| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * HID driver for VRC-2 2-axis Car controller |
| * |
| * Copyright (C) 2022 Marcus Folkesson <marcus.folkesson@gmail.com> |
| */ |
| |
| #include <linux/device.h> |
| #include <linux/hid.h> |
| #include <linux/module.h> |
| |
| /* |
| * VID/PID are probably "borrowed", so keep them locally and |
| * do not populate hid-ids.h with those. |
| */ |
| #define USB_VENDOR_ID_VRC2 (0x07c0) |
| #define USB_DEVICE_ID_VRC2 (0x1125) |
| |
| static __u8 vrc2_rdesc_fixed[] = { |
| 0x05, 0x01, // Usage Page (Generic Desktop Ctrls) |
| 0x09, 0x04, // Usage (Joystick) |
| 0xA1, 0x01, // Collection (Application) |
| 0x09, 0x01, // Usage (Pointer) |
| 0xA1, 0x00, // Collection (Physical) |
| 0x09, 0x30, // Usage (X) |
| 0x09, 0x31, // Usage (Y) |
| 0x15, 0x00, // Logical Minimum (0) |
| 0x26, 0xFF, 0x07, // Logical Maximum (2047) |
| 0x35, 0x00, // Physical Minimum (0) |
| 0x46, 0xFF, 0x00, // Physical Maximum (255) |
| 0x75, 0x10, // Report Size (16) |
| 0x95, 0x02, // Report Count (2) |
| 0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position) |
| 0xC0, // End Collection |
| 0x75, 0x08, // Report Size (8) |
| 0x95, 0x03, // Report Count (3) |
| 0x81, 0x03, // Input (Cnst,Var,Abs) |
| 0xC0, // End Collection |
| }; |
| |
| static __u8 *vrc2_report_fixup(struct hid_device *hdev, __u8 *rdesc, |
| unsigned int *rsize) |
| { |
| hid_info(hdev, "fixing up VRC-2 report descriptor\n"); |
| *rsize = sizeof(vrc2_rdesc_fixed); |
| return vrc2_rdesc_fixed; |
| } |
| |
| static int vrc2_probe(struct hid_device *hdev, const struct hid_device_id *id) |
| { |
| int ret; |
| |
| /* |
| * The device gives us 2 separate USB endpoints. |
| * One of those (the one with report descriptor size of 23) is just bogus so ignore it |
| */ |
| if (hdev->dev_rsize == 23) |
| return -ENODEV; |
| |
| ret = hid_parse(hdev); |
| if (ret) { |
| hid_err(hdev, "parse failed\n"); |
| return ret; |
| } |
| |
| ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT); |
| if (ret) { |
| hid_err(hdev, "hw start failed\n"); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static const struct hid_device_id vrc2_devices[] = { |
| { HID_USB_DEVICE(USB_VENDOR_ID_VRC2, USB_DEVICE_ID_VRC2) }, |
| { /* sentinel */ } |
| }; |
| MODULE_DEVICE_TABLE(hid, vrc2_devices); |
| |
| static struct hid_driver vrc2_driver = { |
| .name = "vrc2", |
| .id_table = vrc2_devices, |
| .report_fixup = vrc2_report_fixup, |
| .probe = vrc2_probe, |
| }; |
| module_hid_driver(vrc2_driver); |
| |
| MODULE_AUTHOR("Marcus Folkesson <marcus.folkesson@gmail.com>"); |
| MODULE_DESCRIPTION("HID driver for VRC-2 2-axis Car controller"); |
| MODULE_LICENSE("GPL"); |