--- /dev/null
+// 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,
+ },
+ { }
+};
+
+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*:*");
projects / platform / kernel / linux-rpi.git / commitdiff