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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 | ||
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 | ||
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 | ||
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 | ||
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); |