drivers/input/mouse/synaptics.c

   1 /*
   2  * Synaptics TouchPad PS/2 mouse driver
   3  *
   4  *   2003 Dmitry Torokhov <dtor@mail.ru>
   5  *     Added support for pass-through port. Special thanks to Peter Berg Larsen
   6  *     for explaining various Synaptics quirks.
   7  *
   8  *   2003 Peter Osterlund <petero2@telia.com>
   9  *     Ported to 2.5 input device infrastructure.
  10  *
  11  *   Copyright (C) 2001 Stefan Gmeiner <riddlebox@freesurf.ch>
  12  *     start merging tpconfig and gpm code to a xfree-input module
  13  *     adding some changes and extensions (ex. 3rd and 4th button)
  14  *
  15  *   Copyright (c) 1997 C. Scott Ananian <cananian@alumni.priceton.edu>
  16  *   Copyright (c) 1998-2000 Bruce Kalk <kall@compass.com>
  17  *     code for the special synaptics commands (from the tpconfig-source)
  18  *
  19  * This program is free software; you can redistribute it and/or modify it
  20  * under the terms of the GNU General Public License version 2 as published by
  21  * the Free Software Foundation.
  22  *
  23  * Trademarks are the property of their respective owners.
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/delay.h>
  28 #include <linux/dmi.h>
  29 #include <linux/input/mt.h>
  30 #include <linux/serio.h>
  31 #include <linux/libps2.h>
  32 #include <linux/slab.h>
  33 #include "psmouse.h"
  34 #include "synaptics.h"
  35
  36 /*
  37  * The x/y limits are taken from the Synaptics TouchPad interfacing Guide,
  38  * section 2.3.2, which says that they should be valid regardless of the
  39  * actual size of the sensor.
  40  * Note that newer firmware allows querying device for maximum useable
  41  * coordinates.
  42  */
  43 #define XMIN 0
  44 #define XMAX 6143
  45 #define YMIN 0
  46 #define YMAX 6143
  47 #define XMIN_NOMINAL 1472
  48 #define XMAX_NOMINAL 5472
  49 #define YMIN_NOMINAL 1408
  50 #define YMAX_NOMINAL 4448
  51
  52 /* Size in bits of absolute position values reported by the hardware */
  53 #define ABS_POS_BITS 13
  54
  55 /*
  56  * These values should represent the absolute maximum value that will
  57  * be reported for a positive position value. Some Synaptics firmware
  58  * uses this value to indicate a finger near the edge of the touchpad
  59  * whose precise position cannot be determined.
  60  *
  61  * At least one touchpad is known to report positions in excess of this
  62  * value which are actually negative values truncated to the 13-bit
  63  * reporting range. These values have never been observed to be lower
  64  * than 8184 (i.e. -8), so we treat all values greater than 8176 as
  65  * negative and any other value as positive.
  66  */
  67 #define X_MAX_POSITIVE 8176
  68 #define Y_MAX_POSITIVE 8176
  69
  70 /*****************************************************************************
  71  *      Stuff we need even when we do not want native Synaptics support
  72  ****************************************************************************/
  73
  74 /*
  75  * Set the synaptics touchpad mode byte by special commands
  76  */
  77 static int synaptics_mode_cmd(struct psmouse *psmouse, unsigned char mode)
  78 {
  79         unsigned char param[1];
  80
  81         if (psmouse_sliced_command(psmouse, mode))
  82                 return -1;
  83         param[0] = SYN_PS_SET_MODE2;
  84         if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_SETRATE))
  85                 return -1;
  86         return 0;
  87 }
  88
  89 int synaptics_detect(struct psmouse *psmouse, bool set_properties)
  90 {
  91         struct ps2dev *ps2dev = &psmouse->ps2dev;
  92         unsigned char param[4];
  93
  94         param[0] = 0;
  95
  96         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
  97         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
  98         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
  99         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 100         ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
 101
 102         if (param[1] != 0x47)
 103                 return -ENODEV;
 104
 105         if (set_properties) {
 106                 psmouse->vendor = "Synaptics";
 107                 psmouse->name = "TouchPad";
 108         }
 109
 110         return 0;
 111 }
 112
 113 void synaptics_reset(struct psmouse *psmouse)
 114 {
 115         /* reset touchpad back to relative mode, gestures enabled */
 116         synaptics_mode_cmd(psmouse, 0);
 117 }
 118
 119 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS
 120
 121 static bool cr48_profile_sensor;
 122
 123 struct min_max_quirk {
 124         const char * const *pnp_ids;
 125         int x_min, x_max, y_min, y_max;
 126 };
 127
 128 static const struct min_max_quirk min_max_pnpid_table[] = {
 129         {
 130                 (const char * const []){"LEN0033", NULL},
 131                 1024, 5052, 2258, 4832
 132         },
 133         {
 134                 (const char * const []){"LEN0035", "LEN0042", NULL},
 135                 1232, 5710, 1156, 4696
 136         },
 137         {
 138                 (const char * const []){"LEN0034", "LEN0036", "LEN2002",
 139                                         "LEN2004", NULL},
 140                 1024, 5112, 2024, 4832
 141         },
 142         {
 143                 (const char * const []){"LEN2001", NULL},
 144                 1024, 5022, 2508, 4832
 145         },
 146         { }
 147 };
 148
 149 /* This list has been kindly provided by Synaptics. */
 150 static const char * const topbuttonpad_pnp_ids[] = {
 151         "LEN0017",
 152         "LEN0018",
 153         "LEN0019",
 154         "LEN0023",
 155         "LEN002A",
 156         "LEN002B",
 157         "LEN002C",
 158         "LEN002D",
 159         "LEN002E",
 160         "LEN0033", /* Helix */
 161         "LEN0034", /* T431s, L440, L540, T540, W540, X1 Carbon 2nd */
 162         "LEN0035", /* X240 */
 163         "LEN0036", /* T440 */
 164         "LEN0037",
 165         "LEN0038",
 166         "LEN0041",
 167         "LEN0042", /* Yoga */
 168         "LEN0045",
 169         "LEN0046",
 170         "LEN0047",
 171         "LEN0048",
 172         "LEN0049",
 173         "LEN2000",
 174         "LEN2001", /* Edge E431 */
 175         "LEN2002", /* Edge E531 */
 176         "LEN2003",
 177         "LEN2004", /* L440 */
 178         "LEN2005",
 179         "LEN2006",
 180         "LEN2007",
 181         "LEN2008",
 182         "LEN2009",
 183         "LEN200A",
 184         "LEN200B",
 185         NULL
 186 };
 187
 188 static bool matches_pnp_id(struct psmouse *psmouse, const char * const ids[])
 189 {
 190         int i;
 191
 192         if (!strncmp(psmouse->ps2dev.serio->firmware_id, "PNP:", 4))
 193                 for (i = 0; ids[i]; i++)
 194                         if (strstr(psmouse->ps2dev.serio->firmware_id, ids[i]))
 195                                 return true;
 196
 197         return false;
 198 }
 199
 200 /*****************************************************************************
 201  *      Synaptics communications functions
 202  ****************************************************************************/
 203
 204 /*
 205  * Synaptics touchpads report the y coordinate from bottom to top, which is
 206  * opposite from what userspace expects.
 207  * This function is used to invert y before reporting.
