linux-kernel - [PATCH v2 08/10] Input: elan_i2c

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Date:   Tue, 21 May 2019 15:27:10 +0200
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        KT Liao <kt.liao@....com.tw>, Rob Herring <robh+dt@...nel.org>,
        Aaron Ma <aaron.ma@...onical.com>,
        Hans de Goede <hdegoede@...hat.com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>
Subject: [PATCH v2 08/10] Input: elan_i2c - export true width/height

The width/height is actually in the same unit than X and Y. So we should
not tamper the data, but just set the proper resolution, so that userspace
can correctly detect which touch is a palm or a finger.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

--

new in v2
---
 drivers/input/mouse/elan_i2c_core.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/input/mouse/elan_i2c_core.c b/drivers/input/mouse/elan_i2c_core.c
index 7ff044c6cd11..6f4feedb7765 100644
--- a/drivers/input/mouse/elan_i2c_core.c
+++ b/drivers/input/mouse/elan_i2c_core.c
@@ -45,7 +45,6 @@
 #define DRIVER_NAME		"elan_i2c"
 #define ELAN_VENDOR_ID		0x04f3
 #define ETP_MAX_PRESSURE	255
-#define ETP_FWIDTH_REDUCE	90
 #define ETP_FINGER_WIDTH	15
 #define ETP_RETRY_COUNT		3
 
@@ -915,12 +914,8 @@ static void elan_report_contact(struct elan_tp_data *data,
 			return;
 		}
 
-		/*
-		 * To avoid treating large finger as palm, let's reduce the
-		 * width x and y per trace.
-		 */
-		area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
-		area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
+		area_x = mk_x * data->width_x;
+		area_y = mk_y * data->width_y;
 
 		major = max(area_x, area_y);
 		minor = min(area_x, area_y);
@@ -1123,8 +1118,10 @@ static int elan_setup_input_device(struct elan_tp_data *data)
 			     ETP_MAX_PRESSURE, 0, 0);
 	input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0,
 			     ETP_FINGER_WIDTH * max_width, 0, 0);
+	input_abs_set_res(input, ABS_MT_TOUCH_MAJOR, data->x_res);
 	input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0,
 			     ETP_FINGER_WIDTH * min_width, 0, 0);
+	input_abs_set_res(input, ABS_MT_TOUCH_MINOR, data->y_res);
 
 	data->input = input;
 
-- 
2.21.0