Add core LED handling

Similar to how we deal with modifiers, also add LED handling to the core
input code, with a callout into the backends to update them when they
change.

Signed-off-by: Daniel Stone <daniel@fooishbar.org>

src/compositor.c

@@ -1733,6 +1733,7 @@ update_modifier_state(struct weston_seat *seat, uint32_t key, uint32_t state)
 {
 	uint32_t mods_depressed, mods_latched, mods_locked, group;
 	uint32_t mods_lookup;
+	enum weston_led leds = 0;
 	int ret = 0;
 
 	/* First update the XKB state object with the keypress. */
@@ -1771,6 +1772,20 @@ update_modifier_state(struct weston_seat *seat, uint32_t key, uint32_t state)
 	if ((mods_lookup & seat->compositor->xkb_info.super_mod))
 		seat->modifier_state |= MODIFIER_SUPER;
 
+	/* Finally, notify the compositor that LEDs have changed. */
+	if (xkb_state_led_index_is_active(seat->xkb_state.state,
+					  seat->compositor->xkb_info.num_led))
+		leds |= LED_NUM_LOCK;
+	if (xkb_state_led_index_is_active(seat->xkb_state.state,
+					  seat->compositor->xkb_info.caps_led))
+		leds |= LED_CAPS_LOCK;
+	if (xkb_state_led_index_is_active(seat->xkb_state.state,
+					  seat->compositor->xkb_info.scroll_led))
+		leds |= LED_SCROLL_LOCK;
+	if (leds != seat->xkb_state.leds && seat->led_update)
+		seat->led_update(seat, seat->xkb_state.leds);
+	seat->xkb_state.leds = leds;
+
 	return ret;
 }
 
@@ -2237,6 +2252,13 @@ static int weston_compositor_xkb_init(struct weston_compositor *ec,
 	ec->xkb_info.super_mod = xkb_map_mod_get_index(ec->xkb_info.keymap,
 						       XKB_MOD_NAME_LOGO);
 
+	ec->xkb_info.num_led = xkb_map_led_get_index(ec->xkb_info.keymap,
+						     XKB_LED_NAME_NUM);
+	ec->xkb_info.caps_led = xkb_map_led_get_index(ec->xkb_info.keymap,
+						      XKB_LED_NAME_CAPS);
+	ec->xkb_info.scroll_led = xkb_map_led_get_index(ec->xkb_info.keymap,
+						        XKB_LED_NAME_SCROLL);
+
 	return 0;
 }
 

src/compositor.h

@@ -54,6 +54,12 @@ enum weston_keyboard_modifier {
 	MODIFIER_SUPER = (1 << 2),
 };
 
+enum weston_led {
+	LED_NUM_LOCK = (1 << 0),
+	LED_CAPS_LOCK = (1 << 1),
+	LED_SCROLL_LOCK = (1 << 2),
+};
+
 struct weston_mode {
 	uint32_t flags;
 	int32_t width, height;
@@ -180,12 +186,15 @@ struct weston_seat {
 
 	struct wl_listener new_drag_icon_listener;
 
+	void (*led_update)(struct weston_seat *ws, enum weston_led leds);
+
 	struct {
 		struct xkb_state *state;
 		uint32_t mods_depressed;
 		uint32_t mods_latched;
 		uint32_t mods_locked;
 		uint32_t group;
+		enum weston_led leds;
 	} xkb_state;
 };
 
@@ -308,6 +317,9 @@ struct weston_compositor {
 		xkb_mod_index_t ctrl_mod;
 		xkb_mod_index_t alt_mod;
 		xkb_mod_index_t super_mod;
+		xkb_led_index_t num_led;
+		xkb_led_index_t caps_led;
+		xkb_led_index_t scroll_led;
 	} xkb_info;
 };