2 * BYD TouchPad PS/2 mouse driver
4 * Copyright (C) 2015 Chris Diamand <chris@diamand.org>
5 * Copyright (C) 2015 Richard Pospesel
6 * Copyright (C) 2015 Tai Chi Minh Ralph Eastwood
7 * Copyright (C) 2015 Martin Wimpress
8 * Copyright (C) 2015 Jay Kuri
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License version 2 as published by
12 * the Free Software Foundation.
15 #include <linux/delay.h>
16 #include <linux/input.h>
17 #include <linux/libps2.h>
18 #include <linux/serio.h>
19 #include <linux/slab.h>
25 #define PS2_Y_OVERFLOW BIT_MASK(7)
26 #define PS2_X_OVERFLOW BIT_MASK(6)
27 #define PS2_Y_SIGN BIT_MASK(5)
28 #define PS2_X_SIGN BIT_MASK(4)
29 #define PS2_ALWAYS_1 BIT_MASK(3)
30 #define PS2_MIDDLE BIT_MASK(2)
31 #define PS2_RIGHT BIT_MASK(1)
32 #define PS2_LEFT BIT_MASK(0)
39 * True device resolution is unknown, however experiments show the
40 * resolution is about 111 units/mm.
41 * Absolute coordinate packets are in the range 0-255 for both X and Y
42 * we pick ABS_X/ABS_Y dimensions which are multiples of 256 and in
43 * the right ballpark given the touchpad's physical dimensions and estimate
44 * resolution per spec sheet, device active area dimensions are
47 #define BYD_PAD_WIDTH 11264
48 #define BYD_PAD_HEIGHT 6656
49 #define BYD_PAD_RESOLUTION 111
52 * Given the above dimensions, relative packets velocity is in multiples of
53 * 1 unit / 11 milliseconds. We use this dt to estimate distance traveled
56 /* Time in jiffies used to timeout various touch events (64 ms) */
57 #define BYD_TOUCH_TIMEOUT msecs_to_jiffies(64)
59 /* BYD commands reverse engineered from windows driver */
62 * Swipe gesture from off-pad to on-pad
66 #define BYD_CMD_SET_OFFSCREEN_SWIPE 0x10cc
68 * Tap and drag delay time
70 * 1 - 8 : least to most delay
72 #define BYD_CMD_SET_TAP_DRAG_DELAY_TIME 0x10cf
74 * Physical buttons function mapping
77 * 5 : left button custom command
78 * 6 : right button custom command
81 #define BYD_CMD_SET_PHYSICAL_BUTTONS 0x10d0
83 * Absolute mode (1 byte X/Y resolution)
87 #define BYD_CMD_SET_ABSOLUTE_MODE 0x10d1
89 * Two finger scrolling
92 * 3 : vertical + horizontal
95 #define BYD_CMD_SET_TWO_FINGER_SCROLL 0x10d2
101 #define BYD_CMD_SET_HANDEDNESS 0x10d3
107 #define BYD_CMD_SET_TAP 0x10d4
110 * 1 : tap and hold to drag
111 * 2 : tap and hold to drag + lock
114 #define BYD_CMD_SET_TAP_DRAG 0x10d5
117 * 1 - 7 : least to most sensitive
119 #define BYD_CMD_SET_TOUCH_SENSITIVITY 0x10d6
121 * One finger scrolling
124 * 3 : vertical + horizontal
127 #define BYD_CMD_SET_ONE_FINGER_SCROLL 0x10d7
129 * One finger scrolling function
132 * 3 : free scrolling + edge motion
135 #define BYD_CMD_SET_ONE_FINGER_SCROLL_FUNC 0x10d8
138 * 1 - 5 : slowest to fastest
140 #define BYD_CMD_SET_SLIDING_SPEED 0x10da
144 * 2 : enable when dragging
145 * 3 : enable when dragging and pointing
147 #define BYD_CMD_SET_EDGE_MOTION 0x10db
149 * Left edge region size
150 * 0 - 7 : smallest to largest width
152 #define BYD_CMD_SET_LEFT_EDGE_REGION 0x10dc
154 * Top edge region size
155 * 0 - 9 : smallest to largest height
157 #define BYD_CMD_SET_TOP_EDGE_REGION 0x10dd
159 * Disregard palm press as clicks
