// SPDX-License-Identifier: GPL-2.0-only /* * power/home/volume button support for * Microsoft Surface Pro 3/4 tablet. * * Copyright (c) 2015 Intel Corporation. * All rights reserved. */ #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_PRO3_BUTTON_HID … #define SURFACE_PRO4_BUTTON_HID … #define SURFACE_BUTTON_OBJ_NAME … #define SURFACE_BUTTON_DEVICE_NAME … #define MSHW0040_DSM_REVISION … #define MSHW0040_DSM_GET_OMPR … static const guid_t MSHW0040_DSM_UUID = …; #define SURFACE_BUTTON_NOTIFY_TABLET_MODE … #define SURFACE_BUTTON_NOTIFY_PRESS_POWER … #define SURFACE_BUTTON_NOTIFY_RELEASE_POWER … #define SURFACE_BUTTON_NOTIFY_PRESS_HOME … #define SURFACE_BUTTON_NOTIFY_RELEASE_HOME … #define SURFACE_BUTTON_NOTIFY_PRESS_VOLUME_UP … #define SURFACE_BUTTON_NOTIFY_RELEASE_VOLUME_UP … #define SURFACE_BUTTON_NOTIFY_PRESS_VOLUME_DOWN … #define SURFACE_BUTTON_NOTIFY_RELEASE_VOLUME_DOWN … MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; /* * 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[] = …; MODULE_DEVICE_TABLE(acpi, surface_button_device_ids); struct surface_button { … }; static void surface_button_notify(struct acpi_device *device, u32 event) { … } #ifdef CONFIG_PM_SLEEP static int surface_button_suspend(struct device *dev) { … } static int surface_button_resume(struct device *dev) { … } #endif /* * Surface Pro 4 and Surface Book 2 / Surface Pro 2017 use the same device * ID (MSHW0040) for the power/volume buttons. Make sure this is the right * device by checking for the _DSM method and OEM Platform Revision. * * Returns true if the driver should bind to this device, i.e. the device is * either MSWH0028 (Pro 3) or MSHW0040 on a Pro 4 or Book 1. */ static bool surface_button_check_MSHW0040(struct acpi_device *dev) { … } static int surface_button_add(struct acpi_device *device) { … } static void surface_button_remove(struct acpi_device *device) { … } static SIMPLE_DEV_PM_OPS(surface_button_pm, surface_button_suspend, surface_button_resume); static struct acpi_driver surface_button_driver = …; module_acpi_driver(…) …;
Codebase Browser
linux