477 vma->vm_private_data = async;
1478
1479 async->mmap_count++;
1480
1481 retval = 0;
1482 done:
1483 mutex_unlock(&dev->mutex);
1484 return retval;
1485 }
1486
1487 static unsigned int comedi_poll(struct file *file, poll_table * wait)
1488 {
1489 unsigned int mask = 0;
1490 const unsigned minor = iminor(file->f_dentry->d_inode);
1491 struct comedi_device_file_info *dev_file_info =
1492 comedi_get_device_file_info(minor);
1493 struct comedi_device *dev = dev_file_info->device;
1494 struct comedi_subdevice *read_subdev;
1495 struct comedi_subdevice *write_subdev;
1496
1497 mutex_lock(&dev->mutex);
1498 if (!dev->attached) {
1499 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1500 mutex_unlock(&dev->mutex);
1501 return 0;
1502 }
1503
1504 mask = 0;
1505 read_subdev = comedi_get_read_subdevice(dev_file_info);
1506 if (read_subdev) {
1507 poll_wait(file, &read_subdev->async->wait_head, wait);
1508 if (!read_subdev->busy
1509 || comedi_buf_read_n_available(read_subdev->async) > 0
1510 || !(comedi_get_subdevice_runflags(read_subdev) &
1511 SRF_RUNNING)) {
1512 mask |= POLLIN | POLLRDNORM;
1513 }
1514 }
1515 write_subdev = comedi_get_write_subdevice(dev_file_info);
1516 if (write_subdev) {
1517 poll_wait(file, &write_subdev->async->wait_head, wait);
1518 comedi_buf_write_alloc(write_subdev->async,
1519 write_subdev->async->prealloc_bufsz);
1520 if (!write_subdev->busy
1521 || !(comedi_get_subdevice_runflags(write_subdev) &
1522 SRF_RUNNING)
1523 || comedi_buf_write_n_allocated(write_subdev->async) >=
1524 bytes_per_sample(write_subdev->async->subdevice)) {
1525 mask |= POLLOUT | POLLWRNORM;
1526 }
1527 }
1528
1529 mutex_unlock(&dev->mutex);
1530 return mask;
1531 }
1532
1533 static ssize_t comedi_write(struct file *file, const char __user *buf,
1534 size_t nbytes, loff_t *offset)
1535 {
1536 struct comedi_subdevice *s;
1537 struct comedi_async *async;
1538 int n, m, count = 0, retval = 0;
1539 DECLARE_WAITQUEUE(wait, current);
1540 const unsigned minor = iminor(file->f_dentry->d_inode);
1541 struct comedi_device_file_info *dev_file_info =
1542 comedi_get_device_file_info(minor);
1543 struct comedi_device *dev = dev_file_info->device;
1544
1545 if (!dev->attached) {
1546 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1547 retval = -ENODEV;
1548 goto done;
1549 }
1550
1551 s = comedi_get_write_subdevice(dev_file_info);
1552 if (s == NULL) {
1553 retval = -EIO;
1554 goto done;
1555 }
1556 async = s->async;
1557
1558 if (!nbytes) {
1559 retval = 0;
1560 goto done;
1561 }
1562 if (!s->busy) {
1563 retval = 0;
1564 goto done;
1565 }
1566 if (s->busy != file) {
1567 retval = -EACCES;
1568 goto done;
1569 }
1570 add_wait_queue(&async->wait_head, &wait);
1571 while (nbytes > 0 && !retval) {
1572 set_current_state(TASK_INTERRUPTIBLE);
1573
1574 n = nbytes;
1575
1576 m = n;
1577 if (async->buf_write_ptr + m > async->prealloc_bufsz)
1578 m = async->prealloc_bufsz - async->buf_write_ptr;
1579 comedi_buf_write_alloc(async, async->prealloc_bufsz);
1580 if (m > comedi_buf_write_n_allocated(async))
1581 m = comedi_buf_write_n_allocated(async);
1582 if (m < n)
1583 n = m;
1584
1585 if (n == 0) {
1586 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1587 if (comedi_get_subdevice_runflags(s) &
1588 SRF_ERROR) {
1589 retval = -EPIPE;
1590 } else {
1591 retval = 0;
1592 }
1593 do_become_nonbusy(dev, s);
1594 break;
1595 }
1596 if (file->f_flags & O_NONBLOCK) {
1597 retval = -EAGAIN;
1598 break;
1599 }
1600 if (signal_pending(current)) {
1601 retval = -ERESTARTSYS;
1602 break;
1603 }
1604 schedule();
1605 if (!s->busy)
1606 break;
1607 if (s->busy != file) {
1608 retval = -EACCES;
1609 break;
1610 }
1611 continue;
1612 }
1613
1614 m = copy_from_user(async->prealloc_buf + async->buf_write_ptr,
1615 buf, n);
1616 if (m) {
1617 n -= m;
1618 retval = -EFAULT;
1619 }
1620 comedi_buf_write_free(async, n);