 208  */
 209 static int synaptics_invert_y(int y)
 210 {
 211         return YMAX_NOMINAL + YMIN_NOMINAL - y;
 212 }
 213
 214 /*
 215  * Send a command to the synpatics touchpad by special commands
 216  */
 217 static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c, unsigned char *param)
 218 {
 219         if (psmouse_sliced_command(psmouse, c))
 220                 return -1;
 221         if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO))
 222                 return -1;
 223         return 0;
 224 }
 225
 226 /*
 227  * Read the model-id bytes from the touchpad
 228  * see also SYN_MODEL_* macros
 229  */
 230 static int synaptics_model_id(struct psmouse *psmouse)
 231 {
 232         struct synaptics_data *priv = psmouse->private;
 233         unsigned char mi[3];
 234
 235         if (synaptics_send_cmd(psmouse, SYN_QUE_MODEL, mi))
 236                 return -1;
 237         priv->model_id = (mi[0]<<16) | (mi[1]<<8) | mi[2];
 238         return 0;
 239 }
 240
 241 /*
 242  * Read the board id from the touchpad
 243  * The board id is encoded in the "QUERY MODES" response
 244  */
 245 static int synaptics_board_id(struct psmouse *psmouse)
 246 {
 247         struct synaptics_data *priv = psmouse->private;
 248         unsigned char bid[3];
 249
 250         if (synaptics_send_cmd(psmouse, SYN_QUE_MODES, bid))
 251                 return -1;
 252         priv->board_id = ((bid[0] & 0xfc) << 6) | bid[1];
 253         return 0;
 254 }
 255
 256 /*
 257  * Read the firmware id from the touchpad
 258  */
 259 static int synaptics_firmware_id(struct psmouse *psmouse)
 260 {
 261         struct synaptics_data *priv = psmouse->private;
 262         unsigned char fwid[3];
 263
 264         if (synaptics_send_cmd(psmouse, SYN_QUE_FIRMWARE_ID, fwid))
 265                 return -1;
 266         priv->firmware_id = (fwid[0] << 16) | (fwid[1] << 8) | fwid[2];
 267         return 0;
 268 }
 269
 270 /*
 271  * Read the capability-bits from the touchpad
 272  * see also the SYN_CAP_* macros
 273  */
 274 static int synaptics_capability(struct psmouse *psmouse)
 275 {
 276         struct synaptics_data *priv = psmouse->private;
 277         unsigned char cap[3];
 278
 279         if (synaptics_send_cmd(psmouse, SYN_QUE_CAPABILITIES, cap))
 280                 return -1;
 281         priv->capabilities = (cap[0] << 16) | (cap[1] << 8) | cap[2];
 282         priv->ext_cap = priv->ext_cap_0c = 0;
 283
 284         /*
 285          * Older firmwares had submodel ID fixed to 0x47
 286          */
 287         if (SYN_ID_FULL(priv->identity) < 0x705 &&
 288             SYN_CAP_SUBMODEL_ID(priv->capabilities) != 0x47) {
 289                 return -1;
 290         }
 291
 292         /*
 293          * Unless capExtended is set the rest of the flags should be ignored
 294          */
 295         if (!SYN_CAP_EXTENDED(priv->capabilities))
 296                 priv->capabilities = 0;
 297
 298         if (SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 1) {
 299                 if (synaptics_send_cmd(psmouse, SYN_QUE_EXT_CAPAB, cap)) {
 300                         psmouse_warn(psmouse,
 301                                      "device claims to have extended capabilities, but I'm not able to read them.\n");
 302                 } else {
 303                         priv->ext_cap = (cap[0] << 16) | (cap[1] << 8) | cap[2];
 304
 305                         /*
 306                          * if nExtBtn is greater than 8 it should be considered
 307                          * invalid and treated as 0
 308                          */
 309                         if (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) > 8)
 310                                 priv->ext_cap &= 0xff0fff;
 311                 }
 312         }
 313
 314         if (SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 4) {
 315                 if (synaptics_send_cmd(psmouse, SYN_QUE_EXT_CAPAB_0C, cap)) {
 316                         psmouse_warn(psmouse,
 317                                      "device claims to have extended capability 0x0c, but I'm not able to read it.\n");
 318                 } else {
 319                         priv->ext_cap_0c = (cap[0] << 16) | (cap[1] << 8) | cap[2];
 320                 }
 321         }
 322
 323         return 0;
 324 }
 325
 326 /*
 327  * Identify Touchpad
 328  * See also the SYN_ID_* macros
 329  */
 330 static int synaptics_identify(struct psmouse *psmouse)
 331 {
 332         struct synaptics_data *priv = psmouse->private;
 333         unsigned char id[3];
 334
 335         if (synaptics_send_cmd(psmouse, SYN_QUE_IDENTIFY, id))
 336                 return -1;
 337         priv->identity = (id[0]<<16) | (id[1]<<8) | id[2];
 338         if (SYN_ID_IS_SYNAPTICS(priv->identity))
 339                 return 0;
 340         return -1;
 341 }
 342
 343 /*
 344  * Read touchpad resolution and maximum reported coordinates
 345  * Resolution is left zero if touchpad does not support the query
 346  */
 347
 348 static int synaptics_resolution(struct psmouse *psmouse)
 349 {
 350         struct synaptics_data *priv = psmouse->private;
 351         unsigned char resp[3];
 352         int i;
 353
 354         if (SYN_ID_MAJOR(priv->identity) < 4)
 355                 return 0;
 356
 357         if (synaptics_send_cmd(psmouse, SYN_QUE_RESOLUTION, resp) == 0) {
 358                 if (resp[0] != 0 && (resp[1] & 0x80) && resp[2] != 0) {
 359                         priv->x_res = resp[0]; /* x resolution in units/mm */
 360                         priv->y_res = resp[2]; /* y resolution in units/mm */
 361                 }
 362         }
 363
 364         for (i = 0; min_max_pnpid_table[i].pnp_ids; i++) {
 365                 if (matches_pnp_id(psmouse, min_max_pnpid_table[i].pnp_ids)) {
 366                         priv->x_min = min_max_pnpid_table[i].x_min;
 367                         priv->x_max = min_max_pnpid_table[i].x_max;
 368                         priv->y_min = min_max_pnpid_table[i].y_min;
 369                         priv->y_max = min_max_pnpid_table[i].y_max;
 370                         return 0;
 371                 }
 372         }
 373
 374         if (SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 5 &&
 375             SYN_CAP_MAX_DIMENSIONS(priv->ext_cap_0c)) {
 376                 if (synaptics_send_cmd(psmouse, SYN_QUE_EXT_MAX_COORDS, resp)) {
 377                         psmouse_warn(psmouse,
 378                                      "device claims to have max coordinates query, but I'm not able to read it.\n");
 379                 } else {
 380                         priv->x_max = (resp[0] << 5) | ((resp[1] & 0x0f) << 1);
 381                         priv->y_max = (resp[2] << 5) | ((resp[1] & 0xf0) >> 3);
 382                 }
 383         }
 384
 385         if (SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 7 &&
 386             SYN_CAP_MIN_DIMENSIONS(priv->ext_cap_0c)) {
 387                 if (synaptics_send_cmd(psmouse, SYN_QUE_EXT_MIN_COORDS, resp)) {
 388                         psmouse_warn(psmouse,
 389                                      "device claims to have min coordinates query, but I'm not able to read it.\n");
 390                 } else {
 391                         priv->x_min = (resp[0] << 5) | ((resp[1] & 0x0f) << 1);
 392                         priv->y_min = (resp[2] << 5) | ((resp[1] & 0xf0) >> 3);
 393                 }
 394         }
 395
 396         return 0;
 397 }
 398
 399 static int synaptics_query_hardware(struct psmouse *psmouse)
 400 {
 401         if (synaptics_identify(psmouse))
 402                 return -1;
 403         if (synaptics_model_id(psmouse))
 404                 return -1;
 405         if (synaptics_firmware_id(psmouse))
 406                 return -1;
 407         if (synaptics_board_id(psmouse))
 408                 return -1;
 409         if (synaptics_capability(psmouse))
 410                 return -1;
 411         if (synaptics_resolution(psmouse))
 412                 return -1;
 413
 414         return 0;
 415 }
 416
 417 static int synaptics_set_advanced_gesture_mode(struct psmouse *psmouse)
 418 {
 419         static unsigned char param = 0xc8;
 420         struct synaptics_data *priv = psmouse->private;
 421
 422         if (!(SYN_CAP_ADV_GESTURE(priv->ext_cap_0c) ||
 423               SYN_CAP_IMAGE_SENSOR(priv->ext_cap_0c)))
 424                 return 0;
 425
 426         if (psmouse_sliced_command(psmouse, SYN_QUE_MODEL))
 427                 return -1;
 428
 429         if (ps2_command(&psmouse->ps2dev, &param, PSMOUSE_CMD_SETRATE))
 430                 return -1;
 431
 432         /* Advanced gesture mode also sends multi finger data */
 433         priv->capabilities |= BIT(1);
 434
 435         return 0;
 436 }
 437
 438 static int synaptics_set_mode(struct psmouse *psmouse)
 439 {
 440         struct synaptics_data *priv = psmouse->private;
 441
 442         priv->mode = 0;
 443         if (priv->absolute_mode)
 444                 priv->mode |= SYN_BIT_ABSOLUTE_MODE;
 445         if (priv->disable_gesture)
 446                 priv->mode |= SYN_BIT_DISABLE_GESTURE;
 447         if (psmouse->rate >= 80)
 448                 priv->mode |= SYN_BIT_HIGH_RATE;
 449         if (SYN_CAP_EXTENDED(priv->capabilities))
 450                 priv->mode |= SYN_BIT_W_MODE;
 451
 452         if (synaptics_mode_cmd(psmouse, priv->mode))
 453                 return -1;
 454
 455         if (priv->absolute_mode &&
 456             synaptics_set_advanced_gesture_mode(psmouse)) {
 457                 psmouse_err(psmouse, "Advanced gesture mode init failed.\n");
 458                 return -1;
 459         }
 460
 461         return 0;
 462 }
 463
 464 static void synaptics_set_rate(struct psmouse *psmouse, unsigned int rate)
 465 {
 466         struct synaptics_data *priv = psmouse->private;
 467
 468         if (rate >= 80) {
 469                 priv->mode |= SYN_BIT_HIGH_RATE;
 470                 psmouse->rate = 80;
 471         } else {
 472                 priv->mode &= ~SYN_BIT_HIGH_RATE;
 473                 psmouse->rate = 40;
 474         }
 475
 476         synaptics_mode_cmd(psmouse, priv->mode);
