drivers/input/mouse/synaptics.c

   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  */
  79 static 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
  96 int 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
 118 void 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. */
 128 static 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
 164 static 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 1st */
 183         "LEN009b", /* T580 */
 184         "LEN200f", /* T450s */
 185         "LEN2044", /* L470  */
 186         "LEN2054", /* E480 */
 187         "LEN2055", /* E580 */
 188         "SYN3052", /* HP EliteBook 840 G4 */
 189         "SYN3221", /* HP 15-ay000 */
 190         "SYN323d", /* HP Spectre X360 13-w013dx */
 191         "SYN3257", /* HP Envy 13-ad105ng */
 192         NULL
 193 };
 194
 195 static const char * const forcepad_pnp_ids[] = {
 196         "SYN300D",
 197         "SYN3014",
 198         NULL
 199 };
 200
 201 /*
 202  * Send a command to the synaptics touchpad by special commands
 203  */
 204 static int synaptics_send_cmd(struct psmouse *psmouse, u8 cmd, u8 *param)
 205 {
 206         int error;
 207
 208         error = ps2_sliced_command(&psmouse->ps2dev, cmd);
 209         if (error)
 210                 return error;
 211
 212         error = ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO);
 213         if (error)
 214                 return error;
 215
 216         return 0;
 217 }
 218
 219 static int synaptics_query_int(struct psmouse *psmouse, u8 query_cmd, u32 *val)
 220 {
 221         int error;
 222         union {
 223                 __be32 be_val;
 224                 char buf[4];
 225         } resp = { 0 };
 226
 227         error = synaptics_send_cmd(psmouse, query_cmd, resp.buf + 1);
 228         if (error)
 229                 return error;
 230
 231         *val = be32_to_cpu(resp.be_val);
 232         return 0;
 233 }
 234
 235 /*
 236  * Identify Touchpad
 237  * See also the SYN_ID_* macros
 238  */
 239 static int synaptics_identify(struct psmouse *psmouse,
 240                               struct synaptics_device_info *info)
 241 {
 242         int error;
 243
 244         error = synaptics_query_int(psmouse, SYN_QUE_IDENTIFY, &info->identity);
 245         if (error)
 246                 return error;
 247
 248         return SYN_ID_IS_SYNAPTICS(info->identity) ? 0 : -ENXIO;
 249 }
 250
 251 /*
 252  * Read the model-id bytes from the touchpad
 253  * see also SYN_MODEL_* macros
 254  */
 255 static int synaptics_model_id(struct psmouse *psmouse,
 256                               struct synaptics_device_info *info)
 257 {
 258         return synaptics_query_int(psmouse, SYN_QUE_MODEL, &info->model_id);
 259 }
 260
 261 /*
 262  * Read the firmware id from the touchpad
 263  */
 264 static int synaptics_firmware_id(struct psmouse *psmouse,
 265                                  struct synaptics_device_info *info)
 266 {
 267         return synaptics_query_int(psmouse, SYN_QUE_FIRMWARE_ID,
 268                                    &info->firmware_id);
 269 }
 270
 271 /*
 272  * Read the board id and the "More Extended Queries" from the touchpad
 273  * The board id is encoded in the "QUERY MODES" response
 274  */
 275 static int synaptics_query_modes(struct psmouse *psmouse,
 276                                  struct synaptics_device_info *info)
 277 {
 278         u8 bid[3];
 279         int error;
 280
 281         /* firmwares prior 7.5 have no board_id encoded */
 282         if (SYN_ID_FULL(info->identity) < 0x705)
 283                 return 0;
 284
 285         error = synaptics_send_cmd(psmouse, SYN_QUE_MODES, bid);
 286         if (error)
 287                 return error;
 288
 289         info->board_id = ((bid[0] & 0xfc) << 6) | bid[1];
 290
 291         if (SYN_MEXT_CAP_BIT(bid[0]))
 292                 return synaptics_query_int(psmouse, SYN_QUE_MEXT_CAPAB_10,
 293                                            &info->ext_cap_10);
 294
 295         return 0;
 296 }
 297
 298 /*
 299  * Read the capability-bits from the touchpad
 300  * see also the SYN_CAP_* macros
 301  */
 302 static int synaptics_capability(struct psmouse *psmouse,
 303                                 struct synaptics_device_info *info)
 304 {
 305         int error;
 306
 307         error = synaptics_query_int(psmouse, SYN_QUE_CAPABILITIES,
 308                                     &info->capabilities);
 309         if (error)
 310                 return error;
 311
 312         info->ext_cap = info->ext_cap_0c = 0;
 313
 314         /*
 315          * Older firmwares had submodel ID fixed to 0x47
 316          */
 317         if (SYN_ID_FULL(info->identity) < 0x705 &&
 318             SYN_CAP_SUBMODEL_ID(info->capabilities) != 0x47) {
 319                 return -ENXIO;
 320         }
 321
 322         /*
 323          * Unless capExtended is set the rest of the flags should be ignored
 324          */
 325         if (!SYN_CAP_EXTENDED(info->capabilities))
 326                 info->capabilities = 0;
 327
 328         if (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 1) {
 329                 error = synaptics_query_int(psmouse, SYN_QUE_EXT_CAPAB,
 330                                             &info->ext_cap);
 331                 if (error) {
 332                         psmouse_warn(psmouse,
 333                                      "device claims to have extended capabilities, but I'm not able to read them.\n");
 334                 } else {
 335                         /*
 336                          * if nExtBtn is greater than 8 it should be considered
 337                          * invalid and treated as 0
 338                          */
 339                         if (SYN_CAP_MULTI_BUTTON_NO(info->ext_cap) > 8)
 340                                 info->ext_cap &= ~SYN_CAP_MB_MASK;
 341                 }
 342         }
 343
 344         if (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 4) {
 345                 error = synaptics_query_int(psmouse, SYN_QUE_EXT_CAPAB_0C,
 346                                             &info->ext_cap_0c);
 347                 if (error)
 348                         psmouse_warn(psmouse,
 349                                      "device claims to have extended capability 0x0c, but I'm not able to read it.\n");
 350         }
 351
 352         return 0;
 353 }
 354
 355 /*
 356  * Read touchpad resolution and maximum reported coordinates
 357  * Resolution is left zero if touchpad does not support the query
 358  */
 359 static int synaptics_resolution(struct psmouse *psmouse,
 360                                 struct synaptics_device_info *info)
 361 {
 362         u8 resp[3];
 363         int error;
 364
 365         if (SYN_ID_MAJOR(info->identity) < 4)
 366                 return 0;
 367
 368         error = synaptics_send_cmd(psmouse, SYN_QUE_RESOLUTION, resp);
 369         if (!error) {
 370                 if (resp[0] != 0 && (resp[1] & 0x80) && resp[2] != 0) {
 371                         info->x_res = resp[0]; /* x resolution in units/mm */
 372                         info->y_res = resp[2]; /* y resolution in units/mm */
 373                 }
 374         }
 375
 376         if (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 5 &&
 377             SYN_CAP_MAX_DIMENSIONS(info->ext_cap_0c)) {
 378                 error = synaptics_send_cmd(psmouse,
 379                                            SYN_QUE_EXT_MAX_COORDS, resp);
 380                 if (error) {
 381                         psmouse_warn(psmouse,
 382                                      "device claims to have max coordinates query, but I'm not able to read it.\n");
 383                 } else {
 384                         info->x_max = (resp[0] << 5) | ((resp[1] & 0x0f) << 1);
 385                         info->y_max = (resp[2] << 5) | ((resp[1] & 0xf0) >> 3);
 386                         psmouse_info(psmouse,
 387                                      "queried max coordinates: x [..%d], y [..%d]\n",
 388                                      info->x_max, info->y_max);
 389                 }
 390         }
 391
 392         if (SYN_CAP_MIN_DIMENSIONS(info->ext_cap_0c) &&
 393             (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 7 ||
 394              /*
 395               * Firmware v8.1 does not report proper number of extended
 396               * capabilities, but has been proven to report correct min
 397               * coordinates.