1621
1622 count += n;
1623 nbytes -= n;
1624
1625 buf += n;
1626 break; /* makes device work like a pipe */
1627 }
1628 set_current_state(TASK_RUNNING);
1629 remove_wait_queue(&async->wait_head, &wait);
1630
1631 done:
1632 return count ? count : retval;
1633 }
1634
1635 static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
1636 loff_t *offset)
1637 {
1638 struct comedi_subdevice *s;
1639 struct comedi_async *async;
1640 int n, m, count = 0, retval = 0;
1641 DECLARE_WAITQUEUE(wait, current);
1642 const unsigned minor = iminor(file->f_dentry->d_inode);
1643 struct comedi_device_file_info *dev_file_info =
1644 comedi_get_device_file_info(minor);
1645 struct comedi_device *dev = dev_file_info->device;
1646
1647 if (!dev->attached) {
1648 DPRINTK("no driver configured on comedi%i\n", dev->minor);
1649 retval = -ENODEV;
1650 goto done;
1651 }
1652
1653 s = comedi_get_read_subdevice(dev_file_info);
1654 if (s == NULL) {
1655 retval = -EIO;
1656 goto done;
1657 }
1658 async = s->async;
1659 if (!nbytes) {
1660 retval = 0;
1661 goto done;
1662 }
1663 if (!s->busy) {
1664 retval = 0;
1665 goto done;
1666 }
1667 if (s->busy != file) {
1668 retval = -EACCES;
1669 goto done;
1670 }
1671
1672 add_wait_queue(&async->wait_head, &wait);
1673 while (nbytes > 0 && !retval) {
1674 set_current_state(TASK_INTERRUPTIBLE);
1675
1676 n = nbytes;
1677
1678 m = comedi_buf_read_n_available(async);
1679 /* printk("%d available\n",m); */
1680 if (async->buf_read_ptr + m > async->prealloc_bufsz)
1681 m = async->prealloc_bufsz - async->buf_read_ptr;
1682 /* printk("%d contiguous\n",m); */
1683 if (m < n)
1684 n = m;
1685
1686 if (n == 0) {
1687 if (!(comedi_get_subdevice_runflags(s) & SRF_RUNNING)) {
1688 do_become_nonbusy(dev, s);
1689 if (comedi_get_subdevice_runflags(s) &
1690 SRF_ERROR) {
1691 retval = -EPIPE;
1692 } else {
1693 retval = 0;
1694 }
1695 break;
1696 }
1697 if (file->f_flags & O_NONBLOCK) {
1698 retval = -EAGAIN;
1699 break;
1700 }
1701 if (signal_pending(current)) {
1702 retval = -ERESTARTSYS;
1703 break;
1704 }
1705 schedule();
1706 if (!s->busy) {
1707 retval = 0;
1708 break;
1709 }
1710 if (s->busy != file) {
1711 retval = -EACCES;
1712 break;
1713 }
1714 continue;
1715 }
1716 m = copy_to_user(buf, async->prealloc_buf +
1717 async->buf_read_ptr, n);
1718 if (m) {
1719 n -= m;
1720 retval = -EFAULT;
1721 }
1722
1723 comedi_buf_read_alloc(async, n);
1724 comedi_buf_read_free(async, n);
1725
1726 count += n;
1727 nbytes -= n;
1728
1729 buf += n;
1730 break; /* makes device work like a pipe */
1731 }
1732 if (!(comedi_get_subdevice_runflags(s) & (SRF_ERROR | SRF_RUNNING)) &&
1733 async->buf_read_count - async->buf_write_count == 0) {
1734 do_become_nonbusy(dev, s);
1735 }
1736 set_current_state(TASK_RUNNING);
1737 remove_wait_queue(&async->wait_head, &wait);
1738
1739 done:
1740 return count ? count : retval;
1741 }
1742
1743 /*
1744 This function restores a subdevice to an idle state.
1745 */
1746 void do_become_nonbusy(struct comedi_device *dev, struct comedi_subdevice *s)
1747 {
1748 struct comedi_async *async = s->async;
1749
1750 comedi_set_subdevice_runflags(s, SRF_RUNNING, 0);
1751 if (async) {
1752 comedi_reset_async_buf(async);
1753 async->inttrig = NULL;
1754 } else {
1755 printk(KERN_ERR
1756 "BUG: (?) do_become_nonbusy called with async=0\n");
1757 }
1758
1759 s->busy = NULL;
1760 }
1761
1762 static int comedi_open(struct inode *inode, struct file *file)
1763 {
1764 const unsigned minor = iminor(inode);
1765 struct comedi_device_file_info *dev_file_info =
1766 comedi_get_device_file_info(minor);
1767 struct comedi_device *dev =
1768 dev_file_info ? dev_file_info->device : NULL;
1769
1770 if (dev == NULL) {
1771 DPRINTK("invalid minor number\n");
1772 return -ENODEV;
1773 }
1774
1775 /* This is slightly hacky, but we want module autoloading
1776 * to work for root.
