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0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * Synaptics TouchPad PS/2 mouse driver
0004  *
0005  *   2003 Dmitry Torokhov <dtor@mail.ru>
0006  *     Added support for pass-through port. Special thanks to Peter Berg Larsen
0007  *     for explaining various Synaptics quirks.
0008  *
0009  *   2003 Peter Osterlund <petero2@telia.com>
0010  *     Ported to 2.5 input device infrastructure.
0011  *
0012  *   Copyright (C) 2001 Stefan Gmeiner <riddlebox@freesurf.ch>
0013  *     start merging tpconfig and gpm code to a xfree-input module
0014  *     adding some changes and extensions (ex. 3rd and 4th button)
0015  *
0016  *   Copyright (c) 1997 C. Scott Ananian <cananian@alumni.priceton.edu>
0017  *   Copyright (c) 1998-2000 Bruce Kalk <kall@compass.com>
0018  *     code for the special synaptics commands (from the tpconfig-source)
0019  *
0020  * Trademarks are the property of their respective owners.
0021  */
0022 
0023 #include <linux/module.h>
0024 #include <linux/delay.h>
0025 #include <linux/dmi.h>
0026 #include <linux/input/mt.h>
0027 #include <linux/serio.h>
0028 #include <linux/libps2.h>
0029 #include <linux/rmi.h>
0030 #include <linux/i2c.h>
0031 #include <linux/slab.h>
0032 #include "psmouse.h"
0033 #include "synaptics.h"
0034 
0035 /*
0036  * The x/y limits are taken from the Synaptics TouchPad interfacing Guide,
0037  * section 2.3.2, which says that they should be valid regardless of the
0038  * actual size of the sensor.
0039  * Note that newer firmware allows querying device for maximum useable
0040  * coordinates.
0041  */
0042 #define XMIN 0
0043 #define XMAX 6143
0044 #define YMIN 0
0045 #define YMAX 6143
0046 #define XMIN_NOMINAL 1472
0047 #define XMAX_NOMINAL 5472
0048 #define YMIN_NOMINAL 1408
0049 #define YMAX_NOMINAL 4448
0050 
0051 /* Size in bits of absolute position values reported by the hardware */
0052 #define ABS_POS_BITS 13
0053 
0054 /*
0055  * These values should represent the absolute maximum value that will
0056  * be reported for a positive position value. Some Synaptics firmware
0057  * uses this value to indicate a finger near the edge of the touchpad
0058  * whose precise position cannot be determined.
0059  *
0060  * At least one touchpad is known to report positions in excess of this
0061  * value which are actually negative values truncated to the 13-bit
0062  * reporting range. These values have never been observed to be lower
0063  * than 8184 (i.e. -8), so we treat all values greater than 8176 as
0064  * negative and any other value as positive.
0065  */
0066 #define X_MAX_POSITIVE 8176
0067 #define Y_MAX_POSITIVE 8176
0068 
0069 /* maximum ABS_MT_POSITION displacement (in mm) */
0070 #define DMAX 10
0071 
0072 /*****************************************************************************
0073  *  Stuff we need even when we do not want native Synaptics support
0074  ****************************************************************************/
0075 
0076 /*
0077  * Set the synaptics touchpad mode byte by special commands
0078  */
0079 static int synaptics_mode_cmd(struct psmouse *psmouse, u8 mode)
0080 {
0081     u8 param[1];
0082     int error;
0083 
0084     error = ps2_sliced_command(&psmouse->ps2dev, mode);
0085     if (error)
0086         return error;
0087 
0088     param[0] = SYN_PS_SET_MODE2;
0089     error = ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_SETRATE);
0090     if (error)
0091         return error;
0092 
0093     return 0;
0094 }
0095 
0096 int synaptics_detect(struct psmouse *psmouse, bool set_properties)
0097 {
0098     struct ps2dev *ps2dev = &psmouse->ps2dev;
0099     u8 param[4] = { 0 };
0100 
0101     ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
0102     ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
0103     ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
0104     ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
0105     ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
0106 
0107     if (param[1] != 0x47)
0108         return -ENODEV;
0109 
0110     if (set_properties) {
0111         psmouse->vendor = "Synaptics";
0112         psmouse->name = "TouchPad";
0113     }
0114 
0115     return 0;
0116 }
0117 
0118 void synaptics_reset(struct psmouse *psmouse)
0119 {
0120     /* reset touchpad back to relative mode, gestures enabled */
0121     synaptics_mode_cmd(psmouse, 0);
0122 }
0123 
0124 #if defined(CONFIG_MOUSE_PS2_SYNAPTICS) || \
0125     defined(CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS)
0126 
0127 /* This list has been kindly provided by Synaptics. */
0128 static const char * const topbuttonpad_pnp_ids[] = {
0129     "LEN0017",
0130     "LEN0018",
0131     "LEN0019",
0132     "LEN0023",
0133     "LEN002A",
0134     "LEN002B",
0135     "LEN002C",
0136     "LEN002D",
0137     "LEN002E",
0138     "LEN0033", /* Helix */
0139     "LEN0034", /* T431s, L440, L540, T540, W540, X1 Carbon 2nd */
0140     "LEN0035", /* X240 */
0141     "LEN0036", /* T440 */
0142     "LEN0037", /* X1 Carbon 2nd */
0143     "LEN0038",
0144     "LEN0039", /* T440s */
0145     "LEN0041",
0146     "LEN0042", /* Yoga */
0147     "LEN0045",
0148     "LEN0047",
0149     "LEN2000", /* S540 */
0150     "LEN2001", /* Edge E431 */
0151     "LEN2002", /* Edge E531 */
0152     "LEN2003",
0153     "LEN2004", /* L440 */
0154     "LEN2005",
0155     "LEN2006", /* Edge E440/E540 */
0156     "LEN2007",
0157     "LEN2008",
0158     "LEN2009",
0159     "LEN200A",
0160     "LEN200B",
0161     NULL
0162 };
0163 
0164 static const char * const smbus_pnp_ids[] = {
0165     /* all of the topbuttonpad_pnp_ids are valid, we just add some extras */
0166     "LEN0048", /* X1 Carbon 3 */
0167     "LEN0046", /* X250 */
0168     "LEN0049", /* Yoga 11e */
0169     "LEN004a", /* W541 */
0170     "LEN005b", /* P50 */
0171     "LEN005e", /* T560 */
0172     "LEN006c", /* T470s */
0173     "LEN007a", /* T470s */
0174     "LEN0071", /* T480 */
0175     "LEN0072", /* X1 Carbon Gen 5 (2017) - Elan/ALPS trackpoint */
0176     "LEN0073", /* X1 Carbon G5 (Elantech) */
0177     "LEN0091", /* X1 Carbon 6 */
0178     "LEN0092", /* X1 Carbon 6 */
0179     "LEN0093", /* T480 */
0180     "LEN0096", /* X280 */
0181     "LEN0097", /* X280 -> ALPS trackpoint */
0182     "LEN0099", /* X1 Extreme Gen 1 / P1 Gen 1 */
0183     "LEN009b", /* T580 */
0184     "LEN0402", /* X1 Extreme Gen 2 / P1 Gen 2 */
0185     "LEN200f", /* T450s */
0186     "LEN2044", /* L470  */
0187     "LEN2054", /* E480 */
0188     "LEN2055", /* E580 */
0189     "LEN2068", /* T14 Gen 1 */
0190     "SYN3052", /* HP EliteBook 840 G4 */
0191     "SYN3221", /* HP 15-ay000 */
0192     "SYN323d", /* HP Spectre X360 13-w013dx */
0193     "SYN3257", /* HP Envy 13-ad105ng */
0194     NULL
0195 };
0196 
0197 static const char * const forcepad_pnp_ids[] = {
0198     "SYN300D",
0199     "SYN3014",
0200     NULL
0201 };
0202 
0203 /*
0204  * Send a command to the synaptics touchpad by special commands
0205  */
0206 static int synaptics_send_cmd(struct psmouse *psmouse, u8 cmd, u8 *param)
0207 {
0208     int error;
0209 
0210     error = ps2_sliced_command(&psmouse->ps2dev, cmd);
0211     if (error)
0212         return error;
0213 
0214     error = ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO);
0215     if (error)
0216         return error;
0217 
0218     return 0;
0219 }
0220 
0221 static int synaptics_query_int(struct psmouse *psmouse, u8 query_cmd, u32 *val)
0222 {
0223     int error;
0224     union {
0225         __be32 be_val;
0226         char buf[4];
0227     } resp = { 0 };
0228 
0229     error = synaptics_send_cmd(psmouse, query_cmd, resp.buf + 1);
0230     if (error)
0231         return error;
0232 
0233     *val = be32_to_cpu(resp.be_val);
0234     return 0;
0235 }
0236 
0237 /*
0238  * Identify Touchpad
0239  * See also the SYN_ID_* macros
0240  */
0241 static int synaptics_identify(struct psmouse *psmouse,
0242                   struct synaptics_device_info *info)
0243 {
0244     int error;
0245 
0246     error = synaptics_query_int(psmouse, SYN_QUE_IDENTIFY, &info->identity);
0247     if (error)
0248         return error;
0249 
0250     return SYN_ID_IS_SYNAPTICS(info->identity) ? 0 : -ENXIO;
0251 }
0252 
0253 /*
0254  * Read the model-id bytes from the touchpad
0255  * see also SYN_MODEL_* macros
0256  */
0257 static int synaptics_model_id(struct psmouse *psmouse,
0258                   struct synaptics_device_info *info)
0259 {
0260     return synaptics_query_int(psmouse, SYN_QUE_MODEL, &info->model_id);
0261 }
0262 
0263 /*
0264  * Read the firmware id from the touchpad
0265  */
0266 static int synaptics_firmware_id(struct psmouse *psmouse,
0267                  struct synaptics_device_info *info)
0268 {
0269     return synaptics_query_int(psmouse, SYN_QUE_FIRMWARE_ID,
0270                    &info->firmware_id);
0271 }
0272 
0273 /*
0274  * Read the board id and the "More Extended Queries" from the touchpad
0275  * The board id is encoded in the "QUERY MODES" response
0276  */
