linux/drivers/hid/hid-ortek.c
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   1/*
   2 *  HID driver for various devices which are apparently based on the same chipset
   3 *  from certain vendor which produces chips that contain wrong LogicalMaximum
   4 *  value in their HID report descriptor. Currently supported devices are:
   5 *
   6 *    Ortek PKB-1700
   7 *    Ortek WKB-2000
   8 *    Skycable wireless presenter
   9 *
  10 *  Copyright (c) 2010 Johnathon Harris <jmharris@gmail.com>
  11 *  Copyright (c) 2011 Jiri Kosina
  12 */
  13
  14/*
  15 * This program is free software; you can redistribute it and/or modify it
  16 * under the terms of the GNU General Public License as published by the Free
  17 * Software Foundation; either version 2 of the License, or (at your option)
  18 * any later version.
  19 */
  20
  21#include <linux/device.h>
  22#include <linux/hid.h>
  23#include <linux/module.h>
  24
  25#include "hid-ids.h"
  26
  27static __u8 *ortek_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  28                unsigned int *rsize)
  29{
  30        if (*rsize >= 56 && rdesc[54] == 0x25 && rdesc[55] == 0x01) {
  31                hid_info(hdev, "Fixing up logical minimum in report descriptor (Ortek)\n");
  32                rdesc[55] = 0x92;
  33        } else if (*rsize >= 54 && rdesc[52] == 0x25 && rdesc[53] == 0x01) {
  34                hid_info(hdev, "Fixing up logical minimum in report descriptor (Skycable)\n");
  35                rdesc[53] = 0x65;
  36        }
  37        return rdesc;
  38}
  39
  40static const struct hid_device_id ortek_devices[] = {
  41        { HID_USB_DEVICE(USB_VENDOR_ID_ORTEK, USB_DEVICE_ID_ORTEK_PKB1700) },
  42        { HID_USB_DEVICE(USB_VENDOR_ID_ORTEK, USB_DEVICE_ID_ORTEK_WKB2000) },
  43        { HID_USB_DEVICE(USB_VENDOR_ID_SKYCABLE, USB_DEVICE_ID_SKYCABLE_WIRELESS_PRESENTER) },
  44        { }
  45};
  46MODULE_DEVICE_TABLE(hid, ortek_devices);
  47
  48static struct hid_driver ortek_driver = {
  49        .name = "ortek",
  50        .id_table = ortek_devices,
  51        .report_fixup = ortek_report_fixup
  52};
  53
  54static int __init ortek_init(void)
  55{
  56        return hid_register_driver(&ortek_driver);
  57}
  58
  59static void __exit ortek_exit(void)
  60{
  61        hid_unregister_driver(&ortek_driver);
  62}
  63
  64module_init(ortek_init);
  65module_exit(ortek_exit);
  66MODULE_LICENSE("GPL");
  67
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