Monitor Embedded Controller (EC) on Linux via ACPI calls through acpi_call kernel module

monitor_ec.py

#!/usr/bin/env python

"""Dump a range of Embedded Controller memory via ACPI. Requires "acpi_call" kernel module to be loaded. By HorstBaerbel (https://github.com/HorstBaerbel) in 2018."""

import re
import sys
import time
import argparse

output = '\033[0m'
values = {}

def auto_int(x):
    return int(x, 0)

def stdout_print(s):
	global output
	output += s

def stdout_clr():
	global output
	output = '\033[0m'

def stdout_flush():
	global output
	sys.stdout.write(output)
	sys.stdout.flush()

def stdout_color(color):
	stdout_print('\033[{}m'.format(color))

def call_acpi(command):
    with open('/proc/acpi/call', 'w') as acpi_call:
        acpi_call.write(command)
        acpi_call.close()
    with open('/proc/acpi/call') as acpi_call:
        response = acpi_call.read()
        acpi_call.close()
	return response

def monitor_ec(startaddr, endaddr, interval):
	global values
	for addr in range(startaddr, endaddr+1):
		values[addr - startaddr] = '-- '
	while True:
		stdout_clr()
		stdout_print(' Base   ')
		for byteAddr in range(0, 16):
			stdout_print('{0:02X} '.format(byteAddr))
		stdout_print('\n--------')
		for byteAddr in range(0, 16):
			stdout_print('---')
		stdout_print('\n')
		counter = 0;
		for addr in range(startaddr, endaddr+1):
			cmd = '\_SB.PCI0.LPCB.EC0.RRAM {}'.format(hex(addr))
			result = call_acpi(cmd)
			if (counter == 0):
				stdout_color(0)
				stdout_print('0x{0:04X}: '.format(addr))
			value = '-- '
			if (len(result) > 0):
				value = '{0:02X} '.format(int(result.split('\x00')[0], 16))
			if (values[addr - startaddr] != value):
				values[addr - startaddr] = value
				stdout_color(91)
			else:
				stdout_color(0)
			stdout_print(value)
			counter += 1
			if (counter == 16):
				counter = 0
				stdout_print('\n')
		stdout_flush();
		time.sleep(interval)

def main():
	parser = argparse.ArgumentParser()
	parser.add_argument('start', type=auto_int, default=0x500, help='Start adress of the range in hex (e.g. 0x500)')
	parser.add_argument('end', type=auto_int, default=0x5ff, help='End adress of the range in hex (e.g. 0x5ff)')
	parser.add_argument('-i', '--interval', type=float, default=1.0, help='Update interval in seconds (e.g. 1.5)')
	args = parser.parse_args()
	try:
		monitor_ec(args.start, args.end, args.interval)
	except (KeyboardInterrupt, SystemExit):
		sys.exit();

if __name__ == '__main__':
	main()