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[100.11.178.145]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8ceccdcb3c5sm226713036d6.21.2026.06.09.14.26.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Jun 2026 14:26:38 -0700 (PDT) From: Dave Carey To: platform-driver-x86@vger.kernel.org Cc: johannes.goede@oss.qualcomm.com, mpearson-lenovo@squebb.ca, ilpo.jarvinen@linux.intel.com, armin.wolf@outlook.de, linux-kernel@vger.kernel.org, Dave Carey Subject: [PATCH v7 2/2] platform/x86/lenovo: Add Yoga Book 9 keyboard dock detection driver Date: Tue, 9 Jun 2026 17:26:31 -0400 Message-ID: <20260609212631.925943-3-carvsdriver@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260609212631.925943-1-carvsdriver@gmail.com> References: <20260608215205.678182-1-carvsdriver@gmail.com> <20260609212631.925943-1-carvsdriver@gmail.com> Precedence: bulk X-Mailing-List: platform-driver-x86@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The Lenovo Yoga Book 9 14IAH10 ships with a detachable Bluetooth keyboard that magnetically attaches to the bottom (secondary) screen in one of two positions. The Embedded Controller tracks the attachment state in a 2-bit field called BKBD and signals changes via WMI event GUID 806BD2A2-177B-481D-BFB5-3BA0BB4A2285 (notify ID 0xEB on the WM10 ACPI device, _UID "GMZN"). The device contains embedded BMOF data (WQDD, 20705 bytes) documenting both WMI interfaces used by this driver: LENOVO_BTKBD_EVENT (event GUID): WmiDataId(1) uint32 Status. The ACPI _WED(0xEB) method returns EC.BKBD directly as an integer, so the notify callback receives BKBD without a separate query. LENOVO_FEATURE_STATUS_DATA (block GUID, WQAF method): returns an 8-byte buffer {uint32 IDs=0x00060000, uint32 Status=BKBD}. Used for the initial state read on probe and after resume. BKBD encoding: 0 = keyboard detached 1 = keyboard docked on top half of bottom screen 2 = keyboard docked on bottom half of bottom screen 3 = reserved (not observed in practice) This driver: - Registers two WMI drivers: one on the event GUID (LENOVO_BTKBD_EVENT) and one on the block GUID (LENOVO_FEATURE_STATUS_DATA). - On probe, reads initial BKBD state via wmidev_query_block() on the block device; whichever driver probes last triggers the initial read. - On WMI notification, reads BKBD directly from the event data integer (ACPI _WED(0xEB) returns EC.BKBD) without a redundant WQAF call. - Reports SW_TABLET_MODE=1 when detached, SW_TABLET_MODE=0 when docked in either position (a physical keyboard is present in both cases). - Exposes the raw BKBD value via read-only sysfs attribute "keyboard_position". - Re-reads BKBD state on resume from suspend or hibernation. Tested on: Lenovo Yoga Book 9 14IAH10 (model 83KJ), kernel 7.0. Signed-off-by: Dave Carey --- v7: - Use wmidev_query_block() in place of deprecated wmidev_block_query(). Use __free(kfree) to manage the output buffer; simplify the parsing to a single length check now that the WMI core handles type conversion. - Define BKBD_FIELD with GENMASK() and extract the field with FIELD_GET() instead of open-coded masking. - Use guard(mutex) for all lock/unlock pairs. - Add yb9_kbdock_sync_locked() helper to consolidate the duplicated initial-state read pattern in event_probe, block_probe, and resume. - Add linux/bitfield.h, linux/cleanup.h, linux/slab.h includes. - Fix comment on struct mutex field; use Context:/Returns: sections in the kerneldoc comment for yb9_kbdock_query_locked(). v6: - Submitted as 2/2; patch 1/2 adds a