// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Force feedback support for various HID compliant devices by ThrustMaster:
 *    ThrustMaster FireStorm Dual Power 2
 * and possibly others whose device ids haven't been added.
 *
 *  Modified to support ThrustMaster devices by Zinx Verituse
 *  on 2003-01-25 from the Logitech force feedback driver,
 *  which is by Johann Deneux.
 *
 *  Copyright (c) 2003 Zinx Verituse <zinx@epicsol.org>
 *  Copyright (c) 2002 Johann Deneux
 */

/*
 */

#include <linux/hid.h>
#include <linux/input.h>
#include <linux/math64.h>
#include <linux/slab.h>
#include <linux/module.h>

#include "hid-ids.h"

#define THRUSTMASTER_DEVICE_ID_2_IN_1_DT	0xb320

static const signed short ff_rumble[] = {
	FF_RUMBLE,
	-1
};

static const signed short ff_joystick[] = {
	FF_CONSTANT,
	-1
};

#ifdef CONFIG_THRUSTMASTER_FF

/* Usages for thrustmaster devices I know about */
#define THRUSTMASTER_USAGE_FF	(HID_UP_GENDESK | 0xbb)

struct tmff_device {
	struct hid_report *report;
	struct hid_field *ff_field;
};

/* Changes values from 0 to 0xffff into values from minimum to maximum */
static inline int tmff_scale_u16(unsigned int in, int minimum, int maximum)
{
	s64 ret;

	ret = div_s64((s64)in * ((s64)maximum - minimum), 0xffff) + minimum;
	if (ret < minimum)
		return minimum;
	if (ret > maximum)
		return maximum;
	return ret;
}

/* Changes values from -0x80 to 0x7f into values from minimum to maximum */
static inline int tmff_scale_s8(int in, int minimum, int maximum)
{
	s64 ret;

	ret = div_s64((s64)(in + 0x80) * ((s64)maximum - minimum), 0xff) + minimum;
	if (ret < minimum)
		return minimum;
	if (ret > maximum)
		return maximum;
	return ret;
}

static int tmff_play(struct input_dev *dev, void *data,
		struct ff_effect *effect)
{
	struct hid_device *hid = input_get_drvdata(dev);
	struct tmff_device *tmff = data;
	struct hid_field *ff_field = tmff->ff_field;
	int x, y;
	int left, right;	/* Rumbling */

	switch (effect->type) {
	case FF_CONSTANT:
		x = tmff_scale_s8(effect->u.ramp.start_level,
					ff_field->logical_minimum,
					ff_field->logical_maximum);
		y = tmff_scale_s8(effect->u.ramp.end_level,
					ff_field->logical_minimum,
					ff_field->logical_maximum);

		dbg_hid("(x, y)=(%04x, %04x)\n", x, y);
		ff_field->value[0] = x;
		ff_field->value[1] = y;
		hid_hw_request(hid, tmff->report, HID_REQ_SET_REPORT);
		break;

	case FF_RUMBLE:
		left = tmff_scale_u16(effect->u.rumble.weak_magnitude,
					ff_field->logical_minimum,
					ff_field->logical_maximum);
		right = tmff_scale_u16(effect->u.rumble.strong_magnitude,
					ff_field->logical_minimum,
					ff_field->logical_maximum);

		/* 2-in-1 strong motor is left */
		if (hid->product == THRUSTMASTER_DEVICE_ID_2_IN_1_DT)
			swap(left, right);

		dbg_hid("(left,right)=(%08x, %08x)\n", left, right);
		ff_field->value[0] = left;
		ff_field->value[1] = right;
		hid_hw_request(hid, tmff->report, HID_REQ_SET_REPORT);
		break;
	}
	return 0;
}

static int tm_input_configured(struct hid_device *hid, struct hid_input *hidinput)
{
	struct tmff_device *tmff;
	struct hid_report *report;
	struct list_head *report_list;
	struct input_dev *input_dev = hidinput->input;
	const struct hid_device_id *id;
	const signed short *ff_bits;
	int error;
	int i;

	if (!list_is_first(&hidinput->list, &hid->inputs))
		return 0;

	id = hid_match_device(hid, hid->driver);
	if (!id)
		return -ENODEV;

	ff_bits = (void *)id->driver_data;

	tmff = kzalloc_obj(struct tmff_device);
	if (!tmff)
		return -ENOMEM;

