linux/drivers/input/mouse/synaptics.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Synaptics TouchPad PS/2 mouse driver
   4 *
   5 *   2003 Dmitry Torokhov <dtor@mail.ru>
   6 *     Added support for pass-through port. Special thanks to Peter Berg Larsen
   7 *     for explaining various Synaptics quirks.
   8 *
   9 *   2003 Peter Osterlund <petero2@telia.com>
  10 *     Ported to 2.5 input device infrastructure.
  11 *
  12 *   Copyright (C) 2001 Stefan Gmeiner <riddlebox@freesurf.ch>
  13 *     start merging tpconfig and gpm code to a xfree-input module
  14 *     adding some changes and extensions (ex. 3rd and 4th button)
  15 *
  16 *   Copyright (c) 1997 C. Scott Ananian <cananian@alumni.priceton.edu>
  17 *   Copyright (c) 1998-2000 Bruce Kalk <kall@compass.com>
  18 *     code for the special synaptics commands (from the tpconfig-source)
  19 *
  20 * Trademarks are the property of their respective owners.
  21 */
  22
  23#include <linux/module.h>
  24#include <linux/delay.h>
  25#include <linux/dmi.h>
  26#include <linux/input/mt.h>
  27#include <linux/serio.h>
  28#include <linux/libps2.h>
  29#include <linux/rmi.h>
  30#include <linux/i2c.h>
  31#include <linux/slab.h>
  32#include "psmouse.h"
  33#include "synaptics.h"
  34
  35/*
  36 * The x/y limits are taken from the Synaptics TouchPad interfacing Guide,
  37 * section 2.3.2, which says that they should be valid regardless of the
  38 * actual size of the sensor.
  39 * Note that newer firmware allows querying device for maximum useable
  40 * coordinates.
  41 */
  42#define XMIN 0
  43#define XMAX 6143
  44#define YMIN 0
  45#define YMAX 6143
  46#define XMIN_NOMINAL 1472
  47#define XMAX_NOMINAL 5472
  48#define YMIN_NOMINAL 1408
  49#define YMAX_NOMINAL 4448
  50
  51/* Size in bits of absolute position values reported by the hardware */
  52#define ABS_POS_BITS 13
  53
  54/*
  55 * These values should represent the absolute maximum value that will
  56 * be reported for a positive position value. Some Synaptics firmware
  57 * uses this value to indicate a finger near the edge of the touchpad
  58 * whose precise position cannot be determined.
  59 *
  60 * At least one touchpad is known to report positions in excess of this
  61 * value which are actually negative values truncated to the 13-bit
  62 * reporting range. These values have never been observed to be lower
  63 * than 8184 (i.e. -8), so we treat all values greater than 8176 as
  64 * negative and any other value as positive.
  65 */
  66#define X_MAX_POSITIVE 8176
  67#define Y_MAX_POSITIVE 8176
  68
  69/* maximum ABS_MT_POSITION displacement (in mm) */
  70#define DMAX 10
  71
  72/*****************************************************************************
  73 *      Stuff we need even when we do not want native Synaptics support
  74 ****************************************************************************/
  75
  76/*
  77 * Set the synaptics touchpad mode byte by special commands
  78 */
  79static int synaptics_mode_cmd(struct psmouse *psmouse, u8 mode)
  80{
  81        u8 param[1];
  82        int error;
  83
  84        error = ps2_sliced_command(&psmouse->ps2dev, mode);
  85        if (error)
  86                return error;
  87
  88        param[0] = SYN_PS_SET_MODE2;
  89        error = ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_SETRATE);
  90        if (error)
  91                return error;
  92
  93        return 0;
  94}
  95
  96int synaptics_detect(struct psmouse *psmouse, bool set_properties)
  97{
  98        struct ps2dev *ps2dev = &psmouse->ps2dev;
  99        u8 param[4] = { 0 };
 100
 101        ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 102        ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 103        ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 104        ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 105        ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
 106
 107        if (param[1] != 0x47)
 108                return -ENODEV;
 109
 110        if (set_properties) {
 111                psmouse->vendor = "Synaptics";
 112                psmouse->name = "TouchPad";
 113        }
 114
 115        return 0;
 116}
 117
 118void synaptics_reset(struct psmouse *psmouse)
 119{
 120        /* reset touchpad back to relative mode, gestures enabled */
 121        synaptics_mode_cmd(psmouse, 0);
 122}
 123
 124#if defined(CONFIG_MOUSE_PS2_SYNAPTICS) || \
 125    defined(CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS)
 126
 127/* This list has been kindly provided by Synaptics. */
 128static const char * const topbuttonpad_pnp_ids[] = {
 129        "LEN0017",
 130        "LEN0018",
 131        "LEN0019",
 132        "LEN0023",
 133        "LEN002A",
 134        "LEN002B",
 135        "LEN002C",
 136        "LEN002D",
 137        "LEN002E",
 138        "LEN0033", /* Helix */
 139        "LEN0034", /* T431s, L440, L540, T540, W540, X1 Carbon 2nd */
 140        "LEN0035", /* X240 */
 141        "LEN0036", /* T440 */
 142        "LEN0037", /* X1 Carbon 2nd */
 143        "LEN0038",
 144        "LEN0039", /* T440s */
 145        "LEN0041",
 146        "LEN0042", /* Yoga */
 147        "LEN0045",
 148        "LEN0047",
 149        "LEN2000", /* S540 */
 150        "LEN2001", /* Edge E431 */
 151        "LEN2002", /* Edge E531 */
 152        "LEN2003",
 153        "LEN2004", /* L440 */
 154        "LEN2005",
 155        "LEN2006", /* Edge E440/E540 */
 156        "LEN2007",
 157        "LEN2008",
 158        "LEN2009",
 159        "LEN200A",
 160        "LEN200B",
 161        NULL
 162};
 163
 164static const char * const smbus_pnp_ids[] = {
 165        /* all of the topbuttonpad_pnp_ids are valid, we just add some extras */
 166        "LEN0048", /* X1 Carbon 3 */
 167        "LEN0046", /* X250 */
 168        "LEN0049", /* Yoga 11e */
 169        "LEN004a", /* W541 */
 170        "LEN005b", /* P50 */
 171        "LEN005e", /* T560 */
 172        "LEN006c", /* T470s */
 173        "LEN007a", /* T470s */
 174        "LEN0071", /* T480 */
 175        "LEN0072", /* X1 Carbon Gen 5 (2017) - Elan/ALPS trackpoint */
 176        "LEN0073", /* X1 Carbon G5 (Elantech) */
 177        "LEN0091", /* X1 Carbon 6 */
 178        "LEN0092", /* X1 Carbon 6 */
 179        "LEN0093", /* T480 */
 180        "LEN0096", /* X280 */
 181        "LEN0097", /* X280 -> ALPS trackpoint */
 182        "LEN0099", /* X1 Extreme Gen 1 / P1 Gen 1 */
 183        "LEN009b", /* T580 */
 184        "LEN0402", /* X1 Extreme Gen 2 / P1 Gen 2 */
 185        "LEN200f", /* T450s */
 186        "LEN2044", /* L470  */
 187        "LEN2054", /* E480 */
 188        "LEN2055", /* E580 */
 189        "LEN2068", /* T14 Gen 1 */
 190        "SYN3052", /* HP EliteBook 840 G4 */
 191        "SYN3221", /* HP 15-ay000 */
 192        "SYN323d", /* HP Spectre X360 13-w013dx */
 193        "SYN3257", /* HP Envy 13-ad105ng */
 194        NULL
 195};
 196
 197static const char * const forcepad_pnp_ids[] = {
 198        "SYN300D",
 199        "SYN3014",
 200        NULL
 201};
 202
 203/*
 204 * Send a command to the synaptics touchpad by special commands
 205 */
 206static int synaptics_send_cmd(struct psmouse *psmouse, u8 cmd, u8 *param)
 207{
 208        int error;
 209
 210        error = ps2_sliced_command(&psmouse->ps2dev, cmd);
 211        if (error)
 212                return error;
 213
 214        error = ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO);
 215        if (error)
 216                return error;
 217
 218        return 0;
 219}
 220
 221static int synaptics_query_int(struct psmouse *psmouse, u8 query_cmd, u32 *val)
 222{
 223        int error;
 224        union {
 225                __be32 be_val;
 226                char buf[4];
 227        } resp = { 0 };
 228
 229        error = synaptics_send_cmd(psmouse, query_cmd, resp.buf + 1);
 230        if (error)
 231                return error;
 232
 233        *val = be32_to_cpu(resp.be_val);
 234        return 0;
 235}
 236
 237/*
 238 * Identify Touchpad
 239 * See also the SYN_ID_* macros
 240 */
 241static int synaptics_identify(struct psmouse *psmouse,
 242                              struct synaptics_device_info *info)
 243{
 244        int error;
 245
 246        error = synaptics_query_int(psmouse, SYN_QUE_IDENTIFY, &info->identity);
 247        if (error)
 248                return error;
 249
 250        return SYN_ID_IS_SYNAPTICS(info->identity) ? 0 : -ENXIO;
 251}
 252
 253/*
 254 * Read the model-id bytes from the touchpad
 255 * see also SYN_MODEL_* macros
 256 */
 257static int synaptics_model_id(struct psmouse *psmouse,
 258                              struct synaptics_device_info *info)
 259{
 260        return synaptics_query_int(psmouse, SYN_QUE_MODEL, &info->model_id);
 261}
 262
 263/*
 264 * Read the firmware id from the touchpad
 265 */
 266static int synaptics_firmware_id(struct psmouse *psmouse,
 267                                 struct synaptics_device_info *info)
 268{
 269        return synaptics_query_int(psmouse, SYN_QUE_FIRMWARE_ID,
 270                                   &info->firmware_id);
 271}
 272
 273/*
 274 * Read the board id and the "More Extended Queries" from the touchpad
 275 * The board id is encoded in the "QUERY MODES" response