 477 }
 478
 479 /*****************************************************************************
 480  *      Synaptics pass-through PS/2 port support
 481  ****************************************************************************/
 482 static int synaptics_pt_write(struct serio *serio, unsigned char c)
 483 {
 484         struct psmouse *parent = serio_get_drvdata(serio->parent);
 485         char rate_param = SYN_PS_CLIENT_CMD; /* indicates that we want pass-through port */
 486
 487         if (psmouse_sliced_command(parent, c))
 488                 return -1;
 489         if (ps2_command(&parent->ps2dev, &rate_param, PSMOUSE_CMD_SETRATE))
 490                 return -1;
 491         return 0;
 492 }
 493
 494 static int synaptics_pt_start(struct serio *serio)
 495 {
 496         struct psmouse *parent = serio_get_drvdata(serio->parent);
 497         struct synaptics_data *priv = parent->private;
 498
 499         serio_pause_rx(parent->ps2dev.serio);
 500         priv->pt_port = serio;
 501         serio_continue_rx(parent->ps2dev.serio);
 502
 503         return 0;
 504 }
 505
 506 static void synaptics_pt_stop(struct serio *serio)
 507 {
 508         struct psmouse *parent = serio_get_drvdata(serio->parent);
 509         struct synaptics_data *priv = parent->private;
 510
 511         serio_pause_rx(parent->ps2dev.serio);
 512         priv->pt_port = NULL;
 513         serio_continue_rx(parent->ps2dev.serio);
 514 }
 515
 516 static int synaptics_is_pt_packet(unsigned char *buf)
 517 {
 518         return (buf[0] & 0xFC) == 0x84 && (buf[3] & 0xCC) == 0xC4;
 519 }
 520
 521 static void synaptics_pass_pt_packet(struct serio *ptport, unsigned char *packet)
 522 {
 523         struct psmouse *child = serio_get_drvdata(ptport);
 524
 525         if (child && child->state == PSMOUSE_ACTIVATED) {
 526                 serio_interrupt(ptport, packet[1], 0);
 527                 serio_interrupt(ptport, packet[4], 0);
 528                 serio_interrupt(ptport, packet[5], 0);
 529                 if (child->pktsize == 4)
 530                         serio_interrupt(ptport, packet[2], 0);
 531         } else
 532                 serio_interrupt(ptport, packet[1], 0);
 533 }
 534
 535 static void synaptics_pt_activate(struct psmouse *psmouse)
 536 {
 537         struct synaptics_data *priv = psmouse->private;
 538         struct psmouse *child = serio_get_drvdata(priv->pt_port);
 539
 540         /* adjust the touchpad to child's choice of protocol */
 541         if (child) {
 542                 if (child->pktsize == 4)
 543                         priv->mode |= SYN_BIT_FOUR_BYTE_CLIENT;
 544                 else
 545                         priv->mode &= ~SYN_BIT_FOUR_BYTE_CLIENT;
 546
 547                 if (synaptics_mode_cmd(psmouse, priv->mode))
 548                         psmouse_warn(psmouse,
 549                                      "failed to switch guest protocol\n");
 550         }
 551 }
 552
 553 static void synaptics_pt_create(struct psmouse *psmouse)
 554 {
 555         struct serio *serio;
 556
 557         serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
 558         if (!serio) {
 559                 psmouse_err(psmouse,
 560                             "not enough memory for pass-through port\n");
 561                 return;
 562         }
 563
 564         serio->id.type = SERIO_PS_PSTHRU;
 565         strlcpy(serio->name, "Synaptics pass-through", sizeof(serio->name));
 566         strlcpy(serio->phys, "synaptics-pt/serio0", sizeof(serio->name));
 567         serio->write = synaptics_pt_write;
 568         serio->start = synaptics_pt_start;
 569         serio->stop = synaptics_pt_stop;
 570         serio->parent = psmouse->ps2dev.serio;
 571
 572         psmouse->pt_activate = synaptics_pt_activate;
 573
 574         psmouse_info(psmouse, "serio: %s port at %s\n",
 575                      serio->name, psmouse->phys);
 576         serio_register_port(serio);
 577 }
 578
 579 /*****************************************************************************
 580  *      Functions to interpret the absolute mode packets
 581  ****************************************************************************/
 582
 583 static void synaptics_mt_state_set(struct synaptics_mt_state *state, int count,
 584                                    int sgm, int agm)
 585 {
 586         state->count = count;
 587         state->sgm = sgm;
 588         state->agm = agm;
 589 }
 590
 591 static void synaptics_parse_agm(const unsigned char buf[],
 592                                 struct synaptics_data *priv,
 593                                 struct synaptics_hw_state *hw)
 594 {
 595         struct synaptics_hw_state *agm = &priv->agm;
 596         int agm_packet_type;
 597
 598         agm_packet_type = (buf[5] & 0x30) >> 4;
 599         switch (agm_packet_type) {
 600         case 1:
 601                 /* Gesture packet: (x, y, z) half resolution */
 602                 agm->w = hw->w;
 603                 agm->x = (((buf[4] & 0x0f) << 8) | buf[1]) << 1;
 604                 agm->y = (((buf[4] & 0xf0) << 4) | buf[2]) << 1;
 605                 agm->z = ((buf[3] & 0x30) | (buf[5] & 0x0f)) << 1;
 606                 break;
 607
 608         case 2:
 609                 /* AGM-CONTACT packet: (count, sgm, agm) */
 610                 synaptics_mt_state_set(&agm->mt_state, buf[1], buf[2], buf[4]);
 611                 break;
 612
 613         default:
 614                 break;
 615         }
 616
 617         /* Record that at least one AGM has been received since last SGM */
 618         priv->agm_pending = true;
 619 }
 620
 621 static int synaptics_parse_hw_state(const unsigned char buf[],
 622                                     struct synaptics_data *priv,
 623                                     struct synaptics_hw_state *hw)
 624 {
 625         memset(hw, 0, sizeof(struct synaptics_hw_state));
 626
 627         if (SYN_MODEL_NEWABS(priv->model_id)) {
 628                 hw->w = (((buf[0] & 0x30) >> 2) |
 629                          ((buf[0] & 0x04) >> 1) |
 630                          ((buf[3] & 0x04) >> 2));
 631
 632                 hw->left  = (buf[0] & 0x01) ? 1 : 0;
 633                 hw->right = (buf[0] & 0x02) ? 1 : 0;
 634
 635                 if (SYN_CAP_CLICKPAD(priv->ext_cap_0c)) {
 636                         /*
 637                          * Clickpad's button is transmitted as middle button,
 638                          * however, since it is primary button, we will report
 639                          * it as BTN_LEFT.
 640                          */
 641                         hw->left = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
 642
 643                 } else if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities)) {
 644                         hw->middle = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
 645                         if (hw->w == 2)
 646                                 hw->scroll = (signed char)(buf[1]);
 647                 }
 648
 649                 if (SYN_CAP_FOUR_BUTTON(priv->capabilities)) {
 650                         hw->up   = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
 651                         hw->down = ((buf[0] ^ buf[3]) & 0x02) ? 1 : 0;
 652                 }
 653
 654                 if ((SYN_CAP_ADV_GESTURE(priv->ext_cap_0c) ||
 655                         SYN_CAP_IMAGE_SENSOR(priv->ext_cap_0c)) &&
 656                     hw->w == 2) {
 657                         synaptics_parse_agm(buf, priv, hw);
 658                         return 1;
 659                 }
 660
 661                 hw->x = (((buf[3] & 0x10) << 8) |
 662                          ((buf[1] & 0x0f) << 8) |
 663                          buf[4]);
 664                 hw->y = (((buf[3] & 0x20) << 7) |
 665                          ((buf[1] & 0xf0) << 4) |
 666                          buf[5]);
 667                 hw->z = buf[2];
 668
 669                 if (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) &&
 670                     ((buf[0] ^ buf[3]) & 0x02)) {
 671                         switch (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) & ~0x01) {
 672                         default:
 673                                 /*
 674                                  * if nExtBtn is greater than 8 it should be
 675                                  * considered invalid and treated as 0
 676                                  */
 677                                 break;
 678                         case 8:
 679                                 hw->ext_buttons |= ((buf[5] & 0x08)) ? 0x80 : 0;
 680                                 hw->ext_buttons |= ((buf[4] & 0x08)) ? 0x40 : 0;
 681                         case 6:
 682                                 hw->ext_buttons |= ((buf[5] & 0x04)) ? 0x20 : 0;
 683                                 hw->ext_buttons |= ((buf[4] & 0x04)) ? 0x10 : 0;
 684                         case 4:
 685                                 hw->ext_buttons |= ((buf[5] & 0x02)) ? 0x08 : 0;
 686                                 hw->ext_buttons |= ((buf[4] & 0x02)) ? 0x04 : 0;
 687                         case 2:
 688                                 hw->ext_buttons |= ((buf[5] & 0x01)) ? 0x02 : 0;
 689                                 hw->ext_buttons |= ((buf[4] & 0x01)) ? 0x01 : 0;
 690                         }
 691                 }
 692         } else {
 693                 hw->x = (((buf[1] & 0x1f) << 8) | buf[2]);
 694                 hw->y = (((buf[4] & 0x1f) << 8) | buf[5]);
 695
 696                 hw->z = (((buf[0] & 0x30) << 2) | (buf[3] & 0x3F));
 697                 hw->w = (((buf[1] & 0x80) >> 4) | ((buf[0] & 0x04) >> 1));
 698
 699                 hw->left  = (buf[0] & 0x01) ? 1 : 0;
 700                 hw->right = (buf[0] & 0x02) ? 1 : 0;
 701         }
 702
 703         /*
 704          * Convert wrap-around values to negative. (X|Y)_MAX_POSITIVE
 705          * is used by some firmware to indicate a finger at the edge of
 706          * the touchpad whose precise position cannot be determined, so
 707          * convert these values to the maximum axis value.
