linux-kernel - [PATCH] HID: rmi: fix masks for x and w

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Message-ID: <1400187149-7619-1-git-send-email-aduggan@synaptics.com>
Date:	Thu, 15 May 2014 13:52:29 -0700
From:	Andrew Duggan <aduggan@...aptics.com>
To:	<linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:	Jiri Kosina <jkosina@...e.cz>,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Andrew Duggan <aduggan@...aptics.com>
Subject: [PATCH] HID: rmi: fix masks for x and w_x data

The F11 data in the HID report contains four bits of data for w_x and the least significant bits
of x. Currently only the first three bits are being used which is resulting in small jumps in
the position data on the x axis and in the w_x data.

Signed-off-by: Andrew Duggan <aduggan@...aptics.com>
---
 drivers/hid/hid-rmi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c
index 7ebdc96..c529b03 100644
--- a/drivers/hid/hid-rmi.c
+++ b/drivers/hid/hid-rmi.c
@@ -277,9 +277,9 @@ static void rmi_f11_process_touch(struct rmi_data *hdata, int slot,
 	input_mt_report_slot_state(hdata->input, MT_TOOL_FINGER,
 			finger_state == 0x01);
 	if (finger_state == 0x01) {
-		x = (touch_data[0] << 4) | (touch_data[2] & 0x07);
+		x = (touch_data[0] << 4) | (touch_data[2] & 0x0F);
 		y = (touch_data[1] << 4) | (touch_data[2] >> 4);
-		wx = touch_data[3] & 0x07;
+		wx = touch_data[3] & 0x0F;
 		wy = touch_data[3] >> 4;
 		wide = (wx > wy);
 		major = max(wx, wy);
-- 
1.9.1

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