// SPDX-License-Identifier: GPL-2.0-only
/*
 *  user_space.c - A simple user space Thermal events notifier
 *
 *  Copyright (C) 2012 Intel Corp
 *  Copyright (C) 2012 Durgadoss R <durgadoss.r@intel.com>
 *
 *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */

#include <linux/slab.h>
#include <linux/thermal.h>

#include "thermal_core.h"

static int user_space_bind(struct thermal_zone_device *tz)
{
        pr_info_once("Consider using thermal netlink events interface\n");

        return 0;
}

/**
 * user_space_trip_crossed - Notify user space about trip crossing events
 * @tz: thermal_zone_device
 * @trip: trip point
 * @upward: whether or not the trip has been crossed on the way up
 *
 * This function notifies the user space through UEvents.
 */
static void user_space_trip_crossed(struct thermal_zone_device *tz,
                                    const struct thermal_trip *trip,
                                    bool upward)
{
        char *thermal_prop[5];
        int i;

        lockdep_assert_held(&tz->lock);

        thermal_prop[0] = kasprintf(GFP_KERNEL, "NAME=%s", tz->type);
        thermal_prop[1] = kasprintf(GFP_KERNEL, "TEMP=%d", tz->temperature);
        thermal_prop[2] = kasprintf(GFP_KERNEL, "TRIP=%d",
                                    thermal_zone_trip_id(tz, trip));
        thermal_prop[3] = kasprintf(GFP_KERNEL, "EVENT=%d", tz->notify_event);
        thermal_prop[4] = NULL;
        kobject_uevent_env(&tz->device.kobj, KOBJ_CHANGE, thermal_prop);
        for (i = 0; i < 4; ++i)
                kfree(thermal_prop[i]);
}

static struct thermal_governor thermal_gov_user_space = {
        .name           = "user_space",
        .trip_crossed   = user_space_trip_crossed,
        .bind_to_tz     = user_space_bind,
};
THERMAL_GOVERNOR_DECLARE(thermal_gov_user_space);