| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 | * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 15 | */ |
| 16 | |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/module.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/acpi.h> |
| 21 | #include <linux/types.h> |
| 22 | #include <linux/proc_fs.h> |
| 23 | #include <linux/seq_file.h> |
| 24 | #include <acpi/acpi_bus.h> |
| 25 | #include <acpi/acpi_drivers.h> |
| 26 | |
| 27 | #define PREFIX "ACPI: " |
| 28 | |
| 29 | ACPI_MODULE_NAME("cm_sbs"); |
| 30 | #define ACPI_AC_CLASS "ac_adapter" |
| 31 | #define ACPI_BATTERY_CLASS "battery" |
| 32 | #define _COMPONENT ACPI_SBS_COMPONENT |
| 33 | static struct proc_dir_entry *acpi_ac_dir; |
| 34 | static struct proc_dir_entry *acpi_battery_dir; |
| 35 | |
| 36 | static DEFINE_MUTEX(cm_sbs_mutex); |
| 37 | |
| 38 | static int lock_ac_dir_cnt; |
| 39 | static int lock_battery_dir_cnt; |
| 40 | |
| 41 | struct proc_dir_entry *acpi_lock_ac_dir(void) |
| 42 | { |
| 43 | mutex_lock(&cm_sbs_mutex); |
| 44 | if (!acpi_ac_dir) |
| 45 | acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir); |
| 46 | if (acpi_ac_dir) { |
| 47 | lock_ac_dir_cnt++; |
| 48 | } else { |
| 49 | printk(KERN_ERR PREFIX |
| 50 | "Cannot create %s\n", ACPI_AC_CLASS); |
| 51 | } |
| 52 | mutex_unlock(&cm_sbs_mutex); |
| 53 | return acpi_ac_dir; |
| 54 | } |
| 55 | EXPORT_SYMBOL(acpi_lock_ac_dir); |
| 56 | |
| 57 | void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir_param) |
| 58 | { |
| 59 | mutex_lock(&cm_sbs_mutex); |
| 60 | if (acpi_ac_dir_param) |
| 61 | lock_ac_dir_cnt--; |
| 62 | if (lock_ac_dir_cnt == 0 && acpi_ac_dir_param && acpi_ac_dir) { |
| 63 | remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir); |
| 64 | acpi_ac_dir = NULL; |
| 65 | } |
| 66 | mutex_unlock(&cm_sbs_mutex); |
| 67 | } |
| 68 | EXPORT_SYMBOL(acpi_unlock_ac_dir); |
| 69 | |
| 70 | struct proc_dir_entry *acpi_lock_battery_dir(void) |
| 71 | { |
| 72 | mutex_lock(&cm_sbs_mutex); |
| 73 | if (!acpi_battery_dir) { |
| 74 | acpi_battery_dir = |
| 75 | proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir); |
| 76 | } |
| 77 | if (acpi_battery_dir) { |
| 78 | lock_battery_dir_cnt++; |
| 79 | } else { |
| 80 | printk(KERN_ERR PREFIX |
| 81 | "Cannot create %s\n", ACPI_BATTERY_CLASS); |
| 82 | } |
| 83 | mutex_unlock(&cm_sbs_mutex); |
| 84 | return acpi_battery_dir; |
| 85 | } |
| 86 | EXPORT_SYMBOL(acpi_lock_battery_dir); |
| 87 | |
| 88 | void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir_param) |
| 89 | { |
| 90 | mutex_lock(&cm_sbs_mutex); |
| 91 | if (acpi_battery_dir_param) |
| 92 | lock_battery_dir_cnt--; |
| 93 | if (lock_battery_dir_cnt == 0 && acpi_battery_dir_param |
| 94 | && acpi_battery_dir) { |
| 95 | remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir); |
| 96 | acpi_battery_dir = NULL; |
| 97 | } |
| 98 | mutex_unlock(&cm_sbs_mutex); |
| 99 | return; |
| 100 | } |
| 101 | EXPORT_SYMBOL(acpi_unlock_battery_dir); |