linux/drivers/hid/hid-saitek.c
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   1/*
   2 *  HID driver for Saitek devices, currently only the PS1000 (USB gamepad).
   3 *  Fixes the HID report descriptor by removing a non-existent axis and
   4 *  clearing the constant bit on the input reports for buttons and d-pad.
   5 *  (This module is based on "hid-ortek".)
   6 *
   7 *  Copyright (c) 2012 Andreas Hübner
   8 */
   9
  10/*
  11 * This program is free software; you can redistribute it and/or modify it
  12 * under the terms of the GNU General Public License as published by the Free
  13 * Software Foundation; either version 2 of the License, or (at your option)
  14 * any later version.
  15 */
  16
  17#include <linux/device.h>
  18#include <linux/hid.h>
  19#include <linux/module.h>
  20#include <linux/kernel.h>
  21
  22#include "hid-ids.h"
  23
  24static __u8 *saitek_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  25                unsigned int *rsize)
  26{
  27        if (*rsize == 137 && rdesc[20] == 0x09 && rdesc[21] == 0x33
  28                        && rdesc[94] == 0x81 && rdesc[95] == 0x03
  29                        && rdesc[110] == 0x81 && rdesc[111] == 0x03) {
  30
  31                hid_info(hdev, "Fixing up Saitek PS1000 report descriptor\n");
  32
  33                /* convert spurious axis to a "noop" Logical Minimum (0) */
  34                rdesc[20] = 0x15;
  35                rdesc[21] = 0x00;
  36
  37                /* clear constant bit on buttons and d-pad */
  38                rdesc[95] = 0x02;
  39                rdesc[111] = 0x02;
  40
  41        }
  42        return rdesc;
  43}
  44
  45static const struct hid_device_id saitek_devices[] = {
  46        { HID_USB_DEVICE(USB_VENDOR_ID_SAITEK, USB_DEVICE_ID_SAITEK_PS1000)},
  47        { }
  48};
  49
  50MODULE_DEVICE_TABLE(hid, saitek_devices);
  51
  52static struct hid_driver saitek_driver = {
  53        .name = "saitek",
  54        .id_table = saitek_devices,
  55        .report_fixup = saitek_report_fixup
  56};
  57
  58static int __init saitek_init(void)
  59{
  60        return hid_register_driver(&saitek_driver);
  61}
  62
  63static void __exit saitek_exit(void)
  64{
  65        hid_unregister_driver(&saitek_driver);
  66}
  67
  68module_init(saitek_init);
  69module_exit(saitek_exit);
  70MODULE_LICENSE("GPL");
  71
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