diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/platform/surface/Kconfig | 22 | ||||
| -rw-r--r-- | drivers/platform/surface/Makefile | 1 | ||||
| -rw-r--r-- | drivers/platform/surface/surface_platform_profile.c | 190 |
3 files changed, 213 insertions, 0 deletions
diff --git a/drivers/platform/surface/Kconfig b/drivers/platform/surface/Kconfig index 179b8c93d7fd..a045425026ae 100644 --- a/drivers/platform/surface/Kconfig +++ b/drivers/platform/surface/Kconfig @@ -132,6 +132,28 @@ config SURFACE_HOTPLUG Select M or Y here, if you want to (fully) support hot-plugging of dGPU devices on the Surface Book 2 and/or 3 during D3cold. +config SURFACE_PLATFORM_PROFILE + tristate "Surface Platform Profile Driver" + depends on SURFACE_AGGREGATOR_REGISTRY + select ACPI_PLATFORM_PROFILE + help + Provides support for the ACPI platform profile on 5th- and later + generation Microsoft Surface devices. + + More specifically, this driver provides ACPI platform profile support + on Microsoft Surface devices with a Surface System Aggregator Module + (SSAM) connected via the Surface Serial Hub (SSH / SAM-over-SSH). In + other words, this driver provides platform profile support on the + Surface Pro 5, Surface Book 2, Surface Laptop, Surface Laptop Go and + later. On those devices, the platform profile can significantly + influence cooling behavior, e.g. setting it to 'quiet' (default) or + 'low-power' can significantly limit performance of the discrete GPU on + Surface Books, while in turn leading to lower power consumption and/or + less fan noise. + + Select M or Y here, if you want to include ACPI platform profile + support on the above mentioned devices. + config SURFACE_PRO3_BUTTON tristate "Power/home/volume buttons driver for Microsoft Surface Pro 3/4 tablet" depends on INPUT diff --git a/drivers/platform/surface/Makefile b/drivers/platform/surface/Makefile index 80035ee540bf..99372c427b73 100644 --- a/drivers/platform/surface/Makefile +++ b/drivers/platform/surface/Makefile @@ -13,4 +13,5 @@ obj-$(CONFIG_SURFACE_AGGREGATOR_CDEV) += surface_aggregator_cdev.o obj-$(CONFIG_SURFACE_AGGREGATOR_REGISTRY) += surface_aggregator_registry.o obj-$(CONFIG_SURFACE_GPE) += surface_gpe.o obj-$(CONFIG_SURFACE_HOTPLUG) += surface_hotplug.o +obj-$(CONFIG_SURFACE_PLATFORM_PROFILE) += surface_platform_profile.o obj-$(CONFIG_SURFACE_PRO3_BUTTON) += surfacepro3_button.o diff --git a/drivers/platform/surface/surface_platform_profile.c b/drivers/platform/surface/surface_platform_profile.c new file mode 100644 index 000000000000..0081b01a5b0f --- /dev/null +++ b/drivers/platform/surface/surface_platform_profile.c @@ -0,0 +1,190 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Surface Platform Profile / Performance Mode driver for Surface System + * Aggregator Module (thermal subsystem). + * + * Copyright (C) 2021 Maximilian Luz <luzmaximilian@gmail.com> + */ + +#include <asm/unaligned.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/platform_profile.h> +#include <linux/types.h> + +#include <linux/surface_aggregator/device.h> + +enum ssam_tmp_profile { + SSAM_TMP_PROFILE_NORMAL = 1, + SSAM_TMP_PROFILE_BATTERY_SAVER = 2, + SSAM_TMP_PROFILE_BETTER_PERFORMANCE = 3, + SSAM_TMP_PROFILE_BEST_PERFORMANCE = 4, +}; + +struct ssam_tmp_profile_info { + __le32 profile; + __le16 unknown1; + __le16 unknown2; +} __packed; + +struct ssam_tmp_profile_device { + struct ssam_device *sdev; + struct platform_profile_handler handler; +}; + +static SSAM_DEFINE_SYNC_REQUEST_CL_R(__ssam_tmp_profile_get, struct ssam_tmp_profile_info, { + .target_category = SSAM_SSH_TC_TMP, + .command_id = 0x02, +}); + +static SSAM_DEFINE_SYNC_REQUEST_CL_W(__ssam_tmp_profile_set, __le32, { + .target_category = SSAM_SSH_TC_TMP, + .command_id = 0x03, +}); + +static int ssam_tmp_profile_get(struct ssam_device *sdev, enum ssam_tmp_profile *p) +{ + struct