drivers/acpi/button.c - kernel/msm-4.19 - Gitiles

 /*
  *  acpi_button.c - ACPI Button Driver ($Revision: 30 $)
  *
  *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
  *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or (at
  *  your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful, but
  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  *  General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License along
  *  with this program; if not, write to the Free Software Foundation, Inc.,
  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  *
  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/init.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 ACPI_BUTTON_COMPONENT		0x00080000
 #define ACPI_BUTTON_DRIVER_NAME		"ACPI Button Driver"
 #define ACPI_BUTTON_CLASS		"button"
 #define ACPI_BUTTON_FILE_INFO		"info"
 #define ACPI_BUTTON_FILE_STATE		"state"
 #define ACPI_BUTTON_TYPE_UNKNOWN	0x00
 #define ACPI_BUTTON_NOTIFY_STATUS	0x80

 #define ACPI_BUTTON_SUBCLASS_POWER	"power"
 #define ACPI_BUTTON_HID_POWER		"PNP0C0C"
 #define ACPI_BUTTON_DEVICE_NAME_POWER	"Power Button (CM)"
 #define ACPI_BUTTON_DEVICE_NAME_POWERF	"Power Button (FF)"
 #define ACPI_BUTTON_TYPE_POWER		0x01
 #define ACPI_BUTTON_TYPE_POWERF		0x02

 #define ACPI_BUTTON_SUBCLASS_SLEEP	"sleep"
 #define ACPI_BUTTON_HID_SLEEP		"PNP0C0E"
 #define ACPI_BUTTON_DEVICE_NAME_SLEEP	"Sleep Button (CM)"
 #define ACPI_BUTTON_DEVICE_NAME_SLEEPF	"Sleep Button (FF)"
 #define ACPI_BUTTON_TYPE_SLEEP		0x03
 #define ACPI_BUTTON_TYPE_SLEEPF		0x04

 #define ACPI_BUTTON_SUBCLASS_LID	"lid"
 #define ACPI_BUTTON_HID_LID		"PNP0C0D"
 #define ACPI_BUTTON_DEVICE_NAME_LID	"Lid Switch"
 #define ACPI_BUTTON_TYPE_LID		0x05

 #define _COMPONENT		ACPI_BUTTON_COMPONENT
 ACPI_MODULE_NAME("acpi_button")

     MODULE_AUTHOR("Paul Diefenbaugh");
 MODULE_DESCRIPTION(ACPI_BUTTON_DRIVER_NAME);
 MODULE_LICENSE("GPL");

 static int acpi_button_add(struct acpi_device *device);
 static int acpi_button_remove(struct acpi_device *device, int type);
 static int acpi_button_info_open_fs(struct inode *inode, struct file *file);
 static int acpi_button_state_open_fs(struct inode *inode, struct file *file);

 static struct acpi_driver acpi_button_driver = {
 	.name = ACPI_BUTTON_DRIVER_NAME,
 	.class = ACPI_BUTTON_CLASS,
 	.ids = "ACPI_FPB,ACPI_FSB,PNP0C0D,PNP0C0C,PNP0C0E",
 	.ops = {
 		.add = acpi_button_add,
 		.remove = acpi_button_remove,
 		},
 };

 struct acpi_button {
 	struct acpi_device *device;	/* Fixed button kludge */
 	u8 type;
 	unsigned long pushed;
 };

 static struct file_operations acpi_button_info_fops = {
 	.open = acpi_button_info_open_fs,
 	.read = seq_read,
 	.llseek = seq_lseek,
 	.release = single_release,
 };

 static struct file_operations acpi_button_state_fops = {
 	.open = acpi_button_state_open_fs,
 	.read = seq_read,
 	.llseek = seq_lseek,
 	.release = single_release,
 };

