[PATCH 1/4] HID: wacom: Limit touchstrip data to 13 bits

[Jason Gerecke <killertofu@gmail.com>]

Commit c7f0522 uses sixteen bits of data in the construction of 'strip1'
and 'strip2'. This can cause problems in some cases, however, since some
tablets store flags in the MSB of data[2] and data[4] that should not be
included in these values. This restores the 0x1f mask that used prior
to c7f0522.

Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
---
 drivers/hid/wacom_wac.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
index 22d3225..cf87810 100644
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -545,8 +545,8 @@ static int wacom_intuos_pad(struct wacom_wac *wacom)
 			          ((data[6] & 0x0F) << 4)  |
 			          (data[5] & 0x0F);
 		}
-		strip1 = (data[1] << 8) | data[2];
-		strip2 = (data[3] << 8) | data[4];
+		strip1 = ((data[1] & 0x1f) << 8) | data[2];
+		strip2 = ((data[3] & 0x1f) << 8) | data[4];
 	}
 
 	prox = (buttons & ~(~0 << nbuttons)) | (keys & ~(~0 << nkeys)) |
-- 
2.6.3