drivers/input/mouse/synaptics.c

   1 /*
   2  * Synaptics TouchPad PS/2 mouse driver
   3  *
   4  *   2003 Dmitry Torokhov <dtor@mail.ru>
   5  *     Added support for pass-through port. Special thanks to Peter Berg Larsen
   6  *     for explaining various Synaptics quirks.
   7  *
   8  *   2003 Peter Osterlund <petero2@telia.com>
   9  *     Ported to 2.5 input device infrastructure.
  10  *
  11  *   Copyright (C) 2001 Stefan Gmeiner <riddlebox@freesurf.ch>
  12  *     start merging tpconfig and gpm code to a xfree-input module
  13  *     adding some changes and extensions (ex. 3rd and 4th button)
  14  *
  15  *   Copyright (c) 1997 C. Scott Ananian <cananian@alumni.priceton.edu>
  16  *   Copyright (c) 1998-2000 Bruce Kalk <kall@compass.com>
  17  *     code for the special synaptics commands (from the tpconfig-source)
  18  *
  19  * This program is free software; you can redistribute it and/or modify it
  20  * under the terms of the GNU General Public License version 2 as published by
  21  * the Free Software Foundation.
  22  *
  23  * Trademarks are the property of their respective owners.
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/input.h>
  28 #include <linux/serio.h>
  29 #include <linux/libps2.h>
  30 #include "psmouse.h"
  31 #include "synaptics.h"
  32
  33 /*
  34  * The x/y limits are taken from the Synaptics TouchPad interfacing Guide,
  35  * section 2.3.2, which says that they should be valid regardless of the
  36  * actual size of the sensor.
  37  */
  38 #define XMIN_NOMINAL 1472
  39 #define XMAX_NOMINAL 5472
  40 #define YMIN_NOMINAL 1408
  41 #define YMAX_NOMINAL 4448
  42
  43 /*****************************************************************************
  44  *      Synaptics communications functions
  45  ****************************************************************************/
  46
  47 /*
  48  * Send a command to the synpatics touchpad by special commands
  49  */
  50 static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c, unsigned char *param)
  51 {
  52         if (psmouse_sliced_command(psmouse, c))
  53                 return -1;
  54         if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO))
  55                 return -1;
  56         return 0;
  57 }
  58
  59 /*
  60  * Set the synaptics touchpad mode byte by special commands
  61  */
  62 static int synaptics_mode_cmd(struct psmouse *psmouse, unsigned char mode)
  63 {
  64         unsigned char param[1];
  65
  66         if (psmouse_sliced_command(psmouse, mode))
  67                 return -1;
  68         param[0] = SYN_PS_SET_MODE2;
  69         if (ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_SETRATE))
  70                 return -1;
  71         return 0;
  72 }
  73
  74 /*
  75  * Read the model-id bytes from the touchpad
  76  * see also SYN_MODEL_* macros
  77  */
  78 static int synaptics_model_id(struct psmouse *psmouse)
  79 {
  80         struct synaptics_data *priv = psmouse->private;
  81         unsigned char mi[3];
  82
  83         if (synaptics_send_cmd(psmouse, SYN_QUE_MODEL, mi))
  84                 return -1;
  85         priv->model_id = (mi[0]<<16) | (mi[1]<<8) | mi[2];
  86         return 0;
  87 }
  88
  89 /*
  90  * Read the capability-bits from the touchpad
  91  * see also the SYN_CAP_* macros
  92  */
  93 static int synaptics_capability(struct psmouse *psmouse)
  94 {
  95         struct synaptics_data *priv = psmouse->private;
  96         unsigned char cap[3];
  97
  98         if (synaptics_send_cmd(psmouse, SYN_QUE_CAPABILITIES, cap))
  99                 return -1;
 100         priv->capabilities = (cap[0] << 16) | (cap[1] << 8) | cap[2];
 101         priv->ext_cap = 0;
 102         if (!SYN_CAP_VALID(priv->capabilities))
 103                 return -1;
 104
 105         /*
 106          * Unless capExtended is set the rest of the flags should be ignored
 107          */
 108         if (!SYN_CAP_EXTENDED(priv->capabilities))
 109                 priv->capabilities = 0;
 110
 111         if (SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 1) {
 112                 if (synaptics_send_cmd(psmouse, SYN_QUE_EXT_CAPAB, cap)) {
 113                         printk(KERN_ERR "Synaptics claims to have extended capabilities,"
