The av7110 driver uses CA_SET_DESCR to store the descrambler
control words at the CA descrambler slots.
Document it.
Thanks-to: Honza Petrouš <jpetr...@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>
---
Documentation/media/uapi/dvb/ca-set-descr.rst | 15 ++-------------
include/uapi/linux/dvb/ca.h | 9 ++++++++-
2 files changed, 10 insertions(+), 14 deletions(-)
diff --git a/Documentation/media/uapi/dvb/ca-set-descr.rst
b/Documentation/media/uapi/dvb/ca-set-descr.rst
index 9c484317d55c..a6c47205ffd8 100644
--- a/Documentation/media/uapi/dvb/ca-set-descr.rst
+++ b/Documentation/media/uapi/dvb/ca-set-descr.rst
@@ -28,22 +28,11 @@ Arguments
``msg``
Pointer to struct :c:type:`ca_descr`.
-.. c:type:: ca_descr
-
-.. code-block:: c
-
- struct ca_descr {
- unsigned int index;
- unsigned int parity;
- unsigned char cw[8];
- };
-
-
Description
-----------
-.. note:: This ioctl is undocumented. Documentation is welcome.
-
+CA_SET_DESCR is used for feeding descrambler CA slots with descrambling
+keys (refered as control words).
Return Value
------------
diff --git a/include/uapi/linux/dvb/ca.h b/include/uapi/linux/dvb/ca.h
index f66ed53f4dc7..a62ddf0cebcd 100644
--- a/include/uapi/linux/dvb/ca.h
+++ b/include/uapi/linux/dvb/ca.h
@@ -109,9 +109,16 @@ struct ca_msg {
unsigned char msg[256];
};
+/**
+ * struct ca_descr - CA descrambler control words info
+ *
+ * @index: CA Descrambler slot
+ * @parity: control words parity, where 0 means even and 1 means odd
+ * @cw: CA Descrambler control words
+ */
struct ca_descr {
unsigned int index;
- unsigned int parity; /* 0 == even, 1 == odd */
+ unsigned int parity;
unsigned char cw[8];
};
--
2.13.5