 276 */
 277static int synaptics_query_modes(struct psmouse *psmouse,
 278                                 struct synaptics_device_info *info)
 279{
 280        u8 bid[3];
 281        int error;
 282
 283        /* firmwares prior 7.5 have no board_id encoded */
 284        if (SYN_ID_FULL(info->identity) < 0x705)
 285                return 0;
 286
 287        error = synaptics_send_cmd(psmouse, SYN_QUE_MODES, bid);
 288        if (error)
 289                return error;
 290
 291        info->board_id = ((bid[0] & 0xfc) << 6) | bid[1];
 292
 293        if (SYN_MEXT_CAP_BIT(bid[0]))
 294                return synaptics_query_int(psmouse, SYN_QUE_MEXT_CAPAB_10,
 295                                           &info->ext_cap_10);
 296
 297        return 0;
 298}
 299
 300/*
 301 * Read the capability-bits from the touchpad
 302 * see also the SYN_CAP_* macros
 303 */
 304static int synaptics_capability(struct psmouse *psmouse,
 305                                struct synaptics_device_info *info)
 306{
 307        int error;
 308
 309        error = synaptics_query_int(psmouse, SYN_QUE_CAPABILITIES,
 310                                    &info->capabilities);
 311        if (error)
 312                return error;
 313
 314        info->ext_cap = info->ext_cap_0c = 0;
 315
 316        /*
 317         * Older firmwares had submodel ID fixed to 0x47
 318         */
 319        if (SYN_ID_FULL(info->identity) < 0x705 &&
 320            SYN_CAP_SUBMODEL_ID(info->capabilities) != 0x47) {
 321                return -ENXIO;
 322        }
 323
 324        /*
 325         * Unless capExtended is set the rest of the flags should be ignored
 326         */
 327        if (!SYN_CAP_EXTENDED(info->capabilities))
 328                info->capabilities = 0;
 329
 330        if (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 1) {
 331                error = synaptics_query_int(psmouse, SYN_QUE_EXT_CAPAB,
 332                                            &info->ext_cap);
 333                if (error) {
 334                        psmouse_warn(psmouse,
 335                                     "device claims to have extended capabilities, but I'm not able to read them.\n");
 336                } else {
 337                        /*
 338                         * if nExtBtn is greater than 8 it should be considered
 339                         * invalid and treated as 0
 340                         */
 341                        if (SYN_CAP_MULTI_BUTTON_NO(info->ext_cap) > 8)
 342                                info->ext_cap &= ~SYN_CAP_MB_MASK;
 343                }
 344        }
 345
 346        if (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 4) {
 347                error = synaptics_query_int(psmouse, SYN_QUE_EXT_CAPAB_0C,
 348                                            &info->ext_cap_0c);
 349                if (error)
 350                        psmouse_warn(psmouse,
 351                                     "device claims to have extended capability 0x0c, but I'm not able to read it.\n");
 352        }
 353
 354        return 0;
 355}
 356
 357/*
 358 * Read touchpad resolution and maximum reported coordinates
 359 * Resolution is left zero if touchpad does not support the query
 360 */
 361static int synaptics_resolution(struct psmouse *psmouse,
 362                                struct synaptics_device_info *info)
 363{
 364        u8 resp[3];
 365        int error;
 366
 367        if (SYN_ID_MAJOR(info->identity) < 4)
 368                return 0;
 369
 370        error = synaptics_send_cmd(psmouse, SYN_QUE_RESOLUTION, resp);
 371        if (!error) {
 372                if (resp[0] != 0 && (resp[1] & 0x80) && resp[2] != 0) {
 373                        info->x_res = resp[0]; /* x resolution in units/mm */
 374                        info->y_res = resp[2]; /* y resolution in units/mm */
 375                }
 376        }
 377
 378        if (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 5 &&
 379            SYN_CAP_MAX_DIMENSIONS(info->ext_cap_0c)) {
 380                error = synaptics_send_cmd(psmouse,
 381                                           SYN_QUE_EXT_MAX_COORDS, resp);
 382                if (error) {
 383                        psmouse_warn(psmouse,
 384                                     "device claims to have max coordinates query, but I'm not able to read it.\n");
 385                } else {
 386                        info->x_max = (resp[0] << 5) | ((resp[1] & 0x0f) << 1);
 387                        info->y_max = (resp[2] << 5) | ((resp[1] & 0xf0) >> 3);
 388                        psmouse_info(psmouse,
 389                                     "queried max coordinates: x [..%d], y [..%d]\n",
 390                                     info->x_max, info->y_max);
 391                }
 392        }
 393
 394        if (SYN_CAP_MIN_DIMENSIONS(info->ext_cap_0c) &&
 395            (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 7 ||
 396             /*
 397              * Firmware v8.1 does not report proper number of extended
 398              * capabilities, but has been proven to report correct min
 399              * coordinates.
 400              */
 401             SYN_ID_FULL(info->identity) == 0x801)) {
 402                error = synaptics_send_cmd(psmouse,
 403                                           SYN_QUE_EXT_MIN_COORDS, resp);
 404                if (error) {
 405                        psmouse_warn(psmouse,
 406                                     "device claims to have min coordinates query, but I'm not able to read it.\n");
 407                } else {
 408                        info->x_min = (resp[0] << 5) | ((resp[1] & 0x0f) << 1);
 409                        info->y_min = (resp[2] << 5) | ((resp[1] & 0xf0) >> 3);
 410                        psmouse_info(psmouse,
 411                                     "queried min coordinates: x [%d..], y [%d..]\n",
 412                                     info->x_min, info->y_min);
 413                }
 414        }
 415
 416        return 0;
 417}
 418
 419static int synaptics_query_hardware(struct psmouse *psmouse,
 420                                    struct synaptics_device_info *info)
 421{
 422        int error;
 423
 424        memset(info, 0, sizeof(*info));
 425
 426        error = synaptics_identify(psmouse, info);
 427        if (error)
 428                return error;
 429
 430        error = synaptics_model_id(psmouse, info);
 431        if (error)
 432                return error;
 433
 434        error = synaptics_firmware_id(psmouse, info);
 435        if (error)
 436                return error;
 437
 438        error = synaptics_query_modes(psmouse, info);
 439        if (error)
 440                return error;
 441
 442        error = synaptics_capability(psmouse, info);
 443        if (error)
 444                return error;
 445
 446        error = synaptics_resolution(psmouse, info);
 447        if (error)
 448                return error;
 449
 450        return 0;
 451}
 452
 453#endif /* CONFIG_MOUSE_PS2_SYNAPTICS || CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
 454
 455#ifdef CONFIG_MOUSE_PS2_SYNAPTICS
 456
 457static bool cr48_profile_sensor;
 458
 459#define ANY_BOARD_ID 0
 460struct min_max_quirk {
 461        const char * const *pnp_ids;
 462        struct {
 463                u32 min, max;
 464        } board_id;
 465        u32 x_min, x_max, y_min, y_max;
 466};
 467
 468static const struct min_max_quirk min_max_pnpid_table[] = {
 469        {
 470                (const char * const []){"LEN0033", NULL},
 471                {ANY_BOARD_ID, ANY_BOARD_ID},
 472                1024, 5052, 2258, 4832
 473        },
 474        {
 475                (const char * const []){"LEN0042", NULL},
 476                {ANY_BOARD_ID, ANY_BOARD_ID},
 477                1232, 5710, 1156, 4696
 478        },
 479        {
 480                (const char * const []){"LEN0034", "LEN0036", "LEN0037",
 481                                        "LEN0039", "LEN2002", "LEN2004",
 482                                        NULL},
 483                {ANY_BOARD_ID, 2961},
 484                1024, 5112, 2024, 4832
 485        },
 486        {
 487                (const char * const []){"LEN2000", NULL},
 488                {ANY_BOARD_ID, ANY_BOARD_ID},
 489                1024, 5113, 2021, 4832
 490        },
 491        {
 492                (const char * const []){"LEN2001", NULL},
 493                {ANY_BOARD_ID, ANY_BOARD_ID},
 494                1024, 5022, 2508, 4832
 495        },
 496        {
 497                (const char * const []){"LEN2006", NULL},
 498                {2691, 2691},
 499                1024, 5045, 2457, 4832
 500        },
 501        {
 502                (const char * const []){"LEN2006", NULL},
 503                {ANY_BOARD_ID, ANY_BOARD_ID},
 504                1264, 5675, 1171, 4688
 505        },
 506        { }
 507};
 508
 509/*****************************************************************************
 510 *      Synaptics communications functions
 511 ****************************************************************************/
 512
 513/*
 514 * Synaptics touchpads report the y coordinate from bottom to top, which is
 515 * opposite from what userspace expects.
 516 * This function is used to invert y before reporting.
 517 */
 518static int synaptics_invert_y(int y)
 519{
 520        return YMAX_NOMINAL + YMIN_NOMINAL - y;
 521}
 522
 523/*
 524 * Apply quirk(s) if the hardware matches
 525 */
 526static void synaptics_apply_quirks(struct psmouse *psmouse,
 527                                   struct synaptics_device_info *info)
 528{
 529        int i;
 530
 531        for (i = 0; min_max_pnpid_table[i].pnp_ids; i++) {
 532                if (!psmouse_matches_pnp_id(psmouse,
 533                                            min_max_pnpid_table[i].pnp_ids))
 534                        continue;
 535
 536                if (min_max_pnpid_table[i].board_id.min != ANY_BOARD_ID &&
 537                    info->board_id < min_max_pnpid_table[i].board_id.min)
 538                        continue;
 539
 540                if (min_max_pnpid_table[i].board_id.max != ANY_BOARD_ID &&
 541                    info->board_id > min_max_pnpid_table[i].board_id.max)
 542                        continue;
 543
 544                info->x_min = min_max_pnpid_table[i].x_min;
 545                info->x_max = min_max_pnpid_table[i].x_max;
 546                info->y_min = min_max_pnpid_table[i].y_min;
 547                info->y_max = min_max_pnpid_table[i].y_max;
 548                psmouse_info(psmouse,
 549                             "quirked min/max coordinates: x [%d..%d], y [%d..%d]\n",
 550                             info->x_min, info->x_max,
 551                             info->y_min, info->y_max);
 552                break;
 553        }
 554}
 555
 556static bool synaptics_has_agm(struct synaptics_data *priv)
 557{
 558        return (SYN_CAP_ADV_GESTURE(priv->info.ext_cap_0c) ||
 559                SYN_CAP_IMAGE_SENSOR(priv->info.ext_cap_0c));
 560}
 561
 562static int synaptics_set_advanced_gesture_mode(struct psmouse *psmouse)
 563{
 564        static u8 param = 0xc8;
 565        int error;
 566
 567        error = ps2_sliced_command(&psmouse->ps2dev, SYN_QUE_MODEL);
 568        if (error)
 569                return error;
 570
 571        error = ps2_command(&psmouse->ps2dev, &param, PSMOUSE_CMD_SETRATE);
 572        if (error)
 573                return error;
 574
 575        return 0;
 576}
 577
 578static int synaptics_set_mode(struct psmouse *psmouse)
 579{
 580        struct synaptics_data *priv = psmouse->private;
 581        int error;
 582
 583        priv->mode = 0;
 584        if (priv->absolute_mode)
 585                priv->mode |= SYN_BIT_ABSOLUTE_MODE;
 586        if (priv->disable_gesture)
 587                priv->mode |= SYN_BIT_DISABLE_GESTURE;
 588        if (psmouse->rate >= 80)
 589                priv->mode |= SYN_BIT_HIGH_RATE;
 590        if (SYN_CAP_EXTENDED(priv->info.capabilities))
 591                priv->mode |= SYN_BIT_W_MODE;
 592
 593        error = synaptics_mode_cmd(psmouse, priv->mode);
 594        if (error)
 595                return error;
 596
 597        if (priv->absolute_mode && synaptics_has_agm(priv)) {
 598                error = synaptics_set_advanced_gesture_mode(psmouse);
 599                if (error) {
 600                        psmouse_err(psmouse,
 601                                    "Advanced gesture mode init failed: %d\n",
 602                                    error);
 603                        return error;
 604                }
 605        }
 606
 607        return 0;
 608}
 609
 610static void synaptics_set_rate(struct psmouse *psmouse, unsigned int rate)
 611{
 612        struct synaptics_data *priv = psmouse->private;
 613
 614        if (rate >= 80) {
 615                priv->mode |= SYN_BIT_HIGH_RATE;
 616                psmouse->rate = 80;
 617        } else {
 618                priv->mode &= ~SYN_BIT_HIGH_RATE;
 619                psmouse->rate = 40;
 620        }
 621
 622        synaptics_mode_cmd(psmouse, priv->mode);
 623}
 624
 625/*****************************************************************************
 626 *      Synaptics pass-through PS/2 port support
 627 ****************************************************************************/
 628static int synaptics_pt_write(struct serio *serio, u8 c)
 629{
 630        struct psmouse *parent = serio_get_drvdata(serio->parent);
 631        u8 rate_param = SYN_PS_CLIENT_CMD; /* indicates that we want pass-through port */
 632        int error;
 633
 634        error = ps2_sliced_command(&parent->ps2dev, c);
 635        if (error)
 636                return error;
 637
 638        error = ps2_command(&parent->ps2dev, &rate_param, PSMOUSE_CMD_SETRATE);
 639        if (error)
 640                return error;
 641
 642        return 0;
 643}
 644
 645static int synaptics_pt_start(struct serio *serio)
 646{
 647        struct psmouse *parent = serio_get_drvdata(serio->parent);
 648        struct synaptics_data *priv = parent->private;
 649
 650        serio_pause_rx(parent->ps2dev.serio);
 651        priv->pt_port = serio;
 652        serio_continue_rx(parent->ps2dev.serio);
 653
 654        return 0;
 655}
 656
 657static void synaptics_pt_stop(struct serio *serio)
 658{
 659        struct psmouse *parent = serio_get_drvdata(serio->parent);
 660        struct synaptics_data *priv = parent->private;
 661
 662        serio_pause_rx(parent->ps2dev.serio);
 663        priv->pt_port = NULL;
 664        serio_continue_rx(parent->ps2dev.serio);
 665}
 666
 667static int synaptics_is_pt_packet(u8 *buf)
 668{
 669        return (buf[0] & 0xFC) == 0x84 && (buf[3] & 0xCC) == 0xC4;
 670}
 671
 672static void synaptics_pass_pt_packet(struct serio *ptport, u8 *packet)
 673{
 674        struct psmouse *child = serio_get_drvdata(ptport);
 675
 676        if (child && child->state == PSMOUSE_ACTIVATED) {
 677                serio_interrupt(ptport, packet[1], 0);
 678                serio_interrupt(ptport, packet[4], 0);
 679                serio_interrupt(ptport, packet[5], 0);
 680                if (child->pktsize == 4)
 681                        serio_interrupt(ptport, packet[2], 0);
 682        } else {
 683                serio_interrupt(ptport, packet[1], 0);
 684        }
 685}
 686
 687static void synaptics_pt_activate(struct psmouse *psmouse)
 688{
 689        struct synaptics_data *priv = psmouse->private;
 690        struct psmouse *child = serio_get_drvdata(priv->pt_port);
 691
 692        /* adjust the touchpad to child's choice of protocol */
 693        if (child) {
 694                if (child->pktsize == 4)
 695                        priv->mode |= SYN_BIT_FOUR_BYTE_CLIENT;
 696                else
 697                        priv->mode &= ~SYN_BIT_FOUR_BYTE_CLIENT;
 698
 699                if (synaptics_mode_cmd(psmouse, priv->mode))
 700                        psmouse_warn(psmouse,
 701                                     "failed to switch guest protocol\n");
 702        }
 703}
 704
 705static void synaptics_pt_create(struct psmouse *psmouse)
 706{
 707        struct serio *serio;
 708
 709        serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
 710        if (!serio) {
 711                psmouse_err(psmouse,
 712                            "not enough memory for pass-through port\n");
 713                return;
 714        }
 715
 716        serio->id.type = SERIO_PS_PSTHRU;
 717        strlcpy(serio->name, "Synaptics pass-through", sizeof(serio->name));
 718        strlcpy(serio->phys, "synaptics-pt/serio0", sizeof(serio->phys));
 719        serio->write = synaptics_pt_write;
 720        serio->start = synaptics_pt_start;
 721        serio->stop = synaptics_pt_stop;
 722        serio->parent = psmouse->ps2dev.serio;
 723
 724        psmouse->pt_activate = synaptics_pt_activate;
 725
 726        psmouse_info(psmouse, "serio: %s port at %s\n",
 727                     serio->name, psmouse->phys);
 728        serio_register_port(serio);
 729}
 730
 731/*****************************************************************************
 732 *      Functions to interpret the absolute mode packets
 733 ****************************************************************************/
 734
 735static void synaptics_parse_agm(const u8 buf[],
 736                                struct synaptics_data *priv,
 737                                struct synaptics_hw_state *hw)
 738{
 739        struct synaptics_hw_state *agm = &priv->agm;
 740        int agm_packet_type;
 741
 742        agm_packet_type = (buf[5] & 0x30) >> 4;
 743        switch (agm_packet_type) {
 744        case 1:
 745                /* Gesture packet: (x, y, z) half resolution */
 746                agm->w = hw->w;
 747                agm->x = (((buf[4] & 0x0f) << 8) | buf[1]) << 1;
 748                agm->y = (((buf[4] & 0xf0) << 4) | buf[2]) << 1;
 749                agm->z = ((buf[3] & 0x30) | (buf[5] & 0x0f)) << 1;
 750                break;
 751
 752        case 2:
 753                /* AGM-CONTACT packet: we are only interested in the count */
 754                priv->agm_count = buf[1];
 755                break;
 756
 757        default:
 758                break;
 759        }
 760}
 761
 762static void synaptics_parse_ext_buttons(const u8 buf[],
 763                                        struct synaptics_data *priv,
 764                                        struct synaptics_hw_state *hw)
 765{
 766        unsigned int ext_bits =
 767                (SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap) + 1) >> 1;
 768        unsigned int ext_mask = GENMASK(ext_bits - 1, 0);
 769
 770        hw->ext_buttons = buf[4] & ext_mask;
 771        hw->ext_buttons |= (buf[5] & ext_mask) << ext_bits;
 772}
 773
 774static int synaptics_parse_hw_state(const u8 buf[],
 775                                    struct synaptics_data *priv,
 776                                    struct synaptics_hw_state *hw)
 777{
 778        memset(hw, 0, sizeof(struct synaptics_hw_state));
 779
 780        if (SYN_MODEL_NEWABS(priv->info.model_id)) {
 781                hw->w = (((buf[0] & 0x30) >> 2) |
 782                         ((buf[0] & 0x04) >> 1) |
 783                         ((buf[3] & 0x04) >> 2));
 784
 785                if (synaptics_has_agm(priv) && hw->w == 2) {
 786                        synaptics_parse_agm(buf, priv, hw);
 787                        return 1;
 788                }
 789
 790                hw->x = (((buf[3] & 0x10) << 8) |
 791                         ((buf[1] & 0x0f) << 8) |
 792                         buf[4]);
 793                hw->y = (((buf[3] & 0x20) << 7) |
 794                         ((buf[1] & 0xf0) << 4) |
 795                         buf[5]);
 796                hw->z = buf[2];
 797
 798                hw->left  = (buf[0] & 0x01) ? 1 : 0;
 799                hw->right = (buf[0] & 0x02) ? 1 : 0;
 800
 801                if (priv->is_forcepad) {
 802                        /*
 803                         * ForcePads, like Clickpads, use middle button
 804                         * bits to report primary button clicks.
