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[media] cec: add CEC_MSG_FL_REPLY_TO_FOLLOWERS

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Give the caller more control over how replies to a transmit are
handled. By default the reply will only go to the filehandle that
called CEC_TRANSMIT. If this new flag is set, then the reply will
also go to all followers.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Hans Verkuil
2016-11-01 08:55:05 -02:00
committed by Mauro Carvalho Chehab
parent f4062625ed
commit adc0c62278
5 changed files with 29 additions and 9 deletions
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22
Documentation/media/uapi/cec/cec-ioc-receive.rst
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@@ -119,7 +119,7 @@ result.
transmit.
* - __u32
- ``flags``
- Flags. No flags are defined yet, so set this to 0.
- Flags. See :ref:`cec-msg-flags` for a list of available flags.
* - __u8
- ``tx_status``
- The status bits of the transmitted message. See
@@ -180,6 +180,26 @@ result.
valid if the :ref:`CEC_TX_STATUS_ERROR <CEC-TX-STATUS-ERROR>` status bit is set.
.. _cec-msg-flags:
.. flat-table:: Flags for struct cec_msg
:header-rows: 0
:stub-columns: 0
:widths: 3 1 4
* .. _`CEC-MSG-FL-REPLY-TO-FOLLOWERS`:
- ``CEC_MSG_FL_REPLY_TO_FOLLOWERS``
- 1
- If a CEC transmit expects a reply, then by default that reply is only sent to
the filehandle that called :ref:`ioctl CEC_TRANSMIT <CEC_TRANSMIT>`. If this
flag is set, then the reply is also sent to all followers, if any. If the
filehandle that called :ref:`ioctl CEC_TRANSMIT <CEC_TRANSMIT>` is also a
follower, then that filehandle will receive the reply twice: once as the
result of the :ref:`ioctl CEC_TRANSMIT <CEC_TRANSMIT>`, and once via
:ref:`ioctl CEC_RECEIVE <CEC_RECEIVE>`.
.. tabularcolumns:: |p{5.6cm}|p{0.9cm}|p{11.0cm}|
.. _cec-tx-status: