linux-imx

/*

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * 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.

 *

 * Copyright (C) 2012 ARM Limited

 */

​

#include <linux/delay.h>

#include <linux/notifier.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/platform_device.h>

#include <linux/reboot.h>

#include <linux/stat.h>

#include <linux/vexpress.h>

​

static void vexpress_reset_do(struct device *dev, const char *what)

{

    int err = -ENOENT;

    struct regmap *reg = dev_get_drvdata(dev);

​

    if (reg) {

        err = regmap_write(reg, 0, 0);

        if (!err)

            mdelay(1000);

    }

​

    dev_emerg(dev, "Unable to %s (%d)\n", what, err);

}

​

static struct device *vexpress_power_off_device;

static atomic_t vexpress_restart_nb_refcnt = ATOMIC_INIT(0);

​

static void vexpress_power_off(void)

{

    vexpress_reset_do(vexpress_power_off_device, "power off");

}

​

static struct device *vexpress_restart_device;

​

static int vexpress_restart(struct notifier_block *this, unsigned long mode,

                 void *cmd)

{

    vexpress_reset_do(vexpress_restart_device, "restart");

​

    return NOTIFY_DONE;

}

​

static struct notifier_block vexpress_restart_nb = {

    .notifier_call = vexpress_restart,

    .priority = 128,

};

​

static ssize_t vexpress_reset_active_show(struct device *dev,

        struct device_attribute *attr, char *buf)

{

    return sprintf(buf, "%d\n", vexpress_restart_device == dev);