/*

   *  Force feedback support for Logitech RumblePad and Rumblepad 2

   *
   *  Copyright (c) 2008 Anssi Hannula <anssi.hannula@gmail.com>
   */
  
  /*
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
   */
  
  
  #include <linux/input.h>

  #include <linux/slab.h>

  #include <linux/usb.h>
  #include <linux/hid.h>

  
  #include "usbhid/usbhid.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;
  	}
  
  	usbhid_submit_report(hid, lg2ff->report, USB_DIR_OUT);
  	return 0;
  }

  int lg2ff_init(struct hid_device *hid)

  {
  	struct lg2ff_device *lg2ff;
  	struct hid_report *report;
  	struct hid_input *hidinput = list_entry(hid->inputs.next,
  						struct hid_input, list);
  	struct list_head *report_list =
  			&hid->report_enum[HID_OUTPUT_REPORT].report_list;
  	struct input_dev *dev = hidinput->input;
  	int error;
  
  	if (list_empty(report_list)) {

  		hid_err(hid, "no output report found
  ");

  		return -ENODEV;
  	}
  
  	report = list_entry(report_list->next, struct hid_report, list);
  
  	if (report->maxfield < 1) {

  		hid_err(hid, "output report is empty
  ");

  		return -ENODEV;
  	}
  	if (report->field[0]->report_count < 7) {

  		hid_err(hid, "not enough values in the field
  ");

  		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;
  
  	usbhid_submit_report(hid, report, USB_DIR_OUT);

  	hid_info(hid, "Force feedback for Logitech RumblePad/Rumblepad 2 by Anssi Hannula <anssi.hannula@gmail.com>
  ");

  
  	return 0;
  }