From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- Documentation/media/uapi/dvb/fe-read-snr.rst | 50 ++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 Documentation/media/uapi/dvb/fe-read-snr.rst (limited to 'Documentation/media/uapi/dvb/fe-read-snr.rst') diff --git a/Documentation/media/uapi/dvb/fe-read-snr.rst b/Documentation/media/uapi/dvb/fe-read-snr.rst new file mode 100644 index 000000000..6db22c043 --- /dev/null +++ b/Documentation/media/uapi/dvb/fe-read-snr.rst @@ -0,0 +1,50 @@ +.. -*- coding: utf-8; mode: rst -*- + +.. _FE_READ_SNR: + +*********** +FE_READ_SNR +*********** + +Name +==== + +FE_READ_SNR + +.. attention:: This ioctl is deprecated. + +Synopsis +======== + +.. c:function:: int ioctl(int fd, FE_READ_SNR, int16_t *snr) + :name: FE_READ_SNR + + +Arguments +========= + +``fd`` + File descriptor returned by :c:func:`open() `. + +``snr`` + The signal-to-noise ratio is stored into \*snr. + + +Description +=========== + +This ioctl call returns the signal-to-noise ratio 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 ` chapter. -- cgit v1.2.3