Wrap closeAll to clear the fd hashmap

frontend/device/generic/device.lua

@@ -569,7 +569,7 @@ function Device:exit()
     G_reader_settings:close()
 
     -- I/O teardown
-    require("ffi/input"):closeAll()
+    self.input.teardown()
 end
 
 -- Lifted from busybox's libbb/inet_cksum.c

frontend/device/input.lua

@@ -300,7 +300,7 @@ function Input:disableRotationMap()
 end
 
 --[[--
-Wrapper for Lua/C input open.
+Wrapper for our Lua/C input module's open.
 
 Note that we adhere to the "." syntax here for compatibility.
 
@@ -325,7 +325,7 @@ function Input.open(path, name)
 end
 
 --[[--
-Wrapper for Lua/C input close.
+Wrapper for our Lua/C input module's close.
 
 Note that we adhere to the "." syntax here for compatibility.
 --]]
@@ -340,6 +340,16 @@ function Input.close(path)
     end
 end
 
+--[[--
+Wrapper for our Lua/C input module's closeAll.
+
+Note that we adhere to the "." syntax here for compatibility.
+--]]
+function Input.teardown()
+    input.closeAll()
+    Input.opened_devices = {}
+end
+
 --[[--
 Different device models can implement their own hooks and register them.
 --]]

frontend/device/kobo/device.lua

@@ -141,6 +141,7 @@ local Kobo = Generic:extend{
     battery_sysfs = "/sys/class/power_supply/mc13892_bat",
     -- Stable path to the NTX input device
     ntx_dev = "/dev/input/event0",
+    ntx_fd = nil,
     -- Stable path to the Touch input device
     touch_dev = "/dev/input/event1",
     -- Event code to use to detect contact pressure