| Message ID | 20201028105427.1593764-1-luzmaximilian@gmail.com |
|---|---|
| State | Accepted |
| Commit | 274335f1c557fe6f714b0b3369f6c466b38485c8 |
| Headers | show |
| Series | [v5] platform/surface: Add Driver to set up lid GPEs on MS Surface device | expand |
Hi, On 10/28/20 11:54 AM, Maximilian Luz wrote: > Conventionally, wake-up events for a specific device, in our case the > lid device, are managed via the ACPI _PRW field. While this does not > seem strictly necessary based on ACPI spec, the kernel disables GPE > wakeups to avoid non-wakeup interrupts preventing suspend by default and > only enables GPEs associated via the _PRW field with a wake-up capable > device. This behavior has been introduced in commit f941d3e41da7 ("ACPI: > EC / PM: Disable non-wakeup GPEs for suspend-to-idle") and is described > in more detail in its commit message. > > Unfortunately, on MS Surface devices, there is no _PRW field present on > the lid device, thus no GPE is associated with it, and therefore the GPE > responsible for sending the status-change notification to the lid gets > disabled during suspend, making it impossible to wake the device via the > lid. > > This patch introduces a pseudo-device and respective driver which, based > on some DMI matching, marks the corresponding GPE of the lid device for > wake and enables it during suspend. The behavior of this driver models > the behavior of the ACPI/PM core for normal wakeup GPEs, properly > declared via the _PRW field. > > Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com> Thank you for your patch, I've applied this patch to my review-hans branch: https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans Note it will show up in my review-hans branch once I've pushed my local branch there, which might take a while. Once I've run some tests on this branch the patches there will be added to the platform-drivers-x86/for-next branch and eventually will be included in the pdx86 pull-request to Linus for the next merge-window. Regards, Hans > --- > > Note: This patch depends and is based on > > [PATCH v4] platform/surface: Create a platform subdirectory for > Microsoft Surface devices > > which can be found at > > https://lore.kernel.org/platform-driver-x86/20201009141128.683254-1-luzmaximilian@gmail.com/ > > and is currently in platform-drivers-x86/for-next. > > Changes in v2: > - Use software nodes and device properties instead of platform data. > - Simplify module alias. > - Add comment regarding origin of GPE numbers. > - Fix style issues. > > Changes in v3: > - Rebase onto v5.9-rc5 > - Fix and restructure error handling and module cleanup. > - Remove unnecessary platform_set_drvdata(..., NULL) calls. > - Add pr_fmt definition > - Return -ENODEV if no compatible device is found in module init. > > Changes in v4: > - Rebase onto platform/surface patch-set > - Add copyright line > - Fix typo in comment > > Changes in v5: > - Rebase onto current platform-drivers-x86/for-next > - Fix MAINTAINERS entry > > --- > MAINTAINERS | 6 + > drivers/platform/surface/Kconfig | 10 + > drivers/platform/surface/Makefile | 1 + > drivers/platform/surface/surface_gpe.c | 309 +++++++++++++++++++++++++ > 4 files changed, 326 insertions(+) > create mode 100644 drivers/platform/surface/surface_gpe.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index 38b70bd41d96..17e51a309a3a 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -11658,6 +11658,12 @@ F: drivers/scsi/smartpqi/smartpqi*.[ch] > F: include/linux/cciss*.h > F: include/uapi/linux/cciss*.h > > +MICROSOFT SURFACE GPE LID SUPPORT DRIVER > +M: Maximilian Luz <luzmaximilian@gmail.com> > +L: platform-driver-x86@vger.kernel.org > +S: Maintained > +F: drivers/platform/surface/surface_gpe.c > + > MICROSOFT SURFACE HARDWARE PLATFORM SUPPORT > M: Hans de Goede <hdegoede@redhat.com> > M: Mark Gross <mgross@linux.intel.com> > diff --git a/drivers/platform/surface/Kconfig b/drivers/platform/surface/Kconfig > index 10902ea43861..33040b0b3b79 100644 > --- a/drivers/platform/surface/Kconfig > +++ b/drivers/platform/surface/Kconfig > @@ -40,6 +40,16 @@ config SURFACE_3_POWER_OPREGION > This driver provides support for ACPI operation > region of the Surface 3 battery platform driver. > > +config SURFACE_GPE > + tristate "Surface GPE/Lid Support Driver" > + depends on ACPI > + depends on DMI > + help > + This driver marks the GPEs related to the ACPI lid device found on > + Microsoft Surface devices as wakeup sources and prepares them > + accordingly. It is required on those devices to allow wake-ups from > + suspend by opening the lid. > + > config SURFACE_PRO3_BUTTON > tristate "Power/home/volume buttons driver for Microsoft Surface Pro 3/4 tablet" > depends on ACPI && INPUT > diff --git a/drivers/platform/surface/Makefile b/drivers/platform/surface/Makefile > index dcb1df06d57a..cedfb027ded1 100644 > --- a/drivers/platform/surface/Makefile > +++ b/drivers/platform/surface/Makefile > @@ -7,4 +7,5 @@ > obj-$(CONFIG_SURFACE3_WMI) += surface3-wmi.o > obj-$(CONFIG_SURFACE_3_BUTTON) += surface3_button.o > obj-$(CONFIG_SURFACE_3_POWER_OPREGION) += surface3_power.o > +obj-$(CONFIG_SURFACE_GPE) += surface_gpe.o > obj-$(CONFIG_SURFACE_PRO3_BUTTON) += surfacepro3_button.o > diff --git a/drivers/platform/surface/surface_gpe.c b/drivers/platform/surface/surface_gpe.c > new file mode 100644 > index 000000000000..0f44a52d3a9b > --- /dev/null > +++ b/drivers/platform/surface/surface_gpe.c > @@ -0,0 +1,309 @@ > +// 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*:*"); >
