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2024-05-13 9d77db3c730780c8ef5ccd4b66403ff5675cfe4e 
 kernel/drivers/media/rc/lirc_dev.c
....@@ -1,18 +1,8 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * LIRC base driver
34  *
45  * by Artur Lipowski <alipowski@interia.pl>
5
- *
6
- *  This program is free software; you can redistribute it and/or modify
7
- *  it under the terms of the GNU General Public License as published by
8
- *  the Free Software Foundation; either version 2 of the License, or
9
- *  (at your option) any later version.
10
- *
11
- *  This program is distributed in the hope that it will be useful,
12
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
13
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14
- *  GNU General Public License for more details.
15
- *
166  */
177 
188 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
....@@ -40,12 +30,12 @@
4030 static struct class *lirc_class;
4131 
4232 /**
43
- * ir_lirc_raw_event() - Send raw IR data to lirc to be relayed to userspace
33
+ * lirc_raw_event() - Send raw IR data to lirc to be relayed to userspace
4434  *
4535  * @dev:	the struct rc_dev descriptor of the device
4636  * @ev:		the struct ir_raw_event descriptor of the pulse/space
4737  */
48
-void ir_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)
4939 {
5040 	unsigned long flags;
5141 	struct lirc_fh *fh;
....@@ -77,17 +67,16 @@
7767 		dev->gap = true;
7868 		dev->gap_duration = ev.duration;
7969 
80
-		sample = LIRC_TIMEOUT(ev.duration / 1000);
70
+		sample = LIRC_TIMEOUT(ev.duration);
8171 		dev_dbg(&dev->dev, "timeout report (duration: %d)\n", sample);
8272 
8373 	/* Normal sample */
8474 	} else {
8575 		if (dev->gap) {
86
-			dev->gap_duration += ktime_to_ns(ktime_sub(ktime_get(),
76
+			dev->gap_duration += ktime_to_us(ktime_sub(ktime_get(),
8777 							 dev->gap_start));
8878 
89
-			/* Convert to ms and cap by LIRC_VALUE_MASK */
90
-			do_div(dev->gap_duration, 1000);
79
+			/* Cap by LIRC_VALUE_MASK */
9180 			dev->gap_duration = min_t(u64, dev->gap_duration,
9281 						  LIRC_VALUE_MASK);
9382 
....@@ -99,10 +88,10 @@
9988 			dev->gap = false;
10089 		}
10190 
102
-		sample = ev.pulse ? LIRC_PULSE(ev.duration / 1000) :
103
-					LIRC_SPACE(ev.duration / 1000);
91
+		sample = ev.pulse ? LIRC_PULSE(ev.duration) :
92
+					LIRC_SPACE(ev.duration);
10493 		dev_dbg(&dev->dev, "delivering %uus %s to lirc_dev\n",
105
-			TO_US(ev.duration), TO_STR(ev.pulse));
94
+			ev.duration, TO_STR(ev.pulse));
10695 	}
10796 
10897 	/*
....@@ -122,12 +111,12 @@
122111 }
123112 
124113 /**
125
- * ir_lirc_scancode_event() - Send scancode data to lirc to be relayed to
114
+ * lirc_scancode_event() - Send scancode data to lirc to be relayed to
126115  *		userspace. This can be called in atomic context.
