1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * LIRC base driver
4 *
5 * by Artur Lipowski <alipowski@interia.pl>
6 */
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
24 static dev_t lirc_base_dev;
25
26 /* Used to keep track of allocated lirc devices */
27 static DEFINE_IDA(lirc_ida);
28
29 /* Only used for sysfs but defined to void otherwise */
30 static struct class *lirc_class;
31
32 /**
33 * lirc_raw_event() - Send raw IR data to lirc to be relayed to userspace
34 *
35 * @dev: the struct rc_dev descriptor of the device
36 * @ev: the struct ir_raw_event descriptor of the pulse/space
37 */
lirc_raw_event(struct rc_dev * dev,struct ir_raw_event ev)38 void 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 /* Packet start */
45 if (ev.reset) {
46 /*
47 * Userspace expects a long space event before the start of
48 * the signal to use as a sync. This may be done with repeat
49 * packets and normal samples. But if a reset has been sent
50 * then we assume that a long time has passed, so we send a
51 * space with the maximum time value.
52 */
53 sample = LIRC_SPACE(LIRC_VALUE_MASK);
54 dev_dbg(&dev->dev, "delivering reset sync space to lirc_dev\n");
55
56 /* Carrier reports */
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 /* Packet end */
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 /* Normal sample */
74 } else {
75 if (dev->gap) {
76 dev->gap_duration += ktime_to_us(ktime_sub(ktime_get(),
77 dev->gap_start));
78
79 /* Cap by LIRC_VALUE_MASK */
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 * bpf does not care about the gap generated above; that exists
99 * for backwards compatibility
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 * lirc_scancode_event() - Send scancode data to lirc to be relayed to
115 * userspace. This can be called in atomic context.
116 * @dev: the struct rc_dev descriptor of the device
117 * @lsc: the struct lirc_scancode describing the decoded scancode
118 */
lirc_scancode_event(struct rc_dev * dev,struct lirc_scancode * lsc)119 void 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 }
133 EXPORT_SYMBOL_GPL(lirc_scancode_event);
134
lirc_open(struct inode * inode,struct file * file)135 static 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;
190 out_kfifo:
191 if (dev->driver_type != RC_DRIVER_IR_RAW_TX)
192 kfifo_free(&fh->scancodes);
193 out_rawir:
194 if (dev->driver_type == RC_DRIVER_IR_RAW)
195 kfifo_free(&fh->rawir);
196 out_fh:
197 kfree(fh);
198 put_device(&dev->dev);
199
200 return retval;
201 }
202
lirc_close(struct inode * inode,struct file * file)203 static 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
lirc_transmit(struct file * file,const char __user * buf,size_t n,loff_t * ppos)225 static 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; /* signal duration in us */
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 ret = -EINVAL;
268 goto out_unlock;
269 }
270
271 /* We only have encoders for 32-bit protocols. */
272 if (scan.scancode > U32_MAX ||
273 !rc_validate_scancode(scan.rc_proto, scan.scancode)) {
274 ret = -EINVAL;
275 goto out_unlock;
276 }
277
278 raw = kmalloc_array(LIRCBUF_SIZE, sizeof(*raw), GFP_KERNEL);
279 if (!raw) {
280 ret = -ENOMEM;
281 goto out_unlock;
282 }
283
284 ret = ir_raw_encode_scancode(scan.rc_proto, scan.scancode,
285 raw, LIRCBUF_SIZE);
286 if (ret < 0)
287 goto out_kfree_raw;
288
289 count = ret;
290
291 txbuf = kmalloc_array(count, sizeof(unsigned int), GFP_KERNEL);
292 if (!txbuf) {
293 ret = -ENOMEM;
294 goto out_kfree_raw;
295 }
296
297 for (i = 0; i < count; i++)
298 txbuf[i] = raw[i].duration;
299
300 if (dev->s_tx_carrier) {
301 int carrier = ir_raw_encode_carrier(scan.rc_proto);
302
303 if (carrier > 0)
304 dev->s_tx_carrier(dev, carrier);
305 }
306 } else {
307 if (n < sizeof(unsigned int) || n % sizeof(unsigned int)) {
308 ret = -EINVAL;
309 goto out_unlock;
310 }
311
312 count = n / sizeof(unsigned int);
313 if (count > LIRCBUF_SIZE || count % 2 == 0) {
314 ret = -EINVAL;
315 goto out_unlock;
316 }
317
318 txbuf = memdup_user(buf, n);
319 if (IS_ERR(txbuf)) {
320 ret = PTR_ERR(txbuf);
321 goto out_unlock;
322 }
323 }
324
325 for (i = 0; i < count; i++) {
326 if (txbuf[i] > IR_MAX_DURATION - duration || !txbuf[i]) {
327 ret = -EINVAL;
328 goto out_kfree;
329 }
330
331 duration += txbuf[i];
332 }
333
334 start = ktime_get();
335
336 ret = dev->tx_ir(dev, txbuf, count);
337 if (ret < 0)
338 goto out_kfree;
339
340 kfree(txbuf);
341 kfree(raw);
342 mutex_unlock(&dev->lock);
343
344 /*
345 * The lircd gap calculation expects the write function to
346 * wait for the actual IR signal to be transmitted before
347 * returning.
