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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/drivers/hid/hid-holtek-mouse.c
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// SPDX-License-Identifier: GPL-2.0-or-later

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/*

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 * HID driver for Holtek gaming mice

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 * Copyright (c) 2013 Christian Ohm

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 * Heavily inspired by various other HID drivers that adjust the report

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 * descriptor.

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*/

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/*

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 */

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#include <linux/hid.h>

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#include <linux/module.h>

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#include <linux/usb.h>

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#include "hid-ids.h"

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/*

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 * The report descriptor of some Holtek based gaming mice specifies an

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 * excessively large number of consumer usages (2^15), which is more than

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 * HID_MAX_USAGES. This prevents proper parsing of the report descriptor.

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 *

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 * This driver fixes the report descriptor for:

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 * - USB ID 04d9:a067, sold as Sharkoon Drakonia and Perixx MX-2000

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 * - USB ID 04d9:a04a, sold as Tracer Sniper TRM-503, NOVA Gaming Slider X200

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 *   and Zalman ZM-GM1

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

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

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

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 */

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static const __u8 *holtek_mouse_report_fixup(struct hid_device *hdev,

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		__u8 *rdesc, unsigned int *rsize)

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{

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	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);

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	if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {

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		/* Change usage maximum and logical maximum from 0x7fff to

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		 * 0x2fff, so they don't exceed HID_MAX_USAGES */

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		switch (hdev->product) {

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		case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A067:

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		case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A072:

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		case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A0C2:

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			if (*rsize >= 122 && rdesc[115] == 0xff && rdesc[116] == 0x7f

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					&& rdesc[120] == 0xff && rdesc[121] == 0x7f) {

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				hid_info(hdev, "Fixing up report descriptor\n");

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				rdesc[116] = rdesc[121] = 0x2f;

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			}

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			break;

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		case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A04A:

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		case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A070:

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		case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A081:

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			if (*rsize >= 113 && rdesc[106] == 0xff && rdesc[107] == 0x7f

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					&& rdesc[111] == 0xff && rdesc[112] == 0x7f) {

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				hid_info(hdev, "Fixing up report descriptor\n");

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				rdesc[107] = rdesc[112] = 0x2f;

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			}

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			break;

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		}

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	}

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	return rdesc;

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}

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static int holtek_mouse_probe(struct hid_device *hdev,

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			      const struct hid_device_id *id)

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{

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	int ret;

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	if (!hid_is_usb(hdev))

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		return -EINVAL;

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	ret = hid_parse(hdev);

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	if (ret) {

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		hid_err(hdev, "hid parse failed: %d\n", ret);

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		return ret;

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	}

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	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);

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	if (ret) {

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		hid_err(hdev, "hw start failed: %d\n", ret);

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		return ret;

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	}

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	return 0;

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}

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static const struct hid_device_id holtek_mouse_devices[] = {

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	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,

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			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A067) },

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        { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,

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			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A070) },

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	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,

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			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A04A) },

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	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,

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			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A072) },

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	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,

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			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A081) },

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	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,

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			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A0C2) },

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	{ }

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};

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MODULE_DEVICE_TABLE(hid, holtek_mouse_devices);

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static struct hid_driver holtek_mouse_driver = {

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	.name = "holtek_mouse",

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	.id_table = holtek_mouse_devices,

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	.report_fixup = holtek_mouse_report_fixup,

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	.probe = holtek_mouse_probe,

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};

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module_hid_driver(holtek_mouse_driver);

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MODULE_DESCRIPTION("HID driver for Holtek gaming mice");

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MODULE_LICENSE("GPL");

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