Vendor specific handling in hid_scan_report() overrides the hid->group
to HID_GROUP_WACOM for all devices with vendor ID equal to
USB_VENDOR_ID_WACOM.
However there is an i2c-hid multitouch compatible Wacom touschreen which
is parsed as generic HID_GROUP_MULTITOUCH_WIN_8 device but
hid-multitouch doesn't probe because of this overriding.
Support this touschreen by overring the group only when the bus is
different than I2C.
Signed-off-by: Jarkko Nikula <jarkko.nikula@xxxxxxxxxxxxxxx>
---
I'm not an HID expert and I don't know is there any existing Wacom
tablets using the I2C bus. There are USB and Bluetooth tablets so that's
the reason I'm checking id->bus != BUS_I2C when overring the group.
I've done only basic testing that device is registered as an
hid-multitouch device and "hexdump /dev/input/eventX" produces a bunch
of hexadecimals when touschscreen is touched.
---
drivers/hid/hid-core.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
index d162f0dc76e3..cfb0b7262de7 100644
--- a/drivers/hid/hid-core.c
+++ b/drivers/hid/hid-core.c
@@ -816,7 +816,8 @@ static int hid_scan_report(struct hid_device *hid)
*/
switch (hid->vendor) {
case USB_VENDOR_ID_WACOM:
- hid->group = HID_GROUP_WACOM;
+ if (hid->bus != BUS_I2C)
+ hid->group = HID_GROUP_WACOM;
break;
case USB_VENDOR_ID_SYNAPTICS:
if (hid->group == HID_GROUP_GENERIC)
--
2.11.0
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