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Subject[PATCH 2/2] media: ca.h: document ca_msg and the corresponding ioctls
Date
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>
---
Documentation/media/uapi/dvb/ca-get-msg.rst | 19 ++++++-------------
Documentation/media/uapi/dvb/ca-send-msg.rst | 6 +++++-
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 a62ddf0cebcd..9bcd4cad497b 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;
--
2.13.5
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