1777 * case: user opens device, attached -> ok
1778 * case: user opens device, unattached, in_request_module=0 -> autoload
1779 * case: user opens device, unattached, in_request_module=1 -> fail
1780 * case: root opens device, attached -> ok
1781 * case: root opens device, unattached, in_request_module=1 -> ok
1782 * (typically called from modprobe)
1783 * case: root opens device, unattached, in_request_module=0 -> autoload
1784 *
1785 * The last could be changed to "-> ok", which would deny root
1786 * autoloading.
1787 */
1788 mutex_lock(&dev->mutex);
1789 if (dev->attached)
1790 goto ok;
1791 if (!capable(CAP_NET_ADMIN) && dev->in_request_module) {
1792 DPRINTK("in request module\n");
1793 mutex_unlock(&dev->mutex);
1794 return -ENODEV;
1795 }
1796 if (capable(CAP_NET_ADMIN) && dev->in_request_module)
1797 goto ok;
1798
1799 dev->in_request_module = 1;
1800
1801 #ifdef CONFIG_KMOD
1802 mutex_unlock(&dev->mutex);
1803 request_module("char-major-%i-%i", COMEDI_MAJOR, dev->minor);
1804 mutex_lock(&dev->mutex);
1805 #endif
1806
1807 dev->in_request_module = 0;
1808
1809 if (!dev->attached && !capable(CAP_NET_ADMIN)) {
1810 DPRINTK("not attached and not CAP_NET_ADMIN\n");
1811 mutex_unlock(&dev->mutex);
1812 return -ENODEV;
1813 }
1814 ok:
1815 __module_get(THIS_MODULE);
1816
1817 if (dev->attached) {
1818 if (!try_module_get(dev->driver->module)) {
1819 module_put(THIS_MODULE);
1820 mutex_unlock(&dev->mutex);
1821 return -ENOSYS;
1822 }
1823 }
1824
1825 if (dev->attached && dev->use_count == 0 && dev->open)
1826 dev->open(dev);
1827
1828 dev->use_count++;
1829
1830 mutex_unlock(&dev->mutex);
1831
1832 return 0;
1833 }
1834
1835 static int comedi_close(struct inode *inode, struct file *file)
1836 {
1837 const unsigned minor = iminor(inode);
1838 struct comedi_device_file_info *dev_file_info =
1839 comedi_get_device_file_info(minor);
1840 struct comedi_device *dev = dev_file_info->device;
1841 struct comedi_subdevice *s = NULL;
1842 int i;
1843
1844 mutex_lock(&dev->mutex);
1845
1846 if (dev->subdevices) {
1847 for (i = 0; i < dev->n_subdevices; i++) {
1848 s = dev->subdevices + i;
1849
1850 if (s->busy == file)
1851 do_cancel(dev, s);
1852 if (s->lock == file)
1853 s->lock = NULL;
1854 }
1855 }
1856 if (dev->attached && dev->use_count == 1 && dev->close)
1857 dev->close(dev);
1858
1859 module_put(THIS_MODULE);
1860 if (dev->attached)
1861 module_put(dev->driver->module);
1862
1863 dev->use_count--;
1864
1865 mutex_unlock(&dev->mutex);
1866
1867 if (file->f_flags & FASYNC)
1868 comedi_fasync(-1, file, 0);
1869
1870 return 0;
1871 }
1872
1873 static int comedi_fasync(int fd, struct file *file, int on)
1874 {
1875 const unsigned minor = iminor(file->f_dentry->d_inode);
1876 struct comedi_device_file_info *dev_file_info =
1877 comedi_get_device_file_info(minor);
1878
1879 struct comedi_device *dev = dev_file_info->device;
1880
1881 return fasync_helper(fd, file, on, &dev->async_queue);
1882 }
1883
1884 const struct file_operations comedi_fops = {
1885 .owner = THIS_MODULE,
1886 .unlocked_ioctl = comedi_unlocked_ioctl,
1887 .compat_ioctl = comedi_compat_ioctl,
1888 .open = comedi_open,
1889 .release = comedi_close,
1890 .read = comedi_read,
1891 .write = comedi_write,
1892 .mmap = comedi_mmap,
1893 .poll = comedi_poll,
1894 .fasync = comedi_fasync,
1895 };
1896
1897 struct class *comedi_class;
1898 static struct cdev comedi_cdev;
1899
1900 static void comedi_cleanup_legacy_minors(void)
1901 {
1902 unsigned i;
1903
1904 for (i = 0; i < comedi_num_legacy_minors; i++)
1905 comedi_free_board_minor(i);
1906 }
1907
1908 static int __init comedi_init(void)
1909 {
1910 int i;
1911 int retval;
1912
1913 printk(KERN_INFO "comedi: version " COMEDI_RELEASE
1914 " - http://www.comedi.org\n");
1915
1916 if (comedi_num_legacy_minors < 0 ||
1917 comedi_num_legacy_minors > COMEDI_NUM_BOARD_MINORS) {
1918 printk(KERN_ERR "comedi: error: invalid value for module "
1919 "parameter \"comedi_num_legacy_minors\". Valid values "
1920 "are 0 through %i.\n", COMEDI_NUM_BOARD_MINORS);
1921 return -EINVAL;
1922 }
1923
1924 /*
1925 * comedi is unusable if both comedi_autoconfig and
