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>

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);