 /* --------------------------------------------------------------------------
                               FS Interface (/proc)
    -------------------------------------------------------------------------- */

 static struct proc_dir_entry *acpi_button_dir;

 static int acpi_button_info_seq_show(struct seq_file *seq, void *offset)
 {
 	struct acpi_button *button = (struct acpi_button *)seq->private;


 	if (!button || !button->device)
 		return 0;

 	seq_printf(seq, "type:                    %s\n",
 		   acpi_device_name(button->device));

 	return 0;
 }

 static int acpi_button_info_open_fs(struct inode *inode, struct file *file)
 {
 	return single_open(file, acpi_button_info_seq_show, PDE(inode)->data);
 }

 static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
 {
 	struct acpi_button *button = (struct acpi_button *)seq->private;
 	acpi_status status;
 	unsigned long state;


 	if (!button || !button->device)
 		return 0;

 	status = acpi_evaluate_integer(button->device->handle, "_LID", NULL, &state);
 	if (ACPI_FAILURE(status)) {
 		seq_printf(seq, "state:      unsupported\n");
 	} else {
 		seq_printf(seq, "state:      %s\n",
 			   (state ? "open" : "closed"));
 	}

 	return 0;
 }

 static int acpi_button_state_open_fs(struct inode *inode, struct file *file)
 {
 	return single_open(file, acpi_button_state_seq_show, PDE(inode)->data);
 }

 static struct proc_dir_entry *acpi_power_dir;
 static struct proc_dir_entry *acpi_sleep_dir;
 static struct proc_dir_entry *acpi_lid_dir;

 static int acpi_button_add_fs(struct acpi_device *device)
 {
 	struct proc_dir_entry *entry = NULL;
 	struct acpi_button *button = NULL;


 	if (!device || !acpi_driver_data(device))
 		return -EINVAL;

 	button = acpi_driver_data(device);

 	switch (button->type) {
 	case ACPI_BUTTON_TYPE_POWER:
 	case ACPI_BUTTON_TYPE_POWERF:
 		if (!acpi_power_dir)
 			acpi_power_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER,
 						    acpi_button_dir);
 		entry = acpi_power_dir;
 		break;
 	case ACPI_BUTTON_TYPE_SLEEP:
 	case ACPI_BUTTON_TYPE_SLEEPF:
 		if (!acpi_sleep_dir)
 			acpi_sleep_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP,
 						    acpi_button_dir);
 		entry = acpi_sleep_dir;
 		break;
 	case ACPI_BUTTON_TYPE_LID:
 		if (!acpi_lid_dir)
 			acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID,
 						  acpi_button_dir);
 		entry = acpi_lid_dir;
 		break;
 	}

 	if (!entry)
 		return -ENODEV;
 	entry->owner = THIS_MODULE;

 	acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
 	if (!acpi_device_dir(device))
 		return -ENODEV;
 	acpi_device_dir(device)->owner = THIS_MODULE;

 	/* 'info' [R] */
 	entry = create_proc_entry(ACPI_BUTTON_FILE_INFO,
 				  S_IRUGO, acpi_device_dir(device));
 	if (!entry)
 		return -ENODEV;
 	else {
 		entry->proc_fops = &acpi_button_info_fops;
 		entry->data = acpi_driver_data(device);
 		entry->owner = THIS_MODULE;
 	}

 	/* show lid state [R] */
 	if (button->type == ACPI_BUTTON_TYPE_LID) {
 		entry = create_proc_entry(ACPI_BUTTON_FILE_STATE,
 					  S_IRUGO, acpi_device_dir(device));
 		if (!entry)
 			return -ENODEV;
 		else {
 			entry->proc_fops = &acpi_button_state_fops;
 			entry->data = acpi_driver_data(device);
 			entry->owner = THIS_MODULE;
 		}
 	}

 	return 0;
 }

 static int acpi_button_remove_fs(struct acpi_device *device)
 {
 	struct acpi_button *button = NULL;


 	button = acpi_driver_data(device);
 	if (acpi_device_dir(device)) {
 		if (button->type == ACPI_BUTTON_TYPE_LID)
 			remove_proc_entry(ACPI_BUTTON_FILE_STATE,
 					  acpi_device_dir(device));
 		remove_proc_entry(ACPI_BUTTON_FILE_INFO,
 				  acpi_device_dir(device));

