linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 *  thermal_hwmon.c - Generic Thermal Management hwmon support.

 *

 *  Code based on Intel thermal_core.c. Copyrights of the original code:

 *  Copyright (C) 2008 Intel Corp

 *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>

 *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>

 *

 *  Copyright (C) 2013 Texas Instruments

 *  Copyright (C) 2013 Eduardo Valentin <eduardo.valentin@ti.com>

 */

#include <linux/hwmon.h>

#include <linux/thermal.h>

#include <linux/slab.h>

#include <linux/err.h>

#include "thermal_hwmon.h"

​

/* hwmon sys I/F */

/* thermal zone devices with the same type share one hwmon device */

struct thermal_hwmon_device {

    char type[THERMAL_NAME_LENGTH];

    struct device *device;

    int count;

    struct list_head tz_list;

    struct list_head node;

};

​

struct thermal_hwmon_attr {

    struct device_attribute attr;

    char name[16];

};

​

/* one temperature input for each thermal zone */

struct thermal_hwmon_temp {

    struct list_head hwmon_node;

    struct thermal_zone_device *tz;

    struct thermal_hwmon_attr temp_input;   /* hwmon sys attr */

    struct thermal_hwmon_attr temp_crit;    /* hwmon sys attr */

};

​

static LIST_HEAD(thermal_hwmon_list);

​

static DEFINE_MUTEX(thermal_hwmon_list_lock);

​

static ssize_t

temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)

{

    int temperature;

    int ret;

    struct thermal_hwmon_attr *hwmon_attr

            = container_of(attr, struct thermal_hwmon_attr, attr);

    struct thermal_hwmon_temp *temp

            = container_of(hwmon_attr, struct thermal_hwmon_temp,

                       temp_input);

    struct thermal_zone_device *tz = temp->tz;

​

    ret = thermal_zone_get_temp(tz, &temperature);

​

    if (ret)

        return ret;

​

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