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  */
xinmo_event(struct hid_device * hdev,struct hid_field * field,struct hid_usage * usage,__s32 value)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");
60