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

Message ID 1450301856-7253-1-git-send-email-killertofu@gmail.com (mailing list archive)
State New, archived
Delegated to: Jiri Kosina
Headers show

Commit Message

Gerecke, Jason Dec. 16, 2015, 9:37 p.m. UTC
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(-)

Comments

Jiri Kosina Dec. 17, 2015, 11:04 p.m. UTC | #1
I've applied the series to for-4.5/wacom.

Thanks,
diff mbox

Patch

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)) |