[mirror_ubuntu-artful-kernel.git] / drivers / acpi / button.c

/*
 *  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 <linux/acpi.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_suspend(struct device *dev);
static int acpi_button_resume(struct device *dev);
#else
#define acpi_button_suspend NULL
#define acpi_button_resume NULL
#endif
static SIMPLE_DEV_PM_OPS(acpi_button_pm, acpi_button_suspend, 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 suspended;
};

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;

			pm_wakeup_event(&device->dev, 0);
			if (button->suspended)
				break;

			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);

			acpi_bus_generate_netlink_event(
					device->pnp.device_class,
					dev_name(&device->dev),
					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_suspend(struct device *dev)
{
	struct acpi_device *device = to_acpi_device(dev);
	struct acpi_button *button = acpi_driver_data(device);

	button->suspended = true;
	return 0;
}

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

	button->suspended = false;
	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_set_capability(input, EV_KEY, KEY_POWER);
		break;

	case ACPI_BUTTON_TYPE_SLEEP:
		input_set_capability(input, EV_KEY, KEY_SLEEP);
		break;

	case ACPI_BUTTON_TYPE_LID:
		input_set_capability(input, EV_SW, SW_LID);
		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;
	}

	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);

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

module_acpi_driver(acpi_button_driver);
Commit	Line	Data
1da177e4	1	/*
50a4da89	2	* button.c - ACPI Button Driver
1da177e4 LT	3	*
	4	* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
	5	* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
	6	*
	7	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or (at
	12	* your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License along
	20	* with this program; if not, write to the Free Software Foundation, Inc.,
	21	* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
	22	*
	23	* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
	24	*/
	25
	26	#include <linux/kernel.h>
	27	#include <linux/module.h>
	28	#include <linux/init.h>
b34a8030 AS	29	#include <linux/types.h>
	30	#include <linux/proc_fs.h>
	31	#include <linux/seq_file.h>
c0968f0e	32	#include <linux/input.h>
5a0e3ad6	33	#include <linux/slab.h>
8b48463f	34	#include <linux/acpi.h>
6270da6f	35	#include <acpi/button.h>
1da177e4	36
a192a958 LB	37	#define PREFIX "ACPI: "
a192a958 LB	38
1da177e4	39	#define ACPI_BUTTON_CLASS "button"
b34a8030 AS	40	#define ACPI_BUTTON_FILE_INFO "info"
	41	#define ACPI_BUTTON_FILE_STATE "state"
	42	#define ACPI_BUTTON_TYPE_UNKNOWN 0x00
1da177e4 LT	43	#define ACPI_BUTTON_NOTIFY_STATUS 0x80
	44
	45	#define ACPI_BUTTON_SUBCLASS_POWER "power"
4be44fcd	46	#define ACPI_BUTTON_HID_POWER "PNP0C0C"
d68b597c	47	#define ACPI_BUTTON_DEVICE_NAME_POWER "Power Button"
1da177e4	48	#define ACPI_BUTTON_TYPE_POWER 0x01
1da177e4 LT	49
	50	#define ACPI_BUTTON_SUBCLASS_SLEEP "sleep"
	51	#define ACPI_BUTTON_HID_SLEEP "PNP0C0E"
d68b597c	52	#define ACPI_BUTTON_DEVICE_NAME_SLEEP "Sleep Button"
1da177e4	53	#define ACPI_BUTTON_TYPE_SLEEP 0x03
1da177e4 LT	54
	55	#define ACPI_BUTTON_SUBCLASS_LID "lid"
	56	#define ACPI_BUTTON_HID_LID "PNP0C0D"
	57	#define ACPI_BUTTON_DEVICE_NAME_LID "Lid Switch"
	58	#define ACPI_BUTTON_TYPE_LID 0x05
	59
