drivers/hid/hid-xiaomi.c

   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
  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");