 398               */
 399              SYN_ID_FULL(info->identity) == 0x801)) {
 400                 error = synaptics_send_cmd(psmouse,
 401                                            SYN_QUE_EXT_MIN_COORDS, resp);
 402                 if (error) {
 403                         psmouse_warn(psmouse,
 404                                      "device claims to have min coordinates query, but I'm not able to read it.\n");
 405                 } else {
 406                         info->x_min = (resp[0] << 5) | ((resp[1] & 0x0f) << 1);
 407                         info->y_min = (resp[2] << 5) | ((resp[1] & 0xf0) >> 3);
 408                         psmouse_info(psmouse,
 409                                      "queried min coordinates: x [%d..], y [%d..]\n",
 410                                      info->x_min, info->y_min);
 411                 }
 412         }
 413
 414         return 0;
 415 }
 416
 417 static int synaptics_query_hardware(struct psmouse *psmouse,
 418                                     struct synaptics_device_info *info)
 419 {
 420         int error;
 421
 422         memset(info, 0, sizeof(*info));
 423
 424         error = synaptics_identify(psmouse, info);
 425         if (error)
 426                 return error;
 427
 428         error = synaptics_model_id(psmouse, info);
 429         if (error)
 430                 return error;
 431
 432         error = synaptics_firmware_id(psmouse, info);
 433         if (error)
 434                 return error;
 435
 436         error = synaptics_query_modes(psmouse, info);
 437         if (error)
 438                 return error;
 439
 440         error = synaptics_capability(psmouse, info);
 441         if (error)
 442                 return error;
 443
 444         error = synaptics_resolution(psmouse, info);
 445         if (error)
 446                 return error;
 447
 448         return 0;
 449 }
 450
 451 #endif /* CONFIG_MOUSE_PS2_SYNAPTICS || CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
 452
 453 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS
 454
 455 static bool cr48_profile_sensor;
 456
 457 #define ANY_BOARD_ID 0
 458 struct min_max_quirk {
 459         const char * const *pnp_ids;
 460         struct {
 461                 u32 min, max;
 462         } board_id;
 463         u32 x_min, x_max, y_min, y_max;
 464 };
 465
 466 static const struct min_max_quirk min_max_pnpid_table[] = {
 467         {
 468                 (const char * const []){"LEN0033", NULL},
 469                 {ANY_BOARD_ID, ANY_BOARD_ID},
 470                 1024, 5052, 2258, 4832
 471         },
 472         {
 473                 (const char * const []){"LEN0042", NULL},
 474                 {ANY_BOARD_ID, ANY_BOARD_ID},
 475                 1232, 5710, 1156, 4696
 476         },
 477         {
 478                 (const char * const []){"LEN0034", "LEN0036", "LEN0037",
 479                                         "LEN0039", "LEN2002", "LEN2004",
 480                                         NULL},
 481                 {ANY_BOARD_ID, 2961},
 482                 1024, 5112, 2024, 4832
 483         },
 484         {
 485                 (const char * const []){"LEN2000", NULL},
 486                 {ANY_BOARD_ID, ANY_BOARD_ID},
 487                 1024, 5113, 2021, 4832
 488         },
 489         {
 490                 (const char * const []){"LEN2001", NULL},
 491                 {ANY_BOARD_ID, ANY_BOARD_ID},
 492                 1024, 5022, 2508, 4832
 493         },
 494         {
 495                 (const char * const []){"LEN2006", NULL},
 496                 {2691, 2691},
 497                 1024, 5045, 2457, 4832
 498         },
 499         {
 500                 (const char * const []){"LEN2006", NULL},
 501                 {ANY_BOARD_ID, ANY_BOARD_ID},
 502                 1264, 5675, 1171, 4688
 503         },
 504         { }
 505 };
 506
 507 /*****************************************************************************
 508  *      Synaptics communications functions
 509  ****************************************************************************/
 510
 511 /*
 512  * Synaptics touchpads report the y coordinate from bottom to top, which is
 513  * opposite from what userspace expects.
 514  * This function is used to invert y before reporting.
 515  */
 516 static int synaptics_invert_y(int y)
 517 {
 518         return YMAX_NOMINAL + YMIN_NOMINAL - y;
 519 }
 520
 521 /*
 522  * Apply quirk(s) if the hardware matches
 523  */
 524 static void synaptics_apply_quirks(struct psmouse *psmouse,
 525                                    struct synaptics_device_info *info)
 526 {
 527         int i;
 528
 529         for (i = 0; min_max_pnpid_table[i].pnp_ids; i++) {
 530                 if (!psmouse_matches_pnp_id(psmouse,
 531                                             min_max_pnpid_table[i].pnp_ids))
 532                         continue;
 533
 534                 if (min_max_pnpid_table[i].board_id.min != ANY_BOARD_ID &&
 535                     info->board_id < min_max_pnpid_table[i].board_id.min)
 536                         continue;
 537
 538                 if (min_max_pnpid_table[i].board_id.max != ANY_BOARD_ID &&
 539                     info->board_id > min_max_pnpid_table[i].board_id.max)
 540                         continue;
 541
 542                 info->x_min = min_max_pnpid_table[i].x_min;
 543                 info->x_max = min_max_pnpid_table[i].x_max;
 544                 info->y_min = min_max_pnpid_table[i].y_min;
 545                 info->y_max = min_max_pnpid_table[i].y_max;
 546                 psmouse_info(psmouse,
 547                              "quirked min/max coordinates: x [%d..%d], y [%d..%d]\n",
 548                              info->x_min, info->x_max,
 549                              info->y_min, info->y_max);
 550                 break;
 551         }
 552 }
 553
 554 static bool synaptics_has_agm(struct synaptics_data *priv)
 555 {
 556         return (SYN_CAP_ADV_GESTURE(priv->info.ext_cap_0c) ||
 557                 SYN_CAP_IMAGE_SENSOR(priv->info.ext_cap_0c));
 558 }
 559
 560 static int synaptics_set_advanced_gesture_mode(struct psmouse *psmouse)
 561 {
 562         static u8 param = 0xc8;
 563         int error;
 564
 565         error = ps2_sliced_command(&psmouse->ps2dev, SYN_QUE_MODEL);
 566         if (error)
 567                 return error;
 568
 569         error = ps2_command(&psmouse->ps2dev, &param, PSMOUSE_CMD_SETRATE);
 570         if (error)
 571                 return error;
 572
 573         return 0;
 574 }
 575
 576 static int synaptics_set_mode(struct psmouse *psmouse)
 577 {
 578         struct synaptics_data *priv = psmouse->private;
 579         int error;
 580
 581         priv->mode = 0;
 582         if (priv->absolute_mode)
 583                 priv->mode |= SYN_BIT_ABSOLUTE_MODE;
 584         if (priv->disable_gesture)
 585                 priv->mode |= SYN_BIT_DISABLE_GESTURE;
 586         if (psmouse->rate >= 80)
 587                 priv->mode |= SYN_BIT_HIGH_RATE;
 588         if (SYN_CAP_EXTENDED(priv->info.capabilities))
 589                 priv->mode |= SYN_BIT_W_MODE;
 590
 591         error = synaptics_mode_cmd(psmouse, priv->mode);
 592         if (error)
 593                 return error;
 594
 595         if (priv->absolute_mode && synaptics_has_agm(priv)) {
 596                 error = synaptics_set_advanced_gesture_mode(psmouse);
 597                 if (error) {
 598                         psmouse_err(psmouse,
 599                                     "Advanced gesture mode init failed: %d\n",
 600                                     error);
 601                         return error;
 602                 }
 603         }
 604
 605         return 0;
 606 }
 607
 608 static void synaptics_set_rate(struct psmouse *psmouse, unsigned int rate)
 609 {
 610         struct synaptics_data *priv = psmouse->private;
 611
 612         if (rate >= 80) {
 613                 priv->mode |= SYN_BIT_HIGH_RATE;
 614                 psmouse->rate = 80;
 615         } else {
 616                 priv->mode &= ~SYN_BIT_HIGH_RATE;
 617                 psmouse->rate = 40;
 618         }
 619
 620         synaptics_mode_cmd(psmouse, priv->mode);
 621 }
 622
 623 /*****************************************************************************
 624  *      Synaptics pass-through PS/2 port support
 625  ****************************************************************************/
 626 static int synaptics_pt_write(struct serio *serio, u8 c)
 627 {
 628         struct psmouse *parent = serio_get_drvdata(serio->parent);
 629         u8 rate_param = SYN_PS_CLIENT_CMD; /* indicates that we want pass-through port */
 630         int error;
 631
 632         error = ps2_sliced_command(&parent->ps2dev, c);
 633         if (error)
 634                 return error;
 635
 636         error = ps2_command(&parent->ps2dev, &rate_param, PSMOUSE_CMD_SETRATE);
 637         if (error)
 638                 return error;
 639
 640         return 0;
 641 }
 642
 643 static int synaptics_pt_start(struct serio *serio)
 644 {
 645         struct psmouse *parent = serio_get_drvdata(serio->parent);
 646         struct synaptics_data *priv = parent->private;
 647
 648         serio_pause_rx(parent->ps2dev.serio);
 649         priv->pt_port = serio;
 650         serio_continue_rx(parent->ps2dev.serio);
 651
 652         return 0;
 653 }
 654
 655 static void synaptics_pt_stop(struct serio *serio)
 656 {
 657         struct psmouse *parent = serio_get_drvdata(serio->parent);
 658         struct synaptics_data *priv = parent->private;
 659
 660         serio_pause_rx(parent->ps2dev.serio);
 661         priv->pt_port = NULL;
