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7
8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10#include <linux/module.h>
11#include <linux/mutex.h>
12#include <linux/device.h>
13#include <linux/file.h>
14#include <linux/idr.h>
15#include <linux/poll.h>
16#include <linux/sched.h>
17#include <linux/wait.h>
18
19#include "rc-core-priv.h"
20#include <uapi/linux/lirc.h>
21
22#define LIRCBUF_SIZE 1024
23
24static dev_t lirc_base_dev;
25
26
27static DEFINE_IDA(lirc_ida);
28
29
30static struct class *lirc_class;
31
32
33
34
35
36
37
38void lirc_raw_event(struct rc_dev *dev, struct ir_raw_event ev)
39{
40 unsigned long flags;
41 struct lirc_fh *fh;
42 int sample;
43
44
45 if (ev.reset) {
46
47
48
49
50
51
52
53 sample = LIRC_SPACE(LIRC_VALUE_MASK);
54 dev_dbg(&dev->dev, "delivering reset sync space to lirc_dev\n");
55
56
57 } else if (ev.carrier_report) {
58 sample = LIRC_FREQUENCY(ev.carrier);
59 dev_dbg(&dev->dev, "carrier report (freq: %d)\n", sample);
60
61
62 } else if (ev.timeout) {
63 if (dev->gap)
64 return;
65
66 dev->gap_start = ktime_get();
67 dev->gap = true;
68 dev->gap_duration = ev.duration;
69
70 sample = LIRC_TIMEOUT(ev.duration);
71 dev_dbg(&dev->dev, "timeout report (duration: %d)\n", sample);
72
73
74 } else {
75 if (dev->gap) {
76 dev->gap_duration += ktime_to_us(ktime_sub(ktime_get(),
77 dev->gap_start));
78
79
80 dev->gap_duration = min_t(u64, dev->gap_duration,
81 LIRC_VALUE_MASK);
82
83 spin_lock_irqsave(&dev->lirc_fh_lock, flags);
84 list_for_each_entry(fh, &dev->lirc_fh, list)
85 kfifo_put(&fh->rawir,
86 LIRC_SPACE(dev->gap_duration));
87 spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
88 dev->gap = false;
89 }
90
91 sample = ev.pulse ? LIRC_PULSE(ev.duration) :
92 LIRC_SPACE(ev.duration);
93 dev_dbg(&dev->dev, "delivering %uus %s to lirc_dev\n",
94 ev.duration, TO_STR(ev.pulse));
95 }
96
97
98
99
100
101 lirc_bpf_run(dev, sample);
102
103 spin_lock_irqsave(&dev->lirc_fh_lock, flags);
104 list_for_each_entry(fh, &dev->lirc_fh, list) {
105 if (LIRC_IS_TIMEOUT(sample) && !fh->send_timeout_reports)
106 continue;
107 if (kfifo_put(&fh->rawir, sample))
108 wake_up_poll(&fh->wait_poll, EPOLLIN | EPOLLRDNORM);
109 }
110 spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
111}
112
113
114
115
116
117
118
119void lirc_scancode_event(struct rc_dev *dev, struct lirc_scancode *lsc)
120{
121 unsigned long flags;
122 struct lirc_fh *fh;
123
124 lsc->timestamp = ktime_get_ns();
125
126 spin_lock_irqsave(&dev->lirc_fh_lock, flags);
127 list_for_each_entry(fh, &dev->lirc_fh, list) {
128 if (kfifo_put(&fh->scancodes, *lsc))
129 wake_up_poll(&fh->wait_poll, EPOLLIN | EPOLLRDNORM);
130 }
131 spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
132}
133EXPORT_SYMBOL_GPL(lirc_scancode_event);
134
135static int lirc_open(struct inode *inode, struct file *file)
136{
137 struct rc_dev *dev = container_of(inode->i_cdev, struct rc_dev,
138 lirc_cdev);
139 struct lirc_fh *fh = kzalloc(sizeof(*fh), GFP_KERNEL);
140 unsigned long flags;
141 int retval;
142
143 if (!fh)
144 return -ENOMEM;
145
146 get_device(&dev->dev);
147
148 if (!dev->registered) {
149 retval = -ENODEV;
