1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * BYD TouchPad PS/2 mouse driver
4 *
5 * Copyright (C) 2015 Chris Diamand <chris@diamand.org>
6 * Copyright (C) 2015 Richard Pospesel
7 * Copyright (C) 2015 Tai Chi Minh Ralph Eastwood
8 * Copyright (C) 2015 Martin Wimpress
9 * Copyright (C) 2015 Jay Kuri
10 */
11
12 #include <linux/delay.h>
13 #include <linux/input.h>
14 #include <linux/libps2.h>
15 #include <linux/serio.h>
16 #include <linux/slab.h>
17
18 #include "psmouse.h"
19 #include "byd.h"
20
21 /* PS2 Bits */
22 #define PS2_Y_OVERFLOW BIT_MASK(7)
23 #define PS2_X_OVERFLOW BIT_MASK(6)
24 #define PS2_Y_SIGN BIT_MASK(5)
25 #define PS2_X_SIGN BIT_MASK(4)
26 #define PS2_ALWAYS_1 BIT_MASK(3)
27 #define PS2_MIDDLE BIT_MASK(2)
28 #define PS2_RIGHT BIT_MASK(1)
29 #define PS2_LEFT BIT_MASK(0)
30
31 /*
32 * BYD pad constants
33 */
34
35 /*
36 * True device resolution is unknown, however experiments show the
37 * resolution is about 111 units/mm.
38 * Absolute coordinate packets are in the range 0-255 for both X and Y
39 * we pick ABS_X/ABS_Y dimensions which are multiples of 256 and in
40 * the right ballpark given the touchpad's physical dimensions and estimate
41 * resolution per spec sheet, device active area dimensions are
42 * 101.6 x 60.1 mm.
43 */
44 #define BYD_PAD_WIDTH 11264
45 #define BYD_PAD_HEIGHT 6656
46 #define BYD_PAD_RESOLUTION 111
47
48 /*
49 * Given the above dimensions, relative packets velocity is in multiples of
50 * 1 unit / 11 milliseconds. We use this dt to estimate distance traveled
51 */
52 #define BYD_DT 11
53 /* Time in jiffies used to timeout various touch events (64 ms) */
54 #define BYD_TOUCH_TIMEOUT msecs_to_jiffies(64)
55
56 /* BYD commands reverse engineered from windows driver */
57
58 /*
59 * Swipe gesture from off-pad to on-pad
60 * 0 : disable
61 * 1 : enable
62 */
63 #define BYD_CMD_SET_OFFSCREEN_SWIPE 0x10cc
64 /*
65 * Tap and drag delay time
66 * 0 : disable
67 * 1 - 8 : least to most delay
68 */
69 #define BYD_CMD_SET_TAP_DRAG_DELAY_TIME 0x10cf
70 /*
71 * Physical buttons function mapping
72 * 0 : enable
73 * 4 : normal
74 * 5 : left button custom command
75 * 6 : right button custom command
76 * 8 : disable
77 */
78 #define BYD_CMD_SET_PHYSICAL_BUTTONS 0x10d0
79 /*
80 * Absolute mode (1 byte X/Y resolution)
81 * 0 : disable
82 * 2 : enable
83 */
84 #define BYD_CMD_SET_ABSOLUTE_MODE 0x10d1
85 /*
86 * Two finger scrolling
87 * 1 : vertical
88 * 2 : horizontal
89 * 3 : vertical + horizontal
90 * 4 : disable
91 */
92 #define BYD_CMD_SET_TWO_FINGER_SCROLL 0x10d2
93 /*
94 * Handedness
95 * 1 : right handed
96 * 2 : left handed
97 */
98 #define BYD_CMD_SET_HANDEDNESS 0x10d3
99 /*
100 * Tap to click
101 * 1 : enable
102 * 2 : disable
103 */
104 #define BYD_CMD_SET_TAP 0x10d4
105 /*
106 * Tap and drag
107 * 1 : tap and hold to drag
108 * 2 : tap and hold to drag + lock
109 * 3 : disable
110 */
111 #define BYD_CMD_SET_TAP_DRAG 0x10d5
112 /*
