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Diffstat (limited to 'Documentation/linux_tv/media/v4l/lirc_dev_intro.rst')
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diff --git a/Documentation/linux_tv/media/v4l/lirc_dev_intro.rst b/Documentation/linux_tv/media/v4l/lirc_dev_intro.rst new file mode 100644 index 000000000000..10d4d9a96b15 --- /dev/null +++ b/Documentation/linux_tv/media/v4l/lirc_dev_intro.rst @@ -0,0 +1,37 @@ +.. -*- coding: utf-8; mode: rst -*- + +.. _lirc_dev_intro: + +************ +Introduction +************ + +The LIRC device interface is a bi-directional interface for transporting +raw IR data between userspace and kernelspace. Fundamentally, it is just +a chardev (/dev/lircX, for X = 0, 1, 2, ...), with a number of standard +struct file_operations defined on it. With respect to transporting raw +IR data to and fro, the essential fops are read, write and ioctl. + +Example dmesg output upon a driver registering w/LIRC: + + $ dmesg |grep lirc_dev + + lirc_dev: IR Remote Control driver registered, major 248 + + rc rc0: lirc_dev: driver ir-lirc-codec (mceusb) registered at minor + = 0 + +What you should see for a chardev: + + $ ls -l /dev/lirc* + + crw-rw---- 1 root root 248, 0 Jul 2 22:20 /dev/lirc0 + + +.. ------------------------------------------------------------------------------ +.. This file was automatically converted from DocBook-XML with the dbxml +.. library (https://github.com/return42/sphkerneldoc). The origin XML comes +.. from the linux kernel, refer to: +.. +.. * https://github.com/torvalds/linux/tree/master/Documentation/DocBook +.. ------------------------------------------------------------------------------ |