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media: ca.h: document ca_msg and the corresponding ioctls

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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>
This commit is contained in:
Mauro Carvalho Chehab 2017-09-04 08:03:40 -04:00
parent bd9049edc6
commit 7e6854a9bf
3 changed files with 21 additions and 15 deletions
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11
include/uapi/linux/dvb/ca.h
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@ -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;