mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-16 07:35:14 +00:00
60c2820d0f
The name of the subsystem is "media", and not "linux_tv". Also, as we plan to add other stuff there in the future, let's rename also the media uAPI book to media_uapi, to make it clearer. No functional changes. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
46 lines
1.1 KiB
ReStructuredText
46 lines
1.1 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
|
|
|
|
.. _VIDIOC_LOG_STATUS:
|
|
|
|
***********************
|
|
ioctl VIDIOC_LOG_STATUS
|
|
***********************
|
|
|
|
Name
|
|
====
|
|
|
|
VIDIOC_LOG_STATUS - Log driver status information
|
|
|
|
|
|
Synopsis
|
|
========
|
|
|
|
.. cpp:function:: int ioctl( int fd, int request )
|
|
|
|
|
|
Arguments
|
|
=========
|
|
|
|
|
|
|
|
Description
|
|
===========
|
|
|
|
As the video/audio devices become more complicated it becomes harder to
|
|
debug problems. When this ioctl is called the driver will output the
|
|
current device status to the kernel log. This is particular useful when
|
|
dealing with problems like no sound, no video and incorrectly tuned
|
|
channels. Also many modern devices autodetect video and audio standards
|
|
and this ioctl will report what the device thinks what the standard is.
|
|
Mismatches may give an indication where the problem is.
|
|
|
|
This ioctl is optional and not all drivers support it. It was introduced
|
|
in Linux 2.6.15.
|
|
|
|
|
|
Return Value
|
|
============
|
|
|
|
On success 0 is returned, on error -1 and the ``errno`` variable is set
|
|
appropriately. The generic error codes are described at the
|
|
:ref:`Generic Error Codes <gen-errors>` chapter.
|