 708          */
 709         if (hw->x > X_MAX_POSITIVE)
 710                 hw->x -= 1 << ABS_POS_BITS;
 711         else if (hw->x == X_MAX_POSITIVE)
 712                 hw->x = XMAX;
 713
 714         if (hw->y > Y_MAX_POSITIVE)
 715                 hw->y -= 1 << ABS_POS_BITS;
 716         else if (hw->y == Y_MAX_POSITIVE)
 717                 hw->y = YMAX;
 718
 719         return 0;
 720 }
 721
 722 static void synaptics_report_semi_mt_slot(struct input_dev *dev, int slot,
 723                                           bool active, int x, int y)
 724 {
 725         input_mt_slot(dev, slot);
 726         input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
 727         if (active) {
 728                 input_report_abs(dev, ABS_MT_POSITION_X, x);
 729                 input_report_abs(dev, ABS_MT_POSITION_Y, synaptics_invert_y(y));
 730         }
 731 }
 732
 733 static void synaptics_report_semi_mt_data(struct input_dev *dev,
 734                                           const struct synaptics_hw_state *a,
 735                                           const struct synaptics_hw_state *b,
 736                                           int num_fingers)
 737 {
 738         if (num_fingers >= 2) {
 739                 synaptics_report_semi_mt_slot(dev, 0, true, min(a->x, b->x),
 740                                               min(a->y, b->y));
 741                 synaptics_report_semi_mt_slot(dev, 1, true, max(a->x, b->x),
 742                                               max(a->y, b->y));
 743         } else if (num_fingers == 1) {
 744                 synaptics_report_semi_mt_slot(dev, 0, true, a->x, a->y);
 745                 synaptics_report_semi_mt_slot(dev, 1, false, 0, 0);
 746         } else {
 747                 synaptics_report_semi_mt_slot(dev, 0, false, 0, 0);
 748                 synaptics_report_semi_mt_slot(dev, 1, false, 0, 0);
 749         }
 750 }
 751
 752 static void synaptics_report_buttons(struct psmouse *psmouse,
 753                                      const struct synaptics_hw_state *hw)
 754 {
 755         struct input_dev *dev = psmouse->dev;
 756         struct synaptics_data *priv = psmouse->private;
 757         int i;
 758
 759         input_report_key(dev, BTN_LEFT, hw->left);
 760         input_report_key(dev, BTN_RIGHT, hw->right);
 761
 762         if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities))
 763                 input_report_key(dev, BTN_MIDDLE, hw->middle);
 764
 765         if (SYN_CAP_FOUR_BUTTON(priv->capabilities)) {
 766                 input_report_key(dev, BTN_FORWARD, hw->up);
 767                 input_report_key(dev, BTN_BACK, hw->down);
 768         }
 769
 770         for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap); i++)
 771                 input_report_key(dev, BTN_0 + i, hw->ext_buttons & (1 << i));
 772 }
 773
 774 static void synaptics_report_slot(struct input_dev *dev, int slot,
 775                                   const struct synaptics_hw_state *hw)
 776 {
 777         input_mt_slot(dev, slot);
 778         input_mt_report_slot_state(dev, MT_TOOL_FINGER, (hw != NULL));
 779         if (!hw)
 780                 return;
 781
 782         input_report_abs(dev, ABS_MT_POSITION_X, hw->x);
 783         input_report_abs(dev, ABS_MT_POSITION_Y, synaptics_invert_y(hw->y));
 784         input_report_abs(dev, ABS_MT_PRESSURE, hw->z);
 785 }
 786
 787 static void synaptics_report_mt_data(struct psmouse *psmouse,
 788                                      struct synaptics_mt_state *mt_state,
 789                                      const struct synaptics_hw_state *sgm)
 790 {
 791         struct input_dev *dev = psmouse->dev;
 792         struct synaptics_data *priv = psmouse->private;
 793         struct synaptics_hw_state *agm = &priv->agm;
 794         struct synaptics_mt_state *old = &priv->mt_state;
 795
 796         switch (mt_state->count) {
 797         case 0:
 798                 synaptics_report_slot(dev, 0, NULL);
 799                 synaptics_report_slot(dev, 1, NULL);
 800                 break;
 801         case 1:
 802                 if (mt_state->sgm == -1) {
 803                         synaptics_report_slot(dev, 0, NULL);
 804                         synaptics_report_slot(dev, 1, NULL);
 805                 } else if (mt_state->sgm == 0) {
 806                         synaptics_report_slot(dev, 0, sgm);
 807                         synaptics_report_slot(dev, 1, NULL);
 808                 } else {
 809                         synaptics_report_slot(dev, 0, NULL);
 810                         synaptics_report_slot(dev, 1, sgm);
 811                 }
 812                 break;
 813         default:
 814                 /*
 815                  * If the finger slot contained in SGM is valid, and either
 816                  * hasn't changed, or is new, or the old SGM has now moved to
 817                  * AGM, then report SGM in MTB slot 0.
 818                  * Otherwise, empty MTB slot 0.
 819                  */
 820                 if (mt_state->sgm != -1 &&
 821                     (mt_state->sgm == old->sgm ||
 822                      old->sgm == -1 || mt_state->agm == old->sgm))
 823                         synaptics_report_slot(dev, 0, sgm);
 824                 else
 825                         synaptics_report_slot(dev, 0, NULL);
 826
 827                 /*
 828                  * If the finger slot contained in AGM is valid, and either
 829                  * hasn't changed, or is new, then report AGM in MTB slot 1.
 830                  * Otherwise, empty MTB slot 1.
 831                  *
 832                  * However, in the case where the AGM is new, make sure that
 833                  * that it is either the same as the old SGM, or there was no
 834                  * SGM.
 835                  *
 836                  * Otherwise, if the SGM was just 1, and the new AGM is 2, then
 837                  * the new AGM will keep the old SGM's tracking ID, which can
 838                  * cause apparent drumroll.  This happens if in the following
 839                  * valid finger sequence:
 840                  *
 841                  *  Action                 SGM  AGM (MTB slot:Contact)
 842                  *  1. Touch contact 0    (0:0)
 843                  *  2. Touch contact 1    (0:0, 1:1)
 844                  *  3. Lift  contact 0    (1:1)
 845                  *  4. Touch contacts 2,3 (0:2, 1:3)
 846                  *
 847                  * In step 4, contact 3, in AGM must not be given the same
 848                  * tracking ID as contact 1 had in step 3.  To avoid this,
 849                  * the first agm with contact 3 is dropped and slot 1 is
 850                  * invalidated (tracking ID = -1).
 851                  */
 852                 if (mt_state->agm != -1 &&
 853                     (mt_state->agm == old->agm ||
 854                      (old->agm == -1 &&
 855                       (old->sgm == -1 || mt_state->agm == old->sgm))))
 856                         synaptics_report_slot(dev, 1, agm);
 857                 else
 858                         synaptics_report_slot(dev, 1, NULL);
 859                 break;
 860         }
 861
 862         /* Don't use active slot count to generate BTN_TOOL events. */
 863         input_mt_report_pointer_emulation(dev, false);
 864
 865         /* Send the number of fingers reported by touchpad itself. */
 866         input_mt_report_finger_count(dev, mt_state->count);
 867
 868         synaptics_report_buttons(psmouse, sgm);
 869
 870         input_sync(dev);
 871 }
 872
 873 /* Handle case where mt_state->count = 0 */
 874 static void synaptics_image_sensor_0f(struct synaptics_data *priv,
 875                                       struct synaptics_mt_state *mt_state)
 876 {
 877         synaptics_mt_state_set(mt_state, 0, -1, -1);
 878         priv->mt_state_lost = false;
 879 }
 880
 881 /* Handle case where mt_state->count = 1 */
 882 static void synaptics_image_sensor_1f(struct synaptics_data *priv,
 883                                       struct synaptics_mt_state *mt_state)
 884 {
 885         struct synaptics_hw_state *agm = &priv->agm;
 886         struct synaptics_mt_state *old = &priv->mt_state;
 887
 888         /*
 889          * If the last AGM was (0,0,0), and there is only one finger left,
 890          * then we absolutely know that SGM contains slot 0, and all other
 891          * fingers have been removed.
