aboutsummaryrefslogtreecommitdiff
path: root/drivers/hid/hid-udraw-ps3.c
blob: b2e17ef2ea275e7ff51a1c109ab795a78a9ac2eb (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
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
// SPDX-License-Identifier: GPL-2.0-only
/*
 * HID driver for THQ PS3 uDraw tablet
 *
 * Copyright (C) 2016 Red Hat Inc. All Rights Reserved
 */

#include <linux/device.h>
#include <linux/hid.h>
#include <linux/module.h>
#include "hid-ids.h"

MODULE_AUTHOR("Bastien Nocera <hadess@hadess.net>");
MODULE_DESCRIPTION("PS3 uDraw tablet driver");
MODULE_LICENSE("GPL");

/*
 * Protocol information from:
 * https://brandonw.net/udraw/
 * and the source code of:
 * https://vvvv.org/contribution/udraw-hid
 */

/*
 * The device is setup with multiple input devices:
 * - the touch area which works as a touchpad
 * - the tablet area which works as a touchpad/drawing tablet
 * - a joypad with a d-pad, and 7 buttons
 * - an accelerometer device
 */

enum {
	TOUCH_NONE,
	TOUCH_PEN,
	TOUCH_FINGER,
	TOUCH_TWOFINGER
};

enum {
	AXIS_X,
	AXIS_Y,
	AXIS_Z
};

/*
 * Accelerometer min/max values
 * in order, X, Y and Z
 */
static struct {
	int min;
	int max;
} accel_limits[] = {
	[AXIS_X] = { 490, 534 },
	[AXIS_Y] = { 490, 534 },
	[AXIS_Z] = { 492, 536 }
};

#define DEVICE_NAME "THQ uDraw Game Tablet for PS3"
/* resolution in pixels */
#define RES_X 1920
#define RES_Y 1080
/* size in mm */
#define WIDTH  160
#define HEIGHT 90
#define PRESSURE_OFFSET 113
#define MAX_PRESSURE (255 - PRESSURE_OFFSET)

struct udraw {
	struct input_dev *joy_input_dev;
	struct input_dev *touch_input_dev;
	struct input_dev *pen_input_dev;
	struct input_dev *accel_input_dev;
	struct hid_device *hdev;

	/*
	 * The device's two-finger support is pretty unreliable, as
	 * the device could report a single touch when the two fingers
	 * are too close together, and the distance between fingers, even
	 * though reported is not in the same unit as the touches.
	 *
	 * We'll make do without it, and try to report the first touch
	 * as reliably as possible.
	 */
	int last_one_finger_x;
	int last_one_finger_y;
	int last_two_finger_x;
	int last_two_finger_y;
};

static int clamp_accel(int axis, int offset)
{
	axis = clamp(axis,
			accel_limits[offset].min,
			accel_limits[offset].max);
	axis = (axis - accel_limits[offset].min) /
			((accel_limits[offset].max -
			  accel_limits[offset].min) * 0xFF);
	return axis;
}

static int udraw_raw_event(struct hid_device *hdev, struct hid_report *report,
	 u8 *data, int len)
{
	struct udraw *udraw = hid_get_drvdata(hdev);
	int touch;
	int x, y, z;

	if (len != 27)
		return 0;

	if (data[11] == 0x00)
		touch = TOUCH_NONE;
	else if (data[11] == 0x40)
		touch = TOUCH_PEN;
	else if (data[11] == 0x80)
		touch = TOUCH_FINGER;
	else
		touch = TOUCH_TWOFINGER;