 805                         * Unfortunately they report primary button not
 806                         * only when user presses on the pad above certain
 807                         * threshold, but also when there are more than one
 808                         * finger on the touchpad, which interferes with
 809                         * out multi-finger gestures.
 810                         */
 811                        if (hw->z == 0) {
 812                                /* No contacts */
 813                                priv->press = priv->report_press = false;
 814                        } else if (hw->w >= 4 && ((buf[0] ^ buf[3]) & 0x01)) {
 815                                /*
 816                                 * Single-finger touch with pressure above
 817                                 * the threshold. If pressure stays long
 818                                 * enough, we'll start reporting primary
 819                                 * button. We rely on the device continuing
 820                                 * sending data even if finger does not
 821                                 * move.
 822                                 */
 823                                if  (!priv->press) {
 824                                        priv->press_start = jiffies;
 825                                        priv->press = true;
 826                                } else if (time_after(jiffies,
 827                                                priv->press_start +
 828                                                        msecs_to_jiffies(50))) {
 829                                        priv->report_press = true;
 830                                }
 831                        } else {
 832                                priv->press = false;
 833                        }
 834
 835                        hw->left = priv->report_press;
 836
 837                } else if (SYN_CAP_CLICKPAD(priv->info.ext_cap_0c)) {
 838                        /*
 839                         * Clickpad's button is transmitted as middle button,
 840                         * however, since it is primary button, we will report
 841                         * it as BTN_LEFT.
 842                         */
 843                        hw->left = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
 844
 845                } else if (SYN_CAP_MIDDLE_BUTTON(priv->info.capabilities)) {
 846                        hw->middle = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
 847                        if (hw->w == 2)
 848                                hw->scroll = (s8)buf[1];
 849                }
 850
 851                if (SYN_CAP_FOUR_BUTTON(priv->info.capabilities)) {
 852                        hw->up   = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
 853                        hw->down = ((buf[0] ^ buf[3]) & 0x02) ? 1 : 0;
 854                }
 855
 856                if (SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap) > 0 &&
 857                    ((buf[0] ^ buf[3]) & 0x02)) {
 858                        synaptics_parse_ext_buttons(buf, priv, hw);
 859                }
 860        } else {
 861                hw->x = (((buf[1] & 0x1f) << 8) | buf[2]);
 862                hw->y = (((buf[4] & 0x1f) << 8) | buf[5]);
 863
 864                hw->z = (((buf[0] & 0x30) << 2) | (buf[3] & 0x3F));
 865                hw->w = (((buf[1] & 0x80) >> 4) | ((buf[0] & 0x04) >> 1));
 866
 867                hw->left  = (buf[0] & 0x01) ? 1 : 0;
 868                hw->right = (buf[0] & 0x02) ? 1 : 0;
 869        }
 870
 871        /*
 872         * Convert wrap-around values to negative. (X|Y)_MAX_POSITIVE
 873         * is used by some firmware to indicate a finger at the edge of
 874         * the touchpad whose precise position cannot be determined, so
 875         * convert these values to the maximum axis value.
 876         */
 877        if (hw->x > X_MAX_POSITIVE)
 878                hw->x -= 1 << ABS_POS_BITS;
 879        else if (hw->x == X_MAX_POSITIVE)
 880                hw->x = XMAX;
 881
 882        if (hw->y > Y_MAX_POSITIVE)
 883                hw->y -= 1 << ABS_POS_BITS;
 884        else if (hw->y == Y_MAX_POSITIVE)
 885                hw->y = YMAX;
 886
 887        return 0;
 888}
 889
 890static void synaptics_report_semi_mt_slot(struct input_dev *dev, int slot,
 891                                          bool active, int x, int y)
 892{
 893        input_mt_slot(dev, slot);
 894        input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
 895        if (active) {
 896                input_report_abs(dev, ABS_MT_POSITION_X, x);
 897                input_report_abs(dev, ABS_MT_POSITION_Y, synaptics_invert_y(y));
 898        }
 899}
 900
 901static void synaptics_report_semi_mt_data(struct input_dev *dev,
 902                                          const struct synaptics_hw_state *a,
 903                                          const struct synaptics_hw_state *b,
 904                                          int num_fingers)
 905{
 906        if (num_fingers >= 2) {
 907                synaptics_report_semi_mt_slot(dev, 0, true, min(a->x, b->x),
 908                                              min(a->y, b->y));
 909                synaptics_report_semi_mt_slot(dev, 1, true, max(a->x, b->x),
 910                                              max(a->y, b->y));
 911        } else if (num_fingers == 1) {
 912                synaptics_report_semi_mt_slot(dev, 0, true, a->x, a->y);
 913                synaptics_report_semi_mt_slot(dev, 1, false, 0, 0);
 914        } else {
 915                synaptics_report_semi_mt_slot(dev, 0, false, 0, 0);
 916                synaptics_report_semi_mt_slot(dev, 1, false, 0, 0);
 917        }
 918}
 919
 920static void synaptics_report_ext_buttons(struct psmouse *psmouse,
 921                                         const struct synaptics_hw_state *hw)
 922{
 923        struct input_dev *dev = psmouse->dev;
 924        struct synaptics_data *priv = psmouse->private;
 925        int ext_bits = (SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap) + 1) >> 1;
 926        int i;
 927
 928        if (!SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap))
 929                return;
 930
 931        /* Bug in FW 8.1 & 8.2, buttons are reported only when ExtBit is 1 */
 932        if ((SYN_ID_FULL(priv->info.identity) == 0x801 ||
 933             SYN_ID_FULL(priv->info.identity) == 0x802) &&
 934            !((psmouse->packet[0] ^ psmouse->packet[3]) & 0x02))
 935                return;
 936
 937        if (!SYN_CAP_EXT_BUTTONS_STICK(priv->info.ext_cap_10)) {
 938                for (i = 0; i < ext_bits; i++) {
 939                        input_report_key(dev, BTN_0 + 2 * i,
 940                                hw->ext_buttons & BIT(i));
 941                        input_report_key(dev, BTN_1 + 2 * i,
 942                                hw->ext_buttons & BIT(i + ext_bits));
 943                }
 944                return;
 945        }
 946
 947        /*
 948         * This generation of touchpads has the trackstick buttons
 949         * physically wired to the touchpad. Re-route them through
 950         * the pass-through interface.
