power_supply_leds.c

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/*
 *  LEDs triggers for power supply class
 *
 *  Copyright © 2007  Anton Vorontsov <[email protected]>
 *  Copyright © 2004  Szabolcs Gyurko
 *  Copyright © 2003  Ian Molton <[email protected]>
 *
 *  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"

/* Battery specific LEDs triggers. */

static void power_supply_update_bat_leds(struct power_supply *psy)
{
    union power_supply_propval status;
    unsigned long delay_on = 0;
    unsigned long delay_off = 0;

    if (psy->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->charging_full_trig, LED_FULL);
        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_FULL);
        break;
    case POWER_SUPPLY_STATUS_CHARGING:
        led_trigger_event(psy->charging_full_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,
            &delay_on, &delay_off);
        break;
    default:
        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);
        break;
    }
}

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);
}