HID: input: force generic axis to be mapped to their user space axis

Atmel 840B digitizer presents a stylus interface which reports twice
the X coordinate and then twice the Y coordinate. In its current
implementation, hid-input assign the first X to X, then the second to Y,
then the first Y to Z, then the second one to RX.

This is wrong, and X should always be mapped to X, no matter what.
A solution consists in forcing X, Y, Z, RX, RY, RZ to be mapped to their
correct user space counter part.

Reported-by: Éric Brunet <Eric.Brunet@lps.ens.fr>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
index 2619f7f..2df7fdd 100644 (file)
--- a/drivers/hid/hid-input.c
+++ b/drivers/hid/hid-input.c
@@ -599,6 +599,12 @@ static void hidinput_configure_usage(struct hid_input *hidinput, struct hid_fiel
                /* These usage IDs map directly to the usage codes. */
                case HID_GD_X: case HID_GD_Y: case HID_GD_Z:
                case HID_GD_RX: case HID_GD_RY: case HID_GD_RZ:
+                       if (field->flags & HID_MAIN_ITEM_RELATIVE)
+                               map_rel(usage->hid & 0xf);
+                       else
+                               map_abs_clear(usage->hid & 0xf);
+                       break;
+
                case HID_GD_SLIDER: case HID_GD_DIAL: case HID_GD_WHEEL:
                        if (field->flags & HID_MAIN_ITEM_RELATIVE)
                                map_rel(usage->hid & 0xf);