summaryrefslogtreecommitdiffstats
path: root/drivers/hid/hid-thrustmaster.c
blob: 03b935ff02d5616f67e3287ceeb0dc9926703429 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
// 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 = 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 <dario.pagani.146+linuxk@gmail.com>");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Driver to initialize some steering wheel joysticks from Thrustmaster");