 114                                " but I'm not able to read them.");
 115                 } else {
 116                         priv->ext_cap = (cap[0] << 16) | (cap[1] << 8) | cap[2];
 117
 118                         /*
 119                          * if nExtBtn is greater than 8 it should be considered
 120                          * invalid and treated as 0
 121                          */
 122                         if (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) > 8)
 123                                 priv->ext_cap &= 0xff0fff;
 124                 }
 125         }
 126         return 0;
 127 }
 128
 129 /*
 130  * Identify Touchpad
 131  * See also the SYN_ID_* macros
 132  */
 133 static int synaptics_identify(struct psmouse *psmouse)
 134 {
 135         struct synaptics_data *priv = psmouse->private;
 136         unsigned char id[3];
 137
 138         if (synaptics_send_cmd(psmouse, SYN_QUE_IDENTIFY, id))
 139                 return -1;
 140         priv->identity = (id[0]<<16) | (id[1]<<8) | id[2];
 141         if (SYN_ID_IS_SYNAPTICS(priv->identity))
 142                 return 0;
 143         return -1;
 144 }
 145
 146 static void print_ident(struct synaptics_data *priv)
 147 {
 148         printk(KERN_INFO "Synaptics Touchpad, model: %ld\n", SYN_ID_MODEL(priv->identity));
 149         printk(KERN_INFO " Firmware: %ld.%ld\n", SYN_ID_MAJOR(priv->identity),
 150                SYN_ID_MINOR(priv->identity));
 151         if (SYN_MODEL_ROT180(priv->model_id))
 152                 printk(KERN_INFO " 180 degree mounted touchpad\n");
 153         if (SYN_MODEL_PORTRAIT(priv->model_id))
 154                 printk(KERN_INFO " portrait touchpad\n");
 155         printk(KERN_INFO " Sensor: %ld\n", SYN_MODEL_SENSOR(priv->model_id));
 156         if (SYN_MODEL_NEWABS(priv->model_id))
 157                 printk(KERN_INFO " new absolute packet format\n");
 158         if (SYN_MODEL_PEN(priv->model_id))
 159                 printk(KERN_INFO " pen detection\n");
 160
 161         if (SYN_CAP_EXTENDED(priv->capabilities)) {
 162                 printk(KERN_INFO " Touchpad has extended capability bits\n");
 163                 if (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap))
 164                         printk(KERN_INFO " -> %d multi-buttons, i.e. besides standard buttons\n",
 165                                (int)(SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap)));
 166                 if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities))
 167                         printk(KERN_INFO " -> middle button\n");
 168                 if (SYN_CAP_FOUR_BUTTON(priv->capabilities))
 169                         printk(KERN_INFO " -> four buttons\n");
 170                 if (SYN_CAP_MULTIFINGER(priv->capabilities))
 171                         printk(KERN_INFO " -> multifinger detection\n");
 172                 if (SYN_CAP_PALMDETECT(priv->capabilities))
 173                         printk(KERN_INFO " -> palm detection\n");
 174                 if (SYN_CAP_PASS_THROUGH(priv->capabilities))
 175                         printk(KERN_INFO " -> pass-through port\n");
 176         }
 177 }
 178
 179 static int synaptics_query_hardware(struct psmouse *psmouse)
 180 {
 181         int retries = 0;
 182
 183         while ((retries++ < 3) && psmouse_reset(psmouse))
 184                 printk(KERN_ERR "synaptics reset failed\n");
 185
 186         if (synaptics_identify(psmouse))
 187                 return -1;
 188         if (synaptics_model_id(psmouse))
 189                 return -1;
 190         if (synaptics_capability(psmouse))
 191                 return -1;
 192
 193         return 0;
 194 }
 195
 196 static int synaptics_set_absolute_mode(struct psmouse *psmouse)
 197 {
 198         struct synaptics_data *priv = psmouse->private;
 199
 200         priv->mode = SYN_BIT_ABSOLUTE_MODE;
 201         if (SYN_ID_MAJOR(priv->identity) >= 4)
 202                 priv->mode |= SYN_BIT_DISABLE_GESTURE;
 203         if (SYN_CAP_EXTENDED(priv->capabilities))
 204                 priv->mode |= SYN_BIT_W_MODE;
 205
 206         if (synaptics_mode_cmd(psmouse, priv->mode))
 207                 return -1;
 208
 209         return 0;
 210 }
 211
 212 static void synaptics_set_rate(struct psmouse *psmouse, unsigned int rate)