 892          */
 893         if (priv->agm_pending && agm->z == 0) {
 894                 synaptics_mt_state_set(mt_state, 1, 0, -1);
 895                 priv->mt_state_lost = false;
 896                 return;
 897         }
 898
 899         switch (old->count) {
 900         case 0:
 901                 synaptics_mt_state_set(mt_state, 1, 0, -1);
 902                 break;
 903         case 1:
 904                 /*
 905                  * If mt_state_lost, then the previous transition was 3->1,
 906                  * and SGM now contains either slot 0 or 1, but we don't know
 907                  * which.  So, we just assume that the SGM now contains slot 1.
 908                  *
 909                  * If pending AGM and either:
 910                  *   (a) the previous SGM slot contains slot 0, or
 911                  *   (b) there was no SGM slot
 912                  * then, the SGM now contains slot 1
 913                  *
 914                  * Case (a) happens with very rapid "drum roll" gestures, where
 915                  * slot 0 finger is lifted and a new slot 1 finger touches
 916                  * within one reporting interval.
 917                  *
 918                  * Case (b) happens if initially two or more fingers tap
 919                  * briefly, and all but one lift before the end of the first
 920                  * reporting interval.
 921                  *
 922                  * (In both these cases, slot 0 will becomes empty, so SGM
 923                  * contains slot 1 with the new finger)
 924                  *
 925                  * Else, if there was no previous SGM, it now contains slot 0.
 926                  *
 927                  * Otherwise, SGM still contains the same slot.
 928                  */
 929                 if (priv->mt_state_lost ||
 930                     (priv->agm_pending && old->sgm <= 0))
 931                         synaptics_mt_state_set(mt_state, 1, 1, -1);
 932                 else if (old->sgm == -1)
 933                         synaptics_mt_state_set(mt_state, 1, 0, -1);
 934                 break;
 935         case 2:
 936                 /*
 937                  * If mt_state_lost, we don't know which finger SGM contains.
 938                  *
 939                  * So, report 1 finger, but with both slots empty.
 940                  * We will use slot 1 on subsequent 1->1
 941                  */
 942                 if (priv->mt_state_lost) {
 943                         synaptics_mt_state_set(mt_state, 1, -1, -1);
 944                         break;
 945                 }
 946                 /*
 947                  * Since the last AGM was NOT (0,0,0), it was the finger in
 948                  * slot 0 that has been removed.
 949                  * So, SGM now contains previous AGM's slot, and AGM is now
 950                  * empty.
 951                  */
 952                 synaptics_mt_state_set(mt_state, 1, old->agm, -1);
 953                 break;
 954         case 3:
 955                 /*
 956                  * Since last AGM was not (0,0,0), we don't know which finger
 957                  * is left.
 958                  *
 959                  * So, report 1 finger, but with both slots empty.
 960                  * We will use slot 1 on subsequent 1->1
 961                  */
 962                 synaptics_mt_state_set(mt_state, 1, -1, -1);
 963                 priv->mt_state_lost = true;
 964                 break;
 965         case 4:
 966         case 5:
 967                 /* mt_state was updated by AGM-CONTACT packet */
 968                 break;
 969         }
 970 }
 971
 972 /* Handle case where mt_state->count = 2 */
 973 static void synaptics_image_sensor_2f(struct synaptics_data *priv,
 974                                       struct synaptics_mt_state *mt_state)
 975 {
 976         struct synaptics_mt_state *old = &priv->mt_state;
 977
 978         switch (old->count) {
 979         case 0:
 980                 synaptics_mt_state_set(mt_state, 2, 0, 1);
 981                 break;
 982         case 1:
 983                 /*
 984                  * If previous SGM contained slot 1 or higher, SGM now contains
 985                  * slot 0 (the newly touching finger) and AGM contains SGM's
 986                  * previous slot.
 987                  *
 988                  * Otherwise, SGM still contains slot 0 and AGM now contains
 989                  * slot 1.
 990                  */
 991                 if (old->sgm >= 1)
 992                         synaptics_mt_state_set(mt_state, 2, 0, old->sgm);
 993                 else
 994                         synaptics_mt_state_set(mt_state, 2, 0, 1);
 995                 break;
 996         case 2:
 997                 /*
 998                  * If mt_state_lost, SGM now contains either finger 1 or 2, but
 999                  * we don't know which.
1000                  * So, we just assume that the SGM contains slot 0 and AGM 1.
1001                  */
1002                 if (priv->mt_state_lost)
1003                         synaptics_mt_state_set(mt_state, 2, 0, 1);
1004                 /*
1005                  * Otherwise, use the same mt_state, since it either hasn't
1006                  * changed, or was updated by a recently received AGM-CONTACT
1007                  * packet.
1008                  */
1009                 break;
1010         case 3:
1011                 /*
1012                  * 3->2 transitions have two unsolvable problems:
1013                  *  1) no indication is given which finger was removed
1014                  *  2) no way to tell if agm packet was for finger 3
1015                  *     before 3->2, or finger 2 after 3->2.
1016                  *
1017                  * So, report 2 fingers, but empty all slots.
1018                  * We will guess slots [0,1] on subsequent 2->2.
1019                  */
1020                 synaptics_mt_state_set(mt_state, 2, -1, -1);
1021                 priv->mt_state_lost = true;
1022                 break;
1023         case 4:
1024         case 5:
1025                 /* mt_state was updated by AGM-CONTACT packet */
1026                 break;
1027         }
1028 }
1029
1030 /* Handle case where mt_state->count = 3 */
1031 static void synaptics_image_sensor_3f(struct synaptics_data *priv,
1032                                       struct synaptics_mt_state *mt_state)
1033 {
1034         struct synaptics_mt_state *old = &priv->mt_state;
1035
1036         switch (old->count) {
1037         case 0:
1038                 synaptics_mt_state_set(mt_state, 3, 0, 2);
1039                 break;
1040         case 1:
1041                 /*
1042                  * If previous SGM contained slot 2 or higher, SGM now contains
1043                  * slot 0 (one of the newly touching fingers) and AGM contains
1044                  * SGM's previous slot.
1045                  *
1046                  * Otherwise, SGM now contains slot 0 and AGM contains slot 2.
1047                  */
1048                 if (old->sgm >= 2)
1049                         synaptics_mt_state_set(mt_state, 3, 0, old->sgm);
1050                 else
1051                         synaptics_mt_state_set(mt_state, 3, 0, 2);
1052                 break;
1053         case 2:
1054                 /*
1055                  * If the AGM previously contained slot 3 or higher, then the
1056                  * newly touching finger is in the lowest available slot.
1057                  *
1058                  * If SGM was previously 1 or higher, then the new SGM is
1059                  * now slot 0 (with a new finger), otherwise, the new finger
1060                  * is now in a hidden slot between 0 and AGM's slot.
1061                  *
1062                  * In all such cases, the SGM now contains slot 0, and the AGM
1063                  * continues to contain the same slot as before.
1064                  */
1065                 if (old->agm >= 3) {
1066                         synaptics_mt_state_set(mt_state, 3, 0, old->agm);
1067                         break;
1068                 }
1069
1070                 /*
1071                  * After some 3->1 and all 3->2 transitions, we lose track
1072                  * of which slot is reported by SGM and AGM.
1073                  *
1074                  * For 2->3 in this state, report 3 fingers, but empty all
1075                  * slots, and we will guess (0,2) on a subsequent 0->3.
1076                  *
1077                  * To userspace, the resulting transition will look like:
1078                  *    2:[0,1] -> 3:[-1,-1] -> 3:[0,2]
1079                  */
1080                 if (priv->mt_state_lost) {
1081                         synaptics_mt_state_set(mt_state, 3, -1, -1);
1082                         break;
1083                 }
1084
1085                 /*
1086                  * If the (SGM,AGM) really previously contained slots (0, 1),
1087                  * then we cannot know what slot was just reported by the AGM,
1088                  * because the 2->3 transition can occur either before or after
1089                  * the AGM packet. Thus, this most recent AGM could contain
1090                  * either the same old slot 1 or the new slot 2.
1091                  * Subsequent AGMs will be reporting slot 2.
1092                  *
1093                  * To userspace, the resulting transition will look like:
1094                  *    2:[0,1] -> 3:[0,-1] -> 3:[0,2]
1095                  */
1096                 synaptics_mt_state_set(mt_state, 3, 0, -1);
1097                 break;
1098         case 3:
1099                 /*
1100                  * If, for whatever reason, the previous agm was invalid,
1101                  * Assume SGM now contains slot 0, AGM now contains slot 2.
1102                  */
1103                 if (old->agm <= 2)
1104                         synaptics_mt_state_set(mt_state, 3, 0, 2);
1105                 /*
1106                  * mt_state either hasn't changed, or was updated by a recently
1107                  * received AGM-CONTACT packet.