diff --git a/MAINTAINERS b/MAINTAINERS index 38b70bd41d96..17e51a309a3a 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -11658,6 +11658,12 @@ F: drivers/scsi/smartpqi/smartpqi*.[ch] F: include/linux/cciss*.h F: include/uapi/linux/cciss*.h +MICROSOFT SURFACE GPE LID SUPPORT DRIVER +M: Maximilian Luz <luzmaximilian@gmail.com> +L: platform-driver-x86@vger.kernel.org +S: Maintained +F: drivers/platform/surface/surface_gpe.c + MICROSOFT SURFACE HARDWARE PLATFORM SUPPORT M: Hans de Goede <hdegoede@redhat.com> M: Mark Gross <mgross@linux.intel.com> diff --git a/drivers/platform/surface/Kconfig b/drivers/platform/surface/Kconfig index 10902ea43861..33040b0b3b79 100644 --- a/drivers/platform/surface/Kconfig +++ b/drivers/platform/surface/Kconfig @@ -40,6 +40,16 @@ config SURFACE_3_POWER_OPREGION This driver provides support for ACPI operation region of the Surface 3 battery platform driver. +config SURFACE_GPE + tristate "Surface GPE/Lid Support Driver" + depends on ACPI + depends on DMI + help + This driver marks the GPEs related to the ACPI lid device found on + Microsoft Surface devices as wakeup sources and prepares them + accordingly. It is required on those devices to allow wake-ups from + suspend by opening the lid. + config SURFACE_PRO3_BUTTON tristate "Power/home/volume buttons driver for Microsoft Surface Pro 3/4 tablet" depends on ACPI && INPUT diff --git a/drivers/platform/surface/Makefile b/drivers/platform/surface/Makefile index dcb1df06d57a..cedfb027ded1 100644 --- a/drivers/platform/surface/Makefile +++ b/drivers/platform/surface/Makefile @@ -7,4 +7,5 @@ obj-$(CONFIG_SURFACE3_WMI) += surface3-wmi.o obj-$(CONFIG_SURFACE_3_BUTTON) += surface3_button.o obj-$(CONFIG_SURFACE_3_POWER_OPREGION) += surface3_power.o +obj-$(CONFIG_SURFACE_GPE) += surface_gpe.o obj-$(CONFIG_SURFACE_PRO3_BUTTON) += surfacepro3_button.o diff --git a/drivers/platform/surface/surface_gpe.c b/drivers/platform/surface/surface_gpe.c new file mode 100644 index 000000000000..0f44a52d3a9b --- /dev/null +++ b/drivers/platform/surface/surface_gpe.c @@ -0,0 +1,309 @@ +// 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*:*");
Conventionally, wake-up events for a specific device, in our case the lid device, are managed via the ACPI _PRW field. While this does not seem strictly necessary based on ACPI spec, the kernel disables GPE wakeups to avoid non-wakeup interrupts preventing suspend by default and only enables GPEs associated via the _PRW field with a wake-up capable device. This behavior has been introduced in commit f941d3e41da7 ("ACPI: EC / PM: Disable non-wakeup GPEs for suspend-to-idle") and is described in more detail in its commit message. Unfortunately, on MS Surface devices, there is no _PRW field present on the lid device, thus no GPE is associated with it, and therefore the GPE responsible for sending the status-change notification to the lid gets disabled during suspend, making it impossible to wake the device via the lid. This patch introduces a pseudo-device and respective driver which, based on some DMI matching, marks the corresponding GPE of the lid device for wake and enables it during suspend. The behavior of this driver models the behavior of the ACPI/PM core for normal wakeup GPEs, properly declared via the _PRW field. Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com> --- Note: This patch depends and is based on [PATCH v4] platform/surface: Create a platform subdirectory for Microsoft Surface devices which can be found at https://lore.kernel.org/platform-driver-x86/20201009141128.683254-1-luzmaximilian@gmail.com/ and is currently in platform-drivers-x86/for-next. Changes in v2: - Use software nodes and device properties instead of platform data. - Simplify module alias. - Add comment regarding origin of GPE numbers. - Fix style issues. Changes in v3: - Rebase onto v5.9-rc5 - Fix and restructure error handling and module cleanup. - Remove unnecessary platform_set_drvdata(..., NULL) calls. - Add pr_fmt definition - Return -ENODEV if no compatible device is found in module init. Changes in v4: - Rebase onto platform/surface patch-set - Add copyright line - Fix typo in comment Changes in v5: - Rebase onto current platform-drivers-x86/for-next - Fix MAINTAINERS entry --- MAINTAINERS | 6 + drivers/platform/surface/Kconfig | 10 + drivers/platform/surface/Makefile | 1 + drivers/platform/surface/surface_gpe.c | 309 +++++++++++++++++++++++++ 4 files changed, 326 insertions(+) create mode 100644 drivers/platform/surface/surface_gpe.c