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media: ca-get-descr-info.rst: document this ioctl

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Instead of a generic boilerplate, fill it with relevant
information about this ioctl.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2017-09-01 08:39:43 -04:00
parent 5d153fb888
commit e0f891d846
1 changed files with 4 additions and 25 deletions
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29
Documentation/media/uapi/dvb/ca-get-descr-info.rst
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@ -27,37 +27,16 @@ Arguments
``desc``
Pointer to struct :c:type:`ca_descr_info`.
.. c:type:: struct ca_descr_info
.. flat-table:: struct ca_descr_info
:header-rows: 1
:stub-columns: 0
-
- type
- name
- description
-
- unsigned int
- num
- number of available descramblers (keys)
-
- unsigned int
- type
- type of supported scrambling system. Valid values are:
``CA_ECD``, ``CA_NDS`` and ``CA_DSS``.
Description
-----------
.. note:: This ioctl is undocumented. Documentation is welcome.
Returns information about all descrambler slots.
Return Value
------------
On success 0 is returned, on error -1 and the ``errno`` variable is set
On success 0 is returned, and :c:type:`ca_descr_info` is filled.
On error -1 is returned, and the ``errno`` variable is set
appropriately. The generic error codes are described at the
:ref:`Generic Error Codes <gen-errors>` chapter.