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Diffstat (limited to 'drivers/acpi/cm_sbs.c')
-rw-r--r--drivers/acpi/cm_sbs.c131
1 files changed, 131 insertions, 0 deletions
diff --git a/drivers/acpi/cm_sbs.c b/drivers/acpi/cm_sbs.c
new file mode 100644
index 000000000000..574a75a166c5
--- /dev/null
+++ b/drivers/acpi/cm_sbs.c
@@ -0,0 +1,131 @@
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
34ACPI_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
39static struct proc_dir_entry *acpi_ac_dir;
40static struct proc_dir_entry *acpi_battery_dir;
41
42static struct semaphore cm_sbs_sem;
43
44static int lock_ac_dir_cnt = 0;
45static int lock_battery_dir_cnt = 0;
46
47struct proc_dir_entry *acpi_lock_ac_dir(void)
48{
49
50 down(&cm_sbs_sem);
51 if (!acpi_ac_dir) {
52 acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
53 }
54 if (acpi_ac_dir) {
55 lock_ac_dir_cnt++;
56 } else {
57 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
58 "Cannot create %s\n", ACPI_AC_CLASS));
59 }
60 up(&cm_sbs_sem);
61 return acpi_ac_dir;
62}
63
64EXPORT_SYMBOL(acpi_lock_ac_dir);
65
66void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir_param)
67{
68
69 down(&cm_sbs_sem);
70 if (acpi_ac_dir_param) {
71 lock_ac_dir_cnt--;
72 }
73 if (lock_ac_dir_cnt == 0 && acpi_ac_dir_param && acpi_ac_dir) {
74 remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
75 acpi_ac_dir = 0;
76 }
77 up(&cm_sbs_sem);
78}
79
80EXPORT_SYMBOL(acpi_unlock_ac_dir);
81
82struct proc_dir_entry *acpi_lock_battery_dir(void)
83{
84
85 down(&cm_sbs_sem);
86 if (!acpi_battery_dir) {
87 acpi_battery_dir =
88 proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
89 }
90 if (acpi_battery_dir) {
91 lock_battery_dir_cnt++;
92 } else {
93 ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
94 "Cannot create %s\n", ACPI_BATTERY_CLASS));
95 }
96 up(&cm_sbs_sem);
97 return acpi_battery_dir;
98}
99
100EXPORT_SYMBOL(acpi_lock_battery_dir);
101
102void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir_param)
103{
104
105 down(&cm_sbs_sem);
106 if (acpi_battery_dir_param) {
107 lock_battery_dir_cnt--;
108 }
109 if (lock_battery_dir_cnt == 0 && acpi_battery_dir_param
110 && acpi_battery_dir) {
111 remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
112 acpi_battery_dir = 0;
113 }
114 up(&cm_sbs_sem);
115 return;
116}
117
118EXPORT_SYMBOL(acpi_unlock_battery_dir);
119
120static int __init acpi_cm_sbs_init(void)
121{
122
123 if (acpi_disabled)
124 return 0;
125
126 init_MUTEX(&cm_sbs_sem);
127
128 return 0;
129}
130
131subsys_initcall(acpi_cm_sbs_init);