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8f118e0167
Each device keeps track of the last known state. If device_set_state updates the device state to a new known state, then return true. Cr50 uses this returned value to check if the state has changed instead of calculating it itself. BUG=none BRANCH=none TEST=device detection still works Change-Id: I8afac178c2c731def6f4f62ff7023fe169ec1479 Signed-off-by: Mary Ruthven <mruthven@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/430970 Reviewed-by: Aaron Durbin <adurbin@chromium.org>
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
/* Copyright 2016 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gpio.h"
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#ifndef __CROS_DEVICE_STATE_H
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#define __CROS_DEVICE_STATE_H
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/* Device state indexes */
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enum device_state {
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DEVICE_STATE_UNKNOWN = 0,
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DEVICE_STATE_OFF,
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DEVICE_STATE_ON,
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DEVICE_STATE_COUNT,
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};
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struct device_config {
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const char *name; /* Device name */
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enum device_state state; /* Device status */
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enum device_state last_known_state; /* Either off or on */
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/* Deferred handler to detect power off */
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const struct deferred_data *deferred;
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enum gpio_signal detect; /* GPIO detecting power on */
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};
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enum device_type;
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extern struct device_config device_states[];
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/* Return the device state */
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int device_get_state(enum device_type device);
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/**
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* Sets the device state
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*
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* @param device the device to update
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* @param state the new device state
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* @return true if the last_known_state was changed
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*/
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int device_set_state(enum device_type device, enum device_state state);
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/* Update the device state based on the device gpios */
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void board_update_device_state(enum device_type device);
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#endif /* __CROS_DEVICE_STATE_H */
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