150 goto out_fh;
151 }
152
153 if (dev->driver_type == RC_DRIVER_IR_RAW) {
154 if (kfifo_alloc(&fh->rawir, MAX_IR_EVENT_SIZE, GFP_KERNEL)) {
155 retval = -ENOMEM;
156 goto out_fh;
157 }
158 }
159
160 if (dev->driver_type != RC_DRIVER_IR_RAW_TX) {
161 if (kfifo_alloc(&fh->scancodes, 32, GFP_KERNEL)) {
162 retval = -ENOMEM;
163 goto out_rawir;
164 }
165 }
166
167 fh->send_mode = LIRC_MODE_PULSE;
168 fh->rc = dev;
169 fh->send_timeout_reports = true;
170
171 if (dev->driver_type == RC_DRIVER_SCANCODE)
172 fh->rec_mode = LIRC_MODE_SCANCODE;
173 else
174 fh->rec_mode = LIRC_MODE_MODE2;
175
176 retval = rc_open(dev);
177 if (retval)
178 goto out_kfifo;
179
180 init_waitqueue_head(&fh->wait_poll);
181
182 file->private_data = fh;
183 spin_lock_irqsave(&dev->lirc_fh_lock, flags);
184 list_add(&fh->list, &dev->lirc_fh);
185 spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
186
187 stream_open(inode, file);
188
189 return 0;
190out_kfifo:
191 if (dev->driver_type != RC_DRIVER_IR_RAW_TX)
192 kfifo_free(&fh->scancodes);
193out_rawir:
194 if (dev->driver_type == RC_DRIVER_IR_RAW)
195 kfifo_free(&fh->rawir);
196out_fh:
197 kfree(fh);
198 put_device(&dev->dev);
199
200 return retval;
201}
202
203static int lirc_close(struct inode *inode, struct file *file)
204{
205 struct lirc_fh *fh = file->private_data;
206 struct rc_dev *dev = fh->rc;
207 unsigned long flags;
208
209 spin_lock_irqsave(&dev->lirc_fh_lock, flags);
210 list_del(&fh->list);
211 spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
212
213 if (dev->driver_type == RC_DRIVER_IR_RAW)
214 kfifo_free(&fh->rawir);
215 if (dev->driver_type != RC_DRIVER_IR_RAW_TX)
216 kfifo_free(&fh->scancodes);
217 kfree(fh);
218
219 rc_close(dev);
220 put_device(&dev->dev);
221
222 return 0;
223}
224
225static ssize_t lirc_transmit(struct file *file, const char __user *buf,
226 size_t n, loff_t *ppos)
227{
228 struct lirc_fh *fh = file->private_data;
229 struct rc_dev *dev = fh->rc;
230 unsigned int *txbuf;
231 struct ir_raw_event *raw = NULL;
232 ssize_t ret;
233 size_t count;
234 ktime_t start;
235 s64 towait;
236 unsigned int duration = 0;
237 int i;
238
239 ret = mutex_lock_interruptible(&dev->lock);
240 if (ret)
241 return ret;
242
243 if (!dev->registered) {
244 ret = -ENODEV;
245 goto out_unlock;
246 }
247
248 if (!dev->tx_ir) {
249 ret = -EINVAL;
250 goto out_unlock;
251 }
252
253 if (fh->send_mode == LIRC_MODE_SCANCODE) {
254 struct lirc_scancode scan;
255
256 if (n != sizeof(scan)) {
257 ret = -EINVAL;
258 goto out_unlock;
259 }
260
261 if (copy_from_user(&scan, buf, sizeof(scan))) {
262 ret = -EFAULT;
263 goto out_unlock;
264 }
265
266 if (scan.flags || scan.keycode || scan.timestamp ||
267 scan.rc_proto > RC_PROTO_MAX) {
268 ret = -EINVAL;
269 goto out_unlock;
270 }
271
272
273 if (scan.scancode > U32_MAX ||
274 !rc_validate_scancode(scan.rc_proto, scan.scancode)) {
275 ret = -EINVAL;
276 goto out_unlock;
277 }
278
279 raw = kmalloc_array(LIRCBUF_SIZE, sizeof(*raw), GFP_KERNEL);
280 if (!raw) {
281 ret = -ENOMEM;
282 goto out_unlock;
283 }
284
285 ret = ir_raw_encode_scancode(scan.rc_proto, scan.scancode,
286 raw, LIRCBUF_SIZE);
