| | 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); |
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