1108                  */
1109                 break;
1110
1111         case 4:
1112         case 5:
1113                 /* mt_state was updated by AGM-CONTACT packet */
1114                 break;
1115         }
1116 }
1117
1118 /* Handle case where mt_state->count = 4, or = 5 */
1119 static void synaptics_image_sensor_45f(struct synaptics_data *priv,
1120                                        struct synaptics_mt_state *mt_state)
1121 {
1122         /* mt_state was updated correctly by AGM-CONTACT packet */
1123         priv->mt_state_lost = false;
1124 }
1125
1126 static void synaptics_image_sensor_process(struct psmouse *psmouse,
1127                                            struct synaptics_hw_state *sgm)
1128 {
1129         struct synaptics_data *priv = psmouse->private;
1130         struct synaptics_hw_state *agm = &priv->agm;
1131         struct synaptics_mt_state mt_state;
1132
1133         /* Initialize using current mt_state (as updated by last agm) */
1134         mt_state = agm->mt_state;
1135
1136         /*
1137          * Update mt_state using the new finger count and current mt_state.
1138          */
1139         if (sgm->z == 0)
1140                 synaptics_image_sensor_0f(priv, &mt_state);
1141         else if (sgm->w >= 4)
1142                 synaptics_image_sensor_1f(priv, &mt_state);
1143         else if (sgm->w == 0)
1144                 synaptics_image_sensor_2f(priv, &mt_state);
1145         else if (sgm->w == 1 && mt_state.count <= 3)
1146                 synaptics_image_sensor_3f(priv, &mt_state);
1147         else
1148                 synaptics_image_sensor_45f(priv, &mt_state);
1149
1150         /* Send resulting input events to user space */
1151         synaptics_report_mt_data(psmouse, &mt_state, sgm);
1152
1153         /* Store updated mt_state */
1154         priv->mt_state = agm->mt_state = mt_state;
1155         priv->agm_pending = false;
1156 }
1157
1158 static void synaptics_profile_sensor_process(struct psmouse *psmouse,
1159                                              struct synaptics_hw_state *sgm,
1160                                              int num_fingers)
1161 {
1162         struct input_dev *dev = psmouse->dev;
1163         struct synaptics_data *priv = psmouse->private;
1164         struct synaptics_hw_state *hw[2] = { sgm, &priv->agm };
1165         struct input_mt_pos pos[2];
1166         int slot[2], nsemi, i;
1167
1168         nsemi = clamp_val(num_fingers, 0, 2);
1169
1170         for (i = 0; i < nsemi; i++) {
1171                 pos[i].x = hw[i]->x;
1172                 pos[i].y = synaptics_invert_y(hw[i]->y);
1173         }
1174
1175         input_mt_assign_slots(dev, slot, pos, nsemi);
1176
1177         for (i = 0; i < nsemi; i++) {
1178                 input_mt_slot(dev, slot[i]);
1179                 input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
1180                 input_report_abs(dev, ABS_MT_POSITION_X, pos[i].x);
1181                 input_report_abs(dev, ABS_MT_POSITION_Y, pos[i].y);
1182                 input_report_abs(dev, ABS_MT_PRESSURE, hw[i]->z);
1183         }
1184
1185         input_mt_drop_unused(dev);
1186         input_mt_report_pointer_emulation(dev, false);
1187         input_mt_report_finger_count(dev, num_fingers);
1188
1189         synaptics_report_buttons(psmouse, sgm);
1190
1191         input_sync(dev);
1192 }
1193
1194 /*
1195  *  called for each full received packet from the touchpad
1196  */
1197 static void synaptics_process_packet(struct psmouse *psmouse)
1198 {
1199         struct input_dev *dev = psmouse->dev;
1200         struct synaptics_data *priv = psmouse->private;
1201         struct synaptics_hw_state hw;
1202         int num_fingers;
1203         int finger_width;
1204
1205         if (synaptics_parse_hw_state(psmouse->packet, priv, &hw))
1206                 return;
1207
1208         if (SYN_CAP_IMAGE_SENSOR(priv->ext_cap_0c)) {
1209                 synaptics_image_sensor_process(psmouse, &hw);
1210                 return;
1211         }
1212
1213         if (hw.scroll) {
1214                 priv->scroll += hw.scroll;
1215
1216                 while (priv->scroll >= 4) {
1217                         input_report_key(dev, BTN_BACK, !hw.down);
1218                         input_sync(dev);
1219                         input_report_key(dev, BTN_BACK, hw.down);
1220                         input_sync(dev);
1221                         priv->scroll -= 4;
1222                 }
1223                 while (priv->scroll <= -4) {
1224                         input_report_key(dev, BTN_FORWARD, !hw.up);
1225                         input_sync(dev);
1226                         input_report_key(dev, BTN_FORWARD, hw.up);
1227                         input_sync(dev);
1228                         priv->scroll += 4;
1229                 }
1230                 return;
1231         }
1232
1233         if (hw.z > 0 && hw.x > 1) {
1234                 num_fingers = 1;
1235                 finger_width = 5;
1236                 if (SYN_CAP_EXTENDED(priv->capabilities)) {
1237                         switch (hw.w) {
1238                         case 0 ... 1:
1239                                 if (SYN_CAP_MULTIFINGER(priv->capabilities))
1240                                         num_fingers = hw.w + 2;
1241                                 break;
1242                         case 2:
1243                                 if (SYN_MODEL_PEN(priv->model_id))
1244                                         ;   /* Nothing, treat a pen as a single finger */
1245                                 break;
1246                         case 4 ... 15:
1247                                 if (SYN_CAP_PALMDETECT(priv->capabilities))
1248                                         finger_width = hw.w;
1249                                 break;
1250                         }
1251                 }
1252         } else {
1253                 num_fingers = 0;
1254                 finger_width = 0;
1255         }
1256
1257         if (cr48_profile_sensor) {
1258                 synaptics_profile_sensor_process(psmouse, &hw, num_fingers);
1259                 return;
1260         }
1261
1262         if (SYN_CAP_ADV_GESTURE(priv->ext_cap_0c))
1263                 synaptics_report_semi_mt_data(dev, &hw, &priv->agm,
1264                                               num_fingers);
1265
1266         /* Post events
1267          * BTN_TOUCH has to be first as mousedev relies on it when doing
1268          * absolute -> relative conversion
1269          */
1270         if (hw.z > 30) input_report_key(dev, BTN_TOUCH, 1);
1271         if (hw.z < 25) input_report_key(dev, BTN_TOUCH, 0);
1272
1273         if (num_fingers > 0) {
1274                 input_report_abs(dev, ABS_X, hw.x);
1275                 input_report_abs(dev, ABS_Y, synaptics_invert_y(hw.y));
1276         }
1277         input_report_abs(dev, ABS_PRESSURE, hw.z);
1278
1279         if (SYN_CAP_PALMDETECT(priv->capabilities))
1280                 input_report_abs(dev, ABS_TOOL_WIDTH, finger_width);
1281
1282         input_report_key(dev, BTN_TOOL_FINGER, num_fingers == 1);
1283         if (SYN_CAP_MULTIFINGER(priv->capabilities)) {
1284                 input_report_key(dev, BTN_TOOL_DOUBLETAP, num_fingers == 2);
1285                 input_report_key(dev, BTN_TOOL_TRIPLETAP, num_fingers == 3);
1286         }
1287
1288         synaptics_report_buttons(psmouse, &hw);
1289
1290         input_sync(dev);
1291 }
1292
1293 static int synaptics_validate_byte(struct psmouse *psmouse,
1294                                    int idx, unsigned char pkt_type)
1295 {
1296         static const unsigned char newabs_mask[]        = { 0xC8, 0x00, 0x00, 0xC8, 0x00 };
1297         static const unsigned char newabs_rel_mask[]    = { 0xC0, 0x00, 0x00, 0xC0, 0x00 };
1298         static const unsigned char newabs_rslt[]        = { 0x80, 0x00, 0x00, 0xC0, 0x00 };
1299         static const unsigned char oldabs_mask[]        = { 0xC0, 0x60, 0x00, 0xC0, 0x60 };
1300         static const unsigned char oldabs_rslt[]        = { 0xC0, 0x00, 0x00, 0x80, 0x00 };
1301         const char *packet = psmouse->packet;
1302
1303         if (idx < 0 || idx > 4)
1304                 return 0;
1305
1306         switch (pkt_type) {
1307
1308         case SYN_NEWABS:
1309         case SYN_NEWABS_RELAXED:
1310                 return (packet[idx] & newabs_rel_mask[idx]) == newabs_rslt[idx];
1311
1312         case SYN_NEWABS_STRICT:
1313                 return (packet[idx] & newabs_mask[idx]) == newabs_rslt[idx];
1314
1315         case SYN_OLDABS:
1316                 return (packet[idx] & oldabs_mask[idx]) == oldabs_rslt[idx];
1317
1318         default:
1319                 psmouse_err(psmouse, "unknown packet type %d\n", pkt_type);
1320                 return 0;
1321         }
1322 }
1323
1324 static unsigned char synaptics_detect_pkt_type(struct psmouse *psmouse)
1325 {
1326         int i;
1327
1328         for (i = 0; i < 5; i++)
1329                 if (!synaptics_validate_byte(psmouse, i, SYN_NEWABS_STRICT)) {
1330                         psmouse_info(psmouse, "using relaxed packet validation\n");
1331                         return SYN_NEWABS_RELAXED;
1332                 }
1333
1334         return SYN_NEWABS_STRICT;
1335 }
1336
1337 static psmouse_ret_t synaptics_process_byte(struct psmouse *psmouse)
1338 {
1339         struct synaptics_data *priv = psmouse->private;
1340
1341         if (psmouse->pktcnt >= 6) { /* Full packet received */
1342                 if (unlikely(priv->pkt_type == SYN_NEWABS))
1343                         priv->pkt_type = synaptics_detect_pkt_type(psmouse);
1344
1345                 if (SYN_CAP_PASS_THROUGH(priv->capabilities) &&
1346                     synaptics_is_pt_packet(psmouse->packet)) {
1347                         if (priv->pt_port)
1348                                 synaptics_pass_pt_packet(priv->pt_port, psmouse->packet);
1349                 } else
1350                         synaptics_process_packet(psmouse);
1351
1352                 return PSMOUSE_FULL_PACKET;
1353         }
1354
1355         return synaptics_validate_byte(psmouse, psmouse->pktcnt - 1, priv->pkt_type) ?
