// 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
  ");
  		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(sizeof(struct lg2ff_device), GFP_KERNEL);
  	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>
  ");

  
  	return 0;
  }