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Diffstat (limited to 'Documentation/userspace-api/media/dvb/ca-set-descr.rst')
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diff --git a/Documentation/userspace-api/media/dvb/ca-set-descr.rst b/Documentation/userspace-api/media/dvb/ca-set-descr.rst new file mode 100644 index 000000000000..2c57371675e2 --- /dev/null +++ b/Documentation/userspace-api/media/dvb/ca-set-descr.rst @@ -0,0 +1,53 @@ +.. Permission is granted to copy, distribute and/or modify this +.. document under the terms of the GNU Free Documentation License, +.. Version 1.1 or any later version published by the Free Software +.. Foundation, with no Invariant Sections, no Front-Cover Texts +.. and no Back-Cover Texts. A copy of the license is included at +.. Documentation/userspace-api/media/fdl-appendix.rst. +.. +.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections + +.. _CA_SET_DESCR: + +============ +CA_SET_DESCR +============ + +Name +---- + +CA_SET_DESCR + + +Synopsis +-------- + +.. c:function:: int ioctl(fd, CA_SET_DESCR, struct ca_descr *desc) + :name: CA_SET_DESCR + + +Arguments +--------- + +``fd`` + File descriptor returned by a previous call to :c:func:`open() <cec-open>`. + +``msg`` + Pointer to struct :c:type:`ca_descr`. + +Description +----------- + +CA_SET_DESCR is used for feeding descrambler CA slots with descrambling +keys (referred as control words). + +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. |