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/*
* power/home/volume button support for
* Microsoft Surface Pro 3 tablet.
*
* Copyright (c) 2015 Intel Corporation.
* All rights reserved.
*
* 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; version 2
* of the License.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/input.h>
#include <linux/acpi.h>
#include <acpi/button.h>
#define SURFACE_BUTTON_HID "MSHW0028"
#define SURFACE_BUTTON_OBJ_NAME "VGBI"
#define SURFACE_BUTTON_DEVICE_NAME "Surface Pro 3 Buttons"
#define SURFACE_BUTTON_NOTIFY_PRESS_POWER 0xc6
#define SURFACE_BUTTON_NOTIFY_RELEASE_POWER 0xc7
#define SURFACE_BUTTON_NOTIFY_PRESS_HOME 0xc4
#define SURFACE_BUTTON_NOTIFY_RELEASE_HOME 0xc5
#define SURFACE_BUTTON_NOTIFY_PRESS_VOLUME_UP 0xc0
#define SURFACE_BUTTON_NOTIFY_RELEASE_VOLUME_UP 0xc1
#define SURFACE_BUTTON_NOTIFY_PRESS_VOLUME_DOWN 0xc2
#define SURFACE_BUTTON_NOTIFY_RELEASE_VOLUME_DOWN 0xc3
ACPI_MODULE_NAME("surface pro 3 button");
MODULE_AUTHOR("Chen Yu");
MODULE_DESCRIPTION("Surface Pro3 Button Driver");
MODULE_LICENSE("GPL v2");
/*
* Power button, Home button, Volume buttons support is supposed to
* be covered by drivers/input/misc/soc_button_array.c, which is implemented
* according to "Windows ACPI Design Guide for SoC Platforms".
* However surface pro3 seems not to obey the specs, instead it uses
* device VGBI(MSHW0028) for dispatching the events.
* We choose acpi_driver rather than platform_driver/i2c_driver because
* although VGBI has an i2c resource connected to i2c controller, it
* is not embedded in any i2c controller's scope, thus neither platform_device
* will be created, nor i2c_client will be enumerated, we have to use
* acpi_driver.
*/
static const struct acpi_device_id surface_button_device_ids[] = {
{SURFACE_BUTTON_HID, 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, surface_button_device_ids);
struct surface_button {
unsigned int type;
struct input_dev *input;
char phys[32]; /* for input device */
unsigned long pushed;
bool suspended;
};
static void surface_button_notify(struct acpi_device *device, u32 event)
{
struct surface_button *button = acpi_driver_data(device);
struct input_dev *input;
int key_code = KEY_RESERVED;
bool pressed = false;
switch (event) {
/* Power button press,release handle */
case SURFACE_BUTTON_NOTIFY_PRESS_POWER:
pressed = true;
/*fall through*/
case SURFACE_BUTTON_NOTIFY_RELEASE_POWER:
key_code = KEY_POWER;
break;
/* Home button press,release handle */
case SURFACE_BUTTON_NOTIFY_PRESS_HOME:
pressed = true;
/*fall through*/
case SURFACE_BUTTON_NOTIFY_RELEASE_HOME:
key_code = KEY_LEFTMETA;
break;
/* Volume up button press,release handle */
case SURFACE_BUTTON_NOTIFY_PRESS_VOLUME_UP:
pressed = true;
/*fall through*/
case SURFACE_BUTTON_NOTIFY_RELEASE_VOLUME_UP:
key_code = KEY_VOLUMEUP;
break;
/* Volume down button press,release handle */
case SURFACE_BUTTON_NOTIFY_PRESS_VOLUME_DOWN:
pressed = true;
/*fall through*/
case SURFACE_BUTTON_NOTIFY_RELEASE_VOLUME_DOWN:
key_code = KEY_VOLUMEDOWN;
break;
default:
dev_info_ratelimited(&device->dev,
"Unsupported event [0x%x]\n", event);
break;
}
input = button->input;
if (KEY_RESERVED == key_code)
return;
if (pressed)
pm_wakeup_event(&device->dev, 0);
if (button->suspended)
return;
input_report_key(input, key_code, pressed?1:0);
input_sync(input);
}
#ifdef CONFIG_PM_SLEEP
static int surface_button_suspend(struct device *dev)
{
struct acpi_device *device = to_acpi_device(dev);
struct surface_button *button = acpi_driver_data(device);
button->suspended = true;
return 0;
}
static int surface_button_resume(struct device *dev)
{
struct acpi_device *device = to_acpi_device(dev);
struct surface_button *button = acpi_driver_data(device);
button->suspended = false;
return 0;
}
#endif
static int surface_button_add(struct acpi_device *device)
{
struct surface_button *button;
struct input_dev *input;
const char *hid = acpi_device_hid(device);
char *name;
int error;
if (strncmp(acpi_device_bid(device), SURFACE_BUTTON_OBJ_NAME,
strlen(SURFACE_BUTTON_OBJ_NAME)))
return -ENODEV;
button = kzalloc(sizeof(struct surface_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);
strcpy(name, SURFACE_BUTTON_DEVICE_NAME);
snprintf(button->phys, sizeof(button->phys), "%s/buttons", hid);
input->name = name;
input->phys = button->phys;
input->id.bustype = BUS_HOST;
input->dev.parent = &device->dev;
input_set_capability(input, EV_KEY, KEY_POWER);
input_set_capability(input, EV_KEY, KEY_LEFTMETA);
input_set_capability(input, EV_KEY, KEY_VOLUMEUP);
input_set_capability(input, EV_KEY, KEY_VOLUMEDOWN);
error = input_register_device(input);
if (error)
goto err_free_input;
dev_info(&device->dev,
"%s [%s]\n", name, acpi_device_bid(device));
return 0;
err_free_input:
input_free_device(input);
err_free_button:
kfree(button);
return error;
}
static int surface_button_remove(struct acpi_device *device)
{
struct surface_button *button = acpi_driver_data(device);
input_unregister_device(button->input);
kfree(button);
return 0;
}
static SIMPLE_DEV_PM_OPS(surface_button_pm,
surface_button_suspend, surface_button_resume);
static struct acpi_driver surface_button_driver = {
.name = "surface_pro3_button",
.class = "SurfacePro3",
.ids = surface_button_device_ids,
.ops = {
.add = surface_button_add,
.remove = surface_button_remove,
.notify = surface_button_notify,
},
.drv.pm = &surface_button_pm,
};
module_acpi_driver(surface_button_driver);
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