LXR linux/drivers/acpi/cm

   1/*
   2 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   3 *
   4 *  This program is free software; you can redistribute it and/or modify
   5 *  it under the terms of the GNU General Public License as published by
   6 *  the Free Software Foundation; either version 2 of the License, or (at
   7 *  your option) any later version.
   8 *
   9 *  This program is distributed in the hope that it will be useful, but
  10 *  WITHOUT ANY WARRANTY; without even the implied warranty of
  11 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 *  General Public License for more details.
  13 *
  14 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  15 */
  16
  17#include <linux/kernel.h>
  18#include <linux/module.h>
  19#include <linux/init.h>
  20#include <linux/acpi.h>
  21#include <linux/types.h>
  22#include <linux/proc_fs.h>
  23#include <linux/seq_file.h>
  24#include <acpi/acpi_bus.h>
  25#include <acpi/acpi_drivers.h>
  26
  27#define PREFIX "ACPI: "
  28
  29ACPI_MODULE_NAME("cm_sbs");
  30#define ACPI_AC_CLASS           "ac_adapter"
  31#define ACPI_BATTERY_CLASS      "battery"
  32#define _COMPONENT              ACPI_SBS_COMPONENT
  33static struct proc_dir_entry *acpi_ac_dir;
  34static struct proc_dir_entry *acpi_battery_dir;
  35
  36static DEFINE_MUTEX(cm_sbs_mutex);
  37
  38static int lock_ac_dir_cnt;
  39static int lock_battery_dir_cnt;
  40
  41struct proc_dir_entry *acpi_lock_ac_dir(void)
  42{
  43        mutex_lock(&cm_sbs_mutex);
  44        if (!acpi_ac_dir)
  45                acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
  46        if (acpi_ac_dir) {
  47                lock_ac_dir_cnt++;
  48        } else {
  49                printk(KERN_ERR PREFIX
  50                                  "Cannot create %s\n", ACPI_AC_CLASS);
  51        }
  52        mutex_unlock(&cm_sbs_mutex);
  53        return acpi_ac_dir;
  54}
  55EXPORT_SYMBOL(acpi_lock_ac_dir);
  56
  57void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir_param)
  58{
  59        mutex_lock(&cm_sbs_mutex);
  60        if (acpi_ac_dir_param)
  61                lock_ac_dir_cnt--;
  62        if (lock_ac_dir_cnt == 0 && acpi_ac_dir_param && acpi_ac_dir) {
  63                remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
  64                acpi_ac_dir = NULL;
  65        }
  66        mutex_unlock(&cm_sbs_mutex);
  67}
  68EXPORT_SYMBOL(acpi_unlock_ac_dir);
  69
  70struct proc_dir_entry *acpi_lock_battery_dir(void)
  71{
  72        mutex_lock(&cm_sbs_mutex);
  73        if (!acpi_battery_dir) {
  74                acpi_battery_dir =
  75                    proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
  76        }
  77        if (acpi_battery_dir) {
  78                lock_battery_dir_cnt++;
  79        } else {
  80                printk(KERN_ERR PREFIX
  81                                  "Cannot create %s\n", ACPI_BATTERY_CLASS);
  82        }
  83        mutex_unlock(&cm_sbs_mutex);
  84        return acpi_battery_dir;
  85}
  86EXPORT_SYMBOL(acpi_lock_battery_dir);
  87
  88void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir_param)
  89{
  90        mutex_lock(&cm_sbs_mutex);
  91        if (acpi_battery_dir_param)
  92                lock_battery_dir_cnt--;
  93        if (lock_battery_dir_cnt == 0 && acpi_battery_dir_param
  94            && acpi_battery_dir) {
  95                remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
  96                acpi_battery_dir = NULL;
  97        }
  98        mutex_unlock(&cm_sbs_mutex);
  99        return;
 100}
 101EXPORT_SYMBOL(acpi_unlock_battery_dir);
 102