	/* joypad */
	input_report_key(udraw->joy_input_dev, BTN_WEST, data[0] & 1);
	input_report_key(udraw->joy_input_dev, BTN_SOUTH, !!(data[0] & 2));
	input_report_key(udraw->joy_input_dev, BTN_EAST, !!(data[0] & 4));
	input_report_key(udraw->joy_input_dev, BTN_NORTH, !!(data[0] & 8));

	input_report_key(udraw->joy_input_dev, BTN_SELECT, !!(data[1] & 1));
	input_report_key(udraw->joy_input_dev, BTN_START, !!(data[1] & 2));
	input_report_key(udraw->joy_input_dev, BTN_MODE, !!(data[1] & 16));

	x = y = 0;
	switch (data[2]) {
	case 0x0:
		y = -127;
		break;
	case 0x1:
		y = -127;
		x = 127;
		break;
	case 0x2:
		x = 127;
		break;
	case 0x3:
		y = 127;
		x = 127;
		break;
	case 0x4:
		y = 127;
		break;
	case 0x5:
		y = 127;
		x = -127;
		break;
	case 0x6:
		x = -127;
		break;
	case 0x7:
		y = -127;
		x = -127;
		break;
	default:
		break;
	}

	input_report_abs(udraw->joy_input_dev, ABS_X, x);
	input_report_abs(udraw->joy_input_dev, ABS_Y, y);

	input_sync(udraw->joy_input_dev);

	/* For pen and touchpad */
	x = y = 0;
	if (touch != TOUCH_NONE) {
		if (data[15] != 0x0F)
			x = data[15] * 256 + data[17];
		if (data[16] != 0x0F)
			y = data[16] * 256 + data[18];
	}

	if (touch == TOUCH_FINGER) {
		/* Save the last one-finger touch */
		udraw->last_one_finger_x = x;
		udraw->last_one_finger_y = y;
		udraw->last_two_finger_x = -1;
		udraw->last_two_finger_y = -1;
	} else if (touch == TOUCH_TWOFINGER) {
		/*
		 * We have a problem because x/y is the one for the
		 * second finger but we want the first finger given
		 * to user-space otherwise it'll look as if it jumped.
		 *
		 * See the udraw struct definition for why this was
		 * implemented this way.
		 */
		if (udraw->last_two_finger_x == -1) {
			/* Save the position of the 2nd finger */
			udraw->last_two_finger_x = x;
			udraw->last_two_finger_y = y;

			x = udraw->last_one_finger_x;
			y = udraw->last_one_finger_y;
		} else {
			/*
			 * Offset the 2-finger coords using the
			 * saved data from the first finger
			 */
			x = x - (udraw->last_two_finger_x
				- udraw->last_one_finger_x);
			y = y - (udraw->last_two_finger_y
				- udraw->last_one_finger_y);
		}
	}

	/* touchpad */
	if (touch == TOUCH_FINGER || touch == TOUCH_TWOFINGER) {
		input_report_key(udraw->touch_input_dev, BTN_TOUCH, 1);
		input_report_key(udraw->touch_input_dev, BTN_TOOL_FINGER,
				touch == TOUCH_FINGER);
		input_report_key(udraw->touch_input_dev, BTN_TOOL_DOUBLETAP,
				touch == TOUCH_TWOFINGER);

		input_report_abs(udraw->touch_input_dev, ABS_X, x);
		input_report_abs(udraw->touch_input_dev, ABS_Y, y);
	} else {
		input_report_key(udraw->touch_input_dev, BTN_TOUCH, 0);
		input_report_key(udraw->touch_input_dev, BTN_TOOL_FINGER, 0);
		input_report_key(udraw->touch_input_dev, BTN_TOOL_DOUBLETAP, 0);
	}
	input_sync(udraw->touch_input_dev);

	/* pen */
	if (touch == TOUCH_PEN) {
		int level;

		level = clamp(data[13] - PRESSURE_OFFSET,
				0, MAX_PRESSURE);

		input_report_key(udraw->pen_input_dev, BTN_TOUCH, (level != 0));
		input_report_key(udraw->pen_input_dev, BTN_TOOL_PEN, 1);
		input_report_abs(udraw->pen_input_dev, ABS_PRESSURE, level);
		input_report_abs(udraw->pen_input_dev, ABS_X, x);
		input_report_abs(udraw->pen_input_dev, ABS_Y, y);
	} else {
		input_report_key(udraw->pen_input_dev, BTN_TOUCH, 0);
		input_report_key(udraw->pen_input_dev, BTN_TOOL_PEN, 0);
		input_report_abs(udraw->pen_input_dev, ABS_PRESSURE, 0);
	}
	input_sync(udraw->pen_input_dev);

