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/* Copyright 2016 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.
*
* gru battery LED control - derived from standard policy with PWM
* color control rather than GPIO.
*/
#include "battery.h"
#include "charge_state.h"
#include "chipset.h"
#include "hooks.h"
#include "led_common.h"
#include "lid_switch.h"
#include "pwm.h"
#include "util.h"
#define GRU_BAT_LED_PWM PWM_CH_LED_RED
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_AMBER,
LED_GREEN,
LED_COLOR_COUNT /* Number of colors, not a color itself */
};
/* One LED active at a time. PWM low period determines which LED is active. */
static const int led_color_to_pwm_duty[LED_COLOR_COUNT] = {
[LED_OFF] = 100,
[LED_RED] = 0,
[LED_AMBER] = 80,
[LED_GREEN] = 85,
};
static int bat_led_set_color(enum led_color color)
{
pwm_set_duty(GRU_BAT_LED_PWM, led_color_to_pwm_duty[color]);
return EC_SUCCESS;
}
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_RED] = 1;
brightness_range[EC_LED_COLOR_AMBER] = 1;
brightness_range[EC_LED_COLOR_GREEN] = 1;
break;
default:
/* ignore */
break;
}
}
int led_set_brightness(enum ec_led_id led_id, const uint8_t *brightness)
{
switch (led_id) {
case EC_LED_ID_BATTERY_LED:
if (brightness[EC_LED_COLOR_RED] != 0)
bat_led_set_color(LED_RED);
else if (brightness[EC_LED_COLOR_AMBER] != 0)
bat_led_set_color(LED_AMBER);
else if (brightness[EC_LED_COLOR_GREEN] != 0)
bat_led_set_color(LED_GREEN);
else
bat_led_set_color(LED_OFF);
break;
default:
return EC_ERROR_UNKNOWN;
}
return EC_SUCCESS;
}
static void gru_led_set_battery(void)
{
static int battery_second;
uint32_t chflags = charge_get_flags();
battery_second++;
/*
* BAT LED behavior: Follow chromeos specification.
* Green/Amber for CHARGE_FLAG_FORCE_IDLE
*/
switch (charge_get_state()) {
case PWR_STATE_CHARGE:
bat_led_set_color(LED_AMBER);
break;
case PWR_STATE_DISCHARGE:
if (charge_get_percent() < 3)
bat_led_set_color((battery_second & 1)
? LED_OFF : LED_AMBER);
else if (charge_get_percent() < 10)
bat_led_set_color((battery_second & 3)
? LED_OFF : LED_AMBER);
else
bat_led_set_color(LED_OFF);
break;
case PWR_STATE_ERROR:
bat_led_set_color((battery_second & 1) ? LED_OFF : LED_RED);
break;
case PWR_STATE_CHARGE_NEAR_FULL:
bat_led_set_color(LED_GREEN);
break;
case PWR_STATE_IDLE: /* External power connected in IDLE. */
if (chflags & CHARGE_FLAG_FORCE_IDLE)
bat_led_set_color(
(battery_second & 0x2) ? LED_GREEN : LED_AMBER);
else
bat_led_set_color(LED_GREEN);
break;
default:
/* Other states don't alter LED behavior */
break;
}
}
/* Called by hook task every 1 sec */
static void led_second(void)
{
if (led_auto_control_is_enabled(EC_LED_ID_BATTERY_LED))
gru_led_set_battery();
}
DECLARE_HOOK(HOOK_SECOND, led_second, HOOK_PRIO_DEFAULT);
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