 213 {
 214         struct synaptics_data *priv = psmouse->private;
 215
 216         if (rate >= 80) {
 217                 priv->mode |= SYN_BIT_HIGH_RATE;
 218                 psmouse->rate = 80;
 219         } else {
 220                 priv->mode &= ~SYN_BIT_HIGH_RATE;
 221                 psmouse->rate = 40;
 222         }
 223
 224         synaptics_mode_cmd(psmouse, priv->mode);
 225 }
 226
 227 /*****************************************************************************
 228  *      Synaptics pass-through PS/2 port support
 229  ****************************************************************************/
 230 static int synaptics_pt_write(struct serio *serio, unsigned char c)
 231 {
 232         struct psmouse *parent = serio->parent->private;
 233         char rate_param = SYN_PS_CLIENT_CMD; /* indicates that we want pass-through port */
 234
 235         if (psmouse_sliced_command(parent, c))
 236                 return -1;
 237         if (ps2_command(&parent->ps2dev, &rate_param, PSMOUSE_CMD_SETRATE))
 238                 return -1;
 239         return 0;
 240 }
 241
 242 static inline int synaptics_is_pt_packet(unsigned char *buf)
 243 {
 244         return (buf[0] & 0xFC) == 0x84 && (buf[3] & 0xCC) == 0xC4;
 245 }
 246
 247 static void synaptics_pass_pt_packet(struct serio *ptport, unsigned char *packet)
 248 {
 249         struct psmouse *child = ptport->private;
 250
 251         if (child && child->state == PSMOUSE_ACTIVATED) {
 252                 serio_interrupt(ptport, packet[1], 0, NULL);
 253                 serio_interrupt(ptport, packet[4], 0, NULL);
 254                 serio_interrupt(ptport, packet[5], 0, NULL);
 255                 if (child->type >= PSMOUSE_GENPS)
 256                         serio_interrupt(ptport, packet[2], 0, NULL);
 257         } else
 258                 serio_interrupt(ptport, packet[1], 0, NULL);
 259 }
 260
 261 static void synaptics_pt_activate(struct psmouse *psmouse)
 262 {
 263         struct psmouse *child = psmouse->ps2dev.serio->child->private;
 264         struct synaptics_data *priv = psmouse->private;
 265
 266         /* adjust the touchpad to child's choice of protocol */
 267         if (child) {
 268                 if (child->type >= PSMOUSE_GENPS)
 269                         priv->mode |= SYN_BIT_FOUR_BYTE_CLIENT;
 270                 else
 271                         priv->mode &= ~SYN_BIT_FOUR_BYTE_CLIENT;
 272
 273                 if (synaptics_mode_cmd(psmouse, priv->mode))
 274                         printk(KERN_INFO "synaptics: failed to switch guest protocol\n");
 275         }
 276 }
 277
 278 static void synaptics_pt_create(struct psmouse *psmouse)
 279 {
 280         struct serio *serio;
 281
 282         serio = kmalloc(sizeof(struct serio), GFP_KERNEL);
 283         if (!serio) {
 284                 printk(KERN_ERR "synaptics: not enough memory to allocate pass-through port\n");
 285                 return;
 286         }
 287
 288         memset(serio, 0, sizeof(struct serio));
 289
 290         serio->type = SERIO_PS_PSTHRU;
 291         strlcpy(serio->name, "Synaptics pass-through", sizeof(serio->name));
 292         strlcpy(serio->phys, "synaptics-pt/serio0", sizeof(serio->name));
 293         serio->write = synaptics_pt_write;
 294         serio->parent = psmouse->ps2dev.serio;
 295
 296         psmouse->pt_activate = synaptics_pt_activate;
 297
 298         psmouse->ps2dev.serio->child = serio;
 299 }
 300
 301 /*****************************************************************************
 302  *      Functions to interpret the absolute mode packets
 303  ****************************************************************************/
 304
 305 static void synaptics_parse_hw_state(unsigned char buf[], struct synaptics_data *priv, struct synaptics_hw_state *hw)
 306 {
 307         memset(hw, 0, sizeof(struct synaptics_hw_state));
 308
 309         if (SYN_MODEL_NEWABS(priv->model_id)) {
 310                 hw->x = (((buf[3] & 0x10) << 8) |
 311                          ((buf[1] & 0x0f) << 8) |
 312                          buf[4]);
 313                 hw->y = (((buf[3] & 0x20) << 7) |
 314                          ((buf[1] & 0xf0) << 4) |
 315                          buf[5]);
 316
