Support WLR_INPUT_DEVICE_SWITCH in sway

This commit adds support for laptop lid and tablet
mode switches as provided by evdev/libinput and
handled by wlroots.

Adds a new bindswitch command with syntax:
bindswitch <switch>:<state> <command>

Where <switch> is one of:
tablet for WLR_SWITCH_TYPE_TABLET_MODE
lid for WLR_SWITCH_TYPE_LID

<state> is one of:
on for WLR_SWITCH_STATE_ON
off for WLR_SWITCH_STATE_OFF
toggle for WLR_SWITCH_STATE_TOGGLE

(Note that WLR_SWITCH_STATE_TOGGLE doesn't map to
libinput and will trigger at both on and off events)

4 files changed, 36 insertions, 0 deletions

diff --git a/include/sway/commands.h b/include/sway/commands.h
index 764821a0..1c147c5a 100644
--- a/include/sway/commands.h
+++ b/include/sway/commands.h
@@ -101,6 +101,7 @@ struct sway_container *container_find_resize_parent(struct sway_container *con,
 sway_cmd cmd_assign;
 sway_cmd cmd_bar;
 sway_cmd cmd_bindcode;
+sway_cmd cmd_bindswitch;
 sway_cmd cmd_bindsym;
 sway_cmd cmd_border;
 sway_cmd cmd_client_noop;
diff --git a/include/sway/config.h b/include/sway/config.h
index 7c544541..8970696c 100644
--- a/include/sway/config.h
+++ b/include/sway/config.h
@@ -4,6 +4,7 @@
 #include <stdint.h>
 #include <string.h>
 #include <time.h>
+#include <wlr/interfaces/wlr_switch.h>
 #include <wlr/types/wlr_box.h>
 #include <xkbcommon/xkbcommon.h>
 #include "../include/config.h"
@@ -29,6 +30,7 @@ enum binding_input_type {
         BINDING_KEYSYM,
         BINDING_MOUSECODE,
         BINDING_MOUSESYM,
+        BINDING_SWITCH
 };
 
 enum binding_flags {
@@ -61,6 +63,16 @@ struct sway_mouse_binding {
 };
 
 /**
+ * A laptop switch binding and an associated command.
+ */
+struct sway_switch_binding {
+        enum wlr_switch_type type;
+        enum wlr_switch_state state;
+        uint32_t flags;
+        char *command;
+};
+
+/**
  * Focus on window activation.
  */
 enum sway_fowa {
@@ -78,6 +90,7 @@ struct sway_mode {
         list_t *keysym_bindings;
         list_t *keycode_bindings;
         list_t *mouse_bindings;
+        list_t *switch_bindings;
         bool pango;
 };
 
@@ -603,6 +616,8 @@ int sway_binding_cmp_keys(const void *a, const void *b);
 
 void free_sway_binding(struct sway_binding *sb);
 
+void free_switch_binding(struct sway_switch_binding *binding);
+
 void seat_execute_command(struct sway_seat *seat, struct sway_binding *binding);
 
 void load_swaybar(struct bar_config *bar);
diff --git a/include/sway/input/seat.h b/include/sway/input/seat.h
index a5361e8c..f2af1066 100644
--- a/include/sway/input/seat.h
+++ b/include/sway/input/seat.h
@@ -27,6 +27,7 @@ struct sway_seat_device {
         struct sway_seat *sway_seat;
         struct sway_input_device *input_device;
         struct sway_keyboard *keyboard;
+        struct sway_switch *switch_device;
         struct wl_list link; // sway_seat::devices
 };
 
diff --git a/include/sway/input/switch.h b/include/sway/input/switch.h
new file mode 100644
index 00000000..19bb1e77
--- /dev/null
+++ b/include/sway/input/switch.h
@@ -0,0 +1,19 @@
+#ifndef _SWAY_INPUT_SWITCH_H
+#define _SWAY_INPUT_SWITCH_H
+
+#include "sway/input/seat.h"
+
+struct sway_switch {
+    struct sway_seat_device *seat_device;
+
+    struct wl_listener switch_toggle;
+};
+
+struct sway_switch *sway_switch_create(struct sway_seat *seat,
+        struct sway_seat_device *device);
+
+void sway_switch_configure(struct sway_switch *sway_switch);
+
+void sway_switch_destroy(struct sway_switch *sway_switch);
+
+#endif