 		remove_proc_entry(acpi_device_bid(device),
 				  acpi_device_dir(device)->parent);
 		acpi_device_dir(device) = NULL;
 	}

 	return 0;
 }

 /* --------------------------------------------------------------------------
                                 Driver Interface
    -------------------------------------------------------------------------- */

 static void acpi_button_notify(acpi_handle handle, u32 event, void *data)
 {
 	struct acpi_button *button = (struct acpi_button *)data;


 	if (!button || !button->device)
 		return;

 	switch (event) {
 	case ACPI_BUTTON_NOTIFY_STATUS:
 		acpi_bus_generate_event(button->device, event,
 					++button->pushed);
 		break;
 	default:
 		ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 				  "Unsupported event [0x%x]\n", event));
 		break;
 	}

 	return;
 }

 static acpi_status acpi_button_notify_fixed(void *data)
 {
 	struct acpi_button *button = (struct acpi_button *)data;


 	if (!button)
 		return AE_BAD_PARAMETER;

 	acpi_button_notify(button->device->handle, ACPI_BUTTON_NOTIFY_STATUS, button);

 	return AE_OK;
 }

 static int acpi_button_add(struct acpi_device *device)
 {
 	int result = 0;
 	acpi_status status = AE_OK;
 	struct acpi_button *button = NULL;


 	if (!device)
 		return -EINVAL;

 	button = kmalloc(sizeof(struct acpi_button), GFP_KERNEL);
 	if (!button)
 		return -ENOMEM;
 	memset(button, 0, sizeof(struct acpi_button));

 	button->device = device;
 	acpi_driver_data(device) = button;

 	/*
 	 * Determine the button type (via hid), as fixed-feature buttons
 	 * need to be handled a bit differently than generic-space.
 	 */
 	if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWER)) {
 		button->type = ACPI_BUTTON_TYPE_POWER;
 		strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_POWER);
 		sprintf(acpi_device_class(device), "%s/%s",
 			ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
 	} else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF)) {
 		button->type = ACPI_BUTTON_TYPE_POWERF;
 		strcpy(acpi_device_name(device),
 		       ACPI_BUTTON_DEVICE_NAME_POWERF);
 		sprintf(acpi_device_class(device), "%s/%s",
 			ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
 	} else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEP)) {
 		button->type = ACPI_BUTTON_TYPE_SLEEP;
 		strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_SLEEP);
 		sprintf(acpi_device_class(device), "%s/%s",
 			ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
 	} else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF)) {
 		button->type = ACPI_BUTTON_TYPE_SLEEPF;
 		strcpy(acpi_device_name(device),
 		       ACPI_BUTTON_DEVICE_NAME_SLEEPF);
 		sprintf(acpi_device_class(device), "%s/%s",
 			ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
 	} else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_LID)) {
 		button->type = ACPI_BUTTON_TYPE_LID;
 		strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_LID);
 		sprintf(acpi_device_class(device), "%s/%s",
 			ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
 	} else {
 		printk(KERN_ERR PREFIX "Unsupported hid [%s]\n",
 			    acpi_device_hid(device));
 		result = -ENODEV;
 		goto end;
 	}

 	result = acpi_button_add_fs(device);
 	if (result)
 		goto end;

 	switch (button->type) {
 	case ACPI_BUTTON_TYPE_POWERF:
 		status =
 		    acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 						     acpi_button_notify_fixed,
 						     button);
 		break;
 	case ACPI_BUTTON_TYPE_SLEEPF:
 		status =
 		    acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 						     acpi_button_notify_fixed,
 						     button);
 		break;
 	default:
 		status = acpi_install_notify_handler(device->handle,
 						     ACPI_DEVICE_NOTIFY,
 						     acpi_button_notify,
 						     button);
 		break;
 	}

