drivers/power/power_supply_leds.c

/*
 *  LEDs triggers for power supply class
 *
 *  Copyright © 2007  Anton Vorontsov <cbou@mail.ru>
 *  Copyright © 2004  Szabolcs Gyurko
 *  Copyright © 2003  Ian Molton <spyro@f2s.com>
 *
 *  Modified: 2004, Oct     Szabolcs Gyurko
 *
 *  You may use this code as per GPL version 2
 */

#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/power_supply.h>
#include <linux/slab.h>

#include "power_supply.h"

#define BATTERY_LOW	15
#define BATTERY_HIGH	90

static bool off_charge_flag;

/* Battery specific LEDs triggers. */

static void power_supply_update_bat_leds(struct power_supply *psy)
{
	union power_supply_propval status;
	union power_supply_propval capacity;
	union power_supply_propval profile_status;

	/* only control the leds in off charge mode */
	if (!off_charge_flag)
		return;

	/* set the leds color after battery proflie loaded */
	if (psy->get_property(psy, POWER_SUPPLY_PROP_PROFILE_STATUS,
		&profile_status))
		return;

	if (profile_status.intval == 0)
		return;

	if (psy->get_property(psy, POWER_SUPPLY_PROP_STATUS, &status))
		return;

	/* turn off the leds while not charging */
	if (status.intval != POWER_SUPPLY_STATUS_FULL
		&& status.intval != POWER_SUPPLY_STATUS_CHARGING){
		led_trigger_event(psy->charging_full_trig, LED_OFF);
		led_trigger_event(psy->charging_trig, LED_OFF);
		led_trigger_event(psy->full_trig, LED_OFF);
		led_trigger_event(psy->charging_blink_full_solid_trig, LED_OFF);
		return;
	}

	if (psy->get_property(psy, POWER_SUPPLY_PROP_CAPACITY, &capacity))
		return;

	if (capacity.intval < 0) {
		return;
	} else if (capacity.intval < BATTERY_LOW) {
		/* set led red */
		led_trigger_event(psy->charging_full_trig, LED_OFF);
		led_trigger_event(psy->charging_trig, LED_FULL);
		led_trigger_event(psy->full_trig, LED_OFF);
		led_trigger_event(psy->charging_blink_full_solid_trig, LED_OFF);
	} else if (capacity.intval < BATTERY_HIGH) {
		/* set led yellow */
		led_trigger_event(psy->charging_full_trig, LED_OFF);
		led_trigger_event(psy->charging_trig, LED_FULL);
		led_trigger_event(psy->full_trig, LED_FULL);
		led_trigger_event(psy->charging_blink_full_solid_trig, LED_OFF);
	} else {
		/* set led green */
		led_trigger_event(psy->charging_full_trig, LED_OFF);
		led_trigger_event(psy->charging_trig, LED_OFF);
		led_trigger_event(psy->full_trig, LED_FULL);
		led_trigger_event(psy->charging_blink_full_solid_trig, LED_OFF);
	}
}

static int __init early_parse_off_charge_flag(char *p)
{
	if (p) {
		if (!strcmp(p, "charger"))
			off_charge_flag = true;
	}
	return 0;
}
early_param("androidboot.mode", early_parse_off_charge_flag);

static int power_supply_create_bat_triggers(struct power_supply *psy)
{
	int rc = 0;

	psy->charging_full_trig_name = kasprintf(GFP_KERNEL,
					"%s-charging-or-full", psy->name);
	if (!psy->charging_full_trig_name)
		goto charging_full_failed;

	psy->charging_trig_name = kasprintf(GFP_KERNEL,
					"%s-charging", psy->name);
	if (!psy->charging_trig_name)
		goto charging_failed;

	psy->full_trig_name = kasprintf(GFP_KERNEL, "%s-full", psy->name);
	if (!psy->full_trig_name)
		goto full_failed;

	psy->charging_blink_full_solid_trig_name = kasprintf(GFP_KERNEL,
		"%s-charging-blink-full-solid", psy->name);
	if (!psy->charging_blink_full_solid_trig_name)
		goto charging_blink_full_solid_failed;

	led_trigger_register_simple(psy->charging_full_trig_name,
				    &psy->charging_full_trig);
	led_trigger_register_simple(psy->charging_trig_name,
				    &psy->charging_trig);
	led_trigger_register_simple(psy->full_trig_name,
				    &psy->full_trig);
	led_trigger_register_simple(psy->charging_blink_full_solid_trig_name,
				    &psy->charging_blink_full_solid_trig);

	goto success;

charging_blink_full_solid_failed:
	kfree(psy->full_trig_name);
full_failed:
	kfree(psy->charging_trig_name);
charging_failed:
	kfree(psy->charging_full_trig_name);
charging_full_failed:
	rc = -ENOMEM;
success:
	return rc;
}

static void power_supply_remove_bat_triggers(struct power_supply *psy)
{
	led_trigger_unregister_simple(psy->charging_full_trig);
	led_trigger_unregister_simple(psy->charging_trig);
	led_trigger_unregister_simple(psy->full_trig);
	led_trigger_unregister_simple(psy->charging_blink_full_solid_trig);
	kfree(psy->charging_blink_full_solid_trig_name);
	kfree(psy->full_trig_name);
	kfree(psy->charging_trig_name);
	kfree(psy->charging_full_trig_name);
}

/* Generated power specific LEDs triggers. */

static void power_supply_update_gen_leds(struct power_supply *psy)
{
	union power_supply_propval online;

	if (psy->get_property(psy, POWER_SUPPLY_PROP_ONLINE, &online))
		return;

	dev_dbg(psy->dev, "%s %d\n", __func__, online.intval);

	if (online.intval)
		led_trigger_event(psy->online_trig, LED_FULL);
	else
		led_trigger_event(psy->online_trig, LED_OFF);
}

static int power_supply_create_gen_triggers(struct power_supply *psy)
{
	int rc = 0;

	psy->online_trig_name = kasprintf(GFP_KERNEL, "%s-online", psy->name);
	if (!psy->online_trig_name)
		goto online_failed;

	led_trigger_register_simple(psy->online_trig_name, &psy->online_trig);

	goto success;

online_failed:
	rc = -ENOMEM;
success:
	return rc;
}

static void power_supply_remove_gen_triggers(struct power_supply *psy)
{
	led_trigger_unregister_simple(psy->online_trig);
	kfree(psy->online_trig_name);
}

/* Choice what triggers to create&update. */

void power_supply_update_leds(struct power_supply *psy)
{
	if (psy->type == POWER_SUPPLY_TYPE_BATTERY)
		power_supply_update_bat_leds(psy);
	else
		power_supply_update_gen_leds(psy);
}

int power_supply_create_triggers(struct power_supply *psy)
{
	if (psy->type == POWER_SUPPLY_TYPE_BATTERY)
		return power_supply_create_bat_triggers(psy);
	return power_supply_create_gen_triggers(psy);
}

void power_supply_remove_triggers(struct power_supply *psy)
{
	if (psy->type == POWER_SUPPLY_TYPE_BATTERY)
		power_supply_remove_bat_triggers(psy);
	else
		power_supply_remove_gen_triggers(psy);
}