1926 * comedi_num_legacy_minors are zero, so we might as well adjust the
1927 * defaults in that case
1928 */
1929 if (comedi_autoconfig == 0 && comedi_num_legacy_minors == 0)
1930 comedi_num_legacy_minors = 16;
1931
1932 memset(comedi_file_info_table, 0,
1933 sizeof(struct comedi_device_file_info *) * COMEDI_NUM_MINORS);
1934
1935 retval = register_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
1936 COMEDI_NUM_MINORS, "comedi");
1937 if (retval)
1938 return -EIO;
1939 cdev_init(&comedi_cdev, &comedi_fops);
1940 comedi_cdev.owner = THIS_MODULE;
1941 kobject_set_name(&comedi_cdev.kobj, "comedi");
1942 if (cdev_add(&comedi_cdev, MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS)) {
1943 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
1944 COMEDI_NUM_MINORS);
1945 return -EIO;
1946 }
1947 comedi_class = class_create(THIS_MODULE, "comedi");
1948 if (IS_ERR(comedi_class)) {
1949 printk(KERN_ERR "comedi: failed to create class");
1950 cdev_del(&comedi_cdev);
1951 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
1952 COMEDI_NUM_MINORS);
1953 return PTR_ERR(comedi_class);
1954 }
1955
1956 /* XXX requires /proc interface */
1957 comedi_proc_init();
1958
1959 /* create devices files for legacy/manual use */
1960 for (i = 0; i < comedi_num_legacy_minors; i++) {
1961 int minor;
1962 minor = comedi_alloc_board_minor(NULL);
1963 if (minor < 0) {
1964 comedi_cleanup_legacy_minors();
1965 cdev_del(&comedi_cdev);
1966 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0),
1967 COMEDI_NUM_MINORS);
1968 return minor;
1969 }
1970 }
1971
1972 return 0;
1973 }
1974
1975 static void __exit comedi_cleanup(void)
1976 {
1977 int i;
1978
1979 comedi_cleanup_legacy_minors();
1980 for (i = 0; i < COMEDI_NUM_MINORS; ++i)
1981 BUG_ON(comedi_file_info_table[i]);
1982
1983 class_destroy(comedi_class);
1984 cdev_del(&comedi_cdev);
1985 unregister_chrdev_region(MKDEV(COMEDI_MAJOR, 0), COMEDI_NUM_MINORS);
1986
1987 comedi_proc_cleanup();
1988 }
1989
1990 module_init(comedi_init);
1991 module_exit(comedi_cleanup);
1992
1993 void comedi_error(const struct comedi_device *dev, const char *s)
1994 {
1995 printk(KERN_ERR "comedi%d: %s: %s\n", dev->minor,
1996 dev->driver->driver_name, s);
1997 }
1998 EXPORT_SYMBOL(comedi_error);
1999
2000 void comedi_event(struct comedi_device *dev, struct comedi_subdevice *s)
2001 {
2002 struct comedi_async *async = s->async;
2003 unsigned runflags = 0;
2004 unsigned runflags_mask = 0;
2005
2006 /* DPRINTK("comedi_event 0x%x\n",mask); */
2007
2008 if ((comedi_get_subdevice_runflags(s) & SRF_RUNNING) == 0)
2009 return;
2010
2011 if (s->
2012 async->events & (COMEDI_CB_EOA | COMEDI_CB_ERROR |
2013 COMEDI_CB_OVERFLOW)) {
2014 runflags_mask |= SRF_RUNNING;
2015 }
2016 /* remember if an error event has occured, so an error
2017 * can be returned the next time the user does a read() */
2018 if (s->async->events & (COMEDI_CB_ERROR | COMEDI_CB_OVERFLOW)) {
2019 runflags_mask |= SRF_ERROR;
2020 runflags |= SRF_ERROR;
2021 }
2022 if (runflags_mask) {
2023 /*sets SRF_ERROR and SRF_RUNNING together atomically */
2024 comedi_set_subdevice_runflags(s, runflags_mask, runflags);
2025 }
2026
2027 if (async->cb_mask & s->async->events) {
2028 if (comedi_get_subdevice_runflags(s) & SRF_USER) {
2029 wake_up_interruptible(&async->wait_head);
2030 if (s->subdev_flags & SDF_CMD_READ)
2031 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
2032 if (s->subdev_flags & SDF_CMD_WRITE)
2033 kill_fasync(&dev->async_queue, SIGIO, POLL_OUT);
2034 } else {
2035 if (async->cb_func)
2036 async->cb_func(s->async->events, async->cb_arg);
2037 }
2038 }
2039 s->async->events = 0;
2040 }
2041 EXPORT_SYMBOL(comedi_event);
2042
2043 unsigned comedi_get_subdevice_runflags(struct comedi_subdevice *s)
2044 {
2045 unsigned long flags;
2046 unsigned runflags;
2047
2048 spin_lock_irqsave(&s->spin_lock, flags);
2049 runflags = s->runflags;
2050 spin_unlock_irqrestore(&s->spin_lock, flags);
2051 return runflags;
2052 }
2053 EXPORT_SYMBOL(comedi_get_subdevice_runflags);
2054
2055 static int is_device_busy(struct comedi_device *dev)
2056 {
2057 struct comedi_subdevice *s;
2058 int i;
2059
2060 if (!dev->attached)