ssam_tmp_profile_info info; + int status; + + status = ssam_retry(__ssam_tmp_profile_get, sdev, &info); + if (status < 0) + return status; + + *p = le32_to_cpu(info.profile); + return 0; +} + +static int ssam_tmp_profile_set(struct ssam_device *sdev, enum ssam_tmp_profile p) +{ + __le32 profile_le = cpu_to_le32(p); + + return ssam_retry(__ssam_tmp_profile_set, sdev, &profile_le); +} + +static int convert_ssam_to_profile(struct ssam_device *sdev, enum ssam_tmp_profile p) +{ + switch (p) { + case SSAM_TMP_PROFILE_NORMAL: + return PLATFORM_PROFILE_BALANCED; + + case SSAM_TMP_PROFILE_BATTERY_SAVER: + return PLATFORM_PROFILE_LOW_POWER; + + case SSAM_TMP_PROFILE_BETTER_PERFORMANCE: + return PLATFORM_PROFILE_BALANCED_PERFORMANCE; + + case SSAM_TMP_PROFILE_BEST_PERFORMANCE: + return PLATFORM_PROFILE_PERFORMANCE; + + default: + dev_err(&sdev->dev, "invalid performance profile: %d", p); + return -EINVAL; + } +} + +static int convert_profile_to_ssam(struct ssam_device *sdev, enum platform_profile_option p) +{ + switch (p) { + case PLATFORM_PROFILE_LOW_POWER: + return SSAM_TMP_PROFILE_BATTERY_SAVER; + + case PLATFORM_PROFILE_BALANCED: + return SSAM_TMP_PROFILE_NORMAL; + + case PLATFORM_PROFILE_BALANCED_PERFORMANCE: + return SSAM_TMP_PROFILE_BETTER_PERFORMANCE; + + case PLATFORM_PROFILE_PERFORMANCE: + return SSAM_TMP_PROFILE_BEST_PERFORMANCE; + + default: + /* This should have already been caught by platform_profile_store(). */ + WARN(true, "unsupported platform profile"); + return -EOPNOTSUPP; + } +} + +static int ssam_platform_profile_get(struct platform_profile_handler *pprof, + enum platform_profile_option *profile) +{ + struct ssam_tmp_profile_device *tpd; + enum ssam_tmp_profile tp; + int status; + + tpd = container_of(pprof, struct ssam_tmp_profile_device, handler); + + status = ssam_tmp_profile_get(tpd->sdev, &tp); + if (status) + return status; + + status = convert_ssam_to_profile(tpd->sdev, tp); + if (status < 0) + return status; + + *profile = status; + return 0; +} + +static int ssam_platform_profile_set(struct platform_profile_handler *pprof, + enum platform_profile_option profile) +{ + struct ssam_tmp_profile_device *tpd; + int tp; + + tpd = container_of(pprof, struct ssam_tmp_profile_device, handler); + + tp = convert_profile_to_ssam(tpd->sdev, profile); + if (tp < 0) + return tp; + + return ssam_tmp_profile_set(tpd->sdev, tp); +} + +static int surface_platform_profile_probe(struct ssam_device *sdev) +{ + struct ssam_tmp_profile_device *tpd; + + tpd = devm_kzalloc(&sdev->dev, sizeof(*tpd), GFP_KERNEL); + if (!tpd) + return -ENOMEM; + + tpd->sdev = sdev; + + tpd->handler.profile_get = ssam_platform_profile_get; + tpd->handler.profile_set = ssam_platform_profile_set; + + set_bit(PLATFORM_PROFILE_LOW_POWER, tpd->handler.choices); + set_bit(PLATFORM_PROFILE_BALANCED, tpd->handler.choices); + set_bit(PLATFORM_PROFILE_BALANCED_PERFORMANCE, tpd->handler.choices); + set_bit(PLATFORM_PROFILE_PERFORMANCE, tpd->handler.choices); + + platform_profile_register(&tpd->handler); + return 0; +} + +static void surface_platform_profile_remove(struct ssam_device *sdev) +{ + platform_profile_remove(); +} + +static const struct ssam_device_id ssam_platform_profile_match[] = { + { SSAM_SDEV(TMP, 0x01, 0x00, 0x01) }, + { }, +}; +MODULE_DEVICE_TABLE(ssam, ssam_platform_profile_match); + +static struct ssam_device_driver surface_platform_profile = { + .probe = surface_platform_profile_probe, + .remove = surface_platform_profile_remove, + .match_table = ssam_platform_profile_match, + .driver = { + .name = "surface_platform_profile", + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + }, +}; +module_ssam_device_driver(surface_platform_profile); + +MODULE_AUTHOR("Maximilian Luz <luzmaximilian@gmail.com>"); +MODULE_DESCRIPTION("Platform Profile Support for Surface System Aggregator Module"); +MODULE_LICENSE("GPL"); |