blob: ca7e7d4ef764254e85b102628161ff9feac9a8a3 [file] [log] [blame]
# Copyright 2016 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.
import fw_wp_state
import pty_driver
class fwWpCcdError(Exception):
"""Exception class for fwWpCcd."""
class fwWpCcd(fw_wp_state.FwWpStateDriver, pty_driver.ptyDriver):
"""Driver for fw_wp_state for boards with CCD."""
def __init__(self, interface, params):
interface: driver interface object
params: dictionary of params
super(fwWpCcd, self).__init__(interface, params)
def _force_on(self):
"""Force the firmware to write-protected."""
self._issue_cmd("wp on")
def _force_off(self):
"""Force the firmware to not write-protected."""
self._issue_cmd("wp off")
def _reset(self):
"""Reset the firmware write-protection state to the system value."""
# The WP is totally controlled by CCD chip. Do nothing to reset.
def _get_state(self):
"""Get the firmware write-protection state."""
# The output string is defined in ec/board/cr50/wp.c
result = self._issue_cmd_get_results(
"wp", ["Flash WP is (enabled|disabled)"])[0]
if result is None:
raise fwWpCcdError("Cannot retrieve wp result on CCD console.")
if result[1] == "enabled":
return self._STATE_FORCE_ON
return self._STATE_FORCE_OFF