0277 static int synaptics_query_modes(struct psmouse *psmouse,
0278                  struct synaptics_device_info *info)
0279 {
0280     u8 bid[3];
0281     int error;
0282 
0283     /* firmwares prior 7.5 have no board_id encoded */
0284     if (SYN_ID_FULL(info->identity) < 0x705)
0285         return 0;
0286 
0287     error = synaptics_send_cmd(psmouse, SYN_QUE_MODES, bid);
0288     if (error)
0289         return error;
0290 
0291     info->board_id = ((bid[0] & 0xfc) << 6) | bid[1];
0292 
0293     if (SYN_MEXT_CAP_BIT(bid[0]))
0294         return synaptics_query_int(psmouse, SYN_QUE_MEXT_CAPAB_10,
0295                        &info->ext_cap_10);
0296 
0297     return 0;
0298 }
0299 
0300 /*
0301  * Read the capability-bits from the touchpad
0302  * see also the SYN_CAP_* macros
0303  */
0304 static int synaptics_capability(struct psmouse *psmouse,
0305                 struct synaptics_device_info *info)
0306 {
0307     int error;
0308 
0309     error = synaptics_query_int(psmouse, SYN_QUE_CAPABILITIES,
0310                     &info->capabilities);
0311     if (error)
0312         return error;
0313 
0314     info->ext_cap = info->ext_cap_0c = 0;
0315 
0316     /*
0317      * Older firmwares had submodel ID fixed to 0x47
0318      */
0319     if (SYN_ID_FULL(info->identity) < 0x705 &&
0320         SYN_CAP_SUBMODEL_ID(info->capabilities) != 0x47) {
0321         return -ENXIO;
0322     }
0323 
0324     /*
0325      * Unless capExtended is set the rest of the flags should be ignored
0326      */
0327     if (!SYN_CAP_EXTENDED(info->capabilities))
0328         info->capabilities = 0;
0329 
0330     if (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 1) {
0331         error = synaptics_query_int(psmouse, SYN_QUE_EXT_CAPAB,
0332                         &info->ext_cap);
0333         if (error) {
0334             psmouse_warn(psmouse,
0335                      "device claims to have extended capabilities, but I'm not able to read them.\n");
0336         } else {
0337             /*
0338              * if nExtBtn is greater than 8 it should be considered
0339              * invalid and treated as 0
0340              */
0341             if (SYN_CAP_MULTI_BUTTON_NO(info->ext_cap) > 8)
0342                 info->ext_cap &= ~SYN_CAP_MB_MASK;
0343         }
0344     }
0345 
0346     if (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 4) {
0347         error = synaptics_query_int(psmouse, SYN_QUE_EXT_CAPAB_0C,
0348                         &info->ext_cap_0c);
0349         if (error)
0350             psmouse_warn(psmouse,
0351                      "device claims to have extended capability 0x0c, but I'm not able to read it.\n");
0352     }
0353 
0354     return 0;
0355 }
0356 
0357 /*
0358  * Read touchpad resolution and maximum reported coordinates
0359  * Resolution is left zero if touchpad does not support the query
0360  */
0361 static int synaptics_resolution(struct psmouse *psmouse,
0362                 struct synaptics_device_info *info)
0363 {
0364     u8 resp[3];
0365     int error;
0366 
0367     if (SYN_ID_MAJOR(info->identity) < 4)
0368         return 0;
0369 
0370     error = synaptics_send_cmd(psmouse, SYN_QUE_RESOLUTION, resp);
0371     if (!error) {
0372         if (resp[0] != 0 && (resp[1] & 0x80) && resp[2] != 0) {
0373             info->x_res = resp[0]; /* x resolution in units/mm */
0374             info->y_res = resp[2]; /* y resolution in units/mm */
0375         }
0376     }
0377 
0378     if (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 5 &&
0379         SYN_CAP_MAX_DIMENSIONS(info->ext_cap_0c)) {
0380         error = synaptics_send_cmd(psmouse,
0381                        SYN_QUE_EXT_MAX_COORDS, resp);
0382         if (error) {
0383             psmouse_warn(psmouse,
0384                      "device claims to have max coordinates query, but I'm not able to read it.\n");
0385         } else {
0386             info->x_max = (resp[0] << 5) | ((resp[1] & 0x0f) << 1);
0387             info->y_max = (resp[2] << 5) | ((resp[1] & 0xf0) >> 3);
0388             psmouse_info(psmouse,
0389                      "queried max coordinates: x [..%d], y [..%d]\n",
0390                      info->x_max, info->y_max);
0391         }
0392     }
0393 
0394     if (SYN_CAP_MIN_DIMENSIONS(info->ext_cap_0c) &&
0395         (SYN_EXT_CAP_REQUESTS(info->capabilities) >= 7 ||
0396          /*
0397           * Firmware v8.1 does not report proper number of extended
0398           * capabilities, but has been proven to report correct min
0399           * coordinates.
