linux/drivers/hid/hid-xinmo.c
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   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 */
  28static 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
  47static 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
  52MODULE_DEVICE_TABLE(hid, xinmo_devices);
  53
  54static struct hid_driver xinmo_driver = {
  55        .name = "xinmo",
  56        .id_table = xinmo_devices,
  57        .event = xinmo_event
  58};
  59
  60module_hid_driver(xinmo_driver);
  61MODULE_LICENSE("GPL");
  62
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