drivers/hid/hid-saitek.c

   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
  24 static __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
  45 static const struct hid_device_id saitek_devices[] = {
  46         { HID_USB_DEVICE(USB_VENDOR_ID_SAITEK, USB_DEVICE_ID_SAITEK_PS1000)},
  47         { }
  48 };
  49
  50 MODULE_DEVICE_TABLE(hid, saitek_devices);
  51
  52 static struct hid_driver saitek_driver = {
  53         .name = "saitek",
  54         .id_table = saitek_devices,
  55         .report_fixup = saitek_report_fixup
  56 };
  57
  58 static int __init saitek_init(void)
  59 {
  60         return hid_register_driver(&saitek_driver);
  61 }
  62
  63 static void __exit saitek_exit(void)
  64 {
  65         hid_unregister_driver(&saitek_driver);
  66 }
  67
  68 module_init(saitek_init);
  69 module_exit(saitek_exit);
  70 MODULE_LICENSE("GPL");