[media] cec: accept two replies for CEC_MSG_INITIATE_ARC

The CEC_MSG_INITIATE_ARC message is special since it is the ONLY
CEC message that accepts two possible valid replies:

CEC_MSG_REPORT_ARC_INITIATED and CEC_MSG_REPORT_ARC_TERMINATED.

So if the transmitted message is CEC_MSG_INITIATE_ARC and the remote
side replied with CEC_MSG_REPORT_ARC_INITIATED or CEC_MSG_REPORT_ARC_TERMINATED,
then a msg->reply value of CEC_MSG_REPORT_ARC_INITIATED or
CEC_MSG_REPORT_ARC_TERMINATED will match either reply.

I thought about either adding a second reply2 field, but that's ugly
for all other messages that have only one reply, and what if in the
future a new message is added that can have three replies?

Another option would be to add a cec_msg flag, but really, the combination
of CEC_MSG_REPORT_ARC_INITIATED and a reply value of one of the two
possible replies already functions as a flag.

Another advantage of this approach is that it is safe to re-use a
cec_msg struct. No need to zero a flags field or a reply2 field.

So since this really is an exception in the CEC specification, I
decided to implement it as an exception as well.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/Documentation/media/uapi/cec/cec-ioc-receive.rst b/Documentation/media/uapi/cec/cec-ioc-receive.rst
index b4dffd2f7dfa535365992988894ab79589337251..bdf015b1d1dc0a677b89cdc05b7637687370a496 100644 (file)
--- a/Documentation/media/uapi/cec/cec-ioc-receive.rst
+++ b/Documentation/media/uapi/cec/cec-ioc-receive.rst
@@ -142,6 +142,14 @@ result.
        Feature Abort reply. In this case ``rx_status`` will either be set
        to :ref:`CEC_RX_STATUS_TIMEOUT <CEC-RX-STATUS-TIMEOUT>` or
        :ref:`CEC_RX_STATUS_FEATURE_ABORT <CEC-RX-STATUS-FEATURE-ABORT>`.
+
+       If the transmitter message is ``CEC_MSG_INITIATE_ARC`` then the ``reply``
+       values ``CEC_MSG_REPORT_ARC_INITIATED`` and ``CEC_MSG_REPORT_ARC_TERMINATED``
+       are processed differently: either value will match both possible replies.
+       The reason is that the ``CEC_MSG_INITIATE_ARC`` message is the only CEC
+       message that has two possible replies other than Feature Abort. The
+       ``reply`` field will be updated with the actual reply so that it is
+       synchronized with the contents of the received message.
     * - __u8
       - ``rx_status``
       - The status bits of the received message. See

diff --git a/drivers/staging/media/cec/TODO b/drivers/staging/media/cec/TODO
index ce69001b04280a0de0e52b479427e3f8759cfbca..5a4cfdf8d15ece24928743df9e8411672ff554f3 100644 (file)
--- a/drivers/staging/media/cec/TODO
+++ b/drivers/staging/media/cec/TODO
@@ -1,18 +1,5 @@
-The reason why cec.c is still in staging is that I would like
-to have a bit more confidence in the uABI. The kABI is fine,
-no problem there, but I would like to let the public API mature
-a bit.
+TODOs:
 
-Once I'm confident that I didn't miss anything then the cec.c source
-can move to drivers/media and the linux/cec.h and linux/cec-funcs.h
-headers can move to uapi/linux and added to uapi/linux/Kbuild to make
-them public.
-
-Hopefully this will happen later in 2016.
-
-Other TODOs:
-
-- There are two possible replies to CEC_MSG_INITIATE_ARC. How to handle that?
 - Should CEC_LOG_ADDR_TYPE_SPECIFIC be replaced by TYPE_2ND_TV and TYPE_PROCESSOR?
   And also TYPE_SWITCH and TYPE_CDC_ONLY in addition to the TYPE_UNREGISTERED?
   This should give the framework more information about the device type

diff --git a/drivers/staging/media/cec/cec-adap.c b/drivers/staging/media/cec/cec-adap.c
index 93b53e602e48eceed3390de5067ff5ccbaca92ff..a65d8667b78e3003c5f472d4771413531530b551 100644 (file)
--- a/drivers/staging/media/cec/cec-adap.c
+++ b/drivers/staging/media/cec/cec-adap.c
@@ -958,6 +958,18 @@ void cec_received_msg(struct cec_adapter *adap, struct cec_msg *msg)
                list_for_each_entry(data, &adap->wait_queue, list) {
                        struct cec_msg *dst = &data->msg;
 
+                       /*
+                        * The *only* CEC message that has two possible replies
+                        * is CEC_MSG_INITIATE_ARC.
+                        * In this case allow either of the two replies.
+                        */
+                       if (!abort && dst->msg[1] == CEC_MSG_INITIATE_ARC &&
+                           (cmd == CEC_MSG_REPORT_ARC_INITIATED ||
+                            cmd == CEC_MSG_REPORT_ARC_TERMINATED) &&
+                           (dst->reply == CEC_MSG_REPORT_ARC_INITIATED ||
+                            dst->reply == CEC_MSG_REPORT_ARC_TERMINATED))
+                               dst->reply = cmd;
+
                        /* Does the command match? */
                        if ((abort && cmd != dst->msg[1]) ||
                            (!abort && cmd != dst->reply))