mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-15 15:15:47 +00:00
407e84cd1e
Sphinx 3.x broke support for the cdomain.py extension, as the c domain code was rewritten. Due to that, the c tags need to be re-written, in order to use the new c domain notation. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
47 lines
1.2 KiB
ReStructuredText
47 lines
1.2 KiB
ReStructuredText
.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
|
|
.. c:namespace:: V4L
|
|
|
|
.. _VIDIOC_LOG_STATUS:
|
|
|
|
***********************
|
|
ioctl VIDIOC_LOG_STATUS
|
|
***********************
|
|
|
|
Name
|
|
====
|
|
|
|
VIDIOC_LOG_STATUS - Log driver status information
|
|
|
|
Synopsis
|
|
========
|
|
|
|
.. c:macro:: VIDIOC_LOG_STATUS
|
|
|
|
``int ioctl(int fd, VIDIOC_LOG_STATUS)``
|
|
|
|
Arguments
|
|
=========
|
|
|
|
``fd``
|
|
File descriptor returned by :c:func:`open()`.
|
|
|
|
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.
|