path: root/drivers/thermal/thermal_sysfs.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  thermal.c - sysfs interface of thermal devices
 *
 *  Copyright (C) 2016 Eduardo Valentin <edubezval@gmail.com>
 *
 *  Highly based on original thermal_core.c
 *  Copyright (C) 2008 Intel Corp
 *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
 *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/sysfs.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/jiffies.h>

#include "thermal_core.h"

/* sys I/F for thermal zone */

static ssize_t
type_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);

	return sprintf(buf, "%s\n", tz->type);
}

static ssize_t
temp_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	int temperature, ret;

	ret = thermal_zone_get_temp(tz, &temperature);

	if (ret)
		return ret;

	return sprintf(buf, "%d\n", temperature);
}

static ssize_t
mode_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	int enabled;

	mutex_lock(&tz->lock);
	enabled = thermal_zone_device_is_enabled(tz);
	mutex_unlock(&tz->lock);

	return sprintf(buf, "%s\n", enabled ? "enabled" : "disabled");
}

static ssize_t
mode_store(struct device *dev, struct device_attribute *attr,
	   const char *buf, size_t count)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	int result;

	if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
		result = thermal_zone_device_enable(tz);
	else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
		result = thermal_zone_device_disable(tz);
	else
		result = -EINVAL;

	if (result)
		return result;

	return count;
}

static ssize_t
trip_point_type_show(struct device *dev, struct device_attribute *attr,
		     char *buf)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	int trip_id;

	if (sscanf(attr->attr.name, "trip_point_%d_type", &trip_id) != 1)
		return -EINVAL;

	switch (tz->trips[trip_id].type) {
	case THERMAL_TRIP_CRITICAL:
		return sprintf(buf, "critical\n");
	case THERMAL_TRIP_HOT:
		return sprintf(buf, "hot\n");
	case THERMAL_TRIP_PASSIVE:
		return sprintf(buf, "passive\n");
	case THERMAL_TRIP_ACTIVE:
		return sprintf(buf, "active\n");
	default:
		return sprintf(buf, "unknown\n");
	}
}

static ssize_t
trip_point_temp_store(struct device *dev, struct device_attribute *attr,
		      const char *buf, size_t count)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	struct thermal_trip *trip;
	int trip_id, ret;
	int temp;

	ret = kstrtoint(buf, 10, &temp);
	if (ret)
		return -EINVAL;

	if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip_id) != 1)
		return -EINVAL;

	mutex_lock(&tz->lock);

	trip = &tz->trips[trip_id];

	if (temp != trip->temperature) {
		if (tz->ops.set_trip_temp) {
			ret = tz->ops.set_trip_temp(tz, trip_id, temp);
			if (ret)
				goto unlock;
		}

		thermal_zone_set_trip_temp(tz, trip, temp);

		__thermal_zone_device_update(tz, THERMAL_TRIP_CHANGED);
	}

unlock:
	mutex_unlock(&tz->lock);

	return ret ? ret : count;
}

static ssize_t
trip_point_temp_show(struct device *dev, struct device_attribute *attr,
		     char *buf)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	int trip_id;

	if (sscanf(attr->attr.name, "trip_point_%d_temp", &trip_id) != 1)
		return -EINVAL;

	return sprintf(buf, "%d\n", tz->trips[trip_id].temperature);
}

static ssize_t
trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
		      const char *buf, size_t count)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	struct thermal_trip *trip;
	int trip_id, ret;
	int hyst;

	ret = kstrtoint(buf, 10, &hyst);
	if (ret || hyst < 0)
		return -EINVAL;

	if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip_id) != 1)
		return -EINVAL;

	mutex_lock(&tz->lock);

	trip = &tz->trips[trip_id];

	if (hyst != trip->hysteresis) {
		trip->hysteresis = hyst;

		thermal_zone_trip_updated(tz, trip);
	}

	mutex_unlock(&tz->lock);

	return count;
}

static ssize_t
trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
		     char *buf)
{
	struct thermal_zone_device *tz = to_thermal_zone(dev);
	int trip_id;

	if (sscanf(attr->attr.name, "trip_point_%d_hyst", &trip_id) != 1)
		return -EINVAL;

	return sprintf(