mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 19:53:59 +08:00
f9b2e8aa32
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>
76 lines
1.8 KiB
ReStructuredText
76 lines
1.8 KiB
ReStructuredText
.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
|
|
.. c:namespace:: DTV.fe
|
|
|
|
.. _FE_GET_PROPERTY:
|
|
|
|
**************************************
|
|
ioctl FE_SET_PROPERTY, FE_GET_PROPERTY
|
|
**************************************
|
|
|
|
Name
|
|
====
|
|
|
|
FE_SET_PROPERTY - FE_GET_PROPERTY - FE_SET_PROPERTY sets one or more frontend properties. - FE_GET_PROPERTY returns one or more frontend properties.
|
|
|
|
Synopsis
|
|
========
|
|
|
|
.. c:macro:: FE_GET_PROPERTY
|
|
|
|
``int ioctl(int fd, FE_GET_PROPERTY, struct dtv_properties *argp)``
|
|
|
|
.. c:macro:: FE_SET_PROPERTY
|
|
|
|
``int ioctl(int fd, FE_SET_PROPERTY, struct dtv_properties *argp)``
|
|
|
|
Arguments
|
|
=========
|
|
|
|
``fd``
|
|
File descriptor returned by :c:func:`open()`.
|
|
|
|
``argp``
|
|
Pointer to struct :c:type:`dtv_properties`.
|
|
|
|
Description
|
|
===========
|
|
|
|
All Digital TV frontend devices support the ``FE_SET_PROPERTY`` and
|
|
``FE_GET_PROPERTY`` ioctls. The supported properties and statistics
|
|
depends on the delivery system and on the device:
|
|
|
|
- ``FE_SET_PROPERTY:``
|
|
|
|
- This ioctl is used to set one or more frontend properties.
|
|
|
|
- This is the basic command to request the frontend to tune into
|
|
some frequency and to start decoding the digital TV signal.
|
|
|
|
- This call requires read/write access to the device.
|
|
|
|
.. note::
|
|
|
|
At return, the values aren't updated to reflect the actual
|
|
parameters used. If the actual parameters are needed, an explicit
|
|
call to ``FE_GET_PROPERTY`` is needed.
|
|
|
|
- ``FE_GET_PROPERTY:``
|
|
|
|
- This ioctl is used to get properties and statistics from the
|
|
frontend.
|
|
|
|
- No properties are changed, and statistics aren't reset.
|
|
|
|
- This call only requires read-only access to the device.
|
|
|
|
Return Value
|
|
============
|
|
|
|
On success 0 is returned.
|
|
|
|
On error -1 is returned, and the ``errno`` variable is set
|
|
appropriately.
|
|
|
|
Generic error codes are described at the
|
|
:ref:`Generic Error Codes <gen-errors>` chapter.
|