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81d269dc00
When ALS is enabled, if light is around one threshold (say 40 lux),
the lightbar will flicker between readings.
Add a histeresis to prevent the flickering.
The current setting is:
setting ^
(dim) 2 | ------+---->---+
1 | +----<---+--->---+
(bright) 0 | +---<---+---------
+-------+--------+-------+--------> lux
20 40 60
BRANCH=smaug
BUG=chrome-os-partner:44400
TEST=check in a dark room (30~40 lux) there is no flickering.
Add unit test.
Change-Id: I4018e2c2ed764abf9c9ed28e2d50a3e94a7d5f75
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/308205
71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
/* Copyright (c) 2012 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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/* Ask the EC to set the lightbar state to reflect the CPU activity */
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#ifndef __CROS_EC_LIGHTBAR_H
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#define __CROS_EC_LIGHTBAR_H
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/****************************************************************************/
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/* Internal stuff */
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/* Define the types of sequences */
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#define LBMSG(state) LIGHTBAR_##state
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#include "lightbar_msg_list.h"
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enum lightbar_sequence {
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LIGHTBAR_MSG_LIST
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LIGHTBAR_NUM_SEQUENCES
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};
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#undef LBMSG
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/* Bytecode field constants */
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enum lb_color {
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LB_COL_RED,
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LB_COL_GREEN,
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LB_COL_BLUE,
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LB_COL_ALL
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};
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enum lb_control {
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LB_CONT_COLOR0,
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LB_CONT_COLOR1,
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LB_CONT_PHASE,
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LB_CONT_MAX
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};
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#ifdef CONFIG_ALS_LIGHTBAR_DIMMING
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/*
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* For dimming the lightbar in the dark, we define an array to
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* describe the expected colors:
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* if luminosity is more than 'lux_up', the color defined will be used.
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* if luminosity is more than 'lux_down', we will look at the next band.
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* The last entry must have lux == 0.
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* Defining brightness is not enough to prevent washed color in low
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* lux setting.
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*/
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struct lb_brightness_def {
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uint16_t lux_up;
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uint16_t lux_down;
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struct rgb_s color[4];
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};
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extern const struct lb_brightness_def lb_brightness_levels[];
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extern const unsigned lb_brightness_levels_count;
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#endif
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/* Request a preset sequence from the lightbar task. */
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void lightbar_sequence_f(enum lightbar_sequence num, const char *f);
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#define lightbar_sequence(A) lightbar_sequence_f(A, __func__)
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/****************************************************************************/
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/* External stuff */
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/* These are used for demo purposes */
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#define DEMO_MODE_DEFAULT 0
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extern void demo_battery_level(int inc);
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extern void demo_is_charging(int ischarge);
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extern void demo_brightness(int inc);
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extern void demo_tap(void);
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#endif /* __CROS_EC_LIGHTBAR_H */
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