DMI early-exit to lenovo-ymc to prevent duplicate SW_TABLET_MODE input nodes on the YB9. v5: - Rewrote as two WMI drivers (event + block) to avoid the deprecated wmi_query_block() API: event driver owns the GUID that delivers notifications, block driver owns the GUID used for querying state. Either can probe first; both probe callbacks check whether the other has already probed and fire the initial read when both are ready. - Use wmidev_block_query() on the block wmi_device directly (replaces the deprecated wmi_query_block()). - In the notify callback, read BKBD directly from the event data integer passed by the WMI core (_WED(0xEB) returns EC.BKBD; confirmed by decoding the embedded BMOF from WQDD). Eliminates the redundant WQAF call that v4 made on every notification. - Documented the two BMOF classes (LENOVO_BTKBD_EVENT and LENOVO_FEATURE_STATUS_DATA) with field layouts in the commit message and file header. - sysfs keyboard_position: output bare integer, drop the parenthetical position-name suffix that a couple of reviewers found non-standard. - Set .no_singleton = true on both WMI drivers (was missing from block driver in v4). - Add PM resume callback (yb9_kbdock_resume) to re-read BKBD state after suspend/hibernation. v4: - Dropped module_wmi_driver(); registered two WMI drivers manually to allow sharing state. module_init/exit pair registers/unregisters both. - Added ATTRIBUTE_GROUPS() and .dev_groups for the sysfs attribute. - sysfs show: performed a live query instead of returning a cached value. v3: - Switched to devm_input_allocate_device(). - Added DMI guard (dmi_check_system) to reject non-YB9 machines. - Removed redundant MODULE_DEVICE_TABLE on block driver. v2: - Added .no_singleton = true on the event WMI driver. - Added PM suspend/resume skeleton. - Fixed MODULE_LICENSE to "GPL" (was "GPL v2"). .../testing/sysfs-driver-lenovo-yb9-kbdock | 19 + MAINTAINERS | 7 + drivers/platform/x86/lenovo/Kconfig | 14 + drivers/platform/x86/lenovo/Makefile | 1 + drivers/platform/x86/lenovo/yb9-kbdock.c | 317 ++++++++++++++++++ 5 files changed, 358 insertions(+) create mode 100644 Documentation/ABI/testing/sysfs-driver-lenovo-yb9-kbdock create mode 100644 drivers/platform/x86/lenovo/yb9-kbdock.c diff --git a/Documentation/ABI/testing/sysfs-driver-lenovo-yb9-kbdock b/Documentation/ABI/testing/sysfs-driver-lenovo-yb9-kbdock new file mode 100644 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-lenovo-yb9-kbdock @@ -0,0 +1,19 @@ +What: /sys/bus/wmi/drivers/lenovo-yb9-kbdock//keyboard_position +Date: April 2026 +KernelVersion: 6.10 +Contact: Dave Carey +Description: + Read-only attribute reporting the current keyboard dock position + as reported by the Embedded Controller on the Lenovo Yoga Book 9 + 14IAH10. + + Possible values: + + == ============================================================= + 0 keyboard is not docked to any screen (detached) + 1 keyboard docked on the top half of the bottom screen + 2 keyboard docked on the bottom half of the bottom screen + == ============================================================= + + SW_TABLET_MODE input events are also emitted: 0 when the keyboard + is docked (either position), 1 when detached. diff --git a/MAINTAINERS b/MAINTAINERS --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14479,6 +14479,13 @@ L: platform-driver-x86@vger.kernel.org S: Maintained F: drivers/platform/x86/lenovo/wmi-hotkey-utilities.c +LENOVO YOGA BOOK 9 KEYBOARD DOCK DRIVER +M: Dave Carey +L: platform-driver-x86@vger.kernel.org +S: Maintained +F: Documentation/ABI/testing/sysfs-driver-lenovo-yb9-kbdock +F: drivers/platform/x86/lenovo/yb9-kbdock.c + LETSKETCH HID TABLET DRIVER M: Hans de Goede L: linux-input@vger.kernel.org diff --git a/drivers/platform/x86/lenovo/Kconfig b/drivers/platform/x86/lenovo/Kconfig --- a/drivers/platform/x86/lenovo/Kconfig +++ b/drivers/platform/x86/lenovo/Kconfig @@ -43,6 +43,20 @@ config LENOVO_WMI_CAMERA To compile this driver as a module, choose M here: the module will be called lenovo-wmi-camera. +config LENOVO_YB9_KBDOCK + tristate "Lenovo Yoga Book 9 keyboard dock detection" + depends on ACPI_WMI + depends on DMI + depends on INPUT + help + Say Y here to enable keyboard dock detection on the Lenovo Yoga Book 9 + 14IAH10. The detachable Bluetooth keyboard magnetically attaches to + either screen; this driver reports SW_TABLET_MODE input events based + on the attachment state and exposes the raw position in sysfs. + + To compile this driver as a module, choose M here: the module will be + called lenovo-yb9-kbdock. + config LENOVO_YMC tristate "Lenovo Yoga Tablet Mode Control" depends on ACPI_WMI diff --git a/drivers/platform/x86/lenovo/Makefile b/drivers/platform/x86/lenovo/Makefile --- a/drivers/platform/x86/lenovo/Makefile +++ b/drivers/platform/x86/lenovo/Makefile @@ -8,6 +8,7 @@ obj-$(CONFIG_THINKPAD_LMI) += think-lmi.o obj-$(CONFIG_THINKPAD_ACPI) += thinkpad_acpi.o lenovo-target-$(CONFIG_LENOVO_WMI_HOTKEY_UTILITIES) += wmi-hotkey-utilities.o +lenovo-target-$(CONFIG_LENOVO_YB9_KBDOCK) += yb9-kbdock.o lenovo-target-$(CONFIG_LENOVO_YMC) += ymc.o lenovo-target-$(CONFIG_YOGABOOK) += yogabook.o lenovo-target-$(CONFIG_YT2_1380) += yoga-tab2-pro-1380-fastcharger.o diff --git a/drivers/platform/x86/lenovo/yb9-kbdock.c b/drivers/platform/x86/lenovo/yb9-kbdock.c new file mode 100644 --- /dev/null +++ b/drivers/platform/x86/lenovo/yb9-kbdock.c @@ -0,0 +1,317 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Lenovo Yoga Book 9 keyboard-dock detection + * + * The Yoga Book 9 ships with a detachable Bluetooth keyboard that magnetically + * attaches to the bottom screen in one of two positions. The EC tracks + * attachment state in a 2-bit field called BKBD and signals changes via WMI + * event 0xEB on the WM10 ACPI device (_UID "GMZN"). + * + * BKBD values: + * 0 = keyboard detached + * 1 = keyboard docked on the top half of the bottom screen + * 2 = keyboard docked on the bottom half of the bottom screen + * 3 = reserved / not observed + * + * Two WMI interfaces are used (documented in embedded BMOF, WQDD, 20705 bytes): + * + * LENOVO_BTKBD_EVENT (event GUID, 806BD2A2-...) + * WmiDataId(1) uint32 Status — _WED(0xEB) returns EC.BKBD directly. + * The notify callback receives BKBD as an integer; no separate query needed. + * + * LENOVO_FEATURE_STATUS_DATA (block GUID, E7F300FA-...) + * WmiDataId(1) uint32 IDs = 0x00060000 (feature selector) + * WmiDataId(2) uint32 Status = BKBD value + * Used on probe and resume to read initial state. + * + * SW_TABLET_MODE=1 is reported when the keyboard is detached; + * SW_TABLET_MODE=0 when docked in either position (keyboard present). + * The raw BKBD value is exposed via the sysfs attribute "keyboard_position". + * + * Copyright (C) 2026 Dave Carey + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define YB9_KBDOCK_EVENT_GUID "806BD2A2-177B-481D-BFB5-3BA0BB4A2285" +#define YB9_KBDOCK_QUERY_GUID "E7F300FA-21CD-4003-ADAC-2696135982E6" + +/* 2-bit EC field encoding the keyboard dock position */ +#define