/* Copyright 2021 The ChromiumOS Authors
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 *
 * Power and battery LED control.
 */

#include "battery.h"
#include "charge_manager.h"
#include "charge_state.h"
#include "chipset.h"
#include "ec_commands.h"
#include "extpower.h"
#include "gpio.h"
#include "hooks.h"
#include "host_command.h"
#include "led_common.h"
#include "system.h"
#include "util.h"

#define LED_ONE_SEC (1000 / HOOK_TICK_INTERVAL_MS)
/* Battery LED blinks every per 400ms */
#define LED_HALF_ONE_SEC (500 / HOOK_TICK_INTERVAL_MS)

#define BAT_LED_ON 1
#define BAT_LED_OFF 0

const enum ec_led_id supported_led_ids[] = {
	EC_LED_ID_BATTERY_LED,
};

const int supported_led_ids_count = ARRAY_SIZE(supported_led_ids);

enum led_color {
	LED_OFF = 0,
	LED_RED,
	LED_GREEN,
	LED_AMBER,
	LED_COLOR_COUNT /* Number of colors, not a color itself */
};

static void led_set_color(enum led_color color)
{
	gpio_set_level(GPIO_EC_CHG_LED_R_C0,
		       (color == LED_RED) ? BAT_LED_ON : BAT_LED_OFF);
	gpio_set_level(GPIO_EC_CHG_LED_G_C0,
		       (color == LED_GREEN) ? BAT_LED_ON : BAT_LED_OFF);
	if (color == LED_AMBER) {
		gpio_set_level(GPIO_EC_CHG_LED_R_C0, BAT_LED_ON);
		gpio_set_level(GPIO_EC_CHG_LED_G_C0, BAT_LED_ON);
	}
}

void led_get_brightness_range(enum ec_led_id led_id, uint8_t *brightness_range)
{
	brightness_range[EC_LED_COLOR_RED] = 1;
	brightness_range[EC_LED_COLOR_GREEN] = 1;
	brightness_range[EC_LED_COLOR_AMBER] = 1;
}

int led_set_brightness(enum ec_led_id led_id, const uint8_t *brightness)
{
	if (brightness[EC_LED_COLOR_RED] != 0)
		led_set_color(LED_RED);
	else if (brightness[EC_LED_COLOR_GREEN] != 0)
		led_set_color(LED_GREEN);
	else if (brightness[EC_LED_COLOR_AMBER] != 0)
		led_set_color(LED_AMBER);
	else
		led_set_color(LED_OFF);

	return EC_SUCCESS;
}

static void board_led_set_battery(void)
{
	static int battery_ticks;
	int color = LED_OFF;
	int period = 0;
	int percent = DIV_ROUND_NEAREST(charge_get_display_charge(), 10);

	battery_ticks++;

	switch (led_pwr_get_state()) {
	case PWR_STATE_CHARGE:
	case PWR_STATE_CHARGE_NEAR_FULL:
		if (chipset_in_state(CHIPSET_STATE_ON |
				     CHIPSET_STATE_ANY_SUSPEND |
				     CHIPSET_STATE_ANY_OFF)) {
			if (percent <= BATTERY_LEVEL_CRITICAL) {
				/* battery capa <= 5%, Red */
				color = LED_RED;
			} else if (percent > BATTERY_LEVEL_CRITICAL &&
				   percent < CONFIG_BATT_HOST_FULL_FACTOR) {
				/* 5% < battery capa < 97%, Orange */
				color = LED_AMBER;
			} else {
				/* battery capa >= 97%, Green */
				color = LED_GREEN;
			}
		}
		break;
	case PWR_STATE_DISCHARGE:
		/* Always indicate off on when discharging */
		color = LED_OFF;
		break;
	case PWR_STATE_ERROR:
		/* Battery error, Red on 1sec off 1sec */
		period = (1 + 1) * LED_ONE_SEC;
		battery_ticks = battery_ticks % period;
		if (battery_ticks < 1 * LED_ONE_SEC)
			color = LED_RED;
		else
			color = LED_OFF;
		break;
	case PWR_STATE_IDLE: /* External power connected in IDLE */
		color = LED_RED;
		break;
	case PWR_STATE_FORCED_IDLE:
		/* Factory mode, Red 2 sec, green 2 sec */
		period = (2 + 2) * LED_ONE_SEC;
		battery_ticks = battery_ticks % period;
		if (battery_ticks < 2 * LED_ONE_SEC)
			color = LED_RED;
		else
			color = LED_GREEN;
		break;
	default:
		/* Other states don't alter LED behavior */
		break;
	}

	led_set_color(color);
}

/* Called by hook task every TICK */
static void led_tick(void)
{
	if (led_auto_control_is_enabled(EC_LED_ID_BATTERY_LED))
		board_led_set_battery();
}
DECLARE_HOOK(HOOK_TICK, led_tick, HOOK_PRIO_DEFAULT);

void led_control(enum ec_led_id led_id, enum ec_led_state state)
{
	enum led_color color;

	if ((led_id != EC_LED_ID_RECOVERY_HW_REINIT_LED) &&
	    (led_id != EC_LED_ID_SYSRQ_DEBUG_LED))
		return;

	if (state == LED_STATE_RESET) {
		led_auto_control(EC_LED_ID_BATTERY_LED, 1);
		board_led_set_battery();
		return;
	}

	color = state ? LED_RED : LED_OFF;

	led_auto_control(EC_LED_ID_BATTERY_LED, 0);

	led_set_color(color);
}