// SPDX-License-Identifier: GPL-2.0-or-later #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/acpi.h> #include <linux/types.h> #include <linux/proc_fs.h> #include <linux/seq_file.h> #include <acpi/acpi_bus.h> #include <acpi/acpi_drivers.h> #define PREFIX "ACPI: " ACPI_MODULE_NAME("cm_sbs"); #define ACPI_AC_CLASS "ac_adapter" #define ACPI_BATTERY_CLASS "battery" #define _COMPONENT ACPI_SBS_COMPONENT static struct proc_dir_entry *acpi_ac_dir; static struct proc_dir_entry *acpi_battery_dir; static DEFINE_MUTEX(cm_sbs_mutex); static int lock_ac_dir_cnt; static int lock_battery_dir_cnt; struct proc_dir_entry *acpi_lock_ac_dir(void) { mutex_lock(&cm_sbs_mutex); if (!acpi_ac_dir) acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir); if (acpi_ac_dir) { lock_ac_dir_cnt++; } else { printk(KERN_ERR PREFIX "Cannot create %s\n", ACPI_AC_CLASS); } mutex_unlock(&cm_sbs_mutex); return acpi_ac_dir; } EXPORT_SYMBOL(acpi_lock_ac_dir); void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir_param) { mutex_lock(&cm_sbs_mutex); if (acpi_ac_dir_param) lock_ac_dir_cnt--; if (lock_ac_dir_cnt == 0 && acpi_ac_dir_param && acpi_ac_dir) { remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir); acpi_ac_dir = NULL; } mutex_unlock(&cm_sbs_mutex); } EXPORT_SYMBOL(acpi_unlock_ac_dir); struct proc_dir_entry *acpi_lock_battery_dir(void) { mutex_lock(&cm_sbs_mutex); if (!acpi_battery_dir) { acpi_battery_dir = proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir); } if (acpi_battery_dir) { lock_battery_dir_cnt++; } else { printk(KERN_ERR PREFIX "Cannot create %s\n", ACPI_BATTERY_CLASS); } mutex_unlock(&cm_sbs_mutex); return acpi_battery_dir; } EXPORT_SYMBOL(acpi_lock_battery_dir); void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir_param) { mutex_lock(&cm_sbs_mutex); if (acpi_battery_dir_param) lock_battery_dir_cnt--; if (lock_battery_dir_cnt == 0 && acpi_battery_dir_param && acpi_battery_dir) { remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir); acpi_battery_dir = NULL; } mutex_unlock(&cm_sbs_mutex); return; } EXPORT_SYMBOL(acpi_unlock_battery_dir);