	/* accel */
	x = (data[19] + (data[20] << 8));
	x = clamp_accel(x, AXIS_X);
	y = (data[21] + (data[22] << 8));
	y = clamp_accel(y, AXIS_Y);
	z = (data[23] + (data[24] << 8));
	z = clamp_accel(z, AXIS_Z);
	input_report_abs(udraw->accel_input_dev, ABS_X, x);
	input_report_abs(udraw->accel_input_dev, ABS_Y, y);
	input_report_abs(udraw->accel_input_dev, ABS_Z, z);
	input_sync(udraw->accel_input_dev);

	/* let hidraw and hiddev handle the report */
	return 0;
}

static int udraw_open(struct input_dev *dev)
{
	struct udraw *udraw = input_get_drvdata(dev);

	return hid_hw_open(udraw->hdev);
}

static void udraw_close(struct input_dev *dev)
{
	struct udraw *udraw = input_get_drvdata(dev);

	hid_hw_close(udraw->hdev);
}

static struct input_dev *allocate_and_setup(struct hid_device *hdev,
		const char *name)
{
	struct input_dev *input_dev;

	input_dev = devm_input_allocate_device(&hdev->dev);
	if (!input_dev)
		return NULL;

	input_dev->name = name;
	input_dev->phys = hdev->phys;
	input_dev->dev.parent = &hdev->dev;
	input_dev->open = udraw_open;
	input_dev->close = udraw_close;
	input_dev->uniq = hdev->uniq;
	input_dev->id.bustype = hdev->bus;
	input_dev->id.vendor  = hdev->vendor;
	input_dev->id.product = hdev->product;
	input_dev->id.version = hdev->version;
	input_set_drvdata(input_dev, hid_get_drvdata(hdev));

	return input_dev;
}

static bool udraw_setup_touch(struct udraw *udraw,
		struct hid_device *hdev)
{
	struct input_dev *input_dev;

	input_dev = allocate_and_setup(hdev, DEVICE_NAME " Touchpad");
	if (!input_dev)
		return false;

	input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);

	input_set_abs_params(input_dev, ABS_X, 0, RES_X, 1, 0);
	input_abs_set_res(input_dev, ABS_X, RES_X / WIDTH);
	input_set_abs_params(input_dev, ABS_Y, 0, RES_Y, 1, 0);
	input_abs_set_res(input_dev, ABS_Y, RES_Y / HEIGHT);

	set_bit(BTN_TOUCH, input_dev->keybit);
	set_bit(BTN_TOOL_FINGER, input_dev->keybit);
	set_bit(BTN_TOOL_DOUBLETAP, input_dev->keybit);

	set_bit(INPUT_PROP_POINTER, input_dev->propbit);

	udraw->touch_input_dev = input_dev;

	return true;
}

static bool udraw_setup_pen(struct udraw *udraw,
		struct hid_device *hdev)
{
	struct input_dev *input_dev;

	input_dev = allocate_and_setup(hdev, DEVICE_NAME " Pen");
	if (!input_dev)
		return false;

	input_dev->evbit[0] = BIT(EV_ABS) | BIT(EV_KEY);

	input_set_abs_params(input_dev, ABS_X, 0, RES_X, 1, 0);
	input_abs_set_res(input_dev, ABS_X, RES_X / WIDTH);
	input_set_abs_params(input_dev, ABS_Y, 0, RES_Y, 1, 0);
	input_abs_set_res(input_dev, ABS_Y, RES_Y / HEIGHT);
	input_set_abs_params(input_dev, ABS_PRESSURE,
			0, MAX_PRESSURE, 0, 0);

	set_bit(BTN_TOUCH, input_dev->keybit);
	set_bit(BTN_TOOL_PEN, input_dev->keybit);

	set_bit(INPUT_PROP_POINTER, input_dev->propbit);

	udraw->pen_input_dev = input_dev;

	return true;
}

static bool udraw_setup_accel(struct udraw *udraw,
		struct hid_device *hdev)
{
	struct input_dev *input_dev;

	input_dev = allocate_and_setup(hdev, DEVICE_NAME " Accelerometer");
	if (!input_dev)
		return false;

	input_dev->evbit[0] = BIT(EV_ABS);

