Adding upstream version 4.19.249.upstream/4.19.249

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

1 files changed, 50 insertions, 0 deletions

diff --git a/Documentation/media/uapi/dvb/fe-read-signal-strength.rst b/Documentation/media/uapi/dvb/fe-read-signal-strength.rst
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+.. -*- coding: utf-8; mode: rst -*-
+
+.. _FE_READ_SIGNAL_STRENGTH:
+
+***********************
+FE_READ_SIGNAL_STRENGTH
+***********************
+
+Name
+====
+
+FE_READ_SIGNAL_STRENGTH
+
+.. attention:: This ioctl is deprecated.
+
+Synopsis
+========
+
+.. c:function:: int ioctl( int fd, FE_READ_SIGNAL_STRENGTH, uint16_t *strength)
+    :name: FE_READ_SIGNAL_STRENGTH
+
+
+Arguments
+=========
+
+``fd``
+    File descriptor returned by :c:func:`open() <dvb-fe-open>`.
+
+``strength``
+    The signal strength value is stored into \*strength.
+
+
+Description
+===========
+
+This ioctl call returns the signal strength value for the signal
+currently received by the front-end. For this command, read-only access
+to the device is sufficient.
+
+
+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.