0400           */
0401          SYN_ID_FULL(info->identity) == 0x801)) {
0402         error = synaptics_send_cmd(psmouse,
0403                        SYN_QUE_EXT_MIN_COORDS, resp);
0404         if (error) {
0405             psmouse_warn(psmouse,
0406                      "device claims to have min coordinates query, but I'm not able to read it.\n");
0407         } else {
0408             info->x_min = (resp[0] << 5) | ((resp[1] & 0x0f) << 1);
0409             info->y_min = (resp[2] << 5) | ((resp[1] & 0xf0) >> 3);
0410             psmouse_info(psmouse,
0411                      "queried min coordinates: x [%d..], y [%d..]\n",
0412                      info->x_min, info->y_min);
0413         }
0414     }
0415 
0416     return 0;
0417 }
0418 
0419 static int synaptics_query_hardware(struct psmouse *psmouse,
0420                     struct synaptics_device_info *info)
0421 {
0422     int error;
0423 
0424     memset(info, 0, sizeof(*info));
0425 
0426     error = synaptics_identify(psmouse, info);
0427     if (error)
0428         return error;
0429 
0430     error = synaptics_model_id(psmouse, info);
0431     if (error)
0432         return error;
0433 
0434     error = synaptics_firmware_id(psmouse, info);
0435     if (error)
0436         return error;
0437 
0438     error = synaptics_query_modes(psmouse, info);
0439     if (error)
0440         return error;
0441 
0442     error = synaptics_capability(psmouse, info);
0443     if (error)
0444         return error;
0445 
0446     error = synaptics_resolution(psmouse, info);
0447     if (error)
0448         return error;
0449 
0450     return 0;
0451 }
0452 
0453 #endif /* CONFIG_MOUSE_PS2_SYNAPTICS || CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
0454 
0455 #ifdef CONFIG_MOUSE_PS2_SYNAPTICS
0456 
0457 static bool cr48_profile_sensor;
0458 
0459 #define ANY_BOARD_ID 0
0460 struct min_max_quirk {
0461     const char * const *pnp_ids;
0462     struct {
0463         u32 min, max;
0464     } board_id;
0465     u32 x_min, x_max, y_min, y_max;
0466 };
0467 
0468 static const struct min_max_quirk min_max_pnpid_table[] = {
0469     {
0470         (const char * const []){"LEN0033", NULL},
0471         {ANY_BOARD_ID, ANY_BOARD_ID},
0472         1024, 5052, 2258, 4832
0473     },
0474     {
0475         (const char * const []){"LEN0042", NULL},
0476         {ANY_BOARD_ID, ANY_BOARD_ID},
0477         1232, 5710, 1156, 4696
0478     },
0479     {
0480         (const char * const []){"LEN0034", "LEN0036", "LEN0037",
0481                     "LEN0039", "LEN2002", "LEN2004",
0482                     NULL},
0483         {ANY_BOARD_ID, 2961},
0484         1024, 5112, 2024, 4832
0485     },
0486     {
0487         (const char * const []){"LEN2000", NULL},
0488         {ANY_BOARD_ID, ANY_BOARD_ID},
0489         1024, 5113, 2021, 4832
0490     },
0491     {
0492         (const char * const []){"LEN2001", NULL},
0493         {ANY_BOARD_ID, ANY_BOARD_ID},
0494         1024, 5022, 2508, 4832
0495     },
0496     {
0497         (const char * const []){"LEN2006", NULL},
0498         {2691, 2691},
0499         1024, 5045, 2457, 4832
0500     },
0501     {
0502         (const char * const []){"LEN2006", NULL},
0503         {ANY_BOARD_ID, ANY_BOARD_ID},
0504         1264, 5675, 1171, 4688
0505     },
0506     { }
0507 };
0508 
0509 /*****************************************************************************
0510  *  Synaptics communications functions
0511  ****************************************************************************/
0512 
0513 /*
0514  * Synaptics touchpads report the y coordinate from bottom to top, which is
0515  * opposite from what userspace expects.
0516  * This function is used to invert y before reporting.
0517  */
0518 static int synaptics_invert_y(int y)
0519 {
0520     return YMAX_NOMINAL + YMIN_NOMINAL - y;
0521 }
0522 
0523 /*
0524  * Apply quirk(s) if the hardware matches
0525  */
0526 static void synaptics_apply_quirks(struct psmouse *psmouse,
0527                    struct synaptics_device_info *info)
0528 {
0529     int i;
0530 
0531     for (i = 0; min_max_pnpid_table[i].pnp_ids; i++) {
0532         if (!psmouse_matches_pnp_id(psmouse,
0533                         min_max_pnpid_table[i].pnp_ids))
0534             continue;
0535 
0536         if (min_max_pnpid_table[i].board_id.min != ANY_BOARD_ID &&
0537             info->board_id < min_max_pnpid_table[i].board_id.min)
0538             continue;
0539 
0540         if (min_max_pnpid_table[i].board_id.max != ANY_BOARD_ID &&
0541             info->board_id > min_max_pnpid_table[i].board_id.max)
0542             continue;
0543 
0544         info->x_min = min_max_pnpid_table[i].x_min;
0545         info->x_max = min_max_pnpid_table[i].x_max;
0546         info->y_min = min_max_pnpid_table[i].y_min;
0547         info->y_max = min_max_pnpid_table[i].y_max;
