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[108.228.232.20]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-2be81209142sm721925eec.12.2026.03.10.00.29.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Mar 2026 00:29:49 -0700 (PDT) From: "Derek J. Clark" To: Jiri Kosina , Benjamin Tissoires Cc: Richard Hughes , Mario Limonciello , Zhixin Zhang , Mia Shao , Mark Pearson , "Pierre-Loup A . Griffais" , "Derek J . Clark" , linux-input@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Ethan Tidmore Subject: [PATCH v6 10/19] HID: hid-lenovo-go-s: Add Lenovo Legion Go S Series HID Driver Date: Tue, 10 Mar 2026 07:29:28 +0000 Message-ID: <20260310072937.3295875-11-derekjohn.clark@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260310072937.3295875-1-derekjohn.clark@gmail.com> References: <20260310072937.3295875-1-derekjohn.clark@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Adds initial framework for a new HID driver, hid-lenovo-go-s, along with a uevent to report the firmware version for the MCU. This driver primarily provides access to the configurable settings of the Lenovo Legion Go S controller. It will attach if the controller is in xinput or dinput mode. Non-configuration raw reports are forwarded to ensure the other endpoints continue to function as normal. Reviewed-by: Mark Pearson Co-developed-by: Mario Limonciello Signed-off-by: Mario Limonciello Co-developed-by: Ethan Tidmore Signed-off-by: Ethan Tidmore Signed-off-by: Derek J. Clark --- v6: - Include signdedness bug fix by Ethan Tidmore. - Make local attributes static. - Use NULL instead of 0 in mcu_propery_out when there is no data. v4: - Use dmabuf per request instead of devm allocated static buffer. Resolves bug with side effects during suspend. - Remove unnecessary HID quirks and return to HID_CONNECT_HIDRAW. - Adjust delayed work time to 5ms to fix some side effects during resume when the MCU disconnects in some circumstances. - Cleaner formatting on multiple debug messages. v3: - Include Mario's SOB tag --- MAINTAINERS | 1 + drivers/hid/Kconfig | 12 ++ drivers/hid/Makefile | 1 + drivers/hid/hid-ids.h | 4 + drivers/hid/hid-lenovo-go-s.c | 278 ++++++++++++++++++++++++++++++++++ 5 files changed, 296 insertions(+) create mode 100644 drivers/hid/hid-lenovo-go-s.c diff --git a/MAINTAINERS b/MAINTAINERS index 75d89590f3d2..c81f10292ff7 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -14420,6 +14420,7 @@ M: Derek J. Clark M: Mark Pearson L: linux-input@vger.kernel.org S: Maintained +F: drivers/hid/hid-lenovo-go-s.c F: drivers/hid/hid-lenovo-go.c F: drivers/hid/hid-lenovo.c =20 diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig index 2925dba429f5..10c12d8e6557 100644 --- a/drivers/hid/Kconfig +++ b/drivers/hid/Kconfig @@ -635,6 +635,18 @@ config HID_LENOVO_GO and Legion Go 2 Handheld Console Controllers. Say M here to compile this driver as a module. The module will be called hid-lenovo-go. =20 +config HID_LENOVO_GO_S + tristate "HID Driver for Lenovo Legion Go S Controller" + depends on USB_HID + select LEDS_CLASS + select LEDS_CLASS_MULTICOLOR + help + Support for Lenovo Legion Go S Handheld Console Controller. + + Say Y here to include configuration interface support for the Lenovo Legi= on Go + S. Say M here to compile this driver as a module. The module will be call= ed + hid-lenovo-go-s. + config HID_LETSKETCH tristate "Letsketch WP9620N tablets" depends on USB_HID diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile index 79fbe4e3e2f4..07dfdb6a49c5 100644 --- a/drivers/hid/Makefile +++ b/drivers/hid/Makefile @@ -77,6 +77,7 @@ obj-$(CONFIG_HID_KYSONA) +=3D hid-kysona.o