 951         */
 952        if (priv->pt_port) {
 953                u8 pt_buttons;
 954
 955                /* The trackstick expects at most 3 buttons */
 956                pt_buttons = SYN_EXT_BUTTON_STICK_L(hw->ext_buttons)      |
 957                             SYN_EXT_BUTTON_STICK_R(hw->ext_buttons) << 1 |
 958                             SYN_EXT_BUTTON_STICK_M(hw->ext_buttons) << 2;
 959
 960                serio_interrupt(priv->pt_port,
 961                                PSMOUSE_OOB_EXTRA_BTNS, SERIO_OOB_DATA);
 962                serio_interrupt(priv->pt_port, pt_buttons, SERIO_OOB_DATA);
 963        }
 964}
 965
 966static void synaptics_report_buttons(struct psmouse *psmouse,
 967                                     const struct synaptics_hw_state *hw)
 968{
 969        struct input_dev *dev = psmouse->dev;
 970        struct synaptics_data *priv = psmouse->private;
 971
 972        input_report_key(dev, BTN_LEFT, hw->left);
 973        input_report_key(dev, BTN_RIGHT, hw->right);
 974
 975        if (SYN_CAP_MIDDLE_BUTTON(priv->info.capabilities))
 976                input_report_key(dev, BTN_MIDDLE, hw->middle);
 977
 978        if (SYN_CAP_FOUR_BUTTON(priv->info.capabilities)) {
 979                input_report_key(dev, BTN_FORWARD, hw->up);
 980                input_report_key(dev, BTN_BACK, hw->down);
 981        }
 982
 983        synaptics_report_ext_buttons(psmouse, hw);
 984}
 985
 986static void synaptics_report_mt_data(struct psmouse *psmouse,
 987                                     const struct synaptics_hw_state *sgm,
 988                                     int num_fingers)
 989{
 990        struct input_dev *dev = psmouse->dev;
 991        struct synaptics_data *priv = psmouse->private;
 992        const struct synaptics_hw_state *hw[2] = { sgm, &priv->agm };
 993        struct input_mt_pos pos[2];
 994        int slot[2], nsemi, i;
 995
 996        nsemi = clamp_val(num_fingers, 0, 2);
 997
 998        for (i = 0; i < nsemi; i++) {
 999                pos[i].x = hw[i]->x;
1000                pos[i].y = synaptics_invert_y(hw[i]->y);
1001        }
1002
1003        input_mt_assign_slots(dev, slot, pos, nsemi, DMAX * priv->info.x_res);
1004
1005        for (i = 0; i < nsemi; i++) {
1006                input_mt_slot(dev, slot[i]);
1007                input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
1008                input_report_abs(dev, ABS_MT_POSITION_X, pos[i].x);
1009                input_report_abs(dev, ABS_MT_POSITION_Y, pos[i].y);
1010                input_report_abs(dev, ABS_MT_PRESSURE, hw[i]->z);
1011        }
1012
1013        input_mt_drop_unused(dev);
1014
1015        /* Don't use active slot count to generate BTN_TOOL events. */
1016        input_mt_report_pointer_emulation(dev, false);
1017
1018        /* Send the number of fingers reported by touchpad itself. */
1019        input_mt_report_finger_count(dev, num_fingers);
1020
1021        synaptics_report_buttons(psmouse, sgm);
1022
1023        input_sync(dev);
1024}
1025
1026static void synaptics_image_sensor_process(struct psmouse *psmouse,
1027                                           struct synaptics_hw_state *sgm)
1028{
1029        struct synaptics_data *priv = psmouse->private;
1030        int num_fingers;
1031
1032        /*
1033         * Update mt_state using the new finger count and current mt_state.
1034         */
1035        if (sgm->z == 0)
1036                num_fingers = 0;
1037        else if (sgm->w >= 4)
1038                num_fingers = 1;
1039        else if (sgm->w == 0)
1040                num_fingers = 2;
1041        else if (sgm->w == 1)
1042                num_fingers = priv->agm_count ? priv->agm_count : 3;
1043        else
1044                num_fingers = 4;
1045
1046        /* Send resulting input events to user space */
1047        synaptics_report_mt_data(psmouse, sgm, num_fingers);
1048}
1049
1050static bool synaptics_has_multifinger(struct synaptics_data *priv)
1051{
1052        if (SYN_CAP_MULTIFINGER(priv->info.capabilities))
1053                return true;
1054
1055        /* Advanced gesture mode also sends multi finger data */
1056        return synaptics_has_agm(priv);
1057}
1058
1059/*
1060 *  called for each full received packet from the touchpad
1061 */
1062static void synaptics_process_packet(struct psmouse *psmouse)
1063{
1064        struct input_dev *dev = psmouse->dev;
1065        struct synaptics_data *priv = psmouse->private;
1066        struct synaptics_device_info *info = &priv->info;
1067        struct synaptics_hw_state hw;
1068        int num_fingers;
1069        int finger_width;
1070
1071        if (synaptics_parse_hw_state(psmouse->packet, priv, &hw))
1072                return;
1073
1074        if (SYN_CAP_IMAGE_SENSOR(info->ext_cap_0c)) {
1075                synaptics_image_sensor_process(psmouse, &hw);
1076                return;
1077        }
1078
1079        if (hw.scroll) {
1080                priv->scroll += hw.scroll;
1081
1082                while (priv->scroll >= 4) {
1083                        input_report_key(dev, BTN_BACK, !hw.down);
1084                        input_sync(dev);
1085                        input_report_key(dev, BTN_BACK, hw.down);
1086                        input_sync(dev);
1087                        priv->scroll -= 4;
1088                }
1089                while (priv->scroll <= -4) {
1090                        input_report_key(dev, BTN_FORWARD, !hw.up);
1091                        input_sync(dev);
1092                        input_report_key(dev, BTN_FORWARD, hw.up);
1093                        input_sync(dev);
1094                        priv->scroll += 4;
1095                }
1096                return;
1097        }
1098
1099        if (hw.z > 0 && hw.x > 1) {
1100                num_fingers = 1;
1101                finger_width = 5;
1102                if (SYN_CAP_EXTENDED(info->capabilities)) {
1103                        switch (hw.w) {
1104                        case 0 ... 1:
1105                                if (synaptics_has_multifinger(priv))
1106                                        num_fingers = hw.w + 2;
1107                                break;
1108                        case 2:
1109                                /*
1110                                 * SYN_MODEL_PEN(info->model_id): even if
1111                                 * the device supports pen, we treat it as
1112                                 * a single finger.
1113                                 */
1114                                break;
1115                        case 4 ... 15:
1116                                if (SYN_CAP_PALMDETECT(info->capabilities))
1117                                        finger_width = hw.w;
1118                                break;
1119                        }
1120                }
1121        } else {
1122                num_fingers = 0;
1123                finger_width = 0;
1124        }
1125
1126        if (cr48_profile_sensor) {
1127                synaptics_report_mt_data(psmouse, &hw, num_fingers);
1128                return;
1129        }
1130
1131        if (SYN_CAP_ADV_GESTURE(info->ext_cap_0c))
1132                synaptics_report_semi_mt_data(dev, &hw, &priv->agm,
1133                                              num_fingers);
1134
1135        /* Post events
1136         * BTN_TOUCH has to be first as mousedev relies on it when doing
1137         * absolute -> relative conversion
1138         */
1139        if (hw.z > 30) input_report_key(dev, BTN_TOUCH, 1);
1140        if (hw.z < 25) input_report_key(dev, BTN_TOUCH, 0);
1141
1142        if (num_fingers > 0) {
1143                input_report_abs(dev, ABS_X, hw.x);
1144                input_report_abs(dev, ABS_Y, synaptics_invert_y(hw.y));
1145        }
1146        input_report_abs(dev, ABS_PRESSURE, hw.z);
1147
1148        if (SYN_CAP_PALMDETECT(info->capabilities))
1149                input_report_abs(dev, ABS_TOOL_WIDTH, finger_width);
1150
1151        input_report_key(dev, BTN_TOOL_FINGER, num_fingers == 1);
1152        if (synaptics_has_multifinger(priv)) {
1153                input_report_key(dev, BTN_TOOL_DOUBLETAP, num_fingers == 2);
1154                input_report_key(dev, BTN_TOOL_TRIPLETAP, num_fingers == 3);
1155        }
1156
1157        synaptics_report_buttons(psmouse, &hw);
1158
1159        input_sync(dev);
1160}
1161
1162static bool synaptics_validate_byte(struct psmouse *psmouse,
1163                                    int idx, enum synaptics_pkt_type pkt_type)
1164{
1165        static const u8 newabs_mask[]     = { 0xC8, 0x00, 0x00, 0xC8, 0x00 };
1166        static const u8 newabs_rel_mask[] = { 0xC0, 0x00, 0x00, 0xC0, 0x00 };
1167        static const u8 newabs_rslt[]     = { 0x80, 0x00, 0x00, 0xC0, 0x00 };
1168        static const u8 oldabs_mask[]     = { 0xC0, 0x60, 0x00, 0xC0, 0x60 };
1169        static const u8 oldabs_rslt[]     = { 0xC0, 0x00, 0x00, 0x80, 0x00 };
1170        const u8 *packet = psmouse->packet;
1171
1172        if (idx < 0 || idx > 4)
1173                return false;
1174
1175        switch (pkt_type) {
1176
1177        case SYN_NEWABS:
1178        case SYN_NEWABS_RELAXED:
1179                return (packet[idx] & newabs_rel_mask[idx]) == newabs_rslt[idx];
1180
1181        case SYN_NEWABS_STRICT:
1182                return (packet[idx] & newabs_mask[idx]) == newabs_rslt[idx];
1183
1184        case SYN_OLDABS:
1185                return (packet[idx] & oldabs_mask[idx]) == oldabs_rslt[idx];
1186
1187        default:
1188                psmouse_err(psmouse, "unknown packet type %d\n", pkt_type);
1189                return false;
1190        }
1191}
1192
1193static enum synaptics_pkt_type
1194synaptics_detect_pkt_type(struct psmouse *psmouse)
1195{
1196        int i;
1197
1198        for (i = 0; i < 5; i++) {
1199                if (!synaptics_validate_byte(psmouse, i, SYN_NEWABS_STRICT)) {
1200                        psmouse_info(psmouse, "using relaxed packet validation\n");
1201                        return SYN_NEWABS_RELAXED;
1202                }
1203        }
1204
1205        return SYN_NEWABS_STRICT;
1206}
1207
1208static psmouse_ret_t synaptics_process_byte(struct psmouse *psmouse)
1209{
1210        struct synaptics_data *priv = psmouse->private;
1211
1212        if (psmouse->pktcnt >= 6) { /* Full packet received */
1213                if (unlikely(priv->pkt_type == SYN_NEWABS))
1214                        priv->pkt_type = synaptics_detect_pkt_type(psmouse);
1215
1216                if (SYN_CAP_PASS_THROUGH(priv->info.capabilities) &&
1217                    synaptics_is_pt_packet(psmouse->packet)) {
1218                        if (priv->pt_port)
1219                                synaptics_pass_pt_packet(priv->pt_port,
1220                                                         psmouse->packet);
1221                } else
1222                        synaptics_process_packet(psmouse);
1223
1224                return PSMOUSE_FULL_PACKET;
1225        }
1226
1227        return synaptics_validate_byte(psmouse, psmouse->pktcnt - 1, priv->pkt_type) ?
