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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Vibration support for Mega World controllers4 *5 * Copyright 2022 Frank Zago6 *7 * Derived from hid-zpff.c:8 * Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com>9 */10 11#include <linux/hid.h>12#include <linux/input.h>13#include <linux/module.h>14#include <linux/slab.h>15 16#include "hid-ids.h"17 18struct mwctrl_device {19 struct hid_report *report;20 s32 *weak;21 s32 *strong;22};23 24static int mwctrl_play(struct input_dev *dev, void *data,25 struct ff_effect *effect)26{27 struct hid_device *hid = input_get_drvdata(dev);28 struct mwctrl_device *mwctrl = data;29 30 *mwctrl->strong = effect->u.rumble.strong_magnitude >> 8;31 *mwctrl->weak = effect->u.rumble.weak_magnitude >> 8;32 33 hid_hw_request(hid, mwctrl->report, HID_REQ_SET_REPORT);34 35 return 0;36}37 38static int mwctrl_init(struct hid_device *hid)39{40 struct mwctrl_device *mwctrl;41 struct hid_report *report;42 struct hid_input *hidinput;43 struct input_dev *dev;44 int error;45 int i;46 47 if (list_empty(&hid->inputs)) {48 hid_err(hid, "no inputs found\n");49 return -ENODEV;50 }51 hidinput = list_entry(hid->inputs.next, struct hid_input, list);52 dev = hidinput->input;53 54 for (i = 0; i < 4; i++) {55 report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, i, 1);56 if (!report)57 return -ENODEV;58 }59 60 mwctrl = kzalloc(sizeof(struct mwctrl_device), GFP_KERNEL);61 if (!mwctrl)62 return -ENOMEM;63 64 set_bit(FF_RUMBLE, dev->ffbit);65 66 error = input_ff_create_memless(dev, mwctrl, mwctrl_play);67 if (error) {68 kfree(mwctrl);69 return error;70 }71 72 mwctrl->report = report;73 74 /* Field 0 is always 2, and field 1 is always 0. The original75 * windows driver has a 5 bytes command, where the 5th byte is76 * a repeat of the 3rd byte, however the device has only 477 * fields. It could be a bug in the driver, or there is a78 * different device that needs it.79 */80 report->field[0]->value[0] = 0x02;81 82 mwctrl->strong = &report->field[2]->value[0];83 mwctrl->weak = &report->field[3]->value[0];84 85 return 0;86}87 88static int mwctrl_probe(struct hid_device *hdev, const struct hid_device_id *id)89{90 int ret;91 92 ret = hid_parse(hdev);93 if (ret) {94 hid_err(hdev, "parse failed\n");95 return ret;96 }97 98 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);99 if (ret) {100 hid_err(hdev, "hw start failed\n");101 return ret;102 }103 104 ret = mwctrl_init(hdev);105 if (ret)106 hid_hw_stop(hdev);107 108 return ret;109}110 111static const struct hid_device_id mwctrl_devices[] = {112 { HID_USB_DEVICE(USB_VENDOR_MEGAWORLD,113 USB_DEVICE_ID_MEGAWORLD_GAMEPAD) },114 { }115};116MODULE_DEVICE_TABLE(hid, mwctrl_devices);117 118static struct hid_driver mwctrl_driver = {119 .name = "megaworld",120 .id_table = mwctrl_devices,121 .probe = mwctrl_probe,122};123module_hid_driver(mwctrl_driver);124 125MODULE_DESCRIPTION("Vibration support for Mega World controllers");126MODULE_LICENSE("GPL");127