Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 76 insertions, 0 deletions

diff --git a/Documentation/media/uapi/dvb/fe-get-property.rst b/Documentation/media/uapi/dvb/fe-get-property.rst
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+.. -*- coding: utf-8; mode: rst -*-
+
+.. _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:function:: int ioctl( int fd, FE_GET_PROPERTY, struct dtv_properties *argp )
+    :name: FE_GET_PROPERTY
+
+.. c:function:: int ioctl( int fd, FE_SET_PROPERTY, struct dtv_properties *argp )
+    :name: FE_SET_PROPERTY
+
+
+Arguments
+=========
+
+``fd``
+    File descriptor returned by :ref:`open() <frontend_f_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.