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@xxxxxxxxx>
---
include/uapi/linux/cec.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/include/uapi/linux/cec.h b/include/uapi/linux/cec.h
index de936f5e446d..1d48da926216 100644
--- a/include/uapi/linux/cec.h
+++ b/include/uapi/linux/cec.h
@@ -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)
--
2.34.1
