linux/drivers/acpi/cm_sbs.c
<<
>>
Prefs
   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 *  You should have received a copy of the GNU General Public License along
  15 *  with this program; if not, write to the Free Software Foundation, Inc.,
  16 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  17 *
  18 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  19 */
  20
  21#include <linux/kernel.h>
  22#include <linux/module.h>
  23#include <linux/init.h>
  24#include <linux/acpi.h>
  25#include <linux/types.h>
  26#include <linux/proc_fs.h>
  27#include <linux/seq_file.h>
  28#include <acpi/acpi_bus.h>
  29#include <acpi/acpi_drivers.h>
  30
  31#define PREFIX "ACPI: "
  32
  33ACPI_MODULE_NAME("cm_sbs");
  34#define ACPI_AC_CLASS           "ac_adapter"
  35#define ACPI_BATTERY_CLASS      "battery"
  36#define _COMPONENT              ACPI_SBS_COMPONENT
  37static struct proc_dir_entry *acpi_ac_dir;
  38static struct proc_dir_entry *acpi_battery_dir;
  39
  40static DEFINE_MUTEX(cm_sbs_mutex);
  41
  42static int lock_ac_dir_cnt;
  43static int lock_battery_dir_cnt;
  44
  45struct proc_dir_entry *acpi_lock_ac_dir(void)
  46{
  47        mutex_lock(&cm_sbs_mutex);
  48        if (!acpi_ac_dir)
  49                acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
  50        if (acpi_ac_dir) {
  51                lock_ac_dir_cnt++;
  52        } else {
  53                printk(KERN_ERR PREFIX
  54                                  "Cannot create %s\n", ACPI_AC_CLASS);
  55        }
  56        mutex_unlock(&cm_sbs_mutex);
  57        return acpi_ac_dir;
  58}
  59EXPORT_SYMBOL(acpi_lock_ac_dir);
  60
  61void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir_param)
  62{
  63        mutex_lock(&cm_sbs_mutex);
  64        if (acpi_ac_dir_param)
  65                lock_ac_dir_cnt--;
  66        if (lock_ac_dir_cnt == 0 && acpi_ac_dir_param && acpi_ac_dir) {
  67                remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
  68                acpi_ac_dir = NULL;
  69        }
  70        mutex_unlock(&cm_sbs_mutex);
  71}
  72EXPORT_SYMBOL(acpi_unlock_ac_dir);
  73
  74struct proc_dir_entry *acpi_lock_battery_dir(void)
  75{
  76        mutex_lock(&cm_sbs_mutex);
  77        if (!acpi_battery_dir) {
  78                acpi_battery_dir =
  79                    proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
  80        }
  81        if (acpi_battery_dir) {
  82                lock_battery_dir_cnt++;
  83        } else {
  84                printk(KERN_ERR PREFIX
  85                                  "Cannot create %s\n", ACPI_BATTERY_CLASS);
  86        }
  87        mutex_unlock(&cm_sbs_mutex);
  88        return acpi_battery_dir;
  89}
  90EXPORT_SYMBOL(acpi_lock_battery_dir);
  91
  92void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir_param)
  93{
  94        mutex_lock(&cm_sbs_mutex);
  95        if (acpi_battery_dir_param)
  96                lock_battery_dir_cnt--;
  97        if (lock_battery_dir_cnt == 0 && acpi_battery_dir_param
  98            && acpi_battery_dir) {
  99                remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
 100                acpi_battery_dir = NULL;
 101        }
 102        mutex_unlock(&cm_sbs_mutex);
 103        return;
 104}
 105EXPORT_SYMBOL(acpi_unlock_battery_dir);
 106
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.