 	if (ACPI_FAILURE(status)) {
 		result = -ENODEV;
 		goto end;
 	}

 	if (device->wakeup.flags.valid) {
 		/* Button's GPE is run-wake GPE */
 		acpi_set_gpe_type(device->wakeup.gpe_device,
 				  device->wakeup.gpe_number,
 				  ACPI_GPE_TYPE_WAKE_RUN);
 		acpi_enable_gpe(device->wakeup.gpe_device,
 				device->wakeup.gpe_number, ACPI_NOT_ISR);
 		device->wakeup.state.enabled = 1;
 	}

 	printk(KERN_INFO PREFIX "%s [%s]\n",
 	       acpi_device_name(device), acpi_device_bid(device));

       end:
 	if (result) {
 		acpi_button_remove_fs(device);
 		kfree(button);
 	}

 	return result;
 }

 static int acpi_button_remove(struct acpi_device *device, int type)
 {
 	acpi_status status = 0;
 	struct acpi_button *button = NULL;


 	if (!device || !acpi_driver_data(device))
 		return -EINVAL;

 	button = acpi_driver_data(device);

 	/* Unregister for device notifications. */
 	switch (button->type) {
 	case ACPI_BUTTON_TYPE_POWERF:
 		status =
 		    acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
 						    acpi_button_notify_fixed);
 		break;
 	case ACPI_BUTTON_TYPE_SLEEPF:
 		status =
 		    acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
 						    acpi_button_notify_fixed);
 		break;
 	default:
 		status = acpi_remove_notify_handler(device->handle,
 						    ACPI_DEVICE_NOTIFY,
 						    acpi_button_notify);
 		break;
 	}

 	acpi_button_remove_fs(device);

 	kfree(button);

 	return 0;
 }

 static int __init acpi_button_init(void)
 {
 	int result = 0;


 	acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
 	if (!acpi_button_dir)
 		return -ENODEV;
 	acpi_button_dir->owner = THIS_MODULE;
 	result = acpi_bus_register_driver(&acpi_button_driver);
 	if (result < 0) {
 		remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
 		return -ENODEV;
 	}

 	return 0;
 }

 static void __exit acpi_button_exit(void)
 {

 	acpi_bus_unregister_driver(&acpi_button_driver);

 	if (acpi_power_dir)
 		remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, acpi_button_dir);
 	if (acpi_sleep_dir)
 		remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, acpi_button_dir);
 	if (acpi_lid_dir)
 		remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
 	remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);

 	return;
 }

 module_init(acpi_button_init);
 module_exit(acpi_button_exit);
	/*
	* acpi_button.c - ACPI Button Driver ($Revision: 30 $)
	*
	* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
	* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
	*
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or (at
	* your option) any later version.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	* General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License along
	* with this program; if not, write to the Free Software Foundation, Inc.,
	* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
	*
	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/init.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 ACPI_BUTTON_COMPONENT 0x00080000
	#define ACPI_BUTTON_DRIVER_NAME "ACPI Button Driver"
	#define ACPI_BUTTON_CLASS "button"
	#define ACPI_BUTTON_FILE_INFO "info"
	#define ACPI_BUTTON_FILE_STATE "state"
	#define ACPI_BUTTON_TYPE_UNKNOWN 0x00
	#define ACPI_BUTTON_NOTIFY_STATUS 0x80

	#define ACPI_BUTTON_SUBCLASS_POWER "power"
	#define ACPI_BUTTON_HID_POWER "PNP0C0C"
	#define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button (CM)"
	#define ACPI_BUTTON_DEVICE_NAME_POWERF "Power Button (FF)"
	#define ACPI_BUTTON_TYPE_POWER 0x01
	#define ACPI_BUTTON_TYPE_POWERF 0x02

	#define ACPI_BUTTON_SUBCLASS_SLEEP "sleep"
	#define ACPI_BUTTON_HID_SLEEP "PNP0C0E"
	#define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button (CM)"
	#define ACPI_BUTTON_DEVICE_NAME_SLEEPF "Sleep Button (FF)"
	#define ACPI_BUTTON_TYPE_SLEEP 0x03
	#define ACPI_BUTTON_TYPE_SLEEPF 0x04

