linux-kernel - [PATCH] Input: trackpoint - Add Suspend mode for Elan TrackPoint

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Date:   Fri,  4 Sep 2020 10:42:31 +0800
From:   "jingle.wu" <jingle.wu@....com.tw>
To:     linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        dmitry.torokhov@...il.com
Cc:     phoenix@....com.tw,
        "jingle.wu" <jingle.wu@...n.corp-partner.google.com>
Subject: [PATCH] Input: trackpoint - Add Suspend mode for Elan TrackPoint

From: "jingle.wu" <jingle.wu@...n.corp-partner.google.com>

Add suspend command for elan trackpoint
---
 drivers/input/mouse/trackpoint.c | 16 ++++++++++++++++
 drivers/input/mouse/trackpoint.h |  1 +
 2 files changed, 17 insertions(+)

diff --git a/drivers/input/mouse/trackpoint.c b/drivers/input/mouse/trackpoint.c
index 3eefee2ee2a1..b3cba973a4eb 100644
--- a/drivers/input/mouse/trackpoint.c
+++ b/drivers/input/mouse/trackpoint.c
@@ -389,6 +389,20 @@ static int trackpoint_reconnect(struct psmouse *psmouse)
 	return 0;
 }
 
+static void trackpoint_cleanup(struct psmouse *psmouse)
+{
+	struct trackpoint_data *tp = psmouse->private;
+	u8 param[3] = { TP_TOGGLE, TP_TOGGLE_BURST, TP_TOGGLE_ELAN_SLEEP };
+
+	if (tp->variant_id == TP_VARIANT_ELAN) {
+		if (ps2_command(&psmouse->ps2dev, param,
+				MAKE_PS2_CMD(3, 0, TP_COMMAND))) {
+			psmouse_err(psmouse,
+				    "failed to suspend trackpont.\n");
+		}
+	}
+}
+
 int trackpoint_detect(struct psmouse *psmouse, bool set_properties)
 {
 	struct ps2dev *ps2dev = &psmouse->ps2dev;
@@ -421,6 +435,8 @@ int trackpoint_detect(struct psmouse *psmouse, bool set_properties)
 	psmouse->reconnect = trackpoint_reconnect;
 	psmouse->disconnect = trackpoint_disconnect;
 
+	psmouse->cleanup = trackpoint_cleanup;
+
 	if (variant_id != TP_VARIANT_IBM) {
 		/* Newer variants do not support extended button query. */
 		button_info = 0x33;
diff --git a/drivers/input/mouse/trackpoint.h b/drivers/input/mouse/trackpoint.h
index 5cb93ed26085..c7fa75452976 100644
--- a/drivers/input/mouse/trackpoint.h
+++ b/drivers/input/mouse/trackpoint.h
@@ -107,6 +107,7 @@
 #define TP_TOGGLE_EXT_TAG	0x22	/* Bit 3 of the first packet coming from the
 					   external device will be forced to 1 */
 #define TP_MASK_EXT_TAG			0x04
+#define TP_TOGGLE_ELAN_SLEEP	0x8
 
 
 /* Power on Self Test Results */
-- 
2.17.1