// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Force feedback support for Zeroplus based devices
 *
 *  Copyright (c) 2005, 2006 Anssi Hannula <anssi.hannula@gmail.com>
 */

/*
 */


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

#include "hid-ids.h"

#ifdef CONFIG_ZEROPLUS_FF

struct zpff_device {
        struct hid_report *report;
};

static int zpff_play(struct input_dev *dev, void *data,
                         struct ff_effect *effect)
{
        struct hid_device *hid = input_get_drvdata(dev);
        struct zpff_device *zpff = data;
        int left, right;

        /*
         * The following is specified the other way around in the Zeroplus
         * datasheet but the order below is correct for the XFX Executioner;
         * however it is possible that the XFX Executioner is an exception
         */

        left = effect->u.rumble.strong_magnitude;
        right = effect->u.rumble.weak_magnitude;
        dbg_hid("called with 0x%04x 0x%04x\n", left, right);

        left = left * 0x7f / 0xffff;
        right = right * 0x7f / 0xffff;

        zpff->report->field[2]->value[0] = left;
        zpff->report->field[3]->value[0] = right;
        dbg_hid("running with 0x%02x 0x%02x\n", left, right);
        hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);

        return 0;
}

static int zpff_init(struct hid_device *hid)
{
        struct zpff_device *zpff;
        struct hid_report *report;
        struct hid_input *hidinput;
        struct input_dev *dev;
        int i, 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;

        for (i = 0; i < 4; i++) {
                report = hid_validate_values(hid, HID_OUTPUT_REPORT, 0, i, 1);
                if (!report)
                        return -ENODEV;
        }

        zpff = kzalloc_obj(struct zpff_device);
        if (!zpff)
                return -ENOMEM;

        set_bit(FF_RUMBLE, dev->ffbit);

        error = input_ff_create_memless(dev, zpff, zpff_play);
        if (error) {
                kfree(zpff);
                return error;
        }

        zpff->report = report;
        zpff->report->field[0]->value[0] = 0x00;
        zpff->report->field[1]->value[0] = 0x02;
        zpff->report->field[2]->value[0] = 0x00;
        zpff->report->field[3]->value[0] = 0x00;
        hid_hw_request(hid, zpff->report, HID_REQ_SET_REPORT);

        hid_info(hid, "force feedback for Zeroplus based devices by Anssi Hannula <anssi.hannula@gmail.com>\n");

        return 0;
}
#else
static inline int zpff_init(struct hid_device *hid)
{
        return 0;
}
#endif

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

        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;
        }

        zpff_init(hdev);

        return 0;
err:
        return ret;
}

static const struct hid_device_id zp_devices[] = {
        { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0005) },
        { HID_USB_DEVICE(USB_VENDOR_ID_ZEROPLUS, 0x0030) },
        { }
};
MODULE_DEVICE_TABLE(hid, zp_devices);

static struct hid_driver zp_driver = {
        .name = "zeroplus",
        .id_table = zp_devices,
        .probe = zp_probe,
};
module_hid_driver(zp_driver);

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