drivers/acpi/button.c - kernel/msm-4.9 - Gitiles

 /*
  *  button.c - ACPI Button Driver
  *
  *  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 <linux/input.h>
 #include <linux/slab.h>
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
 #include <acpi/button.h>

 #define PREFIX "ACPI: "

 #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"
 #define ACPI_BUTTON_TYPE_POWER		0x01

 #define ACPI_BUTTON_SUBCLASS_SLEEP	"sleep"
 #define ACPI_BUTTON_HID_SLEEP		"PNP0C0E"
 #define ACPI_BUTTON_DEVICE_NAME_SLEEP	"Sleep Button"
 #define ACPI_BUTTON_TYPE_SLEEP		0x03

 #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("button");

 MODULE_AUTHOR("Paul Diefenbaugh");
 MODULE_DESCRIPTION("ACPI Button Driver");
 MODULE_LICENSE("GPL");

 static const struct acpi_device_id button_device_ids[] = {
 	{ACPI_BUTTON_HID_LID,    0},
 	{ACPI_BUTTON_HID_SLEEP,  0},
 	{ACPI_BUTTON_HID_SLEEPF, 0},
 	{ACPI_BUTTON_HID_POWER,  0},
 	{ACPI_BUTTON_HID_POWERF, 0},
 	{"", 0},
 };
 MODULE_DEVICE_TABLE(acpi, button_device_ids);

 static int acpi_button_add(struct acpi_device *device);
 static int acpi_button_remove(struct acpi_device *device);
 static void acpi_button_notify(struct acpi_device *device, u32 event);

 #ifdef CONFIG_PM_SLEEP
 static int acpi_button_resume(struct device *dev);
 #endif
 static SIMPLE_DEV_PM_OPS(acpi_button_pm, NULL, acpi_button_resume);

 static struct acpi_driver acpi_button_driver = {
 	.name = "button",
 	.class = ACPI_BUTTON_CLASS,
 	.ids = button_device_ids,
 	.ops = {
 		.add = acpi_button_add,
 		.remove = acpi_button_remove,
 		.notify = acpi_button_notify,
 	},
 	.drv.pm = &acpi_button_pm,
 };

 struct acpi_button {
 	unsigned int type;
 	struct input_dev *input;
 	char phys[32];			/* for input device */
 	unsigned long pushed;
 	bool wakeup_enabled;
 };

 static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
 static struct acpi_device *lid_device;

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

 static struct proc_dir_entry *acpi_button_dir;
 static struct proc_dir_entry *acpi_lid_dir;

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

 	status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
 	seq_printf(seq, "state:      %s\n",
 		   ACPI_FAILURE(status) ? "unsupported" :
 			(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_DATA(inode));
 }

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

 static int acpi_button_add_fs(struct acpi_device *device)
 {
 	struct acpi_button *button = acpi_driver_data(device);
 	struct proc_dir_entry *entry = NULL;
 	int ret = 0;

 	/* procfs I/F for ACPI lid device only */
 	if (button->type != ACPI_BUTTON_TYPE_LID)
 		return 0;

 	if (acpi_button_dir || acpi_lid_dir) {
 		printk(KERN_ERR PREFIX "More than one Lid device found!\n");
 		return -EEXIST;
 	}

 	/* create /proc/acpi/button */
 	acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
 	if (!acpi_button_dir)
 		return -ENODEV;

 	/* create /proc/acpi/button/lid */
 	acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
 	if (!acpi_lid_dir) {
 		ret = -ENODEV;
 		goto remove_button_dir;
 	}

 	/* create /proc/acpi/button/lid/LID/ */
 	acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir);
 	if (!acpi_device_dir(device)) {
 		ret = -ENODEV;
 		goto remove_lid_dir;
 	}

 	/* create /proc/acpi/button/lid/LID/state */
 	entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
 				 S_IRUGO, acpi_device_dir(device),
 				 &acpi_button_state_fops, device);
 	if (!entry) {
 		ret = -ENODEV;
 		goto remove_dev_dir;
 	}

 done:
 	return ret;

 remove_dev_dir:
 	remove_proc_entry(acpi_device_bid(device),
 			  acpi_lid_dir);
 	acpi_device_dir(device) = NULL;
 remove_lid_dir:
 	remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
 remove_button_dir:
 	remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
 	goto done;
 }

