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.ca
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) .. _ca_fopen:
^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) Digital TV CA open()
^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) Digital TV CA open()
^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:function:: int open(const char *name, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) Arguments
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) ---------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) ``name``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)   Name of specific Digital TV CA device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) ``flags``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)   A bit-wise OR of the following flags:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) .. tabularcolumns:: |p{2.5cm}|p{15.0cm}|
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) .. flat-table::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)     :header-rows:  0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)     :stub-columns: 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)     :widths: 1 16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)     -  - ``O_RDONLY``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)        - read-only access
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)     -  - ``O_RDWR``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)        - read/write access
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)     -  - ``O_NONBLOCK``
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)        - open in non-blocking mode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)          (blocking mode is the default)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) Description
^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) This system call opens a named ca device (e.g. ``/dev/dvb/adapter?/ca?``)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) for subsequent use.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) When an ``open()`` call has succeeded, the device will be ready for use. The
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) significance of blocking or non-blocking mode is described in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) documentation for functions where there is a difference. It does not
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) affect the semantics of the ``open()`` call itself. A device opened in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) blocking mode can later be put into non-blocking mode (and vice versa)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) using the ``F_SETFL`` command of the ``fcntl`` system call. This is a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) standard system call, documented in the Linux manual page for fcntl.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) Only one user can open the CA Device in ``O_RDWR`` mode. All other
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) attempts to open the device in this mode will fail, and an error code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) will be returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) Return Value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) ------------
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) On success 0 is returned.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) On error -1 is returned, and the ``errno`` variable is set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) appropriately.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) Generic error codes are described at the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) :ref:`Generic Error Codes <gen-errors>` chapter.