2061 return 0;
2062
2063 for (i = 0; i < dev->n_subdevices; i++) {
2064 s = dev->subdevices + i;
2065 if (s->busy)
2066 return 1;
2067 if (s->async && s->async->mmap_count)
2068 return 1;
2069 }
2070
2071 return 0;
2072 }
2073
2074 static void comedi_device_init(struct comedi_device *dev)
2075 {
2076 memset(dev, 0, sizeof(struct comedi_device));
2077 spin_lock_init(&dev->spinlock);
2078 mutex_init(&dev->mutex);
2079 dev->minor = -1;
2080 }
2081
2082 static void comedi_device_cleanup(struct comedi_device *dev)
2083 {
2084 if (dev == NULL)
2085 return;
2086 mutex_lock(&dev->mutex);
2087 comedi_device_detach(dev);
2088 mutex_unlock(&dev->mutex);
2089 mutex_destroy(&dev->mutex);
2090 }
2091
2092 int comedi_alloc_board_minor(struct device *hardware_device)
2093 {
2094 unsigned long flags;
2095 struct comedi_device_file_info *info;
2096 struct device *csdev;
2097 unsigned i;
2098 int retval;
2099
2100 info = kzalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
2101 if (info == NULL)
2102 return -ENOMEM;
2103 info->device = kzalloc(sizeof(struct comedi_device), GFP_KERNEL);
2104 if (info->device == NULL) {
2105 kfree(info);
2106 return -ENOMEM;
2107 }
2108 comedi_device_init(info->device);
2109 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2110 for (i = 0; i < COMEDI_NUM_BOARD_MINORS; ++i) {
2111 if (comedi_file_info_table[i] == NULL) {
2112 comedi_file_info_table[i] = info;
2113 break;
2114 }
2115 }
2116 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2117 if (i == COMEDI_NUM_BOARD_MINORS) {
2118 comedi_device_cleanup(info->device);
2119 kfree(info->device);
2120 kfree(info);
2121 printk(KERN_ERR
2122
2123 "comedi: error: ran out of minor numbers for board device files.\n");
2124 return -EBUSY;
2125 }
2126 info->device->minor = i;
2127 csdev = COMEDI_DEVICE_CREATE(comedi_class, NULL,
2128 MKDEV(COMEDI_MAJOR, i), NULL,
2129 hardware_device, "comedi%i", i);
2130 if (!IS_ERR(csdev))
2131 info->device->class_dev = csdev;
2132 dev_set_drvdata(csdev, info);
2133 retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb);
2134 if (retval) {
2135 printk(KERN_ERR
2136 "comedi: failed to create sysfs attribute file \"%s\".\n",
2137 dev_attr_max_read_buffer_kb.attr.name);
2138 comedi_free_board_minor(i);
2139 return retval;
2140 }
2141 retval = device_create_file(csdev, &dev_attr_read_buffer_kb);
2142 if (retval) {
2143 printk(KERN_ERR
2144 "comedi: failed to create sysfs attribute file \"%s\".\n",
2145 dev_attr_read_buffer_kb.attr.name);
2146 comedi_free_board_minor(i);
2147 return retval;
2148 }
2149 retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb);
2150 if (retval) {
2151 printk(KERN_ERR
2152 "comedi: failed to create sysfs attribute file \"%s\".\n",
2153 dev_attr_max_write_buffer_kb.attr.name);
2154 comedi_free_board_minor(i);
2155 return retval;
2156 }
2157 retval = device_create_file(csdev, &dev_attr_write_buffer_kb);
2158 if (retval) {
2159 printk(KERN_ERR
2160 "comedi: failed to create sysfs attribute file \"%s\".\n",
2161 dev_attr_write_buffer_kb.attr.name);
2162 comedi_free_board_minor(i);
2163 return retval;
2164 }
2165 return i;
2166 }
2167
2168 void comedi_free_board_minor(unsigned minor)
2169 {
2170 unsigned long flags;
2171 struct comedi_device_file_info *info;
2172
2173 BUG_ON(minor >= COMEDI_NUM_BOARD_MINORS);
2174 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2175 info = comedi_file_info_table[minor];
2176 comedi_file_info_table[minor] = NULL;
2177 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2178
2179 if (info) {
2180 struct comedi_device *dev = info->device;
2181 if (dev) {
2182 if (dev->class_dev) {
2183 device_destroy(comedi_class,
2184 MKDEV(COMEDI_MAJOR, dev->minor));
2185 }
2186 comedi_device_cleanup(dev);
2187 kfree(dev);
2188 }
2189 kfree(info);
2190 }
2191 }
2192
2193 int comedi_alloc_subdevice_minor(struct comedi_device *dev,
2194 struct comedi_subdevice *s)
2195 {
2196 unsigned long flags;
2197 struct comedi_device_file_info *info;
2198 struct device *csdev;
2199 unsigned i;
2200 int retval;
2201
2202 info = kmalloc(sizeof(struct comedi_device_file_info), GFP_KERNEL);
2203 if (info == NULL)
2204 return -ENOMEM;
