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 15 static 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 44 static const __u8 *huawei_report_fixup(struct hid_device *hdev, __u8 *rdesc, 45 unsigned int *rsize) 46 { 47 struct usb_interface *intf = hid_is_usb(hdev) ? 48 to_usb_interface(hdev->dev.parent) : NULL; 49 50 switch (hdev->product) { 51 case USB_DEVICE_ID_HUAWEI_CD30KBD: 52 if (!intf || intf->cur_altsetting->desc.bInterfaceNumber == 1) { 53 if (*rsize != sizeof(huawei_cd30_kbd_rdesc_fixed) || 54 memcmp(huawei_cd30_kbd_rdesc_fixed, rdesc, 55 sizeof(huawei_cd30_kbd_rdesc_fixed)) != 0) { 56 hid_info(hdev, "Replacing Huawei cd30 keyboard report descriptor.\n"); 57 *rsize = sizeof(huawei_cd30_kbd_rdesc_fixed); 58 return huawei_cd30_kbd_rdesc_fixed; 59 } 60 } 61 break; 62 } 63 64 return rdesc; 65 } 66 67 static const struct hid_device_id huawei_devices[] = { 68 /* HUAWEI cd30 keyboard */ 69 { HID_USB_DEVICE(USB_VENDOR_ID_HUAWEI, USB_DEVICE_ID_HUAWEI_CD30KBD)}, 70 { } 71 }; 72 MODULE_DEVICE_TABLE(hid, huawei_devices); 73 74 static struct hid_driver huawei_driver = { 75 .name = "huawei", 76 .id_table = huawei_devices, 77 .report_fixup = huawei_report_fixup, 78 }; 79 module_hid_driver(huawei_driver); 80 81 MODULE_LICENSE("GPL"); 82 MODULE_AUTHOR("Miao Li <limiao@kylinos.cn>"); 83 MODULE_DESCRIPTION("HID driver for some huawei \"special\" devices"); 84