drivers/input/mouse/byd.c

   1 /*
   2  * BYD TouchPad PS/2 mouse driver
   3  *
   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
   9  *
  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.
  13  */
  14
  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>
  20
  21 #include "psmouse.h"
  22 #include "byd.h"
  23
  24 /* PS2 Bits */
  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)
  33
  34 /*
  35  * BYD pad constants
  36  */
  37
  38 /*
  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
  45  * 101.6 x 60.1 mm.
  46  */
  47 #define BYD_PAD_WIDTH           11264
  48 #define BYD_PAD_HEIGHT          6656
  49 #define BYD_PAD_RESOLUTION      111
  50
  51 /*
  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
  54  */
  55 #define BYD_DT                  11
  56 /* Time in jiffies used to timeout various touch events (64 ms) */
  57 #define BYD_TOUCH_TIMEOUT       msecs_to_jiffies(64)
  58
  59 /* BYD commands reverse engineered from windows driver */
  60
  61 /*
  62  * Swipe gesture from off-pad to on-pad
  63  *  0 : disable
  64  *  1 : enable
  65  */
  66 #define BYD_CMD_SET_OFFSCREEN_SWIPE             0x10cc
  67 /*
  68  * Tap and drag delay time
  69  *  0 : disable
  70  *  1 - 8 : least to most delay
  71  */
  72 #define BYD_CMD_SET_TAP_DRAG_DELAY_TIME         0x10cf
  73 /*
  74  * Physical buttons function mapping
  75  *  0 : enable
  76  *  4 : normal
  77  *  5 : left button custom command
  78  *  6 : right button custom command
  79  *  8 : disable
  80  */
  81 #define BYD_CMD_SET_PHYSICAL_BUTTONS            0x10d0
  82 /*
  83  * Absolute mode (1 byte X/Y resolution)
  84  *  0 : disable
  85  *  2 : enable
  86  */
  87 #define BYD_CMD_SET_ABSOLUTE_MODE               0x10d1
  88 /*
  89  * Two finger scrolling
  90  *  1 : vertical
  91  *  2 : horizontal
  92  *  3 : vertical + horizontal
  93  *  4 : disable
  94  */
  95 #define BYD_CMD_SET_TWO_FINGER_SCROLL           0x10d2
  96 /*
  97  * Handedness
  98  *  1 : right handed
  99  *  2 : left handed
 100  */
 101 #define BYD_CMD_SET_HANDEDNESS                  0x10d3
 102 /*
 103  * Tap to click
 104  *  1 : enable
 105  *  2 : disable
 106  */
 107 #define BYD_CMD_SET_TAP                         0x10d4
 108 /*
 109  * Tap and drag
 110  *  1 : tap and hold to drag
 111  *  2 : tap and hold to drag + lock
 112  *  3 : disable
 113  */
 114 #define BYD_CMD_SET_TAP_DRAG                    0x10d5
 115 /*
 116  * Touch sensitivity
 117  *  1 - 7 : least to most sensitive
 118  */
 119 #define BYD_CMD_SET_TOUCH_SENSITIVITY           0x10d6
 120 /*
 121  * One finger scrolling
 122  *  1 : vertical
 123  *  2 : horizontal
 124  *  3 : vertical + horizontal
 125  *  4 : disable
 126  */
 127 #define BYD_CMD_SET_ONE_FINGER_SCROLL           0x10d7
 128 /*
 129  * One finger scrolling function
 130  *  1 : free scrolling
 131  *  2 : edge motion
 132  *  3 : free scrolling + edge motion
 133  *  4 : disable
 134  */
 135 #define BYD_CMD_SET_ONE_FINGER_SCROLL_FUNC      0x10d8
 136 /*
 137  * Sliding speed
 138  *  1 - 5 : slowest to fastest
 139  */
 140 #define BYD_CMD_SET_SLIDING_SPEED               0x10da
 141 /*
 142  * Edge motion
 143  *  1 : disable
 144  *  2 : enable when dragging
 145  *  3 : enable when dragging and pointing
 146  */
 147 #define BYD_CMD_SET_EDGE_MOTION                 0x10db
 148 /*
 149  * Left edge region size
 150  *  0 - 7 : smallest to largest width
 151  */
 152 #define BYD_CMD_SET_LEFT_EDGE_REGION            0x10dc
 153 /*
 154  * Top edge region size
 155  *  0 - 9 : smallest to largest height
 156  */
 157 #define BYD_CMD_SET_TOP_EDGE_REGION             0x10dd
 158 /*
 159  * Disregard palm press as clicks
 160  *  1 - 6 : smallest to largest
 161  */
 162 #define BYD_CMD_SET_PALM_CHECK                  0x10de
 163 /*
 164  * Right edge region size
 165  *  0 - 7 : smallest to largest width
 166  */
 167 #define BYD_CMD_SET_RIGHT_EDGE_REGION           0x10df
 168 /*
 169  * Bottom edge region size
 170  *  0 - 9 : smallest to largest height
 171  */
 172 #define BYD_CMD_SET_BOTTOM_EDGE_REGION          0x10e1
 173 /*
 174  * Multitouch gestures
 175  *  1 : enable
