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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
15 */
16
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/init.h>
20#include <linux/acpi.h>
21#include <linux/types.h>
22#include <linux/proc_fs.h>
23#include <linux/seq_file.h>
24#include <acpi/acpi_bus.h>
25#include <acpi/acpi_drivers.h>
26
27#define PREFIX "ACPI: "
28
29ACPI_MODULE_NAME("cm_sbs");
30#define ACPI_AC_CLASS		"ac_adapter"
31#define ACPI_BATTERY_CLASS	"battery"
32#define _COMPONENT		ACPI_SBS_COMPONENT
33static struct proc_dir_entry *acpi_ac_dir;
34static struct proc_dir_entry *acpi_battery_dir;
35
36static DEFINE_MUTEX(cm_sbs_mutex);
37
38static int lock_ac_dir_cnt;
39static int lock_battery_dir_cnt;
40
41struct proc_dir_entry *acpi_lock_ac_dir(void)
42{
43	mutex_lock(&cm_sbs_mutex);
44	if (!acpi_ac_dir)
45		acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
46	if (acpi_ac_dir) {
47		lock_ac_dir_cnt++;
48	} else {
49		printk(KERN_ERR PREFIX
50				  "Cannot create %s\n", ACPI_AC_CLASS);
51	}
52	mutex_unlock(&cm_sbs_mutex);
53	return acpi_ac_dir;
54}
55EXPORT_SYMBOL(acpi_lock_ac_dir);
56
57void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir_param)
58{
59	mutex_lock(&cm_sbs_mutex);
60	if (acpi_ac_dir_param)
61		lock_ac_dir_cnt--;
62	if (lock_ac_dir_cnt == 0 && acpi_ac_dir_param && acpi_ac_dir) {
63		remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
64		acpi_ac_dir = NULL;
65	}
66	mutex_unlock(&cm_sbs_mutex);
67}
68EXPORT_SYMBOL(acpi_unlock_ac_dir);
69
70struct proc_dir_entry *acpi_lock_battery_dir(void)
71{
72	mutex_lock(&cm_sbs_mutex);
73	if (!acpi_battery_dir) {
74		acpi_battery_dir =
75		    proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
76	}
77	if (acpi_battery_dir) {
78		lock_battery_dir_cnt++;
79	} else {
80		printk(KERN_ERR PREFIX
81				  "Cannot create %s\n", ACPI_BATTERY_CLASS);
82	}
83	mutex_unlock(&cm_sbs_mutex);
84	return acpi_battery_dir;
85}
86EXPORT_SYMBOL(acpi_lock_battery_dir);
87
88void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir_param)
89{
90	mutex_lock(&cm_sbs_mutex);
91	if (acpi_battery_dir_param)
92		lock_battery_dir_cnt--;
93	if (lock_battery_dir_cnt == 0 && acpi_battery_dir_param
94	    && acpi_battery_dir) {
95		remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
96		acpi_battery_dir = NULL;
97	}
98	mutex_unlock(&cm_sbs_mutex);
99	return;
100}
101EXPORT_SYMBOL(acpi_unlock_battery_dir);
102