linux-kernel - [PATCH v3] Input: atmel_mxt_ts - Report pressure information from the driver

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Date:	Mon, 15 Aug 2011 11:02:30 -0400
From:	Yufeng Shen <miletus@...omium.org>
To:	linux-input@...r.kernel.org
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Henrik Rydberg <rydberg@...omail.se>,
	Iiro Valkonen <iiro.valkonen@...el.com>,
	Joonyoung Shim <jy0922.shim@...sung.com>,
	Yufeng Shen <miletus@...omium.org>,
	linux-kernel@...r.kernel.org,
	Michael Gong <Michael.Gong@...el.com>,
	Alan Bowens <Alan.Bowens@...el.com>
Subject: [PATCH v3] Input: atmel_mxt_ts - Report pressure information from the driver

Atmel mxt1386 touch controller has the touch pressure information but
the current driver atmel_mxt_ts does not expose it to the user space.
This patch makes the driver report the touch pressure information to
user space.

ChangeLog:
v2: fixed indentation as commented by Wanlong Gao
v3: added signed-off-by

Change-Id: Ie0e4683a3cd5ec79222f7682b0ddc24f909af543
Signed-off-by: Yufeng Shen <miletus@...omium.org>
---
 drivers/input/touchscreen/atmel_mxt_ts.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c
index ae00604..9bdf4e0 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -244,6 +244,7 @@ struct mxt_finger {
 	int x;
 	int y;
 	int area;
+	int pressure;
 };
 
 /* Each client has this additional data */
@@ -536,6 +537,8 @@ static void mxt_input_report(struct mxt_data *data, int single_id)
 					finger[id].x);
 			input_report_abs(input_dev, ABS_MT_POSITION_Y,
 					finger[id].y);
+			input_report_abs(input_dev, ABS_MT_PRESSURE,
+					finger[id].pressure);
 		} else {
 			finger[id].status = 0;
 		}
@@ -560,6 +563,7 @@ static void mxt_input_touchevent(struct mxt_data *data,
 	int x;
 	int y;
 	int area;
+	int pressure;
 
 	/* Check the touch is present on the screen */
 	if (!(status & MXT_DETECT)) {
@@ -584,6 +588,7 @@ static void mxt_input_touchevent(struct mxt_data *data,
 		y = y >> 2;
 
 	area = message->message[4];
+	pressure = message->message[5];
 
 	dev_dbg(dev, "[%d] %s x: %d, y: %d, area: %d\n", id,
 		status & MXT_MOVE ? "moved" : "pressed",
@@ -594,6 +599,7 @@ static void mxt_input_touchevent(struct mxt_data *data,
 	finger[id].x = x;
 	finger[id].y = y;
 	finger[id].area = area;
+	finger[id].pressure = pressure;
 
 	mxt_input_report(data, id);
 }
@@ -1125,6 +1131,8 @@ static int __devinit mxt_probe(struct i2c_client *client,
 			     0, data->max_x, 0, 0);
 	input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
 			     0, data->max_y, 0, 0);
+	input_set_abs_params(input_dev, ABS_MT_PRESSURE,
+			     0, 255, 0, 0);
 
 	input_set_drvdata(input_dev, data);
 	i2c_set_clientdata(client, data);
-- 
1.7.3.1

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