	/* 1G accel is reported as ~256, so clamp to 2G */
	input_set_abs_params(input_dev, ABS_X, -512, 512, 0, 0);
	input_set_abs_params(input_dev, ABS_Y, -512, 512, 0, 0);
	input_set_abs_params(input_dev, ABS_Z, -512, 512, 0, 0);

	set_bit(INPUT_PROP_ACCELEROMETER, input_dev->propbit);

	udraw->accel_input_dev = input_dev;

	return true;
}

static bool udraw_setup_joypad(struct udraw *udraw,
		struct hid_device *hdev)
{
	struct input_dev *input_dev;

	input_dev = allocate_and_setup(hdev, DEVICE_NAME " Joypad");
	if (!input_dev)
		return false;

	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);

	set_bit(BTN_SOUTH, input_dev->keybit);
	set_bit(BTN_NORTH, input_dev->keybit);
	set_bit(BTN_EAST, input_dev->keybit);
	set_bit(BTN_WEST, input_dev->keybit);
	set_bit(BTN_SELECT, input_dev->keybit);
	set_bit(BTN_START, input_dev->keybit);
	set_bit(BTN_MODE, input_dev->keybit);

	input_set_abs_params(input_dev, ABS_X, -127, 127, 0, 0);
	input_set_abs_params(input_dev, ABS_Y, -127, 127, 0, 0);

	udraw->joy_input_dev = input_dev;

	return true;
}

static int udraw_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
	struct udraw *udraw;
	int ret;

	udraw = devm_kzalloc(&hdev->dev, sizeof(struct udraw), GFP_KERNEL);
	if (!udraw)
		return -ENOMEM;

	udraw->hdev = hdev;
	udraw->last_two_finger_x = -1;
	udraw->last_two_finger_y = -1;

	hid_set_drvdata(hdev, udraw);

	ret = hid_parse(hdev);
	if (ret) {
		hid_err(hdev, "parse failed\n");
		return ret;
	}

	if (!udraw_setup_joypad(udraw, hdev) ||
	    !udraw_setup_touch(udraw, hdev) ||
	    !udraw_setup_pen(udraw, hdev) ||
	    !udraw_setup_accel(udraw, hdev)) {
		hid_err(hdev, "could not allocate interfaces\n");
		return -ENOMEM;
	}

	ret = input_register_device(udraw->joy_input_dev) ||
		input_register_device(udraw->touch_input_dev) ||
		input_register_device(udraw->pen_input_dev) ||
		input_register_device(udraw->accel_input_dev);
	if (ret) {
		hid_err(hdev, "failed to register interfaces\n");
		return ret;
	}

	ret = hid_hw_start(hdev, HID_CONNECT_HIDRAW | HID_CONNECT_DRIVER);
	if (ret) {
		hid_err(hdev, "hw start failed\n");
		return ret;
	}

	return 0;
}

static const struct hid_device_id udraw_devices[] = {
	{ HID_USB_DEVICE(USB_VENDOR_ID_THQ, USB_DEVICE_ID_THQ_PS3_UDRAW) },
	{ }
};
MODULE_DEVICE_TABLE(hid, udraw_devices);

static struct hid_driver udraw_driver = {
	.name = "hid-udraw",
	.id_table = udraw_devices,
	.raw_event = udraw_raw_event,
	.probe = udraw_probe,
};
module_hid_driver(udraw_driver);