361 lines
9.8 KiB
Diff
361 lines
9.8 KiB
Diff
From b6ed862e94fa768f9545eee70b690c66371897fb Mon Sep 17 00:00:00 2001
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From: Maximilian Luz <luzmaximilian@gmail.com>
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Date: Sun, 16 Aug 2020 23:39:56 +0200
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Subject: [PATCH 7/7] surface-gpe
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---
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drivers/platform/x86/Kconfig | 9 +
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drivers/platform/x86/Makefile | 1 +
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drivers/platform/x86/surface_gpe.c | 307 +++++++++++++++++++++++++++++
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3 files changed, 317 insertions(+)
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create mode 100644 drivers/platform/x86/surface_gpe.c
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diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
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index 5495e3702f65..e0af35fed2d5 100644
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--- a/drivers/platform/x86/Kconfig
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+++ b/drivers/platform/x86/Kconfig
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@@ -1223,6 +1223,15 @@ config SURFACE_BOOK1_DGPU_SWITCH
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This driver provides a sysfs switch to set the power-state of the
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discrete GPU found on the Microsoft Surface Book 1.
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+config SURFACE_GPE
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+ tristate "Surface GPE/Lid Driver"
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+ depends on ACPI
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+ help
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+ This driver marks the GPEs related to the ACPI lid device found on
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+ Microsoft Surface devices as wakeup sources and prepares them
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+ accordingly. It is required on those devices to allow wake-ups from
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+ suspend by opening the lid.
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+
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config INTEL_PUNIT_IPC
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tristate "Intel P-Unit IPC Driver"
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---help---
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diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
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index b3e0a2c6924b..c6e934a73a8d 100644
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--- a/drivers/platform/x86/Makefile
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+++ b/drivers/platform/x86/Makefile
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@@ -87,6 +87,7 @@ obj-$(CONFIG_SURFACE_PRO3_BUTTON) += surfacepro3_button.o
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obj-$(CONFIG_SURFACE_3_BUTTON) += surface3_button.o
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obj-$(CONFIG_SURFACE_3_POWER_OPREGION) += surface3_power.o
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obj-$(CONFIG_SURFACE_BOOK1_DGPU_SWITCH) += sb1_dgpu_sw.o
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+obj-$(CONFIG_SURFACE_GPE) += surface_gpe.o
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obj-$(CONFIG_INTEL_PUNIT_IPC) += intel_punit_ipc.o
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obj-$(CONFIG_INTEL_BXTWC_PMIC_TMU) += intel_bxtwc_tmu.o
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obj-$(CONFIG_INTEL_TELEMETRY) += intel_telemetry_core.o \
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diff --git a/drivers/platform/x86/surface_gpe.c b/drivers/platform/x86/surface_gpe.c
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new file mode 100644
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index 000000000000..2857e3862ca4
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--- /dev/null
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+++ b/drivers/platform/x86/surface_gpe.c
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@@ -0,0 +1,307 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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+/*
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+ * Surface GPE/Lid driver to enable wakeup from suspend via the lid by
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+ * properly configuring the respective GPEs. Required for wakeup via lid on
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+ * newer Intel-based Microsoft Surface devices.
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+ */
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+
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+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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+
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+#include <linux/acpi.h>
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+#include <linux/dmi.h>
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/platform_device.h>
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+
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+/*
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+ * Note: The GPE numbers for the lid devices found below have been obtained
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+ * from ACPI/the DSDT table, specifically from the GPE handler for the
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+ * lid.
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+ */
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+
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+static const struct property_entry lid_device_props_l17[] = {
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+ PROPERTY_ENTRY_U32("gpe", 0x17),
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+ {},
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+};
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+
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+static const struct property_entry lid_device_props_l4D[] = {
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+ PROPERTY_ENTRY_U32("gpe", 0x4D),
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+ {},
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+};
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+
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+static const struct property_entry lid_device_props_l4F[] = {
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+ PROPERTY_ENTRY_U32("gpe", 0x4F),
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+ {},
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+};
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+
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+static const struct property_entry lid_device_props_l57[] = {
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+ PROPERTY_ENTRY_U32("gpe", 0x57),
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+ {},
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+};
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+
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+/*
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+ * Note: When changing this, don't forget to check that the MODULE_ALIAS below
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+ * still fits.
