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Linux/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");
 62 

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