 662         serio_continue_rx(parent->ps2dev.serio);
 663 }
 664
 665 static int synaptics_is_pt_packet(u8 *buf)
 666 {
 667         return (buf[0] & 0xFC) == 0x84 && (buf[3] & 0xCC) == 0xC4;
 668 }
 669
 670 static void synaptics_pass_pt_packet(struct serio *ptport, u8 *packet)
 671 {
 672         struct psmouse *child = serio_get_drvdata(ptport);
 673
 674         if (child && child->state == PSMOUSE_ACTIVATED) {
 675                 serio_interrupt(ptport, packet[1], 0);
 676                 serio_interrupt(ptport, packet[4], 0);
 677                 serio_interrupt(ptport, packet[5], 0);
 678                 if (child->pktsize == 4)
 679                         serio_interrupt(ptport, packet[2], 0);
 680         } else {
 681                 serio_interrupt(ptport, packet[1], 0);
 682         }
 683 }
 684
 685 static void synaptics_pt_activate(struct psmouse *psmouse)
 686 {
 687         struct synaptics_data *priv = psmouse->private;
 688         struct psmouse *child = serio_get_drvdata(priv->pt_port);
 689
 690         /* adjust the touchpad to child's choice of protocol */
 691         if (child) {
 692                 if (child->pktsize == 4)
 693                         priv->mode |= SYN_BIT_FOUR_BYTE_CLIENT;
 694                 else
 695                         priv->mode &= ~SYN_BIT_FOUR_BYTE_CLIENT;
 696
 697                 if (synaptics_mode_cmd(psmouse, priv->mode))
 698                         psmouse_warn(psmouse,
 699                                      "failed to switch guest protocol\n");
 700         }
 701 }
 702
 703 static void synaptics_pt_create(struct psmouse *psmouse)
 704 {
 705         struct serio *serio;
 706
 707         serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
 708         if (!serio) {
 709                 psmouse_err(psmouse,
 710                             "not enough memory for pass-through port\n");
 711                 return;
 712         }
 713
 714         serio->id.type = SERIO_PS_PSTHRU;
 715         strlcpy(serio->name, "Synaptics pass-through", sizeof(serio->name));
 716         strlcpy(serio->phys, "synaptics-pt/serio0", sizeof(serio->phys));
 717         serio->write = synaptics_pt_write;
 718         serio->start = synaptics_pt_start;
 719         serio->stop = synaptics_pt_stop;
 720         serio->parent = psmouse->ps2dev.serio;
 721
 722         psmouse->pt_activate = synaptics_pt_activate;
 723
 724         psmouse_info(psmouse, "serio: %s port at %s\n",
 725                      serio->name, psmouse->phys);
 726         serio_register_port(serio);
 727 }
 728
 729 /*****************************************************************************
 730  *      Functions to interpret the absolute mode packets
 731  ****************************************************************************/
 732
 733 static void synaptics_parse_agm(const u8 buf[],
 734                                 struct synaptics_data *priv,
 735                                 struct synaptics_hw_state *hw)
 736 {
 737         struct synaptics_hw_state *agm = &priv->agm;
 738         int agm_packet_type;
 739
 740         agm_packet_type = (buf[5] & 0x30) >> 4;
 741         switch (agm_packet_type) {
 742         case 1:
 743                 /* Gesture packet: (x, y, z) half resolution */
 744                 agm->w = hw->w;
 745                 agm->x = (((buf[4] & 0x0f) << 8) | buf[1]) << 1;
 746                 agm->y = (((buf[4] & 0xf0) << 4) | buf[2]) << 1;
 747                 agm->z = ((buf[3] & 0x30) | (buf[5] & 0x0f)) << 1;
 748                 break;
 749
 750         case 2:
 751                 /* AGM-CONTACT packet: we are only interested in the count */
 752                 priv->agm_count = buf[1];
 753                 break;
 754
 755         default:
 756                 break;
 757         }
 758 }
 759
 760 static void synaptics_parse_ext_buttons(const u8 buf[],
 761                                         struct synaptics_data *priv,
 762                                         struct synaptics_hw_state *hw)
 763 {
 764         unsigned int ext_bits =
 765                 (SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap) + 1) >> 1;
 766         unsigned int ext_mask = GENMASK(ext_bits - 1, 0);
 767
 768         hw->ext_buttons = buf[4] & ext_mask;
 769         hw->ext_buttons |= (buf[5] & ext_mask) << ext_bits;
 770 }
 771
 772 static int synaptics_parse_hw_state(const u8 buf[],
 773                                     struct synaptics_data *priv,
 774                                     struct synaptics_hw_state *hw)
 775 {
 776         memset(hw, 0, sizeof(struct synaptics_hw_state));
 777
 778         if (SYN_MODEL_NEWABS(priv->info.model_id)) {
 779                 hw->w = (((buf[0] & 0x30) >> 2) |
 780                          ((buf[0] & 0x04) >> 1) |
 781                          ((buf[3] & 0x04) >> 2));
 782
 783                 if (synaptics_has_agm(priv) && hw->w == 2) {
 784                         synaptics_parse_agm(buf, priv, hw);
 785                         return 1;
 786                 }
 787
 788                 hw->x = (((buf[3] & 0x10) << 8) |
 789                          ((buf[1] & 0x0f) << 8) |
 790                          buf[4]);
 791                 hw->y = (((buf[3] & 0x20) << 7) |
 792                          ((buf[1] & 0xf0) << 4) |
 793                          buf[5]);
 794                 hw->z = buf[2];
 795
 796                 hw->left  = (buf[0] & 0x01) ? 1 : 0;
 797                 hw->right = (buf[0] & 0x02) ? 1 : 0;
 798
 799                 if (priv->is_forcepad) {
 800                         /*
 801                          * ForcePads, like Clickpads, use middle button
 802                          * bits to report primary button clicks.
 803                          * Unfortunately they report primary button not
 804                          * only when user presses on the pad above certain
 805                          * threshold, but also when there are more than one
 806                          * finger on the touchpad, which interferes with
 807                          * out multi-finger gestures.
 808                          */
 809                         if (hw->z == 0) {
 810                                 /* No contacts */
 811                                 priv->press = priv->report_press = false;
 812                         } else if (hw->w >= 4 && ((buf[0] ^ buf[3]) & 0x01)) {
 813                                 /*
 814                                  * Single-finger touch with pressure above
 815                                  * the threshold. If pressure stays long
 816                                  * enough, we'll start reporting primary
 817                                  * button. We rely on the device continuing
 818                                  * sending data even if finger does not
 819                                  * move.
 820                                  */
 821                                 if  (!priv->press) {
 822                                         priv->press_start = jiffies;
 823                                         priv->press = true;
 824                                 } else if (time_after(jiffies,
 825                                                 priv->press_start +
 826                                                         msecs_to_jiffies(50))) {
 827                                         priv->report_press = true;
 828                                 }
 829                         } else {
 830                                 priv->press = false;
 831                         }
 832
 833                         hw->left = priv->report_press;
 834
 835                 } else if (SYN_CAP_CLICKPAD(priv->info.ext_cap_0c)) {
 836                         /*
 837                          * Clickpad's button is transmitted as middle button,
 838                          * however, since it is primary button, we will report
 839                          * it as BTN_LEFT.
 840                          */
 841                         hw->left = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
 842
 843                 } else if (SYN_CAP_MIDDLE_BUTTON(priv->info.capabilities)) {
 844                         hw->middle = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
 845                         if (hw->w == 2)
 846                                 hw->scroll = (s8)buf[1];
 847                 }
 848
 849                 if (SYN_CAP_FOUR_BUTTON(priv->info.capabilities)) {
 850                         hw->up   = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
 851                         hw->down = ((buf[0] ^ buf[3]) & 0x02) ? 1 : 0;
 852                 }
 853
 854                 if (SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap) > 0 &&
 855                     ((buf[0] ^ buf[3]) & 0x02)) {
 856                         synaptics_parse_ext_buttons(buf, priv, hw);
 857                 }
 858         } else {
 859                 hw->x = (((buf[1] & 0x1f) << 8) | buf[2]);
 860                 hw->y = (((buf[4] & 0x1f) << 8) | buf[5]);
 861
 862                 hw->z = (((buf[0] & 0x30) << 2) | (buf[3] & 0x3F));
 863                 hw->w = (((buf[1] & 0x80) >> 4) | ((buf[0] & 0x04) >> 1));
 864
 865                 hw->left  = (buf[0] & 0x01) ? 1 : 0;
 866                 hw->right = (buf[0] & 0x02) ? 1 : 0;
 867         }
 868
 869         /*
 870          * Convert wrap-around values to negative. (X|Y)_MAX_POSITIVE
 871          * is used by some firmware to indicate a finger at the edge of
 872          * the touchpad whose precise position cannot be determined, so
 873          * convert these values to the maximum axis value.
