cm_sbs.c
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/*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>
ACPI_MODULE_NAME("cm_sbs");
#define ACPI_AC_CLASS "ac_adapter"
#define ACPI_BATTERY_CLASS "battery"
#define _COMPONENT ACPI_SBS_COMPONENT
static struct proc_dir_entry *acpi_ac_dir;
static struct proc_dir_entry *acpi_battery_dir;
static DEFINE_MUTEX(cm_sbs_mutex);
static int lock_ac_dir_cnt;
static int lock_battery_dir_cnt;
struct proc_dir_entry *acpi_lock_ac_dir(void)
{
mutex_lock(&cm_sbs_mutex);
if (!acpi_ac_dir)
acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
if (acpi_ac_dir) {
lock_ac_dir_cnt++;
} else {
printk(KERN_ERR PREFIX
"Cannot create %s\n", ACPI_AC_CLASS);
}
mutex_unlock(&cm_sbs_mutex);
return acpi_ac_dir;
}
EXPORT_SYMBOL(acpi_lock_ac_dir);
void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir_param)
{
mutex_lock(&cm_sbs_mutex);
if (acpi_ac_dir_param)
lock_ac_dir_cnt--;
if (lock_ac_dir_cnt == 0 && acpi_ac_dir_param && acpi_ac_dir) {
remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
acpi_ac_dir = NULL;
}
mutex_unlock(&cm_sbs_mutex);
}
EXPORT_SYMBOL(acpi_unlock_ac_dir);
struct proc_dir_entry *acpi_lock_battery_dir(void)
{
mutex_lock(&cm_sbs_mutex);
if (!acpi_battery_dir) {
acpi_battery_dir =
proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
}
if (acpi_battery_dir) {
lock_battery_dir_cnt++;
} else {
printk(KERN_ERR PREFIX
"Cannot create %s\n", ACPI_BATTERY_CLASS);
}
mutex_unlock(&cm_sbs_mutex);
return acpi_battery_dir;
}
EXPORT_SYMBOL(acpi_lock_battery_dir);
void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir_param)
{
mutex_lock(&cm_sbs_mutex);
if (acpi_battery_dir_param)
lock_battery_dir_cnt--;
if (lock_battery_dir_cnt == 0 && acpi_battery_dir_param
&& acpi_battery_dir) {
remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
acpi_battery_dir = NULL;
}
mutex_unlock(&cm_sbs_mutex);
return;
}
EXPORT_SYMBOL(acpi_unlock_battery_dir);