1// SPDX-License-Identifier: GPL-2.0-or-later
 2
 3#include <linux/kernel.h>
 4#include <linux/module.h>
 5#include <linux/init.h>
 6#include <linux/acpi.h>
 7#include <linux/types.h>
 8#include <linux/proc_fs.h>
 9#include <linux/seq_file.h>
10#include <acpi/acpi_bus.h>
11#include <acpi/acpi_drivers.h>
12
13#define PREFIX "ACPI: "
14
15ACPI_MODULE_NAME("cm_sbs");
16#define ACPI_AC_CLASS		"ac_adapter"
17#define ACPI_BATTERY_CLASS	"battery"
18#define _COMPONENT		ACPI_SBS_COMPONENT
19static struct proc_dir_entry *acpi_ac_dir;
20static struct proc_dir_entry *acpi_battery_dir;
21
22static DEFINE_MUTEX(cm_sbs_mutex);
23
24static int lock_ac_dir_cnt;
25static int lock_battery_dir_cnt;
26
27struct proc_dir_entry *acpi_lock_ac_dir(void)
28{
29	mutex_lock(&cm_sbs_mutex);
30	if (!acpi_ac_dir)
31		acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);
32	if (acpi_ac_dir) {
33		lock_ac_dir_cnt++;
34	} else {
35		printk(KERN_ERR PREFIX
36				  "Cannot create %s\n", ACPI_AC_CLASS);
37	}
38	mutex_unlock(&cm_sbs_mutex);
39	return acpi_ac_dir;
40}
41EXPORT_SYMBOL(acpi_lock_ac_dir);
42
43void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir_param)
44{
45	mutex_lock(&cm_sbs_mutex);
46	if (acpi_ac_dir_param)
47		lock_ac_dir_cnt--;
48	if (lock_ac_dir_cnt == 0 && acpi_ac_dir_param && acpi_ac_dir) {
49		remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);
50		acpi_ac_dir = NULL;
51	}
52	mutex_unlock(&cm_sbs_mutex);
53}
54EXPORT_SYMBOL(acpi_unlock_ac_dir);
55
56struct proc_dir_entry *acpi_lock_battery_dir(void)
57{
58	mutex_lock(&cm_sbs_mutex);
59	if (!acpi_battery_dir) {
60		acpi_battery_dir =
61		    proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);
62	}
63	if (acpi_battery_dir) {
64		lock_battery_dir_cnt++;
65	} else {
66		printk(KERN_ERR PREFIX
67				  "Cannot create %s\n", ACPI_BATTERY_CLASS);
68	}
69	mutex_unlock(&cm_sbs_mutex);
70	return acpi_battery_dir;
71}
72EXPORT_SYMBOL(acpi_lock_battery_dir);
73
74void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir_param)
75{
76	mutex_lock(&cm_sbs_mutex);
77	if (acpi_battery_dir_param)
78		lock_battery_dir_cnt--;
79	if (lock_battery_dir_cnt == 0 && acpi_battery_dir_param
80	    && acpi_battery_dir) {
81		remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);
82		acpi_battery_dir = NULL;
83	}
84	mutex_unlock(&cm_sbs_mutex);
85	return;
86}
87EXPORT_SYMBOL(acpi_unlock_battery_dir);