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media: cec.h: add cec_msg_recv_is_rx/tx_result helpers

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These two helper functions return true if the received message
contains the result of a previous non-blocking transmit. Either
the tx_status result (cec_msg_recv_is_tx_result) of the transmit,
or the rx_status result (cec_msg_recv_is_rx_result) of the reply
to the original transmit.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Hans Verkuil 2022-03-09 10:55:43 +00:00 committed by Mauro Carvalho Chehab
parent f9d0ecbf56
commit 567f882a40
1 changed files with 20 additions and 0 deletions
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20
include/uapi/linux/cec.h
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@ -142,6 +142,26 @@ static inline void cec_msg_set_reply_to(struct cec_msg *msg,
msg->reply = msg->timeout = 0;
}
/**
* cec_msg_recv_is_tx_result - return true if this message contains the
* result of an earlier non-blocking transmit
* @msg: the message structure from CEC_RECEIVE
*/
static inline int cec_msg_recv_is_tx_result(const struct cec_msg *msg)
{
return msg->sequence && msg->tx_status && !msg->rx_status;
}
/**
* cec_msg_recv_is_rx_result - return true if this message contains the
* reply of an earlier non-blocking transmit
* @msg: the message structure from CEC_RECEIVE
*/
static inline int cec_msg_recv_is_rx_result(const struct cec_msg *msg)
{
return msg->sequence && !msg->tx_status && msg->rx_status;
}
/* cec_msg flags field */
#define CEC_MSG_FL_REPLY_TO_FOLLOWERS (1 << 0)
#define CEC_MSG_FL_RAW (1 << 1)