Input: elantech - correct x, y value range for v2 hardware

x, y values are actually 12-bit long. Also update protocol document to
reflect the change.

Signed-off-by: JJ Ding <jj_ding@emc.com.tw>
Acked-by: Daniel Kurtz <djkurtz@chromium.org>
Acked-by: Éric Piel <eric.piel@tremplin-utc.net>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 4 insertions, 4 deletions

diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
index 32503565faf9..da161dae3502 100644
--- a/drivers/input/mouse/elantech.c
+++ b/drivers/input/mouse/elantech.c
@@ -290,15 +290,15 @@ static void elantech_report_absolute_v2(struct psmouse *psmouse)
                 /* pass through... */
         case 1:
                 /*
-                 * byte 1:  .   .   .   .   .  x10 x9  x8
+                 * byte 1:  .   .   .   .  x11 x10 x9  x8
                  * byte 2: x7  x6  x5  x4  x4  x2  x1  x0
                  */
-                x1 = ((packet[1] & 0x07) << 8) | packet[2];
+                x1 = ((packet[1] & 0x0f) << 8) | packet[2];
                 /*
-                 * byte 4:  .   .   .   .   .   .  y9  y8
+                 * byte 4:  .   .   .   .  y11 y10 y9  y8
                  * byte 5: y7  y6  y5  y4  y3  y2  y1  y0
                  */
-                y1 = ETP_YMAX_V2 - (((packet[4] & 0x03) << 8) | packet[5]);
+                y1 = ETP_YMAX_V2 - (((packet[4] & 0x0f) << 8) | packet[5]);
 
                 input_report_abs(dev, ABS_X, x1);
                 input_report_abs(dev, ABS_Y, y1);