drivers/hid/hid-topre.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  *  HID driver for Topre REALFORCE Keyboards
   4  *
   5  *  Copyright (c) 2022 Harry Stern <harry@harrystern.net>
   6  *
   7  *  Based on the hid-macally driver
   8  */
   9
  10 #include <linux/hid.h>
  11 #include <linux/module.h>
  12
  13 #include "hid-ids.h"
  14
  15 MODULE_AUTHOR("Harry Stern <harry@harrystern.net>");
  16 MODULE_DESCRIPTION("REALFORCE R2 Keyboard driver");
  17 MODULE_LICENSE("GPL");
  18
  19 /*
  20  * Fix the REALFORCE R2's non-boot interface's report descriptor to match the
  21  * events it's actually sending. It claims to send array events but is instead
  22  * sending variable events.
  23  */
  24 static const __u8 *topre_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  25                                       unsigned int *rsize)
  26 {
  27         if (*rsize >= 119 && rdesc[69] == 0x29 && rdesc[70] == 0xe7 &&
  28                                                  rdesc[71] == 0x81 && rdesc[72] == 0x00) {
  29                 hid_info(hdev,
  30                         "fixing up Topre REALFORCE keyboard report descriptor\n");
  31                 rdesc[72] = 0x02;
  32         }
  33         return rdesc;
  34 }
  35
  36 static const struct hid_device_id topre_id_table[] = {
  37         { HID_USB_DEVICE(USB_VENDOR_ID_TOPRE,
  38                          USB_DEVICE_ID_TOPRE_REALFORCE_R2_108) },
  39         { HID_USB_DEVICE(USB_VENDOR_ID_TOPRE,
  40                          USB_DEVICE_ID_TOPRE_REALFORCE_R2_87) },
  41         { }
  42 };
  43 MODULE_DEVICE_TABLE(hid, topre_id_table);
  44
  45 static struct hid_driver topre_driver = {
  46         .name                   = "topre",
  47         .id_table               = topre_id_table,
  48         .report_fixup           = topre_report_fixup,
  49 };
  50
  51 module_hid_driver(topre_driver);