 874          */
 875         if (hw->x > X_MAX_POSITIVE)
 876                 hw->x -= 1 << ABS_POS_BITS;
 877         else if (hw->x == X_MAX_POSITIVE)
 878                 hw->x = XMAX;
 879
 880         if (hw->y > Y_MAX_POSITIVE)
 881                 hw->y -= 1 << ABS_POS_BITS;
 882         else if (hw->y == Y_MAX_POSITIVE)
 883                 hw->y = YMAX;
 884
 885         return 0;
 886 }
 887
 888 static void synaptics_report_semi_mt_slot(struct input_dev *dev, int slot,
 889                                           bool active, int x, int y)
 890 {
 891         input_mt_slot(dev, slot);
 892         input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
 893         if (active) {
 894                 input_report_abs(dev, ABS_MT_POSITION_X, x);
 895                 input_report_abs(dev, ABS_MT_POSITION_Y, synaptics_invert_y(y));
 896         }
 897 }
 898
 899 static void synaptics_report_semi_mt_data(struct input_dev *dev,
 900                                           const struct synaptics_hw_state *a,
 901                                           const struct synaptics_hw_state *b,
 902                                           int num_fingers)
 903 {
 904         if (num_fingers >= 2) {
 905                 synaptics_report_semi_mt_slot(dev, 0, true, min(a->x, b->x),
 906                                               min(a->y, b->y));
 907                 synaptics_report_semi_mt_slot(dev, 1, true, max(a->x, b->x),
 908                                               max(a->y, b->y));
 909         } else if (num_fingers == 1) {
 910                 synaptics_report_semi_mt_slot(dev, 0, true, a->x, a->y);
 911                 synaptics_report_semi_mt_slot(dev, 1, false, 0, 0);
 912         } else {
 913                 synaptics_report_semi_mt_slot(dev, 0, false, 0, 0);
 914                 synaptics_report_semi_mt_slot(dev, 1, false, 0, 0);
 915         }
 916 }
 917
 918 static void synaptics_report_ext_buttons(struct psmouse *psmouse,
 919                                          const struct synaptics_hw_state *hw)
 920 {
 921         struct input_dev *dev = psmouse->dev;
 922         struct synaptics_data *priv = psmouse->private;
 923         int ext_bits = (SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap) + 1) >> 1;
 924         int i;
 925
 926         if (!SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap))
 927                 return;
 928
 929         /* Bug in FW 8.1 & 8.2, buttons are reported only when ExtBit is 1 */
 930         if ((SYN_ID_FULL(priv->info.identity) == 0x801 ||
 931              SYN_ID_FULL(priv->info.identity) == 0x802) &&
 932             !((psmouse->packet[0] ^ psmouse->packet[3]) & 0x02))
 933                 return;
 934
 935         if (!SYN_CAP_EXT_BUTTONS_STICK(priv->info.ext_cap_10)) {
 936                 for (i = 0; i < ext_bits; i++) {
 937                         input_report_key(dev, BTN_0 + 2 * i,
 938                                 hw->ext_buttons & BIT(i));
 939                         input_report_key(dev, BTN_1 + 2 * i,
 940                                 hw->ext_buttons & BIT(i + ext_bits));
 941                 }
 942                 return;
 943         }
 944
 945         /*
 946          * This generation of touchpads has the trackstick buttons
 947          * physically wired to the touchpad. Re-route them through
 948          * the pass-through interface.
 949          */
 950         if (priv->pt_port) {
 951                 u8 pt_buttons;
 952
 953                 /* The trackstick expects at most 3 buttons */
 954                 pt_buttons = SYN_EXT_BUTTON_STICK_L(hw->ext_buttons)      |
 955                              SYN_EXT_BUTTON_STICK_R(hw->ext_buttons) << 1 |
 956                              SYN_EXT_BUTTON_STICK_M(hw->ext_buttons) << 2;
 957
 958                 serio_interrupt(priv->pt_port,
 959                                 PSMOUSE_OOB_EXTRA_BTNS, SERIO_OOB_DATA);
 960                 serio_interrupt(priv->pt_port, pt_buttons, SERIO_OOB_DATA);
 961         }
 962 }
 963
 964 static void synaptics_report_buttons(struct psmouse *psmouse,
 965                                      const struct synaptics_hw_state *hw)
 966 {
 967         struct input_dev *dev = psmouse->dev;
 968         struct synaptics_data *priv = psmouse->private;
 969
 970         input_report_key(dev, BTN_LEFT, hw->left);
 971         input_report_key(dev, BTN_RIGHT, hw->right);
 972
 973         if (SYN_CAP_MIDDLE_BUTTON(priv->info.capabilities))
 974                 input_report_key(dev, BTN_MIDDLE, hw->middle);
 975
 976         if (SYN_CAP_FOUR_BUTTON(priv->info.capabilities)) {
 977                 input_report_key(dev, BTN_FORWARD, hw->up);
 978                 input_report_key(dev, BTN_BACK, hw->down);
 979         }
 980
 981         synaptics_report_ext_buttons(psmouse, hw);
 982 }
 983
 984 static void synaptics_report_mt_data(struct psmouse *psmouse,
 985                                      const struct synaptics_hw_state *sgm,
 986                                      int num_fingers)
 987 {
 988         struct input_dev *dev = psmouse->dev;
 989         struct synaptics_data *priv = psmouse->private;
 990         const struct synaptics_hw_state *hw[2] = { sgm, &priv->agm };
 991         struct input_mt_pos pos[2];
 992         int slot[2], nsemi, i;
 993
 994         nsemi = clamp_val(num_fingers, 0, 2);
 995
 996         for (i = 0; i < nsemi; i++) {
 997                 pos[i].x = hw[i]->x;
 998                 pos[i].y = synaptics_invert_y(hw[i]->y);
 999         }
1000
1001         input_mt_assign_slots(dev, slot, pos, nsemi, DMAX * priv->info.x_res);
1002
1003         for (i = 0; i < nsemi; i++) {
1004                 input_mt_slot(dev, slot[i]);
1005                 input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
1006                 input_report_abs(dev, ABS_MT_POSITION_X, pos[i].x);
1007                 input_report_abs(dev, ABS_MT_POSITION_Y, pos[i].y);
1008                 input_report_abs(dev, ABS_MT_PRESSURE, hw[i]->z);
1009         }
1010
1011         input_mt_drop_unused(dev);
1012
1013         /* Don't use active slot count to generate BTN_TOOL events. */
1014         input_mt_report_pointer_emulation(dev, false);
1015
1016         /* Send the number of fingers reported by touchpad itself. */
1017         input_mt_report_finger_count(dev, num_fingers);
1018
1019         synaptics_report_buttons(psmouse, sgm);
1020
1021         input_sync(dev);
1022 }
1023
1024 static void synaptics_image_sensor_process(struct psmouse *psmouse,
1025                                            struct synaptics_hw_state *sgm)
1026 {
1027         struct synaptics_data *priv = psmouse->private;
1028         int num_fingers;
1029
1030         /*
1031          * Update mt_state using the new finger count and current mt_state.
