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/* Copyright (c) 2015 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 Banjo
*/
#include "charge_state.h"
#include "chipset.h"
#include "gpio.h"
#include "hooks.h"
#include "host_command.h"
#include "led_common.h"
#include "pwm.h"
#include "util.h"
#include "extpower.h"
#define CRITICAL_LOW_BATTERY_PERMILLAGE 71
#define LOW_BATTERY_PERMILLAGE 137
#define FULL_BATTERY_PERMILLAGE 937
#define LED_TOTAL_4SECS_TICKS 16
#define LED_TOTAL_2SECS_TICKS 8
#define LED_ON_1SEC_TICKS 4
#define LED_ON_2SECS_TICKS 8
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_ORANGE,
LED_RED,
LED_YELLOW,
LED_BLUE,
/* Number of colors, not a color itself */
LED_COLOR_COUNT
};
/* Brightness vs. color, for {red, green} LEDs */
static const uint8_t color_brightness[LED_COLOR_COUNT][2] = {
{0, 0},
{100, 0},
{30, 45},
{20, 60},
{0, 100},
};
/**
* Set LED color
*
* @param color Enumerated color value
*/
static void set_color_battery_led(enum led_color color)
{
pwm_set_duty(PWM_CH_LED_ORANGE, color_brightness[color][0]);
pwm_set_duty(PWM_CH_LED_BLUE, color_brightness[color][1]);
}
static void set_color_power_led(enum led_color color)
{
pwm_set_duty(PWM_CH_LED_ORANGE_POWER_LED, color_brightness[color][0]);
pwm_set_duty(PWM_CH_LED_BLUE_POWER_LED, color_brightness[color][1]);
}
void led_get_brightness_range(enum ec_led_id led_id, uint8_t *brightness_range)
{
brightness_range[EC_LED_COLOR_YELLOW] = 100;
brightness_range[EC_LED_COLOR_BLUE] = 100;
}
int led_set_brightness(enum ec_led_id led_id, const uint8_t *brightness)
{
if (led_id == EC_LED_ID_POWER_LED) {
pwm_set_duty(PWM_CH_LED_BLUE_POWER_LED,
brightness[EC_LED_COLOR_BLUE]);
pwm_set_duty(PWM_CH_LED_ORANGE_POWER_LED,
brightness[EC_LED_COLOR_YELLOW]);
} else {
pwm_set_duty(PWM_CH_LED_BLUE,
brightness[EC_LED_COLOR_BLUE]);
pwm_set_duty(PWM_CH_LED_ORANGE,
brightness[EC_LED_COLOR_YELLOW]);
}
return EC_SUCCESS;
}
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_LED_ORANGE, 1);
pwm_enable(PWM_CH_LED_BLUE, 1);
pwm_enable(PWM_CH_LED_ORANGE_POWER_LED, 1);
pwm_enable(PWM_CH_LED_BLUE_POWER_LED, 1);
set_color_battery_led(LED_OFF);
set_color_power_led(LED_OFF);
}
DECLARE_HOOK(HOOK_INIT, led_init, HOOK_PRIO_DEFAULT);
/**
* Called by hook task every 250 ms
*/
static void power_led(void)
{
static unsigned int power_ticks;
static int previous_state_suspend;
power_ticks++;
/* If we don't control the LED, nothing to do */
if (!led_auto_control_is_enabled(EC_LED_ID_POWER_LED))
return;
if (chipset_in_state(CHIPSET_STATE_SUSPEND)) {
if (!previous_state_suspend)
power_ticks = 0;
/* Blink once every four seconds. */
set_color_power_led((power_ticks % LED_TOTAL_4SECS_TICKS <
LED_ON_1SEC_TICKS) ? LED_ORANGE : LED_OFF);
previous_state_suspend = 1;
return;
}
previous_state_suspend = 0;
if (chipset_in_state(CHIPSET_STATE_ANY_OFF))
set_color_power_led(LED_OFF);
else if (chipset_in_state(CHIPSET_STATE_ON))
set_color_power_led(LED_BLUE);
}
static void battery_led(void)
{
static unsigned int battery_ticks;
uint32_t chflags = charge_get_flags();
int remaining_capacity;
int full_charge_capacity;
int permillage;
battery_ticks++;
/* If we don't control the LED, nothing to do */
if (!led_auto_control_is_enabled(EC_LED_ID_BATTERY_LED))
return;
remaining_capacity = *(int *)host_get_memmap(EC_MEMMAP_BATT_CAP);
full_charge_capacity = *(int *)host_get_memmap(EC_MEMMAP_BATT_LFCC);
permillage = !full_charge_capacity ? 0 :
(1000 * remaining_capacity) / full_charge_capacity;
switch (charge_get_state()) {
case PWR_STATE_CHARGE:
/* Make the percentage approximate to UI shown */
set_color_battery_led(permillage <
FULL_BATTERY_PERMILLAGE ? LED_ORANGE : LED_BLUE);
break;
case PWR_STATE_CHARGE_NEAR_FULL:
set_color_battery_led(LED_BLUE);
break;
case PWR_STATE_DISCHARGE:
/* Less than 3%, blink one second every two seconds */
if (!chipset_in_state(CHIPSET_STATE_ANY_OFF) &&
permillage <= CRITICAL_LOW_BATTERY_PERMILLAGE)
set_color_battery_led(
(battery_ticks % LED_TOTAL_2SECS_TICKS <
LED_ON_1SEC_TICKS) ? LED_ORANGE : LED_OFF);
/* Less than 10%, blink one second every four seconds */
else if (!chipset_in_state(CHIPSET_STATE_ANY_OFF) &&
permillage <= LOW_BATTERY_PERMILLAGE)
set_color_battery_led(
(battery_ticks % LED_TOTAL_4SECS_TICKS <
LED_ON_1SEC_TICKS) ? LED_ORANGE : LED_OFF);
else
set_color_battery_led(LED_OFF);
break;
case PWR_STATE_ERROR:
set_color_battery_led(
(battery_ticks % LED_TOTAL_2SECS_TICKS <
LED_ON_1SEC_TICKS) ? LED_ORANGE : LED_OFF);
break;
case PWR_STATE_IDLE: /* External power connected in IDLE. */
if (chflags & CHARGE_FLAG_FORCE_IDLE)
set_color_battery_led(
(battery_ticks % LED_TOTAL_4SECS_TICKS <
LED_ON_2SECS_TICKS) ? LED_BLUE : LED_ORANGE);
else
set_color_battery_led(LED_BLUE);
break;
default:
/* Other states don't alter LED behavior */
break;
}
}
static void led_tick(void)
{
battery_led();
power_led();
}
DECLARE_HOOK(HOOK_TICK, led_tick, HOOK_PRIO_DEFAULT);
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