	60	#define _COMPONENT ACPI_BUTTON_COMPONENT
f52fd66d	61	ACPI_MODULE_NAME("button");
1da177e4	62
c0968f0e	63	MODULE_AUTHOR("Paul Diefenbaugh");
7cda93e0	64	MODULE_DESCRIPTION("ACPI Button Driver");
1da177e4 LT	65	MODULE_LICENSE("GPL");
1da177e4 LT	66
1ba90e3a TR	67	static const struct acpi_device_id button_device_ids[] = {
	68	{ACPI_BUTTON_HID_LID, 0},
	69	{ACPI_BUTTON_HID_SLEEP, 0},
	70	{ACPI_BUTTON_HID_SLEEPF, 0},
	71	{ACPI_BUTTON_HID_POWER, 0},
	72	{ACPI_BUTTON_HID_POWERF, 0},
	73	{"", 0},
	74	};
	75	MODULE_DEVICE_TABLE(acpi, button_device_ids);
	76
4be44fcd	77	static int acpi_button_add(struct acpi_device *device);
51fac838	78	static int acpi_button_remove(struct acpi_device *device);
373cfc36	79	static void acpi_button_notify(struct acpi_device *device, u32 event);
1da177e4	80
90692404	81	#ifdef CONFIG_PM_SLEEP
e71eeb2a	82	static int acpi_button_suspend(struct device *dev);
1be532de	83	static int acpi_button_resume(struct device *dev);
2de9fd17	84	#else
e71eeb2a	85	#define acpi_button_suspend NULL
2de9fd17	86	#define acpi_button_resume NULL
90692404	87	#endif
e71eeb2a	88	static SIMPLE_DEV_PM_OPS(acpi_button_pm, acpi_button_suspend, acpi_button_resume);
1be532de	89
1da177e4	90	static struct acpi_driver acpi_button_driver = {
c2b6705b	91	.name = "button",
4be44fcd	92	.class = ACPI_BUTTON_CLASS,
1ba90e3a	93	.ids = button_device_ids,
4be44fcd LB	94	.ops = {
	95	.add = acpi_button_add,
	96	.remove = acpi_button_remove,
373cfc36	97	.notify = acpi_button_notify,
c0968f0e	98	},
1be532de	99	.drv.pm = &acpi_button_pm,
1da177e4 LT	100	};
	101
	102	struct acpi_button {
c0968f0e DT	103	unsigned int type;
	104	struct input_dev *input;
	105	char phys[32]; /* for input device */
4be44fcd	106	unsigned long pushed;
e71eeb2a	107	bool suspended;
1da177e4 LT	108	};
1da177e4 LT	109
7e12715e JB	110	static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
	111	static struct acpi_device *lid_device;
	112
b34a8030 AS	113	/* --------------------------------------------------------------------------
	114	FS Interface (/proc)
	115	-------------------------------------------------------------------------- */
	116
4be44fcd	117	static struct proc_dir_entry *acpi_button_dir;
912b7427	118	static struct proc_dir_entry *acpi_lid_dir;
4be44fcd	119
b34a8030 AS	120	static int acpi_button_state_seq_show(struct seq_file seq, void offset)
b34a8030 AS	121	{
106c19e7	122	struct acpi_device *device = seq->private;
4be44fcd	123	acpi_status status;
27663c58	124	unsigned long long state;
b34a8030	125
106c19e7	126	status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
c0968f0e DT	127	seq_printf(seq, "state: %s\n",
	128	ACPI_FAILURE(status) ? "unsupported" :
	129	(state ? "open" : "closed"));
d550d98d	130	return 0;
b34a8030 AS	131	}
	132
	133	static int acpi_button_state_open_fs(struct inode inode, struct file file)
	134	{
d9dda78b	135	return single_open(file, acpi_button_state_seq_show, PDE_DATA(inode));
b34a8030 AS	136	}
b34a8030 AS	137
912b7427 ZR	138	static const struct file_operations acpi_button_state_fops = {
	139	.owner = THIS_MODULE,
	140	.open = acpi_button_state_open_fs,
	141	.read = seq_read,
	142	.llseek = seq_lseek,
	143	.release = single_release,
	144	};
b34a8030	145
4be44fcd	146	static int acpi_button_add_fs(struct acpi_device *device)
b34a8030	147	{
1bce8113	148	struct acpi_button *button = acpi_driver_data(device);
4be44fcd	149	struct proc_dir_entry *entry = NULL;
912b7427	150	int ret = 0;
b34a8030	151