127116  * @dev:	the struct rc_dev descriptor of the device
128117  * @lsc:	the struct lirc_scancode describing the decoded scancode
129118  */
130
-void ir_lirc_scancode_event(struct rc_dev *dev, struct lirc_scancode *lsc)
119
+void lirc_scancode_event(struct rc_dev *dev, struct lirc_scancode *lsc)
131120 {
132121 	unsigned long flags;
133122 	struct lirc_fh *fh;
....@@ -141,9 +130,9 @@
141130 	}
142131 	spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
143132 }
144
-EXPORT_SYMBOL_GPL(ir_lirc_scancode_event);
133
+EXPORT_SYMBOL_GPL(lirc_scancode_event);
145134 
146
-static int ir_lirc_open(struct inode *inode, struct file *file)
135
+static int lirc_open(struct inode *inode, struct file *file)
147136 {
148137 	struct rc_dev *dev = container_of(inode->i_cdev, struct rc_dev,
149138 					  lirc_cdev);
....@@ -195,7 +184,7 @@
195184 	list_add(&fh->list, &dev->lirc_fh);
196185 	spin_unlock_irqrestore(&dev->lirc_fh_lock, flags);
197186 
198
-	nonseekable_open(inode, file);
187
+	stream_open(inode, file);
199188 
200189 	return 0;
201190 out_kfifo:
....@@ -211,7 +200,7 @@
211200 	return retval;
212201 }
213202 
214
-static int ir_lirc_close(struct inode *inode, struct file *file)
203
+static int lirc_close(struct inode *inode, struct file *file)
215204 {
216205 	struct lirc_fh *fh = file->private_data;
217206 	struct rc_dev *dev = fh->rc;
....@@ -233,8 +222,8 @@
233222 	return 0;
234223 }
235224 
236
-static ssize_t ir_lirc_transmit_ir(struct file *file, const char __user *buf,
237
-				   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)
238227 {
239228 	struct lirc_fh *fh = file->private_data;
240229 	struct rc_dev *dev = fh->rc;
....@@ -279,12 +268,7 @@
279268 			goto out_unlock;
280269 		}
281270 
282
-		/*
283
-		 * The scancode field in lirc_scancode is 64-bit simply
284
-		 * to future-proof it, since there are IR protocols encode
285
-		 * use more than 32 bits. For now only 32-bit protocols
286
-		 * are supported.
287
-		 */
271
+		/* We only have encoders for 32-bit protocols. */
288272 		if (scan.scancode > U32_MAX ||
289273 		    !rc_validate_scancode(scan.rc_proto, scan.scancode)) {
290274 			ret = -EINVAL;
....@@ -311,8 +295,7 @@
311295 		}
312296 
313297 		for (i = 0; i < count; i++)
314
-			/* Convert from NS to US */
315
-			txbuf[i] = DIV_ROUND_UP(raw[i].duration, 1000);
298
+			txbuf[i] = raw[i].duration;
316299 
317300 		if (dev->s_tx_carrier) {
318301 			int carrier = ir_raw_encode_carrier(scan.rc_proto);
....@@ -340,7 +323,7 @@
340323 	}
341324 
342325 	for (i = 0; i < count; i++) {
343
-		if (txbuf[i] > IR_MAX_DURATION / 1000 - duration || !txbuf[i]) {
326
+		if (txbuf[i] > IR_MAX_DURATION - duration || !txbuf[i]) {
344327 			ret = -EINVAL;
345328 			goto out_kfree;
346329 		}
....@@ -380,8 +363,7 @@
380363 	return ret;
381364 }
382365 
383
-static long ir_lirc_ioctl(struct file *file, unsigned int cmd,
384
-			  unsigned long arg)
366
+static long lirc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
385367 {
386368 	struct lirc_fh *fh = file->private_data;
387369 	struct rc_dev *dev = fh->rc;
....@@ -532,7 +514,7 @@
532514 		if (!dev->rx_resolution)
533515 			ret = -ENOTTY;
534516 		else
535
-			val = dev->rx_resolution / 1000;
517
+			val = dev->rx_resolution;
536518 		break;
537519 
538520 	case LIRC_SET_WIDEBAND_RECEIVER:
....@@ -554,31 +536,26 @@
554536 		if (!dev->max_timeout)
555537 			ret = -ENOTTY;
556538 		else
557
-			val = DIV_ROUND_UP(dev->min_timeout, 1000);
539
+			val = dev->min_timeout;
558540 		break;
559541 
560542 	case LIRC_GET_MAX_TIMEOUT:
561543 		if (!dev->max_timeout)
562544 			ret = -ENOTTY;
563545 		else
564
-			val = dev->max_timeout / 1000;
546
+			val = dev->max_timeout;
565547 		break;
566548 
567549 	case LIRC_SET_REC_TIMEOUT:
568550 		if (!dev->max_timeout) {
569551 			ret = -ENOTTY;
