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media: ca docs: document CA_SET_DESCR ioctl and structs
The av7110 driver uses CA_SET_DESCR to store the descrambler control words at the CA descrambler slots. Document it. Thanks-to: Honza Petrouš <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]>
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@ -28,22 +28,11 @@ Arguments
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``msg``
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Pointer to struct :c:type:`ca_descr`.
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.. c:type:: ca_descr
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.. code-block:: c
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struct ca_descr {
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unsigned int index;
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unsigned int parity;
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unsigned char cw[8];
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};
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Description
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-----------
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.. note:: This ioctl is undocumented. Documentation is welcome.
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CA_SET_DESCR is used for feeding descrambler CA slots with descrambling
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keys (refered as control words).
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Return Value
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------------
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