Quelle  hid-universal-pidff.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * HID UNIVERSAL PIDFF
 * hid-pidff wrapper for PID-enabled devices
 * Handles device reports, quirks and extends usable button range
 *
 * Copyright (c) 2024, 2025 Oleg Makarenko
 * Copyright (c) 2024, 2025 Tomasz Pakuła
 */

#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>
#include <linux/input-event-codes.h>
#include "hid-ids.h"
#include "usbhid/hid-pidff.h"

#define JOY_RANGE (BTN_DEAD - BTN_JOYSTICK + 1)

/*
 * Map buttons manually to extend the default joystick button limit
 */
static int universal_pidff_input_mapping(struct hid_device *hdev,
 struct hid_input *hi, struct hid_field *field, struct hid_usage *usage,
 unsigned long **bit, int *max)
{
 if ((usage->hid & HID_USAGE_PAGE) != HID_UP_BUTTON)
  return 0;

 if (field->application != HID_GD_JOYSTICK)
  return 0;

 int button = ((usage->hid - 1) & HID_USAGE);
 int code = button + BTN_JOYSTICK;

 /* Detect the end of JOYSTICK buttons range */
 if (code > BTN_DEAD)
  code = button + KEY_NEXT_FAVORITE - JOY_RANGE;

 /*
 * Map overflowing buttons to KEY_RESERVED to not ignore
 * them and let them still trigger MSC_SCAN
 */
 if (code > KEY_MAX)
  code = KEY_RESERVED;

 hid_map_usage(hi, usage, bit, max, EV_KEY, code);
 hid_dbg(hdev, "Button %d: usage %d", button, code);
 return 1;
}

/*
 * Check if the device is PID and initialize it
 * Add quirks after initialisation
 */
static int universal_pidff_probe(struct hid_device *hdev,
     const struct hid_device_id *id)
{
 int i, error;

 error = hid_parse(hdev);
 if (error) {
  hid_err(hdev, "HID parse failed\n");
  goto err;
 }

 error = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
 if (error) {
  hid_err(hdev, "HID hw start failed\n");
  goto err;
 }

 /* Check if device contains PID usage page */
 error = 1;
 for (i = 0; i < hdev->collection_size; i++)
  if ((hdev->collection[i].usage & HID_USAGE_PAGE) == HID_UP_PID) {
   error = 0;
   hid_dbg(hdev, "PID usage page found\n");
   break;
  }

 /*
 * Do not fail as this might be the second "device"
 * just for additional buttons/axes. Exit cleanly if force
 * feedback usage page wasn't found (included devices were
 * tested and confirmed to be USB PID after all).
 */
 if (error) {
  hid_dbg(hdev, "PID usage page not found in the descriptor\n");
  return 0;
 }

 /* Check if HID_PID support is enabled */
 int (*init_function)(struct hid_device *, u32);

 init_function = hid_pidff_init_with_quirks;
 if (!init_function) {
  hid_warn(hdev, "HID_PID support not enabled!\n");
  return 0;
 }

 error = init_function(hdev, id->driver_data);
 if (error) {
  hid_warn(hdev, "Error initialising force feedback\n");
  goto err;
 }

 hid_info(hdev, "Universal pidff driver loaded successfully!");

 return 0;
err:
 return error;
}

static int universal_pidff_input_configured(struct hid_device *hdev,
         struct hid_input *hidinput)
{
 int axis;
 struct input_dev *input = hidinput->input;

 if (!input->absinfo)
  return 0;

 /* Decrease fuzz and deadzone on available axes */
 for (axis = ABS_X; axis <= ABS_BRAKE; axis++) {
  if (!test_bit(axis, input->absbit))
   continue;

  input_set_abs_params(input, axis,
   input->absinfo[axis].minimum,
   input->absinfo[axis].maximum,
   axis == ABS_X ? 0 : 8, 0);
 }

 /* Remove fuzz and deadzone from the second joystick axis */
 if (hdev->vendor == USB_VENDOR_ID_FFBEAST &&
     hdev->product == USB_DEVICE_ID_FFBEAST_JOYSTICK)
  input_set_abs_params(input, ABS_Y,
   input->absinfo[ABS_Y].minimum,
   input->absinfo[ABS_Y].maximum, 0, 0);

