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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Vibration support for Mega World controllers
*
* Copyright 2022 Frank Zago
*
* Derived from hid-zpff.c:
* Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com>
*/
#include <linux/hid.h>
#include <linux/input.h>
#include <linux/module.h>
#include <linux/slab.h>
#include "hid-ids.h"
struct mwctrl_device {
struct hid_report *report;
s32 *weak;
s32 *strong;
};
static int mwctrl_play(struct input_dev *dev, void *data,
struct ff_effect *effect)
{
struct hid_device *hid = input_get_drvdata(dev);
struct mwctrl_device *mwctrl = data;
*mwctrl->strong = effect->u.rumble.strong_magnitude >> 8;
*mwctrl->weak = effect->u.rumble.weak_magnitude >> 8;
hid_hw_request(hid, mwctrl->report, HID_REQ_SET_REPORT);
return 0;
}
static int mwctrl_init(struct hid_device *hid)
{
struct mwctrl_device *mwctrl;
struct hid_report *report;
struct hid_input *hidinput;
struct input_dev *dev;
int error;
int i;
if (list_empty(&hid->inputs)) {
hid_err(hid, "no inputs found\n");
return -ENODEV;
}
hidinput = list_entry(hid->inputs.next, struct hid_input, list);
dev = hidinput->input;
for (i = 0; i < 4; i++) {
report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, i, 1);
if (!report)
return -ENODEV;
}
mwctrl = kzalloc(sizeof(struct mwctrl_device), GFP_KERNEL);
if (!mwctrl)
return -ENOMEM;
set_bit(FF_RUMBLE, dev->ffbit);
error = input_ff_create_memless(dev, mwctrl, mwctrl_play);
if (error) {
kfree(mwctrl);
return error;
}
mwctrl->report = report;
/* Field 0 is always 2, and field 1 is always 0. The original
* windows driver has a 5 bytes command, where the 5th byte is
* a repeat of the 3rd byte, however the device has only 4
* fields. It could be a bug in the driver, or there is a
* different device that needs it.
*/
report->field[0]->value[0] = 0x02;
mwctrl->strong = &report->field[2]->value[0];
mwctrl->weak = &report->field[3]->value[0];
return 0;
}
static int mwctrl_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
int ret;
ret = hid_parse(hdev);
if (ret) {
hid_err(hdev, "parse failed\n");
return ret;
}
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
if (ret) {
hid_err(hdev, "hw start failed\n");
return ret;
}
ret = mwctrl_init(hdev);
if (ret)
hid_hw_stop(hdev);
return ret;
}
static const struct hid_device_id mwctrl_devices[] = {
{ HID_USB_DEVICE(USB_VENDOR_MEGAWORLD,
USB_DEVICE_ID_MEGAWORLD_GAMEPAD) },
{ }
};
MODULE_DEVICE_TABLE(hid, mwctrl_devices);
static struct hid_driver mwctrl_driver = {
.name = "megaworld",
.id_table = mwctrl_devices,
.probe = mwctrl_probe,
};
module_hid_driver(mwctrl_driver);
MODULE_DESCRIPTION("Vibration support for Mega World controllers");
MODULE_LICENSE("GPL");
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