1228                PSMOUSE_GOOD_DATA : PSMOUSE_BAD_DATA;
1229}
1230
1231/*****************************************************************************
1232 *      Driver initialization/cleanup functions
1233 ****************************************************************************/
1234static void set_abs_position_params(struct input_dev *dev,
1235                                    struct synaptics_device_info *info,
1236                                    int x_code, int y_code)
1237{
1238        int x_min = info->x_min ?: XMIN_NOMINAL;
1239        int x_max = info->x_max ?: XMAX_NOMINAL;
1240        int y_min = info->y_min ?: YMIN_NOMINAL;
1241        int y_max = info->y_max ?: YMAX_NOMINAL;
1242        int fuzz = SYN_CAP_REDUCED_FILTERING(info->ext_cap_0c) ?
1243                        SYN_REDUCED_FILTER_FUZZ : 0;
1244
1245        input_set_abs_params(dev, x_code, x_min, x_max, fuzz, 0);
1246        input_set_abs_params(dev, y_code, y_min, y_max, fuzz, 0);
1247        input_abs_set_res(dev, x_code, info->x_res);
1248        input_abs_set_res(dev, y_code, info->y_res);
1249}
1250
1251static int set_input_params(struct psmouse *psmouse,
1252                            struct synaptics_data *priv)
1253{
1254        struct input_dev *dev = psmouse->dev;
1255        struct synaptics_device_info *info = &priv->info;
1256        int i;
1257        int error;
1258
1259        /* Reset default psmouse capabilities */
1260        __clear_bit(EV_REL, dev->evbit);
1261        bitmap_zero(dev->relbit, REL_CNT);
1262        bitmap_zero(dev->keybit, KEY_CNT);
1263
1264        /* Things that apply to both modes */
1265        __set_bit(INPUT_PROP_POINTER, dev->propbit);
1266
1267        input_set_capability(dev, EV_KEY, BTN_LEFT);
1268
1269        /* Clickpads report only left button */
1270        if (!SYN_CAP_CLICKPAD(info->ext_cap_0c)) {
1271                input_set_capability(dev, EV_KEY, BTN_RIGHT);
1272                if (SYN_CAP_MIDDLE_BUTTON(info->capabilities))
1273                        input_set_capability(dev, EV_KEY, BTN_MIDDLE);
1274        }
1275
1276        if (!priv->absolute_mode) {
1277                /* Relative mode */
1278                input_set_capability(dev, EV_REL, REL_X);
1279                input_set_capability(dev, EV_REL, REL_Y);
1280                return 0;
1281        }
1282
1283        /* Absolute mode */
1284        set_abs_position_params(dev, &priv->info, ABS_X, ABS_Y);
1285        input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
1286
1287        if (cr48_profile_sensor)
1288                input_set_abs_params(dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
1289
1290        if (SYN_CAP_IMAGE_SENSOR(info->ext_cap_0c)) {
1291                set_abs_position_params(dev, info,
1292                                        ABS_MT_POSITION_X, ABS_MT_POSITION_Y);
1293                /* Image sensors can report per-contact pressure */
1294                input_set_abs_params(dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
1295
1296                error = input_mt_init_slots(dev, 2,
1297                                            INPUT_MT_POINTER | INPUT_MT_TRACK);
1298                if (error)
1299                        return error;
1300
1301                /* Image sensors can signal 4 and 5 finger clicks */
1302                input_set_capability(dev, EV_KEY, BTN_TOOL_QUADTAP);
1303                input_set_capability(dev, EV_KEY, BTN_TOOL_QUINTTAP);
1304        } else if (SYN_CAP_ADV_GESTURE(info->ext_cap_0c)) {
1305                set_abs_position_params(dev, info,
1306                                        ABS_MT_POSITION_X, ABS_MT_POSITION_Y);
1307                /*
1308                 * Profile sensor in CR-48 tracks contacts reasonably well,
1309                 * other non-image sensors with AGM use semi-mt.
1310                 */
1311                error = input_mt_init_slots(dev, 2,
1312                                            INPUT_MT_POINTER |
1313                                             (cr48_profile_sensor ?
1314                                              INPUT_MT_TRACK :
1315                                              INPUT_MT_SEMI_MT));
1316                if (error)
1317                        return error;
1318
1319                /*
1320                 * For semi-mt devices we send ABS_X/Y ourselves instead of
1321                 * input_mt_report_pointer_emulation. But
1322                 * input_mt_init_slots() resets the fuzz to 0, leading to a
1323                 * filtered ABS_MT_POSITION_X but an unfiltered ABS_X
1324                 * position. Let's re-initialize ABS_X/Y here.
1325                 */
1326                if (!cr48_profile_sensor)
1327                        set_abs_position_params(dev, &priv->info, ABS_X, ABS_Y);
1328        }
1329
1330        if (SYN_CAP_PALMDETECT(info->capabilities))
1331                input_set_abs_params(dev, ABS_TOOL_WIDTH, 0, 15, 0, 0);
1332
1333        input_set_capability(dev, EV_KEY, BTN_TOUCH);
1334        input_set_capability(dev, EV_KEY, BTN_TOOL_FINGER);
1335
1336        if (synaptics_has_multifinger(priv)) {
1337                input_set_capability(dev, EV_KEY, BTN_TOOL_DOUBLETAP);
1338                input_set_capability(dev, EV_KEY, BTN_TOOL_TRIPLETAP);
1339        }
1340
1341        if (SYN_CAP_FOUR_BUTTON(info->capabilities) ||
1342            SYN_CAP_MIDDLE_BUTTON(info->capabilities)) {
1343                input_set_capability(dev, EV_KEY, BTN_FORWARD);
1344                input_set_capability(dev, EV_KEY, BTN_BACK);
1345        }
1346
1347        if (!SYN_CAP_EXT_BUTTONS_STICK(info->ext_cap_10))
1348                for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(info->ext_cap); i++)
1349                        input_set_capability(dev, EV_KEY, BTN_0 + i);
1350
1351        if (SYN_CAP_CLICKPAD(info->ext_cap_0c)) {
1352                __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
1353                if (psmouse_matches_pnp_id(psmouse, topbuttonpad_pnp_ids) &&
1354                    !SYN_CAP_EXT_BUTTONS_STICK(info->ext_cap_10))
1355                        __set_bit(INPUT_PROP_TOPBUTTONPAD, dev->propbit);
1356        }
1357
1358        return 0;
1359}
1360
1361static ssize_t synaptics_show_disable_gesture(struct psmouse *psmouse,
1362                                              void *data, char *buf)
1363{
1364        struct synaptics_data *priv = psmouse->private;
1365
1366        return sprintf(buf, "%c\n", priv->disable_gesture ? '1' : '0');
1367}
1368
1369static ssize_t synaptics_set_disable_gesture(struct psmouse *psmouse,
1370                                             void *data, const char *buf,
1371                                             size_t len)
1372{
1373        struct synaptics_data *priv = psmouse->private;
1374        unsigned int value;
1375        int err;
1376
1377        err = kstrtouint(buf, 10, &value);
1378        if (err)
1379                return err;
1380
1381        if (value > 1)
1382                return -EINVAL;
1383
1384        if (value == priv->disable_gesture)
1385                return len;
1386
1387        priv->disable_gesture = value;
1388        if (value)
1389                priv->mode |= SYN_BIT_DISABLE_GESTURE;
1390        else
1391                priv->mode &= ~SYN_BIT_DISABLE_GESTURE;
1392
1393        if (synaptics_mode_cmd(psmouse, priv->mode))
1394                return -EIO;
1395
1396        return len;
1397}
1398
1399PSMOUSE_DEFINE_ATTR(disable_gesture, S_IWUSR | S_IRUGO, NULL,
1400                    synaptics_show_disable_gesture,
1401                    synaptics_set_disable_gesture);
1402
1403static void synaptics_disconnect(struct psmouse *psmouse)
1404{
1405        struct synaptics_data *priv = psmouse->private;
1406
1407        /*
1408         * We might have left a breadcrumb when trying to
1409         * set up SMbus companion.
