button.c 13.2 KB
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/*
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 *  button.c - ACPI Button Driver
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 *
 *  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>
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#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
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#include <linux/input.h>
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#include <linux/slab.h>
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#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

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#define PREFIX "ACPI: "

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#define ACPI_BUTTON_CLASS		"button"
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#define ACPI_BUTTON_FILE_INFO		"info"
#define ACPI_BUTTON_FILE_STATE		"state"
#define ACPI_BUTTON_TYPE_UNKNOWN	0x00
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#define ACPI_BUTTON_NOTIFY_STATUS	0x80

#define ACPI_BUTTON_SUBCLASS_POWER	"power"
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#define ACPI_BUTTON_HID_POWER		"PNP0C0C"
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#define ACPI_BUTTON_DEVICE_NAME_POWER	"Power Button"
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#define ACPI_BUTTON_TYPE_POWER		0x01

#define ACPI_BUTTON_SUBCLASS_SLEEP	"sleep"
#define ACPI_BUTTON_HID_SLEEP		"PNP0C0E"
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#define ACPI_BUTTON_DEVICE_NAME_SLEEP	"Sleep Button"
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#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
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ACPI_MODULE_NAME("button");
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MODULE_AUTHOR("Paul Diefenbaugh");
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MODULE_DESCRIPTION("ACPI Button Driver");
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MODULE_LICENSE("GPL");

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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);

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static int acpi_button_add(struct acpi_device *device);
static int acpi_button_remove(struct acpi_device *device, int type);
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static int acpi_button_resume(struct acpi_device *device);
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static void acpi_button_notify(struct acpi_device *device, u32 event);
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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);
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static struct acpi_driver acpi_button_driver = {
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	.name = "button",
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	.class = ACPI_BUTTON_CLASS,
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	.ids = button_device_ids,
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	.ops = {
		.add = acpi_button_add,
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		.resume = acpi_button_resume,
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		.remove = acpi_button_remove,
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		.notify = acpi_button_notify,
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	},
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};

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

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

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static const struct file_operations acpi_button_state_fops = {
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	.owner = THIS_MODULE,
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	.open = acpi_button_state_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
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};
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static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);
static struct acpi_device *lid_device;

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

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static struct proc_dir_entry *acpi_button_dir;
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static int acpi_button_info_seq_show(struct seq_file *seq, void *offset)
{
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	struct acpi_device *device = seq->private;
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	seq_printf(seq, "type:                    %s\n",
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		   acpi_device_name(device));
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	return 0;
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}

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);
}
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static int acpi_button_state_seq_show(struct seq_file *seq, void *offset)
{
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	struct acpi_device *device = seq->private;
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	acpi_status status;
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	unsigned long long state;
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	status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
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	seq_printf(seq, "state:      %s\n",
		   ACPI_FAILURE(status) ? "unsupported" :
			(state ? "open" : "closed"));
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	return 0;
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}

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;

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static int acpi_button_add_fs(struct acpi_device *device)
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{
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	struct acpi_button *button = acpi_driver_data(device);
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	struct proc_dir_entry *entry = NULL;
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	switch (button->type) {
	case ACPI_BUTTON_TYPE_POWER:
		if (!acpi_power_dir)
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			acpi_power_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_POWER,
						    acpi_button_dir);
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		entry = acpi_power_dir;
		break;
	case ACPI_BUTTON_TYPE_SLEEP:
		if (!acpi_sleep_dir)
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			acpi_sleep_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_SLEEP,
						    acpi_button_dir);
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		entry = acpi_sleep_dir;
		break;
	case ACPI_BUTTON_TYPE_LID:
		if (!acpi_lid_dir)
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			acpi_lid_dir = proc_mkdir(ACPI_BUTTON_SUBCLASS_LID,
						  acpi_button_dir);
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		entry = acpi_lid_dir;
		break;
	}

	if (!entry)
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		return -ENODEV;
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	acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device), entry);
	if (!acpi_device_dir(device))
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		return -ENODEV;
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	/* 'info' [R] */
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	entry = proc_create_data(ACPI_BUTTON_FILE_INFO,
				 S_IRUGO, acpi_device_dir(device),
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				 &acpi_button_info_fops, device);
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	if (!entry)
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		return -ENODEV;
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	/* show lid state [R] */
	if (button->type == ACPI_BUTTON_TYPE_LID) {
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		entry = proc_create_data(ACPI_BUTTON_FILE_STATE,
					 S_IRUGO, acpi_device_dir(device),
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					 &acpi_button_state_fops, device);
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		if (!entry)
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			return -ENODEV;
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	}

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	return 0;
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}

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static int acpi_button_remove_fs(struct acpi_device *device)
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{
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	struct acpi_button *button = acpi_driver_data(device);
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	if (acpi_device_dir(device)) {
		if (button->type == ACPI_BUTTON_TYPE_LID)
			remove_proc_entry(ACPI_BUTTON_FILE_STATE,
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					  acpi_device_dir(device));
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		remove_proc_entry(ACPI_BUTTON_FILE_INFO,
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				  acpi_device_dir(device));
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		remove_proc_entry(acpi_device_bid(device),
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				  acpi_device_dir(device)->parent);
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		acpi_device_dir(device) = NULL;
	}

