summaryrefslogtreecommitdiffstats
path: root/drivers/input/mouse/byd.c
blob: 6e0c5f5a2713daab794d97ef026a4b7eb5def42c (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
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
// SPDX-License-Identifier: GPL-2.0-only
/*
 * BYD TouchPad PS/2 mouse driver
 *
 * Copyright (C) 2015 Chris Diamand <chris@diamand.org>
 * Copyright (C) 2015 Richard Pospesel
 * Copyright (C) 2015 Tai Chi Minh Ralph Eastwood
 * Copyright (C) 2015 Martin Wimpress
 * Copyright (C) 2015 Jay Kuri
 */

#include <linux/delay.h>
#include <linux/input.h>
#include <linux/libps2.h>
#include <linux/serio.h>
#include <linux/slab.h>

#include "psmouse.h"
#include "byd.h"

/* PS2 Bits */
#define PS2_Y_OVERFLOW	BIT_MASK(7)
#define PS2_X_OVERFLOW	BIT_MASK(6)
#define PS2_Y_SIGN	BIT_MASK(5)
#define PS2_X_SIGN	BIT_MASK(4)
#define PS2_ALWAYS_1	BIT_MASK(3)
#define PS2_MIDDLE	BIT_MASK(2)
#define PS2_RIGHT	BIT_MASK(1)
#define PS2_LEFT	BIT_MASK(0)

/*
 * BYD pad constants
 */

/*
 * True device resolution is unknown, however experiments show the
 * resolution is about 111 units/mm.
 * Absolute coordinate packets are in the range 0-255 for both X and Y
 * we pick ABS_X/ABS_Y dimensions which are multiples of 256 and in
 * the right ballpark given the touchpad's physical dimensions and estimate
 * resolution per spec sheet, device active area dimensions are
 * 101.6 x 60.1 mm.
 */
#define BYD_PAD_WIDTH		11264
#define BYD_PAD_HEIGHT		6656
#define BYD_PAD_RESOLUTION	111

/*
 * Given the above dimensions, relative packets velocity is in multiples of
 * 1 unit / 11 milliseconds.  We use this dt to estimate distance traveled
 */
#define BYD_DT			11
/* Time in jiffies used to timeout various touch events (64 ms) */
#define BYD_TOUCH_TIMEOUT	msecs_to_jiffies(64)

/* BYD commands reverse engineered from windows driver */

/*
 * Swipe gesture from off-pad to on-pad
 *  0 : disable
 *  1 : enable
 */
#define BYD_CMD_SET_OFFSCREEN_SWIPE		0x10cc
/*
 * Tap and drag delay time
 *  0 : disable
 *  1 - 8 : least to most delay
 */
#define BYD_CMD_SET_TAP_DRAG_DELAY_TIME		0x10cf
/*
 * Physical buttons function mapping
 *  0 : enable
 *  4 : normal
 *  5 : left button custom command
 *  6 : right button custom command
 *  8 : disable
 */
#define BYD_CMD_SET_PHYSICAL_BUTTONS		0x10d0
/*
 * Absolute mode (1 byte X/Y resolution)
 *  0 : disable
 *  2 : enable
 */
#define BYD_CMD_SET_ABSOLUTE_MODE		0x10d1
/*
 * Two finger scrolling
 *  1 : vertical
 *  2 : horizontal
 *  3 : vertical + horizontal
 *  4 : disable
 */
#define BYD_CMD_SET_TWO_FINGER_SCROLL		0x10d2
/*
 * Handedness
 *  1 : right handed
 *  2 : left handed
 */
#define BYD_CMD_SET_HANDEDNESS			0x10d3
/*
 * Tap to click
 *  1 : enable
 *  2 : disable
 */
#define BYD_CMD_SET_TAP				0x10d4
/*
 * Tap and drag
 *  1 : tap and hold to drag
 *  2 : tap and hold to drag + lock
 *  3 : disable
 */
#define BYD_CMD_SET_TAP_DRAG			0x10d5
/*
 * Touch sensitivity
 *  1 - 7 : least to most sensitive
 */
#define BYD_CMD_SET_TOUCH_SENSITIVITY		0x10d6
/*
 * One finger scrolling
 *  1 : vertical
 *  2 : horizontal
 *  3 : vertical + horizontal
 *  4 : disable
 */
#define BYD_CMD_SET_ONE_FINGER_SCROLL		0x10d7
/*
 * One finger scrolling function
 *  1 : free scrolling
 *  2 : edge motion
 *  3 : free scrolling + edge motion
 *  4 : disable
 */
#define BYD_CMD_SET_ONE_FINGER_SCROLL_FUNC	0x10d8
/*
 * Sliding speed
 *  1 - 5 : slowest to fastest
 */
#define BYD_CMD_SET_SLIDING_SPEED		0x10da
/*
 * Edge motion
 *  1 : disable
 *  2 : enable when dragging
 *  3 : enable when dragging and pointing
 */
#define BYD_CMD_SET_EDGE_MOTION			0x10db
/*
 * Left edge region size
 *  0 - 7 : smallest to largest width
 */
#define BYD_CMD_SET_LEFT_EDGE_REGION		0x10dc
/*
 * Top edge region size
 *  0 - 9 : smallest to largest height
 */
#define BYD_CMD_SET_TOP_EDGE_REGION		0x10dd
/*
 * Disregard palm press as clicks
 *  1 - 6 : smallest to largest
 */
#define BYD_CMD_SET_PALM_CHECK			0x10de
/*
 * Right edge region size
 *  0 - 7 : smallest to largest width
 */
#define BYD_CMD_SET_RIGHT_EDGE_REGION		0x10df
/*
 * Bottom edge region size
 *  0 - 9 : smallest to largest height
 */
#define BYD_CMD_SET_BOTTOM_EDGE_REGION		0x10e1
/*
 * Multitouch gestures
 *  1 : enable
 *  2 : disable
 */
#define BYD_CMD_SET_MULTITOUCH			0x10e3
/*
 * Edge motion speed
 *  0 : control with finger pressure
 *  1 - 9 : slowest to fastest
 */
#define BYD_CMD_SET_EDGE_MOTION_SPEED		0x10e4
/*
 * Two finger scolling function
 *  0 : free scrolling
 *  1 : free scrolling (with momentum)
 *  2 : edge motion
 *  3 : free scrolling (with momentum) + edge motion
 *  4 : disable
 */
#define BYD_CMD_SET_TWO_FINGER_SCROLL_FUNC	0x10e5

