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)

1 files changed, 85 insertions, 0 deletions

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);
+}