1*e93faacaSMiao Li // SPDX-License-Identifier: GPL-2.0 2*e93faacaSMiao Li /* 3*e93faacaSMiao Li * HID driver for some huawei "special" devices 4*e93faacaSMiao Li * 5*e93faacaSMiao Li * Copyright (c) 2026 Miao Li <limiao@kylinos.cn> 6*e93faacaSMiao Li */ 7*e93faacaSMiao Li 8*e93faacaSMiao Li #include <linux/device.h> 9*e93faacaSMiao Li #include <linux/hid.h> 10*e93faacaSMiao Li #include <linux/module.h> 11*e93faacaSMiao Li #include <linux/usb.h> 12*e93faacaSMiao Li 13*e93faacaSMiao Li #include "hid-ids.h" 14*e93faacaSMiao Li 15*e93faacaSMiao Li static const __u8 huawei_cd30_kbd_rdesc_fixed[] = { 16*e93faacaSMiao Li 0x05, 0x01, /* Usage Page (Generic Desktop) */ 17*e93faacaSMiao Li 0x09, 0x80, /* Usage (System Control) */ 18*e93faacaSMiao Li 0xa1, 0x01, /* Collection (Application) */ 19*e93faacaSMiao Li 0x85, 0x01, /* Report ID (1) */ 20*e93faacaSMiao Li 0x19, 0x81, /* Usage Minimum (System Power Down) */ 21*e93faacaSMiao Li 0x29, 0x83, /* Usage Maximum (System Wake Up) */ 22*e93faacaSMiao Li 0x15, 0x00, /* Logical Minimum (0) */ 23*e93faacaSMiao Li 0x25, 0x01, /* Logical Maximum (1) */ 24*e93faacaSMiao Li 0x75, 0x01, /* Report Size (1 bit) */ 25*e93faacaSMiao Li 0x95, 0x03, /* Report Count (3) */ 26*e93faacaSMiao Li 0x81, 0x02, /* Input (Data,Var,Abs) */ 27*e93faacaSMiao Li 0x95, 0x05, /* Report Count (5) */ 28*e93faacaSMiao Li 0x81, 0x01, /* Input (Cnst,Ary,Abs) */ 29*e93faacaSMiao Li 0xc0, /* End Collection */ 30*e93faacaSMiao Li 0x05, 0x0c, /* Usage Page (Consumer) */ 31*e93faacaSMiao Li 0x09, 0x01, /* Usage (Consumer Control) */ 32*e93faacaSMiao Li 0xa1, 0x01, /* Collection (Application) */ 33*e93faacaSMiao Li 0x85, 0x02, /* Report ID (2) */ 34*e93faacaSMiao Li 0x19, 0x00, /* Usage Minimum (0) */ 35*e93faacaSMiao Li 0x2a, 0x3c, 0x02, /* Usage Maximum (0x023C) */ 36*e93faacaSMiao Li 0x15, 0x00, /* Logical Minimum (0) */ 37*e93faacaSMiao Li 0x26, 0x3c, 0x02, /* Logical Maximum (0x023C) */ 38*e93faacaSMiao Li 0x95, 0x01, /* Report Count (1) */ 39*e93faacaSMiao Li 0x75, 0x10, /* Report Size (16 bits) */ 40*e93faacaSMiao Li 0x81, 0x00, /* Input (Data,Ary,Abs) */ 41*e93faacaSMiao Li 0xc0 /* End Collection */ 42*e93faacaSMiao Li }; 43*e93faacaSMiao Li 44*e93faacaSMiao Li static const __u8 *huawei_report_fixup(struct hid_device *hdev, __u8 *rdesc, 45*e93faacaSMiao Li unsigned int *rsize) 46*e93faacaSMiao Li { 47*e93faacaSMiao Li struct usb_interface *intf = to_usb_interface(hdev->dev.parent); 48*e93faacaSMiao Li 49*e93faacaSMiao Li switch (hdev->product) { 50*e93faacaSMiao Li case USB_DEVICE_ID_HUAWEI_CD30KBD: 51*e93faacaSMiao Li if (intf->cur_altsetting->desc.bInterfaceNumber == 1) { 52*e93faacaSMiao Li if (*rsize != sizeof(huawei_cd30_kbd_rdesc_fixed) || 53*e93faacaSMiao Li memcmp(huawei_cd30_kbd_rdesc_fixed, rdesc, 54*e93faacaSMiao Li sizeof(huawei_cd30_kbd_rdesc_fixed)) != 0) { 55*e93faacaSMiao Li hid_info(hdev, "Replacing Huawei cd30 keyboard report descriptor.\n"); 56*e93faacaSMiao Li *rsize = sizeof(huawei_cd30_kbd_rdesc_fixed); 57*e93faacaSMiao Li return huawei_cd30_kbd_rdesc_fixed; 58*e93faacaSMiao Li } 59*e93faacaSMiao Li } 60*e93faacaSMiao Li break; 61*e93faacaSMiao Li } 62*e93faacaSMiao Li 63*e93faacaSMiao Li return rdesc; 64*e93faacaSMiao Li } 65*e93faacaSMiao Li 66*e93faacaSMiao Li static const struct hid_device_id huawei_devices[] = { 67*e93faacaSMiao Li /* HUAWEI cd30 keyboard */ 68*e93faacaSMiao Li { HID_USB_DEVICE(USB_VENDOR_ID_HUAWEI, USB_DEVICE_ID_HUAWEI_CD30KBD)}, 69*e93faacaSMiao Li { } 70*e93faacaSMiao Li }; 71*e93faacaSMiao Li MODULE_DEVICE_TABLE(hid, huawei_devices); 72*e93faacaSMiao Li 73*e93faacaSMiao Li static struct hid_driver huawei_driver = { 74*e93faacaSMiao Li .name = "huawei", 75*e93faacaSMiao Li .id_table = huawei_devices, 76*e93faacaSMiao Li .report_fixup = huawei_report_fixup, 77*e93faacaSMiao Li }; 78*e93faacaSMiao Li module_hid_driver(huawei_driver); 79*e93faacaSMiao Li 80*e93faacaSMiao Li MODULE_LICENSE("GPL"); 81*e93faacaSMiao Li MODULE_AUTHOR("Miao Li <limiao@kylinos.cn>"); 82*e93faacaSMiao Li MODULE_DESCRIPTION("HID driver for some huawei \"special\" devices"); 83