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2c5e8e61 MF |
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"); |