2205 info->device = dev;
2206 info->read_subdevice = s;
2207 info->write_subdevice = s;
2208 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2209 for (i = COMEDI_FIRST_SUBDEVICE_MINOR; i < COMEDI_NUM_MINORS; ++i) {
2210 if (comedi_file_info_table[i] == NULL) {
2211 comedi_file_info_table[i] = info;
2212 break;
2213 }
2214 }
2215 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2216 if (i == COMEDI_NUM_MINORS) {
2217 kfree(info);
2218 printk(KERN_ERR
2219 "comedi: error: ran out of minor numbers for board device files.\n");
2220 return -EBUSY;
2221 }
2222 s->minor = i;
2223 csdev = COMEDI_DEVICE_CREATE(comedi_class, dev->class_dev,
2224 MKDEV(COMEDI_MAJOR, i), NULL, NULL,
2225 "comedi%i_subd%i", dev->minor,
2226 (int)(s - dev->subdevices));
2227 if (!IS_ERR(csdev))
2228 s->class_dev = csdev;
2229 dev_set_drvdata(csdev, info);
2230 retval = device_create_file(csdev, &dev_attr_max_read_buffer_kb);
2231 if (retval) {
2232 printk(KERN_ERR
2233 "comedi: failed to create sysfs attribute file \"%s\".\n",
2234 dev_attr_max_read_buffer_kb.attr.name);
2235 comedi_free_subdevice_minor(s);
2236 return retval;
2237 }
2238 retval = device_create_file(csdev, &dev_attr_read_buffer_kb);
2239 if (retval) {
2240 printk(KERN_ERR
2241 "comedi: failed to create sysfs attribute file \"%s\".\n",
2242 dev_attr_read_buffer_kb.attr.name);
2243 comedi_free_subdevice_minor(s);
2244 return retval;
2245 }
2246 retval = device_create_file(csdev, &dev_attr_max_write_buffer_kb);
2247 if (retval) {
2248 printk(KERN_ERR
2249 "comedi: failed to create sysfs attribute file \"%s\".\n",
2250 dev_attr_max_write_buffer_kb.attr.name);
2251 comedi_free_subdevice_minor(s);
2252 return retval;
2253 }
2254 retval = device_create_file(csdev, &dev_attr_write_buffer_kb);
2255 if (retval) {
2256 printk(KERN_ERR
2257 "comedi: failed to create sysfs attribute file \"%s\".\n",
2258 dev_attr_write_buffer_kb.attr.name);
2259 comedi_free_subdevice_minor(s);
2260 return retval;
2261 }
2262 return i;
2263 }
2264
2265 void comedi_free_subdevice_minor(struct comedi_subdevice *s)
2266 {
2267 unsigned long flags;
2268 struct comedi_device_file_info *info;
2269
2270 if (s == NULL)
2271 return;
2272 if (s->minor < 0)
2273 return;
2274
2275 BUG_ON(s->minor >= COMEDI_NUM_MINORS);
2276 BUG_ON(s->minor < COMEDI_FIRST_SUBDEVICE_MINOR);
2277
2278 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2279 info = comedi_file_info_table[s->minor];
2280 comedi_file_info_table[s->minor] = NULL;
2281 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2282
2283 if (s->class_dev) {
2284 device_destroy(comedi_class, MKDEV(COMEDI_MAJOR, s->minor));
2285 s->class_dev = NULL;
2286 }
2287 kfree(info);
2288 }
2289
2290 struct comedi_device_file_info *comedi_get_device_file_info(unsigned minor)
2291 {
2292 unsigned long flags;
2293 struct comedi_device_file_info *info;
2294
2295 BUG_ON(minor >= COMEDI_NUM_MINORS);
2296 spin_lock_irqsave(&comedi_file_info_table_lock, flags);
2297 info = comedi_file_info_table[minor];
2298 spin_unlock_irqrestore(&comedi_file_info_table_lock, flags);
2299 return info;
2300 }
2301 EXPORT_SYMBOL_GPL(comedi_get_device_file_info);
2302
2303 static int resize_async_buffer(struct comedi_device *dev,
2304 struct comedi_subdevice *s,
2305 struct comedi_async *async, unsigned new_size)
2306 {
2307 int retval;
2308
2309 if (new_size > async->max_bufsize)
2310 return -EPERM;
2311
2312 if (s->busy) {
2313 DPRINTK("subdevice is busy, cannot resize buffer\n");
2314 return -EBUSY;
2315 }
2316 if (async->mmap_count) {
2317 DPRINTK("subdevice is mmapped, cannot resize buffer\n");
2318 return -EBUSY;
2319 }
2320
2321 if (!async->prealloc_buf)
2322 return -EINVAL;
2323
2324 /* make sure buffer is an integral number of pages
2325 * (we round up) */
2326 new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;
2327
2328 retval = comedi_buf_alloc(dev, s, new_size);
2329 if (retval < 0)
2330 return retval;
2331
2332 if (s->buf_change) {
2333 retval = s->buf_change(dev, s, new_size);
2334 if (retval < 0)
2335 return retval;
2336 }
2337
2338 DPRINTK("comedi%i subd %d buffer resized to %i bytes\n",
2339 dev->minor, (int)(s - dev->subdevices), async->prealloc_bufsz);
