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/* Copyright 2018 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 Kalista
*/
#include "chipset.h"
#include "console.h"
#include "ec_commands.h"
#include "gpio.h"
#include "hooks.h"
#include "led_common.h"
#include "pwm.h"
#include "timer.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_BLUE,
LED_AMBER,
/* Number of colors, not a color itself */
LED_COLOR_COUNT
};
static int set_color_power(enum led_color color, int duty)
{
int blue = 0;
int red = 0;
if (duty < 0 || 100 < duty)
return EC_ERROR_UNKNOWN;
switch (color) {
case LED_OFF:
break;
case LED_BLUE:
blue = 1;
break;
case LED_RED:
red = 1;
break;
case LED_AMBER:
blue = 1;
red = 1;
break;
default:
return EC_ERROR_UNKNOWN;
}
if (red)
pwm_set_duty(PWM_CH_LED_RED, duty);
else
pwm_set_duty(PWM_CH_LED_RED, 0);
if (blue)
pwm_set_duty(PWM_CH_LED_BLUE, duty);
else
pwm_set_duty(PWM_CH_LED_BLUE, 0);
return EC_SUCCESS;
}
static int set_color(enum ec_led_id id, enum led_color color, int duty)
{
switch (id) {
case EC_LED_ID_POWER_LED:
return set_color_power(color, duty);
default:
return EC_ERROR_UNKNOWN;
}
}
#define LED_PULSE_US (2 * SECOND)
/* 40 msec for nice and smooth transition. */
#define LED_PULSE_TICK_US (40 * MSEC)
/* When pulsing is enabled, brightness is incremented by <duty_inc> every
* <interval> usec from 0 to 100% in LED_PULSE_US usec. Then it's decremented
* likewise in LED_PULSE_US usec. */
static struct {
uint32_t interval;
int duty_inc;
enum led_color color;
int duty;
} led_pulse;
#define LED_PULSE_TICK(interval, color) \
config_tick((interval), 100 / (LED_PULSE_US / (interval)), (color))
static void config_tick(uint32_t interval, int duty_inc, enum led_color color)
{
led_pulse.interval = interval;
led_pulse.duty_inc = duty_inc;
led_pulse.color = color;
led_pulse.duty = 0;
}
static void pulse_power_led(enum led_color color)
{
set_color(EC_LED_ID_POWER_LED, color, led_pulse.duty);
if (led_pulse.duty + led_pulse.duty_inc > 100)
led_pulse.duty_inc = led_pulse.duty_inc * -1;
else if (led_pulse.duty + led_pulse.duty_inc < 0)
led_pulse.duty_inc = led_pulse.duty_inc * -1;
led_pulse.duty += led_pulse.duty_inc;
}
static void led_tick(void);
DECLARE_DEFERRED(led_tick);
static void led_tick(void)
{
uint32_t elapsed;
uint32_t next = 0;
uint32_t start = get_time().le.lo;
static uint8_t pwm_enabled = 0;
if (!pwm_enabled) {
pwm_enable(PWM_CH_LED_RED, 1);
pwm_enable(PWM_CH_LED_BLUE, 1);
pwm_enabled = 1;
}
if (led_auto_control_is_enabled(EC_LED_ID_POWER_LED))
pulse_power_led(led_pulse.color);
elapsed = get_time().le.lo - start;
next = led_pulse.interval > elapsed ? led_pulse.interval - elapsed : 0;
hook_call_deferred(&led_tick_data, next);
}
static void led_suspend(void)
{
LED_PULSE_TICK(LED_PULSE_TICK_US, LED_BLUE);
led_tick();
}
DECLARE_HOOK(HOOK_CHIPSET_SUSPEND, led_suspend, HOOK_PRIO_DEFAULT);
static void led_shutdown(void)
{
hook_call_deferred(&led_tick_data, -1);
if (led_auto_control_is_enabled(EC_LED_ID_POWER_LED))
set_color(EC_LED_ID_POWER_LED, LED_OFF, 0);
}
DECLARE_HOOK(HOOK_CHIPSET_SHUTDOWN, led_shutdown, HOOK_PRIO_DEFAULT);
static void led_resume(void)
{
/* Assume there is no race condition with led_tick, which also
* runs in hook_task. */
hook_call_deferred(&led_tick_data, -1);
if (led_auto_control_is_enabled(EC_LED_ID_POWER_LED))
set_color(EC_LED_ID_POWER_LED, LED_BLUE, 100);
}
DECLARE_HOOK(HOOK_CHIPSET_RESUME, led_resume, HOOK_PRIO_DEFAULT);
void led_alert(int enable)
{
if (enable) {
/* Overwrite the current signal */
config_tick(1 * SECOND, 100, LED_RED);
led_tick();
} else {
/* Restore the previous signal */
if (chipset_in_state(CHIPSET_STATE_ON))
led_resume();
else if (chipset_in_state(CHIPSET_STATE_SUSPEND))
led_suspend();
else if (chipset_in_state(CHIPSET_STATE_ANY_OFF))
led_shutdown();
}
}
void led_critical(void)
{
hook_call_deferred(&led_tick_data, -1);
if (led_auto_control_is_enabled(EC_LED_ID_POWER_LED))
set_color(EC_LED_ID_POWER_LED, LED_RED, 100);
}
static int command_led(int argc, char **argv)
{
enum ec_led_id id = EC_LED_ID_POWER_LED;
if (argc < 2)
return EC_ERROR_PARAM_COUNT;
if (!strcasecmp(argv[1], "debug")) {
led_auto_control(id, !led_auto_control_is_enabled(id));
ccprintf("o%s\n", led_auto_control_is_enabled(id) ? "ff" : "n");
} else if (!strcasecmp(argv[1], "off")) {
set_color(id, LED_OFF, 0);
} else if (!strcasecmp(argv[1], "red")) {
set_color(id, LED_RED, 100);
} else if (!strcasecmp(argv[1], "blue")) {
set_color(id, LED_BLUE, 100);
} else if (!strcasecmp(argv[1], "amber")) {
set_color(id, LED_AMBER, 100);
} else if (!strcasecmp(argv[1], "alert")) {
led_alert(1);
} else if (!strcasecmp(argv[1], "crit")) {
led_critical();
} else {
return EC_ERROR_PARAM1;
}
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(led, command_led,
"[debug|red|blue|amber|off|alert|crit]",
"Turn on/off LED.");
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_AMBER] = 100;
}
int led_set_brightness(enum ec_led_id id, const uint8_t *brightness)
{
if (brightness[EC_LED_COLOR_RED])
return set_color(id, LED_RED, brightness[EC_LED_COLOR_RED]);
else if (brightness[EC_LED_COLOR_BLUE])
return set_color(id, LED_BLUE, brightness[EC_LED_COLOR_BLUE]);
else if (brightness[EC_LED_COLOR_AMBER])
return set_color(id, LED_AMBER, brightness[EC_LED_COLOR_AMBER]);
else
return set_color(id, LED_OFF, 0);
}
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