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Linux/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 module_hid_driver(saitek_driver);
 58 
 59 MODULE_LICENSE("GPL");
 60 

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