linux-kernel - [PATCH RFC 4/4] Input: melfas-mip4 - add support for event formats 4 and 9

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Message-Id: <20250503-mip4-touchkey-v1-4-b483cda29a5b@disroot.org>
Date: Sat, 03 May 2025 14:38:30 +0530
From: Kaustabh Chakraborty <kauschluss@...root.org>
To: Sangwon Jee <jeesw@...fas.com>, 
 Dmitry Torokhov <dmitry.torokhov@...il.com>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Henrik Rydberg <rydberg@...math.org>
Cc: linux-input@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Kaustabh Chakraborty <kauschluss@...root.org>
Subject: [PATCH RFC 4/4] Input: melfas-mip4 - add support for event formats
 4 and 9

Valid event formats in this driver is limited to 0, 1, and 3. These are
event formats for MIP4 touchscreen devices. Add support for event
formats 4 and 9, which belong to touchkey devices.

While at it, simplify the logic in function mip4_query_device where
valid event formats are checked. Use a human-readable switch-case block
instead of an if statement with obscure conditions.

Signed-off-by: Kaustabh Chakraborty <kauschluss@...root.org>
---
 drivers/input/touchscreen/melfas_mip4.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/input/touchscreen/melfas_mip4.c b/drivers/input/touchscreen/melfas_mip4.c
index 57b657694a420220be135c2f78d3ddad3ef6f520..95a78c86873355d0a8e0207b1eb4a8408f55cee4 100644
--- a/drivers/input/touchscreen/melfas_mip4.c
+++ b/drivers/input/touchscreen/melfas_mip4.c
@@ -360,9 +360,19 @@ static int mip4_query_device(struct mip4_ts *ts)
 		dev_dbg(&ts->client->dev, "event_format: %d, event_size: %d\n",
 			ts->event_format, ts->event_size);
 
-		if (ts->event_format == 2 || ts->event_format > 3)
+		switch (ts->event_format) {
+		/* Touchscreens */
+		case 0:
+		case 1:
+		case 3:
+		/* Touchkeys */
+		case 4:
+		case 9:
+			break;
+		default:
 			dev_warn(&ts->client->dev,
 				 "Unknown event format %d\n", ts->event_format);
+		}
 	}
 
 	return 0;
@@ -440,6 +450,8 @@ static void mip4_report_keys(struct mip4_ts *ts, u8 *packet)
 	switch (ts->event_format) {
 	case 0:
 	case 1:
+	case 4:
+	case 9:
 		key = packet[0] & 0x0F;
 		down = packet[0] & 0x80;
 		break;
@@ -552,6 +564,8 @@ static int mip4_handle_packet(struct mip4_ts *ts, u8 *packet)
 	switch (ts->event_format) {
 	case 0:
 	case 1:
+	case 4:
+	case 9:
 		type = (packet[0] & 0x40) >> 6;
 		break;
 

-- 
2.49.0