From 3eb07b1fdb869c3fd264a1ddbf0b6f341db57883 Mon Sep 17 00:00:00 2001
From: Jens Peters <jp7677@gmail.com>
Date: Mon, 19 Jan 2026 20:42:42 +0100
Subject: [PATCH] backend/libinput: expose libinput_tablet_tool

Exposing libinput_tablet_tool from libinput allows compositors
to set tool specific configuration options like pressure range
and eraser button behavior.

See 'libinput_tablet_tool_*()' functions which require a
'libinput_tablet_tool' handle:
https://wayland.freedesktop.org/libinput/doc/1.30.0/api/group__config.html
(libinput 1.30.0, latest at the time of writing).
---
 backend/libinput/tablet_tool.c | 10 ++++++++++
 include/wlr/backend/libinput.h |  6 ++++++
 2 files changed, 16 insertions(+)

diff --git a/backend/libinput/tablet_tool.c b/backend/libinput/tablet_tool.c
index d43c6cd0a..b2430a445 100644
--- a/backend/libinput/tablet_tool.c
+++ b/backend/libinput/tablet_tool.c
@@ -18,6 +18,16 @@ const struct wlr_tablet_impl libinput_tablet_impl = {
 	.name = "libinput-tablet-tool",
 };
 
+struct libinput_tablet_tool *wlr_libinput_get_tablet_tool_handle(
+		struct wlr_tablet_tool *wlr_tablet_tool) {
+
+	struct tablet_tool *tool =
+		wl_container_of(wlr_tablet_tool, tool, wlr_tool);
+
+	assert(tool);
+	return tool->handle;
+}
+
 void init_device_tablet(struct wlr_libinput_input_device *dev) {
 	const char *name = get_libinput_device_name(dev->handle);
 	struct wlr_tablet *wlr_tablet = &dev->tablet;
diff --git a/include/wlr/backend/libinput.h b/include/wlr/backend/libinput.h
index 663f71acd..2a4e1996e 100644
--- a/include/wlr/backend/libinput.h
+++ b/include/wlr/backend/libinput.h
@@ -15,6 +15,7 @@
 #include <wlr/backend/session.h>
 
 struct wlr_input_device;
+struct wlr_tablet_tool;
 
 struct wlr_backend *wlr_libinput_backend_create(struct wlr_session *session);
 /**
@@ -22,6 +23,11 @@ struct wlr_backend *wlr_libinput_backend_create(struct wlr_session *session);
  */
 struct libinput_device *wlr_libinput_get_device_handle(
 		struct wlr_input_device *dev);
+/**
+ * Gets the underlying struct libinput_tablet_tool handle for the given tablet tool.
+ */
+struct libinput_tablet_tool *wlr_libinput_get_tablet_tool_handle(
+		struct wlr_tablet_tool *wlr_tablet_tool);
 
 bool wlr_backend_is_libinput(struct wlr_backend *backend);
 bool wlr_input_device_is_libinput(struct wlr_input_device *device);