1*06be0d64Sfrank zago // SPDX-License-Identifier: GPL-2.0-or-later
2*06be0d64Sfrank zago /*
3*06be0d64Sfrank zago * Vibration support for Mega World controllers
4*06be0d64Sfrank zago *
5*06be0d64Sfrank zago * Copyright 2022 Frank Zago
6*06be0d64Sfrank zago *
7*06be0d64Sfrank zago * Derived from hid-zpff.c:
8*06be0d64Sfrank zago * Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com>
9*06be0d64Sfrank zago */
10*06be0d64Sfrank zago
11*06be0d64Sfrank zago #include <linux/hid.h>
12*06be0d64Sfrank zago #include <linux/input.h>
13*06be0d64Sfrank zago #include <linux/module.h>
14*06be0d64Sfrank zago #include <linux/slab.h>
15*06be0d64Sfrank zago
16*06be0d64Sfrank zago #include "hid-ids.h"
17*06be0d64Sfrank zago
18*06be0d64Sfrank zago struct mwctrl_device {
19*06be0d64Sfrank zago struct hid_report *report;
20*06be0d64Sfrank zago s32 *weak;
21*06be0d64Sfrank zago s32 *strong;
22*06be0d64Sfrank zago };
23*06be0d64Sfrank zago
mwctrl_play(struct input_dev * dev,void * data,struct ff_effect * effect)24*06be0d64Sfrank zago static int mwctrl_play(struct input_dev *dev, void *data,
25*06be0d64Sfrank zago struct ff_effect *effect)
26*06be0d64Sfrank zago {
27*06be0d64Sfrank zago struct hid_device *hid = input_get_drvdata(dev);
28*06be0d64Sfrank zago struct mwctrl_device *mwctrl = data;
29*06be0d64Sfrank zago
30*06be0d64Sfrank zago *mwctrl->strong = effect->u.rumble.strong_magnitude >> 8;
31*06be0d64Sfrank zago *mwctrl->weak = effect->u.rumble.weak_magnitude >> 8;
32*06be0d64Sfrank zago
33*06be0d64Sfrank zago hid_hw_request(hid, mwctrl->report, HID_REQ_SET_REPORT);
34*06be0d64Sfrank zago
35*06be0d64Sfrank zago return 0;
36*06be0d64Sfrank zago }
37*06be0d64Sfrank zago
mwctrl_init(struct hid_device * hid)38*06be0d64Sfrank zago static int mwctrl_init(struct hid_device *hid)
39*06be0d64Sfrank zago {
40*06be0d64Sfrank zago struct mwctrl_device *mwctrl;
41*06be0d64Sfrank zago struct hid_report *report;
42*06be0d64Sfrank zago struct hid_input *hidinput;
43*06be0d64Sfrank zago struct input_dev *dev;
44*06be0d64Sfrank zago int error;
45*06be0d64Sfrank zago int i;
46*06be0d64Sfrank zago
47*06be0d64Sfrank zago if (list_empty(&hid->inputs)) {
48*06be0d64Sfrank zago hid_err(hid, "no inputs found\n");
49*06be0d64Sfrank zago return -ENODEV;
50*06be0d64Sfrank zago }
51*06be0d64Sfrank zago hidinput = list_entry(hid->inputs.next, struct hid_input, list);
52*06be0d64Sfrank zago dev = hidinput->input;
53*06be0d64Sfrank zago
54*06be0d64Sfrank zago for (i = 0; i < 4; i++) {
55*06be0d64Sfrank zago report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, i, 1);
56*06be0d64Sfrank zago if (!report)
57*06be0d64Sfrank zago return -ENODEV;
58*06be0d64Sfrank zago }
59*06be0d64Sfrank zago
60*06be0d64Sfrank zago mwctrl = kzalloc(sizeof(struct mwctrl_device), GFP_KERNEL);
61*06be0d64Sfrank zago if (!mwctrl)
62*06be0d64Sfrank zago return -ENOMEM;
63*06be0d64Sfrank zago
64*06be0d64Sfrank zago set_bit(FF_RUMBLE, dev->ffbit);
65*06be0d64Sfrank zago
66*06be0d64Sfrank zago error = input_ff_create_memless(dev, mwctrl, mwctrl_play);
67*06be0d64Sfrank zago if (error) {
68*06be0d64Sfrank zago kfree(mwctrl);
69*06be0d64Sfrank zago return error;
70*06be0d64Sfrank zago }
71*06be0d64Sfrank zago
72*06be0d64Sfrank zago mwctrl->report = report;
73*06be0d64Sfrank zago
74*06be0d64Sfrank zago /* Field 0 is always 2, and field 1 is always 0. The original
75*06be0d64Sfrank zago * windows driver has a 5 bytes command, where the 5th byte is
76*06be0d64Sfrank zago * a repeat of the 3rd byte, however the device has only 4
77*06be0d64Sfrank zago * fields. It could be a bug in the driver, or there is a
78*06be0d64Sfrank zago * different device that needs it.