/*
 * The touchpad generates a mixture of absolute and relative packets, indicated
 * by the the last byte of each packet being set to one of the following:
 */
#define BYD_PACKET_ABSOLUTE			0xf8
#define BYD_PACKET_RELATIVE			0x00
/* Multitouch gesture packets */
#define BYD_PACKET_PINCH_IN			0xd8
#define BYD_PACKET_PINCH_OUT			0x28
#define BYD_PACKET_ROTATE_CLOCKWISE		0x29
#define BYD_PACKET_ROTATE_ANTICLOCKWISE		0xd7
#define BYD_PACKET_TWO_FINGER_SCROLL_RIGHT	0x2a
#define BYD_PACKET_TWO_FINGER_SCROLL_DOWN	0x2b
#define BYD_PACKET_TWO_FINGER_SCROLL_UP		0xd5
#define BYD_PACKET_TWO_FINGER_SCROLL_LEFT	0xd6
#define BYD_PACKET_THREE_FINGER_SWIPE_RIGHT	0x2c
#define BYD_PACKET_THREE_FINGER_SWIPE_DOWN	0x2d
#define BYD_PACKET_THREE_FINGER_SWIPE_UP	0xd3
#define BYD_PACKET_THREE_FINGER_SWIPE_LEFT	0xd4
#define BYD_PACKET_FOUR_FINGER_DOWN		0x33
#define BYD_PACKET_FOUR_FINGER_UP		0xcd
#define BYD_PACKET_REGION_SCROLL_RIGHT		0x35
#define BYD_PACKET_REGION_SCROLL_DOWN		0x36
#define BYD_PACKET_REGION_SCROLL_UP		0xca
#define BYD_PACKET_REGION_SCROLL_LEFT		0xcb
#define BYD_PACKET_RIGHT_CORNER_CLICK		0xd2
#define BYD_PACKET_LEFT_CORNER_CLICK		0x2e
#define BYD_PACKET_LEFT_AND_RIGHT_CORNER_CLICK	0x2f
#define BYD_PACKET_ONTO_PAD_SWIPE_RIGHT		0x37
#define BYD_PACKET_ONTO_PAD_SWIPE_DOWN		0x30
#define BYD_PACKET_ONTO_PAD_SWIPE_UP		0xd0
#define BYD_PACKET_ONTO_PAD_SWIPE_LEFT		0xc9

struct byd_data {
	struct timer_list timer;
	struct psmouse *psmouse;
	s32 abs_x;
	s32 abs_y;
	typeof(jiffies) last_touch_time;
	bool btn_left;
	bool btn_right;
	bool touch;
};

static void byd_report_input(struct psmouse *psmouse)
{
	struct byd_data *priv = psmouse->private;
	struct input_dev *dev = psmouse->dev;

	input_report_key(dev, BTN_TOUCH, priv->touch);
	input_report_key(dev, BTN_TOOL_FINGER, priv->touch);

	input_report_abs(dev, ABS_X, priv->abs_x);
	input_report_abs(dev, ABS_Y, priv->abs_y);
	input_report_key(dev, BTN_LEFT, priv->btn_left);
	input_report_key(dev, BTN_RIGHT, priv->btn_right);

	input_sync(dev);
}

static void byd_clear_touch(struct timer_list *t)
{
	struct byd_data *priv = from_timer(priv, t, timer);
	struct psmouse *psmouse = priv->psmouse;

	serio_pause_rx(psmouse->ps2dev.serio);
	priv->touch = false;

	byd_report_input(psmouse);

	serio_continue_rx(psmouse->ps2dev.serio);

