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/* 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.
*
* Battery LED control for Clapper
*/
#include "charge_state.h"
#include "chipset.h"
#include "gpio.h"
#include "hooks.h"
#include "led_common.h"
#include "pwm.h"
#include "util.h"
const enum ec_led_id supported_led_ids[] = {
EC_LED_ID_BATTERY_LED, EC_LED_ID_POWER_LED};
const int supported_led_ids_count = ARRAY_SIZE(supported_led_ids);
enum led_color {
LED_OFF = 0,
LED_AMBER,
LED_WHITE,
/* Number of colors, not a color itself */
LED_COLOR_COUNT
};
/* Brightness vs. color, for {amber, white} LEDs */
static const uint8_t color_brightness[LED_COLOR_COUNT][2] = {
{0, 0},
{100, 0},
{0, 100},
};
/**
* Set battery/charger LED color
*
* @param color Enumerated color value
*/
static void set_color_battery(enum led_color color)
{
pwm_set_duty(PWM_CH_BATTERY_LED_AMBER, color_brightness[color][0]);
pwm_set_duty(PWM_CH_BATTERY_LED_WHITE, color_brightness[color][1]);
}
/**
* Set power LED color
*
* @param color Enumerated color value
*/
static void set_color_power(enum led_color color)
{
/* Setting the color to AMBER is equivalent to OFF */
pwm_set_duty(PWM_CH_POWER_LED_WHITE, color_brightness[color][1]);
}
void led_get_brightness_range(enum ec_led_id led_id, uint8_t *brightness_range)
{
switch (led_id) {
case EC_LED_ID_BATTERY_LED:
brightness_range[EC_LED_COLOR_WHITE] = 100;
brightness_range[EC_LED_COLOR_YELLOW] = 100;
break;
case EC_LED_ID_POWER_LED:
brightness_range[EC_LED_COLOR_WHITE] = 100;
break;
default:
/* Nothing to do */
break;
}
}
int led_set_brightness(enum ec_led_id led_id, const uint8_t *brightness)
{
switch (led_id) {
case EC_LED_ID_BATTERY_LED:
pwm_set_duty(PWM_CH_BATTERY_LED_AMBER,
brightness[EC_LED_COLOR_YELLOW]);
pwm_set_duty(PWM_CH_BATTERY_LED_WHITE,
brightness[EC_LED_COLOR_WHITE]);
break;
case EC_LED_ID_POWER_LED:
pwm_set_duty(PWM_CH_POWER_LED_WHITE,
brightness[EC_LED_COLOR_WHITE]);
break;
default:
break;
}
return EC_SUCCESS;
}
static void power_led_update(void)
{
static unsigned timer;
/* 2 sec */
if (++timer > 20)
timer = 0;
/* S5 */
if (chipset_in_state(CHIPSET_STATE_ANY_OFF)) {
set_color_power(LED_OFF);
/* S3 */
} else if (chipset_in_state(CHIPSET_STATE_SUSPEND)) {
/* Flashing 1 sec on, 1 sec off */
set_color_power((timer <= 10) ? LED_OFF : LED_WHITE);
/* S0 */
} else if (chipset_in_state(CHIPSET_STATE_ON)) {
set_color_power(LED_WHITE);
}
}
static void battery_led_update(void)
{
static unsigned timer;
unsigned battery = charge_get_percent();
/* least common multiple : 15, 33, 51 */
if (++timer == 2805)
timer = 0;
switch (charge_get_state()) {
case PWR_STATE_CHARGE:
case PWR_STATE_CHARGE_NEAR_FULL: /* with AC */
case PWR_STATE_IDLE: /* with AC */
/* OS display 80% ~ 100% */
if (battery >= 78)
set_color_battery(LED_WHITE);
/* OS display 20% ~ 79% */
else if (battery >= 23 && battery < 78) {
/* 5000 ms on */
if (timer%51 < 50)
set_color_battery(LED_WHITE);
/* 100 ms off */
else
set_color_battery(LED_OFF);
}
/* OS display 5% ~ 19% */
else if (battery >= 9 && battery < 23) {
/* 3200 ms on */
if (timer%33 < 32)
set_color_battery(LED_AMBER);
/* 100 ms off */
else
set_color_battery(LED_OFF);
}
/* OS display 0% ~ 4% */
else {
/* 1000 ms on */
if (timer%15 < 10)
set_color_battery(LED_AMBER);
/* 500 ms off */
else
set_color_battery(LED_OFF);
}
break;
case PWR_STATE_DISCHARGE: /* without AC */
/* not S0 */
if (!chipset_in_state(CHIPSET_STATE_ON))
set_color_battery(LED_OFF);
/* OS display 20% ~ 100% */
else if (battery >= 23)
set_color_battery(LED_WHITE);
/* OS display 5% ~ 19% */
else if (battery >= 9 && battery < 23)
set_color_battery(LED_AMBER);
/* OS display 0% ~ 4% */
else {
/* 1000 ms on */
if (timer%15 < 10)
set_color_battery(LED_AMBER);
/* 500 ms off */
else
set_color_battery(LED_OFF);
}
break;
default:
/* Other states don't alter LED behavior */
break;
}
}
/**
* Called every 100 ms
*/
static void led_update(void)
{
if (led_auto_control_is_enabled(EC_LED_ID_POWER_LED))
power_led_update();
if (led_auto_control_is_enabled(EC_LED_ID_BATTERY_LED))
battery_led_update();
hook_call_deferred(led_update, 100 * MSEC);
}
DECLARE_DEFERRED(led_update);
static void led_init(void)
{
/* Configure GPIOs */
gpio_config_module(MODULE_PWM_LED, 1);
/*
* Enable PWMs and set to 0% duty cycle. If they're disabled, the LM4
* seems to ground the pins instead of letting them float.
*/
pwm_enable(PWM_CH_BATTERY_LED_AMBER, 1);
pwm_enable(PWM_CH_BATTERY_LED_WHITE, 1);
pwm_enable(PWM_CH_POWER_LED_WHITE, 1);
set_color_battery(LED_OFF);
set_color_power(LED_OFF);
hook_call_deferred(led_update, 0);
}
DECLARE_HOOK(HOOK_INIT, led_init, HOOK_PRIO_DEFAULT);
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