diff options
Diffstat (limited to 'drivers/hid/hid-vrc2.c')
-rw-r--r-- | drivers/hid/hid-vrc2.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/drivers/hid/hid-vrc2.c b/drivers/hid/hid-vrc2.c new file mode 100644 index 000000000..80a2b7ef5 --- /dev/null +++ b/drivers/hid/hid-vrc2.c @@ -0,0 +1,91 @@ +// 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"); |