linux-imx

/*

 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

 *

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

 *  it under the terms of the GNU General Public License as published by

 *  the Free Software Foundation; either version 2 of the License, or (at

 *  your option) any later version.

 *

 *  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/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/acpi.h>

#include <linux/types.h>

#include <linux/proc_fs.h>

#include <linux/seq_file.h>

#include <acpi/acpi_bus.h>

#include <acpi/acpi_drivers.h>

​

#define PREFIX "ACPI: "

​

ACPI_MODULE_NAME("cm_sbs");

#define ACPI_AC_CLASS       "ac_adapter"

#define ACPI_BATTERY_CLASS  "battery"

#define _COMPONENT      ACPI_SBS_COMPONENT

static struct proc_dir_entry *acpi_ac_dir;

static struct proc_dir_entry *acpi_battery_dir;

​

static DEFINE_MUTEX(cm_sbs_mutex);

​

static int lock_ac_dir_cnt;

static int lock_battery_dir_cnt;

​

struct proc_dir_entry *acpi_lock_ac_dir(void)

{

    mutex_lock(&cm_sbs_mutex);

    if (!acpi_ac_dir)

        acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);

    if (acpi_ac_dir) {

        lock_ac_dir_cnt++;

    } else {

        printk(KERN_ERR PREFIX

                  "Cannot create %s\n", ACPI_AC_CLASS);

    }

    mutex_unlock(&cm_sbs_mutex);

    return acpi_ac_dir;

}

EXPORT_SYMBOL(acpi_lock_ac_dir);

​

void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir_param)

{

    mutex_lock(&cm_sbs_mutex);

    if (acpi_ac_dir_param)

        lock_ac_dir_cnt--;

    if (lock_ac_dir_cnt == 0 && acpi_ac_dir_param && acpi_ac_dir) {

        remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);