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| author | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2017-09-04 15:03:40 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2017-09-05 13:23:28 +0300 |
| commit | 7e6854a9bfea9ed6553acd0204da5101c9a2e6a0 (patch) | |
| tree | a9a2a48741c54079d939aba0ba4f0b4e61b5667b | |
| parent | bd9049edc66e13e868f819c39844f60443e70817 (diff) | |
| download | linux-7e6854a9bfea9ed6553acd0204da5101c9a2e6a0.tar.xz | |
media: ca.h: document ca_msg and the corresponding ioctls
Usually, CA messages are sent/received via reading/writing at
the CA device node. However, two drivers (dst_ca and firedtv-ci)
also implement it via ioctls.
Apparently, on both cases, the net result is the same.
Anyway, let's document it.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
| -rw-r--r-- | Documentation/media/uapi/dvb/ca-get-msg.rst | 19 | ||||
| -rw-r--r-- | Documentation/media/uapi/dvb/ca-send-msg.rst | 6 | ||||
| -rw-r--r-- | include/uapi/linux/dvb/ca.h | 11 |
3 files changed, 21 insertions, 15 deletions
diff --git a/Documentation/media/uapi/dvb/ca-get-msg.rst b/Documentation/media/uapi/dvb/ca-get-msg.rst index bdb116552068..ceeda623ce93 100644 --- a/Documentation/media/uapi/dvb/ca-get-msg.rst +++ b/Documentation/media/uapi/dvb/ca-get-msg.rst @@ -28,22 +28,15 @@ Arguments ``msg`` Pointer to struct :c:type:`ca_msg`. -.. c:type:: ca_msg - -.. code-block:: c - - /* a message to/from a CI-CAM */ - struct ca_msg { - unsigned int index; - unsigned int type; - unsigned int length; - unsigned char msg[256]; - }; - Description ----------- -.. note:: This ioctl is undocumented. Documentation is welcome. +Receives a message via a CI CA module. + +.. note:: + + Please notice that, on most drivers, this is done by reading from + the /dev/adapter?/ca? device node. Return Value diff --git a/Documentation/media/uapi/dvb/ca-send-msg.rst b/Documentation/media/uapi/dvb/ca-send-msg.rst index 644b6bda1aea..9e91287b7bbc 100644 --- a/Documentation/media/uapi/dvb/ca-send-msg.rst +++ b/Documentation/media/uapi/dvb/ca-send-msg.rst @@ -32,8 +32,12 @@ Arguments Description ----------- -.. note:: This ioctl is undocumented. Documentation is welcome. +Sends a message via a CI CA module. +.. note:: + + Please notice that, on most drivers, this is done by writing + to the /dev/adapter?/ca? device node. Return Value ------------ diff --git a/include/uapi/linux/dvb/ca.h b/include/uapi/linux/dvb/ca.h index c36fdb8e2733..24fc38efbc2b 100644 --- a/include/uapi/linux/dvb/ca.h +++ b/include/uapi/linux/dvb/ca.h @@ -101,7 +101,16 @@ struct ca_caps { unsigned int descr_type; }; -/* a message to/from a CI-CAM */ +/** + * struct ca_msg - a message to/from a CI-CAM + * + * @index: unused + * @type: unused + * @length: length of the message + * @msg: message + * + * This struct carries a message to be send/received from a CI CA module. + */ struct ca_msg { unsigned int index; unsigned int type; |