#!/usr/bin/lua

-- Created by jiaqiang.ye@lnxall.com
-- Refer to `reset_modem function in `/lib/dyiot/bin/get_hardware
-- 2023/05/09

local posix = require "posix"
local invoker = require "invoker"

local function reset_ttyusb()
	local mdev = invoker.readfile('/tmp/4g_modem_tty', invoker.TRIMEND)
	if type(mdev) ~= 'string' or #mdev == 0 then
		io.stderr:write("Error, failed to read /tmp/4g_modem_tty\n")
		io.stderr:flush()
		return false
	end

	if posix.access(mdev) ~= 0 then
		io.stderr:write(string.format("Error, 4g_modem_tty not found: '%s'\n", mdev))
		io.stderr:flush()
		return false
	end

	posix.setenv('TTY_READ', '0', true)
	if invoker.invoke(0, 'tty_rw', mdev, "AT+RESET\r\n") ~= 0 then
		io.stderr:write("Error, failed to reset ttyUSB!\n")
		io.stderr:flush()
		return false
	end
	return true
end

local function reload_gpio()
	local board = invoker.readfile('/tmp/sysinfo/board_name', invoker.TRIMEND)
	if board ~= 'WOOLINK-MT7628-128M-32M' then return false end

	io.stderr:write("Warning, reload 4G modem GPIO...\n")
	invoker.invoke(invoker.NOSTDIO, '/bin/sh', '-c', 'echo 5 >/sys/class/gpio/export')
	invoker.invoke(invoker.NOSTDIO, '/bin/sh', '-c', 'echo out >/sys/class/gpio/gpio5/direction')
	invoker.invoke(invoker.NOSTDIO, '/bin/sh', '-c', 'echo 0 >/sys/class/gpio/gpio5/value')
	invoker.waitsec(2)
	invoker.invoke(invoker.NOSTDIO, '/bin/sh', '-c', 'echo 1 >/sys/class/gpio/gpio5/value')
	return true
end

reset_ttyusb()
reload_gpio()
os.exit(0)