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