From: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Date: Wed, 9 Mar 2022 10:55:43 +0000 (+0000)
Subject: media: cec.h: add cec_msg_recv_is_rx/tx_result helpers
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=567f882a401346779d05a90beb8f21865ebdd398;p=linux.git

media: cec.h: add cec_msg_recv_is_rx/tx_result helpers

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>
---

diff --git a/include/uapi/linux/cec.h b/include/uapi/linux/cec.h
index de936f5e446d8..1d48da9262163 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)