1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * When connected to the machine, the Thrustmaster wheels appear as 4 * a «generic» hid gamepad called "Thrustmaster FFB Wheel". 5 * 6 * When in this mode not every functionality of the wheel, like the force feedback, 7 * are available. To enable all functionalities of a Thrustmaster wheel we have to send 8 * to it a specific USB CONTROL request with a code different for each wheel. 9 * 10 * This driver tries to understand which model of Thrustmaster wheel the generic 11 * "Thrustmaster FFB Wheel" really is and then sends the appropriate control code. 12 * 13 * Copyright (c) 2020-2021 Dario Pagani <dario.pagani.146+linuxk@gmail.com> 14 * Copyright (c) 2020-2021 Kim Kuparinen <kimi.h.kuparinen@gmail.com> 15 */ 16 #include <linux/hid.h> 17 #include <linux/usb.h> 18 #include <linux/input.h> 19 #include <linux/slab.h> 20 #include <linux/module.h> 21 22 /* 23 * These interrupts are used to prevent a nasty crash when initializing the 24 * T300RS. Used in thrustmaster_interrupts(). 25 */ 26 static const u8 setup_0[] = { 0x42, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; 27 static const u8 setup_1[] = { 0x0a, 0x04, 0x90, 0x03, 0x00, 0x00, 0x00, 0x00 }; 28 static const u8 setup_2[] = { 0x0a, 0x04, 0x00, 0x0c, 0x00, 0x00, 0x00, 0x00 }; 29 static const u8 setup_3[] = { 0x0a, 0x04, 0x12, 0x10, 0x00, 0x00, 0x00, 0x00 }; 30 static const u8 setup_4[] = { 0x0a, 0x04, 0x00, 0x06, 0x00, 0x00, 0x00, 0x00 }; 31 static const u8 *const setup_arr[] = { setup_0, setup_1, setup_2, setup_3, setup_4 }; 32 static const unsigned int setup_arr_sizes[] = { 33 ARRAY_SIZE(setup_0), 34 ARRAY_SIZE(setup_1), 35 ARRAY_SIZE(setup_2), 36 ARRAY_SIZE(setup_3), 37 ARRAY_SIZE(setup_4) 38 }; 39 /* 40 * This struct contains for each type of 41 * Thrustmaster wheel 42 * 43 * Note: The values are stored in the CPU 44 * endianness, the USB protocols always use 45 * little endian; the macro cpu_to_le[BIT]() 46 * must be used when preparing USB packets 47 * and vice-versa 48 */ 49 struct tm_wheel_info { 50 uint16_t wheel_type; 51 52 /* 53 * See when the USB control out packet is prepared... 54 * @TODO The TMX seems to require multiple control codes to switch. 55 */ 56 uint16_t switch_value; 57 58 char const *const wheel_name; 59 }; 60 61 /* 62 * Known wheels. 63 * Note: TMX does not work as it requires 2 control packets 64 */ 65 static const struct tm_wheel_info tm_wheels_infos[] = { 66 {0x0306, 0x0006, "Thrustmaster T150RS"}, 67 {0x0206, 0x0005, "Thrustmaster T300RS"}, 68 {0x0204, 0x0005, "Thrustmaster T300 Ferrari Alcantara Edition"}, 69 {0x0002, 0x0002, "Thrustmaster T500RS"} 70 //{0x0407, 0x0001, "Thrustmaster TMX"} 71 }; 72 73 static const uint8_t tm_wheels_infos_length = 4; 74 75 /* 76 * This structs contains (in little endian) the response data 77 * of the wheel to the request 73 78 * 79 * A sufficient research to understand what each field does is not 80 * beign conducted yet. The position and meaning of fields are a 81 * just a very optimistic guess based on instinct.... 82 */ 83 struct __packed tm_wheel_response 84 { 85 /* 86 * Seems to be the type of packet 87 * - 0x0049 if is data.a (15 bytes) 88 * - 0x0047 if is data.b (7 bytes) 89 */ 90 uint16_t type; 91 92 union { 93 struct __packed { 94 uint16_t field0; 95 uint16_t field1; 96 /* 97 * Seems to be the model code of the wheel 98 * Read table thrustmaster_wheels to values 99 */ 100 uint16_t model; 101 102 uint16_t field2; 103 uint16_t field3; 104 uint16_t field4; 105 uint16_t field5; 106 } a; 107 struct __packed { 108 uint16_t field0; 109 uint16_t field1; 110 uint16_t model; 111 } b; 112 } data; 113 }; 114 115 struct tm_wheel { 116 struct usb_device *usb_dev; 117 struct urb *urb; 118 119 struct usb_ctrlrequest *model_request; 120 struct