348 */
349 towait = ktime_us_delta(ktime_add_us(start, duration),
350 ktime_get());
351 if (towait > 0) {
352 set_current_state(TASK_INTERRUPTIBLE);
353 schedule_timeout(usecs_to_jiffies(towait));
354 }
355
356 return n;
357 out_kfree:
358 kfree(txbuf);
359 out_kfree_raw:
360 kfree(raw);
361 out_unlock:
362 mutex_unlock(&dev->lock);
363 return ret;
364 }
365
lirc_ioctl(struct file * file,unsigned int cmd,unsigned long arg)366 static long lirc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
367 {
368 struct lirc_fh *fh = file->private_data;
369 struct rc_dev *dev = fh->rc;
370 u32 __user *argp = (u32 __user *)(arg);
371 u32 val = 0;
372 int ret;
373
374 if (_IOC_DIR(cmd) & _IOC_WRITE) {
375 ret = get_user(val, argp);
376 if (ret)
377 return ret;
378 }
379
380 ret = mutex_lock_interruptible(&dev->lock);
381 if (ret)
382 return ret;
383
384 if (!dev->registered) {
385 ret = -ENODEV;
386 goto out;
387 }
388
389 switch (cmd) {
390 case LIRC_GET_FEATURES:
391 if (dev->driver_type == RC_DRIVER_SCANCODE)
392 val |= LIRC_CAN_REC_SCANCODE;
393
394 if (dev->driver_type == RC_DRIVER_IR_RAW) {
395 val |= LIRC_CAN_REC_MODE2;
396 if (dev->rx_resolution)
397 val |= LIRC_CAN_GET_REC_RESOLUTION;
398 }
399
400 if (dev->tx_ir) {
401 val |= LIRC_CAN_SEND_PULSE;
402 if (dev->s_tx_mask)
403 val |= LIRC_CAN_SET_TRANSMITTER_MASK;
404 if (dev->s_tx_carrier)
405 val |= LIRC_CAN_SET_SEND_CARRIER;
406 if (dev->s_tx_duty_cycle)
407 val |= LIRC_CAN_SET_SEND_DUTY_CYCLE;
408 }
409
410 if (dev->s_rx_carrier_range)
411 val |= LIRC_CAN_SET_REC_CARRIER |
412 LIRC_CAN_SET_REC_CARRIER_RANGE;
413
414 if (dev->s_learning_mode)
415 val |= LIRC_CAN_USE_WIDEBAND_RECEIVER;
416
417 if (dev->s_carrier_report)
418 val |= LIRC_CAN_MEASURE_CARRIER;
419
420 if (dev->max_timeout)
421 val |= LIRC_CAN_SET_REC_TIMEOUT;
422
423 break;
424
425 /* mode support */
426 case LIRC_GET_REC_MODE:
427 if (dev->driver_type == RC_DRIVER_IR_RAW_TX)
428 ret = -ENOTTY;
429 else
430 val = fh->rec_mode;
431 break;
432
433 case LIRC_SET_REC_MODE:
434 switch (dev->driver_type) {
435 case RC_DRIVER_IR_RAW_TX:
436 ret = -ENOTTY;
437 break;
438 case RC_DRIVER_SCANCODE:
439 if (val != LIRC_MODE_SCANCODE)
440 ret = -EINVAL;
441 break;
442 case RC_DRIVER_IR_RAW:
443 if (!(val == LIRC_MODE_MODE2 ||
444 val == LIRC_MODE_SCANCODE))
445 ret = -EINVAL;
446 break;
447 }
448
449 if (!ret)
450 fh->rec_mode = val;
451 break;
452
453 case LIRC_GET_SEND_MODE:
454 if (!dev->tx_ir)
455 ret = -ENOTTY;
456 else
457 val = fh->send_mode;
458 break;
459
460 case LIRC_SET_SEND_MODE:
461 if (!dev->tx_ir)
462 ret = -ENOTTY;
463 else if (!(val == LIRC_MODE_PULSE || val == LIRC_MODE_SCANCODE))
464 ret = -EINVAL;
465 else
466 fh->send_mode = val;
467 break;
468
469 /* TX settings */
470 case LIRC_SET_TRANSMITTER_MASK:
471 if (!dev->s_tx_mask)
472 ret = -ENOTTY;
473 else
474 ret = dev->s_tx_mask(dev, val);
475 break;
476
477 case LIRC_SET_SEND_CARRIER:
478 if (!dev->s_tx_carrier)
479 ret = -ENOTTY;
480 else
481 ret = dev->s_tx_carrier(dev, val);
