// SPDX-License-Identifier: GPL-2.0
/*
* When connected to the machine, the Thrustmaster wheels appear as
* a «generic» hid gamepad called "Thrustmaster FFB Wheel".
*
* When in this mode not every functionality of the wheel, like the force feedback,
* are available. To enable all functionalities of a Thrustmaster wheel we have to send
* to it a specific USB CONTROL request with a code different for each wheel.
*
* This driver tries to understand which model of Thrustmaster wheel the generic
* "Thrustmaster FFB Wheel" really is and then sends the appropriate control code.
*
* Copyright (c) 2020-2021 Dario Pagani <[email protected]>
* Copyright (c) 2020-2021 Kim Kuparinen <[email protected]>
*/
#include <linux/hid.h>
#include <linux/usb.h>
#include <linux/input.h>
#include <linux/slab.h>
#include <linux/module.h>
/*
* These interrupts are used to prevent a nasty crash when initializing the
* T300RS. Used in thrustmaster_interrupts().
*/
static const u8 setup_0[] = { 0x42, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
static const u8 setup_1[] = { 0x0a, 0x04, 0x90, 0x03, 0x00, 0x00, 0x00, 0x00 };
static const u8 setup_2[] = { 0x0a, 0x04, 0x00, 0x0c, 0x00, 0x00, 0x00, 0x00 };
static const u8 setup_3[] = { 0x0a, 0x04, 0x12, 0x10, 0x00, 0x00, 0x00, 0x00 };
static const u8 setup_4[] = { 0x0a, 0x04, 0x00, 0x06, 0x00, 0x00, 0x00, 0x00 };
static const u8 *const setup_arr[] = { setup_0, setup_1, setup_2, setup_3, setup_4 };
static const unsigned int setup_arr_sizes[] = {
ARRAY_SIZE(setup_0),
ARRAY_SIZE(setup_1),
ARRAY_SIZE(setup_2),
ARRAY_SIZE(setup_3),
ARRAY_SIZE(setup_4)
};
/*
* This struct contains for each type of
* Thrustmaster wheel
*
* Note: The values are stored in the CPU
* endianness, the USB protocols always use
* little endian; the macro cpu_to_le[BIT]()
* must be used when preparing USB packets
* and vice-versa
*/
struct tm_wheel_info {
uint16_t wheel_type;
/*
* See when the USB control out packet is prepared...
* @TODO The TMX seems to require multiple control codes to switch.
*/
uint16_t switch_value;
char const *const wheel_name;
};
/*
* Known wheels.
* Note: TMX does not work as it requires 2 control packets
*/
static const struct tm_wheel_info tm_wheels_infos[] = {
{0x0306, 0x0006, "Thrustmaster T150RS"},
{0x0200, 0x0005, "Thrustmaster T300RS (Missing Attachment)"},
{0x0206, 0x0005, "Thrustmaster T300RS"},
{0x0209, 0x0005, "Thrustmaster T300RS (Open Wheel Attachment)"},
{0x020a, 0x0005, "Thrustmaster T300RS (Sparco R383 Mod)"},
{0x0204, 0x0005, "Thrustmaster T300 Ferrari Alcantara Edition"},
{0x0002, 0x0002, "Thrustmaster T500RS"}
//{0x0407, 0x0001, "Thrustmaster TMX"}
};
static const uint8_t tm_wheels_infos_length = 7;
/*
* This structs contains (in little endian) the response data
* of the wheel to the request 73
*
* A sufficient research to understand what each field does is not
* beign conducted yet. The position and meaning of fields are a
* just a very optimistic guess based on instinct....