tm_wheel_response *response; 121 122 struct usb_ctrlrequest *change_request; 123 }; 124 125 /* The control packet to send to wheel */ 126 static const struct usb_ctrlrequest model_request = { 127 .bRequestType = 0xc1, 128 .bRequest = 73, 129 .wValue = 0, 130 .wIndex = 0, 131 .wLength = cpu_to_le16(0x0010) 132 }; 133 134 static const struct usb_ctrlrequest change_request = { 135 .bRequestType = 0x41, 136 .bRequest = 83, 137 .wValue = 0, // Will be filled by the driver 138 .wIndex = 0, 139 .wLength = 0 140 }; 141 142 /* 143 * On some setups initializing the T300RS crashes the kernel, 144 * these interrupts fix that particular issue. So far they haven't caused any 145 * adverse effects in other wheels. 146 */ 147 static void thrustmaster_interrupts(struct hid_device *hdev) 148 { 149 int ret, trans, i, b_ep; 150 u8 *send_buf = kmalloc(256, GFP_KERNEL); 151 struct usb_host_endpoint *ep; 152 struct device *dev = &hdev->dev; 153 struct usb_interface *usbif = to_usb_interface(dev->parent); 154 struct usb_device *usbdev = interface_to_usbdev(usbif); 155 156 if (!send_buf) { 157 hid_err(hdev, "failed allocating send buffer\n"); 158 return; 159 } 160 161 ep = &usbif->cur_altsetting->endpoint[1]; 162 b_ep = ep->desc.bEndpointAddress; 163 164 for (i = 0; i < ARRAY_SIZE(setup_arr); ++i) { 165 memcpy(send_buf, setup_arr[i], setup_arr_sizes[i]); 166 167 ret = usb_interrupt_msg(usbdev, 168 usb_sndintpipe(usbdev, b_ep), 169 send_buf, 170 setup_arr_sizes[i], 171 &trans, 172 USB_CTRL_SET_TIMEOUT); 173 174 if (ret) { 175 hid_err(hdev, "setup data couldn't be sent\n"); 176 kfree(send_buf); 177 return; 178 } 179 } 180 181 kfree(send_buf); 182 } 183 184 static void thrustmaster_change_handler(struct urb *urb) 185 { 186 struct hid_device *hdev = urb->context; 187 188 // The wheel seems to kill himself before answering the host and therefore is violating the USB protocol... 189 if (urb->status == 0 || urb->status == -EPROTO || urb->status == -EPIPE) 190 hid_info(hdev, "Success?! The wheel should have been initialized!\n"); 191 else 192 hid_warn(hdev, "URB to change wheel mode seems to have failed with error %d\n", urb->status); 193 } 194 195 /* 196 * Called by the USB subsystem when the wheel responses to our request 197 * to get [what it seems to be] the wheel's model. 198 * 199 * If the model id is recognized then we send an opportune USB CONTROL REQUEST 200 * to switch the wheel to its full capabilities 201 */ 202 static void thrustmaster_model_handler(struct urb *urb) 203 { 204 struct hid_device *hdev = urb->context; 205 struct tm_wheel *tm_wheel = hid_get_drvdata(hdev); 206 uint16_t model = 0; 207 int i, ret; 208 const struct tm_wheel_info *twi = 0; 209 210 if (urb->status) { 211 hid_err(hdev, "URB to get model id failed with error %d\n", urb->status); 212 return; 213 } 214 215 if (tm_wheel->response->type == cpu_to_le16(0x49)) 216 model = le16_to_cpu(tm_wheel->response->data.a.model); 217 else if (tm_wheel->response->type == cpu_to_le16(0x47)) 218 model = le16_to_cpu(tm_wheel->response->data.b.model); 219 else { 220 hid_err(hdev, "Unknown packet type 0x%x, unable to proceed further with wheel init\n", tm_wheel->response->type); 221 return; 222 } 223 224 for (i = 0; i < tm_wheels_infos_length && !twi; i++) 225 if (tm_wheels_infos[i].wheel_type == model) 226 twi = tm_wheels_infos + i; 227 228 if (twi) 229 hid_info(hdev, "Wheel with model id 0x%x is a %s\n", model, twi->wheel_name); 230 else { 231 hid_err(hdev, "Unknown wheel's model id 0x%x, unable to proceed further with wheel init\n", model); 232 return; 233 } 234 235 tm_wheel->change_request->wValue = cpu_to_le16(twi->switch_value); 236 usb_fill_control_urb( 237 tm_wheel->urb, 238 tm_wheel->usb_dev, 239 usb_sndctrlpipe(tm_wheel->usb_dev, 0), 240 (char *)tm_wheel->change_request, 241 0, 0, // We do not expect any response from the wheel 242 thrustmaster_change_handler, 243 hdev 244 ); 245 246 ret = usb_submit_urb(tm_wheel->urb, GFP_ATOMIC); 247 if (ret) 248 hid_err(hdev, "Error %d while submitting the change URB. I am unable to initialize this wheel...