0548         psmouse_info(psmouse,
0549                  "quirked min/max coordinates: x [%d..%d], y [%d..%d]\n",
0550                  info->x_min, info->x_max,
0551                  info->y_min, info->y_max);
0552         break;
0553     }
0554 }
0555 
0556 static bool synaptics_has_agm(struct synaptics_data *priv)
0557 {
0558     return (SYN_CAP_ADV_GESTURE(priv->info.ext_cap_0c) ||
0559         SYN_CAP_IMAGE_SENSOR(priv->info.ext_cap_0c));
0560 }
0561 
0562 static int synaptics_set_advanced_gesture_mode(struct psmouse *psmouse)
0563 {
0564     static u8 param = 0xc8;
0565     int error;
0566 
0567     error = ps2_sliced_command(&psmouse->ps2dev, SYN_QUE_MODEL);
0568     if (error)
0569         return error;
0570 
0571     error = ps2_command(&psmouse->ps2dev, &param, PSMOUSE_CMD_SETRATE);
0572     if (error)
0573         return error;
0574 
0575     return 0;
0576 }
0577 
0578 static int synaptics_set_mode(struct psmouse *psmouse)
0579 {
0580     struct synaptics_data *priv = psmouse->private;
0581     int error;
0582 
0583     priv->mode = 0;
0584     if (priv->absolute_mode)
0585         priv->mode |= SYN_BIT_ABSOLUTE_MODE;
0586     if (priv->disable_gesture)
0587         priv->mode |= SYN_BIT_DISABLE_GESTURE;
0588     if (psmouse->rate >= 80)
0589         priv->mode |= SYN_BIT_HIGH_RATE;
0590     if (SYN_CAP_EXTENDED(priv->info.capabilities))
0591         priv->mode |= SYN_BIT_W_MODE;
0592 
0593     error = synaptics_mode_cmd(psmouse, priv->mode);
0594     if (error)
0595         return error;
0596 
0597     if (priv->absolute_mode && synaptics_has_agm(priv)) {
0598         error = synaptics_set_advanced_gesture_mode(psmouse);
0599         if (error) {
0600             psmouse_err(psmouse,
0601                     "Advanced gesture mode init failed: %d\n",
0602                     error);
0603             return error;
0604         }
0605     }
0606 
0607     return 0;
0608 }
0609 
0610 static void synaptics_set_rate(struct psmouse *psmouse, unsigned int rate)
0611 {
0612     struct synaptics_data *priv = psmouse->private;
0613 
0614     if (rate >= 80) {
0615         priv->mode |= SYN_BIT_HIGH_RATE;
0616         psmouse->rate = 80;
0617     } else {
0618         priv->mode &= ~SYN_BIT_HIGH_RATE;
0619         psmouse->rate = 40;
0620     }
0621 
0622     synaptics_mode_cmd(psmouse, priv->mode);
0623 }
0624 
0625 /*****************************************************************************
0626  *  Synaptics pass-through PS/2 port support
0627  ****************************************************************************/
0628 static int synaptics_pt_write(struct serio *serio, u8 c)
0629 {
0630     struct psmouse *parent = serio_get_drvdata(serio->parent);
0631     u8 rate_param = SYN_PS_CLIENT_CMD; /* indicates that we want pass-through port */
0632     int error;
0633 
0634     error = ps2_sliced_command(&parent->ps2dev, c);
0635     if (error)
0636         return error;
0637 
0638     error = ps2_command(&parent->ps2dev, &rate_param, PSMOUSE_CMD_SETRATE);
0639     if (error)
0640         return error;
0641 
0642     return 0;
0643 }
0644 
0645 static int synaptics_pt_start(struct serio *serio)
0646 {
0647     struct psmouse *parent = serio_get_drvdata(serio->parent);
0648     struct synaptics_data *priv = parent->private;
0649 
0650     serio_pause_rx(parent->ps2dev.serio);
0651     priv->pt_port = serio;
0652     serio_continue_rx(parent->ps2dev.serio);
0653 
0654     return 0;
0655 }
0656 
0657 static void synaptics_pt_stop(struct serio *serio)
0658 {
0659     struct psmouse *parent = serio_get_drvdata(serio->parent);
0660     struct synaptics_data *priv = parent->private;
0661 
0662     serio_pause_rx(parent->ps2dev.serio);
0663     priv->pt_port = NULL;
0664     serio_continue_rx(parent->ps2dev.serio);
0665 }
0666 
0667 static int synaptics_is_pt_packet(u8 *buf)
0668 {
0669     return (buf[0] & 0xFC) == 0x84 && (buf[3] & 0xCC) == 0xC4;
0670 }
0671 
0672 static void synaptics_pass_pt_packet(struct serio *ptport, u8 *packet)
0673 {
0674     struct psmouse *child = serio_get_drvdata(ptport);
0675 
0676     if (child && child->state == PSMOUSE_ACTIVATED) {
0677         serio_interrupt(ptport, packet[1], 0);
0678         serio_interrupt(ptport, packet[4], 0);
0679         serio_interrupt(ptport, packet[5], 0);
0680         if (child->pktsize == 4)
0681             serio_interrupt(ptport, packet[2], 0);
0682     } else {
0683         serio_interrupt(ptport, packet[1], 0);
0684     }
0685 }
0686 
0687 static void synaptics_pt_activate(struct psmouse *psmouse)
0688 {
0689     struct synaptics_data *priv = psmouse->private;
0690     struct psmouse *child = serio_get_drvdata(priv->pt_port);
0691 
0692     /* adjust the touchpad to child's choice of protocol */
0693     if (child) {
0694         if (child->pktsize == 4)
0695             priv->mode |= SYN_BIT_FOUR_BYTE_CLIENT;