obj-$(CONFIG_HID_LCPOWER) +=3D hid-lcpower.o obj-$(CONFIG_HID_LENOVO) +=3D hid-lenovo.o obj-$(CONFIG_HID_LENOVO_GO) +=3D hid-lenovo-go.o +obj-$(CONFIG_HID_LENOVO_GO_S) +=3D hid-lenovo-go-s.o obj-$(CONFIG_HID_LETSKETCH) +=3D hid-letsketch.o obj-$(CONFIG_HID_LOGITECH) +=3D hid-logitech.o obj-$(CONFIG_HID_LOGITECH) +=3D hid-lg-g15.o diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h index 093ee86ebf90..145eb9921fee 100644 --- a/drivers/hid/hid-ids.h +++ b/drivers/hid/hid-ids.h @@ -739,6 +739,10 @@ #define USB_DEVICE_ID_ITE8595 0x8595 #define USB_DEVICE_ID_ITE_MEDION_E1239T 0xce50 =20 +#define USB_VENDOR_ID_QHE 0x1a86 +#define USB_DEVICE_ID_LENOVO_LEGION_GO_S_XINPUT 0xe310 +#define USB_DEVICE_ID_LENOVO_LEGION_GO_S_DINPUT 0xe311 + #define USB_VENDOR_ID_JABRA 0x0b0e #define USB_DEVICE_ID_JABRA_SPEAK_410 0x0412 #define USB_DEVICE_ID_JABRA_SPEAK_510 0x0420 diff --git a/drivers/hid/hid-lenovo-go-s.c b/drivers/hid/hid-lenovo-go-s.c new file mode 100644 index 000000000000..c9f57dfa145a --- /dev/null +++ b/drivers/hid/hid-lenovo-go-s.c @@ -0,0 +1,278 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * HID driver for Lenovo Legion Go S devices. + * + * Copyright (c) 2026 Derek J. Clark + * Copyright (c) 2026 Valve Corporation + */ +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "hid-ids.h" + +#define GO_S_CFG_INTF_IN 0x84 +#define GO_S_PACKET_SIZE 64 + +static struct hid_gos_cfg { + struct delayed_work gos_cfg_setup; + struct completion send_cmd_complete; + struct hid_device *hdev; + struct mutex cfg_mutex; /*ensure single synchronous output report*/ +} drvdata; + +struct command_report { + u8 cmd; + u8 sub_cmd; + u8 data[63]; +} __packed; + +struct version_report { + u8 cmd; + u32 version; + u8 reserved[59]; +} __packed; + +enum mcu_command_index { + GET_VERSION =3D 0x01, + GET_MCU_ID, + GET_GAMEPAD_CFG, + SET_GAMEPAD_CFG, + GET_TP_PARAM, + SET_TP_PARAM, + GET_RGB_CFG =3D 0x0f, + SET_RGB_CFG, + GET_PL_TEST =3D 0xdf, +}; + +#define FEATURE_NONE 0x00 + +static int hid_gos_version_event(u8 *data) +{ + struct version_report *ver_rep =3D (struct version_report *)data; + + drvdata.hdev->firmware_version =3D get_unaligned_le32(&ver_rep->version); + return 0; +} + +static int get_endpoint_address(struct hid_device *hdev) +{ + struct usb_interface *intf =3D to_usb_interface(hdev->dev.parent); + struct usb_host_endpoint *ep; + + if (intf) { + ep =3D intf->cur_altsetting->endpoint; + if (ep) + return ep->desc.bEndpointAddress; + } + + return -ENODEV; +} + +static int hid_gos_raw_event(struct hid_device *hdev, struct hid_report *r= eport, + u8 *data, int size) +{ + struct command_report *cmd_rep; + int ep, ret; + + ep =3D get_endpoint_address(hdev); + if (ep !=3D GO_S_CFG_INTF_IN) + return 0; + + if (size !=3D GO_S_PACKET_SIZE) + return -EINVAL; + + cmd_rep =3D (struct command_report *)data; + + switch (cmd_rep->cmd) { + case GET_VERSION: + ret =3D hid_gos_version_event(data); + break; + default: + ret =3D -EINVAL; + break; + } + dev_dbg(&hdev->dev, "Rx data as raw input report: [%*ph]\n", + GO_S_PACKET_SIZE, data); + + complete(&drvdata.send_cmd_complete); + return ret; +} + +static int mcu_property_out(struct hid_device *hdev, u8 command, u8 index, + u8 *data, size_t len) +{ + unsigned char *dmabuf __free(kfree) =3D NULL; + u8 header[] =3D { command, index }; + size_t header_size =3D ARRAY_SIZE(header); + int timeout, ret; + + if (header_size + len > GO_S_PACKET_SIZE) + return -EINVAL; + + guard(mutex)(&drvdata.cfg_mutex); + /* We can't use a devm_alloc reusable buffer without side effects during = suspend */ + dmabuf =3D kzalloc(GO_S_PACKET_SIZE, GFP_KERNEL); + if (!dmabuf) + return -ENOMEM; + + memcpy(dmabuf, header, header_size); + memcpy(dmabuf + header_size, data, len); + + dev_dbg(&hdev->dev, "Send data as raw output report: [%*ph]\n", + GO_S_PACKET_SIZE, dmabuf); + + ret =3D hid_hw_output_report(hdev, dmabuf, GO_S_PACKET_SIZE); + if (ret < 0) + return ret; + + ret =3D ret =3D=3D GO_S_PACKET_SIZE ? 