40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
/* Copyright 2014 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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/* Header for motion_lid.h */
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#ifndef __CROS_EC_MOTION_LID_H
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#define __CROS_EC_MOTION_LID_H
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#include "host_command.h"
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#include "math_util.h"
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/*
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* We will change our tablet mode status when we are "convinced" that it has
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* changed. This means we will have to consecutively calculate our new tablet
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* mode while the angle is stable and come to the same conclusion. The number
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* of consecutive calculations is the debounce count with an interval between
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* readings set by the motion_sense task. This should avoid spurious forces
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* that may trigger false transitions of the tablet mode switch.
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*/
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#define TABLET_MODE_DEBOUNCE_COUNT 3
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/**
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* Get last calculated lid angle. Note, the lid angle calculated by the EC
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* is un-calibrated and is an approximate angle.
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*
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* @return lid angle in degrees in range [0, 360], or LID_ANGLE_UNRELIABLE
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* if the lid angle can't be determined.
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*/
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int motion_lid_get_angle(void);
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enum ec_status host_cmd_motion_lid(struct host_cmd_handler_args *args);
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void motion_lid_calc(void);
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#endif /* __CROS_EC_MOTION_LID_H */
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