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 #include <acpi/acmacros.h>
31 #include <acpi/actypes.h>
32 #include <acpi/acutils.h>
33
34 ACPI_MODULE_NAME("cm_sbs");
35 #define ACPI_AC_CLASS "ac_adapter"
36 #define ACPI_BATTERY_CLASS "battery"
37 #define ACPI_SBS_COMPONENT 0x00080000
38 #define _COMPONENT ACPI_SBS_COMPONENT
39 static struct proc_dir_entry *acpi_ac_dir;
40 static struct proc_dir_entry *acpi_battery_dir;
41
42 static DEFINE_MUTEX(cm_sbs_mutex);
43
44 static int lock_ac_dir_cnt;
45 static int lock_battery_dir_cnt;
46
47 struct proc_dir_entry *acpi_lock_ac_dir(void)
48 {
49 mutex_lock(&cm_sbs_mutex);
50 if (!acpi_ac_dir)
51 acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
52 if (acpi_ac_dir) {
53 lock_ac_dir_cnt++;
54 } else {
55 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
56 "Cannot create %s\n", ACPI_AC_CLASS));
57 }
58 mutex_unlock(&cm_sbs_mutex);
59 return acpi_ac_dir;
60 }
61 EXPORT_SYMBOL(acpi_lock_ac_dir);
62
63 void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir_param)
64 {
65 mutex_lock(&cm_sbs_mutex);
66 if (acpi_ac_dir_param)
67 lock_ac_dir_cnt--;
68 if (lock_ac_dir_cnt == 0 && acpi_ac_dir_param && acpi_ac_dir) {
69 remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
70 acpi_ac_dir = NULL;
71 }
72 mutex_unlock(&cm_sbs_mutex);
73 }
74 EXPORT_SYMBOL(acpi_unlock_ac_dir);
75
76 struct proc_dir_entry *acpi_lock_battery_dir(void)
77 {
78 mutex_lock(&cm_sbs_mutex);
79 if (!acpi_battery_dir) {
80 acpi_battery_dir =
81 proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
82 }
83 if (acpi_battery_dir) {
84 lock_battery_dir_cnt++;
85 } else {
86 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
87 "Cannot create %s\n", ACPI_BATTERY_CLASS));
88 }
89 mutex_unlock(&cm_sbs_mutex);
90 return acpi_battery_dir;
91 }
92 EXPORT_SYMBOL(acpi_lock_battery_dir);
93
94 void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir_param)
95 {
96 mutex_lock(&cm_sbs_mutex);
97 if (acpi_battery_dir_param)
98 lock_battery_dir_cnt--;
99 if (lock_battery_dir_cnt == 0 && acpi_battery_dir_param
100 && acpi_battery_dir) {
101 remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
102 acpi_battery_dir = NULL;
103 }
104 mutex_unlock(&cm_sbs_mutex);
105 return;
106 }
107 EXPORT_SYMBOL(acpi_unlock_battery_dir);
108
109 static int __init acpi_cm_sbs_init(void)
110 {
111 return 0;
112 }
113 subsys_initcall(acpi_cm_sbs_init);
114
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