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+ */
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+static const struct dmi_system_id dmi_lid_device_table[] = {
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+ {
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+ .ident = "Surface Pro 4",
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+ .matches = {
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+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
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+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 4"),
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+ },
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+ .driver_data = (void *)lid_device_props_l17,
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+ },
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+ {
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+ .ident = "Surface Pro 5",
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+ .matches = {
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+ /*
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+ * We match for SKU here due to generic product name
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+ * "Surface Pro".
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+ */
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+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
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+ DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Pro_1796"),
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+ },
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+ .driver_data = (void *)lid_device_props_l4F,
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+ },
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+ {
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+ .ident = "Surface Pro 5 (LTE)",
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+ .matches = {
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+ /*
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+ * We match for SKU here due to generic product name
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+ * "Surface Pro"
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+ */
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+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
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+ DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Pro_1807"),
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+ },
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+ .driver_data = (void *)lid_device_props_l4F,
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+ },
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+ {
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+ .ident = "Surface Pro 6",
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+ .matches = {
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+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
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+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 6"),
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+ },
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+ .driver_data = (void *)lid_device_props_l4F,
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+ },
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+ {
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+ .ident = "Surface Pro 7",
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+ .matches = {
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+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
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+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Pro 7"),
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+ },
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+ .driver_data = (void *)lid_device_props_l4D,
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+ },
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+ {
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+ .ident = "Surface Book 1",
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+ .matches = {
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+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
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+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book"),
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+ },
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+ .driver_data = (void *)lid_device_props_l17,
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+ },
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+ {
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+ .ident = "Surface Book 2",
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+ .matches = {
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+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
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+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book 2"),
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+ },
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+ .driver_data = (void *)lid_device_props_l17,
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+ },
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+ {
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+ .ident = "Surface Book 3",
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+ .matches = {
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+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
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+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Book 3"),
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+ },
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+ .driver_data = (void *)lid_device_props_l4D,
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+ },
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+ {
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+ .ident = "Surface Laptop 1",
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+ .matches = {
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+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
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+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Laptop"),
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+ },
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+ .driver_data = (void *)lid_device_props_l57,
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+ },
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+ {
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+ .ident = "Surface Laptop 2",
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+ .matches = {
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+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
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+ DMI_EXACT_MATCH(DMI_PRODUCT_NAME, "Surface Laptop 2"),
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+ },
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+ .driver_data = (void *)lid_device_props_l57,
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+ },
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+ {
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+ .ident = "Surface Laptop 3 (Intel 13\")",
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+ .matches = {
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+ /*
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+ * We match for SKU here due to different vairants: The
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+ * AMD (15") version does not rely on GPEs.
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+ */
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+ DMI_EXACT_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
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+ DMI_EXACT_MATCH(DMI_PRODUCT_SKU, "Surface_Laptop_3_1867:1868"),
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+ },
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+ .driver_data = (void *)lid_device_props_l4D,
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+ },
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+ { }
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+};
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+
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+struct surface_lid_device {
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+ u32 gpe_number;
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+};
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+
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+static int surface_lid_enable_wakeup(struct device *dev, bool enable)
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+{
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+ const struct surface_lid_device *lid = dev_get_drvdata(dev);
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+ int action = enable ? ACPI_GPE_ENABLE : ACPI_GPE_DISABLE;
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+ acpi_status status;
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+
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+ status = acpi_set_gpe_wake_mask(NULL, lid->gpe_number, action);
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+ if (ACPI_FAILURE(status)) {
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+ dev_err(dev, "failed to set GPE wake mask: %s\n",
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+ acpi_format_exception(status));
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+ return -EINVAL;
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+ }
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+
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+ return 0;
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+}
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+
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+static int surface_gpe_suspend(struct device *dev)
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+{
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+ return surface_lid_enable_wakeup(dev, true);
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+}
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+
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+static int surface_gpe_resume(struct device *dev)
