tools: add tmon package

Add the 'tmon' packages. This is as a tool to help visualize,
tune, and test the complex thermal subsystem.

We get a compile warning for the tool that the printf format does not
fit. This commit contains a patch that fixes this warning. This patch
has also been sent upstream to the Linux kernel [1].

Links:
[1] https://lore.kernel.org/all/20231204141335.2798194-1-fe@dev.tdt.de/

Signed-off-by: Florian Eckert <fe@dev.tdt.de>

package/devel/tmon/Makefile

@@ -0,0 +1,53 @@
+include $(TOPDIR)/rules.mk
+include $(INCLUDE_DIR)/kernel.mk
+
+PKG_NAME:=tmon
+PKG_VERSION:=$(LINUX_VERSION)
+PKG_RELEASE:=1
+
+PKG_MAINTAINER:=Florian Eckert <fe@dev.tdt.de>
+PKG_LICENSE:=GPL-2.0-only
+
+include $(INCLUDE_DIR)/package.mk
+
+define Package/tmon
+  SECTION:=devel
+  CATEGORY:=Development
+  TITLE:=Thermal monitoring and testing tool
+  VERSION:=$(LINUX_VERSION)-$(PKG_RELEASE)
+  URL:=http://www.kernel.org
+  DEPENDS:=+libncursesw
+endef
+
+define Package/tmon/description
+  As hardware vendors cope with the thermal constraints on their products,
+  more and more sensors are added, new cooling capabilities are introduced.
+  To expose such relationship to the userspace, Linux generic thermal layer
+  introduced sysfs entry at /sys/class/thermal with a matrix of symbolic
+  links, trip point bindings, and device instances. To traverse such
+  matrix by hand is not a trivial task.
+  'TMON' is conceived as a tool to help visualize, tune, and test the
+  complex thermal subsystem.
+endef
+
+MAKE_FLAGS = \
+	ARCH="$(LINUX_KARCH)" \
+	CROSS_COMPILE="$(TARGET_CROSS)" \
+	CC="$(TARGET_CC)" \
+	CFLAGS="$(TARGET_CFLAGS) $(TARGET_CPPFLAGS)" \
+	LDFLAGS="$(TARGET_LDFLAGS)"
+
+define Build/Compile
+	-$(MAKE) clean \
+		-C $(LINUX_DIR)/tools/thermal/tmon
+	+$(MAKE_FLAGS) $(MAKE) \
+		-C $(LINUX_DIR)/tools/thermal/tmon
+endef
+
+define Package/tmon/install
+	$(INSTALL_DIR) $(1)/usr/bin
+	$(INSTALL_BIN) $(LINUX_DIR)/tools/thermal/tmon/tmon \
+		$(1)/usr/bin/
+endef
+
+$(eval $(call BuildPackage,tmon))