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 struct semaphore cm_sbs_sem;
  43
  44 static int lock_ac_dir_cnt = 0;
  45 static int lock_battery_dir_cnt = 0;
  46
  47 struct proc_dir_entry *acpi_lock_ac_dir(void)
  48 {
  49         ACPI_FUNCTION_TRACE("acpi_lock_ac_dir");
  50
  51         down(&cm_sbs_sem);
  52         if (!acpi_ac_dir) {
  53                 acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
  54         }
  55         if (acpi_ac_dir) {
  56                 lock_ac_dir_cnt++;
  57         } else {
  58                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
  59                                   "Cannot create %s\n", ACPI_AC_CLASS));
  60         }
  61         up(&cm_sbs_sem);
  62         return (acpi_ac_dir);
  63 }
  64
  65 EXPORT_SYMBOL(acpi_lock_ac_dir);
  66
  67 void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir_param)
  68 {
  69         ACPI_FUNCTION_TRACE("acpi_unlock_ac_dir");
  70
  71         down(&cm_sbs_sem);
  72         if (acpi_ac_dir_param) {
  73                 lock_ac_dir_cnt--;
  74         }
  75         if (lock_ac_dir_cnt == 0 && acpi_ac_dir_param && acpi_ac_dir) {
  76                 remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
  77                 acpi_ac_dir = 0;
  78         }
  79         up(&cm_sbs_sem);
  80 }
  81
  82 EXPORT_SYMBOL(acpi_unlock_ac_dir);
  83
  84 struct proc_dir_entry *acpi_lock_battery_dir(void)
  85 {
  86         ACPI_FUNCTION_TRACE("acpi_lock_battery_dir");
  87
  88         down(&cm_sbs_sem);
  89         if (!acpi_battery_dir) {
  90                 acpi_battery_dir =
  91                     proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
  92         }
  93         if (acpi_battery_dir) {
  94                 lock_battery_dir_cnt++;
  95         } else {
  96                 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
  97                                   "Cannot create %s\n", ACPI_BATTERY_CLASS));
  98         }
  99         up(&cm_sbs_sem);
 100         return (acpi_battery_dir);
 101 }
 102
 103 EXPORT_SYMBOL(acpi_lock_battery_dir);
 104
 105 void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir_param)
 106 {
 107         ACPI_FUNCTION_TRACE("acpi_unlock_battery_dir");
 108
 109         down(&cm_sbs_sem);
 110         if (acpi_battery_dir_param) {
 111                 lock_battery_dir_cnt--;
 112         }
 113         if (lock_battery_dir_cnt == 0 && acpi_battery_dir_param
 114             && acpi_battery_dir) {
 115                 remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
 116                 acpi_battery_dir = 0;
 117         }
 118         up(&cm_sbs_sem);
 119 }
 120
 121 EXPORT_SYMBOL(acpi_unlock_battery_dir);
 122
 123 static int __init acpi_cm_sbs_init(void)
 124 {
 125         ACPI_FUNCTION_TRACE("acpi_cm_sbs_init");
 126
 127         if (acpi_disabled)
 128                 return_VALUE(0);
 129
 130         init_MUTEX(&cm_sbs_sem);
 131
 132         return_VALUE(0);
 133 }
 134
 135 subsys_initcall(acpi_cm_sbs_init);