Initial pass on libinput backend

backend/CMakeLists.txt

@@ -9,11 +9,15 @@ add_library(wlr-backend
     #wayland/registry.c
     #wayland/wl_seat.c
     #wayland/wl_output.c
+
     drm/backend.c
     drm/drm.c
-    udev.c
+
+    libinput/backend.c
+
     backend.c
     egl.c
+    udev.c
 )
 
 target_link_libraries(wlr-backend

backend/libinput/backend.c

@@ -0,0 +1,97 @@
+#include <stdlib.h>
+#include <assert.h>
+#include <libinput.h>
+#include <wlr/session.h>
+#include <wlr/backend/interface.h>
+#include "backend/udev.h"
+#include "backend/libinput/backend.h"
+#include "common/log.h"
+
+static int wlr_libinput_open_restricted(const char *path,
+		int flags, void *_state) {
+	struct wlr_backend_state *state = _state;
+	return wlr_session_open_file(state->session, path);
+}
+
+static void wlr_libinput_close_restricted(int fd, void *_state) {
+	struct wlr_backend_state *state = _state;
+	wlr_session_close_file(state->session, fd);
+}
+
+static const struct libinput_interface libinput_impl = {
+	.open_restricted = wlr_libinput_open_restricted,
+	.close_restricted = wlr_libinput_close_restricted
+};
+
+static int wlr_libinput_handle_event(int fd, uint32_t mask, void *_state) {
+	// TODO
+	return 0;
+}
+
+static void wlr_libinput_log(struct libinput *libinput,
+		enum libinput_log_priority priority, const char *fmt, va_list args) {
+	_wlr_vlog(L_ERROR, fmt, args);
+}
+
+static bool wlr_libinput_backend_init(struct wlr_backend_state *state) {
+	state->handle = libinput_udev_create_context(&libinput_impl, state,
+			state->udev->udev);
+	if (!state->handle) {
+		return false;
+	}
+
+	// TODO: Let user customize seat used
+	if (!libinput_udev_assign_seat(state->handle, "seat0")) {
+		return false;
+	}
+
+	// TODO: More sophisticated logging
+	libinput_log_set_handler(state->handle, wlr_libinput_log);
+	libinput_log_set_priority(state->handle, LIBINPUT_LOG_PRIORITY_ERROR);
+
+	struct wl_event_loop *event_loop =
+		wl_display_get_event_loop(state->display);
+	if (state->input_event) {
+		wl_event_source_remove(state->input_event);
+	}
+	state->input_event = wl_event_loop_add_fd(event_loop,
+			libinput_get_fd(state->handle), WL_EVENT_READABLE,
+			wlr_libinput_handle_event, state);
+	if (!state->input_event) {
+		return false;
+	}
+	return true;
+}
+
+static void wlr_libinput_backend_destroy(struct wlr_backend_state *state) {
+	// TODO
+}
+
+static struct wlr_backend_impl backend_impl = {
+	.init = wlr_libinput_backend_init,
+	.destroy = wlr_libinput_backend_destroy
+};
+
+struct wlr_backend *wlr_libinput_backend_create(struct wl_display *display,
+		struct wlr_session *session, struct wlr_udev *udev) {
+	assert(display && session && udev);
+
+	struct wlr_backend_state *state = calloc(1, sizeof(struct wlr_backend_state));
+	if (!state) {
+		wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
+		return NULL;
+	}
+
+	struct wlr_backend *backend = wlr_backend_create(&backend_impl, state);
+	if (!backend) {
+		wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
+		return NULL;
+	}
+
+	state->backend = backend;
+	state->session = session;
+	state->udev = udev;
+	state->display = display;
+
+	return backend;
+}

include/backend/libinput/backend.h

@@ -0,0 +1,21 @@
+#ifndef _WLR_BACKEND_LIBINPUT_INTERNAL_H
+#define _WLR_BACKEND_LIBINPUT_INTERNAL_H
+#include <libinput.h>
+#include <wlr/backend/interface.h>
+#include <wlr/common/list.h>
+#include <wayland-server-core.h>
+#include "backend/udev.h"
+
+struct wlr_backend_state {
+	struct wlr_backend *backend;
+	struct wlr_session *session;
+	struct wlr_udev *udev;
+	struct wl_display *display;
+
+	struct libinput *handle;
+	struct wl_event_source *input_event;
+
+	list_t *devices;
+};
+
+#endif

include/wlr/session.h

@@ -22,7 +22,7 @@ struct wlr_session {
 struct wlr_session *wlr_session_start(struct wl_display *disp);
 void wlr_session_finish(struct wlr_session *session);
 int wlr_session_open_file(struct wlr_session *restrict session,
-	const char *restrict path);
+		const char *restrict path);
 void wlr_session_close_file(struct wlr_session *session, int fd);
 bool wlr_session_change_vt(struct wlr_session *session, int vt);
 

include/wlr/session/interface.h

@@ -7,7 +7,7 @@ struct session_impl {
 	struct wlr_session *(*start)(struct wl_display *disp);
 	void (*finish)(struct wlr_session *session);
 	int (*open)(struct wlr_session *restrict session,
-		const char *restrict path);
+			const char *restrict path);
 	void (*close)(struct wlr_session *session, int fd);
 	bool (*change_vt)(struct wlr_session *session, int vt);
 };

session/logind.c

@@ -28,8 +28,7 @@ struct logind_session {
 };
 
 static int logind_take_device(struct wlr_session *restrict base,
-	const char *restrict path) {
+		const char *restrict path) {
-
 	struct logind_session *session = wl_container_of(base, session, base);
 
 	int ret;