1032          */
1033         if (sgm->z == 0)
1034                 num_fingers = 0;
1035         else if (sgm->w >= 4)
1036                 num_fingers = 1;
1037         else if (sgm->w == 0)
1038                 num_fingers = 2;
1039         else if (sgm->w == 1)
1040                 num_fingers = priv->agm_count ? priv->agm_count : 3;
1041         else
1042                 num_fingers = 4;
1043
1044         /* Send resulting input events to user space */
1045         synaptics_report_mt_data(psmouse, sgm, num_fingers);
1046 }
1047
1048 static bool synaptics_has_multifinger(struct synaptics_data *priv)
1049 {
1050         if (SYN_CAP_MULTIFINGER(priv->info.capabilities))
1051                 return true;
1052
1053         /* Advanced gesture mode also sends multi finger data */
1054         return synaptics_has_agm(priv);
1055 }
1056
1057 /*
1058  *  called for each full received packet from the touchpad
1059  */
1060 static void synaptics_process_packet(struct psmouse *psmouse)
1061 {
1062         struct input_dev *dev = psmouse->dev;
1063         struct synaptics_data *priv = psmouse->private;
1064         struct synaptics_device_info *info = &priv->info;
1065         struct synaptics_hw_state hw;
1066         int num_fingers;
1067         int finger_width;
1068
1069         if (synaptics_parse_hw_state(psmouse->packet, priv, &hw))
1070                 return;
1071
1072         if (SYN_CAP_IMAGE_SENSOR(info->ext_cap_0c)) {
1073                 synaptics_image_sensor_process(psmouse, &hw);
1074                 return;
1075         }
1076
1077         if (hw.scroll) {
1078                 priv->scroll += hw.scroll;
1079
1080                 while (priv->scroll >= 4) {
1081                         input_report_key(dev, BTN_BACK, !hw.down);
1082                         input_sync(dev);
1083                         input_report_key(dev, BTN_BACK, hw.down);
1084                         input_sync(dev);
1085                         priv->scroll -= 4;
1086                 }
1087                 while (priv->scroll <= -4) {
1088                         input_report_key(dev, BTN_FORWARD, !hw.up);
1089                         input_sync(dev);
1090                         input_report_key(dev, BTN_FORWARD, hw.up);
1091                         input_sync(dev);
1092                         priv->scroll += 4;
1093                 }
1094                 return;
1095         }
1096
1097         if (hw.z > 0 && hw.x > 1) {
1098                 num_fingers = 1;
1099                 finger_width = 5;
1100                 if (SYN_CAP_EXTENDED(info->capabilities)) {
1101                         switch (hw.w) {
1102                         case 0 ... 1:
1103                                 if (synaptics_has_multifinger(priv))
1104                                         num_fingers = hw.w + 2;
1105                                 break;
1106                         case 2:
1107                                 if (SYN_MODEL_PEN(info->model_id))
1108                                         ;   /* Nothing, treat a pen as a single finger */
1109                                 break;
1110                         case 4 ... 15:
1111                                 if (SYN_CAP_PALMDETECT(info->capabilities))
1112                                         finger_width = hw.w;
1113                                 break;
1114                         }
1115                 }
1116         } else {
1117                 num_fingers = 0;
1118                 finger_width = 0;
1119         }
1120
1121         if (cr48_profile_sensor) {
1122                 synaptics_report_mt_data(psmouse, &hw, num_fingers);
1123                 return;
1124         }
1125
1126         if (SYN_CAP_ADV_GESTURE(info->ext_cap_0c))
1127                 synaptics_report_semi_mt_data(dev, &hw, &priv->agm,
1128                                               num_fingers);
1129
1130         /* Post events
1131          * BTN_TOUCH has to be first as mousedev relies on it when doing
1132          * absolute -> relative conversion
1133          */
1134         if (hw.z > 30) input_report_key(dev, BTN_TOUCH, 1);
1135         if (hw.z < 25) input_report_key(dev, BTN_TOUCH, 0);
1136
1137         if (num_fingers > 0) {
1138                 input_report_abs(dev, ABS_X, hw.x);
1139                 input_report_abs(dev, ABS_Y, synaptics_invert_y(hw.y));
1140         }
1141         input_report_abs(dev, ABS_PRESSURE, hw.z);
1142
1143         if (SYN_CAP_PALMDETECT(info->capabilities))
1144                 input_report_abs(dev, ABS_TOOL_WIDTH, finger_width);
1145
1146         input_report_key(dev, BTN_TOOL_FINGER, num_fingers == 1);
1147         if (synaptics_has_multifinger(priv)) {
1148                 input_report_key(dev, BTN_TOOL_DOUBLETAP, num_fingers == 2);
1149                 input_report_key(dev, BTN_TOOL_TRIPLETAP, num_fingers == 3);
1150         }
1151
1152         synaptics_report_buttons(psmouse, &hw);
1153
1154         input_sync(dev);
1155 }
1156
1157 static bool synaptics_validate_byte(struct psmouse *psmouse,
1158                                     int idx, enum synaptics_pkt_type pkt_type)
1159 {
1160         static const u8 newabs_mask[]     = { 0xC8, 0x00, 0x00, 0xC8, 0x00 };
1161         static const u8 newabs_rel_mask[] = { 0xC0, 0x00, 0x00, 0xC0, 0x00 };
1162         static const u8 newabs_rslt[]     = { 0x80, 0x00, 0x00, 0xC0, 0x00 };
1163         static const u8 oldabs_mask[]     = { 0xC0, 0x60, 0x00, 0xC0, 0x60 };
1164         static const u8 oldabs_rslt[]     = { 0xC0, 0x00, 0x00, 0x80, 0x00 };
1165         const u8 *packet = psmouse->packet;
1166
1167         if (idx < 0 || idx > 4)
1168                 return false;
1169
1170         switch (pkt_type) {
1171
1172         case SYN_NEWABS:
1173         case SYN_NEWABS_RELAXED:
1174                 return (packet[idx] & newabs_rel_mask[idx]) == newabs_rslt[idx];
1175
1176         case SYN_NEWABS_STRICT:
1177                 return (packet[idx] & newabs_mask[idx]) == newabs_rslt[idx];
1178
1179         case SYN_OLDABS:
1180                 return (packet[idx] & oldabs_mask[idx]) == oldabs_rslt[idx];
1181
1182         default:
1183                 psmouse_err(psmouse, "unknown packet type %d\n", pkt_type);
1184                 return false;
1185         }
1186 }
1187
1188 static enum synaptics_pkt_type
1189 synaptics_detect_pkt_type(struct psmouse *psmouse)
1190 {
1191         int i;
1192
1193         for (i = 0; i < 5; i++) {
1194                 if (!synaptics_validate_byte(psmouse, i, SYN_NEWABS_STRICT)) {
1195                         psmouse_info(psmouse, "using relaxed packet validation\n");
1196                         return SYN_NEWABS_RELAXED;
1197                 }
1198         }
1199
1200         return SYN_NEWABS_STRICT;
1201 }
1202
1203 static psmouse_ret_t synaptics_process_byte(struct psmouse *psmouse)
1204 {
1205         struct synaptics_data *priv = psmouse->private;
1206
1207         if (psmouse->pktcnt >= 6) { /* Full packet received */
1208                 if (unlikely(priv->pkt_type == SYN_NEWABS))
1209                         priv->pkt_type = synaptics_detect_pkt_type(psmouse);
1210
1211                 if (SYN_CAP_PASS_THROUGH(priv->info.capabilities) &&
1212                     synaptics_is_pt_packet(psmouse->packet)) {
1213                         if (priv->pt_port)
1214                                 synaptics_pass_pt_packet(priv->pt_port,
1215                                                          psmouse->packet);
1216                 } else
1217                         synaptics_process_packet(psmouse);
1218
1219                 return PSMOUSE_FULL_PACKET;
1220         }
1221
1222         return synaptics_validate_byte(psmouse, psmouse->pktcnt - 1, priv->pkt_type) ?
1223                 PSMOUSE_GOOD_DATA : PSMOUSE_BAD_DATA;
1224 }
1225
1226 /*****************************************************************************
1227  *      Driver initialization/cleanup functions
1228  ****************************************************************************/
1229 static void set_abs_position_params(struct input_dev *dev,
1230                                     struct synaptics_device_info *info,
1231                                     int x_code, int y_code)
1232 {
1233         int x_min = info->x_min ?: XMIN_NOMINAL;
1234         int x_max = info->x_max ?: XMAX_NOMINAL;
1235         int y_min = info->y_min ?: YMIN_NOMINAL;
1236         int y_max = info->y_max ?: YMAX_NOMINAL;
1237         int fuzz = SYN_CAP_REDUCED_FILTERING(info->ext_cap_0c) ?
