linux-imx

/*

 * SPEAr thermal driver.

 *

 * Copyright (C) 2011-2012 ST Microelectronics

 * Author: Vincenzo Frascino <vincenzo.frascino@st.com>

 *

 * This software is licensed under the terms of the GNU General Public

 * License version 2, as published by the Free Software Foundation, and

 * may be copied, distributed, and modified under those terms.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

 * GNU General Public License for more details.

 *

 */

​

#include <linux/clk.h>

#include <linux/device.h>

#include <linux/err.h>

#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/of.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/thermal.h>

​

#define MD_FACTOR   1000

​

/* SPEAr Thermal Sensor Dev Structure */

struct spear_thermal_dev {

    /* pointer to base address of the thermal sensor */

    void __iomem *thermal_base;

    /* clk structure */

    struct clk *clk;

    /* pointer to thermal flags */

    unsigned int flags;

};

​

static inline int thermal_get_temp(struct thermal_zone_device *thermal,

                int *temp)

{

    struct spear_thermal_dev *stdev = thermal->devdata;

​

    /*

     * Data are ready to be read after 628 usec from POWERDOWN signal

     * (PDN) = 1

     */

    *temp = (readl_relaxed(stdev->thermal_base) & 0x7F) * MD_FACTOR;

    return 0;

}

​

static struct thermal_zone_device_ops ops = {

    .get_temp = thermal_get_temp,

};

​

static int __maybe_unused spear_thermal_suspend(struct device *dev)

{

    struct thermal_zone_device *spear_thermal = dev_get_drvdata(dev);

    struct spear_thermal_dev *stdev = spear_thermal->devdata;

    unsigned int actual_mask = 0;

​

    /* Disable SPEAr Thermal Sensor */