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

 	if (button->type != ACPI_BUTTON_TYPE_LID)
 		return 0;

 	remove_proc_entry(ACPI_BUTTON_FILE_STATE,
 			  acpi_device_dir(device));
 	remove_proc_entry(acpi_device_bid(device),
 			  acpi_lid_dir);
 	acpi_device_dir(device) = NULL;
 	remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
 	remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);

 	return 0;
 }

 /* --------------------------------------------------------------------------
                                 Driver Interface
    -------------------------------------------------------------------------- */
 int acpi_lid_notifier_register(struct notifier_block *nb)
 {
 	return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
 }
 EXPORT_SYMBOL(acpi_lid_notifier_register);

 int acpi_lid_notifier_unregister(struct notifier_block *nb)
 {
 	return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
 }
 EXPORT_SYMBOL(acpi_lid_notifier_unregister);

 int acpi_lid_open(void)
 {
 	acpi_status status;
 	unsigned long long state;

 	if (!lid_device)
 		return -ENODEV;

 	status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL,
 				       &state);
 	if (ACPI_FAILURE(status))
 		return -ENODEV;

 	return !!state;
 }
 EXPORT_SYMBOL(acpi_lid_open);

 static int acpi_lid_send_state(struct acpi_device *device)
 {
 	struct acpi_button *button = acpi_driver_data(device);
 	unsigned long long state;
 	acpi_status status;
 	int ret;

 	status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
 	if (ACPI_FAILURE(status))
 		return -ENODEV;

 	/* input layer checks if event is redundant */
 	input_report_switch(button->input, SW_LID, !state);
 	input_sync(button->input);

 	if (state)
 		pm_wakeup_event(&device->dev, 0);

 	ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
 	if (ret == NOTIFY_DONE)
 		ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
 						   device);
 	if (ret == NOTIFY_DONE || ret == NOTIFY_OK) {
 		/*
 		 * It is also regarded as success if the notifier_chain
 		 * returns NOTIFY_OK or NOTIFY_DONE.
 		 */
 		ret = 0;
 	}
 	return ret;
 }

 static void acpi_button_notify(struct acpi_device *device, u32 event)
 {
 	struct acpi_button *button = acpi_driver_data(device);
 	struct input_dev *input;

 	switch (event) {
 	case ACPI_FIXED_HARDWARE_EVENT:
 		event = ACPI_BUTTON_NOTIFY_STATUS;
 		/* fall through */
 	case ACPI_BUTTON_NOTIFY_STATUS:
 		input = button->input;
 		if (button->type == ACPI_BUTTON_TYPE_LID) {
 			acpi_lid_send_state(device);
 		} else {
 			int keycode = test_bit(KEY_SLEEP, input->keybit) ?
 						KEY_SLEEP : KEY_POWER;

 			input_report_key(input, keycode, 1);
 			input_sync(input);
 			input_report_key(input, keycode, 0);
 			input_sync(input);

 			pm_wakeup_event(&device->dev, 0);
 		}

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

 #ifdef CONFIG_PM_SLEEP
 static int acpi_button_resume(struct device *dev)
 {
 	struct acpi_device *device = to_acpi_device(dev);
 	struct acpi_button *button = acpi_driver_data(device);

 	if (button->type == ACPI_BUTTON_TYPE_LID)
 		return acpi_lid_send_state(device);
 	return 0;
 }
 #endif

 static int acpi_button_add(struct acpi_device *device)
 {
 	struct acpi_button *button;
 	struct input_dev *input;
 	const char *hid = acpi_device_hid(device);
 	char *name, *class;
 	int error;

 	button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
 	if (!button)
 		return -ENOMEM;

 	device->driver_data = button;

 	button->input = input = input_allocate_device();
 	if (!input) {
 		error = -ENOMEM;
 		goto err_free_button;
 	}

 	name = acpi_device_name(device);
 	class = acpi_device_class(device);

 	if (!strcmp(hid, ACPI_BUTTON_HID_POWER) ||
 	    !strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
 		button->type = ACPI_BUTTON_TYPE_POWER;
 		strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
 		sprintf(class, "%s/%s",
 			ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
 	} else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) ||
 		   !strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
 		button->type = ACPI_BUTTON_TYPE_SLEEP;
 		strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
 		sprintf(class, "%s/%s",
 			ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
 	} else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
 		button->type = ACPI_BUTTON_TYPE_LID;
 		strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
 		sprintf(class, "%s/%s",
 			ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
 	} else {
 		printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
 		error = -ENODEV;
 		goto err_free_input;
 	}

