1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 *  USB HID driver for Glorious PC Gaming Race
 4 *  Glorious Model O, O- and D mice.
 5 *
 6 *  Copyright (c) 2020 Samuel Čavoj <sammko@sammserver.com>
 7 */
 8
 9/*
10 */
11
12#include <linux/hid.h>
13#include <linux/module.h>
14
15#include "hid-ids.h"
16
17MODULE_AUTHOR("Samuel Čavoj <sammko@sammserver.com>");
18MODULE_DESCRIPTION("HID driver for Glorious PC Gaming Race mice");
19
20/*
21 * Glorious Model O and O- specify the const flag in the consumer input
22 * report descriptor, which leads to inputs being ignored. Fix this
23 * by patching the descriptor.
24 */
25static __u8 *glorious_report_fixup(struct hid_device *hdev, __u8 *rdesc,
26		unsigned int *rsize)
27{
28	if (*rsize == 213 &&
29		rdesc[84] == 129 && rdesc[112] == 129 && rdesc[140] == 129 &&
30		rdesc[85] == 3   && rdesc[113] == 3   && rdesc[141] == 3) {
31		hid_info(hdev, "patching Glorious Model O consumer control report descriptor\n");
32		rdesc[85] = rdesc[113] = rdesc[141] = \
33			HID_MAIN_ITEM_VARIABLE | HID_MAIN_ITEM_RELATIVE;
34	}
35	return rdesc;
36}
37
38static void glorious_update_name(struct hid_device *hdev)
39{
40	const char *model = "Device";
41
42	switch (hdev->product) {
43	case USB_DEVICE_ID_GLORIOUS_MODEL_O:
44		model = "Model O"; break;
45	case USB_DEVICE_ID_GLORIOUS_MODEL_D:
46		model = "Model D"; break;
47	}
48
49	snprintf(hdev->name, sizeof(hdev->name), "%s %s", "Glorious", model);
50}
51
52static int glorious_probe(struct hid_device *hdev,
53		const struct hid_device_id *id)
54{
55	int ret;
56
57	hdev->quirks |= HID_QUIRK_INPUT_PER_APP;
58
59	ret = hid_parse(hdev);
60	if (ret)
61		return ret;
62
63	glorious_update_name(hdev);
64
65	return hid_hw_start(hdev, HID_CONNECT_DEFAULT);
66}
67
68static const struct hid_device_id glorious_devices[] = {
69	{ HID_USB_DEVICE(USB_VENDOR_ID_GLORIOUS,
70		USB_DEVICE_ID_GLORIOUS_MODEL_O) },
71	{ HID_USB_DEVICE(USB_VENDOR_ID_GLORIOUS,
72		USB_DEVICE_ID_GLORIOUS_MODEL_D) },
73	{ }
74};
75MODULE_DEVICE_TABLE(hid, glorious_devices);
76
77static struct hid_driver glorious_driver = {
78	.name = "glorious",
79	.id_table = glorious_devices,
80	.probe = glorious_probe,
81	.report_fixup = glorious_report_fixup
82};
83
84module_hid_driver(glorious_driver);
85
86MODULE_LICENSE("GPL");