1238                         SYN_REDUCED_FILTER_FUZZ : 0;
1239
1240         input_set_abs_params(dev, x_code, x_min, x_max, fuzz, 0);
1241         input_set_abs_params(dev, y_code, y_min, y_max, fuzz, 0);
1242         input_abs_set_res(dev, x_code, info->x_res);
1243         input_abs_set_res(dev, y_code, info->y_res);
1244 }
1245
1246 static int set_input_params(struct psmouse *psmouse,
1247                             struct synaptics_data *priv)
1248 {
1249         struct input_dev *dev = psmouse->dev;
1250         struct synaptics_device_info *info = &priv->info;
1251         int i;
1252         int error;
1253
1254         /* Reset default psmouse capabilities */
1255         __clear_bit(EV_REL, dev->evbit);
1256         bitmap_zero(dev->relbit, REL_CNT);
1257         bitmap_zero(dev->keybit, KEY_CNT);
1258
1259         /* Things that apply to both modes */
1260         __set_bit(INPUT_PROP_POINTER, dev->propbit);
1261
1262         input_set_capability(dev, EV_KEY, BTN_LEFT);
1263
1264         /* Clickpads report only left button */
1265         if (!SYN_CAP_CLICKPAD(info->ext_cap_0c)) {
1266                 input_set_capability(dev, EV_KEY, BTN_RIGHT);
1267                 if (SYN_CAP_MIDDLE_BUTTON(info->capabilities))
1268                         input_set_capability(dev, EV_KEY, BTN_MIDDLE);
1269         }
1270
1271         if (!priv->absolute_mode) {
1272                 /* Relative mode */
1273                 input_set_capability(dev, EV_REL, REL_X);
1274                 input_set_capability(dev, EV_REL, REL_Y);
1275                 return 0;
1276         }
1277
1278         /* Absolute mode */
1279         set_abs_position_params(dev, &priv->info, ABS_X, ABS_Y);
1280         input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
1281
1282         if (cr48_profile_sensor)
1283                 input_set_abs_params(dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
1284
1285         if (SYN_CAP_IMAGE_SENSOR(info->ext_cap_0c)) {
1286                 set_abs_position_params(dev, info,
1287                                         ABS_MT_POSITION_X, ABS_MT_POSITION_Y);
1288                 /* Image sensors can report per-contact pressure */
1289                 input_set_abs_params(dev, ABS_MT_PRESSURE, 0, 255, 0, 0);
1290
1291                 error = input_mt_init_slots(dev, 2,
1292                                             INPUT_MT_POINTER | INPUT_MT_TRACK);
1293                 if (error)
1294                         return error;
1295
1296                 /* Image sensors can signal 4 and 5 finger clicks */
1297                 input_set_capability(dev, EV_KEY, BTN_TOOL_QUADTAP);
1298                 input_set_capability(dev, EV_KEY, BTN_TOOL_QUINTTAP);
1299         } else if (SYN_CAP_ADV_GESTURE(info->ext_cap_0c)) {
1300                 set_abs_position_params(dev, info,
1301                                         ABS_MT_POSITION_X, ABS_MT_POSITION_Y);
1302                 /*
1303                  * Profile sensor in CR-48 tracks contacts reasonably well,
1304                  * other non-image sensors with AGM use semi-mt.
1305                  */
1306                 error = input_mt_init_slots(dev, 2,
1307                                             INPUT_MT_POINTER |
1308                                              (cr48_profile_sensor ?
1309                                               INPUT_MT_TRACK :
1310                                               INPUT_MT_SEMI_MT));
1311                 if (error)
1312                         return error;
1313
1314                 /*
1315                  * For semi-mt devices we send ABS_X/Y ourselves instead of
1316                  * input_mt_report_pointer_emulation. But
1317                  * input_mt_init_slots() resets the fuzz to 0, leading to a
1318                  * filtered ABS_MT_POSITION_X but an unfiltered ABS_X
1319                  * position. Let's re-initialize ABS_X/Y here.
1320                  */
1321                 if (!cr48_profile_sensor)
1322                         set_abs_position_params(dev, &priv->info, ABS_X, ABS_Y);
1323         }
1324
1325         if (SYN_CAP_PALMDETECT(info->capabilities))
1326                 input_set_abs_params(dev, ABS_TOOL_WIDTH, 0, 15, 0, 0);
1327
1328         input_set_capability(dev, EV_KEY, BTN_TOUCH);
1329         input_set_capability(dev, EV_KEY, BTN_TOOL_FINGER);
1330
1331         if (synaptics_has_multifinger(priv)) {
1332                 input_set_capability(dev, EV_KEY, BTN_TOOL_DOUBLETAP);
1333                 input_set_capability(dev, EV_KEY, BTN_TOOL_TRIPLETAP);
1334         }
1335
1336         if (SYN_CAP_FOUR_BUTTON(info->capabilities) ||
1337             SYN_CAP_MIDDLE_BUTTON(info->capabilities)) {
1338                 input_set_capability(dev, EV_KEY, BTN_FORWARD);
1339                 input_set_capability(dev, EV_KEY, BTN_BACK);
1340         }
1341
1342         if (!SYN_CAP_EXT_BUTTONS_STICK(info->ext_cap_10))
1343                 for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(info->ext_cap); i++)
1344                         input_set_capability(dev, EV_KEY, BTN_0 + i);
1345
1346         if (SYN_CAP_CLICKPAD(info->ext_cap_0c)) {
1347                 __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit);
1348                 if (psmouse_matches_pnp_id(psmouse, topbuttonpad_pnp_ids) &&
1349                     !SYN_CAP_EXT_BUTTONS_STICK(info->ext_cap_10))
1350                         __set_bit(INPUT_PROP_TOPBUTTONPAD, dev->propbit);
1351         }
1352
1353         return 0;
1354 }
1355
1356 static ssize_t synaptics_show_disable_gesture(struct psmouse *psmouse,
1357                                               void *data, char *buf)
1358 {
1359         struct synaptics_data *priv = psmouse->private;
1360
1361         return sprintf(buf, "%c\n", priv->disable_gesture ? '1' : '0');
1362 }
1363
1364 static ssize_t synaptics_set_disable_gesture(struct psmouse *psmouse,
1365                                              void *data, const char *buf,
1366                                              size_t len)
1367 {
1368         struct synaptics_data *priv = psmouse->private;
1369         unsigned int value;
1370         int err;
1371
1372         err = kstrtouint(buf, 10, &value);
1373         if (err)
1374                 return err;
1375
1376         if (value > 1)
1377                 return -EINVAL;
1378
1379         if (value == priv->disable_gesture)
1380                 return len;
1381
1382         priv->disable_gesture = value;
1383         if (value)
1384                 priv->mode |= SYN_BIT_DISABLE_GESTURE;
1385         else
1386                 priv->mode &= ~SYN_BIT_DISABLE_GESTURE;
1387
1388         if (synaptics_mode_cmd(psmouse, priv->mode))
1389                 return -EIO;
1390
1391         return len;
1392 }
1393
1394 PSMOUSE_DEFINE_ATTR(disable_gesture, S_IWUSR | S_IRUGO, NULL,
1395                     synaptics_show_disable_gesture,
1396                     synaptics_set_disable_gesture);
1397
1398 static void synaptics_disconnect(struct psmouse *psmouse)
1399 {
1400         struct synaptics_data *priv = psmouse->private;
1401
1402         /*
1403          * We might have left a breadcrumb when trying to
1404          * set up SMbus companion.
1405          */
1406         psmouse_smbus_cleanup(psmouse);
1407
1408         if (!priv->absolute_mode &&
1409                         SYN_ID_DISGEST_SUPPORTED(priv->info.identity))
1410                 device_remove_file(&psmouse->ps2dev.serio->dev,
1411                                    &psmouse_attr_disable_gesture.dattr);
1412
1413         synaptics_reset(psmouse);
1414         kfree(priv);
1415         psmouse->private = NULL;
1416 }
1417
1418 static int synaptics_reconnect(struct psmouse *psmouse)
1419 {
1420         struct synaptics_data *priv = psmouse->private;
1421         struct synaptics_device_info info;
1422         u8 param[2];
1423         int retry = 0;
1424         int error;
1425
1426         do {
1427                 psmouse_reset(psmouse);
1428                 if (retry) {
1429                         /*
1430                          * On some boxes, right after resuming, the touchpad
1431                          * needs some time to finish initializing (I assume
1432                          * it needs time to calibrate) and start responding
1433                          * to Synaptics-specific queries, so let's wait a
1434                          * bit.
