| # Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
| # Use of this source code is governed by a BSD-style license that can be |
| # found in the LICENSE file. |
| |
| |
| # DESCRIPTION : |
| # |
| # This is a hardware test for Probing I2C device. The test uses i2cdetect |
| # utility to check if there's an device on specific bus. |
| |
| |
| import re |
| import logging |
| |
| from autotest_lib.client.bin import test, utils |
| from autotest_lib.client.common_lib import error |
| |
| |
| def i2c_detect(bus, addr): |
| full_cmd = 'i2cdetect -y %d 0x%x 0x%x' % (bus, addr, addr) |
| result = utils.system_output(full_cmd) |
| logging.debug('Command: %s', full_cmd) |
| logging.debug('Result: %s', result) |
| return result |
| |
| def i2c_probe(bus, addr): |
| response = i2c_detect(bus, addr) |
| return (re.search('^\d\d:\s+(UU|[0-9a-f]{2})', response, re.MULTILINE) is |
| not None) |
| |
| class hardware_I2CProbe(test.test): |
| version = 1 |
| |
| def run_once(self, bus, addr): |
| if not i2c_probe(bus, addr): |
| raise error.TestError('No I2C device on bus %d addr 0x%x' % |
| (bus, addr)) |
