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Diffstat (limited to 'drivers/hid/hid-vrc2.c')
-rw-r--r--drivers/hid/hid-vrc2.c91
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");