1410         */
1411        psmouse_smbus_cleanup(psmouse);
1412
1413        if (!priv->absolute_mode &&
1414                        SYN_ID_DISGEST_SUPPORTED(priv->info.identity))
1415                device_remove_file(&psmouse->ps2dev.serio->dev,
1416                                   &psmouse_attr_disable_gesture.dattr);
1417
1418        synaptics_reset(psmouse);
1419        kfree(priv);
1420        psmouse->private = NULL;
1421}
1422
1423static int synaptics_reconnect(struct psmouse *psmouse)
1424{
1425        struct synaptics_data *priv = psmouse->private;
1426        struct synaptics_device_info info;
1427        u8 param[2];
1428        int retry = 0;
1429        int error;
1430
1431        do {
1432                psmouse_reset(psmouse);
1433                if (retry) {
1434                        /*
1435                         * On some boxes, right after resuming, the touchpad
1436                         * needs some time to finish initializing (I assume
1437                         * it needs time to calibrate) and start responding
1438                         * to Synaptics-specific queries, so let's wait a
1439                         * bit.
1440                         */
1441                        ssleep(1);
1442                }
1443                ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETID);
1444                error = synaptics_detect(psmouse, 0);
1445        } while (error && ++retry < 3);
1446
1447        if (error)
1448                return error;
1449
1450        if (retry > 1)
1451                psmouse_dbg(psmouse, "reconnected after %d tries\n", retry);
1452
1453        error = synaptics_query_hardware(psmouse, &info);
1454        if (error) {
1455                psmouse_err(psmouse, "Unable to query device.\n");
1456                return error;
1457        }
1458
1459        error = synaptics_set_mode(psmouse);
1460        if (error) {
1461                psmouse_err(psmouse, "Unable to initialize device.\n");
1462                return error;
1463        }
1464
1465        if (info.identity != priv->info.identity ||
1466            info.model_id != priv->info.model_id ||
1467            info.capabilities != priv->info.capabilities ||
1468            info.ext_cap != priv->info.ext_cap) {
1469                psmouse_err(psmouse,
1470                            "hardware appears to be different: id(%u-%u), model(%u-%u), caps(%x-%x), ext(%x-%x).\n",
1471                            priv->info.identity, info.identity,
1472                            priv->info.model_id, info.model_id,
1473                            priv->info.capabilities, info.capabilities,
1474                            priv->info.ext_cap, info.ext_cap);
1475                return -ENXIO;
1476        }
1477
1478        return 0;
1479}
1480
1481static bool impaired_toshiba_kbc;
1482
1483static const struct dmi_system_id toshiba_dmi_table[] __initconst = {
1484#if defined(CONFIG_DMI) && defined(CONFIG_X86)
1485        {
1486                /* Toshiba Satellite */
1487                .matches = {
1488                        DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1489                        DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
1490                },
1491        },
1492        {
1493                /* Toshiba Dynabook */
1494                .matches = {
1495                        DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1496                        DMI_MATCH(DMI_PRODUCT_NAME, "dynabook"),
1497                },
1498        },
1499        {
1500                /* Toshiba Portege M300 */
1501                .matches = {
1502                        DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1503                        DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE M300"),
1504                },
1505
1506        },
1507        {
1508                /* Toshiba Portege M300 */
1509                .matches = {
1510                        DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1511                        DMI_MATCH(DMI_PRODUCT_NAME, "Portable PC"),
1512                        DMI_MATCH(DMI_PRODUCT_VERSION, "Version 1.0"),
1513                },
1514
1515        },
1516#endif
1517        { }
1518};
1519
1520static bool broken_olpc_ec;
1521
1522static const struct dmi_system_id olpc_dmi_table[] __initconst = {
1523#if defined(CONFIG_DMI) && defined(CONFIG_OLPC)
1524        {
1525                /* OLPC XO-1 or XO-1.5 */
1526                .matches = {
1527                        DMI_MATCH(DMI_SYS_VENDOR, "OLPC"),
1528                        DMI_MATCH(DMI_PRODUCT_NAME, "XO"),
1529                },
1530        },
1531#endif
1532        { }
1533};
1534
1535static const struct dmi_system_id __initconst cr48_dmi_table[] = {
1536#if defined(CONFIG_DMI) && defined(CONFIG_X86)
1537        {
1538                /* Cr-48 Chromebook (Codename Mario) */
1539                .matches = {
1540                        DMI_MATCH(DMI_SYS_VENDOR, "IEC"),
1541                        DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
1542                },
1543        },
1544#endif
1545        { }
1546};
1547
1548void __init synaptics_module_init(void)
1549{
1550        impaired_toshiba_kbc = dmi_check_system(toshiba_dmi_table);
1551        broken_olpc_ec = dmi_check_system(olpc_dmi_table);
1552        cr48_profile_sensor = dmi_check_system(cr48_dmi_table);
1553}
1554
1555static int synaptics_init_ps2(struct psmouse *psmouse,
1556                              struct synaptics_device_info *info,
1557                              bool absolute_mode)
1558{
1559        struct synaptics_data *priv;
1560        int err;
1561
1562        synaptics_apply_quirks(psmouse, info);
1563
1564        psmouse->private = priv = kzalloc(sizeof(struct synaptics_data), GFP_KERNEL);
1565        if (!priv)
1566                return -ENOMEM;
1567
1568        priv->info = *info;
1569        priv->absolute_mode = absolute_mode;
1570        if (SYN_ID_DISGEST_SUPPORTED(info->identity))
1571                priv->disable_gesture = true;
1572
1573        /*
1574         * Unfortunately ForcePad capability is not exported over PS/2,
1575         * so we have to resort to checking PNP IDs.
1576         */
1577        priv->is_forcepad = psmouse_matches_pnp_id(psmouse, forcepad_pnp_ids);
1578
1579        err = synaptics_set_mode(psmouse);
1580        if (err) {
1581                psmouse_err(psmouse, "Unable to initialize device.\n");
1582                goto init_fail;
1583        }
1584
1585        priv->pkt_type = SYN_MODEL_NEWABS(info->model_id) ?
1586                                        SYN_NEWABS : SYN_OLDABS;
1587
1588        psmouse_info(psmouse,
1589                     "Touchpad model: %lu, fw: %lu.%lu, id: %#x, caps: %#x/%#x/%#x/%#x, board id: %u, fw id: %u\n",
1590                     SYN_ID_MODEL(info->identity),
1591                     SYN_ID_MAJOR(info->identity), SYN_ID_MINOR(info->identity),
1592                     info->model_id,
1593                     info->capabilities, info->ext_cap, info->ext_cap_0c,
1594                     info->ext_cap_10, info->board_id, info->firmware_id);
1595
1596        err = set_input_params(psmouse, priv);
1597        if (err) {
1598                psmouse_err(psmouse,
1599                            "failed to set up capabilities: %d\n", err);
1600                goto init_fail;
1601        }
1602
1603        /*
1604         * Encode touchpad model so that it can be used to set
1605         * input device->id.version and be visible to userspace.
1606         * Because version is __u16 we have to drop something.
1607         * Hardware info bits seem to be good candidates as they
1608         * are documented to be for Synaptics corp. internal use.
1609         */
1610        psmouse->model = ((info->model_id & 0x00ff0000) >> 8) |
1611                          (info->model_id & 0x000000ff);
1612
1613        if (absolute_mode) {
1614                psmouse->protocol_handler = synaptics_process_byte;
1615                psmouse->pktsize = 6;
1616        } else {
1617                /* Relative mode follows standard PS/2 mouse protocol */
1618                psmouse->protocol_handler = psmouse_process_byte;
1619                psmouse->pktsize = 3;
1620        }
1621
1622        psmouse->set_rate = synaptics_set_rate;
1623        psmouse->disconnect = synaptics_disconnect;
1624        psmouse->reconnect = synaptics_reconnect;
1625        psmouse->cleanup = synaptics_reset;
1626        /* Synaptics can usually stay in sync without extra help */
1627        psmouse->resync_time = 0;
1628
1629        if (SYN_CAP_PASS_THROUGH(info->capabilities))
1630                synaptics_pt_create(psmouse);
1631
1632        /*
1633         * Toshiba's KBC seems to have trouble handling data from
1634         * Synaptics at full rate.  Switch to a lower rate (roughly
1635         * the same rate as a standard PS/2 mouse).
