1// SPDX-License-Identifier: GPL-2.0
2/*
3 * HID driver for Xiaomi Mi Dual Mode Wireless Mouse Silent Edition
4 *
5 * Copyright (c) 2021 Ilya Skriblovsky
6 */
7
8#include <linux/init.h>
9#include <linux/module.h>
10#include <linux/hid.h>
11
12#include "hid-ids.h"
13
14/* Fixed Mi Silent Mouse report descriptor */
15/* Button's Usage Maximum changed from 3 to 5 to make side buttons work */
16#define MI_SILENT_MOUSE_ORIG_RDESC_LENGTH 87
17static __u8 mi_silent_mouse_rdesc_fixed[] = {
18 0x05, 0x01, /* Usage Page (Desktop), */
19 0x09, 0x02, /* Usage (Mouse), */
20 0xA1, 0x01, /* Collection (Application), */
21 0x85, 0x03, /* Report ID (3), */
22 0x09, 0x01, /* Usage (Pointer), */
23 0xA1, 0x00, /* Collection (Physical), */
24 0x05, 0x09, /* Usage Page (Button), */
25 0x19, 0x01, /* Usage Minimum (01h), */
26 0x29, 0x05, /* X */ /* Usage Maximum (05h), */
27 0x15, 0x00, /* Logical Minimum (0), */
28 0x25, 0x01, /* Logical Maximum (1), */
29 0x75, 0x01, /* Report Size (1), */
30 0x95, 0x05, /* Report Count (5), */
31 0x81, 0x02, /* Input (Variable), */
32 0x75, 0x03, /* Report Size (3), */
33 0x95, 0x01, /* Report Count (1), */
34 0x81, 0x01, /* Input (Constant), */
35 0x05, 0x01, /* Usage Page (Desktop), */
36 0x09, 0x30, /* Usage (X), */
37 0x09, 0x31, /* Usage (Y), */
38 0x15, 0x81, /* Logical Minimum (-127), */
39 0x25, 0x7F, /* Logical Maximum (127), */
40 0x75, 0x08, /* Report Size (8), */
41 0x95, 0x02, /* Report Count (2), */
42 0x81, 0x06, /* Input (Variable, Relative), */
43 0x09, 0x38, /* Usage (Wheel), */
44 0x15, 0x81, /* Logical Minimum (-127), */
45 0x25, 0x7F, /* Logical Maximum (127), */
46 0x75, 0x08, /* Report Size (8), */
47 0x95, 0x01, /* Report Count (1), */
48 0x81, 0x06, /* Input (Variable, Relative), */
49 0xC0, /* End Collection, */
50 0xC0, /* End Collection, */
51 0x06, 0x01, 0xFF, /* Usage Page (FF01h), */
52 0x09, 0x01, /* Usage (01h), */
53 0xA1, 0x01, /* Collection (Application), */
54 0x85, 0x05, /* Report ID (5), */
55 0x09, 0x05, /* Usage (05h), */
56 0x15, 0x00, /* Logical Minimum (0), */
57 0x26, 0xFF, 0x00, /* Logical Maximum (255), */
58 0x75, 0x08, /* Report Size (8), */
59 0x95, 0x04, /* Report Count (4), */
60 0xB1, 0x02, /* Feature (Variable), */
61 0xC0 /* End Collection */
62};
63
64static __u8 *xiaomi_report_fixup(struct hid_device *hdev, __u8 *rdesc,
65 unsigned int *rsize)
66{
67 switch (hdev->product) {
68 case USB_DEVICE_ID_MI_SILENT_MOUSE:
69 if (*rsize == MI_SILENT_MOUSE_ORIG_RDESC_LENGTH) {
70 hid_info(hdev, "fixing up Mi Silent Mouse report descriptor\n");
71 rdesc = mi_silent_mouse_rdesc_fixed;
72 *rsize = sizeof(mi_silent_mouse_rdesc_fixed);
73 }
74 break;
75 }
76 return rdesc;
77}
78
79static const struct hid_device_id xiaomi_devices[] = {
80 { HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_XIAOMI, USB_DEVICE_ID_MI_SILENT_MOUSE) },
81 { }
82};
83MODULE_DEVICE_TABLE(hid, xiaomi_devices);
84
85static struct hid_driver xiaomi_driver = {
86 .name = "xiaomi",
87 .id_table = xiaomi_devices,
88 .report_fixup = xiaomi_report_fixup,
89};
90module_hid_driver(xiaomi_driver);
91
92MODULE_LICENSE("GPL");
93MODULE_AUTHOR("Ilya Skriblovsky <IlyaSkriblovsky@gmail.com>");
94MODULE_DESCRIPTION("Fixing side buttons of Xiaomi Mi Silent Mouse");
95

source code of linux/drivers/hid/hid-xiaomi.c