1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *  Force feedback support for Betop based devices
4 *
5 *  The devices are distributed under various names and the same USB device ID
6 *  can be used in both adapters and actual game controllers.
7 *
8 *  0x11c2:0x2208 "BTP2185 BFM mode Joystick"
9 *   - tested with BTP2185 BFM Mode.
10 *
11 *  0x11C0:0x5506 "BTP2185 PC mode Joystick"
12 *   - tested with BTP2185 PC Mode.
13 *
14 *  0x8380:0x1850 "BTP2185 V2 PC mode USB Gamepad"
15 *   - tested with BTP2185 PC Mode with another version.
16 *
17 *  0x20bc:0x5500 "BTP2185 V2 BFM mode Joystick"
18 *   - tested with BTP2171s.
19 *  Copyright (c) 2014 Huang Bo <huangbobupt@163.com>
20 */
21
22/*
23 */
24
25
26#include <linux/input.h>
27#include <linux/slab.h>
28#include <linux/module.h>
29#include <linux/hid.h>
30
31#include "hid-ids.h"
32
33struct betopff_device {
34	struct hid_report *report;
35};
36
37static int hid_betopff_play(struct input_dev *dev, void *data,
38			 struct ff_effect *effect)
39{
40	struct hid_device *hid = input_get_drvdata(dev);
41	struct betopff_device *betopff = data;
42	__u16 left, right;
43
44	left = effect->u.rumble.strong_magnitude;
45	right = effect->u.rumble.weak_magnitude;
46
47	betopff->report->field[2]->value[0] = left / 256;
48	betopff->report->field[3]->value[0] = right / 256;
49
50	hid_hw_request(hid, betopff->report, HID_REQ_SET_REPORT);
51
52	return 0;
53}
54
55static int betopff_init(struct hid_device *hid)
56{
57	struct betopff_device *betopff;
58	struct hid_report *report;
59	struct hid_input *hidinput;
60	struct list_head *report_list =
61			&hid->report_enum[HID_OUTPUT_REPORT].report_list;
62	struct input_dev *dev;
63	int error;
64	int i, j;
65
66	if (list_empty(&hid->inputs)) {
67		hid_err(hid, "no inputs found\n");
68		return -ENODEV;
69	}
70
71	hidinput = list_first_entry(&hid->inputs, struct hid_input, list);
72	dev = hidinput->input;
73
74	if (list_empty(report_list)) {
75		hid_err(hid, "no output reports found\n");
76		return -ENODEV;
77	}
78
79	report = list_first_entry(report_list, struct hid_report, list);
80	/*
81	 * Actually there are 4 fields for 4 Bytes as below:
82	 * -----------------------------------------
83	 * Byte0  Byte1  Byte2	  Byte3
84	 * 0x00   0x00   left_motor right_motor
85	 * -----------------------------------------
86	 * Do init them with default value.
87	 */
88	if (report->maxfield < 4) {
89		hid_err(hid, "not enough fields in the report: %d\n",
90				report->maxfield);
91		return -ENODEV;
92	}
93	for (i = 0; i < report->maxfield; i++) {
94		if (report->field[i]->report_count < 1) {
95			hid_err(hid, "no values in the field\n");
96			return -ENODEV;
97		}
98		for (j = 0; j < report->field[i]->report_count; j++) {
99			report->field[i]->value[j] = 0x00;
100		}
101	}
102
103	betopff = kzalloc(sizeof(*betopff), GFP_KERNEL);
104	if (!betopff)
105		return -ENOMEM;
106
107	set_bit(FF_RUMBLE, dev->ffbit);
108
109	error = input_ff_create_memless(dev, betopff, hid_betopff_play);
110	if (error) {
111		kfree(betopff);
112		return error;
113	}
114
115	betopff->report = report;
116	hid_hw_request(hid, betopff->report, HID_REQ_SET_REPORT);
117
118	hid_info(hid, "Force feedback for betop devices by huangbo <huangbobupt@163.com>\n");
119
120	return 0;
121}
122
123static int betop_probe(struct hid_device *hdev, const struct hid_device_id *id)
124{
125	int ret;
126
127	if (id->driver_data)
128		hdev->quirks |= HID_QUIRK_MULTI_INPUT;
129
130	ret = hid_parse(hdev);
131	if (ret) {
132		hid_err(hdev, "parse failed\n");
133		goto err;
134	}
135
136	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
137	if (ret) {
138		hid_err(hdev, "hw start failed\n");
139		goto err;
140	}
141
142	betopff_init(hdev);
143
144	return 0;
145err:
146	return ret;
147}
148
149static const struct hid_device_id betop_devices[] = {
150	{ HID_USB_DEVICE(USB_VENDOR_ID_BETOP_2185BFM, 0x2208) },
151	{ HID_USB_DEVICE(USB_VENDOR_ID_BETOP_2185PC, 0x5506) },
152	{ HID_USB_DEVICE(USB_VENDOR_ID_BETOP_2185V2PC, 0x1850) },
153	{ HID_USB_DEVICE(USB_VENDOR_ID_BETOP_2185V2BFM, 0x5500) },
154	{ }
155};
156MODULE_DEVICE_TABLE(hid, betop_devices);
157
158static struct hid_driver betop_driver = {
159	.name = "betop",
160	.id_table = betop_devices,
161	.probe = betop_probe,
162};
163module_hid_driver(betop_driver);
164
165MODULE_LICENSE("GPL");
166