482 break;
483
484 case LIRC_SET_SEND_DUTY_CYCLE:
485 if (!dev->s_tx_duty_cycle)
486 ret = -ENOTTY;
487 else if (val <= 0 || val >= 100)
488 ret = -EINVAL;
489 else
490 ret = dev->s_tx_duty_cycle(dev, val);
491 break;
492
493 /* RX settings */
494 case LIRC_SET_REC_CARRIER:
495 if (!dev->s_rx_carrier_range)
496 ret = -ENOTTY;
497 else if (val <= 0)
498 ret = -EINVAL;
499 else
500 ret = dev->s_rx_carrier_range(dev, fh->carrier_low,
501 val);
502 break;
503
504 case LIRC_SET_REC_CARRIER_RANGE:
505 if (!dev->s_rx_carrier_range)
506 ret = -ENOTTY;
507 else if (val <= 0)
508 ret = -EINVAL;
509 else
510 fh->carrier_low = val;
511 break;
512
513 case LIRC_GET_REC_RESOLUTION:
514 if (!dev->rx_resolution)
515 ret = -ENOTTY;
516 else
517 val = dev->rx_resolution;
518 break;
519
520 case LIRC_SET_WIDEBAND_RECEIVER:
521 if (!dev->s_learning_mode)
522 ret = -ENOTTY;
523 else
524 ret = dev->s_learning_mode(dev, !!val);
525 break;
526
527 case LIRC_SET_MEASURE_CARRIER_MODE:
528 if (!dev->s_carrier_report)
529 ret = -ENOTTY;
530 else
531 ret = dev->s_carrier_report(dev, !!val);
532 break;
533
534 /* Generic timeout support */
535 case LIRC_GET_MIN_TIMEOUT:
536 if (!dev->max_timeout)
537 ret = -ENOTTY;
538 else
539 val = dev->min_timeout;
540 break;
541
542 case LIRC_GET_MAX_TIMEOUT:
543 if (!dev->max_timeout)
544 ret = -ENOTTY;
545 else
546 val = dev->max_timeout;
547 break;
548
549 case LIRC_SET_REC_TIMEOUT:
550 if (!dev->max_timeout) {
551 ret = -ENOTTY;
552 } else {
553 if (val < dev->min_timeout || val > dev->max_timeout)
554 ret = -EINVAL;
555 else if (dev->s_timeout)
556 ret = dev->s_timeout(dev, val);
557 else
558 dev->timeout = val;
559 }
560 break;
561
562 case LIRC_GET_REC_TIMEOUT:
563 if (!dev->timeout)
564 ret = -ENOTTY;
565 else
566 val = dev->timeout;
567 break;
568
569 case LIRC_SET_REC_TIMEOUT_REPORTS:
570 if (dev->driver_type != RC_DRIVER_IR_RAW)
571 ret = -ENOTTY;
572 else
573 fh->send_timeout_reports = !!val;
574 break;
575
576 default:
577 ret = -ENOTTY;
578 }
579
580 if (!ret && _IOC_DIR(cmd) & _IOC_READ)
581 ret = put_user(val, argp);
582
583 out:
584 mutex_unlock(&dev->lock);
585 return ret;
586 }
587
lirc_poll(struct file * file,struct poll_table_struct * wait)588 static __poll_t lirc_poll(struct file *file, struct poll_table_struct *wait)
589 {
590 struct lirc_fh *fh = file->private_data;
591 struct rc_dev *rcdev = fh->rc;
592 __poll_t events = 0;
593
594 poll_wait(file, &fh->wait_poll, wait);
595
596 if (!rcdev->registered) {
597 events = EPOLLHUP | EPOLLERR;
598 } else if (rcdev->driver_type != RC_DRIVER_IR_RAW_TX) {
599 if (fh->rec_mode == LIRC_MODE_SCANCODE &&
600 !kfifo_is_empty(&fh->scancodes))
601 events = EPOLLIN | EPOLLRDNORM;
602
603 if (fh->rec_mode == LIRC_MODE_MODE2 &&
604 !kfifo_is_empty(&fh->rawir))
605 events = EPOLLIN | EPOLLRDNORM;
606 }
607
608 return events;
609 }
610
lirc_read_mode2(struct file * file,char __user * buffer,size_t length)611 static ssize_t lirc_read_mode2(struct file *file, char __user *buffer,
612 size_t length)
