drivers/hid/hid-xinmo.c

   1 /*
   2  *  HID driver for Xin-Mo devices, currently only the Dual Arcade controller.
   3  *  Fixes the negative axis event values (the devices sends -2) to match the
   4  *  logical axis minimum of the HID report descriptor (the report announces
   5  *  -1). It is needed because hid-input discards out of bounds values.
   6  *  (This module is based on "hid-saitek" and "hid-lg".)
   7  *
   8  *  Copyright (c) 2013 Olivier Scherler
   9  */
  10
  11 /*
  12  * This program is free software; you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License as published by the Free
  14  * Software Foundation; either version 2 of the License, or (at your option)
  15  * any later version.
  16  */
  17
  18 #include <linux/device.h>
  19 #include <linux/hid.h>
  20 #include <linux/module.h>
  21 #include <linux/kernel.h>
  22
  23 #include "hid-ids.h"
  24
  25 /*
  26  * Fix negative events that are out of bounds.
  27  */
  28 static int xinmo_event(struct hid_device *hdev, struct hid_field *field,
  29                 struct hid_usage *usage, __s32 value)
  30 {
  31         switch (usage->code) {
  32         case ABS_X:
  33         case ABS_Y:
  34         case ABS_Z:
  35         case ABS_RX:
  36                 if (value < -1) {
  37                         input_event(field->hidinput->input, usage->type,
  38                                 usage->code, -1);
  39                         return 1;
  40                 }
  41                 break;
  42         }
  43
  44         return 0;
  45 }
  46
  47 static const struct hid_device_id xinmo_devices[] = {
  48         { HID_USB_DEVICE(USB_VENDOR_ID_XIN_MO, USB_DEVICE_ID_XIN_MO_DUAL_ARCADE) },
  49         { }
  50 };
  51
  52 MODULE_DEVICE_TABLE(hid, xinmo_devices);
  53
  54 static struct hid_driver xinmo_driver = {
  55         .name = "xinmo",
  56         .id_table = xinmo_devices,
  57         .event = xinmo_event
  58 };
  59
  60 module_hid_driver(xinmo_driver);
  61 MODULE_LICENSE("GPL");