287 if (ret < 0)
288 goto out_kfree_raw;
289
290 count = ret;
291
292 txbuf = kmalloc_array(count, sizeof(unsigned int), GFP_KERNEL);
293 if (!txbuf) {
294 ret = -ENOMEM;
295 goto out_kfree_raw;
296 }
297
298 for (i = 0; i < count; i++)
299 txbuf[i] = raw[i].duration;
300
301 if (dev->s_tx_carrier) {
302 int carrier = ir_raw_encode_carrier(scan.rc_proto);
303
304 if (carrier > 0)
305 dev->s_tx_carrier(dev, carrier);
306 }
307 } else {
308 if (n < sizeof(unsigned int) || n % sizeof(unsigned int)) {
309 ret = -EINVAL;
310 goto out_unlock;
311 }
312
313 count = n / sizeof(unsigned int);
314 if (count > LIRCBUF_SIZE || count % 2 == 0) {
315 ret = -EINVAL;
316 goto out_unlock;
317 }
318
319 txbuf = memdup_user(buf, n);
320 if (IS_ERR(txbuf)) {
321 ret = PTR_ERR(txbuf);
322 goto out_unlock;
323 }
324 }
325
326 for (i = 0; i < count; i++) {
327 if (txbuf[i] > IR_MAX_DURATION - duration || !txbuf[i]) {
328 ret = -EINVAL;
329 goto out_kfree;
330 }
331
332 duration += txbuf[i];
333 }
334
335 start = ktime_get();
336
337 ret = dev->tx_ir(dev, txbuf, count);
338 if (ret < 0)
339 goto out_kfree;
340
341 kfree(txbuf);
342 kfree(raw);
343 mutex_unlock(&dev->lock);
344
345
346
347
348
349
350 towait = ktime_us_delta(ktime_add_us(start, duration),
351 ktime_get());
352 if (towait > 0) {
353 set_current_state(TASK_INTERRUPTIBLE);
354 schedule_timeout(usecs_to_jiffies(towait));
355 }
356
357 return n;
358out_kfree:
359 kfree(txbuf);
360out_kfree_raw:
361 kfree(raw);
362out_unlock:
363 mutex_unlock(&dev->lock);
364 return ret;
365}
366
367static long lirc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
368{
369 struct lirc_fh *fh = file->private_data;
370 struct rc_dev *dev = fh->rc;
371 u32 __user *argp = (u32 __user *)(arg);
372 u32 val = 0;
373 int ret;
374
375 if (_IOC_DIR(cmd) & _IOC_WRITE) {
376 ret = get_user(val, argp);
377 if (ret)
378 return ret;
379 }
380
381 ret = mutex_lock_interruptible(&dev->lock);
382 if (ret)
383 return ret;
384
385 if (!dev->registered) {
386 ret = -ENODEV;
387 goto out;
388 }
389
390 switch (cmd) {
391 case LIRC_GET_FEATURES:
392 if (dev->driver_type == RC_DRIVER_SCANCODE)
393 val |= LIRC_CAN_REC_SCANCODE;
394
395 if (dev->driver_type == RC_DRIVER_IR_RAW) {
396 val |= LIRC_CAN_REC_MODE2;
397 if (dev->rx_resolution)
398 val |= LIRC_CAN_GET_REC_RESOLUTION;
399 }
400
401 if (dev->tx_ir) {
402 val |= LIRC_CAN_SEND_PULSE;
403 if (dev->s_tx_mask)
404 val |= LIRC_CAN_SET_TRANSMITTER_MASK;
405 if (dev->s_tx_carrier)
406 val |= LIRC_CAN_SET_SEND_CARRIER;
407 if (dev->s_tx_duty_cycle)
408 val |= LIRC_CAN_SET_SEND_DUTY_CYCLE;
409 }
410
411 if (dev->s_rx_carrier_range)
412 val |= LIRC_CAN_SET_REC_CARRIER |
413 LIRC_CAN_SET_REC_CARRIER_RANGE;
414
415 if (dev->s_wideband_receiver)
416 val |= LIRC_CAN_USE_WIDEBAND_RECEIVER;
417
418 if (dev->s_carrier_report)
419 val |= LIRC_CAN_MEASURE_CARRIER;
420
421 if (dev->max_timeout)
422 val |= LIRC_CAN_SET_REC_TIMEOUT;
423
424 break;
425
426
427 case LIRC_GET_REC_MODE:
428 if (dev->driver_type == RC_DRIVER_IR_RAW_TX)
429 ret = -ENOTTY;
430 else
431 val = fh->rec_mode;
432 break;
433
434 case LIRC_SET_REC_MODE:
435 switch (dev->driver_type) {
