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-status.rst | 65 +++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 Documentation/media/uapi/dvb/fe-read-status.rst (limited to 'Documentation/media/uapi/dvb/fe-read-status.rst') diff --git a/Documentation/media/uapi/dvb/fe-read-status.rst b/Documentation/media/uapi/dvb/fe-read-status.rst new file mode 100644 index 000000000..4adb52f08 --- /dev/null +++ b/Documentation/media/uapi/dvb/fe-read-status.rst @@ -0,0 +1,65 @@ +.. -*- coding: utf-8; mode: rst -*- + +.. _FE_READ_STATUS: + +******************** +ioctl FE_READ_STATUS +******************** + +Name +==== + +FE_READ_STATUS - Returns status information about the front-end. This call only requires - read-only access to the device + + +Synopsis +======== + +.. c:function:: int ioctl( int fd, FE_READ_STATUS, unsigned int *status ) + :name: FE_READ_STATUS + + +Arguments +========= + +``fd`` + File descriptor returned by :ref:`open() `. + +``status`` + pointer to a bitmask integer filled with the values defined by enum + :c:type:`fe_status`. + + +Description +=========== + +All Digital TV frontend devices support the ``FE_READ_STATUS`` ioctl. It is +used to check about the locking status of the frontend after being +tuned. The ioctl takes a pointer to an integer where the status will be +written. + +.. note:: + + The size of status is actually sizeof(enum fe_status), with + varies according with the architecture. This needs to be fixed in the + future. + + +int fe_status +============= + +The fe_status parameter is used to indicate the current state and/or +state changes of the frontend hardware. It is produced using the enum +:c:type:`fe_status` values on a bitmask + + +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