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media: dvb_frontend: add physical layer scrambling support

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This commit adds a new property DTV_SCRAMBLING_SEQUENCE_INDEX.

This 18 bit field, when present, carries the index of the DVB-S2 physical
layer scrambling sequence as defined in clause 5.5.4 of EN 302 307.
There is no explicit signalling method to convey scrambling sequence index
to the receiver. If S2 satellite delivery system descriptor is available
it can be used to read the scrambling sequence index (EN 300 468 table 41).

By default, gold scrambling sequence index 0 is used. The valid scrambling
sequence index range is from 0 to 262142.

Increase the DVB API version in order userspace to be aware of the changes.

Signed-off-by: Athanasios Oikonomou <[email protected]>
Acked-by: Ralph Metzler <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
This commit is contained in:
Athanasios Oikonomou 2017-12-16 07:23:38 -05:00 • committed by Mauro Carvalho Chehab
commit f9d7912619
6 changed files with 42 additions and 2 deletions
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18
Documentation/media/uapi/dvb/fe_property_parameters.rst
View file

@ -987,3 +987,21 @@ Possible values: 0, 1, LNA_AUTO
1, LNA on
use the special macro LNA_AUTO to set LNA auto
.. _DTV-SCRAMBLING-SEQUENCE-INDEX:
DTV_SCRAMBLING_SEQUENCE_INDEX
=============================
Used on DVB-S2.
This 18 bit field, when present, carries the index of the DVB-S2 physical
layer scrambling sequence as defined in clause 5.5.4 of EN 302 307.
There is no explicit signalling method to convey scrambling sequence index
to the receiver. If S2 satellite delivery system descriptor is available
it can be used to read the scrambling sequence index (EN 300 468 table 41).
By default, gold scrambling sequence index 0 is used.
The valid scrambling sequence index range is from 0 to 262142.

2
Documentation/media/uapi/dvb/frontend-property-satellite-systems.rst
View file

@ -60,6 +60,8 @@ following parameters:
- :ref:`DTV_STREAM_ID <DTV-STREAM-ID>`
- :ref:`DTV_SCRAMBLING_SEQUENCE_INDEX <DTV-SCRAMBLING-SEQUENCE-INDEX>`
In addition, the :ref:`DTV QoS statistics <frontend-stat-properties>`
are also valid.