Release 4.11 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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 */


#define pr_fmt(fmt) "ACPI : button: " fmt

#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 ACPI_BUTTON_LID_INIT_IGNORE	0x00

#define ACPI_BUTTON_LID_INIT_OPEN	0x01


#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;
	
int last_state;
	
ktime_t last_time;
	
bool suspended;
};

static BLOCKING_NOTIFIER_HEAD(acpi_lid_notifier);

static struct acpi_device *lid_device;

static u8 lid_init_state = ACPI_BUTTON_LID_INIT_OPEN;


static unsigned long lid_report_interval __read_mostly = 500;
module_param(lid_report_interval, ulong, 0644);
MODULE_PARM_DESC(lid_report_interval, "Interval (ms) between lid key events");

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


static struct proc_dir_entry *acpi_button_dir;

static struct proc_dir_entry *acpi_lid_dir;



static int acpi_lid_evaluate_state(struct acpi_device *device)
{
	unsigned long long lid_state;
	acpi_status status;

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

	return lid_state ? 1 : 0;
}

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static int acpi_lid_notify_state(struct acpi_device *device, int state)
{
	struct acpi_button *button = acpi_driver_data(device);
	int ret;
	ktime_t next_report;
	bool do_update;

	/*
         * In lid_init_state=ignore mode, if user opens/closes lid
         * frequently with "open" missing, and "last_time" is also updated
         * frequently, "close" cannot be delivered to the userspace.
         * So "last_time" is only updated after a timeout or an actual
         * switch.
         */
	if (lid_init_state != ACPI_BUTTON_LID_INIT_IGNORE ||
	    button->last_state != !!state)
		do_update = true;
	else
		do_update = false;

	next_report = ktime_add(button->last_time,
				ms_to_ktime(lid_report_interval));
	if (button->last_state == !!state &&
	    ktime_after(ktime_get(), next_report)) {
		/* Complain the buggy firmware */
		pr_warn_once("The lid device is not compliant to SW_LID.\n");

		/*
                 * Send the unreliable complement switch event:
                 *
                 * On most platforms, the lid device is reliable. However
                 * there are exceptions:
                 * 1. Platforms returning initial lid state as "close" by
                 *    default after booting/resuming:
                 *     https://bugzilla.kernel.org/show_bug.cgi?id=89211
                 *     https://bugzilla.kernel.org/show_bug.cgi?id=106151
                 * 2. Platforms never reporting "open" events:
                 *     https://bugzilla.kernel.org/show_bug.cgi?id=106941
                 * On these buggy platforms, the usage model of the ACPI
                 * lid device actually is:
                 * 1. The initial returning value of _LID may not be
                 *    reliable.
                 * 2. The open event may not be reliable.
                 * 3. The close event is reliable.
                 *
                 * But SW_LID is typed as input switch event, the input
                 * layer checks if the event is redundant. Hence if the
                 * state is not switched, the userspace cannot see this
                 * platform triggered reliable event. By inserting a
                 * complement switch event, it then is guaranteed that the
                 * platform triggered reliable one can always be seen by
                 * the userspace.
                 */
		if (lid_init_state == ACPI_BUTTON_LID_INIT_IGNORE) {
			do_update = true;
			/*
                         * Do generate complement switch event for "close"
                         * as "close" is reliable and wrong "open" won't
                         * trigger unexpected behaviors.
                         * Do not generate complement switch event for
                         * "open" as "open" is not reliable and wrong
                         * "close" will trigger unexpected behaviors.
                         */
			if (!state) {
				input_report_switch(button->input,
						    SW_LID, state);
				input_sync(button->input);
			}
		}
	}
	/* Send the platform triggered reliable event */
	if (do_update) {
		input_report_switch(button->input, SW_LID, !state);
		input_sync(button->input);
		button->last_state = !!state;
		button->last_time = ktime_get();
	}

	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;
}

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

	state = acpi_lid_evaluate_state(device);
	seq_printf(seq, "state:      %s\n",
		   state < 0 ? "unsupported" : (state ? "open" : "closed"));
	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_DATA(inode));
}

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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);
	acpi_lid_dir = NULL;
remove_button_dir:
	remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
	acpi_button_dir = NULL;
	goto done;
}