160 * 1 - 6 : smallest to largest
162 #define BYD_CMD_SET_PALM_CHECK 0x10de
164 * Right edge region size
165 * 0 - 7 : smallest to largest width
167 #define BYD_CMD_SET_RIGHT_EDGE_REGION 0x10df
169 * Bottom edge region size
170 * 0 - 9 : smallest to largest height
172 #define BYD_CMD_SET_BOTTOM_EDGE_REGION 0x10e1
174 * Multitouch gestures
178 #define BYD_CMD_SET_MULTITOUCH 0x10e3
181 * 0 : control with finger pressure
182 * 1 - 9 : slowest to fastest
184 #define BYD_CMD_SET_EDGE_MOTION_SPEED 0x10e4
186 * Two finger scolling function
188 * 1 : free scrolling (with momentum)
190 * 3 : free scrolling (with momentum) + edge motion
193 #define BYD_CMD_SET_TWO_FINGER_SCROLL_FUNC 0x10e5
196 * The touchpad generates a mixture of absolute and relative packets, indicated
197 * by the the last byte of each packet being set to one of the following:
199 #define BYD_PACKET_ABSOLUTE 0xf8
200 #define BYD_PACKET_RELATIVE 0x00
201 /* Multitouch gesture packets */
202 #define BYD_PACKET_PINCH_IN 0xd8
203 #define BYD_PACKET_PINCH_OUT 0x28
204 #define BYD_PACKET_ROTATE_CLOCKWISE 0x29
205 #define BYD_PACKET_ROTATE_ANTICLOCKWISE 0xd7
206 #define BYD_PACKET_TWO_FINGER_SCROLL_RIGHT 0x2a
207 #define BYD_PACKET_TWO_FINGER_SCROLL_DOWN 0x2b
208 #define BYD_PACKET_TWO_FINGER_SCROLL_UP 0xd5
209 #define BYD_PACKET_TWO_FINGER_SCROLL_LEFT 0xd6
210 #define BYD_PACKET_THREE_FINGER_SWIPE_RIGHT 0x2c
211 #define BYD_PACKET_THREE_FINGER_SWIPE_DOWN 0x2d
212 #define BYD_PACKET_THREE_FINGER_SWIPE_UP 0xd3
213 #define BYD_PACKET_THREE_FINGER_SWIPE_LEFT 0xd4
214 #define BYD_PACKET_FOUR_FINGER_DOWN 0x33
215 #define BYD_PACKET_FOUR_FINGER_UP 0xcd
216 #define BYD_PACKET_REGION_SCROLL_RIGHT 0x35
217 #define BYD_PACKET_REGION_SCROLL_DOWN 0x36
218 #define BYD_PACKET_REGION_SCROLL_UP 0xca
219 #define BYD_PACKET_REGION_SCROLL_LEFT 0xcb
220 #define BYD_PACKET_RIGHT_CORNER_CLICK 0xd2
221 #define BYD_PACKET_LEFT_CORNER_CLICK 0x2e
222 #define BYD_PACKET_LEFT_AND_RIGHT_CORNER_CLICK 0x2f
223 #define BYD_PACKET_ONTO_PAD_SWIPE_RIGHT 0x37
224 #define BYD_PACKET_ONTO_PAD_SWIPE_DOWN 0x30
225 #define BYD_PACKET_ONTO_PAD_SWIPE_UP 0xd0
226 #define BYD_PACKET_ONTO_PAD_SWIPE_LEFT 0xc9
229 struct timer_list timer;
232 typeof(jiffies) last_touch_time;
238 static void byd_report_input(struct psmouse *psmouse)
240 struct byd_data *priv = psmouse->private;
241 struct input_dev *dev = psmouse->dev;
243 input_report_key(dev, BTN_TOUCH, priv->touch);
244 input_report_key(dev, BTN_TOOL_FINGER, priv->touch);
246 input_report_abs(dev, ABS_X, priv->abs_x);
247 input_report_abs(dev, ABS_Y, priv->abs_y);
248 input_report_key(dev, BTN_LEFT, priv->btn_left);
249 input_report_key(dev, BTN_RIGHT, priv->btn_right);
254 static void byd_clear_touch(unsigned long data)
256 struct psmouse *psmouse = (struct psmouse *)data;
257 struct byd_data *priv = psmouse->private;
259 serio_pause_rx(psmouse->ps2dev.serio);
262 byd_report_input(psmouse);
264 serio_continue_rx(psmouse->ps2dev.serio);
267 * Move cursor back to center of pad when we lose touch - this
268 * specifically improves user experience when moving cursor with one
269 * finger, and pressing a button with another.