113 * Touch sensitivity
114 * 1 - 7 : least to most sensitive
115 */
116 #define BYD_CMD_SET_TOUCH_SENSITIVITY 0x10d6
117 /*
118 * One finger scrolling
119 * 1 : vertical
120 * 2 : horizontal
121 * 3 : vertical + horizontal
122 * 4 : disable
123 */
124 #define BYD_CMD_SET_ONE_FINGER_SCROLL 0x10d7
125 /*
126 * One finger scrolling function
127 * 1 : free scrolling
128 * 2 : edge motion
129 * 3 : free scrolling + edge motion
130 * 4 : disable
131 */
132 #define BYD_CMD_SET_ONE_FINGER_SCROLL_FUNC 0x10d8
133 /*
134 * Sliding speed
135 * 1 - 5 : slowest to fastest
136 */
137 #define BYD_CMD_SET_SLIDING_SPEED 0x10da
138 /*
139 * Edge motion
140 * 1 : disable
141 * 2 : enable when dragging
142 * 3 : enable when dragging and pointing
143 */
144 #define BYD_CMD_SET_EDGE_MOTION 0x10db
145 /*
146 * Left edge region size
147 * 0 - 7 : smallest to largest width
148 */
149 #define BYD_CMD_SET_LEFT_EDGE_REGION 0x10dc
150 /*
151 * Top edge region size
152 * 0 - 9 : smallest to largest height
153 */
154 #define BYD_CMD_SET_TOP_EDGE_REGION 0x10dd
155 /*
156 * Disregard palm press as clicks
157 * 1 - 6 : smallest to largest
158 */
159 #define BYD_CMD_SET_PALM_CHECK 0x10de
160 /*
161 * Right edge region size
162 * 0 - 7 : smallest to largest width
163 */
164 #define BYD_CMD_SET_RIGHT_EDGE_REGION 0x10df
165 /*
166 * Bottom edge region size
167 * 0 - 9 : smallest to largest height
168 */
169 #define BYD_CMD_SET_BOTTOM_EDGE_REGION 0x10e1
170 /*
171 * Multitouch gestures
172 * 1 : enable
173 * 2 : disable
174 */
175 #define BYD_CMD_SET_MULTITOUCH 0x10e3
176 /*
177 * Edge motion speed
178 * 0 : control with finger pressure
179 * 1 - 9 : slowest to fastest
180 */
181 #define BYD_CMD_SET_EDGE_MOTION_SPEED 0x10e4
182 /*
183 * Two finger scolling function
184 * 0 : free scrolling
185 * 1 : free scrolling (with momentum)
186 * 2 : edge motion
187 * 3 : free scrolling (with momentum) + edge motion
188 * 4 : disable
189 */
190 #define BYD_CMD_SET_TWO_FINGER_SCROLL_FUNC 0x10e5
191
192 /*
193 * The touchpad generates a mixture of absolute and relative packets, indicated
194 * by the last byte of each packet being set to one of the following:
195 */
196 #define BYD_PACKET_ABSOLUTE 0xf8
197 #define BYD_PACKET_RELATIVE 0x00
198 /* Multitouch gesture packets */
199 #define BYD_PACKET_PINCH_IN 0xd8
200 #define BYD_PACKET_PINCH_OUT 0x28
201 #define BYD_PACKET_ROTATE_CLOCKWISE 0x29
202 #define BYD_PACKET_ROTATE_ANTICLOCKWISE 0xd7
203 #define BYD_PACKET_TWO_FINGER_SCROLL_RIGHT 0x2a
204 #define BYD_PACKET_TWO_FINGER_SCROLL_DOWN 0x2b
205 #define BYD_PACKET_TWO_FINGER_SCROLL_UP 0xd5
206 #define BYD_PACKET_TWO_FINGER_SCROLL_LEFT 0xd6
207 #define BYD_PACKET_THREE_FINGER_SWIPE_RIGHT 0x2c
208 #define BYD_PACKET_THREE_FINGER_SWIPE_DOWN 0x2d
209 #define BYD_PACKET_THREE_FINGER_SWIPE_UP 0xd3
210 #define BYD_PACKET_THREE_FINGER_SWIPE_LEFT 0xd4
211 #define BYD_PACKET_FOUR_FINGER_DOWN 0x33
212 #define BYD_PACKET_FOUR_FINGER_UP 0xcd