	/*
	 * Move cursor back to center of pad when we lose touch - this
	 * specifically improves user experience when moving cursor with one
	 * finger, and pressing a button with another.
	 */
	priv->abs_x = BYD_PAD_WIDTH / 2;
	priv->abs_y = BYD_PAD_HEIGHT / 2;
}

static psmouse_ret_t byd_process_byte(struct psmouse *psmouse)
{
	struct byd_data *priv = psmouse->private;
	u8 *pkt = psmouse->packet;

	if (psmouse->pktcnt > 0 && !(pkt[0] & PS2_ALWAYS_1)) {
		psmouse_warn(psmouse, "Always_1 bit not 1. pkt[0] = %02x\n",
			     pkt[0]);
		return PSMOUSE_BAD_DATA;
	}

	if (psmouse->pktcnt < psmouse->pktsize)
		return PSMOUSE_GOOD_DATA;

	/* Otherwise, a full packet has been received */
	switch (pkt[3]) {
	case BYD_PACKET_ABSOLUTE:
		/* Only use absolute packets for the start of movement. */
		if (!priv->touch) {
			/* needed to detect tap */
			typeof(jiffies) tap_time =
				priv->last_touch_time + BYD_TOUCH_TIMEOUT;
			priv->touch = time_after(jiffies, tap_time);

			/* init abs position */
			priv->abs_x = pkt[1] * (BYD_PAD_WIDTH / 256);
			priv->abs_y = (255 - pkt[2]) * (BYD_PAD_HEIGHT / 256);
		}
		break;
	case BYD_PACKET_RELATIVE: {
		/* Standard packet */
		/* Sign-extend if a sign bit is set. */
		u32 signx = pkt[0] & PS2_X_SIGN ? ~0xFF : 0;
		u32 signy = pkt[0] & PS2_Y_SIGN ? ~0xFF : 0;
		s32 dx = signx | (int) pkt[1];
		s32 dy = signy | (int) pkt[2];

		/* Update position based on velocity */
		priv->abs_x += dx * BYD_DT;
		priv->abs_y -= dy * BYD_DT;

		priv->touch = true;
		break;
	}
	default:
		psmouse_warn(psmouse,
			     "Unrecognized Z: pkt = %02x %02x %02x %02x\n",
			     psmouse->packet[0], psmouse->packet[1],
			     psmouse->packet[2], psmouse->packet[3]);
		return PSMOUSE_BAD_DATA;
	}

	priv->btn_left = pkt[0] & PS2_LEFT;
	priv->btn_right = pkt[0] & PS2_RIGHT;

	byd_report_input(psmouse);

	/* Reset time since last touch. */
	if (priv->touch) {
		priv->last_touch_time = jiffies;
		mod_timer(&priv->timer, jiffies + BYD_TOUCH_TIMEOUT);
	}

	return PSMOUSE_FULL_PACKET;
}

static int byd_reset_touchpad(struct psmouse *psmouse)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	u8 param[4];
	size_t i;