\n", ret); 249 } 250 251 static void thrustmaster_remove(struct hid_device *hdev) 252 { 253 struct tm_wheel *tm_wheel = hid_get_drvdata(hdev); 254 255 usb_kill_urb(tm_wheel->urb); 256 257 kfree(tm_wheel->change_request); 258 kfree(tm_wheel->response); 259 kfree(tm_wheel->model_request); 260 usb_free_urb(tm_wheel->urb); 261 kfree(tm_wheel); 262 263 hid_hw_stop(hdev); 264 } 265 266 /* 267 * Function called by HID when a hid Thrustmaster FFB wheel is connected to the host. 268 * This function starts the hid dev, tries to allocate the tm_wheel data structure and 269 * finally send an USB CONTROL REQUEST to the wheel to get [what it seems to be] its 270 * model type. 271 */ 272 static int thrustmaster_probe(struct hid_device *hdev, const struct hid_device_id *id) 273 { 274 int ret = 0; 275 struct tm_wheel *tm_wheel = 0; 276 277 ret = hid_parse(hdev); 278 if (ret) { 279 hid_err(hdev, "parse failed with error %d\n", ret); 280 goto error0; 281 } 282 283 ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT & ~HID_CONNECT_FF); 284 if (ret) { 285 hid_err(hdev, "hw start failed with error %d\n", ret); 286 goto error0; 287 } 288 289 // Now we allocate the tm_wheel 290 tm_wheel = kzalloc(sizeof(struct tm_wheel), GFP_KERNEL); 291 if (!tm_wheel) { 292 ret = -ENOMEM; 293 goto error1; 294 } 295 296 tm_wheel->urb = usb_alloc_urb(0, GFP_ATOMIC); 297 if (!tm_wheel->urb) { 298 ret = -ENOMEM; 299 goto error2; 300 } 301 302 tm_wheel->model_request = kmemdup(&model_request, 303 sizeof(struct usb_ctrlrequest), 304 GFP_KERNEL); 305 if (!tm_wheel->model_request) { 306 ret = -ENOMEM; 307 goto error3; 308 } 309 310 tm_wheel->response = kzalloc(sizeof(struct tm_wheel_response), GFP_KERNEL); 311 if (!tm_wheel->response) { 312 ret = -ENOMEM; 313 goto error4; 314 } 315 316 tm_wheel->change_request = kmemdup(&change_request, 317 sizeof(struct usb_ctrlrequest), 318 GFP_KERNEL); 319 if (!tm_wheel->change_request) { 320 ret = -ENOMEM; 321 goto error5; 322 } 323 324 tm_wheel->usb_dev = interface_to_usbdev(to_usb_interface(hdev->dev.parent)); 325 hid_set_drvdata(hdev, tm_wheel); 326 327 thrustmaster_interrupts(hdev); 328 329 usb_fill_control_urb( 330 tm_wheel->urb, 331 tm_wheel->usb_dev, 332 usb_rcvctrlpipe(tm_wheel->usb_dev, 0), 333 (char *)tm_wheel->model_request, 334 tm_wheel->response, 335 sizeof(struct tm_wheel_response), 336 thrustmaster_model_handler, 337 hdev 338 ); 339 340 ret = usb_submit_urb(tm_wheel->urb, GFP_ATOMIC); 341 if (ret) { 342 hid_err(hdev, "Error %d while submitting the URB. I am unable to initialize this wheel...\n", ret); 343 goto error6; 344 } 345 346 return ret; 347 348 error6: kfree(tm_wheel->change_request); 349 error5: kfree(tm_wheel->response); 350 error4: kfree(tm_wheel->model_request); 351 error3: usb_free_urb(tm_wheel->urb); 352 error2: kfree(tm_wheel); 353 error1: hid_hw_stop(hdev); 354 error0: 355 return ret; 356 } 357 358 static const struct hid_device_id thrustmaster_devices[] = { 359 { HID_USB_DEVICE(0x044f, 0xb65d)}, 360 {} 361 }; 362 363 MODULE_DEVICE_TABLE(hid, thrustmaster_devices); 364 365 static struct hid_driver thrustmaster_driver = { 366 .name = "hid-thrustmaster", 367 .id_table = thrustmaster_devices, 368 .probe = thrustmaster_probe, 369 .remove = thrustmaster_remove, 370 }; 371 372 module_hid_driver(thrustmaster_driver); 373 374 MODULE_AUTHOR("Dario Pagani <dario.pagani.146+linuxk@gmail.com>"); 375 MODULE_LICENSE("GPL"); 376 MODULE_DESCRIPTION("Driver to initialize some steering wheel joysticks from Thrustmaster"); 377 378