From 663870a84c1734b2817f51d93c0e61f1dc1c5f1e Mon Sep 17 00:00:00 2001 From: Benjamin Blume Date: Mon, 13 Jul 2026 12:42:13 +0000 Subject: HID: hyperx: add driver for the HyperX QuadCast 2 mute button The tap-to-mute button of the HyperX QuadCast 2 (03f0:07b4) is handled entirely in the device firmware. The firmware gates the audio internally but never sends the Telephony "Phone Mute" usage (0x2f) that its own report descriptor advertises, and it does not touch the UAC feature unit either. Consequently neither an evdev key event nor an ALSA mixer change is ever generated, and userspace has no way to learn that the microphone was muted: desktops keep showing the microphone as live, and conferencing applications keep displaying an unmuted microphone while transmitting silence. The mute state is reported through a vendor-defined collection instead: 06 c0 ff Usage Page (Vendor-Defined 0xFFC0) a1 01 Collection (Application) 06 c1 ff Usage Page (Vendor-Defined 0xFFC1) 85 77 Report ID (0x77) 09 f0 Usage (0xF0) 75 08 95 3f Report Size (8), Report Count (63) 81 02 Input (Data,Var,Abs) Pressing the button emits a 64-byte report on that collection: 77 06 00 00 ... microphone unmuted 77 06 01 00 ... microphone muted where byte 1 identifies the mute event and byte 2 carries the resulting state. As the payload is an opaque vendor blob carrying no HID usages, hid-input cannot map it and a hwdb entry cannot express it either. Add a driver that decodes the report and emits KEY_MICMUTE, which makes the button behave like any other microphone mute key. Note that the device reports the resulting absolute state, whereas KEY_MICMUTE is a momentary key that userspace acts on as a toggle, so the driver emits one keypress per state change. Tested on a HyperX QuadCast 2 (03f0:07b4). Signed-off-by: Benjamin Blume Signed-off-by: Jiri Kosina --- MAINTAINERS | 6 +++ drivers/hid/Kconfig | 13 ++++++ drivers/hid/Makefile | 1 + drivers/hid/hid-hyperx.c | 117 +++++++++++++++++++++++++++++++++++++++++++++++ drivers/hid/hid-ids.h | 1 + 5 files changed, 138 insertions(+) create mode 100644 drivers/hid/hid-hyperx.c diff --git a/MAINTAINERS b/MAINTAINERS index f37a81950e25..0f45c4be7c3b 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -11530,6 +11530,12 @@ F: include/uapi/linux/hid* F: samples/hid/ F: tools/testing/selftests/hid/ +HID HYPERX DRIVER +M: Benjamin Blume +L: linux-input@vger.kernel.org +S: Maintained +F: drivers/hid/hid-hyperx.c + HID LOGITECH DRIVERS R: Filipe Laíns L: linux-input@vger.kernel.org diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig index f9bcaeb66385..e00bac8f4271 100644 --- a/drivers/hid/Kconfig +++ b/drivers/hid/Kconfig @@ -433,6 +433,19 @@ config HOLTEK_FF Say Y here if you have a Holtek On Line Grip based game controller and want to have force feedback support for it. +config HID_HYPERX + tristate "HyperX microphones" + depends on USB_HID + help + Support for the mute button of HyperX microphones. + + The button is handled in the device firmware and only reports the + resulting mute state through a vendor-defined collection, so without + this driver userspace never learns that the microphone was muted. + + Supported devices: + - HyperX QuadCast 2 + config HID_VIVALDI_COMMON tristate help diff --git a/drivers/hid/Makefile b/drivers/hid/Makefile index 23e6e3dd0c56..4138be76bf34 100644 --- a/drivers/hid/Makefile +++ b/drivers/hid/Makefile @@ -67,6 +67,7 @@ obj-$(CONFIG_HID_HOLTEK) += hid-holtek-kbd.o obj-$(CONFIG_HID_HOLTEK) += hid-holtek-mouse.o obj-$(CONFIG_HID_HOLTEK) += hid-holtekff.o obj-$(CONFIG_HID_HYPERV_MOUSE) += hid-hyperv.o +obj-$(CONFIG_HID_HYPERX) += hid-hyperx.o obj-$(CONFIG_HID_ICADE) += hid-icade.o obj-$(CONFIG_HID_ITE) += hid-ite.o obj-$(CONFIG_HID_JABRA) += hid-jabra.o diff --git