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