79*06be0d64Sfrank zago */
80*06be0d64Sfrank zago report->field[0]->value[0] = 0x02;
81*06be0d64Sfrank zago
82*06be0d64Sfrank zago mwctrl->strong = &report->field[2]->value[0];
83*06be0d64Sfrank zago mwctrl->weak = &report->field[3]->value[0];
84*06be0d64Sfrank zago
85*06be0d64Sfrank zago return 0;
86*06be0d64Sfrank zago }
87*06be0d64Sfrank zago
mwctrl_probe(struct hid_device * hdev,const struct hid_device_id * id)88*06be0d64Sfrank zago static int mwctrl_probe(struct hid_device *hdev, const struct hid_device_id *id)
89*06be0d64Sfrank zago {
90*06be0d64Sfrank zago int ret;
91*06be0d64Sfrank zago
92*06be0d64Sfrank zago ret = hid_parse(hdev);
93*06be0d64Sfrank zago if (ret) {
94*06be0d64Sfrank zago hid_err(hdev, "parse failed\n");
95*06be0d64Sfrank zago return ret;
96*06be0d64Sfrank zago }
97*06be0d64Sfrank zago
98*06be0d64Sfrank zago ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
99*06be0d64Sfrank zago if (ret) {
100*06be0d64Sfrank zago hid_err(hdev, "hw start failed\n");
101*06be0d64Sfrank zago return ret;
102*06be0d64Sfrank zago }
103*06be0d64Sfrank zago
104*06be0d64Sfrank zago ret = mwctrl_init(hdev);
105*06be0d64Sfrank zago if (ret)
106*06be0d64Sfrank zago hid_hw_stop(hdev);
107*06be0d64Sfrank zago
108*06be0d64Sfrank zago return ret;
109*06be0d64Sfrank zago }
110*06be0d64Sfrank zago
111*06be0d64Sfrank zago static const struct hid_device_id mwctrl_devices[] = {
112*06be0d64Sfrank zago { HID_USB_DEVICE(USB_VENDOR_MEGAWORLD,
113*06be0d64Sfrank zago USB_DEVICE_ID_MEGAWORLD_GAMEPAD) },
114*06be0d64Sfrank zago { }
115*06be0d64Sfrank zago };
116*06be0d64Sfrank zago MODULE_DEVICE_TABLE(hid, mwctrl_devices);
117*06be0d64Sfrank zago
118*06be0d64Sfrank zago static struct hid_driver mwctrl_driver = {
119*06be0d64Sfrank zago .name = "megaworld",
120*06be0d64Sfrank zago .id_table = mwctrl_devices,
121*06be0d64Sfrank zago .probe = mwctrl_probe,
122*06be0d64Sfrank zago };
123*06be0d64Sfrank zago module_hid_driver(mwctrl_driver);
124*06be0d64Sfrank zago
125*06be0d64Sfrank zago MODULE_LICENSE("GPL");
126