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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118// 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 <benjaminblume@posteo.de> */
#include <linux/hid.h>#include <linux/input.h>#include <linux/module.h>
#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 <benjaminblume@posteo.de>");MODULE_LICENSE("GPL");