223 lines
6 KiB
C
223 lines
6 KiB
C
/*
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* power/home/volume button support for
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* Microsoft Surface Pro 3/4 tablet.
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*
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* Copyright (c) 2015 Intel Corporation.
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; version 2
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* of the License.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/input.h>
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#include <linux/acpi.h>
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#include <acpi/button.h>
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#define SURFACE_PRO3_BUTTON_HID "MSHW0028"
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#define SURFACE_PRO4_BUTTON_HID "MSHW0040"
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#define SURFACE_BUTTON_OBJ_NAME "VGBI"
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#define SURFACE_BUTTON_DEVICE_NAME "Surface Pro 3/4 Buttons"
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#define SURFACE_BUTTON_NOTIFY_TABLET_MODE 0xc8
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#define SURFACE_BUTTON_NOTIFY_PRESS_POWER 0xc6
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#define SURFACE_BUTTON_NOTIFY_RELEASE_POWER 0xc7
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#define SURFACE_BUTTON_NOTIFY_PRESS_HOME 0xc4
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#define SURFACE_BUTTON_NOTIFY_RELEASE_HOME 0xc5
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#define SURFACE_BUTTON_NOTIFY_PRESS_VOLUME_UP 0xc0
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#define SURFACE_BUTTON_NOTIFY_RELEASE_VOLUME_UP 0xc1
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#define SURFACE_BUTTON_NOTIFY_PRESS_VOLUME_DOWN 0xc2
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#define SURFACE_BUTTON_NOTIFY_RELEASE_VOLUME_DOWN 0xc3
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ACPI_MODULE_NAME("surface pro 3 button");
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MODULE_AUTHOR("Chen Yu");
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MODULE_DESCRIPTION("Surface Pro3 Button Driver");
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MODULE_LICENSE("GPL v2");
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/*
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* Power button, Home button, Volume buttons support is supposed to
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* be covered by drivers/input/misc/soc_button_array.c, which is implemented
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* according to "Windows ACPI Design Guide for SoC Platforms".
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* However surface pro3 seems not to obey the specs, instead it uses
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* device VGBI(MSHW0028) for dispatching the events.
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* We choose acpi_driver rather than platform_driver/i2c_driver because
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* although VGBI has an i2c resource connected to i2c controller, it
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* is not embedded in any i2c controller's scope, thus neither platform_device
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* will be created, nor i2c_client will be enumerated, we have to use
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* acpi_driver.
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*/
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static const struct acpi_device_id surface_button_device_ids[] = {
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{SURFACE_PRO3_BUTTON_HID, 0},
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{SURFACE_PRO4_BUTTON_HID, 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, surface_button_device_ids);
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struct surface_button {
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unsigned int type;
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struct input_dev *input;
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char phys[32]; /* for input device */
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unsigned long pushed;
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bool suspended;
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};
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static void surface_button_notify(struct acpi_device *device, u32 event)
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{
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struct surface_button *button = acpi_driver_data(device);
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struct input_dev *input;
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int key_code = KEY_RESERVED;
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bool pressed = false;
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switch (event) {
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/* Power button press,release handle */
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case SURFACE_BUTTON_NOTIFY_PRESS_POWER:
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pressed = true;
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/*fall through*/
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case SURFACE_BUTTON_NOTIFY_RELEASE_POWER:
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key_code = KEY_POWER;
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break;
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/* Home button press,release handle */
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case SURFACE_BUTTON_NOTIFY_PRESS_HOME:
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pressed = true;
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/*fall through*/
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case SURFACE_BUTTON_NOTIFY_RELEASE_HOME:
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key_code = KEY_LEFTMETA;
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break;
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/* Volume up button press,release handle */
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case SURFACE_BUTTON_NOTIFY_PRESS_VOLUME_UP:
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pressed = true;
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/*fall through*/
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case SURFACE_BUTTON_NOTIFY_RELEASE_VOLUME_UP:
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key_code = KEY_VOLUMEUP;
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break;
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/* Volume down button press,release handle */
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case SURFACE_BUTTON_NOTIFY_PRESS_VOLUME_DOWN:
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pressed = true;
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/*fall through*/
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case SURFACE_BUTTON_NOTIFY_RELEASE_VOLUME_DOWN:
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key_code = KEY_VOLUMEDOWN;
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break;
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case SURFACE_BUTTON_NOTIFY_TABLET_MODE:
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dev_warn_once(&device->dev, "Tablet mode is not supported\n");
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break;
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default:
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dev_info_ratelimited(&device->dev,
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"Unsupported event [0x%x]\n", event);
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break;
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}
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input = button->input;
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if (key_code == KEY_RESERVED)
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return;
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if (pressed)
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pm_wakeup_event(&device->dev, 0);
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if (button->suspended)
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return;
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input_report_key(input, key_code, pressed?1:0);
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input_sync(input);
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}
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#ifdef CONFIG_PM_SLEEP
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static int surface_button_suspend(struct device *dev)
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{
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struct acpi_device *device = to_acpi_device(dev);
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struct surface_button *button = acpi_driver_data(device);
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button->suspended = true;
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return 0;
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}
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static int surface_button_resume(struct device *dev)
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{
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struct acpi_device *device = to_acpi_device(dev);
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struct surface_button *button = acpi_driver_data(device);
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button->suspended = false;
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return 0;
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}
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#endif
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static int surface_button_add(struct acpi_device *device)
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{
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struct surface_button *button;
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struct input_dev *input;
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const char *hid = acpi_device_hid(device);
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char *name;
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int error;
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if (strncmp(acpi_device_bid(device), SURFACE_BUTTON_OBJ_NAME,
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strlen(SURFACE_BUTTON_OBJ_NAME)))
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return -ENODEV;
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button = kzalloc(sizeof(struct surface_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();
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if (!input) {
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error = -ENOMEM;
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goto err_free_button;
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}
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name = acpi_device_name(device);
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strcpy(name, SURFACE_BUTTON_DEVICE_NAME);
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snprintf(button->phys, sizeof(button->phys), "%s/buttons", hid);
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input->name = name;
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input->phys = button->phys;
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input->id.bustype = BUS_HOST;
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input->dev.parent = &device->dev;
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input_set_capability(input, EV_KEY, KEY_POWER);
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input_set_capability(input, EV_KEY, KEY_LEFTMETA);
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input_set_capability(input, EV_KEY, KEY_VOLUMEUP);
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input_set_capability(input, EV_KEY, KEY_VOLUMEDOWN);
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error = input_register_device(input);
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if (error)
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goto err_free_input;
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dev_info(&device->dev,
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"%s [%s]\n", name, acpi_device_bid(device));
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return 0;
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err_free_input:
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input_free_device(input);
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err_free_button:
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kfree(button);
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return error;
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}
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static int surface_button_remove(struct acpi_device *device)
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{
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struct surface_button *button = acpi_driver_data(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 SIMPLE_DEV_PM_OPS(surface_button_pm,
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surface_button_suspend, surface_button_resume);
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static struct acpi_driver surface_button_driver = {
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.name = "surface_pro3_button",
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.class = "SurfacePro3",
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.ids = surface_button_device_ids,
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.ops = {
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.add = surface_button_add,
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.remove = surface_button_remove,
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.notify = surface_button_notify,
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},
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.drv.pm = &surface_button_pm,
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};
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module_acpi_driver(surface_button_driver);
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