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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/drivers/acpi/cm_sbs.c
15109 views
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/*

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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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 *

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 *  This program is free software; you can redistribute it and/or modify

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 *  it under the terms of the GNU General Public License as published by

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 *  the Free Software Foundation; either version 2 of the License, or (at

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 *  your option) any later version.

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 *

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 *  This program is distributed in the hope that it will be useful, but

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 *  WITHOUT ANY WARRANTY; without even the implied warranty of

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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

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 *  General Public License for more details.

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 *

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 *  You should have received a copy of the GNU General Public License along

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 *  with this program; if not, write to the Free Software Foundation, Inc.,

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 *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

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 *

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 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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 */

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#include <linux/kernel.h>

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#include <linux/module.h>

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#include <linux/init.h>

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#include <linux/acpi.h>

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#include <linux/types.h>

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#include <linux/proc_fs.h>

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#include <linux/seq_file.h>

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#include <acpi/acpi_bus.h>

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#include <acpi/acpi_drivers.h>

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#define PREFIX "ACPI: "

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ACPI_MODULE_NAME("cm_sbs");

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#define ACPI_AC_CLASS		"ac_adapter"

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#define ACPI_BATTERY_CLASS	"battery"

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#define _COMPONENT		ACPI_SBS_COMPONENT

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static struct proc_dir_entry *acpi_ac_dir;

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static struct proc_dir_entry *acpi_battery_dir;

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static DEFINE_MUTEX(cm_sbs_mutex);

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static int lock_ac_dir_cnt;

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static int lock_battery_dir_cnt;

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struct proc_dir_entry *acpi_lock_ac_dir(void)

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{

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	mutex_lock(&cm_sbs_mutex);

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	if (!acpi_ac_dir)

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		acpi_ac_dir = proc_mkdir(ACPI_AC_CLASS, acpi_root_dir);

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	if (acpi_ac_dir) {

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		lock_ac_dir_cnt++;

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	} else {

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		printk(KERN_ERR PREFIX

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				  "Cannot create %s\n", ACPI_AC_CLASS);

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	}

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	mutex_unlock(&cm_sbs_mutex);

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	return acpi_ac_dir;

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}

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EXPORT_SYMBOL(acpi_lock_ac_dir);

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void acpi_unlock_ac_dir(struct proc_dir_entry *acpi_ac_dir_param)

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{

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	mutex_lock(&cm_sbs_mutex);

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	if (acpi_ac_dir_param)

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		lock_ac_dir_cnt--;

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	if (lock_ac_dir_cnt == 0 && acpi_ac_dir_param && acpi_ac_dir) {

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		remove_proc_entry(ACPI_AC_CLASS, acpi_root_dir);

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		acpi_ac_dir = NULL;

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	}

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	mutex_unlock(&cm_sbs_mutex);

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}

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EXPORT_SYMBOL(acpi_unlock_ac_dir);

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struct proc_dir_entry *acpi_lock_battery_dir(void)

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{

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	mutex_lock(&cm_sbs_mutex);

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	if (!acpi_battery_dir) {

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		acpi_battery_dir =

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		    proc_mkdir(ACPI_BATTERY_CLASS, acpi_root_dir);

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	}

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	if (acpi_battery_dir) {

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		lock_battery_dir_cnt++;

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	} else {

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		printk(KERN_ERR PREFIX

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				  "Cannot create %s\n", ACPI_BATTERY_CLASS);

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	}

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	mutex_unlock(&cm_sbs_mutex);

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	return acpi_battery_dir;

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}

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EXPORT_SYMBOL(acpi_lock_battery_dir);

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void acpi_unlock_battery_dir(struct proc_dir_entry *acpi_battery_dir_param)

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{

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	mutex_lock(&cm_sbs_mutex);

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	if (acpi_battery_dir_param)

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		lock_battery_dir_cnt--;

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	if (lock_battery_dir_cnt == 0 && acpi_battery_dir_param

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	    && acpi_battery_dir) {

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		remove_proc_entry(ACPI_BATTERY_CLASS, acpi_root_dir);

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		acpi_battery_dir = NULL;

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	}

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	mutex_unlock(&cm_sbs_mutex);

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	return;

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}

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EXPORT_SYMBOL(acpi_unlock_battery_dir);

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