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)

3 files changed, 146 insertions, 4 deletions

diff --git a/sway/input/input-manager.c b/sway/input/input-manager.c
index f99fc395..adb36af9 100644
--- a/sway/input/input-manager.c
+++ b/sway/input/input-manager.c
@@ -155,6 +155,47 @@ static void input_manager_libinput_reset_keyboard(
 				libinput_device, send_events));
 }
 
+static void input_manager_libinput_config_switch(
+		struct sway_input_device *input_device) {
+	struct wlr_input_device *wlr_device = input_device->wlr_device;
+	struct input_config *ic = input_device_get_config(input_device);
+	struct libinput_device *libinput_device;
+
+	if (!ic || !wlr_input_device_is_libinput(wlr_device)) {
+		return;
+	}
+
+	libinput_device = wlr_libinput_get_device_handle(wlr_device);
+	sway_log(SWAY_DEBUG, "input_manager_libinput_config_switch(%s)",
+		ic->identifier);
+
+	if (ic->send_events != INT_MIN) {
+		sway_log(SWAY_DEBUG, "libinput_config_switch(%s) send_events_set_mode(%d)",
+			ic->identifier, ic->send_events);
+		log_libinput_config_status(libinput_device_config_send_events_set_mode(
+				libinput_device, ic->send_events));
+	}
+}
+
+static void input_manager_libinput_reset_switch(
+		struct sway_input_device *input_device) {
+	struct wlr_input_device *wlr_device = input_device->wlr_device;
+	struct libinput_device *libinput_device;
+
+	if (!wlr_input_device_is_libinput(wlr_device)) {
+		return;
+	}
+
+	libinput_device = wlr_libinput_get_device_handle(wlr_device);
+
+	uint32_t send_events =
+		libinput_device_config_send_events_get_default_mode(libinput_device);
+	sway_log(SWAY_DEBUG, "libinput_reset_switch(%s) send_events_set_mode(%d)",
+		input_device->identifier, send_events);
+	log_libinput_config_status(libinput_device_config_send_events_set_mode(
+				libinput_device, send_events));
+}
+
 static void input_manager_libinput_config_touch(
 		struct sway_input_device *input_device) {
 	struct wlr_input_device *wlr_device = input_device->wlr_device;
@@ -471,6 +512,8 @@ static void handle_new_input(struct wl_listener *listener, void *data) {
 		input_manager_libinput_config_pointer(input_device);
 	} else if (input_device->wlr_device->type == WLR_INPUT_DEVICE_KEYBOARD) {
 		input_manager_libinput_config_keyboard(input_device);
+	} else if (input_device->wlr_device->type == WLR_INPUT_DEVICE_SWITCH) {
+		input_manager_libinput_config_switch(input_device);
 	} else if (input_device->wlr_device->type == WLR_INPUT_DEVICE_TOUCH) {
 		input_manager_libinput_config_touch(input_device);
 	}
@@ -624,6 +667,8 @@ void input_manager_apply_input_config(struct input_config *input_config) {
 				input_manager_libinput_config_pointer(input_device);
 			} else if (input_device->wlr_device->type == WLR_INPUT_DEVICE_KEYBOARD) {
 				input_manager_libinput_config_keyboard(input_device);
+			} else if (input_device->wlr_device->type == WLR_INPUT_DEVICE_SWITCH) {
+				input_manager_libinput_config_switch(input_device);
 			} else if (input_device->wlr_device->type == WLR_INPUT_DEVICE_TOUCH) {
 				input_manager_libinput_config_touch(input_device);
 			}
@@ -642,6 +687,8 @@ void input_manager_reset_input(struct sway_input_device *input_device) {
 		input_manager_libinput_reset_pointer(input_device);
 	} else if (input_device->wlr_device->type == WLR_INPUT_DEVICE_KEYBOARD) {
 		input_manager_libinput_reset_keyboard(input_device);
+	} else if (input_device->wlr_device->type == WLR_INPUT_DEVICE_SWITCH) {
+		input_manager_libinput_reset_switch(input_device);
 	} else if (input_device->wlr_device->type == WLR_INPUT_DEVICE_TOUCH) {
 		input_manager_libinput_reset_touch(input_device);
 	}
diff --git a/sway/input/seat.c b/sway/input/seat.c
index 7fc87ee4..d58ff9e6 100644
--- a/sway/input/seat.c
+++ b/sway/input/seat.c
@@ -15,6 +15,7 @@
 #include "sway/input/input-manager.h"
 #include "sway/input/keyboard.h"
 #include "sway/input/seat.h"
+#include "sway/input/switch.h"
 #include "sway/ipc-server.h"
 #include "sway/layers.h"
 #include "sway/output.h"
@@ -482,8 +483,8 @@ static void seat_update_capabilities(struct sway_seat *seat) {
 		case WLR_INPUT_DEVICE_TABLET_TOOL:
 			caps |= WL_SEAT_CAPABILITY_POINTER;
 			break;
-		case WLR_INPUT_DEVICE_TABLET_PAD:
 		case WLR_INPUT_DEVICE_SWITCH:
+		case WLR_INPUT_DEVICE_TABLET_PAD:
 			break;
 		}
 	}
@@ -570,6 +571,15 @@ static void seat_configure_keyboard(struct sway_seat *seat,
 	}
 }
 