BKBD_FIELD GENMASK(1, 0) + +/* BKBD encoding */ +#define BKBD_DETACHED 0 +#define BKBD_TOP_HALF 1 +#define BKBD_BOTTOM_HALF 2 + +static const struct dmi_system_id yb9_kbdock_dmi_table[] = { + { + /* Lenovo Yoga Book 9 14IAH10 */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), + DMI_MATCH(DMI_PRODUCT_NAME, "83KJ"), + }, + }, + { } +}; + +/* + * Shared state between the event and block WMI drivers. Protected by lock. + * The lock may be held across wmidev_query_block() calls (which can sleep); + * block_remove() acquires the lock before clearing block_wdev, ensuring + * block_wdev remains valid for the duration of any in-progress query. + */ +static struct { + struct mutex lock; /* protects input_dev and block_wdev */ + struct input_dev *input_dev; /* set by event probe */ + struct wmi_device *block_wdev; /* set by block probe */ +} yb9; + +/** + * yb9_kbdock_query_locked() - Read BKBD from the block device. + * @log_dev: Device for logging. + * + * Context: Caller must hold yb9.lock. + * Returns: 0-3 on success, -errno on failure. + */ +static int yb9_kbdock_query_locked(struct device *log_dev) +{ + struct wmi_buffer out = {}; + void *data __free(kfree) = NULL; + u32 bkbd; + int ret; + + if (!yb9.block_wdev) + return -ENODEV; + + ret = wmidev_query_block(yb9.block_wdev, 0, &out); + if (ret) { + dev_warn(log_dev, "WQAF failed: %d\n", ret); + return ret; + } + + data = out.data; + + /* + * LENOVO_FEATURE_STATUS_DATA: 8-byte buffer {IDs=0x00060000, Status=BKBD}. + * BKBD is at bytes 4-7. + */ + if (out.length < 8) { + dev_warn(log_dev, "WQAF: buffer too short (%zu)\n", out.length); + return -EIO; + } + + memcpy(&bkbd, (u8 *)data + 4, sizeof(bkbd)); + return (int)FIELD_GET(BKBD_FIELD, bkbd); +} + +/* Report SW_TABLET_MODE from BKBD. Caller must hold yb9.lock. */ +static void yb9_kbdock_report_locked(int bkbd, struct device *log_dev) +{ + int tablet = (bkbd == BKBD_DETACHED) ? 1 : 0; + + input_report_switch(yb9.input_dev, SW_TABLET_MODE, tablet); + input_sync(yb9.input_dev); + dev_dbg(log_dev, "BKBD=%d SW_TABLET_MODE=%d\n", bkbd, tablet); +} + +/* Read BKBD and report if both WMI devices are ready. Caller must hold yb9.lock. */ +static void yb9_kbdock_sync_locked(struct device *log_dev) +{ + int bkbd; + + if (!yb9.input_dev || !yb9.block_wdev) + return; + + bkbd = yb9_kbdock_query_locked(log_dev); + if (bkbd >= 0) + yb9_kbdock_report_locked(bkbd, log_dev); +} + +/* ------------------------------------------------------------------ + * sysfs + * ------------------------------------------------------------------ */ + +static ssize_t keyboard_position_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int bkbd; + + guard(mutex)(&yb9.lock); + bkbd = yb9_kbdock_query_locked(dev); + + if (bkbd < 0) + return bkbd; + return sysfs_emit(buf, "%u\n", (unsigned int)bkbd); +} +static DEVICE_ATTR_RO(keyboard_position); + +static struct attribute *yb9_kbdock_attrs[] = { + &dev_attr_keyboard_position.attr, + NULL, +}; +ATTRIBUTE_GROUPS(yb9_kbdock); + +/* ------------------------------------------------------------------ + * Event WMI driver — LENOVO_BTKBD_EVENT + * ------------------------------------------------------------------ */ + +static void yb9_kbdock_notify(struct wmi_device *wdev, union acpi_object *data) +{ + u32 bkbd; + + /* + * _WED(0xEB) returns EC.BKBD directly as an integer + * (LENOVO_BTKBD_EVENT WmiDataId(1) uint32 Status). + */ + if (!data || data->type != ACPI_TYPE_INTEGER) { + dev_warn(&wdev->dev, "unexpected event data type %d\n", + data ? data->type : -1); + return; + } + bkbd = FIELD_GET(BKBD_FIELD, data->integer.value); + + guard(mutex)(&yb9.lock); + if (yb9.input_dev) + yb9_kbdock_report_locked(bkbd, &wdev->dev); +} + +static int yb9_kbdock_event_probe(struct wmi_device *wdev, const void *ctx) +{ + struct input_dev *input_dev; + int err; + + if (!dmi_check_system(yb9_kbdock_dmi_table)) + return -ENODEV; + + input_dev = devm_input_allocate_device(&wdev->dev); + if (!input_dev) + return -ENOMEM; + + input_dev->name = "Lenovo Yoga Book 9 keyboard dock switch"; + input_dev->phys = YB9_KBDOCK_EVENT_GUID "/input0"; + input_dev->id.bustype = BUS_HOST; + input_set_capability(input_dev, EV_SW, SW_TABLET_MODE); + + err = input_register_device(input_dev); + if (err) + return err; + + guard(mutex)(&yb9.lock); + yb9.input_dev = input_dev; + yb9_kbdock_sync_locked(&wdev->dev); + return 0; +} + +static void yb9_kbdock_event_remove(struct wmi_device *wdev) +{ + guard(mutex)(&yb9.lock); + yb9.input_dev = NULL; +} + +static int yb9_kbdock_resume(struct device *dev) +{ + guard(mutex)(&yb9.lock); + yb9_kbdock_sync_locked(dev); + return 0; +} + +static DEFINE_SIMPLE_DEV_PM_OPS(yb9_kbdock_pm_ops, NULL, yb9_kbdock_resume); + +static const struct wmi_device_id yb9_kbdock_event_id_table[] = { + { .guid_string = YB9_KBDOCK_EVENT_GUID }, + { } +}; +MODULE_DEVICE_TABLE(wmi, yb9_kbdock_event_id_table); + +static struct wmi_driver yb9_kbdock_event_driver = { + .driver = { + .name = "lenovo-yb9-kbdock", + .dev_groups = yb9_kbdock_groups, + .pm = pm_sleep_ptr(&yb9_kbdock_pm_ops), + }, + .id_table = yb9_kbdock_event_id_table, + .no_singleton = true, + .probe = yb9_kbdock_event_probe, + .remove = yb9_kbdock_event_remove, + .notify = yb9_kbdock_notify, +}; + +/* ------------------------------------------------------------------ + * Block WMI driver — LENOVO_FEATURE_STATUS_DATA + * ------------------------------------------------------------------ */ + +static int yb9_kbdock_block_probe(struct wmi_device *wdev, const void *ctx) +{ + if (!dmi_check_system(yb9_kbdock_dmi_table)) + return -ENODEV; + + guard(mutex)(&yb9.lock); + yb9.block_wdev = wdev; + yb9_kbdock_sync_locked(&wdev->dev); + return 0; +} + +static void yb9_kbdock_block_remove(struct wmi_device *wdev) +{ + guard(mutex)(&yb9.lock); + yb9.block_wdev = NULL; +} + +static const struct wmi_device_id yb9_kbdock_block_id_table[] = { + { .guid_string = YB9_KBDOCK_QUERY_GUID }, + { } +}; + +static struct wmi_driver yb9_kbdock_block_driver = { + .driver = { + .name = "lenovo-yb9-kbdock-block", + }, + .id_table = yb9_kbdock_block_id_table, + .no_singleton = true, + .probe = yb9_kbdock_block_probe, + .remove = yb9_kbdock_block_remove, +}; + +/* ------------------------------------------------------------------ + * Module init / exit + * ------------------------------------------------------------------ */ + +static int __init yb9_kbdock_init(void) +{ + int ret; + + mutex_init(&yb9.lock); + + ret = wmi_driver_register(&yb9_kbdock_event_driver); + if (ret) + return ret; + + ret = wmi_driver_register(&yb9_kbdock_block_driver); + if (ret) { + wmi_driver_unregister(&yb9_kbdock_event_driver); + return ret; + } + return 0; +} +module_init(yb9_kbdock_init); + +static void __exit yb9_kbdock_exit(void) +{ + wmi_driver_unregister(&yb9_kbdock_block_driver); + wmi_driver_unregister(&yb9_kbdock_event_driver); +} +module_exit(yb9_kbdock_exit); + +MODULE_AUTHOR("Dave Carey "); +MODULE_DESCRIPTION("Lenovo Yoga Book 9 keyboard dock detection"); +MODULE_LICENSE("GPL"); -- 2.54.0