1435                          */
1436                         ssleep(1);
1437                 }
1438                 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETID);
1439                 error = synaptics_detect(psmouse, 0);
1440         } while (error && ++retry < 3);
1441
1442         if (error)
1443                 return error;
1444
1445         if (retry > 1)
1446                 psmouse_dbg(psmouse, "reconnected after %d tries\n", retry);
1447
1448         error = synaptics_query_hardware(psmouse, &info);
1449         if (error) {
1450                 psmouse_err(psmouse, "Unable to query device.\n");
1451                 return error;
1452         }
1453
1454         error = synaptics_set_mode(psmouse);
1455         if (error) {
1456                 psmouse_err(psmouse, "Unable to initialize device.\n");
1457                 return error;
1458         }
1459
1460         if (info.identity != priv->info.identity ||
1461             info.model_id != priv->info.model_id ||
1462             info.capabilities != priv->info.capabilities ||
1463             info.ext_cap != priv->info.ext_cap) {
1464                 psmouse_err(psmouse,
1465                             "hardware appears to be different: id(%u-%u), model(%u-%u), caps(%x-%x), ext(%x-%x).\n",
1466                             priv->info.identity, info.identity,
1467                             priv->info.model_id, info.model_id,
1468                             priv->info.capabilities, info.capabilities,
1469                             priv->info.ext_cap, info.ext_cap);
1470                 return -ENXIO;
1471         }
1472
1473         return 0;
1474 }
1475
1476 static bool impaired_toshiba_kbc;
1477
1478 static const struct dmi_system_id toshiba_dmi_table[] __initconst = {
1479 #if defined(CONFIG_DMI) && defined(CONFIG_X86)
1480         {
1481                 /* Toshiba Satellite */
1482                 .matches = {
1483                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1484                         DMI_MATCH(DMI_PRODUCT_NAME, "Satellite"),
1485                 },
1486         },
1487         {
1488                 /* Toshiba Dynabook */
1489                 .matches = {
1490                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1491                         DMI_MATCH(DMI_PRODUCT_NAME, "dynabook"),
1492                 },
1493         },
1494         {
1495                 /* Toshiba Portege M300 */
1496                 .matches = {
1497                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1498                         DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE M300"),
1499                 },
1500
1501         },
1502         {
1503                 /* Toshiba Portege M300 */
1504                 .matches = {
1505                         DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
1506                         DMI_MATCH(DMI_PRODUCT_NAME, "Portable PC"),
1507                         DMI_MATCH(DMI_PRODUCT_VERSION, "Version 1.0"),
1508                 },
1509
1510         },
1511 #endif
1512         { }
1513 };
1514
1515 static bool broken_olpc_ec;
1516
1517 static const struct dmi_system_id olpc_dmi_table[] __initconst = {
1518 #if defined(CONFIG_DMI) && defined(CONFIG_OLPC)
1519         {
1520                 /* OLPC XO-1 or XO-1.5 */
1521                 .matches = {
1522                         DMI_MATCH(DMI_SYS_VENDOR, "OLPC"),
1523                         DMI_MATCH(DMI_PRODUCT_NAME, "XO"),
1524                 },
1525         },
1526 #endif
1527         { }
1528 };
1529
1530 static const struct dmi_system_id __initconst cr48_dmi_table[] = {
1531 #if defined(CONFIG_DMI) && defined(CONFIG_X86)
1532         {
1533                 /* Cr-48 Chromebook (Codename Mario) */
1534                 .matches = {
1535                         DMI_MATCH(DMI_SYS_VENDOR, "IEC"),
1536                         DMI_MATCH(DMI_PRODUCT_NAME, "Mario"),
1537                 },
1538         },
1539 #endif
1540         { }
1541 };
1542
1543 void __init synaptics_module_init(void)
1544 {
1545         impaired_toshiba_kbc = dmi_check_system(toshiba_dmi_table);
1546         broken_olpc_ec = dmi_check_system(olpc_dmi_table);
1547         cr48_profile_sensor = dmi_check_system(cr48_dmi_table);
1548 }
1549
1550 static int synaptics_init_ps2(struct psmouse *psmouse,
1551                               struct synaptics_device_info *info,
1552                               bool absolute_mode)
1553 {
1554         struct synaptics_data *priv;
1555         int err;
1556
1557         synaptics_apply_quirks(psmouse, info);
1558
1559         psmouse->private = priv = kzalloc(sizeof(struct synaptics_data), GFP_KERNEL);
1560         if (!priv)
1561                 return -ENOMEM;
1562
1563         priv->info = *info;
1564         priv->absolute_mode = absolute_mode;
1565         if (SYN_ID_DISGEST_SUPPORTED(info->identity))
1566                 priv->disable_gesture = true;
1567
1568         /*
1569          * Unfortunately ForcePad capability is not exported over PS/2,
1570          * so we have to resort to checking PNP IDs.
1571          */
1572         priv->is_forcepad = psmouse_matches_pnp_id(psmouse, forcepad_pnp_ids);
1573
1574         err = synaptics_set_mode(psmouse);
1575         if (err) {
1576                 psmouse_err(psmouse, "Unable to initialize device.\n");
1577                 goto init_fail;
1578         }
1579
1580         priv->pkt_type = SYN_MODEL_NEWABS(info->model_id) ?
1581                                         SYN_NEWABS : SYN_OLDABS;
1582
1583         psmouse_info(psmouse,
1584                      "Touchpad model: %lu, fw: %lu.%lu, id: %#x, caps: %#x/%#x/%#x/%#x, board id: %u, fw id: %u\n",
1585                      SYN_ID_MODEL(info->identity),
1586                      SYN_ID_MAJOR(info->identity), SYN_ID_MINOR(info->identity),
1587                      info->model_id,
1588                      info->capabilities, info->ext_cap, info->ext_cap_0c,
1589                      info->ext_cap_10, info->board_id, info->firmware_id);
1590
1591         err = set_input_params(psmouse, priv);
1592         if (err) {
1593                 psmouse_err(psmouse,
1594                             "failed to set up capabilities: %d\n", err);
1595                 goto init_fail;
1596         }
1597
1598         /*
1599          * Encode touchpad model so that it can be used to set
1600          * input device->id.version and be visible to userspace.
1601          * Because version is __u16 we have to drop something.
1602          * Hardware info bits seem to be good candidates as they
1603          * are documented to be for Synaptics corp. internal use.
1604          */
1605         psmouse->model = ((info->model_id & 0x00ff0000) >> 8) |
1606                           (info->model_id & 0x000000ff);
1607
1608         if (absolute_mode) {
1609                 psmouse->protocol_handler = synaptics_process_byte;
1610                 psmouse->pktsize = 6;
1611         } else {
1612                 /* Relative mode follows standard PS/2 mouse protocol */
1613                 psmouse->protocol_handler = psmouse_process_byte;
1614                 psmouse->pktsize = 3;
1615         }
1616
1617         psmouse->set_rate = synaptics_set_rate;
1618         psmouse->disconnect = synaptics_disconnect;
1619         psmouse->reconnect = synaptics_reconnect;
1620         psmouse->cleanup = synaptics_reset;
1621         /* Synaptics can usually stay in sync without extra help */
1622         psmouse->resync_time = 0;
1623
1624         if (SYN_CAP_PASS_THROUGH(info->capabilities))
1625                 synaptics_pt_create(psmouse);
1626
1627         /*
1628          * Toshiba's KBC seems to have trouble handling data from
1629          * Synaptics at full rate.  Switch to a lower rate (roughly
1630          * the same rate as a standard PS/2 mouse).
1631          */
1632         if (psmouse->rate >= 80 && impaired_toshiba_kbc) {
1633                 psmouse_info(psmouse,
1634                              "Toshiba %s detected, limiting rate to 40pps.\n",
1635                              dmi_get_system_info(DMI_PRODUCT_NAME));
1636                 psmouse->rate = 40;
1637         }
1638
1639         if (!priv->absolute_mode && SYN_ID_DISGEST_SUPPORTED(info->identity)) {
1640                 err = device_create_file(&psmouse->ps2dev.serio->dev,
1641                                          &psmouse_attr_disable_gesture.dattr);
1642                 if (err) {
1643                         psmouse_err(psmouse,
1644                                     "Failed to create disable_gesture attribute (%d)",
1645                                     err);
1646                         goto init_fail;
1647                 }
1648         }
1649
1650         return 0;
1651
1652  init_fail:
1653         kfree(priv);
1654         return err;
1655 }
1656
1657 static int __synaptics_init(struct psmouse *psmouse, bool absolute_mode)
1658 {
1659         struct synaptics_device_info info;
1660         int error;
1661
1662         psmouse_reset(psmouse);
1663
1664         error = synaptics_query_hardware(psmouse, &info);
1665         if (error) {
1666                 psmouse_err(psmouse, "Unable to query device: %d\n", error);
1667                 return error;
1668         }
1669
1670         return synaptics_init_ps2(psmouse, &info, absolute_mode);
1671 }
1672
1673 int synaptics_init_absolute(struct psmouse *psmouse)
1674 {
1675         return __synaptics_init(psmouse, true);
1676 }
1677
1678 int synaptics_init_relative(struct psmouse *psmouse)
1679 {
1680         return __synaptics_init(psmouse, false);
1681 }
1682
1683 static int synaptics_setup_ps2(struct psmouse *psmouse,
1684                                struct synaptics_device_info *info)
1685 {
1686         bool absolute_mode = true;
1687         int error;
1688
1689         /*
1690          * The OLPC XO has issues with Synaptics' absolute mode; the constant
1691          * packet spew overloads the EC such that key presses on the keyboard
1692          * are missed.  Given that, don't even attempt to use Absolute mode.