*/
struct __packed tm_wheel_response
{
/*
* Seems to be the type of packet
* - 0x0049 if is data.a (15 bytes)
* - 0x0047 if is data.b (7 bytes)
*/
uint16_t type;
union {
struct __packed {
uint16_t field0;
uint16_t field1;
/*
* Seems to be the model code of the wheel
* Read table thrustmaster_wheels to values
*/
uint16_t model;
uint16_t field2;
uint16_t field3;
uint16_t field4;
uint16_t field5;
} a;
struct __packed {
uint16_t field0;
uint16_t field1;
uint16_t model;
} b;
} data;
};
struct tm_wheel {
struct usb_device *usb_dev;
struct urb *urb;
struct usb_ctrlrequest *model_request;
struct tm_wheel_response *response;
struct usb_ctrlrequest *change_request;
};
/* The control packet to send to wheel */
static const struct usb_ctrlrequest model_request = {
.bRequestType = 0xc1,
.bRequest = 73,
.wValue = 0,
.wIndex = 0,
.wLength = cpu_to_le16(0x0010)
};
static const struct usb_ctrlrequest change_request = {
.bRequestType = 0x41,
.bRequest = 83,
.wValue = 0, // Will be filled by the driver
.wIndex = 0,
.wLength = 0
};
/*
* On some setups initializing the T300RS crashes the kernel,
* these interrupts fix that particular issue. So far they haven't caused any
* adverse effects in other wheels.
*/
static void thrustmaster_interrupts(struct hid_device *hdev)
{
int ret, trans, i, b_ep;
u8 *send_buf = kmalloc(256, GFP_KERNEL);
struct usb_host_endpoint *ep;
struct device *dev = &hdev->dev;
struct usb_interface *usbif = to_usb_interface(dev->parent);
struct usb_device *usbdev = interface_to_usbdev(usbif);
if (!send_buf) {
hid_err(hdev, "failed allocating send buffer\n");
return;
}
if (usbif->cur_altsetting->desc.bNumEndpoints < 2) {
kfree(send_buf);
hid_err(hdev, "Wrong number of endpoints?\n");
return;
}
ep = &usbif->cur_altsetting->endpoint[1];
b_ep = ep->desc.bEndpointAddress;
for (i = 0; i < ARRAY_SIZE(setup_arr); ++i) {
memcpy(send_buf, setup_arr[i], setup_arr_sizes[i]);
ret = usb_interrupt_msg(usbdev,
usb_sndintpipe(usbdev, b_ep),
send_buf,
setup_arr_sizes[i],
&trans,
USB_CTRL_SET_TIMEOUT);
if (ret) {
hid_err(hdev, "setup data couldn't be sent\n");
kfree(send_buf);
return;
}
}
kfree(send_buf);
}
static void thrustmaster_change_handler(struct urb *urb)
{
struct hid_device *hdev = urb->context;
// The wheel seems to kill himself before answering the host and therefore is violating the USB protocol...
if (urb->status == 0 || urb->status == -EPROTO || urb->status == -EPIPE)
hid_info(hdev, "Success?! The wheel should have been initialized!\n");
else
hid_warn(hdev, "URB to change wheel mode seems to have failed with error %d\n", urb->status);
}
/*
* Called by the USB subsystem when the wheel responses to our request
* to get [what it seems to be] the wheel's model.
*
* If the model id is recognized then we send an opportune USB CONTROL REQUEST
* to switch the wheel to its full capabilities
*/
static void thrustmaster_model_handler(struct urb *urb)
{
struct hid_device *hdev = urb->context;
struct tm_wheel *tm_wheel = hid_get_drvdata(hdev);
uint16_t model = 0;
int i, ret;
const struct tm_wheel_info *twi = NULL;
if (urb->status) {
hid_err(hdev, "URB to get model id failed with error %d\n", urb->status);
return;
}
if (tm_wheel->response->type == cpu_to_le16(0x49))
model = le16_to_cpu(tm_wheel->response->data.a.model);
else if (tm_wheel->response->type == cpu_to_le16(0x47))
model = le16_to_cpu(tm_wheel->response->data.b.model);
else {
hid_err(hdev, "Unknown packet type 0x%x, unable to proceed further with wheel init\n", tm_wheel->response->type);
return;
}
for (i = 0; i < tm_wheels_infos_length && !twi; i++)
if (tm_wheels_infos[i].wheel_type == model)
twi = tm_wheels_infos + i;
if (twi)
hid_info(hdev, "Wheel with model id 0x%x is a %s\n", model, twi->wheel_name);
else {
hid_err(hdev, "Unknown wheel's model id 0x%x, unable to proceed further with wheel init\n", model);
return;
}
tm_wheel->change_request->wValue = cpu_to_le16(twi->switch_value);
usb_fill_control_urb(
tm_wheel->urb,
tm_wheel->usb_dev,
usb_sndctrlpipe(tm_wheel->usb_dev, 0),
(char *)tm_wheel->change_request,
NULL, 0, // We do not expect any response from the wheel
thrustmaster_change_handler,
hdev
);
ret = usb_submit_urb(tm_wheel->urb, GFP_ATOMIC);
if (ret)
hid_err(hdev, "Error %d while submitting the change URB. I am unable to initialize this wheel...\n", ret);
}
static void thrustmaster_remove(struct hid_device *hdev)
{
struct tm_wheel *tm_wheel = hid_get_drvdata(hdev);
usb_kill_urb(tm_wheel->urb);
kfree(tm_wheel->change_request);
kfree(tm_wheel->response);
kfree(tm_wheel->model_request);
usb_free_urb(tm_wheel->urb);
kfree(tm_wheel);
hid_hw_stop(hdev);
}
/*
* Function called by HID when a hid Thrustmaster FFB wheel is connected to the host.
