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