0696         else
0697             priv->mode &= ~SYN_BIT_FOUR_BYTE_CLIENT;
0698 
0699         if (synaptics_mode_cmd(psmouse, priv->mode))
0700             psmouse_warn(psmouse,
0701                      "failed to switch guest protocol\n");
0702     }
0703 }
0704 
0705 static void synaptics_pt_create(struct psmouse *psmouse)
0706 {
0707     struct serio *serio;
0708 
0709     serio = kzalloc(sizeof(struct serio), GFP_KERNEL);
0710     if (!serio) {
0711         psmouse_err(psmouse,
0712                 "not enough memory for pass-through port\n");
0713         return;
0714     }
0715 
0716     serio->id.type = SERIO_PS_PSTHRU;
0717     strlcpy(serio->name, "Synaptics pass-through", sizeof(serio->name));
0718     strlcpy(serio->phys, "synaptics-pt/serio0", sizeof(serio->phys));
0719     serio->write = synaptics_pt_write;
0720     serio->start = synaptics_pt_start;
0721     serio->stop = synaptics_pt_stop;
0722     serio->parent = psmouse->ps2dev.serio;
0723 
0724     psmouse->pt_activate = synaptics_pt_activate;
0725 
0726     psmouse_info(psmouse, "serio: %s port at %s\n",
0727              serio->name, psmouse->phys);
0728     serio_register_port(serio);
0729 }
0730 
0731 /*****************************************************************************
0732  *  Functions to interpret the absolute mode packets
0733  ****************************************************************************/
0734 
0735 static void synaptics_parse_agm(const u8 buf[],
0736                 struct synaptics_data *priv,
0737                 struct synaptics_hw_state *hw)
0738 {
0739     struct synaptics_hw_state *agm = &priv->agm;
0740     int agm_packet_type;
0741 
0742     agm_packet_type = (buf[5] & 0x30) >> 4;
0743     switch (agm_packet_type) {
0744     case 1:
0745         /* Gesture packet: (x, y, z) half resolution */
0746         agm->w = hw->w;
0747         agm->x = (((buf[4] & 0x0f) << 8) | buf[1]) << 1;
0748         agm->y = (((buf[4] & 0xf0) << 4) | buf[2]) << 1;
0749         agm->z = ((buf[3] & 0x30) | (buf[5] & 0x0f)) << 1;
0750         break;
0751 
0752     case 2:
0753         /* AGM-CONTACT packet: we are only interested in the count */
0754         priv->agm_count = buf[1];
0755         break;
0756 
0757     default:
0758         break;
0759     }
0760 }
0761 
0762 static void synaptics_parse_ext_buttons(const u8 buf[],
0763                     struct synaptics_data *priv,
0764                     struct synaptics_hw_state *hw)
0765 {
0766     unsigned int ext_bits =
0767         (SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap) + 1) >> 1;
0768     unsigned int ext_mask = GENMASK(ext_bits - 1, 0);
0769 
0770     hw->ext_buttons = buf[4] & ext_mask;
0771     hw->ext_buttons |= (buf[5] & ext_mask) << ext_bits;
0772 }
0773 
0774 static int synaptics_parse_hw_state(const u8 buf[],
0775                     struct synaptics_data *priv,
0776                     struct synaptics_hw_state *hw)
0777 {
0778     memset(hw, 0, sizeof(struct synaptics_hw_state));
0779 
0780     if (SYN_MODEL_NEWABS(priv->info.model_id)) {
0781         hw->w = (((buf[0] & 0x30) >> 2) |
0782              ((buf[0] & 0x04) >> 1) |
0783              ((buf[3] & 0x04) >> 2));
0784 
0785         if (synaptics_has_agm(priv) && hw->w == 2) {
0786             synaptics_parse_agm(buf, priv, hw);
0787             return 1;
0788         }
0789 
0790         hw->x = (((buf[3] & 0x10) << 8) |
0791              ((buf[1] & 0x0f) << 8) |
0792              buf[4]);
0793         hw->y = (((buf[3] & 0x20) << 7) |
0794              ((buf[1] & 0xf0) << 4) |
0795              buf[5]);
0796         hw->z = buf[2];
0797 
0798         hw->left  = (buf[0] & 0x01) ? 1 : 0;
0799         hw->right = (buf[0] & 0x02) ? 1 : 0;
0800 
0801         if (priv->is_forcepad) {
0802             /*
0803              * ForcePads, like Clickpads, use middle button
0804              * bits to report primary button clicks.
0805              * Unfortunately they report primary button not
0806              * only when user presses on the pad above certain
0807              * threshold, but also when there are more than one
0808              * finger on the touchpad, which interferes with
0809              * out multi-finger gestures.
0810              */
0811             if (hw->z == 0) {
0812                 /* No contacts */
0813                 priv->press = priv->report_press = false;
0814             } else if (hw->w >= 4 && ((buf[0] ^ buf[3]) & 0x01)) {
0815                 /*
0816                  * Single-finger touch with pressure above
0817                  * the threshold. If pressure stays long
0818                  * enough, we'll start reporting primary
0819                  * button. We rely on the device continuing
0820                  * sending data even if finger does not
0821                  * move.
