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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>
69 lines
1.6 KiB
ReStructuredText
69 lines
1.6 KiB
ReStructuredText
.. -*- coding: utf-8; mode: rst -*-
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.. _FE_GET_PROPERTY:
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**************************************
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ioctl FE_SET_PROPERTY, FE_GET_PROPERTY
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**************************************
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Name
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====
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FE_SET_PROPERTY - FE_GET_PROPERTY - FE_SET_PROPERTY sets one or more frontend properties. - FE_GET_PROPERTY returns one or more frontend properties.
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Synopsis
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========
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.. cpp:function:: int ioctl( int fd, int request, struct dtv_properties *argp )
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Arguments
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=========
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``fd``
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File descriptor returned by :ref:`open() <frontend_f_open>`.
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``request``
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FE_SET_PROPERTY, FE_GET_PROPERTY
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``argp``
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pointer to struct :ref:`dtv_properties <dtv-properties>`
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Description
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===========
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All DVB frontend devices support the ``FE_SET_PROPERTY`` and
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``FE_GET_PROPERTY`` ioctls. The supported properties and statistics
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depends on the delivery system and on the device:
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- ``FE_SET_PROPERTY:``
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- This ioctl is used to set one or more frontend properties.
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- This is the basic command to request the frontend to tune into
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some frequency and to start decoding the digital TV signal.
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- This call requires read/write access to the device.
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- At return, the values are updated to reflect the actual parameters
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used.
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- ``FE_GET_PROPERTY:``
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- This ioctl is used to get properties and statistics from the
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frontend.
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- No properties are changed, and statistics aren't reset.
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- This call only requires read-only access to the device.
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Return Value
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============
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On success 0 is returned, on error -1 and the ``errno`` variable is set
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appropriately. The generic error codes are described at the
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:ref:`Generic Error Codes <gen-errors>` chapter.
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