 317                 hw->z = buf[2];
 318                 hw->w = (((buf[0] & 0x30) >> 2) |
 319                          ((buf[0] & 0x04) >> 1) |
 320                          ((buf[3] & 0x04) >> 2));
 321
 322                 hw->left  = (buf[0] & 0x01) ? 1 : 0;
 323                 hw->right = (buf[0] & 0x02) ? 1 : 0;
 324
 325                 if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities))
 326                         hw->middle = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
 327
 328                 if (SYN_CAP_FOUR_BUTTON(priv->capabilities)) {
 329                         hw->up   = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
 330                         hw->down = ((buf[0] ^ buf[3]) & 0x02) ? 1 : 0;
 331                 }
 332
 333                 if (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) &&
 334                     ((buf[0] ^ buf[3]) & 0x02)) {
 335                         switch (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) & ~0x01) {
 336                         default:
 337                                 /*
 338                                  * if nExtBtn is greater than 8 it should be
 339                                  * considered invalid and treated as 0
 340                                  */
 341                                 break;
 342                         case 8:
 343                                 hw->ext_buttons |= ((buf[5] & 0x08)) ? 0x80 : 0;
 344                                 hw->ext_buttons |= ((buf[4] & 0x08)) ? 0x40 : 0;
 345                         case 6:
 346                                 hw->ext_buttons |= ((buf[5] & 0x04)) ? 0x20 : 0;
 347                                 hw->ext_buttons |= ((buf[4] & 0x04)) ? 0x10 : 0;
 348                         case 4:
 349                                 hw->ext_buttons |= ((buf[5] & 0x02)) ? 0x08 : 0;
 350                                 hw->ext_buttons |= ((buf[4] & 0x02)) ? 0x04 : 0;
 351                         case 2:
 352                                 hw->ext_buttons |= ((buf[5] & 0x01)) ? 0x02 : 0;
 353                                 hw->ext_buttons |= ((buf[4] & 0x01)) ? 0x01 : 0;
 354                         }
 355                 }
 356         } else {
 357                 hw->x = (((buf[1] & 0x1f) << 8) | buf[2]);
 358                 hw->y = (((buf[4] & 0x1f) << 8) | buf[5]);
 359
 360                 hw->z = (((buf[0] & 0x30) << 2) | (buf[3] & 0x3F));
 361                 hw->w = (((buf[1] & 0x80) >> 4) | ((buf[0] & 0x04) >> 1));
 362
 363                 hw->left  = (buf[0] & 0x01) ? 1 : 0;
 364                 hw->right = (buf[0] & 0x02) ? 1 : 0;
 365         }
 366 }
 367
 368 /*
 369  *  called for each full received packet from the touchpad
 370  */
 371 static void synaptics_process_packet(struct psmouse *psmouse)
 372 {
 373         struct input_dev *dev = &psmouse->dev;
 374         struct synaptics_data *priv = psmouse->private;
 375         struct synaptics_hw_state hw;
 376         int num_fingers;
 377         int finger_width;
 378         int i;
 379
 380         synaptics_parse_hw_state(psmouse->packet, priv, &hw);
 381
 382         if (hw.z > 0) {
 383                 num_fingers = 1;
 384                 finger_width = 5;
 385                 if (SYN_CAP_EXTENDED(priv->capabilities)) {
 386                         switch (hw.w) {
 387                         case 0 ... 1:
 388                                 if (SYN_CAP_MULTIFINGER(priv->capabilities))
 389                                         num_fingers = hw.w + 2;
 390                                 break;
 391                         case 2:
 392                                 if (SYN_MODEL_PEN(priv->model_id))
 393                                         ;   /* Nothing, treat a pen as a single finger */
 394                                 break;
 395                         case 4 ... 15:
 396                                 if (SYN_CAP_PALMDETECT(priv->capabilities))
 397                                         finger_width = hw.w;
 398                                 break;
 399                         }
 400                 }
 401         } else {
 402                 num_fingers = 0;
 403                 finger_width = 0;
 404         }
 405
 406         /* Post events