+static void seat_configure_switch(struct sway_seat *seat,
+        struct sway_seat_device *seat_device) {
+	if (!seat_device->switch_device) {
+		sway_switch_create(seat, seat_device);
+	}
+	seat_apply_input_config(seat, seat_device);
+	sway_switch_configure(seat_device->switch_device);
+}
+
 static void seat_configure_touch(struct sway_seat *seat,
 		struct sway_seat_device *sway_device) {
 	wlr_cursor_attach_input_device(seat->cursor->cursor,
@@ -611,6 +621,9 @@ void seat_configure_device(struct sway_seat *seat,
 		case WLR_INPUT_DEVICE_KEYBOARD:
 			seat_configure_keyboard(seat, seat_device);
 			break;
+		case WLR_INPUT_DEVICE_SWITCH:
+			seat_configure_switch(seat, seat_device);
+			break;
 		case WLR_INPUT_DEVICE_TOUCH:
 			seat_configure_touch(seat, seat_device);
 			break;
@@ -620,9 +633,6 @@ void seat_configure_device(struct sway_seat *seat,
 		case WLR_INPUT_DEVICE_TABLET_PAD:
 			sway_log(SWAY_DEBUG, "TODO: configure tablet pad");
 			break;
-		case WLR_INPUT_DEVICE_SWITCH:
-			sway_log(SWAY_DEBUG, "TODO: configure switch device");
-			break;
 	}
 }
 
diff --git a/sway/input/switch.c b/sway/input/switch.c
new file mode 100644
index 00000000..d56e6525
--- /dev/null
+++ b/sway/input/switch.c
@@ -0,0 +1,85 @@
+#include "sway/config.h"
+#include "sway/desktop/transaction.h"
+#include "sway/input/switch.h"
+#include <wlr/types/wlr_idle.h>
+#include "log.h"
+
+struct sway_switch *sway_switch_create(struct sway_seat *seat,
+        struct sway_seat_device *device) {
+    struct sway_switch *switch_device =
+        calloc(1, sizeof(struct sway_switch));
+    if (!sway_assert(switch_device, "could not allocate switch")) {
+        return NULL;
+    }
+    device->switch_device = switch_device;
+    switch_device->seat_device = device;
+    wl_list_init(&switch_device->switch_toggle.link);
+    sway_log(SWAY_DEBUG, "Allocated switch for device");
+
+    return switch_device;
+}
+
+static void handle_switch_toggle(struct wl_listener *listener, void *data) {
+    struct sway_switch *sway_switch =
+            wl_container_of(listener, sway_switch, switch_toggle);
+    struct sway_seat* seat = sway_switch->seat_device->sway_seat;
+    struct wlr_seat *wlr_seat = seat->wlr_seat;
+    struct wlr_input_device *wlr_device =
+        sway_switch->seat_device->input_device->wlr_device;
+
+    wlr_idle_notify_activity(server.idle, wlr_seat);
+    bool input_inhibited = seat->exclusive_client != NULL;
+
+    char *device_identifier = input_device_get_identifier(wlr_device);
+
+    struct wlr_event_switch_toggle *event = data;
+    enum wlr_switch_type type = event->switch_type;
+    enum wlr_switch_state state = event->switch_state;
+    sway_log(SWAY_DEBUG, "%s: type %d state %d", device_identifier, type, state);
+
+    list_t *bindings = config->current_mode->switch_bindings;
+    for (int i = 0; i < bindings->length; ++i) {
+        struct sway_switch_binding *binding = bindings->items[i];
+        if (binding->type != type) {
+            continue;
+        }
+        if (binding->state != WLR_SWITCH_STATE_TOGGLE &&
+                binding->state != state) {
+            continue;
+        }
+        bool binding_locked = binding->flags & BINDING_LOCKED;
+        if (!binding_locked && input_inhibited) {
+            continue;
+        }
+
+        struct sway_binding *dummy_binding = calloc(1, sizeof(struct sway_binding));
+        dummy_binding->type = BINDING_SWITCH;
+        dummy_binding->flags = binding->flags;
+        dummy_binding->command = binding->command;
+
+        seat_execute_command(seat, dummy_binding);
+        free(dummy_binding);
+    }
+
+    transaction_commit_dirty();
+
+    free(device_identifier);
+}
+
+void sway_switch_configure(struct sway_switch *sway_switch) {
+    struct wlr_input_device *wlr_device =
+        sway_switch->seat_device->input_device->wlr_device;
+    wl_list_remove(&sway_switch->switch_toggle.link);
+    wl_signal_add(&wlr_device->switch_device->events.toggle,
+            &sway_switch->switch_toggle);
+    sway_switch->switch_toggle.notify = handle_switch_toggle;
+    sway_log(SWAY_DEBUG, "Configured switch for device");
+}
+
+void sway_switch_destroy(struct sway_switch *sway_switch) {
+    if (!sway_switch) {
+        return;
+    }
+    wl_list_remove(&sway_switch->switch_toggle.link);
+    free(sway_switch);
+}