xpadneo, profiles: Report current profile as depressed button

This way, user-space can figure out which profile currently is
configured. Take note that this may also involve a different button
mapping, and only profile 0 has paddles forcibly reported as their
distinct events (otherwise mapped to A, B, X, and Y by default).

Link: atar-axis#428
Signed-off-by: Kai Krakow <kai@kaishome.de>

hid-xpadneo/src/hid-xpadneo.c

@@ -906,6 +906,13 @@ static int xpadneo_input_configured(struct hid_device *hdev, struct hid_input *h
 		__set_bit(BTN_PADDLES(3), xdata->gamepad->keybit);
 	}
 
+	/* expose current profile as buttons */
+	__set_bit(BTN_PROFILES(0), xdata->gamepad->keybit);
+	__set_bit(BTN_PROFILES(1), xdata->gamepad->keybit);
+	__set_bit(BTN_PROFILES(2), xdata->gamepad->keybit);
+	__set_bit(BTN_PROFILES(3), xdata->gamepad->keybit);
+	input_report_key(xdata->gamepad, BTN_PROFILES(0), 1);
+
 	return 0;
 }
 
@@ -1026,6 +1033,14 @@ static int xpadneo_event(struct hid_device *hdev, struct hid_field *field,
 	}
 
 stop_processing:
+	/* report the profile change */
+	if (xdata->last_profile != xdata->profile) {
+		if (xdata->last_profile < 4)
+			input_report_key(gamepad, BTN_PROFILES(xdata->last_profile), 0);
+		input_report_key(gamepad, BTN_PROFILES(xdata->profile), 1);
+		xdata->last_profile = xdata->profile;
+	}
+
 	return 1;
 }
 

hid-xpadneo/src/xpadneo.h

@@ -48,9 +48,10 @@ do { \
 } while (0)
 
 /* button aliases */
-#define BTN_PADDLES(b) (BTN_TRIGGER_HAPPY5+(b))
-#define BTN_SHARE      KEY_F12
-#define BTN_XBOX       BTN_MODE
+#define BTN_PROFILES(b) (BTN_TRIGGER_HAPPY33+(b))
+#define BTN_PADDLES(b)  (BTN_TRIGGER_HAPPY5+(b))
+#define BTN_SHARE       KEY_F12
+#define BTN_XBOX        BTN_MODE
 
 /* module parameter "trigger_rumble_mode" */
 #define PARAM_TRIGGER_RUMBLE_PRESSURE 0
@@ -152,7 +153,7 @@ struct xpadneo_devdata {
 
 	/* profile switching */
 	bool xbox_button_down, profile_switched;
-	u8 profile;
+	u8 last_profile, profile;
 
 	/* mouse mode */
 	bool mouse_mode;