linux-imx

/*

 * Copyright (C) ST-Ericsson SA 2010

 *

 * License Terms: GNU General Public License v2

 * Authors: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson

 *          Bengt Jonsson <bengt.g.jonsson@stericsson.com> for ST-Ericsson

 *

 * UX500 common part of Power domain regulators

 */

​

#include <linux/kernel.h>

#include <linux/err.h>

#include <linux/regulator/driver.h>

#include <linux/debugfs.h>

#include <linux/seq_file.h>

#include <linux/slab.h>

#include <linux/module.h>

​

#include "dbx500-prcmu.h"

​

/*

 * power state reference count

 */

static int power_state_active_cnt; /* will initialize to zero */

static DEFINE_SPINLOCK(power_state_active_lock);

​

void power_state_active_enable(void)

{

    unsigned long flags;

​

    spin_lock_irqsave(&power_state_active_lock, flags);

    power_state_active_cnt++;

    spin_unlock_irqrestore(&power_state_active_lock, flags);

}

​

int power_state_active_disable(void)

{

    int ret = 0;

    unsigned long flags;

​

    spin_lock_irqsave(&power_state_active_lock, flags);

    if (power_state_active_cnt <= 0) {

        pr_err("power state: unbalanced enable/disable calls\n");

        ret = -EINVAL;

        goto out;

    }

​

    power_state_active_cnt--;

out:

    spin_unlock_irqrestore(&power_state_active_lock, flags);

    return ret;

}

​

#ifdef CONFIG_REGULATOR_DEBUG

​

static int power_state_active_get(void)

{

    unsigned long flags;

    int cnt;

​

    spin_lock_irqsave(&power_state_active_lock, flags);

    cnt = power_state_active_cnt;

    spin_unlock_irqrestore(&power_state_active_lock, flags);