From: Gladyshev Ilya Date: Wed, 20 Aug 2025 17:41:32 +0000 (+0300) Subject: platform/x86: Add WMI driver for Redmibook keyboard X-Git-Tag: v6.18-rc1~82^2~54 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=98aadf8e494d2bf66b15d0ef9646ad9fdb6ded15;p=thirdparty%2Fkernel%2Flinux.git platform/x86: Add WMI driver for Redmibook keyboard This driver implements support for various Fn keys (like Cut) and Xiaomi specific AI button. Reviewed-by: Armin Wolf Signed-off-by: Gladyshev Ilya Link: https://lore.kernel.org/r/20250820174140.41410-1-foxido@foxido.dev [ij: use BIT(8) instead of 0x00000100] Reviewed-by: Ilpo Järvinen Signed-off-by: Ilpo Järvinen --- diff --git a/MAINTAINERS b/MAINTAINERS index fe168477caa45..df1bb6be63f98 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -21253,6 +21253,12 @@ S: Maintained T: git https://github.com/pkshih/rtw.git F: drivers/net/wireless/realtek/rtw89/ +REDMIBOOK WMI DRIVERS +M: Gladyshev Ilya +L: platform-driver-x86@vger.kernel.org +S: Maintained +F: drivers/platform/x86/redmi-wmi.c + REDPINE WIRELESS DRIVER L: linux-wireless@vger.kernel.org S: Orphan diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 6d238e120dce7..46e62feeda3c9 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -118,6 +118,18 @@ config XIAOMI_WMI To compile this driver as a module, choose M here: the module will be called xiaomi-wmi. +config REDMI_WMI + tristate "Redmibook WMI key driver" + depends on ACPI_WMI + depends on INPUT + select INPUT_SPARSEKMAP + help + Say Y here if you want support for WMI-based hotkey events on + Xiaomi Redmibook devices. + + To compile this driver as a module, choose M here: the module will + be called redmi-wmi. + config GIGABYTE_WMI tristate "Gigabyte WMI temperature driver" depends on ACPI_WMI diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile index a0c5848513e38..c7db2a88c11a1 100644 --- a/drivers/platform/x86/Makefile +++ b/drivers/platform/x86/Makefile @@ -13,6 +13,7 @@ obj-$(CONFIG_HUAWEI_WMI) += huawei-wmi.o obj-$(CONFIG_MXM_WMI) += mxm-wmi.o obj-$(CONFIG_NVIDIA_WMI_EC_BACKLIGHT) += nvidia-wmi-ec-backlight.o obj-$(CONFIG_XIAOMI_WMI) += xiaomi-wmi.o +obj-$(CONFIG_REDMI_WMI) += redmi-wmi.o obj-$(CONFIG_GIGABYTE_WMI) += gigabyte-wmi.o # Acer diff --git a/drivers/platform/x86/redmi-wmi.c b/drivers/platform/x86/redmi-wmi.c new file mode 100644 index 0000000000000..949236b93a321 --- /dev/null +++ b/drivers/platform/x86/redmi-wmi.c @@ -0,0 +1,130 @@ +// SPDX-License-Identifier: GPL-2.0 +/* WMI driver for Xiaomi Redmibooks */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define WMI_REDMIBOOK_KEYBOARD_EVENT_GUID "46C93E13-EE9B-4262-8488-563BCA757FEF" + +#define AI_KEY_VALUE_MASK BIT(8) + +static const struct key_entry redmi_wmi_keymap[] = { + {KE_KEY, 0x00000201, {KEY_SELECTIVE_SCREENSHOT}}, + {KE_KEY, 0x00000301, {KEY_ALL_APPLICATIONS}}, + {KE_KEY, 0x00001b01, {KEY_SETUP}}, + + /* AI button has code for each position */ + {KE_KEY, 0x00011801, {KEY_ASSISTANT}}, + {KE_KEY, 0x00011901, {KEY_ASSISTANT}}, + + /* Keyboard backlight */ + {KE_IGNORE, 0x00000501, {}}, + {KE_IGNORE, 0x00800501, {}}, + {KE_IGNORE, 0x00050501, {}}, + {KE_IGNORE, 0x000a0501, {}}, + + {KE_END} +}; + +struct redmi_wmi { + struct input_dev *input_dev; + /* Protects the key event sequence */ + struct mutex key_lock; +}; + +static int redmi_wmi_probe(struct wmi_device *wdev, const void *context) +{ + struct redmi_wmi *data; + int err; + + /* Init dev */ + data = devm_kzalloc(&wdev->dev, sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + dev_set_drvdata(&wdev->dev, data); + + err = devm_mutex_init(&wdev->dev, &data->key_lock); + if (err) + return err; + + data->input_dev = devm_input_allocate_device(&wdev->dev); + if (!data->input_dev) + return -ENOMEM; + + data->input_dev->name = "Redmibook WMI keys"; + data->input_dev->phys = "wmi/input0"; + + err = sparse_keymap_setup(data->input_dev, redmi_wmi_keymap, NULL); + if (err) + return err; + + return input_register_device(data->input_dev); +} + +static void redmi_wmi_notify(struct wmi_device *wdev, union acpi_object *obj) +{ + struct key_entry *entry; + struct redmi_wmi *data = dev_get_drvdata(&wdev->dev); + bool autorelease = true; + u32 payload; + int value = 1; + + if (obj->type != ACPI_TYPE_BUFFER) { + dev_err(&wdev->dev, "Bad response type %u\n", obj->type); + return; + } + + if (obj->buffer.length < 32) { + dev_err(&wdev->dev, "Invalid buffer length %u\n", obj->buffer.length); + return; + } + + payload = get_unaligned_le32(obj->buffer.pointer); + entry = sparse_keymap_entry_from_scancode(data->input_dev, payload); + + if (!entry) { + dev_dbg(&wdev->dev, "Unknown WMI event with payload %u", payload); + return; + } + + /* AI key quirk */ + if (entry->keycode == KEY_ASSISTANT) { + value = !(payload & AI_KEY_VALUE_MASK); + autorelease = false; + } + + guard(mutex)(&data->key_lock); + sparse_keymap_report_entry(data->input_dev, entry, value, autorelease); +} + +static const struct wmi_device_id redmi_wmi_id_table[] = { + { WMI_REDMIBOOK_KEYBOARD_EVENT_GUID, NULL }, + { } +}; + +static struct wmi_driver redmi_wmi_driver = { + .driver = { + .name = "redmi-wmi", + .probe_type = PROBE_PREFER_ASYNCHRONOUS, + }, + .id_table = redmi_wmi_id_table, + .probe = redmi_wmi_probe, + .notify = redmi_wmi_notify, + .no_singleton = true, +}; +module_wmi_driver(redmi_wmi_driver); + +MODULE_DEVICE_TABLE(wmi, redmi_wmi_id_table); +MODULE_AUTHOR("Gladyshev Ilya "); +MODULE_DESCRIPTION("Redmibook WMI driver"); +MODULE_LICENSE("GPL");