linux-kernel - [PATCH 5/9] media: cros-ec-cec: Support multiple ports in MKBP cec

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Date:   Mon, 14 Aug 2023 14:29:14 +1000
From:   Reka Norman <rekanorman@...omium.org>
To:     Hans Verkuil <hverkuil-cisco@...all.nl>
Cc:     Neil Armstrong <narmstrong@...libre.com>,
        Daisuke Nojiri <dnojiri@...omium.org>,
        Stefan Adolfsson <sadolfsson@...gle.com>,
        Reka Norman <rekanorman@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org
Subject: [PATCH 5/9] media: cros-ec-cec: Support multiple ports in MKBP cec_events

Use the top four bits of the cec_events MKBP event to store the port
number.

Signed-off-by: Reka Norman <rekanorman@...omium.org>
---

 drivers/media/cec/platform/cros-ec/cros-ec-cec.c | 13 +++++++++++--
 include/linux/platform_data/cros_ec_commands.h   | 10 ++++++++++
 2 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/drivers/media/cec/platform/cros-ec/cros-ec-cec.c b/drivers/media/cec/platform/cros-ec/cros-ec-cec.c
index d674a432dfdd..eb4b778f83e9 100644
--- a/drivers/media/cec/platform/cros-ec/cros-ec-cec.c
+++ b/drivers/media/cec/platform/cros-ec/cros-ec-cec.c
@@ -77,8 +77,17 @@ static void handle_cec_message(struct cros_ec_cec *cros_ec_cec)
 static void handle_cec_event(struct cros_ec_cec *cros_ec_cec)
 {
 	struct cros_ec_device *cros_ec = cros_ec_cec->cros_ec;
-	uint32_t events = cros_ec->event_data.data.cec_events;
-	struct cros_ec_cec_port *port = cros_ec_cec->ports[CEC_PORT];
+	uint32_t cec_events = cros_ec->event_data.data.cec_events;
+	int port_num = EC_MKBP_EVENT_CEC_GET_PORT(cec_events);
+	uint32_t events = EC_MKBP_EVENT_CEC_GET_EVENTS(cec_events);
+	struct cros_ec_cec_port *port;
+
+	if (port_num < 0 || port_num >= cros_ec_cec->num_ports) {
+		dev_err(cros_ec->dev,
+			"received CEC event for invalid port %d\n", port_num);
+		return;
+	}
+	port = cros_ec_cec->ports[port_num];
 
 	if (events & EC_MKBP_CEC_SEND_OK)
 		cec_transmit_attempt_done(port->adap, CEC_TX_STATUS_OK);
diff --git a/include/linux/platform_data/cros_ec_commands.h b/include/linux/platform_data/cros_ec_commands.h
index 9a0c6e28f370..b7e8573a8a49 100644
--- a/include/linux/platform_data/cros_ec_commands.h
+++ b/include/linux/platform_data/cros_ec_commands.h
@@ -4440,6 +4440,16 @@ struct ec_response_i2c_passthru_protect {
 
 #define MAX_CEC_MSG_LEN 16
 
+/*
+ * Helper macros for packing/unpacking cec_events.
+ * bits[27:0] : bitmask of events from enum mkbp_cec_event
+ * bits[31:28]: port number
+ */
+#define EC_MKBP_EVENT_CEC_PACK(events, port) \
+		(((events) & GENMASK(27, 0)) | (((port) & 0xf) << 28))
+#define EC_MKBP_EVENT_CEC_GET_EVENTS(event) ((event) & GENMASK(27, 0))
+#define EC_MKBP_EVENT_CEC_GET_PORT(event) (((event) >> 28) & 0xf)
+
 /* CEC message from the AP to be written on the CEC bus */
 #define EC_CMD_CEC_WRITE_MSG 0x00B8
 
-- 
2.41.0.640.ga95def55d0-goog