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// SPDX-License-Identifier: GPL-2.0-only
/*
* 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
*/
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/power_supply.h>
#include <linux/slab.h>
#include <linux/leds.h>
#include "power_supply.h"
/* Battery specific LEDs triggers. */
struct power_supply_led_trigger {
struct led_trigger trig;
struct power_supply *psy;
};
#define trigger_to_psy_trigger(trigger) \
container_of(trigger, struct power_supply_led_trigger, trig)
static int power_supply_led_trigger_activate(struct led_classdev *led_cdev)
{
struct power_supply_led_trigger *psy_trig =
trigger_to_psy_trigger(led_cdev->trigger);
/* Sync current power-supply state to LED being activated */
power_supply_update_leds(psy_trig->psy);
return 0;
}
static int power_supply_register_led_trigger(struct power_supply *psy,
const char *name_template,
struct led_trigger **tp, int *err)
{
struct power_supply_led_trigger *psy_trig;
int ret = -ENOMEM;
/* Bail on previous errors */
if (err && *err)
return *err;
psy_trig = kzalloc(sizeof(*psy_trig), GFP_KERNEL);
if (!psy_trig)
goto err_free_trigger;
psy_trig->trig.name = kasprintf(GFP_KERNEL, name_template, psy->desc->name);
if (!psy_trig->trig.name)
goto err_free_trigger;
psy_trig->trig.activate = power_supply_led_trigger_activate;
psy_trig->psy = psy;
ret = led_trigger_register(&psy_trig->trig);
if (ret)
goto err_free_name;
*tp = &psy_trig->trig;
return 0;
err_free_name:
kfree(psy_trig->trig.name);
err_free_trigger:
kfree(psy_trig);
if (err)
*err = ret;
return ret;
}
static void power_supply_unregister_led_trigger(struct led_trigger *trig)
{
struct power_supply_led_trigger *psy_trig;
if (!trig)
return;
psy_trig = trigger_to_psy_trigger(trig);
led_trigger_unregister(&psy_trig->trig);
kfree(psy_trig->trig.name);
kfree(psy_trig);
}
static void power_supply_update_bat_leds(struct power_supply *psy)
{
union power_supply_propval status;
unsigned int intensity_green[3] = { 0, 255, 0 };
unsigned int intensity_orange[3] = { 255, 128, 0 };
if (power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS, &status))
return;
dev_dbg(&psy->dev, "%s %d\n", __func__, status.intval);
switch (status.intval) {
case POWER_SUPPLY_STATUS_FULL:
led_trigger_event(psy->trig, LED_FULL);
led_trigger_event(psy->charging_trig, LED_OFF);
led_trigger_event(psy->full_trig, LED_FULL);
/* Going from blink to LED on requires a LED_OFF event to stop blink */
led_trigger_event(psy->charging_blink_full_solid_trig, LED_OFF);
led_trigger_event(psy->charging_blink_full_solid_trig, LED_FULL);
led_mc_trigger_event(psy->charging_orange_full_green_trig,
intensity_green,
ARRAY_SIZE(intensity_green),
LED_FULL);
break;
case POWER_SUPPLY_STATUS_CHARGING:
led_trigger_event(psy->trig, LED_FULL);
led_trigger_event(psy->charging_trig, LED_FULL);
led_trigger_event(psy->full_trig, LED_OFF);
led_trigger_blink(psy->charging_blink_full_solid_trig, 0, 0);
led_mc_trigger_event(psy->charging_orange_full_green_trig,
intensity_orange,
ARRAY_SIZE(intensity_orange),
LED_FULL);
break;
default:
led_trigger_event(psy->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);
led_trigger_event(psy->charging_orange_full_green_trig,
LED_OFF);
break;
}
}
static void power_supply_remove_bat_triggers(struct power_supply *psy)
{
power_supply_unregister_led_trigger(psy->trig);
power_supply_unregister_led_trigger(psy->charging_trig);
power_supply_unregister_led_trigger(psy->full_trig);
power_supply_unregister_led_trigger(psy->charging_blink_full_solid_trig);
power_supply_unregister_led_trigger(psy->charging_orange_full_green_trig);
}
static int power_supply_create_bat_triggers(struct power_supply *psy)
{
int err = 0;
power_supply_register_led_trigger(psy, "%s-charging-or-full",
&psy->trig, &err);
power_supply_register_led_trigger(psy, "%s-charging",
&psy->charging_trig, &err);
power_supply_register_led_trigger(psy, "%s-full",
&psy->full_trig, &err);
power_supply_register_led_trigger(psy, "%s-charging-blink-full-solid",
&psy->charging_blink_full_solid_trig, &err);
power_supply_register_led_trigger(psy, "%s-charging-orange-full-green",
&psy->charging_orange_full_green_trig, &err);
if (err)
power_supply_remove_bat_triggers(psy);
return err;
}
/* Generated power specific LEDs triggers. */
static void power_supply_update_gen_leds(struct power_supply *psy)
{
union power_supply_propval online;
if (power_supply_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->trig, LED_FULL);
else
led_trigger_event(psy->trig, LED_OFF);
}
static int power_supply_create_gen_triggers(struct power_supply *psy)
{
return power_supply_register_led_trigger(psy, "%s-online", &psy->trig, NULL);
}
static void power_supply_remove_gen_triggers(struct power_supply *psy)
{
power_supply_unregister_led_trigger(psy->trig);
}
/* Choice what triggers to create&update. */
void power_supply_update_leds(struct power_supply *psy)
{
if (psy->desc->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->desc->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->desc->type == POWER_SUPPLY_TYPE_BATTERY)
power_supply_remove_bat_triggers(psy);
else
power_supply_remove_gen_triggers(psy);
}
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