linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 *  of-thermal.c - Generic Thermal Management device tree support.

 *

 *  Copyright (C) 2013 Texas Instruments

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

 */

#include <linux/thermal.h>

#include <linux/slab.h>

#include <linux/types.h>

#include <linux/of_device.h>

#include <linux/of_platform.h>

#include <linux/err.h>

#include <linux/export.h>

#include <linux/string.h>

​

#include "thermal_core.h"

​

/***   Private data structures to represent thermal device tree data ***/

​

/**

 * struct __thermal_cooling_bind_param - a cooling device for a trip point

 * @cooling_device: a pointer to identify the referred cooling device

 * @min: minimum cooling state used at this trip point

 * @max: maximum cooling state used at this trip point

 */

​

struct __thermal_cooling_bind_param {

    struct device_node *cooling_device;

    unsigned long min;

    unsigned long max;

};

​

/**

 * struct __thermal_bind_param - a match between trip and cooling device

 * @tcbp: a pointer to an array of cooling devices

 * @count: number of elements in array

 * @trip_id: the trip point index

 * @usage: the percentage (from 0 to 100) of cooling contribution

 */

​

struct __thermal_bind_params {

    struct __thermal_cooling_bind_param *tcbp;

    unsigned int count;

    unsigned int trip_id;

    unsigned int usage;

};

​

/**

 * struct __thermal_zone - internal representation of a thermal zone

 * @mode: current thermal zone device mode (enabled/disabled)

 * @passive_delay: polling interval while passive cooling is activated

 * @polling_delay: zone polling interval

 * @slope: slope of the temperature adjustment curve

 * @offset: offset of the temperature adjustment curve

 * @ntrips: number of trip points

 * @trips: an array of trip points (0..ntrips - 1)

 * @num_tbps: number of thermal bind params

 * @tbps: an array of thermal bind params (0..num_tbps - 1)

 * @sensor_data: sensor private data used while reading temperature and trend

 * @ops: set of callbacks to handle the thermal zone based on DT

 */

​

struct __thermal_zone {

    enum thermal_device_mode mode;

    int passive_delay;

    int polling_delay;

    int slope;

    int offset;

​

    /* trip data */

    int ntrips;

    struct thermal_trip *trips;

​

    /* cooling binding data */

    int num_tbps;

    struct __thermal_bind_params *tbps;

​

    /* sensor interface */

    void *sensor_data;

    const struct thermal_zone_of_device_ops *ops;

};

​

/***   DT thermal zone device callbacks   ***/

​

static int of_thermal_get_temp(struct thermal_zone_device *tz,

                   int *temp)

{

    struct __thermal_zone *data = tz->devdata;

​

    if (!data->ops->get_temp)

        return -EINVAL;