drivers/hid/hid-thrustmaster.c - linux - Git at Google

 // 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 <dario.pagani.146+linuxk@gmail.com>
  * Copyright (c) 2020-2021 Kim Kuparinen <kimi.h.kuparinen@gmail.com>
  */
 #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"},
 	{0x0206, 0x0005, "Thrustmaster T300RS"},
 	{0x0204, 0x0005, "Thrustmaster T300 Ferrari Alcantara Edition"},
 	{0x0002, 0x0002, "Thrustmaster T500RS"}
 	//{0x0407, 0x0001, "Thrustmaster TMX"}
 };

 static const uint8_t tm_wheels_infos_length = 4;

 /*
  * 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;
 	}

 	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 = 0;

 	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,
 		0, 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 = 0;

 	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 <dario.pagani.146+linuxk@gmail.com>");
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Driver to initialize some steering wheel joysticks from Thrustmaster");
	// 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 <dario.pagani.146+linuxk@gmail.com>
	* Copyright (c) 2020-2021 Kim Kuparinen <kimi.h.kuparinen@gmail.com>
	*/
	#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"},
	{0x0206, 0x0005, "Thrustmaster T300RS"},
	{0x0204, 0x0005, "Thrustmaster T300 Ferrari Alcantara Edition"},
	{0x0002, 0x0002, "Thrustmaster T500RS"}
	//{0x0407, 0x0001, "Thrustmaster TMX"}
	};

	static const uint8_t tm_wheels_infos_length = 4;

	/*
	* 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;
	}

	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 = 0;

	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,
	0, 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 = 0;

	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 <dario.pagani.146+linuxk@gmail.com>");
	MODULE_LICENSE("GPL");
	MODULE_DESCRIPTION("Driver to initialize some steering wheel joysticks from Thrustmaster");