From 8a038b83e012097a7ac6cfb9f6c5fac1da8fad6e Mon Sep 17 00:00:00 2001
From: Martin Kepplinger <martink@posteo.de>
Date: Mon, 1 May 2017 10:13:47 -0700
Subject: [PATCH] Input: ar1021_i2c - use BIT to check for a bit

The MSB for the first byte of touch data transmission is always 1. Make
it a little more obvious we're testing this bit by using BIT(7).

Signed-off-by: Martin Kepplinger <martink@posteo.de>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/input/touchscreen/ar1021_i2c.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/input/touchscreen/ar1021_i2c.c b/drivers/input/touchscreen/ar1021_i2c.c
index 21c74ee59341..f9dcbd63e598 100644
--- a/drivers/input/touchscreen/ar1021_i2c.c
+++ b/drivers/input/touchscreen/ar1021_i2c.c
@@ -6,6 +6,7 @@
  * License: GPLv2 as published by the FSF.
  */
 
+#include <linux/bitops.h>
 #include <linux/module.h>
 #include <linux/input.h>
 #include <linux/of.h>
@@ -42,7 +43,7 @@ static irqreturn_t ar1021_i2c_irq(int irq, void *dev_id)
 		goto out;
 
 	/* sync bit set ? */
-	if ((data[0] & 0x80) == 0)
+	if (!(data[0] & BIT(7)))
 		goto out;
 
 	button = data[0] & BIT(0);
-- 
2.20.1