436 case RC_DRIVER_IR_RAW_TX:
437 ret = -ENOTTY;
438 break;
439 case RC_DRIVER_SCANCODE:
440 if (val != LIRC_MODE_SCANCODE)
441 ret = -EINVAL;
442 break;
443 case RC_DRIVER_IR_RAW:
444 if (!(val == LIRC_MODE_MODE2 ||
445 val == LIRC_MODE_SCANCODE))
446 ret = -EINVAL;
447 break;
448 }
449
450 if (!ret)
451 fh->rec_mode = val;
452 break;
453
454 case LIRC_GET_SEND_MODE:
455 if (!dev->tx_ir)
456 ret = -ENOTTY;
457 else
458 val = fh->send_mode;
459 break;
460
461 case LIRC_SET_SEND_MODE:
462 if (!dev->tx_ir)
463 ret = -ENOTTY;
464 else if (!(val == LIRC_MODE_PULSE || val == LIRC_MODE_SCANCODE))
465 ret = -EINVAL;
466 else
467 fh->send_mode = val;
468 break;
469
470
471 case LIRC_SET_TRANSMITTER_MASK:
472 if (!dev->s_tx_mask)
473 ret = -ENOTTY;
474 else
475 ret = dev->s_tx_mask(dev, val);
476 break;
477
478 case LIRC_SET_SEND_CARRIER:
479 if (!dev->s_tx_carrier)
480 ret = -ENOTTY;
481 else
482 ret = dev->s_tx_carrier(dev, val);
483 break;
484
485 case LIRC_SET_SEND_DUTY_CYCLE:
486 if (!dev->s_tx_duty_cycle)
487 ret = -ENOTTY;
488 else if (val <= 0 || val >= 100)
489 ret = -EINVAL;
490 else
491 ret = dev->s_tx_duty_cycle(dev, val);
492 break;
493
494
495 case LIRC_SET_REC_CARRIER:
496 if (!dev->s_rx_carrier_range)
497 ret = -ENOTTY;
498 else if (val <= 0)
499 ret = -EINVAL;
500 else
501 ret = dev->s_rx_carrier_range(dev, fh->carrier_low,
502 val);
503 break;
504
505 case LIRC_SET_REC_CARRIER_RANGE:
506 if (!dev->s_rx_carrier_range)
507 ret = -ENOTTY;
508 else if (val <= 0)
509 ret = -EINVAL;
510 else
511 fh->carrier_low = val;
512 break;
513
514 case LIRC_GET_REC_RESOLUTION:
515 if (!dev->rx_resolution)
516 ret = -ENOTTY;
517 else
518 val = dev->rx_resolution;
519 break;
520
521 case LIRC_SET_WIDEBAND_RECEIVER:
522 if (!dev->s_wideband_receiver)
523 ret = -ENOTTY;
524 else
525 ret = dev->s_wideband_receiver(dev, !!val);
526 break;
527
528 case LIRC_SET_MEASURE_CARRIER_MODE:
529 if (!dev->s_carrier_report)
530 ret = -ENOTTY;
531 else
532 ret = dev->s_carrier_report(dev, !!val);
533 break;
534
535
536 case LIRC_GET_MIN_TIMEOUT:
537 if (!dev->max_timeout)
538 ret = -ENOTTY;
539 else
540 val = dev->min_timeout;
541 break;
542
543 case LIRC_GET_MAX_TIMEOUT:
544 if (!dev->max_timeout)
545 ret = -ENOTTY;
546 else
547 val = dev->max_timeout;
548 break;
549
550 case LIRC_SET_REC_TIMEOUT:
551 if (!dev->max_timeout) {
552 ret = -ENOTTY;
553 } else {
554 if (val < dev->min_timeout || val > dev->max_timeout)
555 ret = -EINVAL;
556 else if (dev->s_timeout)
557 ret = dev->s_timeout(dev, val);
558 else
559 dev->timeout = val;
560 }
561 break;
562
563 case LIRC_GET_REC_TIMEOUT:
564 if (!dev->timeout)
565 ret = -ENOTTY;
566 else
567 val = dev->timeout;
568 break;
569
570 case LIRC_SET_REC_TIMEOUT_REPORTS:
571 if (dev->driver_type != RC_DRIVER_IR_RAW)
572 ret = -ENOTTY;
573 else
574 fh->send_timeout_reports = !!val;
575 break;
576
577 default:
578 ret = -ENOTTY;
579 }
580
581 if (!ret && _IOC_DIR(cmd) & _IOC_READ)
582 ret = put_user(val, argp);
583
584out:
585 mutex_unlock(&dev->lock);
586 return ret;
587}
588
589static __poll_t lirc_poll(struct file *file, struct poll_table_struct *wait)
590{