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+{
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+ return surface_lid_enable_wakeup(dev, false);
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+}
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+
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+static SIMPLE_DEV_PM_OPS(surface_gpe_pm, surface_gpe_suspend, surface_gpe_resume);
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+
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+static int surface_gpe_probe(struct platform_device *pdev)
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+{
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+ struct surface_lid_device *lid;
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+ u32 gpe_number;
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+ acpi_status status;
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+ int ret;
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+
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+ ret = device_property_read_u32(&pdev->dev, "gpe", &gpe_number);
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+ if (ret) {
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+ dev_err(&pdev->dev, "failed to read 'gpe' property: %d\n", ret);
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+ return ret;
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+ }
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+
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+ lid = devm_kzalloc(&pdev->dev, sizeof(*lid), GFP_KERNEL);
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+ if (!lid)
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+ return -ENOMEM;
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+
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+ lid->gpe_number = gpe_number;
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+ platform_set_drvdata(pdev, lid);
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+
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+ status = acpi_mark_gpe_for_wake(NULL, gpe_number);
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+ if (ACPI_FAILURE(status)) {
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+ dev_err(&pdev->dev, "failed to mark GPE for wake: %s\n",
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+ acpi_format_exception(status));
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+ return -EINVAL;
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+ }
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+
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+ status = acpi_enable_gpe(NULL, gpe_number);
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+ if (ACPI_FAILURE(status)) {
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+ dev_err(&pdev->dev, "failed to enable GPE: %s\n",
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+ acpi_format_exception(status));
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+ return -EINVAL;
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+ }
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+
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+ ret = surface_lid_enable_wakeup(&pdev->dev, false);
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+ if (ret)
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+ acpi_disable_gpe(NULL, gpe_number);
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+
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+ return ret;
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+}
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+
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+static int surface_gpe_remove(struct platform_device *pdev)
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+{
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+ struct surface_lid_device *lid = dev_get_drvdata(&pdev->dev);
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+
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+ /* restore default behavior without this module */
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+ surface_lid_enable_wakeup(&pdev->dev, false);
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+ acpi_disable_gpe(NULL, lid->gpe_number);
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+
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+ return 0;
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+}
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+
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+static struct platform_driver surface_gpe_driver = {
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+ .probe = surface_gpe_probe,
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+ .remove = surface_gpe_remove,
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+ .driver = {
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+ .name = "surface_gpe",
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+ .pm = &surface_gpe_pm,
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+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
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+ },
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+};
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+
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+static struct platform_device *surface_gpe_device;
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+
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+static int __init surface_gpe_init(void)
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+{
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+ const struct dmi_system_id *match;
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+ struct platform_device *pdev;
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+ struct fwnode_handle *fwnode;
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+ int status;
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+
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+ match = dmi_first_match(dmi_lid_device_table);
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+ if (!match) {
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+ pr_info("no compatible Microsoft Surface device found, exiting\n");
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+ return -ENODEV;
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+ }
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+
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+ status = platform_driver_register(&surface_gpe_driver);
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+ if (status)
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+ return status;
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+
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+ fwnode = fwnode_create_software_node(match->driver_data, NULL);
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+ if (IS_ERR(fwnode)) {
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+ status = PTR_ERR(fwnode);
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+ goto err_node;
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+ }
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+
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+ pdev = platform_device_alloc("surface_gpe", PLATFORM_DEVID_NONE);
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+ if (!pdev) {
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+ status = -ENOMEM;
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+ goto err_alloc;
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+ }
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+
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+ pdev->dev.fwnode = fwnode;
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+
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+ status = platform_device_add(pdev);
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+ if (status)
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+ goto err_add;
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+
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+ surface_gpe_device = pdev;
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+ return 0;
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+
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+err_add:
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+ platform_device_put(pdev);
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+err_alloc:
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+ fwnode_remove_software_node(fwnode);
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+err_node:
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+ platform_driver_unregister(&surface_gpe_driver);
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+ return status;
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+}
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+module_init(surface_gpe_init);
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+
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+static void __exit surface_gpe_exit(void)
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+{
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+ struct fwnode_handle *fwnode = surface_gpe_device->dev.fwnode;
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+
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+ platform_device_unregister(surface_gpe_device);
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+ platform_driver_unregister(&surface_gpe_driver);
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+ fwnode_remove_software_node(fwnode);
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+}
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+module_exit(surface_gpe_exit);
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+
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+MODULE_AUTHOR("Maximilian Luz <luzmaximilian@gmail.com>");
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+MODULE_DESCRIPTION("Surface GPE/Lid Driver");
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+MODULE_LICENSE("GPL");
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+MODULE_ALIAS("dmi:*:svnMicrosoftCorporation:pnSurface*:*");
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--
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2.28.0
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