From c0981a55d9ff41cea99a32ba8dd53b562ca0d5b0 Mon Sep 17 00:00:00 2001
From: NiLuJe <ninuje@gmail.com>
Date: Wed, 9 Dec 2020 00:16:43 +0100
Subject: [PATCH] Make sure KindlePowerD's __gc metamethod will actually be
 called * Via the newproxy hack.

---
 frontend/device/kindle/powerd.lua | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/frontend/device/kindle/powerd.lua b/frontend/device/kindle/powerd.lua
index 15140089a..cff22e6e3 100644
--- a/frontend/device/kindle/powerd.lua
+++ b/frontend/device/kindle/powerd.lua
@@ -125,13 +125,19 @@ function KindlePowerD:isChargingHW()
     return is_charging == 1
 end
 
-function KindlePowerD:__gc()
+local KindlePowerD_mt = {}
+function KindlePowerD_mt:__gc()
     if self.lipc_handle then
         self.lipc_handle:close()
         self.lipc_handle = nil
     end
 end
 
+-- Funky ass newproxy() workaround to make __gc work on a plain table in Lua 5.1/LuaJIT
+-- c.f., https://github.com/katlogic/__gc
+local setmetatable = require("ffi/__gc")
+setmetatable(KindlePowerD, KindlePowerD_mt)
+
 function KindlePowerD:_readFLIntensity()
     return self:read_int_file(self.fl_intensity_file)
 end