213 #define BYD_PACKET_REGION_SCROLL_RIGHT 0x35
214 #define BYD_PACKET_REGION_SCROLL_DOWN 0x36
215 #define BYD_PACKET_REGION_SCROLL_UP 0xca
216 #define BYD_PACKET_REGION_SCROLL_LEFT 0xcb
217 #define BYD_PACKET_RIGHT_CORNER_CLICK 0xd2
218 #define BYD_PACKET_LEFT_CORNER_CLICK 0x2e
219 #define BYD_PACKET_LEFT_AND_RIGHT_CORNER_CLICK 0x2f
220 #define BYD_PACKET_ONTO_PAD_SWIPE_RIGHT 0x37
221 #define BYD_PACKET_ONTO_PAD_SWIPE_DOWN 0x30
222 #define BYD_PACKET_ONTO_PAD_SWIPE_UP 0xd0
223 #define BYD_PACKET_ONTO_PAD_SWIPE_LEFT 0xc9
224
225 struct byd_data {
226 struct timer_list timer;
227 struct psmouse *psmouse;
228 s32 abs_x;
229 s32 abs_y;
230 typeof(jiffies) last_touch_time;
231 bool btn_left;
232 bool btn_right;
233 bool touch;
234 };
235
byd_report_input(struct psmouse * psmouse)236 static void byd_report_input(struct psmouse *psmouse)
237 {
238 struct byd_data *priv = psmouse->private;
239 struct input_dev *dev = psmouse->dev;
240
241 input_report_key(dev, BTN_TOUCH, priv->touch);
242 input_report_key(dev, BTN_TOOL_FINGER, priv->touch);
243
244 input_report_abs(dev, ABS_X, priv->abs_x);
245 input_report_abs(dev, ABS_Y, priv->abs_y);
246 input_report_key(dev, BTN_LEFT, priv->btn_left);
247 input_report_key(dev, BTN_RIGHT, priv->btn_right);
248
249 input_sync(dev);
250 }
251
byd_clear_touch(struct timer_list * t)252 static void byd_clear_touch(struct timer_list *t)
253 {
254 struct byd_data *priv = from_timer(priv, t, timer);
255 struct psmouse *psmouse = priv->psmouse;
256
257 guard(serio_pause_rx)(psmouse->ps2dev.serio);
258
259 priv->touch = false;
260
261 byd_report_input(psmouse);
262
263 /*
264 * Move cursor back to center of pad when we lose touch - this
265 * specifically improves user experience when moving cursor with one
266 * finger, and pressing a button with another.
267 */
268 priv->abs_x = BYD_PAD_WIDTH / 2;
269 priv->abs_y = BYD_PAD_HEIGHT / 2;
270 }
271
byd_process_byte(struct psmouse * psmouse)272 static psmouse_ret_t byd_process_byte(struct psmouse *psmouse)
273 {
274 struct byd_data *priv = psmouse->private;
275 u8 *pkt = psmouse->packet;
276
277 if (psmouse->pktcnt > 0 && !(pkt[0] & PS2_ALWAYS_1)) {
278 psmouse_warn(psmouse, "Always_1 bit not 1. pkt[0] = %02x\n",
279 pkt[0]);
280 return PSMOUSE_BAD_DATA;
281 }
282
283 if (psmouse->pktcnt < psmouse->pktsize)
284 return PSMOUSE_GOOD_DATA;
285
286 /* Otherwise, a full packet has been received */
287 switch (pkt[3]) {
288 case BYD_PACKET_ABSOLUTE:
289 /* Only use absolute packets for the start of movement. */
290 if (!priv->touch) {
291 /* needed to detect tap */
292 typeof(jiffies) tap_time =
293 priv->last_touch_time + BYD_TOUCH_TIMEOUT;
294 priv->touch = time_after(jiffies, tap_time);
295
296 /* init abs position */
297 priv->abs_x = pkt[1] * (BYD_PAD_WIDTH / 256);
298 priv->abs_y = (255 - pkt[2]) * (BYD_PAD_HEIGHT / 256);
299 }
300 break;
301 case BYD_PACKET_RELATIVE: {
302 /* Standard packet */
303 /* Sign-extend if a sign bit is set. */
