[PATCH] HID: wacom: fix Bamboo ONE oops

From: Benjamin Tissoires
Date: Fri Mar 25 2016 - 10:27:09 EST

Looks like recent changes in the Wacom driver made the Bamboo ONE crashes.
The tablet behaves as if it was a regular Bamboo device with pen, touch
and pad, but there is no physical pad connected to it.
The weird part is that the pad is still sending events and given that
there is no input node connected to it, we get anull pointer exception.

Link: https://bugzilla.redhat.com/show_bug.cgi?id=1317116

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@xxxxxxxxxx>
Hi Jiri,

This fixes the oopses we saw on the Bamboo ONE.
The fedora user is fine, and it appears the sourceforge user too, as the
problems were due to misconfigurations on his end.


drivers/hid/wacom_wac.c | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
index bd198bb..02c4efe 100644
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -2426,6 +2426,17 @@ void wacom_setup_device_quirks(struct wacom *wacom)

+ * Hack for the Bamboo One:
+ * the device presents a PAD/Touch interface as most Bamboos and even
+ * sends ghosts PAD data on it. However, later, we must disable this
+ * ghost interface, and we can not detect it unless we set it here
+ */
+ if (features->type == BAMBOO_PEN &&
+ features->pktlen == WACOM_PKGLEN_BBTOUCH3)
+ features->device_type |= WACOM_DEVICETYPE_PAD;
+ /*
* Raw Wacom-mode pen and touch events both come from interface
* 0, whose HID descriptor has an application usage of 0xFF0D
* (i.e., WACOM_VENDORDEFINED_PEN). We route pen packets back