Thread (2 messages) 2 messages, 2 authors, 2015-01-24

Re: [PATCH] input: (gtco) use sign_extend32() for sign extension

From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Date: 2015-01-24 00:47:31
Also in: lkml

On Fri, Jan 23, 2015 at 01:29:36PM +0100, Martin Kepplinger wrote:
Signed-off-by: Martin Kepplinger <martink@posteo.de>
---
Despite it's name, sign_extend32() is safe to use for 8 and 16 bit types too.

Applied, thank you, but I am sure it can be cleaned up even more.
quoted hunk ↗ jump to hunk

 drivers/input/tablet/gtco.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)
diff --git a/drivers/input/tablet/gtco.c b/drivers/input/tablet/gtco.c
index 8580456..272a838 100644
--- a/drivers/input/tablet/gtco.c
+++ b/drivers/input/tablet/gtco.c
@@ -59,7 +59,7 @@ Scott Hill shill@gtcocalcomp.com
 #include <asm/uaccess.h>
 #include <asm/unaligned.h>
 #include <asm/byteorder.h>
-
+#include <linux/bitops.h>
 
 #include <linux/usb/input.h>
 
@@ -666,13 +666,8 @@ static void gtco_urb_callback(struct urb *urbinfo)
 		case 4:
 			/* Tilt */
 
-			/* Sign extend these 7 bit numbers.  */
-			if (device->buffer[6] & 0x40)
-				device->buffer[6] |= 0x80;
-
-			if (device->buffer[7] & 0x40)
-				device->buffer[7] |= 0x80;
-
+			device->buffer[6] = sign_extend32(device->buffer[6], 6);
+			device->buffer[7] = sign_extend32(device->buffer[7], 6);
 
 			valsigned = (device->buffer[6]);
 			input_report_abs(inputdev, ABS_TILT_X, (s32)valsigned);
-- 
2.1.4
-- 
Dmitry
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