 176  *  2 : disable
 177  */
 178 #define BYD_CMD_SET_MULTITOUCH                  0x10e3
 179 /*
 180  * Edge motion speed
 181  *  0 : control with finger pressure
 182  *  1 - 9 : slowest to fastest
 183  */
 184 #define BYD_CMD_SET_EDGE_MOTION_SPEED           0x10e4
 185 /*
 186  * Two finger scolling function
 187  *  0 : free scrolling
 188  *  1 : free scrolling (with momentum)
 189  *  2 : edge motion
 190  *  3 : free scrolling (with momentum) + edge motion
 191  *  4 : disable
 192  */
 193 #define BYD_CMD_SET_TWO_FINGER_SCROLL_FUNC      0x10e5
 194
 195 /*
 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:
 198  */
 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
 227
 228 struct byd_data {
 229         struct timer_list timer;
 230         s32 abs_x;
 231         s32 abs_y;
 232         typeof(jiffies) last_touch_time;
 233         bool btn_left;
 234         bool btn_right;
 235         bool touch;
 236 };
 237
 238 static void byd_report_input(struct psmouse *psmouse)
 239 {
 240         struct byd_data *priv = psmouse->private;
 241         struct input_dev *dev = psmouse->dev;
 242
 243         input_report_key(dev, BTN_TOUCH, priv->touch);
 244         input_report_key(dev, BTN_TOOL_FINGER, priv->touch);
 245
 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);
 250
 251         input_sync(dev);
 252 }
 253
 254 static void byd_clear_touch(unsigned long data)
 255 {
 256         struct psmouse *psmouse = (struct psmouse *)data;
 257         struct byd_data *priv = psmouse->private;
 258
 259         serio_pause_rx(psmouse->ps2dev.serio);
 260         priv->touch = false;
 261
 262         byd_report_input(psmouse);
 263
 264         serio_continue_rx(psmouse->ps2dev.serio);
 265
 266         /*
 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.
 270          */
 271         priv->abs_x = BYD_PAD_WIDTH / 2;
 272         priv->abs_y = BYD_PAD_HEIGHT / 2;
 273 }
 274
 275 static psmouse_ret_t byd_process_byte(struct psmouse *psmouse)
 276 {
 277         struct byd_data *priv = psmouse->private;
 278         u8 *pkt = psmouse->packet;
 279
 280         if (psmouse->pktcnt > 0 && !(pkt[0] & PS2_ALWAYS_1)) {
 281                 psmouse_warn(psmouse, "Always_1 bit not 1. pkt[0] = %02x\n",
 282                              pkt[0]);
 283                 return PSMOUSE_BAD_DATA;
 284         }
 285
 286         if (psmouse->pktcnt < psmouse->pktsize)
 287                 return PSMOUSE_GOOD_DATA;
 288
 289         /* Otherwise, a full packet has been received */
 290         switch (pkt[3]) {
 291         case BYD_PACKET_ABSOLUTE:
 292                 /* Only use absolute packets for the start of movement. */
 293                 if (!priv->touch) {
 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);
 298
 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);
 302                 }
 303                 break;
 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];
 311
 312                 /* Update position based on velocity */
 313                 priv->abs_x += dx * BYD_DT;
 314                 priv->abs_y -= dy * BYD_DT;
 315
 316                 priv->touch = true;
 317                 break;
 318         }
 319         default:
 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;
 325         }
 326
 327         priv->btn_left = pkt[0] & PS2_LEFT;
 328         priv->btn_right = pkt[0] & PS2_RIGHT;
 329
 330         byd_report_input(psmouse);
 331
 332         /* Reset time since last touch. */
 333         if (priv->touch) {
 334                 priv->last_touch_time = jiffies;
 335                 mod_timer(&priv->timer, jiffies + BYD_TOUCH_TIMEOUT);
 336         }
 337
 338         return PSMOUSE_FULL_PACKET;
 339 }
 340
 341 static int byd_reset_touchpad(struct psmouse *psmouse)
 342 {
 343         struct ps2dev *ps2dev = &psmouse->ps2dev;
 344         u8 param[4];
 345         size_t i;
 346
 347         const struct {
 348                 u16 command;
 349                 u8 arg;
 350         } seq[] = {
 351                 /*
 352                  * Intellimouse initialization sequence, to get 4-byte instead
 353                  * of 3-byte packets.