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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);
	acpi_lid_dir = NULL;
	remove_proc_entry(ACPI_BUTTON_CLASS, acpi_root_dir);
	acpi_button_dir = NULL;

	return 0;
}

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


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



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



int acpi_lid_open(void)
{
	if (!lid_device)
		return -ENODEV;

	return acpi_lid_evaluate_state(lid_device);
}
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EXPORT_SYMBOL(acpi_lid_open);



static int acpi_lid_update_state(struct acpi_device *device)
{
	int state;

	state = acpi_lid_evaluate_state(device);
	if (state < 0)
		return state;

	return acpi_lid_notify_state(device, state);
}

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static void acpi_lid_initialize_state(struct acpi_device *device)
{
	switch (lid_init_state) {
	case ACPI_BUTTON_LID_INIT_OPEN:
		(void)acpi_lid_notify_state(device, 1);
		break;
	case ACPI_BUTTON_LID_INIT_IGNORE:
	default:
		break;
	}
}

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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_update_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;
	}
}

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#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;
}

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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)
		acpi_lid_initialize_state(device);
	return 0;
}
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#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);
		button->last_state = !!acpi_lid_evaluate_state(device);
		button->last_time = ktime_get();
	} 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_initialize_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;
}

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1
5.00%
Patrick Mochel
2
0.43%
1
5.00%
Total
463
100.00%
20
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Andy Grover
28
68.29%
2
28.57%
Dmitry Torokhov
5
12.20%
1
14.29%
Alexey Y. Starikovskiy
3
7.32%
1
14.29%
Patrick Mochel
3
7.32%
2
28.57%
Björn Helgaas
2
4.88%
1
14.29%
Total
41
100.00%
7
100.00%



static int param_set_lid_init_state(const char *val, struct kernel_param *kp)
{
	int result = 0;

	if (!strncmp(val, "open", sizeof("open") - 1)) {
		lid_init_state = ACPI_BUTTON_LID_INIT_OPEN;
		pr_info("Notify initial lid state as open\n");
	} else if (!strncmp(val, "ignore", sizeof("ignore") - 1)) {
		lid_init_state = ACPI_BUTTON_LID_INIT_IGNORE;
		pr_info("Do not notify initial lid state\n");
	} else
		result = -EINVAL;
	return result;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Lv Zheng
87
100.00%
1
100.00%
Total
87
100.00%
1
100.00%



static int param_get_lid_init_state(char *buffer, struct kernel_param *kp)
{
	switch (lid_init_state) {
	case ACPI_BUTTON_LID_INIT_OPEN:
		return sprintf(buffer, "open");
	case ACPI_BUTTON_LID_INIT_IGNORE:
		return sprintf(buffer, "ignore");
	default:
		return sprintf(buffer, "invalid");
	}
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Lv Zheng
55
100.00%
1
100.00%
Total
55
100.00%
1
100.00%

module_param_call(lid_init_state,
		  param_set_lid_init_state, param_get_lid_init_state,
		  NULL, 0644);
MODULE_PARM_DESC(lid_init_state, "Behavior for reporting LID initial state");


module_acpi_driver(acpi_button_driver);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Lv Zheng
599
26.89%
5
9.80%
Alexey Y. Starikovskiy
406
18.22%
3
5.88%
Dmitry Torokhov
260
11.67%
1
1.96%
Andy Grover
249
11.18%
4
7.84%
Rui Zhang
150
6.73%
1
1.96%
Rafael J. Wysocki
133
5.97%
3
5.88%
Jesse Barnes
99
4.44%
2
3.92%
Björn Helgaas
94
4.22%
5
9.80%
Patrick Mochel
65
2.92%
3
5.88%
Thomas Renninger
63
2.83%
3
5.88%
Lan Tianyu
36
1.62%
2
3.92%
Benjamin Tissoires
16
0.72%
1
1.96%
Len Brown
16
0.72%
7
13.73%
Andrey Borzenkov
11
0.49%
1
1.96%
Denis V. Lunev
9
0.40%
1
1.96%
Shuah Khan
6
0.27%
1
1.96%
Andrew Morton
3
0.13%
1
1.96%
Tejun Heo
3
0.13%
1
1.96%
Andy Shevchenko
3
0.13%
1
1.96%
Mika Westerberg
2
0.09%
1
1.96%
Pavel Machek
2
0.09%
1
1.96%
Jarkko Nikula
1
0.04%
1
1.96%
Al Viro
1
0.04%
1
1.96%
Guillem Jover
1
0.04%
1
1.96%
Total
2228
100.00%
51
100.00%
Directory: drivers/acpi

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