0822                  */
0823                 if  (!priv->press) {
0824                     priv->press_start = jiffies;
0825                     priv->press = true;
0826                 } else if (time_after(jiffies,
0827                         priv->press_start +
0828                             msecs_to_jiffies(50))) {
0829                     priv->report_press = true;
0830                 }
0831             } else {
0832                 priv->press = false;
0833             }
0834 
0835             hw->left = priv->report_press;
0836 
0837         } else if (SYN_CAP_CLICKPAD(priv->info.ext_cap_0c)) {
0838             /*
0839              * Clickpad's button is transmitted as middle button,
0840              * however, since it is primary button, we will report
0841              * it as BTN_LEFT.
0842              */
0843             hw->left = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
0844 
0845         } else if (SYN_CAP_MIDDLE_BUTTON(priv->info.capabilities)) {
0846             hw->middle = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
0847             if (hw->w == 2)
0848                 hw->scroll = (s8)buf[1];
0849         }
0850 
0851         if (SYN_CAP_FOUR_BUTTON(priv->info.capabilities)) {
0852             hw->up   = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
0853             hw->down = ((buf[0] ^ buf[3]) & 0x02) ? 1 : 0;
0854         }
0855 
0856         if (SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap) > 0 &&
0857             ((buf[0] ^ buf[3]) & 0x02)) {
0858             synaptics_parse_ext_buttons(buf, priv, hw);
0859         }
0860     } else {
0861         hw->x = (((buf[1] & 0x1f) << 8) | buf[2]);
0862         hw->y = (((buf[4] & 0x1f) << 8) | buf[5]);
0863 
0864         hw->z = (((buf[0] & 0x30) << 2) | (buf[3] & 0x3F));
0865         hw->w = (((buf[1] & 0x80) >> 4) | ((buf[0] & 0x04) >> 1));
0866 
0867         hw->left  = (buf[0] & 0x01) ? 1 : 0;
0868         hw->right = (buf[0] & 0x02) ? 1 : 0;
0869     }
0870 
0871     /*
0872      * Convert wrap-around values to negative. (X|Y)_MAX_POSITIVE
0873      * is used by some firmware to indicate a finger at the edge of
0874      * the touchpad whose precise position cannot be determined, so
0875      * convert these values to the maximum axis value.
0876      */
0877     if (hw->x > X_MAX_POSITIVE)
0878         hw->x -= 1 << ABS_POS_BITS;
0879     else if (hw->x == X_MAX_POSITIVE)
0880         hw->x = XMAX;
0881 
0882     if (hw->y > Y_MAX_POSITIVE)
0883         hw->y -= 1 << ABS_POS_BITS;
0884     else if (hw->y == Y_MAX_POSITIVE)
0885         hw->y = YMAX;
0886 
0887     return 0;
0888 }
0889 
0890 static void synaptics_report_semi_mt_slot(struct input_dev *dev, int slot,
0891                       bool active, int x, int y)
0892 {
0893     input_mt_slot(dev, slot);
0894     input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
0895     if (active) {
0896         input_report_abs(dev, ABS_MT_POSITION_X, x);
0897         input_report_abs(dev, ABS_MT_POSITION_Y, synaptics_invert_y(y));
0898     }
0899 }
0900 
0901 static void synaptics_report_semi_mt_data(struct input_dev *dev,
0902                       const struct synaptics_hw_state *a,
0903                       const struct synaptics_hw_state *b,
0904                       int num_fingers)
0905 {
0906     if (num_fingers >= 2) {
0907         synaptics_report_semi_mt_slot(dev, 0, true, min(a->x, b->x),
0908                           min(a->y, b->y));
0909         synaptics_report_semi_mt_slot(dev, 1, true, max(a->x, b->x),
0910                           max(a->y, b->y));
0911     } else if (num_fingers == 1) {
0912         synaptics_report_semi_mt_slot(dev, 0, true, a->x, a->y);
0913         synaptics_report_semi_mt_slot(dev, 1, false, 0, 0);
0914     } else {
0915         synaptics_report_semi_mt_slot(dev, 0, false, 0, 0);
0916         synaptics_report_semi_mt_slot(dev, 1, false, 0, 0);
0917     }
0918 }
0919 
0920 static void synaptics_report_ext_buttons(struct psmouse *psmouse,
0921                      const struct synaptics_hw_state *hw)
0922 {
0923     struct input_dev *dev = psmouse->dev;
0924     struct synaptics_data *priv = psmouse->private;
0925     int ext_bits = (SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap) + 1) >> 1;
0926     int i;
0927 
0928     if (!SYN_CAP_MULTI_BUTTON_NO(priv->info.ext_cap))
0929         return;
0930 
0931     /* Bug in FW 8.1 & 8.2, buttons are reported only when ExtBit is 1 */
0932     if ((SYN_ID_FULL(priv->info.identity) == 0x801 ||
0933          SYN_ID_FULL(priv->info.identity) == 0x802) &&
0934         !((psmouse->packet[0] ^ psmouse->packet[3]) & 0x02))
0935         return;
0936 
0937     if (!SYN_CAP_EXT_BUTTONS_STICK(priv->info.ext_cap_10)) {
0938         for (i = 0; i < ext_bits; i++) {
0939             input_report_key(dev, BTN_0 + 2 * i,
0940                 hw->ext_buttons & BIT(i));
0941             input_report_key(dev, BTN_1 + 2 * i,
0942                 hw->ext_buttons & BIT(i + ext_bits));
0943         }
0944         return;
0945     }
0946 
0947     /*
0948      * This generation of touchpads has the trackstick buttons
0949      * physically wired to the touchpad. Re-route them through
0950      * the pass-through interface.
