1 # Copyright (c) 2012 The Chromium OS Authors. All rights reserved. 2 # Use of this source code is governed by a BSD-style license that can be 3 # found in the LICENSE file. 4 5 6 # DESCRIPTION : 7 # 8 # This is a hardware test for Probing I2C device. The test uses i2cdetect 9 # utility to check if there's an device on specific bus. 10 11 12 import re 13 import logging 14 15 from autotest_lib.client.bin import test, utils 16 from autotest_lib.client.common_lib import error 17 18 19 def i2c_detect(bus, addr): 20 full_cmd = 'i2cdetect -y %d 0x%x 0x%x' % (bus, addr, addr) 21 result = utils.system_output(full_cmd) 22 logging.debug('Command: %s', full_cmd) 23 logging.debug('Result: %s', result) 24 return result 25 26 def i2c_probe(bus, addr): 27 response = i2c_detect(bus, addr) 28 return (re.search('^\d\d:\s+(UU|[0-9a-f]{2})', response, re.MULTILINE) is 29 not None) 30 31 class hardware_I2CProbe(test.test): 32 version = 1 33 34 def run_once(self, bus, addr): 35 if not i2c_probe(bus, addr): 36 raise error.TestError('No I2C device on bus %d addr 0x%x' % 37 (bus, addr)) 38