	#define ACPI_BUTTON_SUBCLASS_LID "lid"
	#define ACPI_BUTTON_HID_LID "PNP0C0D"
	#define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch"
	#define ACPI_BUTTON_TYPE_LID 0x05

	#define _COMPONENT ACPI_BUTTON_COMPONENT
	ACPI_MODULE_NAME("acpi_button")

	MODULE_AUTHOR("Paul Diefenbaugh");
	MODULE_DESCRIPTION(ACPI_BUTTON_DRIVER_NAME);
	MODULE_LICENSE("GPL");

	static int acpi_button_add(struct acpi_device *device);
	static int acpi_button_remove(struct acpi_device *device, int type);
	static int acpi_button_info_open_fs(struct inode inode, struct file file);
	static int acpi_button_state_open_fs(struct inode inode, struct file file);

	static struct acpi_driver acpi_button_driver = {
	.name = ACPI_BUTTON_DRIVER_NAME,
	.class = ACPI_BUTTON_CLASS,
	.ids = "ACPI_FPB,ACPI_FSB,PNP0C0D,PNP0C0C,PNP0C0E",
	.ops = {
	.add = acpi_button_add,
	.remove = acpi_button_remove,
	},
	};

	struct acpi_button {
	struct acpi_device device; / Fixed button kludge */
	u8 type;
	unsigned long pushed;
	};

	static struct file_operations acpi_button_info_fops = {
	.open = acpi_button_info_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	};

	static struct file_operations acpi_button_state_fops = {
	.open = acpi_button_state_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	};

	/* --------------------------------------------------------------------------
	FS Interface (/proc)
	-------------------------------------------------------------------------- */

	static struct proc_dir_entry *acpi_button_dir;

	static int acpi_button_info_seq_show(struct seq_file seq, void offset)
	{
	struct acpi_button button = (struct acpi_button )seq->private;


	if (!button \|\| !button->device)
	return 0;

	seq_printf(seq, "type: %s\n",
	acpi_device_name(button->device));

	return 0;
	}

	static int acpi_button_info_open_fs(struct inode inode, struct file file)
	{
	return single_open(file, acpi_button_info_seq_show, PDE(inode)->data);
	}

	static int acpi_button_state_seq_show(struct seq_file seq, void offset)
	{
	struct acpi_button button = (struct acpi_button )seq->private;
	acpi_status status;
	unsigned long state;


	if (!button \|\| !button->device)
	return 0;

	status = acpi_evaluate_integer(button->device->handle, "_LID", NULL, &state);
	if (ACPI_FAILURE(status)) {
	seq_printf(seq, "state: unsupported\n");
	} else {
	seq_printf(seq, "state: %s\n",
	(state ? "open" : "closed"));
	}

	return 0;
	}

	static int acpi_button_state_open_fs(struct inode inode, struct file file)
	{
	return single_open(file, acpi_button_state_seq_show, PDE(inode)->data);
	}

	static struct proc_dir_entry *acpi_power_dir;
	static struct proc_dir_entry *acpi_sleep_dir;
	static struct proc_dir_entry *acpi_lid_dir;

	static int acpi_button_add_fs(struct acpi_device *device)
	{
	struct proc_dir_entry *entry = NULL;
	struct acpi_button *button = NULL;


	if (!device \|\| !acpi_driver_data(device))
	return -EINVAL;

	button = acpi_driver_data(device);

	switch (button->type) {
	case ACPI_BUTTON_TYPE_POWER:
	case ACPI_BUTTON_TYPE_POWERF:
	if (!acpi_power_dir)
	acpi_power_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER,
	acpi_button_dir);
	entry = acpi_power_dir;
	break;
	case ACPI_BUTTON_TYPE_SLEEP:
	case ACPI_BUTTON_TYPE_SLEEPF:
	if (!acpi_sleep_dir)
	acpi_sleep_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP,
	acpi_button_dir);
	entry = acpi_sleep_dir;
	break;
	case ACPI_BUTTON_TYPE_LID:
	if (!acpi_lid_dir)
	acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID,
	acpi_button_dir);
	entry = acpi_lid_dir;
	break;
	}

	if (!entry)
	return -ENODEV;
	entry->owner = THIS_MODULE;

	acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
	if (!acpi_device_dir(device))
	return -ENODEV;
	acpi_device_dir(device)->owner = THIS_MODULE;