271 priv->abs_x = BYD_PAD_WIDTH / 2;
272 priv->abs_y = BYD_PAD_HEIGHT / 2;
275 static psmouse_ret_t byd_process_byte(struct psmouse *psmouse)
277 struct byd_data *priv = psmouse->private;
278 u8 *pkt = psmouse->packet;
280 if (psmouse->pktcnt > 0 && !(pkt[0] & PS2_ALWAYS_1)) {
281 psmouse_warn(psmouse, "Always_1 bit not 1. pkt[0] = %02x\n",
283 return PSMOUSE_BAD_DATA;
286 if (psmouse->pktcnt < psmouse->pktsize)
287 return PSMOUSE_GOOD_DATA;
289 /* Otherwise, a full packet has been received */
291 case BYD_PACKET_ABSOLUTE:
292 /* Only use absolute packets for the start of movement. */
294 /* needed to detect tap */
295 typeof(jiffies) tap_time =
296 priv->last_touch_time + BYD_TOUCH_TIMEOUT;
297 priv->touch = time_after(jiffies, tap_time);
299 /* init abs position */
300 priv->abs_x = pkt[1] * (BYD_PAD_WIDTH / 256);
301 priv->abs_y = (255 - pkt[2]) * (BYD_PAD_HEIGHT / 256);
304 case BYD_PACKET_RELATIVE: {
305 /* Standard packet */
306 /* Sign-extend if a sign bit is set. */
307 u32 signx = pkt[0] & PS2_X_SIGN ? ~0xFF : 0;
308 u32 signy = pkt[0] & PS2_Y_SIGN ? ~0xFF : 0;
309 s32 dx = signx | (int) pkt[1];
310 s32 dy = signy | (int) pkt[2];
312 /* Update position based on velocity */
313 priv->abs_x += dx * BYD_DT;
314 priv->abs_y -= dy * BYD_DT;
320 psmouse_warn(psmouse,
321 "Unrecognized Z: pkt = %02x %02x %02x %02x\n",
322 psmouse->packet[0], psmouse->packet[1],
323 psmouse->packet[2], psmouse->packet[3]);
324 return PSMOUSE_BAD_DATA;
327 priv->btn_left = pkt[0] & PS2_LEFT;
328 priv->btn_right = pkt[0] & PS2_RIGHT;
330 byd_report_input(psmouse);
332 /* Reset time since last touch. */
334 priv->last_touch_time = jiffies;
335 mod_timer(&priv->timer, jiffies + BYD_TOUCH_TIMEOUT);
338 return PSMOUSE_FULL_PACKET;
341 static int byd_reset_touchpad(struct psmouse *psmouse)
343 struct ps2dev *ps2dev = &psmouse->ps2dev;
352 * Intellimouse initialization sequence, to get 4-byte instead
355 { PSMOUSE_CMD_SETRATE, 0xC8 },
356 { PSMOUSE_CMD_SETRATE, 0x64 },
357 { PSMOUSE_CMD_SETRATE, 0x50 },
358 { PSMOUSE_CMD_GETID, 0 },
359 { PSMOUSE_CMD_ENABLE, 0 },
361 * BYD-specific initialization, which enables absolute mode and
362 * (if desired), the touchpad's built-in gesture detection.
