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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 and battery LED control for Gandof.
*/
#include "battery.h"
#include "charge_state.h"
#include "chipset.h"
#include "ec_commands.h"
#include "gpio.h"
#include "hooks.h"
#include "host_command.h"
#include "led_common.h"
#include "util.h"
#define CRITICAL_LOW_BATTERY_PERMILLAGE 71
#define LOW_BATTERY_PERMILLAGE 137
#define FULL_BATTERY_PERMILLAGE 937
#define LED_TOTAL_4SECS_TICKS 16
#define LED_TOTAL_2SECS_TICKS 8
#define LED_ON_1SEC_TICKS 4
#define LED_ON_2SECS_TICKS 8
enum led_color {
LED_OFF = 0,
LED_BLUE,
LED_AMBER,
LED_PINK,
LED_COLOR_COUNT /* Number of colors, not a color itself */
};
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);
static int gandof_led_set_gpio(enum led_color color,
enum gpio_signal gpio_led_blue_l,
enum gpio_signal gpio_led_amber_l)
{
switch (color) {
case LED_OFF:
gpio_set_level(gpio_led_blue_l, 1);
gpio_set_level(gpio_led_amber_l, 1);
break;
case LED_BLUE:
gpio_set_level(gpio_led_blue_l, 0);
gpio_set_level(gpio_led_amber_l, 1);
break;
case LED_AMBER:
gpio_set_level(gpio_led_blue_l, 1);
gpio_set_level(gpio_led_amber_l, 0);
break;
case LED_PINK:
gpio_set_level(gpio_led_blue_l, 0);
gpio_set_level(gpio_led_amber_l, 0);
break;
default:
return EC_ERROR_UNKNOWN;
}
return EC_SUCCESS;
}
static int gandof_led_set_color_battery(enum led_color color)
{
return gandof_led_set_gpio(color, GPIO_BAT_LED0_L, GPIO_BAT_LED1_L);
}
static int gandof_led_set_color_power(enum led_color color)
{
return gandof_led_set_gpio(color, GPIO_PWR_LED0_L, GPIO_PWR_LED1_L);
}
static int gandof_led_set_color(enum ec_led_id led_id, enum led_color color)
{
int rv;
led_auto_control(led_id, 0);
switch (led_id) {
case EC_LED_ID_BATTERY_LED:
rv = gandof_led_set_color_battery(color);
break;
case EC_LED_ID_POWER_LED:
rv = gandof_led_set_color_power(color);
break;
default:
return EC_ERROR_UNKNOWN;
}
return rv;
}
int led_set_brightness(enum ec_led_id led_id, const uint8_t *brightness)
{
if (brightness[EC_LED_COLOR_BLUE] != 0 &&
brightness[EC_LED_COLOR_YELLOW] != 0)
gandof_led_set_color(led_id, LED_PINK);
else if (brightness[EC_LED_COLOR_BLUE] != 0)
gandof_led_set_color(led_id, LED_BLUE);
else if (brightness[EC_LED_COLOR_YELLOW] != 0)
gandof_led_set_color(led_id, LED_AMBER);
else
gandof_led_set_color(led_id, LED_OFF);
return EC_SUCCESS;
}
void led_get_brightness_range(enum ec_led_id led_id, uint8_t *brightness_range)
{
/* Ignoring led_id as both leds support the same colors */
brightness_range[EC_LED_COLOR_BLUE] = 1;
brightness_range[EC_LED_COLOR_YELLOW] = 1;
}
static void gandof_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. */
gandof_led_set_color_power(
(power_ticks % LED_TOTAL_4SECS_TICKS <
LED_ON_1SEC_TICKS) ? LED_AMBER : LED_OFF);
previous_state_suspend = 1;
return;
}
previous_state_suspend = 0;
if (chipset_in_state(CHIPSET_STATE_ANY_OFF))
gandof_led_set_color_power(LED_OFF);
else if (chipset_in_state(CHIPSET_STATE_ON))
gandof_led_set_color_power(LED_BLUE);
}
static void gandof_led_set_battery(void)
{
static int battery_ticks;
uint32_t chflags = charge_get_flags();
int remaining_capacity;
int full_charge_capacity;
int permillage;
battery_ticks++;
remaining_capacity = *(int *)host_get_memmap(EC_MEMMAP_BATT_CAP);
full_charge_capacity = *(int *)host_get_memmap(EC_MEMMAP_BATT_LFCC);
permillage = !full_charge_capacity ? 0 :
(1000 * remaining_capacity) / full_charge_capacity;
switch (charge_get_state()) {
case PWR_STATE_CHARGE:
/* Make the percentage approximate to UI shown */
gandof_led_set_color_battery(permillage <
FULL_BATTERY_PERMILLAGE ? LED_AMBER : LED_BLUE);
break;
case PWR_STATE_CHARGE_NEAR_FULL:
gandof_led_set_color_battery(LED_BLUE);
break;
case PWR_STATE_DISCHARGE:
/* Less than 3%, blink one second every two seconds */
if (!chipset_in_state(CHIPSET_STATE_ANY_OFF) &&
permillage <= CRITICAL_LOW_BATTERY_PERMILLAGE)
gandof_led_set_color_battery(
(battery_ticks % LED_TOTAL_2SECS_TICKS <
LED_ON_1SEC_TICKS) ? LED_AMBER : LED_OFF);
/* Less than 10%, blink one second every four seconds */
else if (!chipset_in_state(CHIPSET_STATE_ANY_OFF) &&
permillage <= LOW_BATTERY_PERMILLAGE)
gandof_led_set_color_battery(
(battery_ticks % LED_TOTAL_4SECS_TICKS <
LED_ON_1SEC_TICKS) ? LED_AMBER : LED_OFF);
else
gandof_led_set_color_battery(LED_OFF);
break;
case PWR_STATE_ERROR:
gandof_led_set_color_battery(
(battery_ticks % LED_TOTAL_2SECS_TICKS <
LED_ON_1SEC_TICKS) ? LED_AMBER : LED_OFF);
break;
case PWR_STATE_IDLE: /* External power connected in IDLE. */
if (chflags & CHARGE_FLAG_FORCE_IDLE)
gandof_led_set_color_battery(
(battery_ticks % LED_TOTAL_4SECS_TICKS <
LED_ON_2SECS_TICKS) ? LED_BLUE : LED_AMBER);
else
gandof_led_set_color_battery(LED_BLUE);
break;
default:
/* Other states don't alter LED behavior */
break;
}
}
/* Called by hook task every 250mSec */
static void led_tick(void)
{
if (led_auto_control_is_enabled(EC_LED_ID_POWER_LED))
gandof_led_set_power();
if (led_auto_control_is_enabled(EC_LED_ID_BATTERY_LED))
gandof_led_set_battery();
}
DECLARE_HOOK(HOOK_TICK, led_tick, HOOK_PRIO_DEFAULT);
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