[PATCH] HID: wacom: Declare tool ID 0x84a as an Intuos eraser

The eraser end of the 8K pen available for the MobileStudio Pro has a tool
ID of 0x84a. The 'wacom_intuos_get_tool_type' function does not currently
recognize this ID, causing it to return BTN_TOOL_PEN rather than
BTN_TOOL_RUBBER. This does not cause a problem for the MobileStudio Pro
since, as a HID_GENERIC device, the driver relies on the state of the
HID_DG_INVERT usage instead. It would, however, cause problems if the pen
is used with devices that use the traditional 'wacom_intuos_irq' codepath
instead.

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

diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
index 0723ba8..55857bf 100644
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c

@@ -645,6 +645,7 @@ static int wacom_intuos_get_tool_type(int tool_id)
 		break;
 
 	case 0x82a: /* Eraser */
+	case 0x84a:
 	case 0x85a:
 	case 0x91a:
 	case 0xd1a:

-- 
2.10.2