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media: lirc: implement reading scancode

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This implements LIRC_MODE_SCANCODE reading from the lirc device. The
scancode can be read from the input device too, but with this interface
you get the rc protocol, keycode, toggle and repeat status in addition
to just the scancode.

int main()
{
	int fd, mode, rc;
	fd = open("/dev/lirc0", O_RDWR);

	mode = LIRC_MODE_SCANCODE;
	if (ioctl(fd, LIRC_SET_REC_MODE, &mode)) {
		// kernel too old or lirc does not support transmit
	}
	struct lirc_scancode scancode;
	while (read(fd, &scancode, sizeof(scancode)) == sizeof(scancode)) {
		printf("protocol:%d scancode:0x%x toggle:%d repeat:%d\n",
			scancode.rc_proto, scancode.scancode,
			!!(scancode.flags & LIRC_SCANCODE_FLAG_TOGGLE),
			!!(scancode.flags & LIRC_SCANCODE_FLAG_REPEAT));
	}
	close(fd);
}

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Sean Young 2017-02-25 06:51:32 -05:00 • committed by Mauro Carvalho Chehab
parent a6ddd4fecb
commit de142c3241
6 changed files with 122 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

13
drivers/media/rc/lirc_dev.c
View file

@ -42,6 +42,8 @@ static void lirc_release_device(struct device *ld)
if (rcdev->driver_type == RC_DRIVER_IR_RAW)
kfifo_free(&rcdev->rawir);
if (rcdev->driver_type != RC_DRIVER_IR_RAW_TX)
kfifo_free(&rcdev->scancodes);
put_device(&rcdev->dev);
}
@ -55,11 +57,20 @@ int ir_lirc_register(struct rc_dev *dev)
dev->lirc_dev.release = lirc_release_device;
dev->send_mode = LIRC_MODE_PULSE;
dev->rec_mode = LIRC_MODE_MODE2;
if (dev->driver_type == RC_DRIVER_IR_RAW) {
if (kfifo_alloc(&dev->rawir, MAX_IR_EVENT_SIZE, GFP_KERNEL))
return -ENOMEM;
}
if (dev->driver_type != RC_DRIVER_IR_RAW_TX) {
if (kfifo_alloc(&dev->scancodes, 32, GFP_KERNEL)) {
kfifo_free(&dev->rawir);
return -ENOMEM;
}
}
init_waitqueue_head(&dev->wait_poll);
minor = ida_simple_get(&lirc_ida, 0, RC_DEV_MAX, GFP_KERNEL);
@ -90,6 +101,8 @@ out_ida:
out_kfifo:
if (dev->driver_type == RC_DRIVER_IR_RAW)
kfifo_free(&dev->rawir);
if (dev->driver_type != RC_DRIVER_IR_RAW_TX)
kfifo_free(&dev->scancodes);
return err;
}