2340 return 0;
2341 }
2342
2343 /* sysfs attribute files */
2344
2345 static const unsigned bytes_per_kibi = 1024;
2346
2347 static ssize_t show_max_read_buffer_kb(struct device *dev,
2348 struct device_attribute *attr, char *buf)
2349 {
2350 ssize_t retval;
2351 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2352 unsigned max_buffer_size_kb = 0;
2353 struct comedi_subdevice *const read_subdevice =
2354 comedi_get_read_subdevice(info);
2355
2356 mutex_lock(&info->device->mutex);
2357 if (read_subdevice &&
2358 (read_subdevice->subdev_flags & SDF_CMD_READ) &&
2359 read_subdevice->async) {
2360 max_buffer_size_kb = read_subdevice->async->max_bufsize /
2361 bytes_per_kibi;
2362 }
2363 retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb);
2364 mutex_unlock(&info->device->mutex);
2365
2366 return retval;
2367 }
2368
2369 static ssize_t store_max_read_buffer_kb(struct device *dev,
2370 struct device_attribute *attr,
2371 const char *buf, size_t count)
2372 {
2373 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2374 unsigned long new_max_size_kb;
2375 uint64_t new_max_size;
2376 struct comedi_subdevice *const read_subdevice =
2377 comedi_get_read_subdevice(info);
2378
2379 if (strict_strtoul(buf, 10, &new_max_size_kb))
2380 return -EINVAL;
2381 if (new_max_size_kb != (uint32_t) new_max_size_kb)
2382 return -EINVAL;
2383 new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi;
2384 if (new_max_size != (uint32_t) new_max_size)
2385 return -EINVAL;
2386
2387 mutex_lock(&info->device->mutex);
2388 if (read_subdevice == NULL ||
2389 (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 ||
2390 read_subdevice->async == NULL) {
2391 mutex_unlock(&info->device->mutex);
2392 return -EINVAL;
2393 }
2394 read_subdevice->async->max_bufsize = new_max_size;
2395 mutex_unlock(&info->device->mutex);
2396
2397 return count;
2398 }
2399
2400 static struct device_attribute dev_attr_max_read_buffer_kb = {
2401 .attr = {
2402 .name = "max_read_buffer_kb",
2403 .mode = S_IRUGO | S_IWUSR},
2404 .show = &show_max_read_buffer_kb,
2405 .store = &store_max_read_buffer_kb
2406 };
2407
2408 static ssize_t show_read_buffer_kb(struct device *dev,
2409 struct device_attribute *attr, char *buf)
2410 {
2411 ssize_t retval;
2412 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2413 unsigned buffer_size_kb = 0;
2414 struct comedi_subdevice *const read_subdevice =
2415 comedi_get_read_subdevice(info);
2416
2417 mutex_lock(&info->device->mutex);
2418 if (read_subdevice &&
2419 (read_subdevice->subdev_flags & SDF_CMD_READ) &&
2420 read_subdevice->async) {
2421 buffer_size_kb = read_subdevice->async->prealloc_bufsz /
2422 bytes_per_kibi;
2423 }
2424 retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb);
2425 mutex_unlock(&info->device->mutex);
2426
2427 return retval;
2428 }
2429
2430 static ssize_t store_read_buffer_kb(struct device *dev,
2431 struct device_attribute *attr,
2432 const char *buf, size_t count)
2433 {
2434 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2435 unsigned long new_size_kb;
2436 uint64_t new_size;
2437 int retval;
2438 struct comedi_subdevice *const read_subdevice =
2439 comedi_get_read_subdevice(info);
2440
2441 if (strict_strtoul(buf, 10, &new_size_kb))
2442 return -EINVAL;
2443 if (new_size_kb != (uint32_t) new_size_kb)
2444 return -EINVAL;
2445 new_size = ((uint64_t) new_size_kb) * bytes_per_kibi;
2446 if (new_size != (uint32_t) new_size)
2447 return -EINVAL;
2448
2449 mutex_lock(&info->device->mutex);
2450 if (read_subdevice == NULL ||
2451 (read_subdevice->subdev_flags & SDF_CMD_READ) == 0 ||
2452 read_subdevice->async == NULL) {
2453 mutex_unlock(&info->device->mutex);
2454 return -EINVAL;
2455 }
2456 retval = resize_async_buffer(info->device, read_subdevice,
2457 read_subdevice->async, new_size);
2458 mutex_unlock(&info->device->mutex);
2459
2460 if (retval < 0)
2461 return retval;
2462 return count;
2463 }
2464
2465 static struct device_attribute dev_attr_read_buffer_kb = {
2466 .attr = {
2467 .name = "read_buffer_kb",
2468 .mode = S_IRUGO | S_IWUSR | S_IWGRP},
2469 .show = &show_read_buffer_kb,
2470 .store = &store_read_buffer_kb
