Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * HID driver for some huawei "special" devices
4 *
5 * Copyright (c) 2026 Miao Li <limiao@kylinos.cn>
6 */
7
8#include <linux/device.h>
9#include <linux/hid.h>
10#include <linux/module.h>
11#include <linux/usb.h>
12
13#include "hid-ids.h"
14
15static const __u8 huawei_cd30_kbd_rdesc_fixed[] = {
16 0x05, 0x01, /* Usage Page (Generic Desktop) */
17 0x09, 0x80, /* Usage (System Control) */
18 0xa1, 0x01, /* Collection (Application) */
19 0x85, 0x01, /* Report ID (1) */
20 0x19, 0x81, /* Usage Minimum (System Power Down) */
21 0x29, 0x83, /* Usage Maximum (System Wake Up) */
22 0x15, 0x00, /* Logical Minimum (0) */
23 0x25, 0x01, /* Logical Maximum (1) */
24 0x75, 0x01, /* Report Size (1 bit) */
25 0x95, 0x03, /* Report Count (3) */
26 0x81, 0x02, /* Input (Data,Var,Abs) */
27 0x95, 0x05, /* Report Count (5) */
28 0x81, 0x01, /* Input (Cnst,Ary,Abs) */
29 0xc0, /* End Collection */
30 0x05, 0x0c, /* Usage Page (Consumer) */
31 0x09, 0x01, /* Usage (Consumer Control) */
32 0xa1, 0x01, /* Collection (Application) */
33 0x85, 0x02, /* Report ID (2) */
34 0x19, 0x00, /* Usage Minimum (0) */
35 0x2a, 0x3c, 0x02, /* Usage Maximum (0x023C) */
36 0x15, 0x00, /* Logical Minimum (0) */
37 0x26, 0x3c, 0x02, /* Logical Maximum (0x023C) */
38 0x95, 0x01, /* Report Count (1) */
39 0x75, 0x10, /* Report Size (16 bits) */
40 0x81, 0x00, /* Input (Data,Ary,Abs) */
41 0xc0 /* End Collection */
42};
43
44static const __u8 *huawei_report_fixup(struct hid_device *hdev, __u8 *rdesc,
45 unsigned int *rsize)
46{
47 struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
48
49 switch (hdev->product) {
50 case USB_DEVICE_ID_HUAWEI_CD30KBD:
51 if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
52 if (*rsize != sizeof(huawei_cd30_kbd_rdesc_fixed) ||
53 memcmp(huawei_cd30_kbd_rdesc_fixed, rdesc,
54 sizeof(huawei_cd30_kbd_rdesc_fixed)) != 0) {
55 hid_info(hdev, "Replacing Huawei cd30 keyboard report descriptor.\n");
56 *rsize = sizeof(huawei_cd30_kbd_rdesc_fixed);
57 return huawei_cd30_kbd_rdesc_fixed;
58 }
59 }
60 break;
61 }
62
63 return rdesc;
64}
65
66static const struct hid_device_id huawei_devices[] = {
67 /* HUAWEI cd30 keyboard */
68 { HID_USB_DEVICE(USB_VENDOR_ID_HUAWEI, USB_DEVICE_ID_HUAWEI_CD30KBD)},
69 { }
70};
71MODULE_DEVICE_TABLE(hid, huawei_devices);
72
73static struct hid_driver huawei_driver = {
74 .name = "huawei",
75 .id_table = huawei_devices,
76 .report_fixup = huawei_report_fixup,
77};
78module_hid_driver(huawei_driver);
79
80MODULE_LICENSE("GPL");
81MODULE_AUTHOR("Miao Li <limiao@kylinos.cn>");
82MODULE_DESCRIPTION("HID driver for some huawei \"special\" devices");