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 const __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 const __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