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
33 ACPI_MODULE_NAME("cm_sbs");
34 #define ACPI_AC_CLASS "ac_adapter"
35 #define ACPI_BATTERY_CLASS "battery"
36 #define _COMPONENT ACPI_SBS_COMPONENT
37 static struct proc_dir_entry *acpi_ac_dir;
38 static struct proc_dir_entry *acpi_battery_dir;
39
40 static DEFINE_MUTEX(cm_sbs_mutex);
41
42 static int lock_ac_dir_cnt;
43 static int lock_battery_dir_cnt;
44
acpi_lock_ac_dir(void)45 struct 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 }
59 EXPORT_SYMBOL(acpi_lock_ac_dir);
60
acpi_unlock_ac_dir(struct proc_dir_entry * acpi_ac_dir_param)61 void 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 }
72 EXPORT_SYMBOL(acpi_unlock_ac_dir);
73
acpi_lock_battery_dir(void)74 struct 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 }
90 EXPORT_SYMBOL(acpi_lock_battery_dir);
91
acpi_unlock_battery_dir(struct proc_dir_entry * acpi_battery_dir_param)92 void 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 }
105 EXPORT_SYMBOL(acpi_unlock_battery_dir);
106