xref: /openbmc/linux/drivers/hid/hid-xiaomi.c (revision 95157723)
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
17 static __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 
xiaomi_report_fixup(struct hid_device * hdev,__u8 * rdesc,unsigned int * rsize)64 static __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 
79 static const struct hid_device_id xiaomi_devices[] = {
80 	{ HID_BLUETOOTH_DEVICE(USB_VENDOR_ID_XIAOMI, USB_DEVICE_ID_MI_SILENT_MOUSE) },
81 	{ }
82 };
83 MODULE_DEVICE_TABLE(hid, xiaomi_devices);
84 
85 static struct hid_driver xiaomi_driver = {
86 	.name = "xiaomi",
87 	.id_table = xiaomi_devices,
88 	.report_fixup = xiaomi_report_fixup,
89 };
90 module_hid_driver(xiaomi_driver);
91 
92 MODULE_LICENSE("GPL");
93 MODULE_AUTHOR("Ilya Skriblovsky <IlyaSkriblovsky@gmail.com>");
94 MODULE_DESCRIPTION("Fixing side buttons of Xiaomi Mi Silent Mouse");
95