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[media] cec: add cec_transmit_attempt_done helper function

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A simpler variant of cec_transmit_done to be used where the HW does
just a single attempt at a transmit. So if the status indicates an
error, then the corresponding error count will always be 1 and this
function figures that out based on the status argument.

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 2017-06-07 11:46:10 -03:00 committed by Mauro Carvalho Chehab
parent 135327899d
commit c94cdc1e0c
3 changed files with 42 additions and 0 deletions
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10
Documentation/media/kapi/cec-core.rst
View File

@ -194,6 +194,11 @@ When a transmit finished (successfully or otherwise):
void cec_transmit_done(struct cec_adapter *adap, u8 status, u8 arb_lost_cnt,
u8 nack_cnt, u8 low_drive_cnt, u8 error_cnt);
or:
.. c:function::
void cec_transmit_attempt_done(struct cec_adapter *adap, u8 status);
The status can be one of:
CEC_TX_STATUS_OK:
@ -231,6 +236,11 @@ to 1, if the hardware does support retry then either set these counters to
0 if the hardware provides no feedback of which errors occurred and how many
times, or fill in the correct values as reported by the hardware.
The cec_transmit_attempt_done() function is a helper for cases where the
hardware never retries, so the transmit is always for just a single
attempt. It will call cec_transmit_done() in turn, filling in 1 for the
count argument corresponding to the status. Or all 0 if the status was OK.
When a CEC message was received:
.. c:function::

26
drivers/media/cec/cec-adap.c
View File

@ -553,6 +553,32 @@ unlock:
}
EXPORT_SYMBOL_GPL(cec_transmit_done);
void cec_transmit_attempt_done(struct cec_adapter *adap, u8 status)
{
switch (status) {
case CEC_TX_STATUS_OK:
cec_transmit_done(adap, status, 0, 0, 0, 0);
return;
case CEC_TX_STATUS_ARB_LOST:
cec_transmit_done(adap, status, 1, 0, 0, 0);
return;
case CEC_TX_STATUS_NACK:
cec_transmit_done(adap, status, 0, 1, 0, 0);
return;
case CEC_TX_STATUS_LOW_DRIVE:
cec_transmit_done(adap, status, 0, 0, 1, 0);
return;
case CEC_TX_STATUS_ERROR:
cec_transmit_done(adap, status, 0, 0, 0, 1);
return;
default:
/* Should never happen */
WARN(1, "cec-%s: invalid status 0x%02x\n", adap->name, status);
return;
}
}
EXPORT_SYMBOL_GPL(cec_transmit_attempt_done);
/*
* Called when waiting for a reply times out.
*/

6
include/media/cec.h
View File

@ -227,6 +227,12 @@ int cec_transmit_msg(struct cec_adapter *adap, struct cec_msg *msg,
/* Called by the adapter */
void cec_transmit_done(struct cec_adapter *adap, u8 status, u8 arb_lost_cnt,
u8 nack_cnt, u8 low_drive_cnt, u8 error_cnt);
/*
* Simplified version of cec_transmit_done for hardware that doesn't retry
* failed transmits. So this is always just one attempt in which case
* the status is sufficient.
*/
void cec_transmit_attempt_done(struct cec_adapter *adap, u8 status);
void cec_received_msg(struct cec_adapter *adap, struct cec_msg *msg);
/**