HID: quirks: Allow inverting the absolute X/Y values

Add a HID_QUIRK_X_INVERT/HID_QUIRK_Y_INVERT quirk that can be used to invert the X/Y values. Signed-off-by: Alistair Francis <[email protected]> [bentiss: silence checkpatch warning] Signed-off-by: Benjamin Tissoires <[email protected]> Link: https://lore.kernel.org/r/[email protected]
raspberrypi · Dec 14, 2021 · fd8d135 · fd8d135
1 parent 9ea1b35
commit fd8d135
Show file tree

Hide file tree

Showing 2 changed files with 8 additions and 0 deletions.
diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
@@ -1329,6 +1329,12 @@ void hidinput_hid_event(struct hid_device *hid, struct hid_field *field, struct
 
 	input = field->hidinput->input;
 
+	if (usage->type == EV_ABS &&
+	    (((*quirks & HID_QUIRK_X_INVERT) && usage->code == ABS_X) ||
+	     ((*quirks & HID_QUIRK_Y_INVERT) && usage->code == ABS_Y))) {
+		value = field->logical_maximum - value;
+	}
+
 	if (usage->hat_min < usage->hat_max || usage->hat_dir) {
 		int hat_dir = usage->hat_dir;
 		if (!hat_dir)

diff --git a/include/linux/hid.h b/include/linux/hid.h
@@ -359,6 +359,8 @@ struct hid_item {
 /* BIT(9) reserved for backward compatibility, was NO_INIT_INPUT_REPORTS */
 #define HID_QUIRK_ALWAYS_POLL			BIT(10)
 #define HID_QUIRK_INPUT_PER_APP			BIT(11)
+#define HID_QUIRK_X_INVERT			BIT(12)
+#define HID_QUIRK_Y_INVERT			BIT(13)
 #define HID_QUIRK_SKIP_OUTPUT_REPORTS		BIT(16)
 #define HID_QUIRK_SKIP_OUTPUT_REPORT_ID		BIT(17)
 #define HID_QUIRK_NO_OUTPUT_REPORTS_ON_INTR_EP	BIT(18)