diff options
| author | Mauro Carvalho Chehab | 2017-09-03 20:50:17 -0400 |
|---|---|---|
| committer | Mauro Carvalho Chehab | 2017-09-05 06:23:07 -0400 |
| commit | bd9049edc66e13e868f819c39844f60443e70817 (patch) | |
| tree | 82cbfd5b648d7f11baf3bc9ba6ac8771efa609d4 | |
| parent | 56d51b65bcc7a5780663abd579fb6f039616b347 (diff) | |
media: ca docs: document CA_SET_DESCR ioctl and structs
The av7110 driver uses CA_SET_DESCR to store the descrambler
control words at the CA descrambler slots.
Document it.
Thanks-to: Honza Petrouš <jpetrous@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
| -rw-r--r-- | Documentation/media/uapi/dvb/ca-set-descr.rst | 15 | ||||
| -rw-r--r-- | 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 7ee641b4124c..c36fdb8e2733 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]; }; |