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