912b7427 ZR	152	/* procfs I/F for ACPI lid device only */
	153	if (button->type != ACPI_BUTTON_TYPE_LID)
	154	return 0;
	155
	156	if (acpi_button_dir \|\| acpi_lid_dir) {
	157	printk(KERN_ERR PREFIX "More than one Lid device found!\n");
	158	return -EEXIST;
b34a8030 AS	159	}
b34a8030 AS	160
912b7427 ZR	161	/* create /proc/acpi/button */
	162	acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
	163	if (!acpi_button_dir)
d550d98d	164	return -ENODEV;
b34a8030	165
912b7427 ZR	166	/* create /proc/acpi/button/lid */
	167	acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
	168	if (!acpi_lid_dir) {
	169	ret = -ENODEV;
	170	goto remove_button_dir;
	171	}
b34a8030	172
912b7427 ZR	173	/* create /proc/acpi/button/lid/LID/ */
	174	acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), acpi_lid_dir);
	175	if (!acpi_device_dir(device)) {
	176	ret = -ENODEV;
	177	goto remove_lid_dir;
	178	}
b34a8030	179
912b7427 ZR	180	/* create /proc/acpi/button/lid/LID/state */
	181	entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
	182	S_IRUGO, acpi_device_dir(device),
	183	&acpi_button_state_fops, device);
	184	if (!entry) {
	185	ret = -ENODEV;
	186	goto remove_dev_dir;
b34a8030 AS	187	}
b34a8030 AS	188
912b7427 ZR	189	done:
	190	return ret;
	191
	192	remove_dev_dir:
	193	remove_proc_entry(acpi_device_bid(device),
	194	acpi_lid_dir);
	195	acpi_device_dir(device) = NULL;
	196	remove_lid_dir:
	197	remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
	198	remove_button_dir:
	199	remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
	200	goto done;
b34a8030 AS	201	}
b34a8030 AS	202
4be44fcd	203	static int acpi_button_remove_fs(struct acpi_device *device)
b34a8030	204	{
c0968f0e	205	struct acpi_button *button = acpi_driver_data(device);
b34a8030	206
912b7427 ZR	207	if (button->type != ACPI_BUTTON_TYPE_LID)
912b7427 ZR	208	return 0;
b34a8030	209
912b7427 ZR	210	remove_proc_entry(ACPI_BUTTON_FILE_STATE,
	211	acpi_device_dir(device));
	212	remove_proc_entry(acpi_device_bid(device),
	213	acpi_lid_dir);
	214	acpi_device_dir(device) = NULL;
	215	remove_proc_entry(ACPI_BUTTON_SUBCLASS_LID, acpi_button_dir);
	216	remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
b34a8030	217
d550d98d	218	return 0;
b34a8030 AS	219	}
b34a8030 AS	220
1da177e4 LT	221	/* --------------------------------------------------------------------------
	222	Driver Interface
	223	-------------------------------------------------------------------------- */
7e12715e JB	224	int acpi_lid_notifier_register(struct notifier_block *nb)
	225	{
	226	return blocking_notifier_chain_register(&acpi_lid_notifier, nb);
	227	}
	228	EXPORT_SYMBOL(acpi_lid_notifier_register);
	229
	230	int acpi_lid_notifier_unregister(struct notifier_block *nb)
	231	{
	232	return blocking_notifier_chain_unregister(&acpi_lid_notifier, nb);
	233	}
	234	EXPORT_SYMBOL(acpi_lid_notifier_unregister);
	235
	236	int acpi_lid_open(void)
	237	{
	238	acpi_status status;
	239	unsigned long long state;
	240
2c907b72 JB	241	if (!lid_device)
	242	return -ENODEV;
	243
7e12715e JB	244	status = acpi_evaluate_integer(lid_device->handle, "_LID", NULL,
	245	&state);
	246	if (ACPI_FAILURE(status))
	247	return -ENODEV;
	248
	249	return !!state;
	250	}
	251	EXPORT_SYMBOL(acpi_lid_open);
	252
106c19e7	253	static int acpi_lid_send_state(struct acpi_device *device)
23de5d9e	254	{
106c19e7	255	struct acpi_button *button = acpi_driver_data(device);
27663c58	256	unsigned long long state;
