HID: wacom: Correct touch maximum XY of 2nd-gen Intuos

[ Upstream commit 3b8d573586d1b9dee33edf6cb6f2ca05f4bca568 ]

The touch sensors on the 2nd-gen Intuos tablets don't use a 4096x4096
sensor like other similar tablets (3rd-gen Bamboo, Intuos5, etc.).
The incorrect maximum XY values don't normally affect userspace since
touch input from these devices is typically relative rather than
absolute. It does, however, cause problems when absolute distances
need to be measured, e.g. for gesture recognition. Since the resolution
of the touch sensor on these devices is 10 units / mm (versus 100 for
the pen sensor), the proper maximum values can be calculated by simply
dividing by 10.

Fixes: b5fd2a3e92 ("Input: wacom - add support for three new Intuos devices")
Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c
index c401b5b63f4c59c696acfcd21c6943b00b75ae54..4c72e68637c2831848df7c3fdaee8201b651f4d0 100644 (file)
--- a/drivers/hid/wacom_wac.c
+++ b/drivers/hid/wacom_wac.c
@@ -3212,8 +3212,14 @@ void wacom_setup_device_quirks(struct wacom *wacom)
                        if (features->type >= INTUOSHT && features->type <= BAMBOO_PT)
                                features->device_type |= WACOM_DEVICETYPE_PAD;
 
-                       features->x_max = 4096;
-                       features->y_max = 4096;
+                       if (features->type == INTUOSHT2) {
+                               features->x_max = features->x_max / 10;
+                               features->y_max = features->y_max / 10;
+                       }
+                       else {
+                               features->x_max = 4096;
+                               features->y_max = 4096;
+                       }
                }
                else if (features->pktlen == WACOM_PKGLEN_BBTOUCH) {
                        features->device_type |= WACOM_DEVICETYPE_PAD;