// SPDX-License-Identifier: GPL-2.0-or-later

  /*
   * HID driver for Holtek gaming mice
   * Copyright (c) 2013 Christian Ohm
   * Heavily inspired by various other HID drivers that adjust the report
   * descriptor.
  */
  
  /*

   */
  
  #include <linux/hid.h>
  #include <linux/module.h>
  #include <linux/usb.h>
  
  #include "hid-ids.h"
  
  /*
   * The report descriptor of some Holtek based gaming mice specifies an
   * excessively large number of consumer usages (2^15), which is more than
   * HID_MAX_USAGES. This prevents proper parsing of the report descriptor.
   *

   * This driver fixes the report descriptor for:
   * - USB ID 04d9:a067, sold as Sharkoon Drakonia and Perixx MX-2000
   * - USB ID 04d9:a04a, sold as Tracer Sniper TRM-503, NOVA Gaming Slider X200
   *   and Zalman ZM-GM1

   * - USB ID 04d9:a081, sold as SHARKOON DarkGlider Gaming mouse

   * - USB ID 04d9:a072, sold as LEETGION Hellion Gaming Mouse

   * - USB ID 04d9:a0c2, sold as ETEKCITY Scroll T-140 Gaming Mouse

   */
  
  static __u8 *holtek_mouse_report_fixup(struct hid_device *hdev, __u8 *rdesc,
  		unsigned int *rsize)
  {
  	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
  
  	if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
  		/* Change usage maximum and logical maximum from 0x7fff to
  		 * 0x2fff, so they don't exceed HID_MAX_USAGES */

  		switch (hdev->product) {
  		case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A067:

  		case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A072:

  		case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A0C2:

  			if (*rsize >= 122 && rdesc[115] == 0xff && rdesc[116] == 0x7f
  					&& rdesc[120] == 0xff && rdesc[121] == 0x7f) {
  				hid_info(hdev, "Fixing up report descriptor
  ");
  				rdesc[116] = rdesc[121] = 0x2f;
  			}
  			break;
  		case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A04A:

  		case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A070:

  		case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A081:

  			if (*rsize >= 113 && rdesc[106] == 0xff && rdesc[107] == 0x7f
  					&& rdesc[111] == 0xff && rdesc[112] == 0x7f) {
  				hid_info(hdev, "Fixing up report descriptor
  ");
  				rdesc[107] = rdesc[112] = 0x2f;
  			}
  			break;

  		}

  	}
  	return rdesc;
  }
  
  static const struct hid_device_id holtek_mouse_devices[] = {
  	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
  			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A067) },

          { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
  			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A070) },

  	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
  			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A04A) },

  	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,

  			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A072) },
  	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,

  			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A081) },

  	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
  			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A0C2) },

  	{ }
  };
  MODULE_DEVICE_TABLE(hid, holtek_mouse_devices);
  
  static struct hid_driver holtek_mouse_driver = {
  	.name = "holtek_mouse",
  	.id_table = holtek_mouse_devices,
  	.report_fixup = holtek_mouse_report_fixup,
  };

  module_hid_driver(holtek_mouse_driver);

  MODULE_LICENSE("GPL");