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/* Copyright 2022 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.
*/
#include "battery.h"
#include "charge_manager.h"
#include "charge_state.h"
#include "chipset.h"
#include "common.h"
#include "console.h"
#include "ec_commands.h"
#include "extpower.h"
#include "hooks.h"
#include "led_common.h"
#include "led_pwm.h"
#include "pwm.h"
#include "timer.h"
#include "util.h"
/* Battery percentage thresholds to blink at different rates. */
#define LOW_BATTERY_PERCENTAGE 10
#define NORMAL_BATTERY_PERCENTAGE 90
#define LED_OFF -1
#define LED_PULSE_TICK (125 * MSEC)
#define LED_FAST_PULSE_PERIOD (250 / 125) /* 250 ms */
#define LED_SLOW_PULSE_PERIOD ((2 * MSEC) / 125) /* 2 sec */
struct led_pulse_data {
bool led_is_pulsing;
uint8_t led_pulse_period;
uint8_t led_tick_count;
};
static struct led_pulse_data rvp_led[CONFIG_LED_PWM_COUNT];
static void pulse_led_deferred(void);
DECLARE_DEFERRED(pulse_led_deferred);
static void pulse_led_deferred(void)
{
int i = 0;
bool call_deferred = false;
for (i = 0; i < CONFIG_LED_PWM_COUNT; i++) {
if (!rvp_led[i].led_is_pulsing) {
rvp_led[i].led_tick_count = 0;
continue;
}
/*
* LED will be in ON state first half of the pulse period
* and in OFF state in second half of the pulse period.
*/
if (rvp_led[i].led_tick_count <
(rvp_led[i].led_pulse_period >> 1))
set_pwm_led_color(i, EC_LED_COLOR_GREEN);
else
set_pwm_led_color(i, LED_OFF);
rvp_led[i].led_tick_count = (rvp_led[i].led_tick_count + 1) %
rvp_led[i].led_pulse_period;
call_deferred = true;
}
if (call_deferred)
hook_call_deferred(&pulse_led_deferred_data, LED_PULSE_TICK);
}
static void pulse_leds(enum pwm_led_id id, int period)
{
rvp_led[id].led_pulse_period = period;
rvp_led[id].led_is_pulsing = true;
pulse_led_deferred();
}
static void update_charger_led(enum pwm_led_id id)
{
enum charge_state chg_st = charge_get_state();
/*
* The colors listed below are the default, but can be overridden.
*
* Fast Flash = Charging error
* Slow Flash = Discharging
* LED on = Charging
* LED off = No Charger connected
*/
if (chg_st == PWR_STATE_CHARGE ||
chg_st == PWR_STATE_CHARGE_NEAR_FULL) {
/* Charging: LED ON */
rvp_led[id].led_is_pulsing = false;
set_pwm_led_color(id, EC_LED_COLOR_GREEN);
} else if (chg_st == PWR_STATE_DISCHARGE ||
chg_st == PWR_STATE_DISCHARGE_FULL) {
if (extpower_is_present()) {
/* Discharging:
* Flash slower (2 second period, 100% duty cycle)
*/
pulse_leds(id, LED_SLOW_PULSE_PERIOD);
} else {
/* No Charger connected: LED OFF */
rvp_led[id].led_is_pulsing = false;
set_pwm_led_color(id, LED_OFF);
}
} else if (chg_st == PWR_STATE_ERROR) {
/* Charging error:
* Flash faster (250 ms period, 100% duty cycle)
*/
pulse_leds(id, LED_FAST_PULSE_PERIOD);
} else {
/* LED OFF */
rvp_led[id].led_is_pulsing = false;
set_pwm_led_color(id, LED_OFF);
}
}
static void update_battery_led(enum pwm_led_id id)
{
/*
* Fast Flash = Low Battery
* Slow Flash = Normal Battery
* LED on = Full Battery
* LED off = No Battery
*/
if (battery_is_present() == BP_YES) {
int batt_percentage = charge_get_percent();
if (batt_percentage < LOW_BATTERY_PERCENTAGE) {
/* Low Battery:
* Flash faster (250 ms period, 100% duty cycle)
*/
pulse_leds(id, LED_FAST_PULSE_PERIOD);
} else if (batt_percentage < NORMAL_BATTERY_PERCENTAGE) {
/* Normal Battery:
* Flash slower (2 second period, 100% duty cycle)
*/
pulse_leds(id, LED_SLOW_PULSE_PERIOD);
} else {
/* Full Battery: LED ON */
rvp_led[id].led_is_pulsing = false;
set_pwm_led_color(id, EC_LED_COLOR_GREEN);
}
} else {
/* No Battery: LED OFF */
rvp_led[id].led_is_pulsing = false;
set_pwm_led_color(id, LED_OFF);
}
}
static void init_rvp_leds_off(void)
{
/* Turn off LEDs such that they are in a known state with zero duty. */
set_pwm_led_color(PWM_LED0, LED_OFF);
set_pwm_led_color(PWM_LED1, LED_OFF);
}
DECLARE_HOOK(HOOK_INIT, init_rvp_leds_off, HOOK_PRIO_POST_PWM);
static void update_led(void)
{
update_battery_led(PWM_LED0);
update_charger_led(PWM_LED1);
}
DECLARE_HOOK(HOOK_SECOND, update_led, HOOK_PRIO_DEFAULT);
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