570
-		} else if (val > U32_MAX / 1000) {
571
-			/* Check for multiply overflow */
572
-			ret = -EINVAL;
573552 		} else {
574
-			u32 tmp = val * 1000;
575
-
576
-			if (tmp < dev->min_timeout || tmp > dev->max_timeout)
553
+			if (val < dev->min_timeout || val > dev->max_timeout)
577554 				ret = -EINVAL;
578555 			else if (dev->s_timeout)
579
-				ret = dev->s_timeout(dev, tmp);
556
+				ret = dev->s_timeout(dev, val);
580557 			else
581
-				dev->timeout = tmp;
558
+				dev->timeout = val;
582559 		}
583560 		break;
584561 
....@@ -586,7 +563,7 @@
586563 		if (!dev->timeout)
587564 			ret = -ENOTTY;
588565 		else
589
-			val = DIV_ROUND_UP(dev->timeout, 1000);
566
+			val = dev->timeout;
590567 		break;
591568 
592569 	case LIRC_SET_REC_TIMEOUT_REPORTS:
....@@ -608,7 +585,7 @@
608585 	return ret;
609586 }
610587 
611
-static __poll_t ir_lirc_poll(struct file *file, struct poll_table_struct *wait)
588
+static __poll_t lirc_poll(struct file *file, struct poll_table_struct *wait)
612589 {
613590 	struct lirc_fh *fh = file->private_data;
614591 	struct rc_dev *rcdev = fh->rc;
....@@ -631,8 +608,8 @@
631608 	return events;
632609 }
633610 
634
-static ssize_t ir_lirc_read_mode2(struct file *file, char __user *buffer,
635
-				  size_t length)
611
+static ssize_t lirc_read_mode2(struct file *file, char __user *buffer,
612
+			       size_t length)
636613 {
637614 	struct lirc_fh *fh = file->private_data;
638615 	struct rc_dev *rcdev = fh->rc;
....@@ -669,8 +646,8 @@
669646 	return copied;
670647 }
671648 
672
-static ssize_t ir_lirc_read_scancode(struct file *file, char __user *buffer,
673
-				     size_t length)
649
+static ssize_t lirc_read_scancode(struct file *file, char __user *buffer,
650
+				  size_t length)
674651 {
675652 	struct lirc_fh *fh = file->private_data;
676653 	struct rc_dev *rcdev = fh->rc;
....@@ -708,8 +685,8 @@
708685 	return copied;
709686 }
710687 
711
-static ssize_t ir_lirc_read(struct file *file, char __user *buffer,
712
-			    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)
713690 {
714691 	struct lirc_fh *fh = file->private_data;
715692 	struct rc_dev *rcdev = fh->rc;
....@@ -721,22 +698,20 @@
721698 		return -ENODEV;
722699 
723700 	if (fh->rec_mode == LIRC_MODE_MODE2)
724
-		return ir_lirc_read_mode2(file, buffer, length);
701
+		return lirc_read_mode2(file, buffer, length);
725702 	else /* LIRC_MODE_SCANCODE */
726
-		return ir_lirc_read_scancode(file, buffer, length);
703
+		return lirc_read_scancode(file, buffer, length);
727704 }
728705 
729706 static const struct file_operations lirc_fops = {
730707 	.owner		= THIS_MODULE,
731
-	.write		= ir_lirc_transmit_ir,
732
-	.unlocked_ioctl	= ir_lirc_ioctl,
733
-#ifdef CONFIG_COMPAT
734
-	.compat_ioctl	= ir_lirc_ioctl,
735
-#endif
736
-	.read		= ir_lirc_read,
737
-	.poll		= ir_lirc_poll,
738
-	.open		= ir_lirc_open,
739
-	.release	= ir_lirc_close,
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,
740715 	.llseek		= no_llseek,
741716 };
742717 
....@@ -747,7 +722,7 @@
747722 	put_device(&rcdev->dev);
748723 }
749724 
750
-int ir_lirc_register(struct rc_dev *dev)
725
+int lirc_register(struct rc_dev *dev)
751726 {
752727 	const char *rx_type, *tx_type;
753728 	int err, minor;
....@@ -801,7 +776,7 @@
801776 	return err;
802777 }
803778 
804
-void ir_lirc_unregister(struct rc_dev *dev)
779
+void lirc_unregister(struct rc_dev *dev)
805780 {
806781 	unsigned long flags;
807782 	struct lirc_fh *fh;
....@@ -828,8 +803,7 @@
828803 		return PTR_ERR(lirc_class);
829804 	}
830805 
831
-	retval = alloc_chrdev_region(&lirc_base_dev, 0, RC_DEV_MAX,
832
-				     "BaseRemoteCtl");
806
+	retval = alloc_chrdev_region(&lirc_base_dev, 0, RC_DEV_MAX, "lirc");
833807 	if (retval) {
834808 		class_destroy(lirc_class);
835809 		pr_err("alloc_chrdev_region failed\n");