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