// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Force feedback support for Betop based devices
 *
 *  The devices are distributed under various names and the same USB device ID
 *  can be used in both adapters and actual game controllers.
 *
 *  0x11c2:0x2208 "BTP2185 BFM mode Joystick"
 *   - tested with BTP2185 BFM Mode.
 *
 *  0x11C0:0x5506 "BTP2185 PC mode Joystick"
 *   - tested with BTP2185 PC Mode.
 *
 *  0x8380:0x1850 "BTP2185 V2 PC mode USB Gamepad"
 *   - tested with BTP2185 PC Mode with another version.
 *
 *  0x20bc:0x5500 "BTP2185 V2 BFM mode Joystick"
 *   - tested with BTP2171s.
 *  Copyright (c) 2014 Huang Bo <huangbobupt@163.com>
 */

/*
 */


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

#include "hid-ids.h"

struct betopff_device {
        struct hid_report *report;
};

static int hid_betopff_play(struct input_dev *dev, void *data,
                         struct ff_effect *effect)
{
        struct hid_device *hid = input_get_drvdata(dev);
        struct betopff_device *betopff = data;
        __u16 left, right;

        left = effect->u.rumble.strong_magnitude;
        right = effect->u.rumble.weak_magnitude;

        betopff->report->field[2]->value[0] = left / 256;
        betopff->report->field[3]->value[0] = right / 256;

        hid_hw_request(hid, betopff->report, HID_REQ_SET_REPORT);

        return 0;
}

static int betopff_init(struct hid_device *hid)
{
        struct betopff_device *betopff;
        struct hid_report *report;
        struct hid_input *hidinput;
        struct list_head *report_list =
                        &hid->report_enum[HID_OUTPUT_REPORT].report_list;
        struct input_dev *dev;
        int error;
        int i, j;

        if (list_empty(&hid->inputs)) {
                hid_err(hid, "no inputs found\n");
                return -ENODEV;
        }

        hidinput = list_first_entry(&hid->inputs, struct hid_input, list);
        dev = hidinput->input;

        if (list_empty(report_list)) {
                hid_err(hid, "no output reports found\n");
                return -ENODEV;
        }

        report = list_first_entry(report_list, struct hid_report, list);
        /*
         * Actually there are 4 fields for 4 Bytes as below:
         * -----------------------------------------
         * Byte0  Byte1  Byte2    Byte3
         * 0x00   0x00   left_motor right_motor
         * -----------------------------------------
         * Do init them with default value.
         */
        if (report->maxfield < 4) {
                hid_err(hid, "not enough fields in the report: %d\n",
                                report->maxfield);
                return -ENODEV;
        }
        for (i = 0; i < report->maxfield; i++) {
                if (report->field[i]->report_count < 1) {
                        hid_err(hid, "no values in the field\n");
                        return -ENODEV;
                }
                for (j = 0; j < report->field[i]->report_count; j++) {
                        report->field[i]->value[j] = 0x00;
                }
        }

        betopff = kzalloc_obj(*betopff);
        if (!betopff)
                return -ENOMEM;

        set_bit(FF_RUMBLE, dev->ffbit);

        error = input_ff_create_memless(dev, betopff, hid_betopff_play);
        if (error) {
                kfree(betopff);
                return error;
        }

        betopff->report = report;
        hid_hw_request(hid, betopff->report, HID_REQ_SET_REPORT);

        hid_info(hid, "Force feedback for betop devices by huangbo <huangbobupt@163.com>\n");

        return 0;
}

static int betop_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
        int ret;

        if (id->driver_data)
                hdev->quirks |= HID_QUIRK_MULTI_INPUT;

        ret = hid_parse(hdev);
        if (ret) {
                hid_err(hdev, "parse failed\n");
                goto err;
        }

        ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
        if (ret) {
                hid_err(hdev, "hw start failed\n");
                goto err;
        }

        betopff_init(hdev);

        return 0;
err:
        return ret;
}

static const struct hid_device_id betop_devices[] = {
        { HID_USB_DEVICE(USB_VENDOR_ID_BETOP_2185BFM, 0x2208) },
        { HID_USB_DEVICE(USB_VENDOR_ID_BETOP_2185PC, 0x5506) },
        { HID_USB_DEVICE(USB_VENDOR_ID_BETOP_2185V2PC, 0x1850) },
        { HID_USB_DEVICE(USB_VENDOR_ID_BETOP_2185V2BFM, 0x5500) },
        { }
};
MODULE_DEVICE_TABLE(hid, betop_devices);

static struct hid_driver betop_driver = {
        .name = "betop",
        .id_table = betop_devices,
        .probe = betop_probe,
};
module_hid_driver(betop_driver);

MODULE_DESCRIPTION("Force feedback support for Betop based devices");
MODULE_LICENSE("GPL");