 	error = acpi_button_add_fs(device);
 	if (error)
 		goto err_free_input;

 	snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);

 	input->name = name;
 	input->phys = button->phys;
 	input->id.bustype = BUS_HOST;
 	input->id.product = button->type;
 	input->dev.parent = &device->dev;

 	switch (button->type) {
 	case ACPI_BUTTON_TYPE_POWER:
 		input->evbit[0] = BIT_MASK(EV_KEY);
 		set_bit(KEY_POWER, input->keybit);
 		break;

 	case ACPI_BUTTON_TYPE_SLEEP:
 		input->evbit[0] = BIT_MASK(EV_KEY);
 		set_bit(KEY_SLEEP, input->keybit);
 		break;

 	case ACPI_BUTTON_TYPE_LID:
 		input->evbit[0] = BIT_MASK(EV_SW);
 		set_bit(SW_LID, input->swbit);
 		break;
 	}

 	error = input_register_device(input);
 	if (error)
 		goto err_remove_fs;
 	if (button->type == ACPI_BUTTON_TYPE_LID) {
 		acpi_lid_send_state(device);
 		/*
 		 * This assumes there's only one lid device, or if there are
 		 * more we only care about the last one...
 		 */
 		lid_device = device;
 	}

 	if (device->wakeup.flags.valid) {
 		/* Button's GPE is run-wake GPE */
 		acpi_enable_gpe(device->wakeup.gpe_device,
 				device->wakeup.gpe_number);
 		if (!device_may_wakeup(&device->dev)) {
 			device_set_wakeup_enable(&device->dev, true);
 			button->wakeup_enabled = true;
 		}
 	}

 	printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
 	return 0;

  err_remove_fs:
 	acpi_button_remove_fs(device);
  err_free_input:
 	input_free_device(input);
  err_free_button:
 	kfree(button);
 	return error;
 }

 static int acpi_button_remove(struct acpi_device *device)
 {
 	struct acpi_button *button = acpi_driver_data(device);

 	if (device->wakeup.flags.valid) {
 		acpi_disable_gpe(device->wakeup.gpe_device,
 				device->wakeup.gpe_number);
 		if (button->wakeup_enabled)
 			device_set_wakeup_enable(&device->dev, false);
 	}

 	acpi_button_remove_fs(device);
 	input_unregister_device(button->input);
 	kfree(button);
 	return 0;
 }

 module_acpi_driver(acpi_button_driver);
	/*
	* button.c - ACPI Button Driver
	*
	* 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 <linux/input.h>
	#include <linux/slab.h>
	#include <acpi/acpi_bus.h>
	#include <acpi/acpi_drivers.h>
	#include <acpi/button.h>

	#define PREFIX "ACPI: "

	#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"
	#define ACPI_BUTTON_TYPE_POWER 0x01

	#define ACPI_BUTTON_SUBCLASS_SLEEP "sleep"
	#define ACPI_BUTTON_HID_SLEEP "PNP0C0E"
	#define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button"
	#define ACPI_BUTTON_TYPE_SLEEP 0x03

	#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("button");

	MODULE_AUTHOR("Paul Diefenbaugh");
	MODULE_DESCRIPTION("ACPI Button Driver");
	MODULE_LICENSE("GPL");

	static const struct acpi_device_id button_device_ids[] = {
	{ACPI_BUTTON_HID_LID, 0},
	{ACPI_BUTTON_HID_SLEEP, 0},
	{ACPI_BUTTON_HID_SLEEPF, 0},
	{ACPI_BUTTON_HID_POWER, 0},
	{ACPI_BUTTON_HID_POWERF, 0},
	{"", 0},
	};
	MODULE_DEVICE_TABLE(acpi, button_device_ids);

	static int acpi_button_add(struct acpi_device *device);
	static int acpi_button_remove(struct acpi_device *device);
	static void acpi_button_notify(struct acpi_device *device, u32 event);

