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// SPDX-License-Identifier: GPL-2.0
/*
* HID driver for some huawei "special" devices
*
* Copyright (c) 2026 Miao Li <limiao@kylinos.cn>
*/
#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/usb.h>
#include "hid-ids.h"
static const __u8 huawei_cd30_kbd_rdesc_fixed[] = {
0x05, 0x01, /* Usage Page (Generic Desktop) */
0x09, 0x80, /* Usage (System Control) */
0xa1, 0x01, /* Collection (Application) */
0x85, 0x01, /* Report ID (1) */
0x19, 0x81, /* Usage Minimum (System Power Down) */
0x29, 0x83, /* Usage Maximum (System Wake Up) */
0x15, 0x00, /* Logical Minimum (0) */
0x25, 0x01, /* Logical Maximum (1) */
0x75, 0x01, /* Report Size (1 bit) */
0x95, 0x03, /* Report Count (3) */
0x81, 0x02, /* Input (Data,Var,Abs) */
0x95, 0x05, /* Report Count (5) */
0x81, 0x01, /* Input (Cnst,Ary,Abs) */
0xc0, /* End Collection */
0x05, 0x0c, /* Usage Page (Consumer) */
0x09, 0x01, /* Usage (Consumer Control) */
0xa1, 0x01, /* Collection (Application) */
0x85, 0x02, /* Report ID (2) */
0x19, 0x00, /* Usage Minimum (0) */
0x2a, 0x3c, 0x02, /* Usage Maximum (0x023C) */
0x15, 0x00, /* Logical Minimum (0) */
0x26, 0x3c, 0x02, /* Logical Maximum (0x023C) */
0x95, 0x01, /* Report Count (1) */
0x75, 0x10, /* Report Size (16 bits) */
0x81, 0x00, /* Input (Data,Ary,Abs) */
0xc0 /* End Collection */
};
static const __u8 *huawei_report_fixup(struct hid_device *hdev, __u8 *rdesc,
unsigned int *rsize)
{
struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
switch (hdev->product) {
case USB_DEVICE_ID_HUAWEI_CD30KBD:
if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
if (*rsize != sizeof(huawei_cd30_kbd_rdesc_fixed) ||
memcmp(huawei_cd30_kbd_rdesc_fixed, rdesc,
sizeof(huawei_cd30_kbd_rdesc_fixed)) != 0) {
hid_info(hdev, "Replacing Huawei cd30 keyboard report descriptor.\n");
*rsize = sizeof(huawei_cd30_kbd_rdesc_fixed);
return huawei_cd30_kbd_rdesc_fixed;
}
}
break;
}
return rdesc;
}
static const struct hid_device_id huawei_devices[] = {
/* HUAWEI cd30 keyboard */
{ HID_USB_DEVICE(USB_VENDOR_ID_HUAWEI, USB_DEVICE_ID_HUAWEI_CD30KBD)},
{ }
};
MODULE_DEVICE_TABLE(hid, huawei_devices);
static struct hid_driver huawei_driver = {
.name = "huawei",
.id_table = huawei_devices,
.report_fixup = huawei_report_fixup,
};
module_hid_driver(huawei_driver);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Miao Li <limiao@kylinos.cn>");
MODULE_DESCRIPTION("HID driver for some huawei \"special\" devices");
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