drivers/acpi/cm_sbs.c

   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 #include <acpi/acmacros.h>
  31 #include <acpi/actypes.h>
  32 #include <acpi/acutils.h>
  33
  34 ACPI_MODULE_NAME("cm_sbs");
  35 #define ACPI_AC_CLASS           "ac_adapter"
  36 #define ACPI_BATTERY_CLASS      "battery"
  37 #define ACPI_SBS_COMPONENT      0x00080000
  38 #define _COMPONENT              ACPI_SBS_COMPONENT
  39 static struct proc_dir_entry *acpi_ac_dir;
  40 static struct proc_dir_entry *acpi_battery_dir;
  41
  42 static DEFINE_MUTEX(cm_sbs_mutex);
  43
  44 static int lock_ac_dir_cnt;
  45 static int lock_battery_dir_cnt;
  46
  47 struct proc_dir_entry *acpi_lock_ac_dir(void)
  48 {
  49         mutex_lock(&cm_sbs_mutex);
  50         if (!acpi_ac_dir)
  51                 acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
  52         if (acpi_ac_dir) {
  53                 lock_ac_dir_cnt++;
  54         } else {
  55                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
  56                                   "Cannot create %s\n", ACPI_AC_CLASS));
  57         }
  58         mutex_unlock(&cm_sbs_mutex);
  59         return acpi_ac_dir;
  60 }
  61 EXPORT_SYMBOL(acpi_lock_ac_dir);
  62
  63 void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir_param)
  64 {
  65         mutex_lock(&cm_sbs_mutex);
  66         if (acpi_ac_dir_param)
  67                 lock_ac_dir_cnt--;
  68         if (lock_ac_dir_cnt == 0 && acpi_ac_dir_param && acpi_ac_dir) {
  69                 remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
  70                 acpi_ac_dir = NULL;
  71         }
  72         mutex_unlock(&cm_sbs_mutex);
  73 }
  74 EXPORT_SYMBOL(acpi_unlock_ac_dir);
  75
  76 struct proc_dir_entry *acpi_lock_battery_dir(void)
  77 {
  78         mutex_lock(&cm_sbs_mutex);
  79         if (!acpi_battery_dir) {
  80                 acpi_battery_dir =
  81                     proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
  82         }
  83         if (acpi_battery_dir) {
  84                 lock_battery_dir_cnt++;
  85         } else {
  86                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
  87                                   "Cannot create %s\n", ACPI_BATTERY_CLASS));
  88         }
  89         mutex_unlock(&cm_sbs_mutex);
  90         return acpi_battery_dir;
  91 }
  92 EXPORT_SYMBOL(acpi_lock_battery_dir);
  93
  94 void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir_param)
  95 {
  96         mutex_lock(&cm_sbs_mutex);
  97         if (acpi_battery_dir_param)
  98                 lock_battery_dir_cnt--;
  99         if (lock_battery_dir_cnt == 0 && acpi_battery_dir_param
 100             && acpi_battery_dir) {
 101                 remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
 102                 acpi_battery_dir = NULL;
 103         }
 104         mutex_unlock(&cm_sbs_mutex);
 105         return;
 106 }
 107 EXPORT_SYMBOL(acpi_unlock_battery_dir);
 108
 109 static int __init acpi_cm_sbs_init(void)
 110 {
 111         return 0;
 112 }
 113 subsys_initcall(acpi_cm_sbs_init);