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	return 0;
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}

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

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	if (!lid_device)
		return -ENODEV;

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

	return !!state;
}
EXPORT_SYMBOL(acpi_lid_open);

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static int acpi_lid_send_state(struct acpi_device *device)
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{
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	struct acpi_button *button = acpi_driver_data(device);
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	unsigned long long state;
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	acpi_status status;
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	int ret;
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	status = acpi_evaluate_integer(device->handle, "_LID", NULL, &state);
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	if (ACPI_FAILURE(status))
		return -ENODEV;
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	/* input layer checks if event is redundant */
	input_report_switch(button->input, SW_LID, !state);
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	input_sync(button->input);
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	ret = blocking_notifier_call_chain(&acpi_lid_notifier, state, device);
	if (ret == NOTIFY_DONE)
		ret = blocking_notifier_call_chain(&acpi_lid_notifier, state,
						   device);
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	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;
	}
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	return ret;
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}
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static void acpi_button_notify(struct acpi_device *device, u32 event)
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{
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	struct acpi_button *button = acpi_driver_data(device);
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	struct input_dev *input;
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	switch (event) {
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	case ACPI_FIXED_HARDWARE_EVENT:
		event = ACPI_BUTTON_NOTIFY_STATUS;
		/* fall through */
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	case ACPI_BUTTON_NOTIFY_STATUS:
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		input = button->input;
		if (button->type == ACPI_BUTTON_TYPE_LID) {
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			acpi_lid_send_state(device);
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		} 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);
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			input_sync(input);
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		}

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

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static int acpi_button_resume(struct acpi_device *device)
{
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	struct acpi_button *button = acpi_driver_data(device);
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	if (button->type == ACPI_BUTTON_TYPE_LID)
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		return acpi_lid_send_state(device);
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	return 0;
}

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static int acpi_button_add(struct acpi_device *device)
{
	struct acpi_button *button;
	struct input_dev *input;
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	char *hid, *name, *class;
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	int error;
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	button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);
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	if (!button)
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		return -ENOMEM;
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	device->driver_data = button;
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	button->input = input = input_allocate_device();
	if (!input) {
		error = -ENOMEM;
		goto err_free_button;
	}

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

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

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

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	snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
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	input->name = name;
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	input->phys = button->phys;
	input->id.bustype = BUS_HOST;
	input->id.product = button->type;
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	input->dev.parent = &device->dev;
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	switch (button->type) {
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	case ACPI_BUTTON_TYPE_POWER:
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		input->evbit[0] = BIT_MASK(EV_KEY);
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		set_bit(KEY_POWER, input->keybit);
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		break;
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	case ACPI_BUTTON_TYPE_SLEEP:
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		input->evbit[0] = BIT_MASK(EV_KEY);
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		set_bit(KEY_SLEEP, input->keybit);
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		break;
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	case ACPI_BUTTON_TYPE_LID:
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		input->evbit[0] = BIT_MASK(EV_SW);
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		set_bit(SW_LID, input->swbit);
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		break;
	}

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	error = input_register_device(input);
	if (error)
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		goto err_remove_fs;
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	if (button->type == ACPI_BUTTON_TYPE_LID) {
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		acpi_lid_send_state(device);
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		/*
		 * This assumes there's only one lid device, or if there are
		 * more we only care about the last one...
		 */
		lid_device = device;
	}
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	if (device->wakeup.flags.valid) {
		/* Button's GPE is run-wake GPE */
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		acpi_enable_gpe(device->wakeup.gpe_device,
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				device->wakeup.gpe_number,
				ACPI_GPE_TYPE_WAKE_RUN);
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		device->wakeup.run_wake_count++;
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		device->wakeup.state.enabled = 1;
	}

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	printk(KERN_INFO PREFIX "%s [%s]\n", name, acpi_device_bid(device));
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	return 0;
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 err_remove_fs:
	acpi_button_remove_fs(device);
 err_free_input:
	input_free_device(input);
 err_free_button:
	kfree(button);
	return error;
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}

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static int acpi_button_remove(struct acpi_device *device, int type)
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{
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	struct acpi_button *button = acpi_driver_data(device);
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	if (device->wakeup.flags.valid) {
		acpi_disable_gpe(device->wakeup.gpe_device,
				device->wakeup.gpe_number,
				ACPI_GPE_TYPE_WAKE_RUN);
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		device->wakeup.run_wake_count--;
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		device->wakeup.state.enabled = 0;
	}

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

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static int __init acpi_button_init(void)
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{
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	int result;
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	acpi_button_dir = proc_mkdir(ACPI_BUTTON_CLASS, acpi_root_dir);
	if (!acpi_button_dir)
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		return -ENODEV;
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	result = acpi_bus_register_driver(&acpi_button_driver);
	if (result < 0) {
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		remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
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		return -ENODEV;
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	}

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	return 0;
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}

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static void __exit acpi_button_exit(void)
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{
	acpi_bus_unregister_driver(&acpi_button_driver);

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	if (acpi_power_dir)
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		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);
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}

module_init(acpi_button_init);
module_exit(acpi_button_exit);