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#include <assert.h>
#include <libinput.h>
#include <stdlib.h>
#include <stdio.h>
#include <wlr/backend/interface.h>
#include <wlr/backend/session.h>
#include <wlr/util/log.h>
#include "backend/libinput.h"
#include "util/signal.h"
static struct wlr_libinput_backend *get_libinput_backend_from_backend(
struct wlr_backend *wlr_backend) {
assert(wlr_backend_is_libinput(wlr_backend));
return (struct wlr_libinput_backend *)wlr_backend;
}
static int libinput_open_restricted(const char *path,
int flags, void *_backend) {
struct wlr_libinput_backend *backend = _backend;
struct wlr_device *dev = wlr_session_open_file(backend->session, path);
if (dev == NULL) {
return -1;
}
return dev->fd;
}
static void libinput_close_restricted(int fd, void *_backend) {
struct wlr_libinput_backend *backend = _backend;
struct wlr_device *dev;
bool found = false;
wl_list_for_each(dev, &backend->session->devices, link) {
if (dev->fd == fd) {
found = true;
break;
}
}
if (found) {
wlr_session_close_file(backend->session, dev);
}
}
static const struct libinput_interface libinput_impl = {
.open_restricted = libinput_open_restricted,
.close_restricted = libinput_close_restricted
};
static int handle_libinput_readable(int fd, uint32_t mask, void *_backend) {
struct wlr_libinput_backend *backend = _backend;
int ret = libinput_dispatch(backend->libinput_context);
if (ret != 0) {
wlr_log(WLR_ERROR, "Failed to dispatch libinput: %s", strerror(-ret));
wl_display_terminate(backend->display);
return 0;
}
struct libinput_event *event;
while ((event = libinput_get_event(backend->libinput_context))) {
handle_libinput_event(backend, event);
libinput_event_destroy(event);
}
return 0;
}
static enum wlr_log_importance libinput_log_priority_to_wlr(
enum libinput_log_priority priority) {
switch (priority) {
case LIBINPUT_LOG_PRIORITY_ERROR:
return WLR_ERROR;
case LIBINPUT_LOG_PRIORITY_INFO:
return WLR_INFO;
default:
return WLR_DEBUG;
}
}
static void log_libinput(struct libinput *libinput_context,
enum libinput_log_priority priority, const char *fmt, va_list args) {
enum wlr_log_importance importance = libinput_log_priority_to_wlr(priority);
static char wlr_fmt[1024];
snprintf(wlr_fmt, sizeof(wlr_fmt), "[libinput] %s", fmt);
_wlr_vlog(importance, wlr_fmt, args);
}
static bool backend_start(struct wlr_backend *wlr_backend) {
struct wlr_libinput_backend *backend =
get_libinput_backend_from_backend(wlr_backend);
wlr_log(WLR_DEBUG, "Starting libinput backend");
backend->libinput_context = libinput_udev_create_context(&libinput_impl,
backend, backend->session->udev);
if (!backend->libinput_context) {
wlr_log(WLR_ERROR, "Failed to create libinput context");
return false;
}
if (libinput_udev_assign_seat(backend->libinput_context,
backend->session->seat) != 0) {
wlr_log(WLR_ERROR, "Failed to assign libinput seat");
return false;
}
// TODO: More sophisticated logging
libinput_log_set_handler(backend->libinput_context, log_libinput);
libinput_log_set_priority(backend->libinput_context, LIBINPUT_LOG_PRIORITY_ERROR);
int libinput_fd = libinput_get_fd(backend->libinput_context);
char *no_devs = getenv("WLR_LIBINPUT_NO_DEVICES");
if (no_devs) {
if (strcmp(no_devs, "1") != 0) {
no_devs = NULL;
}
}
if (!no_devs && backend->wlr_device_lists.size == 0) {
handle_libinput_readable(libinput_fd, WL_EVENT_READABLE, backend);
if (backend->wlr_device_lists.size == 0) {
wlr_log(WLR_ERROR, "libinput initialization failed, no input devices");
wlr_log(WLR_ERROR, "Set WLR_LIBINPUT_NO_DEVICES=1 to suppress this check");
return false;
}
}
struct wl_event_loop *event_loop =
wl_display_get_event_loop(backend->display);
if (backend->input_event) {
wl_event_source_remove(backend->input_event);
}
backend->input_event = wl_event_loop_add_fd(event_loop, libinput_fd,
WL_EVENT_READABLE, handle_libinput_readable, backend);
if (!backend->input_event) {
wlr_log(WLR_ERROR, "Failed to create input event on event loop");
return false;
}
wlr_log(WLR_DEBUG, "libinput successfully initialized");
return true;
}
static void backend_destroy(struct wlr_backend *wlr_backend) {
if (!wlr_backend) {
return;
}
struct wlr_libinput_backend *backend =
get_libinput_backend_from_backend(wlr_backend);
struct wl_list **wlr_devices_ptr;
wl_array_for_each(wlr_devices_ptr, &backend->wlr_device_lists) {
struct wlr_libinput_input_device *dev, *tmp;
wl_list_for_each_safe(dev, tmp, *wlr_devices_ptr, link) {
destroy_libinput_input_device(dev);
}
free(*wlr_devices_ptr);
}
wlr_backend_finish(wlr_backend);
wl_list_remove(&backend->display_destroy.link);
wl_list_remove(&backend->session_destroy.link);
wl_list_remove(&backend->session_signal.link);
wl_array_release(&backend->wlr_device_lists);
if (backend->input_event) {
wl_event_source_remove(backend->input_event);
}
libinput_unref(backend->libinput_context);
free(backend);
}
static const struct wlr_backend_impl backend_impl = {
.start = backend_start,
.destroy = backend_destroy,
};
bool wlr_backend_is_libinput(struct wlr_backend *b) {
return b->impl == &backend_impl;
}
static void session_signal(struct wl_listener *listener, void *data) {
struct wlr_libinput_backend *backend =
wl_container_of(listener, backend, session_signal);
struct wlr_session *session = backend->session;
if (!backend->libinput_context) {
return;
}
if (session->active) {
libinput_resume(backend->libinput_context);
} else {
libinput_suspend(backend->libinput_context);
}
}
static void handle_session_destroy(struct wl_listener *listener, void *data) {
struct wlr_libinput_backend *backend =
wl_container_of(listener, backend, session_destroy);
backend_destroy(&backend->backend);
}
static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_libinput_backend *backend =
wl_container_of(listener, backend, display_destroy);
backend_destroy(&backend->backend);
}
struct wlr_backend *wlr_libinput_backend_create(struct wl_display *display,
struct wlr_session *session) {
struct wlr_libinput_backend *backend =
calloc(1, sizeof(struct wlr_libinput_backend));
if (!backend) {
wlr_log(WLR_ERROR, "Allocation failed: %s", strerror(errno));
return NULL;
}
wlr_backend_init(&backend->backend, &backend_impl);
wl_array_init(&backend->wlr_device_lists);
backend->session = session;
backend->display = display;
backend->session_signal.notify = session_signal;
wl_signal_add(&session->events.active, &backend->session_signal);
backend->session_destroy.notify = handle_session_destroy;
wl_signal_add(&session->events.destroy, &backend->session_destroy);
backend->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &backend->display_destroy);
return &backend->backend;
}
struct libinput_device *wlr_libinput_get_device_handle(
struct wlr_input_device *wlr_dev) {
struct wlr_libinput_input_device *dev =
(struct wlr_libinput_input_device *)wlr_dev;
return dev->handle;
}
uint32_t usec_to_msec(uint64_t usec) {
return (uint32_t)(usec / 1000);
}
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