390 lines
10 KiB
C
390 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* When connected to the machine, the Thrustmaster wheels appear as
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* a «generic» hid gamepad called "Thrustmaster FFB Wheel".
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*
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* When in this mode not every functionality of the wheel, like the force feedback,
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* are available. To enable all functionalities of a Thrustmaster wheel we have to send
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* to it a specific USB CONTROL request with a code different for each wheel.
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*
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* This driver tries to understand which model of Thrustmaster wheel the generic
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* "Thrustmaster FFB Wheel" really is and then sends the appropriate control code.
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*
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* Copyright (c) 2020-2021 Dario Pagani <dario.pagani.146+linuxk@gmail.com>
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* Copyright (c) 2020-2021 Kim Kuparinen <kimi.h.kuparinen@gmail.com>
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*/
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#include <linux/hid.h>
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#include <linux/usb.h>
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#include <linux/input.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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/*
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* These interrupts are used to prevent a nasty crash when initializing the
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* T300RS. Used in thrustmaster_interrupts().
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*/
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static const u8 setup_0[] = { 0x42, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
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static const u8 setup_1[] = { 0x0a, 0x04, 0x90, 0x03, 0x00, 0x00, 0x00, 0x00 };
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static const u8 setup_2[] = { 0x0a, 0x04, 0x00, 0x0c, 0x00, 0x00, 0x00, 0x00 };
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static const u8 setup_3[] = { 0x0a, 0x04, 0x12, 0x10, 0x00, 0x00, 0x00, 0x00 };
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static const u8 setup_4[] = { 0x0a, 0x04, 0x00, 0x06, 0x00, 0x00, 0x00, 0x00 };
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static const u8 *const setup_arr[] = { setup_0, setup_1, setup_2, setup_3, setup_4 };
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static const unsigned int setup_arr_sizes[] = {
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ARRAY_SIZE(setup_0),
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ARRAY_SIZE(setup_1),
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ARRAY_SIZE(setup_2),
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ARRAY_SIZE(setup_3),
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ARRAY_SIZE(setup_4)
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};
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/*
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* This struct contains for each type of
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* Thrustmaster wheel
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*
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* Note: The values are stored in the CPU
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* endianness, the USB protocols always use
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* little endian; the macro cpu_to_le[BIT]()
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* must be used when preparing USB packets
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* and vice-versa
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*/
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struct tm_wheel_info {
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uint16_t wheel_type;
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/*
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* See when the USB control out packet is prepared...
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* @TODO The TMX seems to require multiple control codes to switch.
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*/
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uint16_t switch_value;
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char const *const wheel_name;
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};
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/*
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* Known wheels.
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* Note: TMX does not work as it requires 2 control packets
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*/
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static const struct tm_wheel_info tm_wheels_infos[] = {
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{0x0306, 0x0006, "Thrustmaster T150RS"},
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{0x0200, 0x0005, "Thrustmaster T300RS (Missing Attachment)"},
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{0x0206, 0x0005, "Thrustmaster T300RS"},
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{0x0209, 0x0005, "Thrustmaster T300RS (Open Wheel Attachment)"},
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{0x020a, 0x0005, "Thrustmaster T300RS (Sparco R383 Mod)"},
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{0x0204, 0x0005, "Thrustmaster T300 Ferrari Alcantara Edition"},
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{0x0002, 0x0002, "Thrustmaster T500RS"}
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//{0x0407, 0x0001, "Thrustmaster TMX"}
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};
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static const uint8_t tm_wheels_infos_length = 7;
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/*
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* This structs contains (in little endian) the response data
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* of the wheel to the request 73
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*
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* A sufficient research to understand what each field does is not
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* beign conducted yet. The position and meaning of fields are a
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* just a very optimistic guess based on instinct....