23de5d9e	257	acpi_status status;
7e12715e	258	int ret;
23de5d9e	259
106c19e7	260	status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
23de5d9e AS	261	if (ACPI_FAILURE(status))
23de5d9e AS	262	return -ENODEV;
50a4da89	263
23de5d9e AS	264	/* input layer checks if event is redundant */
23de5d9e AS	265	input_report_switch(button->input, SW_LID, !state);
df316e93	266	input_sync(button->input);
7e12715e	267
1f83511b RW	268	if (state)
	269	pm_wakeup_event(&device->dev, 0);
	270
7e12715e JB	271	ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
	272	if (ret == NOTIFY_DONE)
	273	ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
	274	device);
13c199c0 ZY	275	if (ret == NOTIFY_DONE \|\| ret == NOTIFY_OK) {
	276	/*
	277	* It is also regarded as success if the notifier_chain
	278	* returns NOTIFY_OK or NOTIFY_DONE.
	279	*/
	280	ret = 0;
	281	}
7e12715e	282	return ret;
23de5d9e	283	}
1da177e4	284
373cfc36	285	static void acpi_button_notify(struct acpi_device *device, u32 event)
1da177e4	286	{
373cfc36	287	struct acpi_button *button = acpi_driver_data(device);
c0968f0e	288	struct input_dev *input;
1da177e4	289
1da177e4	290	switch (event) {
373cfc36 BH	291	case ACPI_FIXED_HARDWARE_EVENT:
	292	event = ACPI_BUTTON_NOTIFY_STATUS;
	293	/* fall through */
1da177e4	294	case ACPI_BUTTON_NOTIFY_STATUS:
c0968f0e	295	input = button->input;
c0968f0e	296	if (button->type == ACPI_BUTTON_TYPE_LID) {
106c19e7	297	acpi_lid_send_state(device);
c0968f0e	298	} else {
e71eeb2a RW	299	int keycode;
	300
	301	pm_wakeup_event(&device->dev, 0);
	302	if (button->suspended)
	303	break;
c0968f0e	304
e71eeb2a RW	305	keycode = test_bit(KEY_SLEEP, input->keybit) ?
e71eeb2a RW	306	KEY_SLEEP : KEY_POWER;
c0968f0e DT	307	input_report_key(input, keycode, 1);
	308	input_sync(input);
	309	input_report_key(input, keycode, 0);
df316e93	310	input_sync(input);
1f83511b	311
0bf6368e LT	312	acpi_bus_generate_netlink_event(
	313	device->pnp.device_class,
	314	dev_name(&device->dev),
	315	event, ++button->pushed);
c0968f0e	316	}
1da177e4 LT	317	break;
	318	default:
	319	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
4be44fcd	320	"Unsupported event [0x%x]\n", event));
1da177e4 LT	321	break;
1da177e4 LT	322	}
1da177e4 LT	323	}
1da177e4 LT	324
90692404	325	#ifdef CONFIG_PM_SLEEP
e71eeb2a RW	326	static int acpi_button_suspend(struct device *dev)
	327	{
	328	struct acpi_device *device = to_acpi_device(dev);
	329	struct acpi_button *button = acpi_driver_data(device);
	330
	331	button->suspended = true;
	332	return 0;
	333	}
	334
1be532de	335	static int acpi_button_resume(struct device *dev)
23de5d9e	336	{
1be532de	337	struct acpi_device *device = to_acpi_device(dev);
1bce8113	338	struct acpi_button *button = acpi_driver_data(device);
50a4da89	339
e71eeb2a	340	button->suspended = false;
e2fb9754	341	if (button->type == ACPI_BUTTON_TYPE_LID)
106c19e7	342	return acpi_lid_send_state(device);
23de5d9e AS	343	return 0;
23de5d9e AS	344	}
90692404	345	#endif
23de5d9e	346
c0968f0e DT	347	static int acpi_button_add(struct acpi_device *device)
c0968f0e DT	348	{
c0968f0e DT	349	struct acpi_button *button;
c0968f0e DT	350	struct input_dev *input;
620e112c TR	351	const char *hid = acpi_device_hid(device);
620e112c TR	352	char name, class;
1bce8113	353	int error;
1da177e4	354
c0968f0e	355	button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
1da177e4	356	if (!button)
d550d98d	357	return -ENOMEM;