	/* 'info' [R] */
	entry = create_proc_entry(ACPI_BUTTON_FILE_INFO,
	S_IRUGO, acpi_device_dir(device));
	if (!entry)
	return -ENODEV;
	else {
	entry->proc_fops = &acpi_button_info_fops;
	entry->data = acpi_driver_data(device);
	entry->owner = THIS_MODULE;
	}

	/* show lid state [R] */
	if (button->type == ACPI_BUTTON_TYPE_LID) {
	entry = create_proc_entry(ACPI_BUTTON_FILE_STATE,
	S_IRUGO, acpi_device_dir(device));
	if (!entry)
	return -ENODEV;
	else {
	entry->proc_fops = &acpi_button_state_fops;
	entry->data = acpi_driver_data(device);
	entry->owner = THIS_MODULE;
	}
	}

	return 0;
	}

	static int acpi_button_remove_fs(struct acpi_device *device)
	{
	struct acpi_button *button = NULL;


	button = acpi_driver_data(device);
	if (acpi_device_dir(device)) {
	if (button->type == ACPI_BUTTON_TYPE_LID)
	remove_proc_entry(ACPI_BUTTON_FILE_STATE,
	acpi_device_dir(device));
	remove_proc_entry(ACPI_BUTTON_FILE_INFO,
	acpi_device_dir(device));

	remove_proc_entry(acpi_device_bid(device),
	acpi_device_dir(device)->parent);
	acpi_device_dir(device) = NULL;
	}

	return 0;
	}

	/* --------------------------------------------------------------------------
	Driver Interface
	-------------------------------------------------------------------------- */

	static void acpi_button_notify(acpi_handle handle, u32 event, void *data)
	{
	struct acpi_button button = (struct acpi_button )data;


	if (!button \|\| !button->device)
	return;

	switch (event) {
	case ACPI_BUTTON_NOTIFY_STATUS:
	acpi_bus_generate_event(button->device, event,
	++button->pushed);
	break;
	default:
	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
	"Unsupported event [0x%x]\n", event));
	break;
	}

	return;
	}

	static acpi_status acpi_button_notify_fixed(void *data)
	{
	struct acpi_button button = (struct acpi_button )data;


	if (!button)
	return AE_BAD_PARAMETER;

	acpi_button_notify(button->device->handle, ACPI_BUTTON_NOTIFY_STATUS, button);

	return AE_OK;
	}

	static int acpi_button_add(struct acpi_device *device)
	{
	int result = 0;
	acpi_status status = AE_OK;
	struct acpi_button *button = NULL;


	if (!device)
	return -EINVAL;

	button = kmalloc(sizeof(struct acpi_button), GFP_KERNEL);
	if (!button)
	return -ENOMEM;
	memset(button, 0, sizeof(struct acpi_button));

	button->device = device;
	acpi_driver_data(device) = button;

	/*
	* Determine the button type (via hid), as fixed-feature buttons
	* need to be handled a bit differently than generic-space.
	*/
	if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWER)) {
	button->type = ACPI_BUTTON_TYPE_POWER;
	strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_POWER);
	sprintf(acpi_device_class(device), "%s/%s",
	ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
	} else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_POWERF)) {
	button->type = ACPI_BUTTON_TYPE_POWERF;
	strcpy(acpi_device_name(device),
	ACPI_BUTTON_DEVICE_NAME_POWERF);
	sprintf(acpi_device_class(device), "%s/%s",
	ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
	} else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEP)) {
	button->type = ACPI_BUTTON_TYPE_SLEEP;
	strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_SLEEP);
	sprintf(acpi_device_class(device), "%s/%s",
	ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
	} else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_SLEEPF)) {
	button->type = ACPI_BUTTON_TYPE_SLEEPF;
	strcpy(acpi_device_name(device),
	ACPI_BUTTON_DEVICE_NAME_SLEEPF);
	sprintf(acpi_device_class(device), "%s/%s",
	ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
	} else if (!strcmp(acpi_device_hid(device), ACPI_BUTTON_HID_LID)) {
	button->type = ACPI_BUTTON_TYPE_LID;
	strcpy(acpi_device_name(device), ACPI_BUTTON_DEVICE_NAME_LID);
	sprintf(acpi_device_class(device), "%s/%s",
	ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
	} else {
	printk(KERN_ERR PREFIX "Unsupported hid [%s]\n",
	acpi_device_hid(device));
	result = -ENODEV;
	goto end;
	}

