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

  
  	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
  ");

  		goto err;
  	}
  
  	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
  	if (ret) {

  		hid_err(hdev, "hw start failed
  ");

  		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_LICENSE("GPL");