0 : -EINVAL; + if (ret) + return ret; + + /* PL_TEST commands can take longer because they go out to another device= */ + timeout =3D (command =3D=3D GET_PL_TEST) ? 200 : 5; + ret =3D wait_for_completion_interruptible_timeout(&drvdata.send_cmd_compl= ete, + msecs_to_jiffies(timeout)); + + if (ret =3D=3D 0) /* timeout occurred */ + ret =3D -EBUSY; + + reinit_completion(&drvdata.send_cmd_complete); + return 0; +} + +static void cfg_setup(struct work_struct *work) +{ + int ret; + + ret =3D mcu_property_out(drvdata.hdev, GET_VERSION, FEATURE_NONE, NULL, 0= ); + if (ret) { + dev_err(&drvdata.hdev->dev, "Failed to retrieve MCU Version: %i\n", ret); + return; + } +} + +static int hid_gos_cfg_probe(struct hid_device *hdev, + const struct hid_device_id *_id) +{ + int ret; + + hid_set_drvdata(hdev, &drvdata); + drvdata.hdev =3D hdev; + mutex_init(&drvdata.cfg_mutex); + + init_completion(&drvdata.send_cmd_complete); + + /* Executing calls prior to returning from probe will lock the MCU. Sched= ule + * initial data call after probe has completed and MCU can accept calls. + */ + INIT_DELAYED_WORK(&drvdata.gos_cfg_setup, &cfg_setup); + ret =3D schedule_delayed_work(&drvdata.gos_cfg_setup, msecs_to_jiffies(2)= ); + if (!ret) { + dev_err(&hdev->dev, "Failed to schedule startup delayed work\n"); + return -ENODEV; + } + + return 0; +} + +static void hid_gos_cfg_remove(struct hid_device *hdev) +{ + guard(mutex)(&drvdata.cfg_mutex); + cancel_delayed_work_sync(&drvdata.gos_cfg_setup); + hid_hw_close(hdev); + hid_hw_stop(hdev); + hid_set_drvdata(hdev, NULL); +} + +static int hid_gos_probe(struct hid_device *hdev, + const struct hid_device_id *id) +{ + int ret, ep; + + ret =3D hid_parse(hdev); + if (ret) { + hid_err(hdev, "Parse failed\n"); + return ret; + } + + ret =3D hid_hw_start(hdev, HID_CONNECT_HIDRAW); + if (ret) { + hid_err(hdev, "Failed to start HID device\n"); + return ret; + } + + ret =3D hid_hw_open(hdev); + if (ret) { + hid_err(hdev, "Failed to open HID device\n"); + hid_hw_stop(hdev); + return ret; + } + + ep =3D get_endpoint_address(hdev); + if (ep !=3D GO_S_CFG_INTF_IN) { + dev_dbg(&hdev->dev, "Started interface %x as generic HID device.\n", ep); + return 0; + } + + ret =3D hid_gos_cfg_probe(hdev, id); + if (ret) + dev_err_probe(&hdev->dev, ret, "Failed to start configuration interface"= ); + + dev_dbg(&hdev->dev, "Started interface %x as Go S configuration interface= \n", ep); + return ret; +} + +static void hid_gos_remove(struct hid_device *hdev) +{ + int ep =3D get_endpoint_address(hdev); + + switch (ep) { + case GO_S_CFG_INTF_IN: + hid_gos_cfg_remove(hdev); + break; + default: + hid_hw_close(hdev); + hid_hw_stop(hdev); + + break; + } +} + +static const struct hid_device_id hid_gos_devices[] =3D { + { HID_USB_DEVICE(USB_VENDOR_ID_QHE, + USB_DEVICE_ID_LENOVO_LEGION_GO_S_XINPUT) }, + { HID_USB_DEVICE(USB_VENDOR_ID_QHE, + USB_DEVICE_ID_LENOVO_LEGION_GO_S_DINPUT) }, + {} +}; + +MODULE_DEVICE_TABLE(hid, hid_gos_devices); +static struct hid_driver hid_lenovo_go_s =3D { + .name =3D "hid-lenovo-go-s", + .id_table =3D hid_gos_devices, + .probe =3D hid_gos_probe, + .remove =3D hid_gos_remove, + .raw_event =3D hid_gos_raw_event, +}; +module_hid_driver(hid_lenovo_go_s); + +MODULE_AUTHOR("Derek J. Clark"); +MODULE_DESCRIPTION("HID Driver for Lenovo Legion Go S Series gamepad."); +MODULE_LICENSE("GPL"); --=20 2.53.0