1356                 PSMOUSE_GOOD_DATA : PSMOUSE_BAD_DATA;
1357 }
1358
1359 /*****************************************************************************
1360  *      Driver initialization/cleanup functions
1361  ****************************************************************************/
1362 static void set_abs_position_params(struct input_dev *dev,
1363                                     struct synaptics_data *priv, int x_code,
1364                                     int y_code)
1365 {
1366         int x_min = priv->x_min ?: XMIN_NOMINAL;
1367         int x_max = priv->x_max ?: XMAX_NOMINAL;
1368         int y_min = priv->y_min ?: YMIN_NOMINAL;
1369         int y_max = priv->y_max ?: YMAX_NOMINAL;
1370         int fuzz = SYN_CAP_REDUCED_FILTERING(priv->ext_cap_0c) ?
1371                         SYN_REDUCED_FILTER_FUZZ : 0;
1372
1373         input_set_abs_params(dev, x_code, x_min, x_max, fuzz, 0);
1374         input_set_abs_params(dev, y_code, y_min, y_max, fuzz, 0);
1375         input_abs_set_res(dev, x_code, priv->x_res);
1376         input_abs_set_res(dev, y_code, priv->y_res);
1377 }
1378
1379 static void set_input_params(struct psmouse *psmouse,
1380                              struct synaptics_data *priv)
1381 {
1382         struct input_dev *dev = psmouse->dev;
1383         int i;
1384
1385         /* Things that apply to both modes */
1386         __set_bit(INPUT_PROP_POINTER, dev->propbit);
1387         __set_bit(EV_KEY, dev->evbit);
1388         __set_bit(BTN_LEFT, dev->keybit);
1389         __set_bit(BTN_RIGHT, dev->keybit);
1390
1391         if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities))
1392                 __set_bit(BTN_MIDDLE, dev->keybit);
1393
1394         if (!priv->absolute_mode) {
1395                 /* Relative mode */
1396                 __set_bit(EV_REL, dev->evbit);
1397                 __set_bit(REL_X, dev->relbit);
1398                 __set_bit(REL_Y, dev->relbit);
1399                 return;
1400         }
1401
1402         /* Absolute mode */
1403         __set_bit(EV_ABS, dev->evbit);
1404         set_abs_position_params(dev, priv, ABS_X, ABS_Y);
1405         input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
1406
1407         if (cr48_profile_sensor)
1408                 input_set_abs_params(dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
1409
1410         if (SYN_CAP_IMAGE_SENSOR(priv->ext_cap_0c)) {
1411                 set_abs_position_params(dev, priv, ABS_MT_POSITION_X,
1412                                         ABS_MT_POSITION_Y);
1413                 /* Image sensors can report per-contact pressure */
1414                 input_set_abs_params(dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
1415                 input_mt_init_slots(dev, 2, INPUT_MT_POINTER);
1416
1417                 /* Image sensors can signal 4 and 5 finger clicks */
1418                 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
1419                 __set_bit(BTN_TOOL_QUINTTAP, dev->keybit);
1420         } else if (SYN_CAP_ADV_GESTURE(priv->ext_cap_0c)) {
1421                 set_abs_position_params(dev, priv, ABS_MT_POSITION_X,
1422                                         ABS_MT_POSITION_Y);
1423                 /*
1424                  * Profile sensor in CR-48 tracks contacts reasonably well,
1425                  * other non-image sensors with AGM use semi-mt.
1426                  */
1427                 input_mt_init_slots(dev, 2,
1428                                     INPUT_MT_POINTER |
1429                                     (cr48_profile_sensor ?
1430                                         INPUT_MT_TRACK : INPUT_MT_SEMI_MT));
1431         }
1432
1433         if (SYN_CAP_PALMDETECT(priv->capabilities))
1434                 input_set_abs_params(dev, ABS_TOOL_WIDTH, 0, 15, 0, 0);
1435
1436         __set_bit(BTN_TOUCH, dev->keybit);
1437         __set_bit(BTN_TOOL_FINGER, dev->keybit);
1438
1439         if (SYN_CAP_MULTIFINGER(priv->capabilities)) {
1440                 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
1441                 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
1442         }
1443
1444         if (SYN_CAP_FOUR_BUTTON(priv->capabilities) ||
1445             SYN_CAP_MIDDLE_BUTTON(priv->capabilities)) {
1446                 __set_bit(BTN_FORWARD, dev->keybit);
1447                 __set_bit(BTN_BACK, dev->keybit);
1448         }
1449
1450         for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap); i++)
1451                 __set_bit(BTN_0 + i, dev->keybit);
1452
1453         __clear_bit(EV_REL, dev->evbit);
1454         __clear_bit(REL_X, dev->relbit);
1455         __clear_bit(REL_Y, dev->relbit);
1456
1457         if (SYN_CAP_CLICKPAD(priv->ext_cap_0c)) {
1458                 __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
1459                 if (matches_pnp_id(psmouse, topbuttonpad_pnp_ids))
1460                         __set_bit(INPUT_PROP_TOPBUTTONPAD, dev->propbit);
1461                 /* Clickpads report only left button */
1462                 __clear_bit(BTN_RIGHT, dev->keybit);
1463                 __clear_bit(BTN_MIDDLE, dev->keybit);
1464         }
1465 }
1466
1467 static ssize_t synaptics_show_disable_gesture(struct psmouse *psmouse,
1468                                               void *data, char *buf)
1469 {
1470         struct synaptics_data *priv = psmouse->private;
1471
1472         return sprintf(buf, "%c\n", priv->disable_gesture ? '1' : '0');
1473 }
1474
1475 static ssize_t synaptics_set_disable_gesture(struct psmouse *psmouse,
1476                                              void *data, const char *buf,
1477                                              size_t len)
1478 {
1479         struct synaptics_data *priv = psmouse->private;
1480         unsigned int value;
1481         int err;
1482
1483         err = kstrtouint(buf, 10, &value);
1484         if (err)
1485                 return err;
1486
1487         if (value > 1)
1488                 return -EINVAL;
1489
1490         if (value == priv->disable_gesture)
1491                 return len;
1492
1493         priv->disable_gesture = value;
1494         if (value)
1495                 priv->mode |= SYN_BIT_DISABLE_GESTURE;
1496         else
1497                 priv->mode &= ~SYN_BIT_DISABLE_GESTURE;
1498
1499         if (synaptics_mode_cmd(psmouse, priv->mode))
1500                 return -EIO;
1501
1502         return len;
1503 }
1504
1505 PSMOUSE_DEFINE_ATTR(disable_gesture, S_IWUSR | S_IRUGO, NULL,
1506                     synaptics_show_disable_gesture,
1507                     synaptics_set_disable_gesture);
1508
1509 static void synaptics_disconnect(struct psmouse *psmouse)
1510 {
1511         struct synaptics_data *priv = psmouse->private;
1512
1513         if (!priv->absolute_mode && SYN_ID_DISGEST_SUPPORTED(priv->identity))
1514                 device_remove_file(&psmouse->ps2dev.serio->dev,
1515                                    &psmouse_attr_disable_gesture.dattr);
1516
1517         synaptics_reset(psmouse);
1518         kfree(priv);
1519         psmouse->private = NULL;
1520 }
1521
1522 static int synaptics_reconnect(struct psmouse *psmouse)
1523 {
1524         struct synaptics_data *priv = psmouse->private;
1525         struct synaptics_data old_priv = *priv;
1526         unsigned char param[2];
1527         int retry = 0;
1528         int error;
1529
1530         do {
1531                 psmouse_reset(psmouse);
1532                 if (retry) {
1533                         /*
1534                          * On some boxes, right after resuming, the touchpad
1535                          * needs some time to finish initializing (I assume
1536                          * it needs time to calibrate) and start responding
1537                          * to Synaptics-specific queries, so let's wait a
1538                          * bit.