 407          * BTN_TOUCH has to be first as mousedev relies on it when doing
 408          * absolute -> relative conversion
 409          */
 410         if (hw.z > 30) input_report_key(dev, BTN_TOUCH, 1);
 411         if (hw.z < 25) input_report_key(dev, BTN_TOUCH, 0);
 412
 413         if (hw.z > 0) {
 414                 input_report_abs(dev, ABS_X, hw.x);
 415                 input_report_abs(dev, ABS_Y, YMAX_NOMINAL + YMIN_NOMINAL - hw.y);
 416         }
 417         input_report_abs(dev, ABS_PRESSURE, hw.z);
 418
 419         input_report_abs(dev, ABS_TOOL_WIDTH, finger_width);
 420         input_report_key(dev, BTN_TOOL_FINGER, num_fingers == 1);
 421         input_report_key(dev, BTN_TOOL_DOUBLETAP, num_fingers == 2);
 422         input_report_key(dev, BTN_TOOL_TRIPLETAP, num_fingers == 3);
 423
 424         input_report_key(dev, BTN_LEFT, hw.left);
 425         input_report_key(dev, BTN_RIGHT, hw.right);
 426
 427         if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities))
 428                 input_report_key(dev, BTN_MIDDLE, hw.middle);
 429
 430         if (SYN_CAP_FOUR_BUTTON(priv->capabilities)) {
 431                 input_report_key(dev, BTN_FORWARD, hw.up);
 432                 input_report_key(dev, BTN_BACK, hw.down);
 433         }
 434
 435         for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap); i++)
 436                 input_report_key(dev, BTN_0 + i, hw.ext_buttons & (1 << i));
 437
 438         input_sync(dev);
 439 }
 440
 441 static int synaptics_validate_byte(unsigned char packet[], int idx, unsigned char pkt_type)
 442 {
 443         static unsigned char newabs_mask[]      = { 0xC8, 0x00, 0x00, 0xC8, 0x00 };
 444         static unsigned char newabs_rel_mask[]  = { 0xC0, 0x00, 0x00, 0xC0, 0x00 };
 445         static unsigned char newabs_rslt[]      = { 0x80, 0x00, 0x00, 0xC0, 0x00 };
 446         static unsigned char oldabs_mask[]      = { 0xC0, 0x60, 0x00, 0xC0, 0x60 };
 447         static unsigned char oldabs_rslt[]      = { 0xC0, 0x00, 0x00, 0x80, 0x00 };
 448
 449         if (idx < 0 || idx > 4)
 450                 return 0;
 451
 452         switch (pkt_type) {
 453                 case SYN_NEWABS:
 454                 case SYN_NEWABS_RELAXED:
 455                         return (packet[idx] & newabs_rel_mask[idx]) == newabs_rslt[idx];
 456
 457                 case SYN_NEWABS_STRICT:
 458                         return (packet[idx] & newabs_mask[idx]) == newabs_rslt[idx];
 459
 460                 case SYN_OLDABS:
 461                         return (packet[idx] & oldabs_mask[idx]) == oldabs_rslt[idx];
 462
 463                 default:
 464                         printk(KERN_ERR "synaptics: unknown packet type %d\n", pkt_type);
 465                         return 0;
 466         }
 467 }
 468
 469 static unsigned char synaptics_detect_pkt_type(struct psmouse *psmouse)
 470 {
 471         int i;
 472
 473         for (i = 0; i < 5; i++)
 474                 if (!synaptics_validate_byte(psmouse->packet, i, SYN_NEWABS_STRICT)) {
 475                         printk(KERN_INFO "synaptics: using relaxed packet validation\n");
 476                         return SYN_NEWABS_RELAXED;
 477                 }
 478
 479         return SYN_NEWABS_STRICT;
 480 }
 481
 482 static psmouse_ret_t synaptics_process_byte(struct psmouse *psmouse, struct pt_regs *regs)
 483 {
 484         struct input_dev *dev = &psmouse->dev;
 485         struct synaptics_data *priv = psmouse->private;
 486
 487         input_regs(dev, regs);
 488
 489         if (psmouse->pktcnt >= 6) { /* Full packet received */
 490                 if (unlikely(priv->pkt_type == SYN_NEWABS))
 491                         priv->pkt_type = synaptics_detect_pkt_type(psmouse);
 492
 493                 if (SYN_CAP_PASS_THROUGH(priv->capabilities) && synaptics_is_pt_packet(psmouse->packet)) {
 494                         if (psmouse->ps2dev.serio->child)
 495                                 synaptics_pass_pt_packet(psmouse->ps2dev.serio->child, psmouse->packet);
 496                 } else
 497                         synaptics_process_packet(psmouse);
 498
 499                 return PSMOUSE_FULL_PACKET;
 500         }
 501
 502         return synaptics_validate_byte(psmouse->packet, psmouse->pktcnt - 1, priv->pkt_type) ?
