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