Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) .. c:namespace:: DTV.fe
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) .. _FE_READ_STATUS:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) ********************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) ioctl FE_READ_STATUS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) ********************
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) Name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) ====
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) FE_READ_STATUS - Returns status information about the front-end. This call only requires - read-only access to the device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) Synopsis
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) ========
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) .. c:macro:: FE_READ_STATUS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) ``int ioctl(int fd, FE_READ_STATUS, unsigned int *status)``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) Arguments
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) =========
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) ``fd``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)     File descriptor returned by :c:func:`open()`.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) ``status``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)     pointer to a bitmask integer filled with the values defined by enum
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)     :c:type:`fe_status`.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) Description
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) ===========
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) All Digital TV frontend devices support the ``FE_READ_STATUS`` ioctl. It is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) used to check about the locking status of the frontend after being
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) tuned. The ioctl takes a pointer to an integer where the status will be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) written.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) .. note::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)    The size of status is actually sizeof(enum fe_status), with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)    varies according with the architecture. This needs to be fixed in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)    future.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) int fe_status
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) =============
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) The fe_status parameter is used to indicate the current state and/or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) state changes of the frontend hardware. It is produced using the enum
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) :c:type:`fe_status` values on a bitmask
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) Return Value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) ============
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) On success 0 is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) On error -1 is returned, and the ``errno`` variable is set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) appropriately.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) Generic error codes are described at the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) :ref:`Generic Error Codes <gen-errors>` chapter.