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*/
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struct __packed tm_wheel_response
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{
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/*
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* Seems to be the type of packet
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* - 0x0049 if is data.a (15 bytes)
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* - 0x0047 if is data.b (7 bytes)
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*/
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uint16_t type;
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union {
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struct __packed {
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uint16_t field0;
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uint16_t field1;
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/*
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* Seems to be the model code of the wheel
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* Read table thrustmaster_wheels to values
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*/
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uint16_t model;
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uint16_t field2;
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uint16_t field3;
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uint16_t field4;
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uint16_t field5;
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} a;
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struct __packed {
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uint16_t field0;
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uint16_t field1;
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uint16_t model;
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} b;
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} data;
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};
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struct tm_wheel {
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struct usb_device *usb_dev;
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struct urb *urb;
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struct usb_ctrlrequest *model_request;
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struct tm_wheel_response *response;
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struct usb_ctrlrequest *change_request;
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};
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/* The control packet to send to wheel */
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static const struct usb_ctrlrequest model_request = {
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.bRequestType = 0xc1,
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.bRequest = 73,
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.wValue = 0,
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.wIndex = 0,
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.wLength = cpu_to_le16(0x0010)
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};
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static const struct usb_ctrlrequest change_request = {
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.bRequestType = 0x41,
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.bRequest = 83,
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.wValue = 0, // Will be filled by the driver
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.wIndex = 0,
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.wLength = 0
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};
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/*
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* On some setups initializing the T300RS crashes the kernel,
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* these interrupts fix that particular issue. So far they haven't caused any
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* adverse effects in other wheels.
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*/
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static void thrustmaster_interrupts(struct hid_device *hdev)
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{
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int ret, trans, i, b_ep;
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u8 *send_buf = kmalloc(256, GFP_KERNEL);
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struct usb_host_endpoint *ep;
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struct device *dev = &hdev->dev;
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struct usb_interface *usbif = to_usb_interface(dev->parent);
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struct usb_device *usbdev = interface_to_usbdev(usbif);
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if (!send_buf) {
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hid_err(hdev, "failed allocating send buffer\n");
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return;
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}
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if (usbif->cur_altsetting->desc.bNumEndpoints < 2) {
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kfree(send_buf);
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hid_err(hdev, "Wrong number of endpoints?\n");
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return;
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}
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ep = &usbif->cur_altsetting->endpoint[1];
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b_ep = ep->desc.bEndpointAddress;
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for (i = 0; i < ARRAY_SIZE(setup_arr); ++i) {
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memcpy(send_buf, setup_arr[i], setup_arr_sizes[i]);
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ret = usb_interrupt_msg(usbdev,
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usb_sndintpipe(usbdev, b_ep),
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send_buf,
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setup_arr_sizes[i],
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&trans,
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USB_CTRL_SET_TIMEOUT);
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if (ret) {
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hid_err(hdev, "setup data couldn't be sent\n");
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kfree(send_buf);
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return;
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}
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}
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kfree(send_buf);
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}
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static void thrustmaster_change_handler(struct urb *urb)
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{
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struct hid_device *hdev = urb->context;
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// The wheel seems to kill himself before answering the host and therefore is violating the USB protocol...
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if (urb->status == 0 || urb->status == -EPROTO || urb->status == -EPIPE)
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hid_info(hdev, "Success?! The wheel should have been initialized!\n");
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else
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hid_warn(hdev, "URB to change wheel mode seems to have failed with error %d\n", urb->status);
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}
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/*
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* Called by the USB subsystem when the wheel responses to our request
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* to get [what it seems to be] the wheel's model.
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*
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* If the model id is recognized then we send an opportune USB CONTROL REQUEST
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* to switch the wheel to its full capabilities
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*/
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static void thrustmaster_model_handler(struct urb *urb)
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{
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struct hid_device *hdev = urb->context;
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struct tm_wheel *tm_wheel = hid_get_drvdata(hdev);
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uint16_t model = 0;
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int i, ret;
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const struct tm_wheel_info *twi = NULL;
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if (urb->status) {
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hid_err(hdev, "URB to get model id failed with error %d\n", urb->status);
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return;
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}
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if (tm_wheel->response->type == cpu_to_le16(0x49))
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model = le16_to_cpu(tm_wheel->response->data.a.model);
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else if (tm_wheel->response->type == cpu_to_le16(0x47))
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model = le16_to_cpu(tm_wheel->response->data.b.model);
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else {
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hid_err(hdev, "Unknown packet type 0x%x, unable to proceed further with wheel init\n", tm_wheel->response->type);
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return;
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}
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for (i = 0; i < tm_wheels_infos_length && !twi; i++)
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if (tm_wheels_infos[i].wheel_type == model)
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twi = tm_wheels_infos + i;
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if (twi)
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hid_info(hdev, "Wheel with model id 0x%x is a %s\n", model, twi->wheel_name);
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else {
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hid_err(hdev, "Unknown wheel's model id 0x%x, unable to proceed further with wheel init\n", model);
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return;
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}
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tm_wheel->change_request->wValue = cpu_to_le16(twi->switch_value);
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usb_fill_control_urb(
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tm_wheel->urb,
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tm_wheel->usb_dev,
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usb_sndctrlpipe(tm_wheel->usb_dev, 0),
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(char *)tm_wheel->change_request,
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NULL, 0, // We do not expect any response from the wheel
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thrustmaster_change_handler,
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hdev
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);
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ret = usb_submit_urb(tm_wheel->urb, GFP_ATOMIC);
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if (ret)
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hid_err(hdev, "Error %d while submitting the change URB. I am unable to initialize this wheel...\n", ret);
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}
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static void thrustmaster_remove(struct hid_device *hdev)
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{
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struct tm_wheel *tm_wheel = hid_get_drvdata(hdev);
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usb_kill_urb(tm_wheel->urb);
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kfree(tm_wheel->change_request);
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kfree(tm_wheel->response);
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kfree(tm_wheel->model_request);
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usb_free_urb(tm_wheel->urb);
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kfree(tm_wheel);
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hid_hw_stop(hdev);
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}
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/*
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* Function called by HID when a hid Thrustmaster FFB wheel is connected to the host.
