1 files changed, 321 insertions, 0 deletions
diff --git a/drivers/platform/surface/surface_gpe.c b/drivers/platform/surface/surface_gpe.c
new file mode 100644
index 000000000000..e49e5d6d5d4e
--- /dev/null
+++ b/drivers/platform/surface/surface_gpe.c
@@ -0,0 +1,321 @@
+// 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*:*");