0951      */
0952     if (priv->pt_port) {
0953         u8 pt_buttons;
0954 
0955         /* The trackstick expects at most 3 buttons */
0956         pt_buttons = SYN_EXT_BUTTON_STICK_L(hw->ext_buttons)      |
0957                  SYN_EXT_BUTTON_STICK_R(hw->ext_buttons) << 1 |
0958                  SYN_EXT_BUTTON_STICK_M(hw->ext_buttons) << 2;
0959 
0960         serio_interrupt(priv->pt_port,
0961                 PSMOUSE_OOB_EXTRA_BTNS, SERIO_OOB_DATA);
0962         serio_interrupt(priv->pt_port, pt_buttons, SERIO_OOB_DATA);
0963     }
0964 }
0965 
0966 static void synaptics_report_buttons(struct psmouse *psmouse,
0967                      const struct synaptics_hw_state *hw)
0968 {
0969     struct input_dev *dev = psmouse->dev;
0970     struct synaptics_data *priv = psmouse->private;
0971 
0972     input_report_key(dev, BTN_LEFT, hw->left);
0973     input_report_key(dev, BTN_RIGHT, hw->right);
0974 
0975     if (SYN_CAP_MIDDLE_BUTTON(priv->info.capabilities))
0976         input_report_key(dev, BTN_MIDDLE, hw->middle);
0977 
0978     if (SYN_CAP_FOUR_BUTTON(priv->info.capabilities)) {
0979         input_report_key(dev, BTN_FORWARD, hw->up);
0980         input_report_key(dev, BTN_BACK, hw->down);
0981     }
0982 
0983     synaptics_report_ext_buttons(psmouse, hw);
0984 }
0985 
0986 static void synaptics_report_mt_data(struct psmouse *psmouse,
0987                      const struct synaptics_hw_state *sgm,
0988                      int num_fingers)
0989 {
0990     struct input_dev *dev = psmouse->dev;
0991     struct synaptics_data *priv = psmouse->private;
0992     const struct synaptics_hw_state *hw[2] = { sgm, &priv->agm };
0993     struct input_mt_pos pos[2];
0994     int slot[2], nsemi, i;
0995 
0996     nsemi = clamp_val(num_fingers, 0, 2);
0997 
0998     for (i = 0; i < nsemi; i++) {
0999         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 
1026 static 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 
1050 static 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  */
1062 static 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 
1162 static 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 
1193 static enum synaptics_pkt_type
1194 synaptics_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 
1208 static 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  ****************************************************************************/
1234 static 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 
1251 static 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 
1361 static 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 
1369 static 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 
1399 PSMOUSE_DEFINE_ATTR(disable_gesture, S_IWUSR | S_IRUGO, NULL,
1400             synaptics_show_disable_gesture,
1401             synaptics_set_disable_gesture);
1402 
1403 static 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 
1423 static 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 
1481 static bool impaired_toshiba_kbc;
1482 
1483 static 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 
1520 static bool broken_olpc_ec;
1521 
1522 static 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 
1535 static 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 
1548 void __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 
1555 static 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 
1662 static 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 
1678 int synaptics_init_absolute(struct psmouse *psmouse)
1679 {
1680     return __synaptics_init(psmouse, true);
1681 }
1682 
1683 int synaptics_init_relative(struct psmouse *psmouse)
1684 {
1685     return __synaptics_init(psmouse, false);
1686 }
1687 
1688 static 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 
1715 void __init synaptics_module_init(void)
1716 {
1717 }
1718 
1719 static int __maybe_unused
1720 synaptics_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  */
1735 enum {
1736     SYNAPTICS_INTERTOUCH_NOT_SET = -1,
1737     SYNAPTICS_INTERTOUCH_OFF,
1738     SYNAPTICS_INTERTOUCH_ON,
1739 };
1740 
1741 static int synaptics_intertouch = IS_ENABLED(CONFIG_RMI4_SMB) ?
1742         SYNAPTICS_INTERTOUCH_NOT_SET : SYNAPTICS_INTERTOUCH_OFF;
1743 module_param_named(synaptics_intertouch, synaptics_intertouch, int, 0644);
1744 MODULE_PARM_DESC(synaptics_intertouch, "Use a secondary bus for the Synaptics device.");
1745 
1746 static 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  */
1780 static 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 
1818 int 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 
1839 static int __maybe_unused
1840 synaptics_setup_intertouch(struct psmouse *psmouse,
1841                struct synaptics_device_info *info,
1842                bool leave_breadcrumbs)
1843 {
1844     return -ENOSYS;
1845 }
1846 
1847 int 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 
1857 int 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 
1900 int synaptics_init(struct psmouse *psmouse)
1901 {
1902     return -ENOSYS;
1903 }
1904 
1905 #endif /* CONFIG_MOUSE_PS2_SYNAPTICS || CONFIG_MOUSE_PS2_SYNAPTICS_SMBUS */
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