1539                          */
1540                         ssleep(1);
1541                 }
1542                 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETID);
1543                 error = synaptics_detect(psmouse, 0);
1544         } while (error && ++retry < 3);
1545
1546         if (error)
1547                 return -1;
1548
1549         if (retry > 1)
1550                 psmouse_dbg(psmouse, "reconnected after %d tries\n", retry);
1551
1552         if (synaptics_query_hardware(psmouse)) {
1553                 psmouse_err(psmouse, "Unable to query device.\n");
1554                 return -1;
1555         }
1556
1557         if (synaptics_set_mode(psmouse)) {
1558                 psmouse_err(psmouse, "Unable to initialize device.\n");
1559                 return -1;
1560         }
1561
1562         if (old_priv.identity != priv->identity ||
1563             old_priv.model_id != priv->model_id ||
1564             old_priv.capabilities != priv->capabilities ||
1565             old_priv.ext_cap != priv->ext_cap) {
1566                 psmouse_err(psmouse,
1567                             "hardware appears to be different: id(%ld-%ld), model(%ld-%ld), caps(%lx-%lx), ext(%lx-%lx).\n",
1568                             old_priv.identity, priv->identity,
1569                             old_priv.model_id, priv->model_id,
1570                             old_priv.capabilities, priv->capabilities,
1571                             old_priv.ext_cap, priv->ext_cap);
1572                 return -1;
1573         }
1574
1575         return 0;
1576 }
1577
1578 static bool impaired_toshiba_kbc;
1579
1580 static const struct dmi_system_id toshiba_dmi_table[] __initconst = {
1581 #if defined(CONFIG_DMI) && defined(CONFIG_X86)
1582         {
1583                 /* Toshiba Satellite */
1584                 .matches = {
1585                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1586                         DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
1587                 },
1588         },
1589         {
1590                 /* Toshiba Dynabook */
1591                 .matches = {
1592                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1593                         DMI_MATCH(DMI_PRODUCT_NAME, "dynabook"),
1594                 },
1595         },
1596         {
1597                 /* Toshiba Portege M300 */
1598                 .matches = {
1599                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1600                         DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE M300"),
1601                 },
1602
1603         },
1604         {
1605                 /* Toshiba Portege M300 */
1606                 .matches = {
1607                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1608                         DMI_MATCH(DMI_PRODUCT_NAME, "Portable PC"),
1609                         DMI_MATCH(DMI_PRODUCT_VERSION, "Version 1.0"),
1610                 },
1611
1612         },
1613 #endif
1614         { }
1615 };
1616
1617 static bool broken_olpc_ec;
1618
1619 static const struct dmi_system_id olpc_dmi_table[] __initconst = {
1620 #if defined(CONFIG_DMI) && defined(CONFIG_OLPC)
1621         {
1622                 /* OLPC XO-1 or XO-1.5 */
1623                 .matches = {
1624                         DMI_MATCH(DMI_SYS_VENDOR, "OLPC"),
1625                         DMI_MATCH(DMI_PRODUCT_NAME, "XO"),
1626                 },
1627         },
1628 #endif
1629         { }
1630 };
1631
1632 static const struct dmi_system_id __initconst cr48_dmi_table[] = {
1633 #if defined(CONFIG_DMI) && defined(CONFIG_X86)
1634         {
1635                 /* Cr-48 Chromebook (Codename Mario) */
1636                 .matches = {
1637                         DMI_MATCH(DMI_SYS_VENDOR, "IEC"),
1638                         DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
1639                 },
1640         },
1641 #endif
1642         { }
1643 };
1644
1645 void __init synaptics_module_init(void)
1646 {
1647         impaired_toshiba_kbc = dmi_check_system(toshiba_dmi_table);
1648         broken_olpc_ec = dmi_check_system(olpc_dmi_table);
1649         cr48_profile_sensor = dmi_check_system(cr48_dmi_table);
1650 }
1651
1652 static int __synaptics_init(struct psmouse *psmouse, bool absolute_mode)
1653 {
1654         struct synaptics_data *priv;
1655         int err = -1;
1656
1657         /*
1658          * The OLPC XO has issues with Synaptics' absolute mode; the constant
1659          * packet spew overloads the EC such that key presses on the keyboard
1660          * are missed.  Given that, don't even attempt to use Absolute mode.
1661          * Relative mode seems to work just fine.
1662          */
1663         if (absolute_mode && broken_olpc_ec) {
1664                 psmouse_info(psmouse,
1665                              "OLPC XO detected, not enabling Synaptics protocol.\n");
1666                 return -ENODEV;
1667         }
1668
1669         psmouse->private = priv = kzalloc(sizeof(struct synaptics_data), GFP_KERNEL);
1670         if (!priv)
1671                 return -ENOMEM;
1672
1673         psmouse_reset(psmouse);
1674
1675         if (synaptics_query_hardware(psmouse)) {
1676                 psmouse_err(psmouse, "Unable to query device.\n");
1677                 goto init_fail;
1678         }
1679
1680         priv->absolute_mode = absolute_mode;
1681         if (SYN_ID_DISGEST_SUPPORTED(priv->identity))
1682                 priv->disable_gesture = true;
1683
1684         if (synaptics_set_mode(psmouse)) {
1685                 psmouse_err(psmouse, "Unable to initialize device.\n");
1686                 goto init_fail;
1687         }
1688
1689         priv->pkt_type = SYN_MODEL_NEWABS(priv->model_id) ? SYN_NEWABS : SYN_OLDABS;
1690
1691         psmouse_info(psmouse,
1692                      "Touchpad model: %ld, fw: %ld.%ld, id: %#lx, caps: %#lx/%#lx/%#lx, board id: %lu, fw id: %lu\n",
1693                      SYN_ID_MODEL(priv->identity),
1694                      SYN_ID_MAJOR(priv->identity), SYN_ID_MINOR(priv->identity),
1695                      priv->model_id,
1696                      priv->capabilities, priv->ext_cap, priv->ext_cap_0c,
1697                      priv->board_id, priv->firmware_id);
1698
1699         set_input_params(psmouse, priv);
1700
1701         /*
1702          * Encode touchpad model so that it can be used to set
1703          * input device->id.version and be visible to userspace.
1704          * Because version is __u16 we have to drop something.
1705          * Hardware info bits seem to be good candidates as they
1706          * are documented to be for Synaptics corp. internal use.
1707          */
1708         psmouse->model = ((priv->model_id & 0x00ff0000) >> 8) |
1709                           (priv->model_id & 0x000000ff);
1710
1711         if (absolute_mode) {
1712                 psmouse->protocol_handler = synaptics_process_byte;
1713                 psmouse->pktsize = 6;
1714         } else {
1715                 /* Relative mode follows standard PS/2 mouse protocol */
1716                 psmouse->protocol_handler = psmouse_process_byte;
1717                 psmouse->pktsize = 3;
1718         }
1719
1720         psmouse->set_rate = synaptics_set_rate;
1721         psmouse->disconnect = synaptics_disconnect;
1722         psmouse->reconnect = synaptics_reconnect;
1723         psmouse->cleanup = synaptics_reset;
1724         /* Synaptics can usually stay in sync without extra help */
1725         psmouse->resync_time = 0;
1726
1727         if (SYN_CAP_PASS_THROUGH(priv->capabilities))
1728                 synaptics_pt_create(psmouse);
1729
1730         /*
1731          * Toshiba's KBC seems to have trouble handling data from
1732          * Synaptics at full rate.  Switch to a lower rate (roughly
1733          * the same rate as a standard PS/2 mouse).
1734          */
1735         if (psmouse->rate >= 80 && impaired_toshiba_kbc) {
1736                 psmouse_info(psmouse,
1737                              "Toshiba %s detected, limiting rate to 40pps.\n",
1738                              dmi_get_system_info(DMI_PRODUCT_NAME));
1739                 psmouse->rate = 40;
1740         }
1741
1742         if (!priv->absolute_mode && SYN_ID_DISGEST_SUPPORTED(priv->identity)) {
1743                 err = device_create_file(&psmouse->ps2dev.serio->dev,
1744                                          &psmouse_attr_disable_gesture.dattr);
1745                 if (err) {
1746                         psmouse_err(psmouse,
1747                                     "Failed to create disable_gesture attribute (%d)",
1748                                     err);
1749                         goto init_fail;
1750                 }
1751         }
1752
1753         return 0;
1754
1755  init_fail:
1756         kfree(priv);
1757         return err;
1758 }
1759
1760 int synaptics_init(struct psmouse *psmouse)
1761 {
1762         return __synaptics_init(psmouse, true);
1763 }
1764
1765 int synaptics_init_relative(struct psmouse *psmouse)
1766 {
1767         return __synaptics_init(psmouse, false);
1768 }
1769
1770 bool synaptics_supported(void)
1771 {
1772         return true;
1773 }
1774
1775 #else /* CONFIG_MOUSE_PS2_SYNAPTICS */
1776
1777 void __init synaptics_module_init(void)
1778 {
1779 }
1780
1781 int synaptics_init(struct psmouse *psmouse)
1782 {
1783         return -ENOSYS;
1784 }
1785
1786 bool synaptics_supported(void)
1787 {
1788         return false;
1789 }
1790
1791 #endif /* CONFIG_MOUSE_PS2_SYNAPTICS */