1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * HID driver for Holtek gaming mice
4  * Copyright (c) 2013 Christian Ohm
5  * Heavily inspired by various other HID drivers that adjust the report
6  * descriptor.
7 */
8 
9 /*
10  */
11 
12 #include <linux/hid.h>
13 #include <linux/module.h>
14 #include <linux/usb.h>
15 
16 #include "hid-ids.h"
17 
18 /*
19  * The report descriptor of some Holtek based gaming mice specifies an
20  * excessively large number of consumer usages (2^15), which is more than
21  * HID_MAX_USAGES. This prevents proper parsing of the report descriptor.
22  *
23  * This driver fixes the report descriptor for:
24  * - USB ID 04d9:a067, sold as Sharkoon Drakonia and Perixx MX-2000
25  * - USB ID 04d9:a04a, sold as Tracer Sniper TRM-503, NOVA Gaming Slider X200
26  *   and Zalman ZM-GM1
27  * - USB ID 04d9:a081, sold as SHARKOON DarkGlider Gaming mouse
28  * - USB ID 04d9:a072, sold as LEETGION Hellion Gaming Mouse
29  * - USB ID 04d9:a0c2, sold as ETEKCITY Scroll T-140 Gaming Mouse
30  */
31 
32 static __u8 *holtek_mouse_report_fixup(struct hid_device *hdev, __u8 *rdesc,
33 		unsigned int *rsize)
34 {
35 	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
36 
37 	if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
38 		/* Change usage maximum and logical maximum from 0x7fff to
39 		 * 0x2fff, so they don't exceed HID_MAX_USAGES */
40 		switch (hdev->product) {
41 		case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A067:
42 		case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A072:
43 		case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A0C2:
44 			if (*rsize >= 122 && rdesc[115] == 0xff && rdesc[116] == 0x7f
45 					&& rdesc[120] == 0xff && rdesc[121] == 0x7f) {
46 				hid_info(hdev, "Fixing up report descriptor\n");
47 				rdesc[116] = rdesc[121] = 0x2f;
48 			}
49 			break;
50 		case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A04A:
51 		case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A070:
52 		case USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A081:
53 			if (*rsize >= 113 && rdesc[106] == 0xff && rdesc[107] == 0x7f
54 					&& rdesc[111] == 0xff && rdesc[112] == 0x7f) {
55 				hid_info(hdev, "Fixing up report descriptor\n");
56 				rdesc[107] = rdesc[112] = 0x2f;
57 			}
58 			break;
59 		}
60 
61 	}
62 	return rdesc;
63 }
64 
65 static int holtek_mouse_probe(struct hid_device *hdev,
66 			      const struct hid_device_id *id)
67 {
68 	int ret;
69 
70 	if (!hid_is_usb(hdev))
71 		return -EINVAL;
72 
73 	ret = hid_parse(hdev);
74 	if (ret) {
75 		hid_err(hdev, "hid parse failed: %d\n", ret);
76 		return ret;
77 	}
78 
79 	ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
80 	if (ret) {
81 		hid_err(hdev, "hw start failed: %d\n", ret);
82 		return ret;
83 	}
84 
85 	return 0;
86 }
87 
88 static const struct hid_device_id holtek_mouse_devices[] = {
89 	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
90 			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A067) },
91         { HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
92 			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A070) },
93 	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
94 			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A04A) },
95 	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
96 			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A072) },
97 	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
98 			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A081) },
99 	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
100 			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A0C2) },
101 	{ }
102 };
103 MODULE_DEVICE_TABLE(hid, holtek_mouse_devices);
104 
105 static struct hid_driver holtek_mouse_driver = {
106 	.name = "holtek_mouse",
107 	.id_table = holtek_mouse_devices,
108 	.report_fixup = holtek_mouse_report_fixup,
109 	.probe = holtek_mouse_probe,
110 };
111 
112 module_hid_driver(holtek_mouse_driver);
113 MODULE_LICENSE("GPL");
114