| # Copyright 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. |
| |
| import time |
| |
| import power_state |
| |
| |
| class stormPower(power_state.PowerStateDriver): |
| """Driver for power_state for storm-derived boards.""" |
| |
| # Time in seconds to allow the firmware to detect the 'rec_mode' signal |
| # after cold reset. How long holding the recovery button has different |
| # meanings: |
| # > 8 seconds, < 16 seconds: power wash |
| # > 16 seconds: enter recovery mode |
| _RECOVERY_DETECTION_DELAY = 20 |
| |
| def _power_on_rec(self): |
| """Power on in recovery mode.""" |
| self._interface.set('rec_mode', self.REC_ON) |
| self._reset_cycle() |
| time.sleep(self._RECOVERY_DETECTION_DELAY) |
| self._interface.set('rec_mode', self.REC_OFF) |
| |
| def _power_on_normal(self): |
| """Power on in normal mode, i.e., no recovery.""" |
| self._interface.set('rec_mode', self.REC_OFF) |
| time.sleep(self._RECOVERY_DETECTION_DELAY) |
| self._reset_cycle() |
| |
| def _power_on(self, rec_mode): |
| if rec_mode == self.REC_ON: |
| self._power_on_rec() |
| else: |
| self._power_on_normal() |
| |
| def _power_off(self): |
| # There is no way turn off power on storm, so we hold cold_reset to on |
| # so the host acts as if it's off. |
| self._interface.set('cold_reset', 'on') |