2471 };
2472
2473 static ssize_t show_max_write_buffer_kb(struct device *dev,
2474 struct device_attribute *attr,
2475 char *buf)
2476 {
2477 ssize_t retval;
2478 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2479 unsigned max_buffer_size_kb = 0;
2480 struct comedi_subdevice *const write_subdevice =
2481 comedi_get_write_subdevice(info);
2482
2483 mutex_lock(&info->device->mutex);
2484 if (write_subdevice &&
2485 (write_subdevice->subdev_flags & SDF_CMD_WRITE) &&
2486 write_subdevice->async) {
2487 max_buffer_size_kb = write_subdevice->async->max_bufsize /
2488 bytes_per_kibi;
2489 }
2490 retval = snprintf(buf, PAGE_SIZE, "%i\n", max_buffer_size_kb);
2491 mutex_unlock(&info->device->mutex);
2492
2493 return retval;
2494 }
2495
2496 static ssize_t store_max_write_buffer_kb(struct device *dev,
2497 struct device_attribute *attr,
2498 const char *buf, size_t count)
2499 {
2500 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2501 unsigned long new_max_size_kb;
2502 uint64_t new_max_size;
2503 struct comedi_subdevice *const write_subdevice =
2504 comedi_get_write_subdevice(info);
2505
2506 if (strict_strtoul(buf, 10, &new_max_size_kb))
2507 return -EINVAL;
2508 if (new_max_size_kb != (uint32_t) new_max_size_kb)
2509 return -EINVAL;
2510 new_max_size = ((uint64_t) new_max_size_kb) * bytes_per_kibi;
2511 if (new_max_size != (uint32_t) new_max_size)
2512 return -EINVAL;
2513
2514 mutex_lock(&info->device->mutex);
2515 if (write_subdevice == NULL ||
2516 (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 ||
2517 write_subdevice->async == NULL) {
2518 mutex_unlock(&info->device->mutex);
2519 return -EINVAL;
2520 }
2521 write_subdevice->async->max_bufsize = new_max_size;
2522 mutex_unlock(&info->device->mutex);
2523
2524 return count;
2525 }
2526
2527 static struct device_attribute dev_attr_max_write_buffer_kb = {
2528 .attr = {
2529 .name = "max_write_buffer_kb",
2530 .mode = S_IRUGO | S_IWUSR},
2531 .show = &show_max_write_buffer_kb,
2532 .store = &store_max_write_buffer_kb
2533 };
2534
2535 static ssize_t show_write_buffer_kb(struct device *dev,
2536 struct device_attribute *attr, char *buf)
2537 {
2538 ssize_t retval;
2539 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2540 unsigned buffer_size_kb = 0;
2541 struct comedi_subdevice *const write_subdevice =
2542 comedi_get_write_subdevice(info);
2543
2544 mutex_lock(&info->device->mutex);
2545 if (write_subdevice &&
2546 (write_subdevice->subdev_flags & SDF_CMD_WRITE) &&
2547 write_subdevice->async) {
2548 buffer_size_kb = write_subdevice->async->prealloc_bufsz /
2549 bytes_per_kibi;
2550 }
2551 retval = snprintf(buf, PAGE_SIZE, "%i\n", buffer_size_kb);
2552 mutex_unlock(&info->device->mutex);
2553
2554 return retval;
2555 }
2556
2557 static ssize_t store_write_buffer_kb(struct device *dev,
2558 struct device_attribute *attr,
2559 const char *buf, size_t count)
2560 {
2561 struct comedi_device_file_info *info = dev_get_drvdata(dev);
2562 unsigned long new_size_kb;
2563 uint64_t new_size;
2564 int retval;
2565 struct comedi_subdevice *const write_subdevice =
2566 comedi_get_write_subdevice(info);
2567
2568 if (strict_strtoul(buf, 10, &new_size_kb))
2569 return -EINVAL;
2570 if (new_size_kb != (uint32_t) new_size_kb)
2571 return -EINVAL;
2572 new_size = ((uint64_t) new_size_kb) * bytes_per_kibi;
2573 if (new_size != (uint32_t) new_size)
2574 return -EINVAL;
2575
2576 mutex_lock(&info->device->mutex);
2577 if (write_subdevice == NULL ||
2578 (write_subdevice->subdev_flags & SDF_CMD_WRITE) == 0 ||
2579 write_subdevice->async == NULL) {
2580 mutex_unlock(&info->device->mutex);
2581 return -EINVAL;
2582 }
2583 retval = resize_async_buffer(info->device, write_subdevice,
2584 write_subdevice->async, new_size);
2585 mutex_unlock(&info->device->mutex);
2586
2587 if (retval < 0)
2588 return retval;
2589 return count;
2590 }
2591
2592 static struct device_attribute dev_attr_write_buffer_kb = {
2593 .attr = {
2594 .name = "write_buffer_kb",
2595 .mode = S_IRUGO | S_IWUSR | S_IWGRP},
2596 .show = &show_write_buffer_kb,
2597 .store = &store_write_buffer_kb
2598 };
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree