1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * HID driver for VRC-2 2-axis Car controller |
4 | * |
5 | * Copyright (C) 2022 Marcus Folkesson <marcus.folkesson@gmail.com> |
6 | */ |
7 | |
8 | #include <linux/device.h> |
9 | #include <linux/hid.h> |
10 | #include <linux/module.h> |
11 | |
12 | /* |
13 | * VID/PID are probably "borrowed", so keep them locally and |
14 | * do not populate hid-ids.h with those. |
15 | */ |
16 | #define USB_VENDOR_ID_VRC2 (0x07c0) |
17 | #define USB_DEVICE_ID_VRC2 (0x1125) |
18 | |
19 | static __u8 vrc2_rdesc_fixed[] = { |
20 | 0x05, 0x01, // Usage Page (Generic Desktop Ctrls) |
21 | 0x09, 0x04, // Usage (Joystick) |
22 | 0xA1, 0x01, // Collection (Application) |
23 | 0x09, 0x01, // Usage (Pointer) |
24 | 0xA1, 0x00, // Collection (Physical) |
25 | 0x09, 0x30, // Usage (X) |
26 | 0x09, 0x31, // Usage (Y) |
27 | 0x15, 0x00, // Logical Minimum (0) |
28 | 0x26, 0xFF, 0x07, // Logical Maximum (2047) |
29 | 0x35, 0x00, // Physical Minimum (0) |
30 | 0x46, 0xFF, 0x00, // Physical Maximum (255) |
31 | 0x75, 0x10, // Report Size (16) |
32 | 0x95, 0x02, // Report Count (2) |
33 | 0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position) |
34 | 0xC0, // End Collection |
35 | 0x75, 0x08, // Report Size (8) |
36 | 0x95, 0x03, // Report Count (3) |
37 | 0x81, 0x03, // Input (Cnst,Var,Abs) |
38 | 0xC0, // End Collection |
39 | }; |
40 | |
41 | static __u8 *vrc2_report_fixup(struct hid_device *hdev, __u8 *rdesc, |
42 | unsigned int *rsize) |
43 | { |
44 | hid_info(hdev, "fixing up VRC-2 report descriptor\n" ); |
45 | *rsize = sizeof(vrc2_rdesc_fixed); |
46 | return vrc2_rdesc_fixed; |
47 | } |
48 | |
49 | static int vrc2_probe(struct hid_device *hdev, const struct hid_device_id *id) |
50 | { |
51 | int ret; |
52 | |
53 | /* |
54 | * The device gives us 2 separate USB endpoints. |
55 | * One of those (the one with report descriptor size of 23) is just bogus so ignore it |
56 | */ |
57 | if (hdev->dev_rsize == 23) |
58 | return -ENODEV; |
59 | |
60 | ret = hid_parse(hdev); |
61 | if (ret) { |
62 | hid_err(hdev, "parse failed\n" ); |
63 | return ret; |
64 | } |
65 | |
66 | ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); |
67 | if (ret) { |
68 | hid_err(hdev, "hw start failed\n" ); |
69 | return ret; |
70 | } |
71 | |
72 | return 0; |
73 | } |
74 | |
75 | static const struct hid_device_id vrc2_devices[] = { |
76 | { HID_USB_DEVICE(USB_VENDOR_ID_VRC2, USB_DEVICE_ID_VRC2) }, |
77 | { /* sentinel */ } |
78 | }; |
79 | MODULE_DEVICE_TABLE(hid, vrc2_devices); |
80 | |
81 | static struct hid_driver vrc2_driver = { |
82 | .name = "vrc2" , |
83 | .id_table = vrc2_devices, |
84 | .report_fixup = vrc2_report_fixup, |
85 | .probe = vrc2_probe, |
86 | }; |
87 | module_hid_driver(vrc2_driver); |
88 | |
89 | MODULE_AUTHOR("Marcus Folkesson <marcus.folkesson@gmail.com>" ); |
90 | MODULE_DESCRIPTION("HID driver for VRC-2 2-axis Car controller" ); |
91 | MODULE_LICENSE("GPL" ); |
92 | |