	static const struct {
		u16 command;
		u8 arg;
	} seq[] = {
		/*
		 * Intellimouse initialization sequence, to get 4-byte instead
		 * of 3-byte packets.
		 */
		{ PSMOUSE_CMD_SETRATE, 0xC8 },
		{ PSMOUSE_CMD_SETRATE, 0x64 },
		{ PSMOUSE_CMD_SETRATE, 0x50 },
		{ PSMOUSE_CMD_GETID, 0 },
		{ PSMOUSE_CMD_ENABLE, 0 },
		/*
		 * BYD-specific initialization, which enables absolute mode and
		 * (if desired), the touchpad's built-in gesture detection.
		 */
		{ 0x10E2, 0x00 },
		{ 0x10E0, 0x02 },
		/* The touchpad should reply with 4 seemingly-random bytes */
		{ 0x14E0, 0x01 },
		/* Pairs of parameters and values. */
		{ BYD_CMD_SET_HANDEDNESS, 0x01 },
		{ BYD_CMD_SET_PHYSICAL_BUTTONS, 0x04 },
		{ BYD_CMD_SET_TAP, 0x02 },
		{ BYD_CMD_SET_ONE_FINGER_SCROLL, 0x04 },
		{ BYD_CMD_SET_ONE_FINGER_SCROLL_FUNC, 0x04 },
		{ BYD_CMD_SET_EDGE_MOTION, 0x01 },
		{ BYD_CMD_SET_PALM_CHECK, 0x00 },
		{ BYD_CMD_SET_MULTITOUCH, 0x02 },
		{ BYD_CMD_SET_TWO_FINGER_SCROLL, 0x04 },
		{ BYD_CMD_SET_TWO_FINGER_SCROLL_FUNC, 0x04 },
		{ BYD_CMD_SET_LEFT_EDGE_REGION, 0x00 },
		{ BYD_CMD_SET_TOP_EDGE_REGION, 0x00 },
		{ BYD_CMD_SET_RIGHT_EDGE_REGION, 0x00 },
		{ BYD_CMD_SET_BOTTOM_EDGE_REGION, 0x00 },
		{ BYD_CMD_SET_ABSOLUTE_MODE, 0x02 },
		/* Finalize initialization. */
		{ 0x10E0, 0x00 },
		{ 0x10E2, 0x01 },
	};

	for (i = 0; i < ARRAY_SIZE(seq); ++i) {
		memset(param, 0, sizeof(param));
		param[0] = seq[i].arg;
		if (ps2_command(ps2dev, param, seq[i].command))
			return -EIO;
	}

	psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
	return 0;
}

static int byd_reconnect(struct psmouse *psmouse)
{
	int retry = 0, error = 0;

	psmouse_dbg(psmouse, "Reconnect\n");
	do {
		psmouse_reset(psmouse);
		if (retry)
			ssleep(1);
		error = byd_detect(psmouse, 0);
	} while (error && ++retry < 3);

	if (error)
		return error;

	psmouse_dbg(psmouse, "Reconnected after %d attempts\n", retry);

	error = byd_reset_touchpad(psmouse);
	if (error) {
		psmouse_err(psmouse, "Unable to initialize device\n");
		return error;
	}

	return 0;
}

static void byd_disconnect(struct psmouse *psmouse)
{
	struct byd_data *priv = psmouse->private;

	if (priv) {
		del_timer(&priv->timer);
		kfree(psmouse->private);
		psmouse->private = NULL;
	}
}

int byd_detect(struct psmouse *psmouse, bool set_properties)
{
	struct ps2dev *ps2dev = &psmouse->ps2dev;
	u8 param[4] = {0x03, 0x00, 0x00, 0x00};

	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
		return -1;
	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
		return -1;
	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
		return -1;
	if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
		return -1;
	if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
		return -1;

	if (param[1] != 0x03 || param[2] != 0x64)
		return -ENODEV;

	psmouse_dbg(psmouse, "BYD touchpad detected\n");

	if (set_properties) {
		psmouse->vendor = "BYD";
		psmouse->name = "TouchPad";
	}

	return 0;
}

int byd_init(struct psmouse *psmouse)
{
	struct input_dev *dev = psmouse->dev;
	struct byd_data *priv;

	if (psmouse_reset(psmouse))
		return -EIO;

	if (byd_reset_touchpad(psmouse))
		return -EIO;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->psmouse = psmouse;
	timer_setup(&priv->timer, byd_clear_touch, 0);

	psmouse->private = priv;
	psmouse->disconnect = byd_disconnect;
	psmouse->reconnect = byd_reconnect;
	psmouse->protocol_handler = byd_process_byte;
	psmouse->pktsize = 4;
	psmouse->resync_time = 0;

	__set_bit(INPUT_PROP_POINTER, dev->propbit);
	/* Touchpad */
	__set_bit(BTN_TOUCH, dev->keybit);
	__set_bit(BTN_TOOL_FINGER, dev->keybit);
	/* Buttons */
	__set_bit(BTN_LEFT, dev->keybit);
	__set_bit(BTN_RIGHT, dev->keybit);
	__clear_bit(BTN_MIDDLE, dev->keybit);

	/* Absolute position */
	__set_bit(EV_ABS, dev->evbit);
	input_set_abs_params(dev, ABS_X, 0, BYD_PAD_WIDTH, 0, 0);
	input_set_abs_params(dev, ABS_Y, 0, BYD_PAD_HEIGHT, 0, 0);
	input_abs_set_res(dev, ABS_X, BYD_PAD_RESOLUTION);
	input_abs_set_res(dev, ABS_Y, BYD_PAD_RESOLUTION);
	/* No relative support */
	__clear_bit(EV_REL, dev->evbit);
	__clear_bit(REL_X, dev->relbit);
	__clear_bit(REL_Y, dev->relbit);

	return 0;
}