a/drivers/hid/hid-hyperx.c b/drivers/hid/hid-hyperx.c new file mode 100644 index 000000000000..18d2dc24cc76 --- /dev/null +++ b/drivers/hid/hid-hyperx.c @@ -0,0 +1,117 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * HID driver for the HyperX QuadCast 2 microphone + * + * The tap-to-mute button is handled entirely in the device firmware: it gates + * the audio internally and does not send the Telephony "Phone Mute" usage its + * own report descriptor advertises. The resulting mute state is only reported + * through a vendor-defined collection, which hid-input cannot map, so the + * button is invisible to userspace. + * + * Copyright (c) 2026 Benjamin Blume + */ + +#include +#include +#include + +#include "hid-ids.h" + +#define HYPERX_QC2_REPORT_ID 0x77 +#define HYPERX_QC2_EVENT_MUTE 0x06 +#define HYPERX_QC2_MUTE_LEN 3 + +struct hyperx_drvdata { + struct input_dev *input; + bool muted; + bool have_state; +}; + +static int hyperx_input_configured(struct hid_device *hdev, + struct hid_input *hi) +{ + struct hyperx_drvdata *drvdata = hid_get_drvdata(hdev); + + /* + * The device exposes several application collections. Prefer the + * telephony one, which already advertises KEY_MICMUTE, and fall back + * to the first collection otherwise. + */ + if (!drvdata->input || test_bit(KEY_MICMUTE, hi->input->keybit)) { + drvdata->input = hi->input; + input_set_capability(drvdata->input, EV_KEY, KEY_MICMUTE); + } + + return 0; +} + +static int hyperx_raw_event(struct hid_device *hdev, struct hid_report *report, + u8 *data, int size) +{ + struct hyperx_drvdata *drvdata = hid_get_drvdata(hdev); + bool muted; + + if (!(hdev->claimed & HID_CLAIMED_INPUT) || !drvdata->input) + return 0; + + if (size < HYPERX_QC2_MUTE_LEN || data[0] != HYPERX_QC2_REPORT_ID || + data[1] != HYPERX_QC2_EVENT_MUTE) + return 0; + + muted = data[2]; + if (drvdata->have_state && muted == drvdata->muted) + return 0; + + drvdata->muted = muted; + drvdata->have_state = true; + + /* + * The device reports the resulting absolute state, while KEY_MICMUTE is + * a momentary key that userspace acts on as a toggle. Emit one + * keypress per state change. + */ + input_report_key(drvdata->input, KEY_MICMUTE, 1); + input_sync(drvdata->input); + input_report_key(drvdata->input, KEY_MICMUTE, 0); + input_sync(drvdata->input); + + return 0; +} + +static int hyperx_probe(struct hid_device *hdev, const struct hid_device_id *id) +{ + struct hyperx_drvdata *drvdata; + int ret; + + drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL); + if (!drvdata) + return -ENOMEM; + + hid_set_drvdata(hdev, drvdata); + + ret = hid_parse(hdev); + if (ret) + return ret; + + return hid_hw_start(hdev, HID_CONNECT_DEFAULT); +} + +static const struct hid_device_id hyperx_devices[] = { + { HID_USB_DEVICE(USB_VENDOR_ID_HP, + USB_PRODUCT_ID_HP_HYPERX_QUADCAST_2) }, + { } +}; +MODULE_DEVICE_TABLE(hid, hyperx_devices); + +static struct hid_driver hyperx_driver = { + .name = "hyperx", + .id_table = hyperx_devices, + .probe = hyperx_probe, + .input_configured = hyperx_input_configured, + .raw_event = hyperx_raw_event, +}; +module_hid_driver(hyperx_driver); + +MODULE_DESCRIPTION("HID driver for the HyperX QuadCast 2 microphone"); +MODULE_AUTHOR("Benjamin Blume "); +MODULE_LICENSE("GPL"); diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h index 1059922baaac..76674b33e808 100644 --- a/drivers/hid/hid-ids.h +++ b/drivers/hid/hid-ids.h @@ -688,6 +688,7 @@ #define USB_DEVICE_ID_HORI_WIRELESS_SWITCH_PAD 0x00f6 #define USB_VENDOR_ID_HP 0x03f0 +#define USB_PRODUCT_ID_HP_HYPERX_QUADCAST_2 0x07b4 #define USB_PRODUCT_ID_HP_ELITE_PRESENTER_MOUSE_464A 0x464a #define USB_PRODUCT_ID_HP_LOGITECH_OEM_USB_OPTICAL_MOUSE_0A4A 0x0a4a #define USB_PRODUCT_ID_HP_LOGITECH_OEM_USB_OPTICAL_MOUSE_0B4A 0x0b4a -- cgit v1.2.3