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/* Copyright (c) 2013 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 Rambi
*/
#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_POWER_LED};
const int supported_led_ids_count = ARRAY_SIZE(supported_led_ids);
enum led_color {
LED_OFF = 0,
LED_RED,
LED_YELLOW,
LED_GREEN,
LED_DIM_GREEN,
/* 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},
{40, 80},
{0, 100},
{0, 10},
};
/**
* Set LED color
*
* @param color Enumerated color value
*/
static void set_color(enum led_color color)
{
pwm_set_duty(PWM_CH_LED_RED, color_brightness[color][0]);
pwm_set_duty(PWM_CH_LED_GREEN, color_brightness[color][1]);
}
void led_get_brightness_range(enum ec_led_id led_id, uint8_t *brightness_range)
{
brightness_range[EC_LED_COLOR_RED] = 100;
brightness_range[EC_LED_COLOR_GREEN] = 100;
}
int led_set_brightness(enum ec_led_id led_id, const uint8_t *brightness)
{
pwm_set_duty(PWM_CH_LED_RED, brightness[EC_LED_COLOR_RED]);
pwm_set_duty(PWM_CH_LED_GREEN, brightness[EC_LED_COLOR_GREEN]);
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_RED, 1);
pwm_enable(PWM_CH_LED_GREEN, 1);
set_color(LED_OFF);
}
DECLARE_HOOK(HOOK_INIT, led_init, HOOK_PRIO_DEFAULT);
/**
* Called by hook task every 250 ms
*/
static void led_tick(void)
{
static int suspended_prev;
static unsigned ticks;
int blink_on;
int suspended = chipset_in_state(CHIPSET_STATE_SUSPEND);
int chstate = charge_get_state();
/* If we don't control the LED, nothing to do */
if (!led_auto_control_is_enabled(EC_LED_ID_POWER_LED))
return;
/* If we're just suspending now, reset ticks so LED changes quickly */
if (suspended && !suspended_prev)
ticks = 0;
else
ticks++;
suspended_prev = suspended;
/* Blink with 25% duty cycle, 4 sec period */
blink_on = ticks % 16 < 4;
/* If charging error, blink red */
if (chstate == PWR_STATE_ERROR) {
set_color(blink_on ? LED_RED : LED_OFF);
return;
}
/* If charge-force-idle, blink green, 50% duty cycle, 2 sec period */
if (chstate == PWR_STATE_IDLE &&
(charge_get_flags() & CHARGE_FLAG_FORCE_IDLE)) {
set_color((ticks & 0x4) ? LED_GREEN : LED_OFF);
return;
}
/*
* If the system is charging, solid yellow.
*
* Note that this means you can't distinguish power states
* (on/suspend/off) when the system is charging.
*/
if (chstate == PWR_STATE_CHARGE) {
set_color(LED_YELLOW);
return;
}
/* If suspended, blink yellow */
if (suspended) {
set_color(blink_on ? LED_YELLOW : LED_OFF);
return;
}
/* If AC connected and fully charged (or close to it), solid green */
if (chstate == PWR_STATE_CHARGE_NEAR_FULL ||
chstate == PWR_STATE_IDLE) {
set_color(LED_GREEN);
return;
}
/* If powered on, dim green (just as an indicator we're on) */
if (chipset_in_state(CHIPSET_STATE_ON)) {
set_color(LED_DIM_GREEN);
return;
}
/* Otherwise, system is off and AC not connected, LED off */
set_color(LED_OFF);
}
DECLARE_HOOK(HOOK_TICK, led_tick, HOOK_PRIO_DEFAULT);
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