	/* Find the report to use */
	report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
	list_for_each_entry(report, report_list, list) {
		int fieldnum;

		for (fieldnum = 0; fieldnum < report->maxfield; ++fieldnum) {
			struct hid_field *field = report->field[fieldnum];

			if (field->maxusage <= 0)
				continue;

			switch (field->usage[0].hid) {
			case THRUSTMASTER_USAGE_FF:
				if (field->report_count < 2) {
					hid_warn(hid, "ignoring FF field with report_count < 2\n");
					continue;
				}

				if (field->logical_maximum ==
						field->logical_minimum) {
					hid_warn(hid, "ignoring FF field with logical_maximum == logical_minimum\n");
					continue;
				}

				if (tmff->report && tmff->report != report) {
					hid_warn(hid, "ignoring FF field in other report\n");
					continue;
				}

				if (tmff->ff_field && tmff->ff_field != field) {
					hid_warn(hid, "ignoring duplicate FF field\n");
					continue;
				}

				tmff->report = report;
				tmff->ff_field = field;

				for (i = 0; ff_bits[i] >= 0; i++)
					set_bit(ff_bits[i], input_dev->ffbit);

				break;

			default:
				hid_warn(hid, "ignoring unknown output usage %08x\n",
					 field->usage[0].hid);
				continue;
			}
		}
	}

	if (!tmff->report) {
		hid_err(hid, "can't find FF field in output reports\n");
		error = -ENODEV;
		goto fail;
	}

	error = input_ff_create_memless(input_dev, tmff, tmff_play);
	if (error)
		goto fail;

	hid_info(hid, "force feedback for ThrustMaster devices by Zinx Verituse <zinx@epicsol.org>\n");
	return 0;

fail:
	kfree(tmff);
	return error;
}
#else
static inline int tm_input_configured(struct hid_device *hid,
				      struct hid_input *hidinput)
{
	return 0;
}
#endif

static const struct hid_device_id tm_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_THRUSTMASTER, 0xb300),
		.driver_data = (unsigned long)ff_rumble },
	{ HID_USB_DEVICE(USB_VENDOR_ID_THRUSTMASTER, 0xb304),   /* FireStorm Dual Power 2 (and 3) */
		.driver_data = (unsigned long)ff_rumble },
	{ HID_USB_DEVICE(USB_VENDOR_ID_THRUSTMASTER, THRUSTMASTER_DEVICE_ID_2_IN_1_DT),   /* Dual Trigger 2-in-1 */
		.driver_data = (unsigned long)ff_rumble },
	{ HID_USB_DEVICE(USB_VENDOR_ID_THRUSTMASTER, 0xb323),   /* Dual Trigger 3-in-1 (PC Mode) */
		.driver_data = (unsigned long)ff_rumble },
	{ HID_USB_DEVICE(USB_VENDOR_ID_THRUSTMASTER, 0xb324),   /* Dual Trigger 3-in-1 (PS3 Mode) */
		.driver_data = (unsigned long)ff_rumble },
	{ HID_USB_DEVICE(USB_VENDOR_ID_THRUSTMASTER, 0xb605),   /* NASCAR PRO FF2 Wheel */
		.driver_data = (unsigned long)ff_joystick },
	{ HID_USB_DEVICE(USB_VENDOR_ID_THRUSTMASTER, 0xb651),	/* FGT Rumble Force Wheel */
		.driver_data = (unsigned long)ff_rumble },
	{ HID_USB_DEVICE(USB_VENDOR_ID_THRUSTMASTER, 0xb653),	/* RGT Force Feedback CLUTCH Raging Wheel */
		.driver_data = (unsigned long)ff_joystick },
	{ HID_USB_DEVICE(USB_VENDOR_ID_THRUSTMASTER, 0xb654),	/* FGT Force Feedback Wheel */
		.driver_data = (unsigned long)ff_joystick },
	{ HID_USB_DEVICE(USB_VENDOR_ID_THRUSTMASTER, 0xb65a),	/* F430 Force Feedback Wheel */
		.driver_data = (unsigned long)ff_joystick },
	{ }
};
MODULE_DEVICE_TABLE(hid, tm_devices);

static struct hid_driver tm_driver = {
	.name = "thrustmaster",
	.id_table = tm_devices,
	.input_configured = tm_input_configured,
};
module_hid_driver(tm_driver);

MODULE_DESCRIPTION("Force feedback support for various HID compliant devices by ThrustMaster");
MODULE_LICENSE("GPL");