* This function starts the hid dev, tries to allocate the tm_wheel data structure and
* finally send an USB CONTROL REQUEST to the wheel to get [what it seems to be] its
* model type.
*/
static int thrustmaster_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
int ret = 0;
struct tm_wheel *tm_wheel = NULL;
if (!hid_is_usb(hdev))
return -EINVAL;
ret = hid_parse(hdev);
if (ret) {
hid_err(hdev, "parse failed with error %d\n", ret);
goto error0;
}
ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
if (ret) {
hid_err(hdev, "hw start failed with error %d\n", ret);
goto error0;
}
// Now we allocate the tm_wheel
tm_wheel = kzalloc(sizeof(struct tm_wheel), GFP_KERNEL);
if (!tm_wheel) {
ret = -ENOMEM;
goto error1;
}
tm_wheel->urb = usb_alloc_urb(0, GFP_ATOMIC);
if (!tm_wheel->urb) {
ret = -ENOMEM;
goto error2;
}
tm_wheel->model_request = kmemdup(&model_request,
sizeof(struct usb_ctrlrequest),
GFP_KERNEL);
if (!tm_wheel->model_request) {
ret = -ENOMEM;
goto error3;
}
tm_wheel->response = kzalloc(sizeof(struct tm_wheel_response), GFP_KERNEL);
if (!tm_wheel->response) {
ret = -ENOMEM;
goto error4;
}
tm_wheel->change_request = kmemdup(&change_request,
sizeof(struct usb_ctrlrequest),
GFP_KERNEL);
if (!tm_wheel->change_request) {
ret = -ENOMEM;
goto error5;
}
tm_wheel->usb_dev = interface_to_usbdev(to_usb_interface(hdev->dev.parent));
hid_set_drvdata(hdev, tm_wheel);
thrustmaster_interrupts(hdev);
usb_fill_control_urb(
tm_wheel->urb,
tm_wheel->usb_dev,
usb_rcvctrlpipe(tm_wheel->usb_dev, 0),
(char *)tm_wheel->model_request,
tm_wheel->response,
sizeof(struct tm_wheel_response),
thrustmaster_model_handler,
hdev
);
ret = usb_submit_urb(tm_wheel->urb, GFP_ATOMIC);
if (ret) {
hid_err(hdev, "Error %d while submitting the URB. I am unable to initialize this wheel...\n", ret);
goto error6;
}
return ret;
error6: kfree(tm_wheel->change_request);
error5: kfree(tm_wheel->response);
error4: kfree(tm_wheel->model_request);
error3: usb_free_urb(tm_wheel->urb);
error2: kfree(tm_wheel);
error1: hid_hw_stop(hdev);
error0:
return ret;
}
static const struct hid_device_id thrustmaster_devices[] = {
{ HID_USB_DEVICE(0x044f, 0xb65d)},
{}
};
MODULE_DEVICE_TABLE(hid, thrustmaster_devices);
static struct hid_driver thrustmaster_driver = {
.name = "hid-thrustmaster",
.id_table = thrustmaster_devices,
.probe = thrustmaster_probe,
.remove = thrustmaster_remove,
};
module_hid_driver(thrustmaster_driver);
MODULE_AUTHOR("Dario Pagani <[email protected]>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Driver to initialize some steering wheel joysticks from Thrustmaster");
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