| # Copyright (c) 2014 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. |
| """Driver for power_state for daisy boards. |
| """ |
| import time |
| |
| import power_state |
| |
| HOSTEVENT_KEYBOARD_RECOVERY = 0x00004000 |
| |
| class daisyPower(power_state.PowerStateDriver): |
| _EC_CONSOLE_DELAY = 0.4 |
| |
| def _power_off(self): |
| self._cold_reset() |
| time.sleep(self._EC_CONSOLE_DELAY) |
| self._interface.power_long_press() |
| |
| def _power_on(self, rec_mode): |
| if rec_mode == self.REC_ON: |
| # Reset the EC to force it back into RO code; this clears |
| # the EC_IN_RW signal, so the system CPU will trust the |
| # upcoming recovery mode request. |
| self._cold_reset() |
| # Restart the EC, but leave the system CPU off... |
| self._interface.set('ec_uart_cmd', 'reboot ap-off') |
| time.sleep(self._EC_CONSOLE_DELAY) |
| # ... and tell the EC to tell the CPU we're in recovery mode. |
| self._interface.set('ec_uart_cmd', |
| 'hostevent set %#x' % HOSTEVENT_KEYBOARD_RECOVERY) |
| self._interface.power_short_press() |
