backend/session: operate on wlr_device

Instead of operating on FDs in {open,close}_device, operate on
wlr_devices. This avoids the device lookup in wlr_session and allows
callers to have access to wlr_device fields.

For now, we use it to remove wlr_session_signal_add and replace it with
a more idiomatic wlr_session.events.change field. In the future, other
events will be added.

3 files changed, 12 insertions, 8 deletions

diff --git a/include/backend/drm/drm.h b/include/backend/drm/drm.h
index 80bc7669..f46d565c 100644
--- a/include/backend/drm/drm.h
+++ b/include/backend/drm/drm.h
@@ -82,6 +82,7 @@ struct wlr_drm_backend {
 	bool addfb2_modifiers;
 
 	int fd;
+	struct wlr_device *dev;
 
 	size_t num_crtcs;
 	struct wlr_drm_crtc *crtcs;
diff --git a/include/wlr/backend/drm.h b/include/wlr/backend/drm.h
index c1380323..cd0f3405 100644
--- a/include/wlr/backend/drm.h
+++ b/include/wlr/backend/drm.h
@@ -22,7 +22,8 @@
  * a DRM backend, other kinds of backends raise SIGABRT).
  */
 struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
-	struct wlr_session *session, int gpu_fd, struct wlr_backend *parent,
+	struct wlr_session *session, struct wlr_device *dev,
+	struct wlr_backend *parent,
 	wlr_renderer_create_func_t create_renderer_func);
 
 bool wlr_backend_is_drm(struct wlr_backend *backend);
diff --git a/include/wlr/backend/session.h b/include/wlr/backend/session.h
index 36b80a8d..82f22a3f 100644
--- a/include/wlr/backend/session.h
+++ b/include/wlr/backend/session.h
@@ -11,9 +11,11 @@ struct session_impl;
 struct wlr_device {
 	int fd;
 	dev_t dev;
-	struct wl_signal signal;
-
 	struct wl_list link;
+
+	struct {
+		struct wl_signal change;
+	} events;
 };
 
 struct wlr_session {
@@ -74,21 +76,21 @@ void wlr_session_destroy(struct wlr_session *session);
  *
  * Returns -errno on error.
  */
-int wlr_session_open_file(struct wlr_session *session, const char *path);
+struct wlr_device *wlr_session_open_file(struct wlr_session *session,
+	const char *path);
 
 /*
  * Closes a file previously opened with wlr_session_open_file.
  */
-void wlr_session_close_file(struct wlr_session *session, int fd);
+void wlr_session_close_file(struct wlr_session *session,
+	struct wlr_device *device);
 
-void wlr_session_signal_add(struct wlr_session *session, int fd,
-	struct wl_listener *listener);
 /*
  * Changes the virtual terminal.
  */
 bool wlr_session_change_vt(struct wlr_session *session, unsigned vt);
 
 size_t wlr_session_find_gpus(struct wlr_session *session,
-	size_t ret_len, int *ret);
+	size_t ret_len, struct wlr_device **ret);
 
 #endif