1693          * Relative mode seems to work just fine.
1694          */
1695         if (broken_olpc_ec) {
1696                 psmouse_info(psmouse,
1697                              "OLPC XO detected, forcing relative protocol.\n");
1698                 absolute_mode = false;
1699         }
1700
1701         error = synaptics_init_ps2(psmouse, info, absolute_mode);
1702         if (error)
1703                 return error;
1704
1705         return absolute_mode ? PSMOUSE_SYNAPTICS : PSMOUSE_SYNAPTICS_RELATIVE;
1706 }
1707
1708 #else /* CONFIG_MOUSE_PS2_SYNAPTICS */
1709
1710 void __init synaptics_module_init(void)
1711 {
1712 }
1713
1714 static int __maybe_unused
1715 synaptics_setup_ps2(struct psmouse *psmouse,
1716                     struct synaptics_device_info *info)
1717 {
1718         return -ENOSYS;
1719 }
1720
1721 #endif /* CONFIG_MOUSE_PS2_SYNAPTICS */
1722
1723 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS
1724
1725 /*
1726  * The newest Synaptics device can use a secondary bus (called InterTouch) which
1727  * provides a better bandwidth and allow a better control of the touchpads.
1728  * This is used to decide if we need to use this bus or not.
1729  */
1730 enum {
1731         SYNAPTICS_INTERTOUCH_NOT_SET = -1,
1732         SYNAPTICS_INTERTOUCH_OFF,
1733         SYNAPTICS_INTERTOUCH_ON,
1734 };
1735
1736 static int synaptics_intertouch = IS_ENABLED(CONFIG_RMI4_SMB) ?
1737                 SYNAPTICS_INTERTOUCH_NOT_SET : SYNAPTICS_INTERTOUCH_OFF;
1738 module_param_named(synaptics_intertouch, synaptics_intertouch, int, 0644);
1739 MODULE_PARM_DESC(synaptics_intertouch, "Use a secondary bus for the Synaptics device.");
1740
1741 static int synaptics_create_intertouch(struct psmouse *psmouse,
1742                                        struct synaptics_device_info *info,
1743                                        bool leave_breadcrumbs)
1744 {
1745         bool topbuttonpad =
1746                 psmouse_matches_pnp_id(psmouse, topbuttonpad_pnp_ids) &&
1747                 !SYN_CAP_EXT_BUTTONS_STICK(info->ext_cap_10);
1748         const struct rmi_device_platform_data pdata = {
1749                 .sensor_pdata = {
1750                         .sensor_type = rmi_sensor_touchpad,
1751                         .axis_align.flip_y = true,
1752                         .kernel_tracking = false,
1753                         .topbuttonpad = topbuttonpad,
1754                 },
1755                 .f30_data = {
1756                         .buttonpad = SYN_CAP_CLICKPAD(info->ext_cap_0c),
1757                         .trackstick_buttons =
1758                                 !!SYN_CAP_EXT_BUTTONS_STICK(info->ext_cap_10),
1759                 },
1760         };
1761         const struct i2c_board_info intertouch_board = {
1762                 I2C_BOARD_INFO("rmi4_smbus", 0x2c),
1763                 .flags = I2C_CLIENT_HOST_NOTIFY,
1764         };
1765
1766         return psmouse_smbus_init(psmouse, &intertouch_board,
1767                                   &pdata, sizeof(pdata), true,
1768                                   leave_breadcrumbs);
1769 }
1770
1771 /**
1772  * synaptics_setup_intertouch - called once the PS/2 devices are enumerated
1773  * and decides to instantiate a SMBus InterTouch device.
1774  */
1775 static int synaptics_setup_intertouch(struct psmouse *psmouse,
1776                                       struct synaptics_device_info *info,
1777                                       bool leave_breadcrumbs)
1778 {
1779         int error;
1780
1781         if (synaptics_intertouch == SYNAPTICS_INTERTOUCH_OFF)
1782                 return -ENXIO;
1783
1784         if (synaptics_intertouch == SYNAPTICS_INTERTOUCH_NOT_SET) {
1785                 if (!psmouse_matches_pnp_id(psmouse, topbuttonpad_pnp_ids) &&
1786                     !psmouse_matches_pnp_id(psmouse, smbus_pnp_ids)) {
1787
1788                         if (!psmouse_matches_pnp_id(psmouse, forcepad_pnp_ids))
1789                                 psmouse_info(psmouse,
1790                                              "Your touchpad (%s) says it can support a different bus. "
1791                                              "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",
1792                                              psmouse->ps2dev.serio->firmware_id);
1793
1794                         return -ENXIO;
1795                 }
1796         }
1797
1798         psmouse_info(psmouse, "Trying to set up SMBus access\n");
1799
1800         error = synaptics_create_intertouch(psmouse, info, leave_breadcrumbs);
1801         if (error) {
1802                 if (error == -EAGAIN)
1803                         psmouse_info(psmouse, "SMbus companion is not ready yet\n");
1804                 else
1805                         psmouse_err(psmouse, "unable to create intertouch device\n");
1806
1807                 return error;
1808         }
1809
1810         return 0;
1811 }
1812
1813 int synaptics_init_smbus(struct psmouse *psmouse)
1814 {
1815         struct synaptics_device_info info;
1816         int error;
1817
1818         psmouse_reset(psmouse);
1819
1820         error = synaptics_query_hardware(psmouse, &info);
1821         if (error) {
1822                 psmouse_err(psmouse, "Unable to query device: %d\n", error);
1823                 return error;
1824         }
1825
1826         if (!SYN_CAP_INTERTOUCH(info.ext_cap_0c))
1827                 return -ENXIO;
1828
1829         return synaptics_create_intertouch(psmouse, &info, false);
1830 }
1831
1832 #else /* CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
1833
1834 static int __maybe_unused
1835 synaptics_setup_intertouch(struct psmouse *psmouse,
1836                            struct synaptics_device_info *info,
1837                            bool leave_breadcrumbs)
1838 {
1839         return -ENOSYS;
1840 }
1841
1842 int synaptics_init_smbus(struct psmouse *psmouse)
1843 {
1844         return -ENOSYS;
1845 }
1846
1847 #endif /* CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
1848
1849 #if defined(CONFIG_MOUSE_PS2_SYNAPTICS) || \
1850     defined(CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS)
1851
1852 int synaptics_init(struct psmouse *psmouse)
1853 {
1854         struct synaptics_device_info info;
1855         int error;
1856         int retval;
1857
1858         psmouse_reset(psmouse);
1859
1860         error = synaptics_query_hardware(psmouse, &info);
1861         if (error) {
1862                 psmouse_err(psmouse, "Unable to query device: %d\n", error);
1863                 return error;
1864         }
1865
1866         if (SYN_CAP_INTERTOUCH(info.ext_cap_0c)) {
1867                 if ((!IS_ENABLED(CONFIG_RMI4_SMB) ||
1868                      !IS_ENABLED(CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS)) &&
1869                     /* Forcepads need F21, which is not ready */
1870                     !psmouse_matches_pnp_id(psmouse, forcepad_pnp_ids)) {
1871                         psmouse_warn(psmouse,
1872                                      "The touchpad can support a better bus than the too old PS/2 protocol. "
1873                                      "Make sure MOUSE_PS2_SYNAPTICS_SMBUS and RMI4_SMB are enabled to get a better touchpad experience.\n");
1874                 }
1875
1876                 error = synaptics_setup_intertouch(psmouse, &info, true);
1877                 if (!error)
1878                         return PSMOUSE_SYNAPTICS_SMBUS;
1879         }
1880
1881         retval = synaptics_setup_ps2(psmouse, &info);
1882         if (retval < 0) {
1883                 /*
1884                  * Not using any flavor of Synaptics support, so clean up
1885                  * SMbus breadcrumbs, if any.
1886                  */
1887                 psmouse_smbus_cleanup(psmouse);
1888         }
1889
1890         return retval;
1891 }
1892
1893 #else /* CONFIG_MOUSE_PS2_SYNAPTICS || CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
1894
1895 int synaptics_init(struct psmouse *psmouse)
1896 {
1897         return -ENOSYS;
1898 }
1899
1900 #endif /* CONFIG_MOUSE_PS2_SYNAPTICS || CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */