powerpc/32: Allow __ioremap on RAM addresses for kdump kernel
[linux-2.6/mini2440.git] / drivers / acpi / cm_sbs.c
blob307963bd10436c896e85766f23fc2ad6a6c85ad2
1 /*
2 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.
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.
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.
18 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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>
34 ACPI_MODULE_NAME("cm_sbs");
35 #define ACPI_AC_CLASS "ac_adapter"
36 #define ACPI_BATTERY_CLASS "battery"
37 #define _COMPONENT ACPI_SBS_COMPONENT
38 static struct proc_dir_entry *acpi_ac_dir;
39 static struct proc_dir_entry *acpi_battery_dir;
41 static DEFINE_MUTEX(cm_sbs_mutex);
43 static int lock_ac_dir_cnt;
44 static int lock_battery_dir_cnt;
46 struct proc_dir_entry *acpi_lock_ac_dir(void)
48 mutex_lock(&cm_sbs_mutex);
49 if (!acpi_ac_dir)
50 acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
51 if (acpi_ac_dir) {
52 lock_ac_dir_cnt++;
53 } else {
54 printk(KERN_ERR PREFIX
55 "Cannot create %s\n", ACPI_AC_CLASS);
57 mutex_unlock(&cm_sbs_mutex);
58 return acpi_ac_dir;
60 EXPORT_SYMBOL(acpi_lock_ac_dir);
62 void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir_param)
64 mutex_lock(&cm_sbs_mutex);
65 if (acpi_ac_dir_param)
66 lock_ac_dir_cnt--;
67 if (lock_ac_dir_cnt == 0 && acpi_ac_dir_param && acpi_ac_dir) {
68 remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
69 acpi_ac_dir = NULL;
71 mutex_unlock(&cm_sbs_mutex);
73 EXPORT_SYMBOL(acpi_unlock_ac_dir);
75 struct proc_dir_entry *acpi_lock_battery_dir(void)
77 mutex_lock(&cm_sbs_mutex);
78 if (!acpi_battery_dir) {
79 acpi_battery_dir =
80 proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
82 if (acpi_battery_dir) {
83 lock_battery_dir_cnt++;
84 } else {
85 printk(KERN_ERR PREFIX
86 "Cannot create %s\n", ACPI_BATTERY_CLASS);
88 mutex_unlock(&cm_sbs_mutex);
89 return acpi_battery_dir;
91 EXPORT_SYMBOL(acpi_lock_battery_dir);
93 void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir_param)
95 mutex_lock(&cm_sbs_mutex);
96 if (acpi_battery_dir_param)
97 lock_battery_dir_cnt--;
98 if (lock_battery_dir_cnt == 0 && acpi_battery_dir_param
99 && acpi_battery_dir) {
100 remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
101 acpi_battery_dir = NULL;
103 mutex_unlock(&cm_sbs_mutex);
104 return;
106 EXPORT_SYMBOL(acpi_unlock_battery_dir);