304 u32 signx = pkt[0] & PS2_X_SIGN ? ~0xFF : 0;
305 u32 signy = pkt[0] & PS2_Y_SIGN ? ~0xFF : 0;
306 s32 dx = signx | (int) pkt[1];
307 s32 dy = signy | (int) pkt[2];
308
309 /* Update position based on velocity */
310 priv->abs_x += dx * BYD_DT;
311 priv->abs_y -= dy * BYD_DT;
312
313 priv->touch = true;
314 break;
315 }
316 default:
317 psmouse_warn(psmouse,
318 "Unrecognized Z: pkt = %02x %02x %02x %02x\n",
319 psmouse->packet[0], psmouse->packet[1],
320 psmouse->packet[2], psmouse->packet[3]);
321 return PSMOUSE_BAD_DATA;
322 }
323
324 priv->btn_left = pkt[0] & PS2_LEFT;
325 priv->btn_right = pkt[0] & PS2_RIGHT;
326
327 byd_report_input(psmouse);
328
329 /* Reset time since last touch. */
330 if (priv->touch) {
331 priv->last_touch_time = jiffies;
332 mod_timer(&priv->timer, jiffies + BYD_TOUCH_TIMEOUT);
333 }
334
335 return PSMOUSE_FULL_PACKET;
336 }
337
byd_reset_touchpad(struct psmouse * psmouse)338 static int byd_reset_touchpad(struct psmouse *psmouse)
339 {
340 struct ps2dev *ps2dev = &psmouse->ps2dev;
341 u8 param[4];
342 size_t i;
343
344 static const struct {
345 u16 command;
346 u8 arg;
347 } seq[] = {
348 /*
349 * Intellimouse initialization sequence, to get 4-byte instead
350 * of 3-byte packets.
351 */
352 { PSMOUSE_CMD_SETRATE, 0xC8 },
353 { PSMOUSE_CMD_SETRATE, 0x64 },
354 { PSMOUSE_CMD_SETRATE, 0x50 },
355 { PSMOUSE_CMD_GETID, 0 },
356 { PSMOUSE_CMD_ENABLE, 0 },
357 /*
358 * BYD-specific initialization, which enables absolute mode and
359 * (if desired), the touchpad's built-in gesture detection.
360 */
361 { 0x10E2, 0x00 },
362 { 0x10E0, 0x02 },
363 /* The touchpad should reply with 4 seemingly-random bytes */
364 { 0x14E0, 0x01 },
365 /* Pairs of parameters and values. */
366 { BYD_CMD_SET_HANDEDNESS, 0x01 },
367 { BYD_CMD_SET_PHYSICAL_BUTTONS, 0x04 },
368 { BYD_CMD_SET_TAP, 0x02 },
369 { BYD_CMD_SET_ONE_FINGER_SCROLL, 0x04 },
370 { BYD_CMD_SET_ONE_FINGER_SCROLL_FUNC, 0x04 },
371 { BYD_CMD_SET_EDGE_MOTION, 0x01 },
372 { BYD_CMD_SET_PALM_CHECK, 0x00 },
373 { BYD_CMD_SET_MULTITOUCH, 0x02 },
374 { BYD_CMD_SET_TWO_FINGER_SCROLL, 0x04 },
375 { BYD_CMD_SET_TWO_FINGER_SCROLL_FUNC, 0x04 },
376 { BYD_CMD_SET_LEFT_EDGE_REGION, 0x00 },
377 { BYD_CMD_SET_TOP_EDGE_REGION, 0x00 },
378 { BYD_CMD_SET_RIGHT_EDGE_REGION, 0x00 },
379 { BYD_CMD_SET_BOTTOM_EDGE_REGION, 0x00 },
380 { BYD_CMD_SET_ABSOLUTE_MODE, 0x02 },
381 /* Finalize initialization. */
382 { 0x10E0, 0x00 },
383 { 0x10E2, 0x01 },
384 };
385
386 for (i = 0; i < ARRAY_SIZE(seq); ++i) {
387 memset(param, 0, sizeof(param));
388 param[0] = seq[i].arg;
389 if (ps2_command(ps2dev, param, seq[i].command))
390 return -EIO;
391 }
392
393 psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
394 return 0;
395 }
396
byd_reconnect(struct psmouse * psmouse)397 static int byd_reconnect(struct psmouse *psmouse)
398 {
399 int retry = 0, error = 0;
400
401 psmouse_dbg(psmouse, "Reconnect\n");
402 do {
403 psmouse_reset(psmouse);