1636         */
1637        if (psmouse->rate >= 80 && impaired_toshiba_kbc) {
1638                psmouse_info(psmouse,
1639                             "Toshiba %s detected, limiting rate to 40pps.\n",
1640                             dmi_get_system_info(DMI_PRODUCT_NAME));
1641                psmouse->rate = 40;
1642        }
1643
1644        if (!priv->absolute_mode && SYN_ID_DISGEST_SUPPORTED(info->identity)) {
1645                err = device_create_file(&psmouse->ps2dev.serio->dev,
1646                                         &psmouse_attr_disable_gesture.dattr);
1647                if (err) {
1648                        psmouse_err(psmouse,
1649                                    "Failed to create disable_gesture attribute (%d)",
1650                                    err);
1651                        goto init_fail;
1652                }
1653        }
1654
1655        return 0;
1656
1657 init_fail:
1658        kfree(priv);
1659        return err;
1660}
1661
1662static int __synaptics_init(struct psmouse *psmouse, bool absolute_mode)
1663{
1664        struct synaptics_device_info info;
1665        int error;
1666
1667        psmouse_reset(psmouse);
1668
1669        error = synaptics_query_hardware(psmouse, &info);
1670        if (error) {
1671                psmouse_err(psmouse, "Unable to query device: %d\n", error);
1672                return error;
1673        }
1674
1675        return synaptics_init_ps2(psmouse, &info, absolute_mode);
1676}
1677
1678int synaptics_init_absolute(struct psmouse *psmouse)
1679{
1680        return __synaptics_init(psmouse, true);
1681}
1682
1683int synaptics_init_relative(struct psmouse *psmouse)
1684{
1685        return __synaptics_init(psmouse, false);
1686}
1687
1688static int synaptics_setup_ps2(struct psmouse *psmouse,
1689                               struct synaptics_device_info *info)
1690{
1691        bool absolute_mode = true;
1692        int error;
1693
1694        /*
1695         * The OLPC XO has issues with Synaptics' absolute mode; the constant
1696         * packet spew overloads the EC such that key presses on the keyboard
1697         * are missed.  Given that, don't even attempt to use Absolute mode.
1698         * Relative mode seems to work just fine.
1699         */
1700        if (broken_olpc_ec) {
1701                psmouse_info(psmouse,
1702                             "OLPC XO detected, forcing relative protocol.\n");
1703                absolute_mode = false;
1704        }
1705
1706        error = synaptics_init_ps2(psmouse, info, absolute_mode);
1707        if (error)
1708                return error;
1709
1710        return absolute_mode ? PSMOUSE_SYNAPTICS : PSMOUSE_SYNAPTICS_RELATIVE;
1711}
1712
1713#else /* CONFIG_MOUSE_PS2_SYNAPTICS */
1714
1715void __init synaptics_module_init(void)
1716{
1717}
1718
1719static int __maybe_unused
1720synaptics_setup_ps2(struct psmouse *psmouse,
1721                    struct synaptics_device_info *info)
1722{
1723        return -ENOSYS;
1724}
1725
1726#endif /* CONFIG_MOUSE_PS2_SYNAPTICS */
1727
1728#ifdef CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS
1729
1730/*
1731 * The newest Synaptics device can use a secondary bus (called InterTouch) which
1732 * provides a better bandwidth and allow a better control of the touchpads.
1733 * This is used to decide if we need to use this bus or not.
1734 */
1735enum {
1736        SYNAPTICS_INTERTOUCH_NOT_SET = -1,
1737        SYNAPTICS_INTERTOUCH_OFF,
1738        SYNAPTICS_INTERTOUCH_ON,
1739};
1740
1741static int synaptics_intertouch = IS_ENABLED(CONFIG_RMI4_SMB) ?
1742                SYNAPTICS_INTERTOUCH_NOT_SET : SYNAPTICS_INTERTOUCH_OFF;
1743module_param_named(synaptics_intertouch, synaptics_intertouch, int, 0644);
1744MODULE_PARM_DESC(synaptics_intertouch, "Use a secondary bus for the Synaptics device.");
1745
1746static int synaptics_create_intertouch(struct psmouse *psmouse,
1747                                       struct synaptics_device_info *info,
1748                                       bool leave_breadcrumbs)
1749{
1750        bool topbuttonpad =
1751                psmouse_matches_pnp_id(psmouse, topbuttonpad_pnp_ids) &&
1752                !SYN_CAP_EXT_BUTTONS_STICK(info->ext_cap_10);
1753        const struct rmi_device_platform_data pdata = {
1754                .sensor_pdata = {
1755                        .sensor_type = rmi_sensor_touchpad,
1756                        .axis_align.flip_y = true,
1757                        .kernel_tracking = false,
1758                        .topbuttonpad = topbuttonpad,
1759                },
1760                .gpio_data = {
1761                        .buttonpad = SYN_CAP_CLICKPAD(info->ext_cap_0c),
1762                        .trackstick_buttons =
1763                                !!SYN_CAP_EXT_BUTTONS_STICK(info->ext_cap_10),
1764                },
1765        };
1766        const struct i2c_board_info intertouch_board = {
1767                I2C_BOARD_INFO("rmi4_smbus", 0x2c),
1768                .flags = I2C_CLIENT_HOST_NOTIFY,
1769        };
1770
1771        return psmouse_smbus_init(psmouse, &intertouch_board,
1772                                  &pdata, sizeof(pdata), true,
1773                                  leave_breadcrumbs);
1774}
1775
1776/*
1777 * synaptics_setup_intertouch - called once the PS/2 devices are enumerated
1778 * and decides to instantiate a SMBus InterTouch device.
1779 */
1780static int synaptics_setup_intertouch(struct psmouse *psmouse,
1781                                      struct synaptics_device_info *info,
1782                                      bool leave_breadcrumbs)
1783{
1784        int error;
1785
1786        if (synaptics_intertouch == SYNAPTICS_INTERTOUCH_OFF)
1787                return -ENXIO;
1788
1789        if (synaptics_intertouch == SYNAPTICS_INTERTOUCH_NOT_SET) {
1790                if (!psmouse_matches_pnp_id(psmouse, topbuttonpad_pnp_ids) &&
1791                    !psmouse_matches_pnp_id(psmouse, smbus_pnp_ids)) {
1792
1793                        if (!psmouse_matches_pnp_id(psmouse, forcepad_pnp_ids))
1794                                psmouse_info(psmouse,
1795                                             "Your touchpad (%s) says it can support a different bus. "
1796                                             "If i2c-hid and hid-rmi are not used, you might want to try setting psmouse.synaptics_intertouch to 1 and report this to linux-input@vger.kernel.org.\n",
1797                                             psmouse->ps2dev.serio->firmware_id);
1798
1799                        return -ENXIO;
1800                }
1801        }
1802
1803        psmouse_info(psmouse, "Trying to set up SMBus access\n");
1804
1805        error = synaptics_create_intertouch(psmouse, info, leave_breadcrumbs);
1806        if (error) {
1807                if (error == -EAGAIN)
1808                        psmouse_info(psmouse, "SMbus companion is not ready yet\n");
1809                else
1810                        psmouse_err(psmouse, "unable to create intertouch device\n");
1811
1812                return error;
1813        }
1814
1815        return 0;
1816}
1817
1818int synaptics_init_smbus(struct psmouse *psmouse)
1819{
1820        struct synaptics_device_info info;
1821        int error;
1822
1823        psmouse_reset(psmouse);
1824
1825        error = synaptics_query_hardware(psmouse, &info);
1826        if (error) {
1827                psmouse_err(psmouse, "Unable to query device: %d\n", error);
1828                return error;
1829        }
1830
1831        if (!SYN_CAP_INTERTOUCH(info.ext_cap_0c))
1832                return -ENXIO;
1833
1834        return synaptics_create_intertouch(psmouse, &info, false);
1835}
1836
1837#else /* CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
1838
1839static int __maybe_unused
1840synaptics_setup_intertouch(struct psmouse *psmouse,
1841                           struct synaptics_device_info *info,
1842                           bool leave_breadcrumbs)
1843{
1844        return -ENOSYS;
1845}
1846
1847int synaptics_init_smbus(struct psmouse *psmouse)
1848{
1849        return -ENOSYS;
1850}
1851
1852#endif /* CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
1853
1854#if defined(CONFIG_MOUSE_PS2_SYNAPTICS) || \
1855    defined(CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS)
1856
1857int synaptics_init(struct psmouse *psmouse)
1858{
1859        struct synaptics_device_info info;
1860        int error;
1861        int retval;
1862
1863        psmouse_reset(psmouse);
1864
1865        error = synaptics_query_hardware(psmouse, &info);
1866        if (error) {
1867                psmouse_err(psmouse, "Unable to query device: %d\n", error);
1868                return error;
1869        }
1870
1871        if (SYN_CAP_INTERTOUCH(info.ext_cap_0c)) {
1872                if ((!IS_ENABLED(CONFIG_RMI4_SMB) ||
1873                     !IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS)) &&
1874                    /* Forcepads need F21, which is not ready */
1875                    !psmouse_matches_pnp_id(psmouse, forcepad_pnp_ids)) {
1876                        psmouse_warn(psmouse,
1877                                     "The touchpad can support a better bus than the too old PS/2 protocol. "
1878                                     "Make sure MOUSE_PS2_SYNAPTICS_SMBUS and RMI4_SMB are enabled to get a better touchpad experience.\n");
1879                }
1880
1881                error = synaptics_setup_intertouch(psmouse, &info, true);
1882                if (!error)
1883                        return PSMOUSE_SYNAPTICS_SMBUS;
1884        }
1885
1886        retval = synaptics_setup_ps2(psmouse, &info);
1887        if (retval < 0) {
1888                /*
1889                 * Not using any flavor of Synaptics support, so clean up
1890                 * SMbus breadcrumbs, if any.
1891                 */
1892                psmouse_smbus_cleanup(psmouse);
1893        }
1894
1895        return retval;
1896}
1897
1898#else /* CONFIG_MOUSE_PS2_SYNAPTICS || CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
1899
1900int synaptics_init(struct psmouse *psmouse)
1901{
1902        return -ENOSYS;
1903}
1904
1905#endif /* CONFIG_MOUSE_PS2_SYNAPTICS || CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
1906
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