 return 0;
}

static const struct hid_device_id universal_pidff_devices[] = {
 { HID_USB_DEVICE(USB_VENDOR_ID_MOZA, USB_DEVICE_ID_MOZA_R3),
  .driver_data = HID_PIDFF_QUIRK_FIX_CONDITIONAL_DIRECTION },
 { HID_USB_DEVICE(USB_VENDOR_ID_MOZA, USB_DEVICE_ID_MOZA_R3_2),
  .driver_data = HID_PIDFF_QUIRK_FIX_CONDITIONAL_DIRECTION },
 { HID_USB_DEVICE(USB_VENDOR_ID_MOZA, USB_DEVICE_ID_MOZA_R5),
  .driver_data = HID_PIDFF_QUIRK_FIX_CONDITIONAL_DIRECTION },
 { HID_USB_DEVICE(USB_VENDOR_ID_MOZA, USB_DEVICE_ID_MOZA_R5_2),
  .driver_data = HID_PIDFF_QUIRK_FIX_CONDITIONAL_DIRECTION },
 { HID_USB_DEVICE(USB_VENDOR_ID_MOZA, USB_DEVICE_ID_MOZA_R9),
  .driver_data = HID_PIDFF_QUIRK_FIX_CONDITIONAL_DIRECTION },
 { HID_USB_DEVICE(USB_VENDOR_ID_MOZA, USB_DEVICE_ID_MOZA_R9_2),
  .driver_data = HID_PIDFF_QUIRK_FIX_CONDITIONAL_DIRECTION },
 { HID_USB_DEVICE(USB_VENDOR_ID_MOZA, USB_DEVICE_ID_MOZA_R12),
  .driver_data = HID_PIDFF_QUIRK_FIX_CONDITIONAL_DIRECTION },
 { HID_USB_DEVICE(USB_VENDOR_ID_MOZA, USB_DEVICE_ID_MOZA_R12_2),
  .driver_data = HID_PIDFF_QUIRK_FIX_CONDITIONAL_DIRECTION },
 { HID_USB_DEVICE(USB_VENDOR_ID_MOZA, USB_DEVICE_ID_MOZA_R16_R21),
  .driver_data = HID_PIDFF_QUIRK_FIX_CONDITIONAL_DIRECTION },
 { HID_USB_DEVICE(USB_VENDOR_ID_MOZA, USB_DEVICE_ID_MOZA_R16_R21_2),
  .driver_data = HID_PIDFF_QUIRK_FIX_CONDITIONAL_DIRECTION },
 { HID_USB_DEVICE(USB_VENDOR_ID_CAMMUS, USB_DEVICE_ID_CAMMUS_C5) },
 { HID_USB_DEVICE(USB_VENDOR_ID_CAMMUS, USB_DEVICE_ID_CAMMUS_C12) },
 { HID_USB_DEVICE(USB_VENDOR_ID_VRS, USB_DEVICE_ID_VRS_DFP),
  .driver_data = HID_PIDFF_QUIRK_PERMISSIVE_CONTROL },
 { HID_USB_DEVICE(USB_VENDOR_ID_FFBEAST, USB_DEVICE_ID_FFBEAST_JOYSTICK), },
 { HID_USB_DEVICE(USB_VENDOR_ID_FFBEAST, USB_DEVICE_ID_FFBEAST_RUDDER), },
 { HID_USB_DEVICE(USB_VENDOR_ID_FFBEAST, USB_DEVICE_ID_FFBEAST_WHEEL) },
 { HID_USB_DEVICE(USB_VENDOR_ID_LITE_STAR, USB_DEVICE_ID_PXN_V10),
  .driver_data = HID_PIDFF_QUIRK_PERIODIC_SINE_ONLY },
 { HID_USB_DEVICE(USB_VENDOR_ID_LITE_STAR, USB_DEVICE_ID_PXN_V12),
  .driver_data = HID_PIDFF_QUIRK_PERIODIC_SINE_ONLY },
 { HID_USB_DEVICE(USB_VENDOR_ID_LITE_STAR, USB_DEVICE_ID_PXN_V12_LITE),
  .driver_data = HID_PIDFF_QUIRK_PERIODIC_SINE_ONLY },
 { HID_USB_DEVICE(USB_VENDOR_ID_LITE_STAR, USB_DEVICE_ID_PXN_V12_LITE_2),
  .driver_data = HID_PIDFF_QUIRK_PERIODIC_SINE_ONLY },
 { HID_USB_DEVICE(USB_VENDOR_ID_LITE_STAR, USB_DEVICE_ID_LITE_STAR_GT987),
  .driver_data = HID_PIDFF_QUIRK_PERIODIC_SINE_ONLY },
 { HID_USB_DEVICE(USB_VENDOR_ID_ASETEK, USB_DEVICE_ID_ASETEK_INVICTA) },
 { HID_USB_DEVICE(USB_VENDOR_ID_ASETEK, USB_DEVICE_ID_ASETEK_FORTE) },
 { HID_USB_DEVICE(USB_VENDOR_ID_ASETEK, USB_DEVICE_ID_ASETEK_LA_PRIMA) },
 { HID_USB_DEVICE(USB_VENDOR_ID_ASETEK, USB_DEVICE_ID_ASETEK_TONY_KANAAN) },
 { }
};
MODULE_DEVICE_TABLE(hid, universal_pidff_devices);

static struct hid_driver universal_pidff = {
 .name = "hid-universal-pidff",
 .id_table = universal_pidff_devices,
 .input_mapping = universal_pidff_input_mapping,
 .probe = universal_pidff_probe,
 .input_configured = universal_pidff_input_configured
};
module_hid_driver(universal_pidff);

MODULE_DESCRIPTION("Universal driver for USB PID Force Feedback devices");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Oleg Makarenko <oleg@makarenk.ooo>");
MODULE_AUTHOR("Tomasz Pakuła <tomasz.pakula.oficjalny@gmail.com>");