 354                  */
 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 },
 360                 /*
 361                  * BYD-specific initialization, which enables absolute mode and
 362                  * (if desired), the touchpad's built-in gesture detection.
 363                  */
 364                 { 0x10E2, 0x00 },
 365                 { 0x10E0, 0x02 },
 366                 /* The touchpad should reply with 4 seemingly-random bytes */
 367                 { 0x14E0, 0x01 },
 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. */
 385                 { 0x10E0, 0x00 },
 386                 { 0x10E2, 0x01 },
 387         };
 388
 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))
 393                         return -EIO;
 394         }
 395
 396         psmouse_set_state(psmouse, PSMOUSE_ACTIVATED);
 397         return 0;
 398 }
 399
 400 static int byd_reconnect(struct psmouse *psmouse)
 401 {
 402         int retry = 0, error = 0;
 403
 404         psmouse_dbg(psmouse, "Reconnect\n");
 405         do {
 406                 psmouse_reset(psmouse);
 407                 if (retry)
 408                         ssleep(1);
 409                 error = byd_detect(psmouse, 0);
 410         } while (error && ++retry < 3);
 411
 412         if (error)
 413                 return error;
 414
 415         psmouse_dbg(psmouse, "Reconnected after %d attempts\n", retry);
 416
 417         error = byd_reset_touchpad(psmouse);
 418         if (error) {
 419                 psmouse_err(psmouse, "Unable to initialize device\n");
 420                 return error;
 421         }
 422
 423         return 0;
 424 }
 425
 426 static void byd_disconnect(struct psmouse *psmouse)
 427 {
 428         struct byd_data *priv = psmouse->private;
 429
 430         if (priv) {
 431                 del_timer(&priv->timer);
 432                 kfree(psmouse->private);
 433                 psmouse->private = NULL;
 434         }
 435 }
 436
 437 int byd_detect(struct psmouse *psmouse, bool set_properties)
 438 {
 439         struct ps2dev *ps2dev = &psmouse->ps2dev;
 440         u8 param[4] = {0x03, 0x00, 0x00, 0x00};
 441
 442         if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
 443                 return -1;
 444         if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
 445                 return -1;
 446         if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
 447                 return -1;
 448         if (ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES))
 449                 return -1;
 450         if (ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO))
 451                 return -1;
 452
 453         if (param[1] != 0x03 || param[2] != 0x64)
 454                 return -ENODEV;
 455
 456         psmouse_dbg(psmouse, "BYD touchpad detected\n");
 457
 458         if (set_properties) {
 459                 psmouse->vendor = "BYD";
 460                 psmouse->name = "TouchPad";
 461         }
 462
 463         return 0;
 464 }
 465
 466 int byd_init(struct psmouse *psmouse)
 467 {
 468         struct input_dev *dev = psmouse->dev;
 469         struct byd_data *priv;
 470
 471         if (psmouse_reset(psmouse))
 472                 return -EIO;
 473
 474         if (byd_reset_touchpad(psmouse))
 475                 return -EIO;
 476
 477         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 478         if (!priv)
 479                 return -ENOMEM;
 480
 481         setup_timer(&priv->timer, byd_clear_touch, (unsigned long) psmouse);
 482
 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;
 489
 490         __set_bit(INPUT_PROP_POINTER, dev->propbit);
 491         /* Touchpad */
 492         __set_bit(BTN_TOUCH, dev->keybit);
 493         __set_bit(BTN_TOOL_FINGER, dev->keybit);
 494         /* Buttons */
 495         __set_bit(BTN_LEFT, dev->keybit);
 496         __set_bit(BTN_RIGHT, dev->keybit);
 497         __clear_bit(BTN_MIDDLE, dev->keybit);
 498
 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);
 509
 510         return 0;
 511 }