591 struct lirc_fh *fh = file->private_data;
592 struct rc_dev *rcdev = fh->rc;
593 __poll_t events = 0;
594
595 poll_wait(file, &fh->wait_poll, wait);
596
597 if (!rcdev->registered) {
598 events = EPOLLHUP | EPOLLERR;
599 } else if (rcdev->driver_type != RC_DRIVER_IR_RAW_TX) {
600 if (fh->rec_mode == LIRC_MODE_SCANCODE &&
601 !kfifo_is_empty(&fh->scancodes))
602 events = EPOLLIN | EPOLLRDNORM;
603
604 if (fh->rec_mode == LIRC_MODE_MODE2 &&
605 !kfifo_is_empty(&fh->rawir))
606 events = EPOLLIN | EPOLLRDNORM;
607 }
608
609 return events;
610}
611
612static ssize_t lirc_read_mode2(struct file *file, char __user *buffer,
613 size_t length)
614{
615 struct lirc_fh *fh = file->private_data;
616 struct rc_dev *rcdev = fh->rc;
617 unsigned int copied;
618 int ret;
619
620 if (length < sizeof(unsigned int) || length % sizeof(unsigned int))
621 return -EINVAL;
622
623 do {
624 if (kfifo_is_empty(&fh->rawir)) {
625 if (file->f_flags & O_NONBLOCK)
626 return -EAGAIN;
627
628 ret = wait_event_interruptible(fh->wait_poll,
629 !kfifo_is_empty(&fh->rawir) ||
630 !rcdev->registered);
631 if (ret)
632 return ret;
633 }
634
635 if (!rcdev->registered)
636 return -ENODEV;
637
638 ret = mutex_lock_interruptible(&rcdev->lock);
639 if (ret)
640 return ret;
641 ret = kfifo_to_user(&fh->rawir, buffer, length, &copied);
642 mutex_unlock(&rcdev->lock);
643 if (ret)
644 return ret;
645 } while (copied == 0);
646
647 return copied;
648}
649
650static ssize_t lirc_read_scancode(struct file *file, char __user *buffer,
651 size_t length)
652{
653 struct lirc_fh *fh = file->private_data;
654 struct rc_dev *rcdev = fh->rc;
655 unsigned int copied;
656 int ret;
657
658 if (length < sizeof(struct lirc_scancode) ||
659 length % sizeof(struct lirc_scancode))
660 return -EINVAL;
661
662 do {
663 if (kfifo_is_empty(&fh->scancodes)) {
664 if (file->f_flags & O_NONBLOCK)
665 return -EAGAIN;
666
667 ret = wait_event_interruptible(fh->wait_poll,
668 !kfifo_is_empty(&fh->scancodes) ||
669 !rcdev->registered);
670 if (ret)
671 return ret;
672 }
673
674 if (!rcdev->registered)
675 return -ENODEV;
676
677 ret = mutex_lock_interruptible(&rcdev->lock);
678 if (ret)
679 return ret;
680 ret = kfifo_to_user(&fh->scancodes, buffer, length, &copied);
681 mutex_unlock(&rcdev->lock);
682 if (ret)
683 return ret;
684 } while (copied == 0);
685
686 return copied;
687}
688
689static ssize_t lirc_read(struct file *file, char __user *buffer, size_t length,
690 loff_t *ppos)
691{
692 struct lirc_fh *fh = file->private_data;
693 struct rc_dev *rcdev = fh->rc;
694
695 if (rcdev->driver_type == RC_DRIVER_IR_RAW_TX)
696 return -EINVAL;
697
698 if (!rcdev->registered)
699 return -ENODEV;
700
701 if (fh->rec_mode == LIRC_MODE_MODE2)
702 return lirc_read_mode2(file, buffer, length);
703 else
704 return lirc_read_scancode(file, buffer, length);
705}
706
707static const struct file_operations lirc_fops = {
708 .owner = THIS_MODULE,
709 .write = lirc_transmit,
710 .unlocked_ioctl = lirc_ioctl,
711 .compat_ioctl = compat_ptr_ioctl,
712 .read = lirc_read,
713 .poll = lirc_poll,
714 .open = lirc_open,
715 .release = lirc_close,
716 .llseek = no_llseek,
