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/* Copyright 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.
*
* Power/Battery LED control for Strago
*/
#include "charge_state.h"
#include "chipset.h"
#include "console.h"
#include "extpower.h"
#include "gpio.h"
#include "hooks.h"
#include "led_common.h"
#include "pwm.h"
#include "registers.h"
#include "util.h"
#define CPRINTF(format, args...) cprintf(CC_PWM, format, ## args)
#define CPRINTS(format, args...) cprints(CC_PWM, format, ## args)
#define LED_TOTAL_TICKS 16
#define LED_ON_TICKS 4
static int led_debug;
const enum ec_led_id supported_led_ids[] = {
EC_LED_ID_POWER_LED, 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,
/* Number of colors, not a color itself */
LED_COLOR_COUNT
};
/* Brightness vs. color, in the order of off, red, amber, and green */
static const uint8_t color_brightness[LED_COLOR_COUNT][3] = {
/* {Red, Blue, Green}, */
[LED_OFF] = { 0, 0, 0},
[LED_RED] = {100, 0, 0},
[LED_AMBER] = { 75, 0, 10},
[LED_GREEN] = { 0, 0, 100},
};
/**
* 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_BLUE, color_brightness[color][1]);
pwm_set_duty(PWM_CH_LED_GREEN, color_brightness[color][2]);
}
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_BLUE] = 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_BLUE, brightness[EC_LED_COLOR_BLUE]);
pwm_set_duty(PWM_CH_LED_GREEN, brightness[EC_LED_COLOR_GREEN]);
return EC_SUCCESS;
}
static void strago_led_set_power(void)
{
static int power_ticks;
static int previous_state_suspend;
power_ticks++;
if (chipset_in_state(CHIPSET_STATE_SUSPEND)) {
/* Reset ticks if entering suspend so LED turns amber
* as soon as possible. */
if (!previous_state_suspend)
power_ticks = 0;
/* Blink once every four seconds. */
set_color(
(power_ticks % LED_TOTAL_TICKS) < LED_ON_TICKS ?
LED_AMBER : LED_OFF);
previous_state_suspend = 1;
return;
}
previous_state_suspend = 0;
if (chipset_in_state(CHIPSET_STATE_ANY_OFF))
set_color(LED_OFF);
else if (chipset_in_state(CHIPSET_STATE_ON))
set_color(LED_GREEN);
}
static void strago_led_set_battery(void)
{
static int battery_ticks;
battery_ticks++;
switch (charge_get_state()) {
case PWR_STATE_CHARGE:
set_color(LED_AMBER);
break;
case PWR_STATE_ERROR:
set_color(LED_RED);
break;
case PWR_STATE_CHARGE_NEAR_FULL:
case PWR_STATE_IDLE: /* External power connected in IDLE. */
set_color(LED_GREEN);
break;
default:
/* Other states don't alter LED behavior */
break;
}
}
static void led_init(void)
{
/*
* Enable PWMs and set to 0% duty cycle. If they're disabled,
* seems to ground the pins instead of letting them float.
*/
pwm_enable(PWM_CH_LED_RED, 1);
pwm_enable(PWM_CH_LED_GREEN, 1);
pwm_enable(PWM_CH_LED_BLUE, 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)
{
if (led_debug)
return;
if (extpower_is_present()) {
if (led_auto_control_is_enabled(EC_LED_ID_BATTERY_LED)) {
strago_led_set_battery();
return;
}
} else if (led_auto_control_is_enabled(EC_LED_ID_POWER_LED)) {
strago_led_set_power();
return;
}
set_color(LED_OFF);
}
DECLARE_HOOK(HOOK_TICK, led_tick, HOOK_PRIO_DEFAULT);
static void dump_pwm_channels(void)
{
int ch;
for (ch = 0; ch < 4; ch++) {
CPRINTF("channel = %d\n", ch);
CPRINTF("0x%04X 0x%04X 0x%04X\n",
MEC1322_PWM_CFG(ch),
MEC1322_PWM_ON(ch),
MEC1322_PWM_OFF(ch));
}
}
/******************************************************************/
/* Console commands */
static int command_led_color(int argc, char **argv)
{
if (argc > 1) {
if (!strcasecmp(argv[1], "debug")) {
led_debug ^= 1;
CPRINTF("led_debug = %d\n", led_debug);
} else if (!strcasecmp(argv[1], "off")) {
set_color(LED_OFF);
} else if (!strcasecmp(argv[1], "red")) {
set_color(LED_RED);
} else if (!strcasecmp(argv[1], "green")) {
set_color(LED_GREEN);
} else if (!strcasecmp(argv[1], "amber")) {
set_color(LED_AMBER);
} else {
/* maybe handle charger_discharge_on_ac() too? */
return EC_ERROR_PARAM1;
}
}
if (led_debug == 1)
dump_pwm_channels();
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(ledcolor, command_led_color,
"[debug|red|green|amber|off]",
"Change LED color");
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