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Now that the HID core can handle const report descriptors, constify them where possible. Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Link: https://patch.msgid.link/20240828-hid-const-fixup-2-v1-7-663b9210eb69@weissschuh.net Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* HID driver for VRC-2 2-axis Car controller
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*
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* Copyright (C) 2022 Marcus Folkesson <marcus.folkesson@gmail.com>
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*/
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#include <linux/device.h>
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#include <linux/hid.h>
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#include <linux/module.h>
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/*
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* VID/PID are probably "borrowed", so keep them locally and
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* do not populate hid-ids.h with those.
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*/
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#define USB_VENDOR_ID_VRC2 (0x07c0)
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#define USB_DEVICE_ID_VRC2 (0x1125)
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static const __u8 vrc2_rdesc_fixed[] = {
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0x05, 0x01, // Usage Page (Generic Desktop Ctrls)
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0x09, 0x04, // Usage (Joystick)
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0xA1, 0x01, // Collection (Application)
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0x09, 0x01, // Usage (Pointer)
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0xA1, 0x00, // Collection (Physical)
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0x09, 0x30, // Usage (X)
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0x09, 0x31, // Usage (Y)
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0x15, 0x00, // Logical Minimum (0)
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0x26, 0xFF, 0x07, // Logical Maximum (2047)
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0x35, 0x00, // Physical Minimum (0)
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0x46, 0xFF, 0x00, // Physical Maximum (255)
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0x75, 0x10, // Report Size (16)
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0x95, 0x02, // Report Count (2)
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0x81, 0x02, // Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
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0xC0, // End Collection
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0x75, 0x08, // Report Size (8)
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0x95, 0x03, // Report Count (3)
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0x81, 0x03, // Input (Cnst,Var,Abs)
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0xC0, // End Collection
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};
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static const __u8 *vrc2_report_fixup(struct hid_device *hdev, __u8 *rdesc,
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unsigned int *rsize)
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{
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hid_info(hdev, "fixing up VRC-2 report descriptor\n");
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*rsize = sizeof(vrc2_rdesc_fixed);
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return vrc2_rdesc_fixed;
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}
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static int vrc2_probe(struct hid_device *hdev, const struct hid_device_id *id)
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{
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int ret;
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/*
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* The device gives us 2 separate USB endpoints.
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* One of those (the one with report descriptor size of 23) is just bogus so ignore it
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*/
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if (hdev->dev_rsize == 23)
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return -ENODEV;
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ret = hid_parse(hdev);
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if (ret) {
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hid_err(hdev, "parse failed\n");
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return ret;
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}
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ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
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if (ret) {
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hid_err(hdev, "hw start failed\n");
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return ret;
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}
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return 0;
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}
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static const struct hid_device_id vrc2_devices[] = {
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{ HID_USB_DEVICE(USB_VENDOR_ID_VRC2, USB_DEVICE_ID_VRC2) },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(hid, vrc2_devices);
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static struct hid_driver vrc2_driver = {
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.name = "vrc2",
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.id_table = vrc2_devices,
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.report_fixup = vrc2_report_fixup,
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.probe = vrc2_probe,
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};
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module_hid_driver(vrc2_driver);
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MODULE_AUTHOR("Marcus Folkesson <marcus.folkesson@gmail.com>");
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MODULE_DESCRIPTION("HID driver for VRC-2 2-axis Car controller");
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MODULE_LICENSE("GPL");
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