linux-kernel - [PATCH V3 16/29] input: use parity64 in sidewinder

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Date:	Thu, 14 Apr 2016 11:10:15 +0800
From:	zengzhaoxiu@....com
To:	linux-kernel@...r.kernel.org
Cc:	Zhaoxiu Zeng <zhaoxiu.zeng@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org
Subject: [PATCH V3 16/29] input: use parity64 in sidewinder

From: Zhaoxiu Zeng <zhaoxiu.zeng@...il.com>

Signed-off-by: Zhaoxiu Zeng <zhaoxiu.zeng@...il.com>
---
 drivers/input/joystick/sidewinder.c | 24 ++++--------------------
 1 file changed, 4 insertions(+), 20 deletions(-)

diff --git a/drivers/input/joystick/sidewinder.c b/drivers/input/joystick/sidewinder.c
index 4a95b22..7ea486e 100644
--- a/drivers/input/joystick/sidewinder.c
+++ b/drivers/input/joystick/sidewinder.c
@@ -259,22 +259,6 @@ static void sw_init_digital(struct gameport *gameport)
 }
 
 /*
- * sw_parity() computes parity of __u64
- */
-
-static int sw_parity(__u64 t)
-{
-	int x = t ^ (t >> 32);
-
-	x ^= x >> 16;
-	x ^= x >> 8;
-	x ^= x >> 4;
-	x ^= x >> 2;
-	x ^= x >> 1;
-	return x & 1;
-}
-
-/*
  * sw_ccheck() checks synchronization bits and computes checksum of nibbles.
  */
 
@@ -334,7 +318,7 @@ static int sw_parse(unsigned char *buf, struct sw *sw)
 
 			for (i = 0; i < sw->number; i ++) {
 
-				if (sw_parity(GB(i*15,15)))
+				if (parity64(GB(i*15,15)))
 					return -1;
 
 				input_report_abs(sw->dev[i], ABS_X, GB(i*15+3,1) - GB(i*15+2,1));
@@ -351,7 +335,7 @@ static int sw_parse(unsigned char *buf, struct sw *sw)
 		case SW_ID_PP:
 		case SW_ID_FFP:
 
-			if (!sw_parity(GB(0,48)) || (hat = GB(42,4)) > 8)
+			if (!parity64(GB(0,48)) || (hat = GB(42,4)) > 8)
 				return -1;
 
 			dev = sw->dev[0];
@@ -372,7 +356,7 @@ static int sw_parse(unsigned char *buf, struct sw *sw)
 
 		case SW_ID_FSP:
 
-			if (!sw_parity(GB(0,43)) || (hat = GB(28,4)) > 8)
+			if (!parity64(GB(0,43)) || (hat = GB(28,4)) > 8)
 				return -1;
 
 			dev = sw->dev[0];
@@ -397,7 +381,7 @@ static int sw_parse(unsigned char *buf, struct sw *sw)
 
 		case SW_ID_FFW:
 
-			if (!sw_parity(GB(0,33)))
+			if (!parity64(GB(0,33)))
 				return -1;
 
 			dev = sw->dev[0];
-- 
2.5.0