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