366 /* The touchpad should reply with 4 seemingly-random bytes */
368 /* Pairs of parameters and values. */
369 { BYD_CMD_SET_HANDEDNESS, 0x01 },
370 { BYD_CMD_SET_PHYSICAL_BUTTONS, 0x04 },
371 { BYD_CMD_SET_TAP, 0x02 },
372 { BYD_CMD_SET_ONE_FINGER_SCROLL, 0x04 },
373 { BYD_CMD_SET_ONE_FINGER_SCROLL_FUNC, 0x04 },
374 { BYD_CMD_SET_EDGE_MOTION, 0x01 },
375 { BYD_CMD_SET_PALM_CHECK, 0x00 },
376 { BYD_CMD_SET_MULTITOUCH, 0x02 },
377 { BYD_CMD_SET_TWO_FINGER_SCROLL, 0x04 },
378 { BYD_CMD_SET_TWO_FINGER_SCROLL_FUNC, 0x04 },
379 { BYD_CMD_SET_LEFT_EDGE_REGION, 0x00 },
380 { BYD_CMD_SET_TOP_EDGE_REGION, 0x00 },
381 { BYD_CMD_SET_RIGHT_EDGE_REGION, 0x00 },
382 { BYD_CMD_SET_BOTTOM_EDGE_REGION, 0x00 },
383 { BYD_CMD_SET_ABSOLUTE_MODE, 0x02 },
384 /* Finalize initialization. */
389 for (i = 0; i < ARRAY_SIZE(seq); ++i) {
390 memset(param, 0, sizeof(param));
391 param[0] = seq[i].arg;
392 if (ps2_command(ps2dev, param, seq[i].command))
396 psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
400 static int byd_reconnect(struct psmouse *psmouse)
402 int retry = 0, error = 0;
404 psmouse_dbg(psmouse, "Reconnect\n");
406 psmouse_reset(psmouse);
409 error = byd_detect(psmouse, 0);
410 } while (error && ++retry < 3);
415 psmouse_dbg(psmouse, "Reconnected after %d attempts\n", retry);
417 error = byd_reset_touchpad(psmouse);
419 psmouse_err(psmouse, "Unable to initialize device\n");
426 static void byd_disconnect(struct psmouse *psmouse)
428 struct byd_data *priv = psmouse->private;
431 del_timer(&priv->timer);
432 kfree(psmouse->private);
433 psmouse->private = NULL;
437 int byd_detect(struct psmouse *psmouse, bool set_properties)
439 struct ps2dev *ps2dev = &psmouse->ps2dev;
440 u8 param[4] = {0x03, 0x00, 0x00, 0x00};
442 if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
444 if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
446 if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
448 if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
450 if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
453 if (param[1] != 0x03 || param[2] != 0x64)
456 psmouse_dbg(psmouse, "BYD touchpad detected\n");
458 if (set_properties) {
459 psmouse->vendor = "BYD";
460 psmouse->name = "TouchPad";
466 int byd_init(struct psmouse *psmouse)
468 struct input_dev *dev = psmouse->dev;
469 struct byd_data *priv;
471 if (psmouse_reset(psmouse))
474 if (byd_reset_touchpad(psmouse))
477 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
481 setup_timer(&priv->timer, byd_clear_touch, (unsigned long) psmouse);
483 psmouse->private = priv;
484 psmouse->disconnect = byd_disconnect;
485 psmouse->reconnect = byd_reconnect;
486 psmouse->protocol_handler = byd_process_byte;
487 psmouse->pktsize = 4;
488 psmouse->resync_time = 0;
490 __set_bit(INPUT_PROP_POINTER, dev->propbit);
492 __set_bit(BTN_TOUCH, dev->keybit);
493 __set_bit(BTN_TOOL_FINGER, dev->keybit);
495 __set_bit(BTN_LEFT, dev->keybit);
496 __set_bit(BTN_RIGHT, dev->keybit);
497 __clear_bit(BTN_MIDDLE, dev->keybit);
499 /* Absolute position */
500 __set_bit(EV_ABS, dev->evbit);
501 input_set_abs_params(dev, ABS_X, 0, BYD_PAD_WIDTH, 0, 0);
502 input_set_abs_params(dev, ABS_Y, 0, BYD_PAD_HEIGHT, 0, 0);
503 input_abs_set_res(dev, ABS_X, BYD_PAD_RESOLUTION);
504 input_abs_set_res(dev, ABS_Y, BYD_PAD_RESOLUTION);
505 /* No relative support */
506 __clear_bit(EV_REL, dev->evbit);
507 __clear_bit(REL_X, dev->relbit);
508 __clear_bit(REL_Y, dev->relbit);