// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Force feedback support for Logitech RumblePad and Rumblepad 2
 *
 *  Copyright (c) 2008 Anssi Hannula <anssi.hannula@gmail.com>
 */

/*
 */


#include <linux/input.h>
#include <linux/slab.h>
#include <linux/hid.h>

#include "hid-lg.h"

struct lg2ff_device {
        struct hid_report *report;
};

static int play_effect(struct input_dev *dev, void *data,
                         struct ff_effect *effect)
{
        struct hid_device *hid = input_get_drvdata(dev);
        struct lg2ff_device *lg2ff = data;
        int weak, strong;

        strong = effect->u.rumble.strong_magnitude;
        weak = effect->u.rumble.weak_magnitude;

        if (weak || strong) {
                weak = weak * 0xff / 0xffff;
                strong = strong * 0xff / 0xffff;

                lg2ff->report->field[0]->value[0] = 0x51;
                lg2ff->report->field[0]->value[2] = weak;
                lg2ff->report->field[0]->value[4] = strong;
        } else {
                lg2ff->report->field[0]->value[0] = 0xf3;
                lg2ff->report->field[0]->value[2] = 0x00;
                lg2ff->report->field[0]->value[4] = 0x00;
        }

        hid_hw_request(hid, lg2ff->report, HID_REQ_SET_REPORT);
        return 0;
}

int lg2ff_init(struct hid_device *hid)
{
        struct lg2ff_device *lg2ff;
        struct hid_report *report;
        struct hid_input *hidinput;
        struct input_dev *dev;
        int error;

        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;

        /* Check that the report looks ok */
        report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, 0, 7);
        if (!report)
                return -ENODEV;

        lg2ff = kmalloc_obj(struct lg2ff_device);
        if (!lg2ff)
                return -ENOMEM;

        set_bit(FF_RUMBLE, dev->ffbit);

        error = input_ff_create_memless(dev, lg2ff, play_effect);
        if (error) {
                kfree(lg2ff);
                return error;
        }

        lg2ff->report = report;
        report->field[0]->value[0] = 0xf3;
        report->field[0]->value[1] = 0x00;
        report->field[0]->value[2] = 0x00;
        report->field[0]->value[3] = 0x00;
        report->field[0]->value[4] = 0x00;
        report->field[0]->value[5] = 0x00;
        report->field[0]->value[6] = 0x00;

        hid_hw_request(hid, report, HID_REQ_SET_REPORT);

        hid_info(hid, "Force feedback for Logitech variant 2 rumble devices by Anssi Hannula <anssi.hannula@gmail.com>\n");

        return 0;
}