	result = acpi_button_add_fs(device);
	if (result)
	goto end;

	switch (button->type) {
	case ACPI_BUTTON_TYPE_POWERF:
	status =
	acpi_install_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
	acpi_button_notify_fixed,
	button);
	break;
	case ACPI_BUTTON_TYPE_SLEEPF:
	status =
	acpi_install_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
	acpi_button_notify_fixed,
	button);
	break;
	default:
	status = acpi_install_notify_handler(device->handle,
	ACPI_DEVICE_NOTIFY,
	acpi_button_notify,
	button);
	break;
	}

	if (ACPI_FAILURE(status)) {
	result = -ENODEV;
	goto end;
	}

	if (device->wakeup.flags.valid) {
	/* Button's GPE is run-wake GPE */
	acpi_set_gpe_type(device->wakeup.gpe_device,
	device->wakeup.gpe_number,
	ACPI_GPE_TYPE_WAKE_RUN);
	acpi_enable_gpe(device->wakeup.gpe_device,
	device->wakeup.gpe_number, ACPI_NOT_ISR);
	device->wakeup.state.enabled = 1;
	}

	printk(KERN_INFO PREFIX "%s [%s]\n",
	acpi_device_name(device), acpi_device_bid(device));

	end:
	if (result) {
	acpi_button_remove_fs(device);
	kfree(button);
	}

	return result;
	}

	static int acpi_button_remove(struct acpi_device *device, int type)
	{
	acpi_status status = 0;
	struct acpi_button *button = NULL;


	if (!device \|\| !acpi_driver_data(device))
	return -EINVAL;

	button = acpi_driver_data(device);

	/* Unregister for device notifications. */
	switch (button->type) {
	case ACPI_BUTTON_TYPE_POWERF:
	status =
	acpi_remove_fixed_event_handler(ACPI_EVENT_POWER_BUTTON,
	acpi_button_notify_fixed);
	break;
	case ACPI_BUTTON_TYPE_SLEEPF:
	status =
	acpi_remove_fixed_event_handler(ACPI_EVENT_SLEEP_BUTTON,
	acpi_button_notify_fixed);
	break;
	default:
	status = acpi_remove_notify_handler(device->handle,
	ACPI_DEVICE_NOTIFY,
	acpi_button_notify);
	break;
	}

	acpi_button_remove_fs(device);

	kfree(button);

	return 0;
	}

	static int __init acpi_button_init(void)
	{
	int result = 0;


	acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
	if (!acpi_button_dir)
	return -ENODEV;
	acpi_button_dir->owner = THIS_MODULE;
	result = acpi_bus_register_driver(&acpi_button_driver);
	if (result < 0) {
	remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
	return -ENODEV;
	}

	return 0;
	}

	static void __exit acpi_button_exit(void)
	{

	acpi_bus_unregister_driver(&acpi_button_driver);

	if (acpi_power_dir)
	remove_proc_entry(ACPI_BUTTON_SUBCLASS_POWER, acpi_button_dir);
	if (acpi_sleep_dir)
	remove_proc_entry(ACPI_BUTTON_SUBCLASS_SLEEP, acpi_button_dir);
	if (acpi_lid_dir)
	remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
	remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);

	return;
	}

	module_init(acpi_button_init);
	module_exit(acpi_button_exit);