	#ifdef CONFIG_PM_SLEEP
	static int acpi_button_resume(struct device *dev);
	#endif
	static SIMPLE_DEV_PM_OPS(acpi_button_pm, NULL, acpi_button_resume);

	static struct acpi_driver acpi_button_driver = {
	.name = "button",
	.class = ACPI_BUTTON_CLASS,
	.ids = button_device_ids,
	.ops = {
	.add = acpi_button_add,
	.remove = acpi_button_remove,
	.notify = acpi_button_notify,
	},
	.drv.pm = &acpi_button_pm,
	};

	struct acpi_button {
	unsigned int type;
	struct input_dev *input;
	char phys[32]; /* for input device */
	unsigned long pushed;
	bool wakeup_enabled;
	};

	static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
	static struct acpi_device *lid_device;

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

	static struct proc_dir_entry *acpi_button_dir;
	static struct proc_dir_entry *acpi_lid_dir;

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

	status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
	seq_printf(seq, "state: %s\n",
	ACPI_FAILURE(status) ? "unsupported" :
	(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_DATA(inode));
	}

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

	static int acpi_button_add_fs(struct acpi_device *device)
	{
	struct acpi_button *button = acpi_driver_data(device);
	struct proc_dir_entry *entry = NULL;
	int ret = 0;

	/* procfs I/F for ACPI lid device only */
	if (button->type != ACPI_BUTTON_TYPE_LID)
	return 0;

	if (acpi_button_dir \|\| acpi_lid_dir) {
	printk(KERN_ERR PREFIX "More than one Lid device found!\n");
	return -EEXIST;
	}

	/* create /proc/acpi/button */
	acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
	if (!acpi_button_dir)
	return -ENODEV;

	/* create /proc/acpi/button/lid */
	acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
	if (!acpi_lid_dir) {
	ret = -ENODEV;
	goto remove_button_dir;
	}

	/* create /proc/acpi/button/lid/LID/ */
	acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir);
	if (!acpi_device_dir(device)) {
	ret = -ENODEV;
	goto remove_lid_dir;
	}

	/* create /proc/acpi/button/lid/LID/state */
	entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
	S_IRUGO, acpi_device_dir(device),
	&acpi_button_state_fops, device);
	if (!entry) {
	ret = -ENODEV;
	goto remove_dev_dir;
	}

	done:
	return ret;

	remove_dev_dir:
	remove_proc_entry(acpi_device_bid(device),
	acpi_lid_dir);
	acpi_device_dir(device) = NULL;
	remove_lid_dir:
	remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
	remove_button_dir:
	remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
	goto done;
	}

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

	if (button->type != ACPI_BUTTON_TYPE_LID)
	return 0;

	remove_proc_entry(ACPI_BUTTON_FILE_STATE,
	acpi_device_dir(device));
	remove_proc_entry(acpi_device_bid(device),
	acpi_lid_dir);
	acpi_device_dir(device) = NULL;
	remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
	remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);

	return 0;
	}

	/* --------------------------------------------------------------------------
	Driver Interface
	-------------------------------------------------------------------------- */
	int acpi_lid_notifier_register(struct notifier_block *nb)
	{
	return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
	}
	EXPORT_SYMBOL(acpi_lid_notifier_register);

	int acpi_lid_notifier_unregister(struct notifier_block *nb)
	{
	return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
	}
	EXPORT_SYMBOL(acpi_lid_notifier_unregister);

	int acpi_lid_open(void)
	{
	acpi_status status;
	unsigned long long state;

	if (!lid_device)
	return -ENODEV;

	status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL,
	&state);
	if (ACPI_FAILURE(status))
	return -ENODEV;

	return !!state;
	}
	EXPORT_SYMBOL(acpi_lid_open);

	static int acpi_lid_send_state(struct acpi_device *device)
	{
	struct acpi_button *button = acpi_driver_data(device);
	unsigned long long state;
	acpi_status status;
	int ret;

	status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
	if (ACPI_FAILURE(status))
	return -ENODEV;

	/* input layer checks if event is redundant */
	input_report_switch(button->input, SW_LID, !state);
	input_sync(button->input);

	if (state)
	pm_wakeup_event(&device->dev, 0);

	ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
	if (ret == NOTIFY_DONE)
	ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
	device);
	if (ret == NOTIFY_DONE \|\| ret == NOTIFY_OK) {
	/*
	* It is also regarded as success if the notifier_chain
	* returns NOTIFY_OK or NOTIFY_DONE.
	*/
	ret = 0;
	}
	return ret;
	}

	static void acpi_button_notify(struct acpi_device *device, u32 event)
	{
	struct acpi_button *button = acpi_driver_data(device);
	struct input_dev *input;

	switch (event) {
	case ACPI_FIXED_HARDWARE_EVENT:
	event = ACPI_BUTTON_NOTIFY_STATUS;
	/* fall through */
	case ACPI_BUTTON_NOTIFY_STATUS:
	input = button->input;
	if (button->type == ACPI_BUTTON_TYPE_LID) {
	acpi_lid_send_state(device);
	} else {
	int keycode = test_bit(KEY_SLEEP, input->keybit) ?
	KEY_SLEEP : KEY_POWER;

	input_report_key(input, keycode, 1);
	input_sync(input);
	input_report_key(input, keycode, 0);
	input_sync(input);

	pm_wakeup_event(&device->dev, 0);
	}

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

	#ifdef CONFIG_PM_SLEEP
	static int acpi_button_resume(struct device *dev)
	{
	struct acpi_device *device = to_acpi_device(dev);
	struct acpi_button *button = acpi_driver_data(device);

	if (button->type == ACPI_BUTTON_TYPE_LID)
	return acpi_lid_send_state(device);
	return 0;
	}
	#endif

	static int acpi_button_add(struct acpi_device *device)
	{
	struct acpi_button *button;
	struct input_dev *input;
	const char *hid = acpi_device_hid(device);
	char name, class;
	int error;

	button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
	if (!button)
	return -ENOMEM;

	device->driver_data = button;

	button->input = input = input_allocate_device();
	if (!input) {
	error = -ENOMEM;
	goto err_free_button;
	}

	name = acpi_device_name(device);
	class = acpi_device_class(device);

	if (!strcmp(hid, ACPI_BUTTON_HID_POWER) \|\|
	!strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
	button->type = ACPI_BUTTON_TYPE_POWER;
	strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
	sprintf(class, "%s/%s",
	ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
	} else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) \|\|
	!strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
	button->type = ACPI_BUTTON_TYPE_SLEEP;
	strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
	sprintf(class, "%s/%s",
	ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
	} else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
	button->type = ACPI_BUTTON_TYPE_LID;
	strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
	sprintf(class, "%s/%s",
	ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
	} else {
	printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
	error = -ENODEV;
	goto err_free_input;
	}

	error = acpi_button_add_fs(device);
	if (error)
	goto err_free_input;

	snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);

	input->name = name;
	input->phys = button->phys;
	input->id.bustype = BUS_HOST;
	input->id.product = button->type;
	input->dev.parent = &device->dev;

	switch (button->type) {
	case ACPI_BUTTON_TYPE_POWER:
	input->evbit[0] = BIT_MASK(EV_KEY);
	set_bit(KEY_POWER, input->keybit);
	break;

	case ACPI_BUTTON_TYPE_SLEEP:
	input->evbit[0] = BIT_MASK(EV_KEY);
	set_bit(KEY_SLEEP, input->keybit);
	break;

	case ACPI_BUTTON_TYPE_LID:
	input->evbit[0] = BIT_MASK(EV_SW);
	set_bit(SW_LID, input->swbit);
	break;
	}

	error = input_register_device(input);
	if (error)
	goto err_remove_fs;
	if (button->type == ACPI_BUTTON_TYPE_LID) {
	acpi_lid_send_state(device);
	/*
	* This assumes there's only one lid device, or if there are
	* more we only care about the last one...
	*/
	lid_device = device;
	}

	if (device->wakeup.flags.valid) {
	/* Button's GPE is run-wake GPE */
	acpi_enable_gpe(device->wakeup.gpe_device,
	device->wakeup.gpe_number);
	if (!device_may_wakeup(&device->dev)) {
	device_set_wakeup_enable(&device->dev, true);
	button->wakeup_enabled = true;
	}
	}

	printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
	return 0;

	err_remove_fs:
	acpi_button_remove_fs(device);
	err_free_input:
	input_free_device(input);
	err_free_button:
	kfree(button);
	return error;
	}

	static int acpi_button_remove(struct acpi_device *device)
	{
	struct acpi_button *button = acpi_driver_data(device);

	if (device->wakeup.flags.valid) {
	acpi_disable_gpe(device->wakeup.gpe_device,
	device->wakeup.gpe_number);
	if (button->wakeup_enabled)
	device_set_wakeup_enable(&device->dev, false);
	}

	acpi_button_remove_fs(device);
	input_unregister_device(button->input);
	kfree(button);
	return 0;
	}

	module_acpi_driver(acpi_button_driver);