Line data    Source code

       1             : /*
       2             :  *  HID driver for Redragon keyboards
       3             :  *
       4             :  *  Copyright (c) 2017 Robert Munteanu
       5             :  *  SPDX-License-Identifier: GPL-2.0+
       6             :  */
       7             : 
       8             : /*
       9             :  * This program is free software; you can redistribute it and/or modify it
      10             :  * under the terms of the GNU General Public License as published by the Free
      11             :  * Software Foundation; either version 2 of the License, or (at your option)
      12             :  * any later version.
      13             :  */
      14             : 
      15             : #include <linux/device.h>
      16             : #include <linux/hid.h>
      17             : #include <linux/module.h>
      18             : 
      19             : #include "hid-ids.h"
      20             : 
      21             : 
      22             : /*
      23             :  * The Redragon Asura keyboard sends an incorrect HID descriptor.
      24             :  * At byte 100 it contains
      25             :  *
      26             :  *   0x81, 0x00
      27             :  *
      28             :  * which is Input (Data, Arr, Abs), but it should be
      29             :  *
      30             :  *   0x81, 0x02
      31             :  *
      32             :  * which is Input (Data, Var, Abs), which is consistent with the way
      33             :  * key codes are generated.
      34             :  */
      35             : 
      36           0 : static __u8 *redragon_report_fixup(struct hid_device *hdev, __u8 *rdesc,
      37             :         unsigned int *rsize)
      38             : {
      39           0 :         if (*rsize >= 102 && rdesc[100] == 0x81 && rdesc[101] == 0x00) {
      40           0 :                 dev_info(&hdev->dev, "Fixing Redragon ASURA report descriptor.\n");
      41           0 :                 rdesc[101] = 0x02;
      42             :         }
      43             : 
      44           0 :         return rdesc;
      45             : }
      46             : 
      47             : static const struct hid_device_id redragon_devices[] = {
      48             :         {HID_USB_DEVICE(USB_VENDOR_ID_JESS, USB_DEVICE_ID_REDRAGON_ASURA)},
      49             :         {}
      50             : };
      51             : 
      52             : MODULE_DEVICE_TABLE(hid, redragon_devices);
      53             : 
      54             : static struct hid_driver redragon_driver = {
      55             :         .name = "redragon",
      56             :         .id_table = redragon_devices,
      57             :         .report_fixup = redragon_report_fixup
      58             : };
      59             : 
      60           1 : module_hid_driver(redragon_driver);
      61             : 
      62             : MODULE_LICENSE("GPL");