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Diffstat (limited to 'Documentation/media/uapi/rc/lirc_dev_intro.rst')
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diff --git a/Documentation/media/uapi/rc/lirc_dev_intro.rst b/Documentation/media/uapi/rc/lirc_dev_intro.rst new file mode 100644 index 0000000..9a784c8 --- /dev/null +++ b/Documentation/media/uapi/rc/lirc_dev_intro.rst @@ -0,0 +1,28 @@ +.. -*- 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: + +.. code-block:: none + + $ 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: + +.. code-block:: none + + $ ls -l /dev/lirc* + crw-rw---- 1 root root 248, 0 Jul 2 22:20 /dev/lirc0 |