717};
718
719static void lirc_release_device(struct device *ld)
720{
721 struct rc_dev *rcdev = container_of(ld, struct rc_dev, lirc_dev);
722
723 put_device(&rcdev->dev);
724}
725
726int lirc_register(struct rc_dev *dev)
727{
728 const char *rx_type, *tx_type;
729 int err, minor;
730
731 minor = ida_simple_get(&lirc_ida, 0, RC_DEV_MAX, GFP_KERNEL);
732 if (minor < 0)
733 return minor;
734
735 device_initialize(&dev->lirc_dev);
736 dev->lirc_dev.class = lirc_class;
737 dev->lirc_dev.parent = &dev->dev;
738 dev->lirc_dev.release = lirc_release_device;
739 dev->lirc_dev.devt = MKDEV(MAJOR(lirc_base_dev), minor);
740 dev_set_name(&dev->lirc_dev, "lirc%d", minor);
741
742 INIT_LIST_HEAD(&dev->lirc_fh);
743 spin_lock_init(&dev->lirc_fh_lock);
744
745 cdev_init(&dev->lirc_cdev, &lirc_fops);
746
747 err = cdev_device_add(&dev->lirc_cdev, &dev->lirc_dev);
748 if (err)
749 goto out_ida;
750
751 get_device(&dev->dev);
752
753 switch (dev->driver_type) {
754 case RC_DRIVER_SCANCODE:
755 rx_type = "scancode";
756 break;
757 case RC_DRIVER_IR_RAW:
758 rx_type = "raw IR";
759 break;
760 default:
761 rx_type = "no";
762 break;
763 }
764
765 if (dev->tx_ir)
766 tx_type = "raw IR";
767 else
768 tx_type = "no";
769
770 dev_info(&dev->dev, "lirc_dev: driver %s registered at minor = %d, %s receiver, %s transmitter",
771 dev->driver_name, minor, rx_type, tx_type);
772
773 return 0;
774
775out_ida:
776 ida_simple_remove(&lirc_ida, minor);
777 return err;
778}
779
780void lirc_unregister(struct rc_dev *dev)
781{
782 unsigned long flags;
783 struct lirc_fh *fh;
784
785 dev_dbg(&dev->dev, "lirc_dev: driver %s unregistered from minor = %d\n",
786 dev->driver_name, MINOR(dev->lirc_dev.devt));
787
788 spin_lock_irqsave(&dev->lirc_fh_lock, flags);
789 list_for_each_entry(fh, &dev->lirc_fh, list)
790 wake_up_poll(&fh->wait_poll, EPOLLHUP | EPOLLERR);
791 spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
792
793 cdev_device_del(&dev->lirc_cdev, &dev->lirc_dev);
794 ida_simple_remove(&lirc_ida, MINOR(dev->lirc_dev.devt));
795}
796
797int __init lirc_dev_init(void)
798{
799 int retval;
800
801 lirc_class = class_create(THIS_MODULE, "lirc");
802 if (IS_ERR(lirc_class)) {
803 pr_err("class_create failed\n");
804 return PTR_ERR(lirc_class);
805 }
806
807 retval = alloc_chrdev_region(&lirc_base_dev, 0, RC_DEV_MAX, "lirc");
808 if (retval) {
809 class_destroy(lirc_class);
810 pr_err("alloc_chrdev_region failed\n");
811 return retval;
812 }
813
814 pr_debug("IR Remote Control driver registered, major %d\n",
815 MAJOR(lirc_base_dev));
816
817 return 0;
818}
819
820void __exit lirc_dev_exit(void)
821{
822 class_destroy(lirc_class);
823 unregister_chrdev_region(lirc_base_dev, RC_DEV_MAX);
824}
825
826struct rc_dev *rc_dev_get_from_fd(int fd)
827{
828 struct fd f = fdget(fd);
829 struct lirc_fh *fh;
830 struct rc_dev *dev;
831
832 if (!f.file)
833 return ERR_PTR(-EBADF);
834
835 if (f.file->f_op != &lirc_fops) {
836 fdput(f);
837 return ERR_PTR(-EINVAL);
838 }
839
840 fh = f.file->private_data;
841 dev = fh->rc;
842
843 get_device(&dev->dev);
844 fdput(f);
845
846 return dev;
847}
848
849MODULE_ALIAS("lirc_dev");
850