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* This function starts the hid dev, tries to allocate the tm_wheel data structure and
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* finally send an USB CONTROL REQUEST to the wheel to get [what it seems to be] its
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* model type.
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*/
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static int thrustmaster_probe(struct hid_device *hdev, const struct hid_device_id *id)
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{
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int ret = 0;
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struct tm_wheel *tm_wheel = NULL;
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if (!hid_is_usb(hdev))
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return -EINVAL;
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ret = hid_parse(hdev);
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if (ret) {
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hid_err(hdev, "parse failed with error %d\n", ret);
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goto error0;
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}
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ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF);
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if (ret) {
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hid_err(hdev, "hw start failed with error %d\n", ret);
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goto error0;
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}
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// Now we allocate the tm_wheel
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tm_wheel = kzalloc(sizeof(struct tm_wheel), GFP_KERNEL);
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if (!tm_wheel) {
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ret = -ENOMEM;
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goto error1;
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}
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tm_wheel->urb = usb_alloc_urb(0, GFP_ATOMIC);
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if (!tm_wheel->urb) {
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ret = -ENOMEM;
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goto error2;
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}
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tm_wheel->model_request = kmemdup(&model_request,
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sizeof(struct usb_ctrlrequest),
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GFP_KERNEL);
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if (!tm_wheel->model_request) {
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ret = -ENOMEM;
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goto error3;
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}
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tm_wheel->response = kzalloc(sizeof(struct tm_wheel_response), GFP_KERNEL);
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if (!tm_wheel->response) {
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ret = -ENOMEM;
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goto error4;
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}
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tm_wheel->change_request = kmemdup(&change_request,
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sizeof(struct usb_ctrlrequest),
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GFP_KERNEL);
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if (!tm_wheel->change_request) {
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ret = -ENOMEM;
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goto error5;
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}
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tm_wheel->usb_dev = interface_to_usbdev(to_usb_interface(hdev->dev.parent));
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hid_set_drvdata(hdev, tm_wheel);
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thrustmaster_interrupts(hdev);
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usb_fill_control_urb(
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tm_wheel->urb,
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tm_wheel->usb_dev,
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usb_rcvctrlpipe(tm_wheel->usb_dev, 0),
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(char *)tm_wheel->model_request,
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tm_wheel->response,
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sizeof(struct tm_wheel_response),
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thrustmaster_model_handler,
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hdev
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);
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ret = usb_submit_urb(tm_wheel->urb, GFP_ATOMIC);
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if (ret) {
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hid_err(hdev, "Error %d while submitting the URB. I am unable to initialize this wheel...\n", ret);
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goto error6;
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}
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return ret;
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error6: kfree(tm_wheel->change_request);
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error5: kfree(tm_wheel->response);
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error4: kfree(tm_wheel->model_request);
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error3: usb_free_urb(tm_wheel->urb);
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error2: kfree(tm_wheel);
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error1: hid_hw_stop(hdev);
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error0:
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return ret;
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}
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static const struct hid_device_id thrustmaster_devices[] = {
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{ HID_USB_DEVICE(0x044f, 0xb65d)},
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{}
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};
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MODULE_DEVICE_TABLE(hid, thrustmaster_devices);
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static struct hid_driver thrustmaster_driver = {
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.name = "hid-thrustmaster",
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.id_table = thrustmaster_devices,
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.probe = thrustmaster_probe,
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.remove = thrustmaster_remove,
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};
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module_hid_driver(thrustmaster_driver);
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MODULE_AUTHOR("Dario Pagani <dario.pagani.146+linuxk@gmail.com>");
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MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("Driver to initialize some steering wheel joysticks from Thrustmaster");
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