613 {
614 struct lirc_fh *fh = file->private_data;
615 struct rc_dev *rcdev = fh->rc;
616 unsigned int copied;
617 int ret;
618
619 if (length < sizeof(unsigned int) || length % sizeof(unsigned int))
620 return -EINVAL;
621
622 do {
623 if (kfifo_is_empty(&fh->rawir)) {
624 if (file->f_flags & O_NONBLOCK)
625 return -EAGAIN;
626
627 ret = wait_event_interruptible(fh->wait_poll,
628 !kfifo_is_empty(&fh->rawir) ||
629 !rcdev->registered);
630 if (ret)
631 return ret;
632 }
633
634 if (!rcdev->registered)
635 return -ENODEV;
636
637 ret = mutex_lock_interruptible(&rcdev->lock);
638 if (ret)
639 return ret;
640 ret = kfifo_to_user(&fh->rawir, buffer, length, &copied);
641 mutex_unlock(&rcdev->lock);
642 if (ret)
643 return ret;
644 } while (copied == 0);
645
646 return copied;
647 }
648
lirc_read_scancode(struct file * file,char __user * buffer,size_t length)649 static ssize_t lirc_read_scancode(struct file *file, char __user *buffer,
650 size_t length)
651 {
652 struct lirc_fh *fh = file->private_data;
653 struct rc_dev *rcdev = fh->rc;
654 unsigned int copied;
655 int ret;
656
657 if (length < sizeof(struct lirc_scancode) ||
658 length % sizeof(struct lirc_scancode))
659 return -EINVAL;
660
661 do {
662 if (kfifo_is_empty(&fh->scancodes)) {
663 if (file->f_flags & O_NONBLOCK)
664 return -EAGAIN;
665
666 ret = wait_event_interruptible(fh->wait_poll,
667 !kfifo_is_empty(&fh->scancodes) ||
668 !rcdev->registered);
669 if (ret)
670 return ret;
671 }
672
673 if (!rcdev->registered)
674 return -ENODEV;
675
676 ret = mutex_lock_interruptible(&rcdev->lock);
677 if (ret)
678 return ret;
679 ret = kfifo_to_user(&fh->scancodes, buffer, length, &copied);
680 mutex_unlock(&rcdev->lock);
681 if (ret)
682 return ret;
683 } while (copied == 0);
684
685 return copied;
686 }
687
lirc_read(struct file * file,char __user * buffer,size_t length,loff_t * ppos)688 static ssize_t lirc_read(struct file *file, char __user *buffer, size_t length,
689 loff_t *ppos)
690 {
691 struct lirc_fh *fh = file->private_data;
692 struct rc_dev *rcdev = fh->rc;
693
694 if (rcdev->driver_type == RC_DRIVER_IR_RAW_TX)
695 return -EINVAL;
696
697 if (!rcdev->registered)
698 return -ENODEV;
699
700 if (fh->rec_mode == LIRC_MODE_MODE2)
701 return lirc_read_mode2(file, buffer, length);
702 else /* LIRC_MODE_SCANCODE */
703 return lirc_read_scancode(file, buffer, length);
704 }
705
706 static const struct file_operations lirc_fops = {
707 .owner = THIS_MODULE,
708 .write = lirc_transmit,
709 .unlocked_ioctl = lirc_ioctl,
710 .compat_ioctl = compat_ptr_ioctl,
711 .read = lirc_read,
712 .poll = lirc_poll,
713 .open = lirc_open,
714 .release = lirc_close,
715 .llseek = no_llseek,
716 };
717
lirc_release_device(struct device * ld)718 static void lirc_release_device(struct device *ld)
719 {
720 struct rc_dev *rcdev = container_of(ld, struct rc_dev, lirc_dev);
721
722 put_device(&rcdev->dev);
723 }
724
lirc_register(struct rc_dev * dev)725 int lirc_register(struct rc_dev *dev)
726 {
727 const char *rx_type, *tx_type;
