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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Surface GPE/Lid driver to enable wakeup from suspend via the lid by
* properly configuring the respective GPEs. Required for wakeup via lid on
* newer Intel-based Microsoft Surface devices.
*
* Copyright (C) 2020 Maximilian Luz <luzmaximilian@gmail.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
/*
* Note: The GPE numbers for the lid devices found below have been obtained
* from ACPI/the DSDT table, specifically from the GPE handler for the
* lid.
*/
static const struct property_entry lid_device_props_l17[] = {
PROPERTY_ENTRY_U32("gpe", 0x17),
{},
};
static const struct property_entry lid_device_props_l4D[] = {
PROPERTY_ENTRY_U32("gpe", 0x4D),
{},
};
static const struct property_entry lid_device_props_l4F[] = {
PROPERTY_ENTRY_U32("gpe", 0x4F),
{},
};
static const struct property_entry lid_device_props_l57[] = {
PROPERTY_ENTRY_U32("gpe", 0x57),
{},
};
/*
* Note: When changing this, don't forget to check that the MODULE_ALIAS below
* still fits.
*/
static const struct dmi_system_id dmi_lid_device_table[] = {
{
.ident = "Surface Pro 4",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 4"),
},
.driver_data = (void *)lid_device_props_l17,
},
{
.ident = "Surface Pro 5",
.matches = {
/*
* We match for SKU here due to generic product name
* "Surface Pro".
*/
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Pro_1796"),
},
.driver_data = (void *)lid_device_props_l4F,
},
{
.ident = "Surface Pro 5 (LTE)",
.matches = {
/*
* We match for SKU here due to generic product name
* "Surface Pro"
*/
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Pro_1807"),
},
.driver_data = (void *)lid_device_props_l4F,
},
{
.ident = "Surface Pro 6",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 6"),
},
.driver_data = (void *)lid_device_props_l4F,
},
{
.ident = "Surface Pro 7",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 7"),
},
.driver_data = (void *)lid_device_props_l4D,
},
{
.ident = "Surface Book 1",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book"),
},
.driver_data = (void *)lid_device_props_l17,
},
{
.ident = "Surface Book 2",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book 2"),
},
.driver_data = (void *)lid_device_props_l17,
},
{
.ident = "Surface Book 3",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book 3"),
},
.driver_data = (void *)lid_device_props_l4D,
},
{
.ident = "Surface Laptop 1",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Laptop"),
},
.driver_data = (void *)lid_device_props_l57,
},
{
.ident = "Surface Laptop 2",
.matches = {
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Laptop 2"),
},
.driver_data = (void *)lid_device_props_l57,
},
{
.ident = "Surface Laptop 3 (Intel 13\")",
.matches = {
/*
* We match for SKU here due to different variants: The
* AMD (15") version does not rely on GPEs.
*/
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Laptop_3_1867:1868"),
},
.driver_data = (void *)lid_device_props_l4D,
},
{
.ident = "Surface Laptop 3 (Intel 15\")",
.matches = {
/*
* We match for SKU here due to different variants: The
* AMD (15") version does not rely on GPEs.
*/
DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Laptop_3_1872"),
},
.driver_data = (void *)lid_device_props_l4D,
},
{ }
};
struct surface_lid_device {
u32 gpe_number;
};
static int surface_lid_enable_wakeup(struct device *dev, bool enable)
{
const struct surface_lid_device *lid = dev_get_drvdata(dev);
int action = enable ? ACPI_GPE_ENABLE : ACPI_GPE_DISABLE;
acpi_status status;
status = acpi_set_gpe_wake_mask(NULL, lid->gpe_number, action);
if (ACPI_FAILURE(status)) {
dev_err(dev, "failed to set GPE wake mask: %s\n",
acpi_format_exception(status));
return -EINVAL;
}
return 0;
}
static int surface_gpe_suspend(struct device *dev)
{
return surface_lid_enable_wakeup(dev, true);
}
static int surface_gpe_resume(struct device *dev)
{
return surface_lid_enable_wakeup(dev, false);
}
static SIMPLE_DEV_PM_OPS(surface_gpe_pm, surface_gpe_suspend, surface_gpe_resume);
static int surface_gpe_probe(struct platform_device *pdev)
{
struct surface_lid_device *lid;
u32 gpe_number;
acpi_status status;
int ret;
ret = device_property_read_u32(&pdev->dev, "gpe", &gpe_number);
if (ret) {
dev_err(&pdev->dev, "failed to read 'gpe' property: %d\n", ret);
return ret;
}
lid = devm_kzalloc(&pdev->dev, sizeof(*lid), GFP_KERNEL);
if (!lid)
return -ENOMEM;
lid->gpe_number = gpe_number;
platform_set_drvdata(pdev, lid);
status = acpi_mark_gpe_for_wake(NULL, gpe_number);
if (ACPI_FAILURE(status)) {
dev_err(&pdev->dev, "failed to mark GPE for wake: %s\n",
acpi_format_exception(status));
return -EINVAL;
}
status = acpi_enable_gpe(NULL, gpe_number);
if (ACPI_FAILURE(status)) {
dev_err(&pdev->dev, "failed to enable GPE: %s\n",
acpi_format_exception(status));
return -EINVAL;
}
ret = surface_lid_enable_wakeup(&pdev->dev, false);
if (ret)
acpi_disable_gpe(NULL, gpe_number);
return ret;
}
static int surface_gpe_remove(struct platform_device *pdev)
{
struct surface_lid_device *lid = dev_get_drvdata(&pdev->dev);
/* restore default behavior without this module */
surface_lid_enable_wakeup(&pdev->dev, false);
acpi_disable_gpe(NULL, lid->gpe_number);
return 0;
}
static struct platform_driver surface_gpe_driver = {
.probe = surface_gpe_probe,
.remove = surface_gpe_remove,
.driver = {
.name = "surface_gpe",
.pm = &surface_gpe_pm,
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
};
static struct platform_device *surface_gpe_device;
static int __init surface_gpe_init(void)
{
const struct dmi_system_id *match;
struct platform_device *pdev;
struct fwnode_handle *fwnode;
int status;
match = dmi_first_match(dmi_lid_device_table);
if (!match) {
pr_info("no compatible Microsoft Surface device found, exiting\n");
return -ENODEV;
}
status = platform_driver_register(&surface_gpe_driver);
if (status)
return status;
fwnode = fwnode_create_software_node(match->driver_data, NULL);
if (IS_ERR(fwnode)) {
status = PTR_ERR(fwnode);
goto err_node;
}
pdev = platform_device_alloc("surface_gpe", PLATFORM_DEVID_NONE);
if (!pdev) {
status = -ENOMEM;
goto err_alloc;
}
pdev->dev.fwnode = fwnode;
status = platform_device_add(pdev);
if (status)
goto err_add;
surface_gpe_device = pdev;
return 0;
err_add:
platform_device_put(pdev);
err_alloc:
fwnode_remove_software_node(fwnode);
err_node:
platform_driver_unregister(&surface_gpe_driver);
return status;
}
module_init(surface_gpe_init);
static void __exit surface_gpe_exit(void)
{
struct fwnode_handle *fwnode = surface_gpe_device->dev.fwnode;
platform_device_unregister(surface_gpe_device);
platform_driver_unregister(&surface_gpe_driver);
fwnode_remove_software_node(fwnode);
}
module_exit(surface_gpe_exit);
MODULE_AUTHOR("Maximilian Luz <luzmaximilian@gmail.com>");
MODULE_DESCRIPTION("Surface GPE/Lid Driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("dmi:*:svnMicrosoftCorporation:pnSurface*:*");
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