404 if (retry)
405 ssleep(1);
406 error = byd_detect(psmouse, 0);
407 } while (error && ++retry < 3);
408
409 if (error)
410 return error;
411
412 psmouse_dbg(psmouse, "Reconnected after %d attempts\n", retry);
413
414 error = byd_reset_touchpad(psmouse);
415 if (error) {
416 psmouse_err(psmouse, "Unable to initialize device\n");
417 return error;
418 }
419
420 return 0;
421 }
422
byd_disconnect(struct psmouse * psmouse)423 static void byd_disconnect(struct psmouse *psmouse)
424 {
425 struct byd_data *priv = psmouse->private;
426
427 if (priv) {
428 del_timer(&priv->timer);
429 kfree(psmouse->private);
430 psmouse->private = NULL;
431 }
432 }
433
byd_detect(struct psmouse * psmouse,bool set_properties)434 int byd_detect(struct psmouse *psmouse, bool set_properties)
435 {
436 struct ps2dev *ps2dev = &psmouse->ps2dev;
437 u8 param[4] = {0x03, 0x00, 0x00, 0x00};
438
439 if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
440 return -1;
441 if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
442 return -1;
443 if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
444 return -1;
445 if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
446 return -1;
447 if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
448 return -1;
449
450 if (param[1] != 0x03 || param[2] != 0x64)
451 return -ENODEV;
452
453 psmouse_dbg(psmouse, "BYD touchpad detected\n");
454
455 if (set_properties) {
456 psmouse->vendor = "BYD";
457 psmouse->name = "TouchPad";
458 }
459
460 return 0;
461 }
462
byd_init(struct psmouse * psmouse)463 int byd_init(struct psmouse *psmouse)
464 {
465 struct input_dev *dev = psmouse->dev;
466 struct byd_data *priv;
467
468 if (psmouse_reset(psmouse))
469 return -EIO;
470
471 if (byd_reset_touchpad(psmouse))
472 return -EIO;
473
474 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
475 if (!priv)
476 return -ENOMEM;
477
478 priv->psmouse = psmouse;
479 timer_setup(&priv->timer, byd_clear_touch, 0);
480
481 psmouse->private = priv;
482 psmouse->disconnect = byd_disconnect;
483 psmouse->reconnect = byd_reconnect;
484 psmouse->protocol_handler = byd_process_byte;
485 psmouse->pktsize = 4;
486 psmouse->resync_time = 0;
487
488 __set_bit(INPUT_PROP_POINTER, dev->propbit);
489 /* Touchpad */
490 __set_bit(BTN_TOUCH, dev->keybit);
491 __set_bit(BTN_TOOL_FINGER, dev->keybit);
492 /* Buttons */
493 __set_bit(BTN_LEFT, dev->keybit);
494 __set_bit(BTN_RIGHT, dev->keybit);
495 __clear_bit(BTN_MIDDLE, dev->keybit);
496
497 /* Absolute position */
498 __set_bit(EV_ABS, dev->evbit);
499 input_set_abs_params(dev, ABS_X, 0, BYD_PAD_WIDTH, 0, 0);
500 input_set_abs_params(dev, ABS_Y, 0, BYD_PAD_HEIGHT, 0, 0);
501 input_abs_set_res(dev, ABS_X, BYD_PAD_RESOLUTION);
502 input_abs_set_res(dev, ABS_Y, BYD_PAD_RESOLUTION);
503 /* No relative support */
504 __clear_bit(EV_REL, dev->evbit);
505 __clear_bit(REL_X, dev->relbit);
506 __clear_bit(REL_Y, dev->relbit);
507
508 return 0;
509 }
510