root/drivers/hid/hid-xinmo.c

DEFINITIONS

1. xinmo_event

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  HID driver for Xin-Mo devices, currently only the Dual Arcade controller.
   4  *  Fixes the negative axis event values (the devices sends -2) to match the
   5  *  logical axis minimum of the HID report descriptor (the report announces
   6  *  -1). It is needed because hid-input discards out of bounds values.
   7  *  (This module is based on "hid-saitek" and "hid-lg".)
   8  *
   9  *  Copyright (c) 2013 Olivier Scherler
  10  */
  11 
  12 /*
  13  */
  14 
  15 #include <linux/device.h>
  16 #include <linux/hid.h>
  17 #include <linux/module.h>
  18 #include <linux/kernel.h>
  19 
  20 #include "hid-ids.h"
  21 
  22 /*
  23  * Fix negative events that are out of bounds.
  24  */
  25 static int xinmo_event(struct hid_device *hdev, struct hid_field *field,
  26                 struct hid_usage *usage, __s32 value)
  27 {
  28         switch (usage->code) {
  29         case ABS_X:
  30         case ABS_Y:
  31         case ABS_Z:
  32         case ABS_RX:
  33                 if (value < -1) {
  34                         input_event(field->hidinput->input, usage->type,
  35                                 usage->code, -1);
  36                         return 1;
  37                 }
  38                 break;
  39         }
  40 
  41         return 0;
  42 }
  43 
  44 static const struct hid_device_id xinmo_devices[] = {
  45         { HID_USB_DEVICE(USB_VENDOR_ID_XIN_MO, USB_DEVICE_ID_XIN_MO_DUAL_ARCADE) },
  46         { HID_USB_DEVICE(USB_VENDOR_ID_XIN_MO, USB_DEVICE_ID_THT_2P_ARCADE) },
  47         { }
  48 };
  49 
  50 MODULE_DEVICE_TABLE(hid, xinmo_devices);
  51 
  52 static struct hid_driver xinmo_driver = {
  53         .name = "xinmo",
  54         .id_table = xinmo_devices,
  55         .event = xinmo_event
  56 };
  57 
  58 module_hid_driver(xinmo_driver);
  59 MODULE_LICENSE("GPL");