cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hid-megaworld.c (2755B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * Vibration support for Mega World controllers
      4 *
      5 * Copyright 2022 Frank Zago
      6 *
      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 original
     75	 * windows driver has a 5 bytes command, where the 5th byte is
     76	 * a repeat of the 3rd byte, however the device has only 4
     77	 * fields. It could be a bug in the driver, or there is a
     78	 * 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_LICENSE("GPL");