| 1 | |
| 2 | |
| 3 | * HID driver for the HyperX QuadCast 2 microphone
|
| 4 | *
|
| 5 | * The tap-to-mute button is handled entirely in the device firmware: it gates
|
| 6 | * the audio internally and does not send the Telephony "Phone Mute" usage its
|
| 7 | * own report descriptor advertises. The resulting mute state is only reported
|
| 8 | * through a vendor-defined collection, which hid-input cannot map, so the
|
| 9 | * button is invisible to userspace.
|
| 10 | *
|
| 11 | * Copyright (c) 2026 Benjamin Blume <[email protected]>
|
| 12 |
|
| 13 |
|
| 14 | #include <linux/hid.h>
|
| 15 | #include <linux/input.h>
|
| 16 | #include <linux/module.h>
|
| 17 |
|
| 18 | #include "hid-ids.h"
|
| 19 |
|
| 20 | #define HYPERX_QC2_REPORT_ID 0x77
|
| 21 | #define HYPERX_QC2_EVENT_MUTE 0x06
|
| 22 | #define HYPERX_QC2_MUTE_LEN 3
|
| 23 |
|
| 24 | struct hyperx_drvdata {
|
| 25 | struct input_dev *input;
|
| 26 | bool muted;
|
| 27 | bool have_state;
|
| 28 | };
|
| 29 |
|
| 30 | static int hyperx_input_configured(struct hid_device *hdev,
|
| 31 | struct hid_input *hi)
|
| 32 | {
|
| 33 | struct hyperx_drvdata *drvdata = hid_get_drvdata(hdev);
|
| 34 |
|
| 35 | |
| 36 | * The device exposes several application collections. Prefer the
|
| 37 | * telephony one, which already advertises KEY_MICMUTE, and fall back
|
| 38 | * to the first collection otherwise.
|
| 39 |
|
| 40 | if (!drvdata->input || test_bit(KEY_MICMUTE, hi->input->keybit)) {
|
| 41 | drvdata->input = hi->input;
|
| 42 | input_set_capability(drvdata->input, EV_KEY, KEY_MICMUTE);
|
| 43 | }
|
| 44 |
|
| 45 | return 0;
|
| 46 | }
|
| 47 |
|
| 48 | static int hyperx_raw_event(struct hid_device *hdev, struct hid_report *report,
|
| 49 | u8 *data, int size)
|
| 50 | {
|
| 51 | struct hyperx_drvdata *drvdata = hid_get_drvdata(hdev);
|
| 52 | bool muted;
|
| 53 |
|
| 54 | if (!(hdev->claimed & HID_CLAIMED_INPUT) || !drvdata->input)
|
| 55 | return 0;
|
| 56 |
|
| 57 | if (size < HYPERX_QC2_MUTE_LEN || data[0] != HYPERX_QC2_REPORT_ID ||
|
| 58 | data[1] != HYPERX_QC2_EVENT_MUTE)
|
| 59 | return 0;
|
| 60 |
|
| 61 | muted = data[2];
|
| 62 | if (drvdata->have_state && muted == drvdata->muted)
|
| 63 | return 0;
|
| 64 |
|
| 65 | drvdata->muted = muted;
|
| 66 | drvdata->have_state = true;
|
| 67 |
|
| 68 | |
| 69 | * The device reports the resulting absolute state, while KEY_MICMUTE is
|
| 70 | * a momentary key that userspace acts on as a toggle. Emit one
|
| 71 | * keypress per state change.
|
| 72 |
|
| 73 | input_report_key(drvdata->input, KEY_MICMUTE, 1);
|
| 74 | input_sync(drvdata->input);
|
| 75 | input_report_key(drvdata->input, KEY_MICMUTE, 0);
|
| 76 | input_sync(drvdata->input);
|
| 77 |
|
| 78 | return 0;
|
| 79 | }
|
| 80 |
|
| 81 | static int hyperx_probe(struct hid_device *hdev, const struct hid_device_id *id)
|
| 82 | {
|
| 83 | struct hyperx_drvdata *drvdata;
|
| 84 | int ret;
|
| 85 |
|
| 86 | drvdata = devm_kzalloc(&hdev->dev, sizeof(*drvdata), GFP_KERNEL);
|
| 87 | if (!drvdata)
|
| 88 | return -ENOMEM;
|
| 89 |
|
| 90 | hid_set_drvdata(hdev, drvdata);
|
| 91 |
|
| 92 | ret = hid_parse(hdev);
|
| 93 | if (ret)
|
| 94 | return ret;
|
| 95 |
|
| 96 | return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
|
| 97 | }
|
| 98 |
|
| 99 | static const struct hid_device_id hyperx_devices[] = {
|
| 100 | { HID_USB_DEVICE(USB_VENDOR_ID_HP,
|
| 101 | USB_PRODUCT_ID_HP_HYPERX_QUADCAST_2) },
|
| 102 | { }
|
| 103 | };
|
| 104 | MODULE_DEVICE_TABLE(hid, hyperx_devices);
|
| 105 |
|
| 106 | static struct hid_driver hyperx_driver = {
|
| 107 | .name = "hyperx",
|
| 108 | .id_table = hyperx_devices,
|
| 109 | .probe = hyperx_probe,
|
| 110 | .input_configured = hyperx_input_configured,
|
| 111 | .raw_event = hyperx_raw_event,
|
| 112 | };
|
| 113 | module_hid_driver(hyperx_driver);
|
| 114 |
|
| 115 | MODULE_DESCRIPTION("HID driver for the HyperX QuadCast 2 microphone");
|
| 116 | MODULE_AUTHOR("Benjamin Blume <[email protected]>");
|
| 117 | MODULE_LICENSE("GPL");
|