| Thomas Gleixner | c942fdd | 2019-05-27 08:55:06 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| Lan Tianyu | e2a7c3d | 2014-05-04 11:07:24 +0800 | [diff] [blame] | 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 | |
| 15 | ACPI_MODULE_NAME("cm_sbs"); |
| 16 | #define ACPI_AC_CLASS "ac_adapter" |
| 17 | #define ACPI_BATTERY_CLASS "battery" |
| 18 | #define _COMPONENT ACPI_SBS_COMPONENT |
| 19 | static struct proc_dir_entry *acpi_ac_dir; |
| 20 | static struct proc_dir_entry *acpi_battery_dir; |
| 21 | |
| 22 | static DEFINE_MUTEX(cm_sbs_mutex); |
| 23 | |
| 24 | static int lock_ac_dir_cnt; |
| 25 | static int lock_battery_dir_cnt; |
| 26 | |
| 27 | struct 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 | } |
| 41 | EXPORT_SYMBOL(acpi_lock_ac_dir); |
| 42 | |
| 43 | void 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 | } |
| 54 | EXPORT_SYMBOL(acpi_unlock_ac_dir); |
| 55 | |
| 56 | struct 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 | } |
| 72 | EXPORT_SYMBOL(acpi_lock_battery_dir); |
| 73 | |
| 74 | void 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 | } |
| 87 | EXPORT_SYMBOL(acpi_unlock_battery_dir); |