728 int err, minor;
729
730 minor = ida_simple_get(&lirc_ida, 0, RC_DEV_MAX, GFP_KERNEL);
731 if (minor < 0)
732 return minor;
733
734 device_initialize(&dev->lirc_dev);
735 dev->lirc_dev.class = lirc_class;
736 dev->lirc_dev.parent = &dev->dev;
737 dev->lirc_dev.release = lirc_release_device;
738 dev->lirc_dev.devt = MKDEV(MAJOR(lirc_base_dev), minor);
739 dev_set_name(&dev->lirc_dev, "lirc%d", minor);
740
741 INIT_LIST_HEAD(&dev->lirc_fh);
742 spin_lock_init(&dev->lirc_fh_lock);
743
744 cdev_init(&dev->lirc_cdev, &lirc_fops);
745
746 err = cdev_device_add(&dev->lirc_cdev, &dev->lirc_dev);
747 if (err)
748 goto out_ida;
749
750 get_device(&dev->dev);
751
752 switch (dev->driver_type) {
753 case RC_DRIVER_SCANCODE:
754 rx_type = "scancode";
755 break;
756 case RC_DRIVER_IR_RAW:
757 rx_type = "raw IR";
758 break;
759 default:
760 rx_type = "no";
761 break;
762 }
763
764 if (dev->tx_ir)
765 tx_type = "raw IR";
766 else
767 tx_type = "no";
768
769 dev_info(&dev->dev, "lirc_dev: driver %s registered at minor = %d, %s receiver, %s transmitter",
770 dev->driver_name, minor, rx_type, tx_type);
771
772 return 0;
773
774 out_ida:
775 ida_simple_remove(&lirc_ida, minor);
776 return err;
777 }
778
lirc_unregister(struct rc_dev * dev)779 void lirc_unregister(struct rc_dev *dev)
780 {
781 unsigned long flags;
782 struct lirc_fh *fh;
783
784 dev_dbg(&dev->dev, "lirc_dev: driver %s unregistered from minor = %d\n",
785 dev->driver_name, MINOR(dev->lirc_dev.devt));
786
787 spin_lock_irqsave(&dev->lirc_fh_lock, flags);
788 list_for_each_entry(fh, &dev->lirc_fh, list)
789 wake_up_poll(&fh->wait_poll, EPOLLHUP | EPOLLERR);
790 spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
791
792 cdev_device_del(&dev->lirc_cdev, &dev->lirc_dev);
793 ida_simple_remove(&lirc_ida, MINOR(dev->lirc_dev.devt));
794 }
795
lirc_dev_init(void)796 int __init lirc_dev_init(void)
797 {
798 int retval;
799
800 lirc_class = class_create(THIS_MODULE, "lirc");
801 if (IS_ERR(lirc_class)) {
802 pr_err("class_create failed\n");
803 return PTR_ERR(lirc_class);
804 }
805
806 retval = alloc_chrdev_region(&lirc_base_dev, 0, RC_DEV_MAX, "lirc");
807 if (retval) {
808 class_destroy(lirc_class);
809 pr_err("alloc_chrdev_region failed\n");
810 return retval;
811 }
812
813 pr_debug("IR Remote Control driver registered, major %d\n",
814 MAJOR(lirc_base_dev));
815
816 return 0;
817 }
818
lirc_dev_exit(void)819 void __exit lirc_dev_exit(void)
820 {
821 class_destroy(lirc_class);
822 unregister_chrdev_region(lirc_base_dev, RC_DEV_MAX);
823 }
824
rc_dev_get_from_fd(int fd)825 struct rc_dev *rc_dev_get_from_fd(int fd)
826 {
827 struct fd f = fdget(fd);
828 struct lirc_fh *fh;
829 struct rc_dev *dev;
830
831 if (!f.file)
832 return ERR_PTR(-EBADF);
833
834 if (f.file->f_op != &lirc_fops) {
835 fdput(f);
836 return ERR_PTR(-EINVAL);
837 }
838
839 fh = f.file->private_data;
840 dev = fh->rc;
841
842 get_device(&dev->dev);
843 fdput(f);
844
845 return dev;
846 }
847
848 MODULE_ALIAS("lirc_dev");
849