1da177e4	358
db89b4f0	359	device->driver_data = button;
1da177e4	360
c0968f0e DT	361	button->input = input = input_allocate_device();
	362	if (!input) {
	363	error = -ENOMEM;
	364	goto err_free_button;
	365	}
	366
bf04a772 BH	367	name = acpi_device_name(device);
	368	class = acpi_device_class(device);
	369
d68b597c BH	370	if (!strcmp(hid, ACPI_BUTTON_HID_POWER) \|\|
d68b597c BH	371	!strcmp(hid, ACPI_BUTTON_HID_POWERF)) {
1da177e4	372	button->type = ACPI_BUTTON_TYPE_POWER;
bf04a772 BH	373	strcpy(name, ACPI_BUTTON_DEVICE_NAME_POWER);
bf04a772 BH	374	sprintf(class, "%s/%s",
1da177e4	375	ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_POWER);
d68b597c BH	376	} else if (!strcmp(hid, ACPI_BUTTON_HID_SLEEP) \|\|
d68b597c BH	377	!strcmp(hid, ACPI_BUTTON_HID_SLEEPF)) {
1da177e4	378	button->type = ACPI_BUTTON_TYPE_SLEEP;
bf04a772 BH	379	strcpy(name, ACPI_BUTTON_DEVICE_NAME_SLEEP);
bf04a772 BH	380	sprintf(class, "%s/%s",
1da177e4	381	ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_SLEEP);
bf04a772	382	} else if (!strcmp(hid, ACPI_BUTTON_HID_LID)) {
1da177e4	383	button->type = ACPI_BUTTON_TYPE_LID;
bf04a772 BH	384	strcpy(name, ACPI_BUTTON_DEVICE_NAME_LID);
bf04a772 BH	385	sprintf(class, "%s/%s",
1da177e4	386	ACPI_BUTTON_CLASS, ACPI_BUTTON_SUBCLASS_LID);
4be44fcd	387	} else {
bf04a772	388	printk(KERN_ERR PREFIX "Unsupported hid [%s]\n", hid);
c0968f0e DT	389	error = -ENODEV;
c0968f0e DT	390	goto err_free_input;
1da177e4 LT	391	}
1da177e4 LT	392
c0968f0e DT	393	error = acpi_button_add_fs(device);
	394	if (error)
	395	goto err_free_input;
	396
bf04a772	397	snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
c0968f0e	398
bf04a772	399	input->name = name;
c0968f0e DT	400	input->phys = button->phys;
	401	input->id.bustype = BUS_HOST;
	402	input->id.product = button->type;
3b34e523	403	input->dev.parent = &device->dev;
b34a8030	404
1da177e4	405	switch (button->type) {
c0968f0e	406	case ACPI_BUTTON_TYPE_POWER:
763f527b	407	input_set_capability(input, EV_KEY, KEY_POWER);
1da177e4	408	break;
c0968f0e DT	409
c0968f0e DT	410	case ACPI_BUTTON_TYPE_SLEEP:
763f527b	411	input_set_capability(input, EV_KEY, KEY_SLEEP);
1da177e4	412	break;
c0968f0e DT	413
c0968f0e DT	414	case ACPI_BUTTON_TYPE_LID:
763f527b	415	input_set_capability(input, EV_SW, SW_LID);
1da177e4 LT	416	break;
	417	}
	418
c0968f0e DT	419	error = input_register_device(input);
c0968f0e DT	420	if (error)
373cfc36	421	goto err_remove_fs;
7e12715e	422	if (button->type == ACPI_BUTTON_TYPE_LID) {
106c19e7	423	acpi_lid_send_state(device);
7e12715e JB	424	/*
	425	* This assumes there's only one lid device, or if there are
	426	* more we only care about the last one...
	427	*/
	428	lid_device = device;
	429	}
1da177e4	430
bf04a772	431	printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
c0968f0e	432	return 0;
1da177e4	433
c0968f0e DT	434	err_remove_fs:
	435	acpi_button_remove_fs(device);
	436	err_free_input:
	437	input_free_device(input);
	438	err_free_button:
	439	kfree(button);
	440	return error;
1da177e4 LT	441	}
1da177e4 LT	442
51fac838	443	static int acpi_button_remove(struct acpi_device *device)
1da177e4	444	{
1bce8113	445	struct acpi_button *button = acpi_driver_data(device);
1da177e4	446
4be44fcd	447	acpi_button_remove_fs(device);
c0968f0e	448	input_unregister_device(button->input);
1da177e4	449	kfree(button);
d550d98d	450	return 0;
1da177e4 LT	451	}
1da177e4 LT	452
466e78f7	453	module_acpi_driver(acpi_button_driver);