 503                 PSMOUSE_GOOD_DATA : PSMOUSE_BAD_DATA;
 504 }
 505
 506 /*****************************************************************************
 507  *      Driver initialization/cleanup functions
 508  ****************************************************************************/
 509 static void set_input_params(struct input_dev *dev, struct synaptics_data *priv)
 510 {
 511         int i;
 512
 513         set_bit(EV_ABS, dev->evbit);
 514         input_set_abs_params(dev, ABS_X, XMIN_NOMINAL, XMAX_NOMINAL, 0, 0);
 515         input_set_abs_params(dev, ABS_Y, YMIN_NOMINAL, YMAX_NOMINAL, 0, 0);
 516         input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
 517         set_bit(ABS_TOOL_WIDTH, dev->absbit);
 518
 519         set_bit(EV_KEY, dev->evbit);
 520         set_bit(BTN_TOUCH, dev->keybit);
 521         set_bit(BTN_TOOL_FINGER, dev->keybit);
 522         set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
 523         set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
 524
 525         set_bit(BTN_LEFT, dev->keybit);
 526         set_bit(BTN_RIGHT, dev->keybit);
 527
 528         if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities))
 529                 set_bit(BTN_MIDDLE, dev->keybit);
 530
 531         if (SYN_CAP_FOUR_BUTTON(priv->capabilities)) {
 532                 set_bit(BTN_FORWARD, dev->keybit);
 533                 set_bit(BTN_BACK, dev->keybit);
 534         }
 535
 536         for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap); i++)
 537                 set_bit(BTN_0 + i, dev->keybit);
 538
 539         clear_bit(EV_REL, dev->evbit);
 540         clear_bit(REL_X, dev->relbit);
 541         clear_bit(REL_Y, dev->relbit);
 542 }
 543
 544 void synaptics_reset(struct psmouse *psmouse)
 545 {
 546         /* reset touchpad back to relative mode, gestures enabled */
 547         synaptics_mode_cmd(psmouse, 0);
 548 }
 549
 550 static void synaptics_disconnect(struct psmouse *psmouse)
 551 {
 552         synaptics_reset(psmouse);
 553         kfree(psmouse->private);
 554 }
 555
 556 static int synaptics_reconnect(struct psmouse *psmouse)
 557 {
 558         struct synaptics_data *priv = psmouse->private;
 559         struct synaptics_data old_priv = *priv;
 560
 561         if (synaptics_detect(psmouse, 0))
 562                 return -1;
 563
 564         if (synaptics_query_hardware(psmouse)) {
 565                 printk(KERN_ERR "Unable to query Synaptics hardware.\n");
 566                 return -1;
 567         }
 568
 569         if (old_priv.identity != priv->identity ||
 570             old_priv.model_id != priv->model_id ||
 571             old_priv.capabilities != priv->capabilities ||
 572             old_priv.ext_cap != priv->ext_cap)
 573                 return -1;
 574
 575         if (synaptics_set_absolute_mode(psmouse)) {
 576                 printk(KERN_ERR "Unable to initialize Synaptics hardware.\n");
 577                 return -1;
 578         }
 579
 580         return 0;
 581 }
 582
 583 int synaptics_detect(struct psmouse *psmouse, int set_properties)
 584 {
 585         struct ps2dev *ps2dev = &psmouse->ps2dev;
 586         unsigned char param[4];
 587
 588         param[0] = 0;
 589
 590         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 591         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 592         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 593         ps2_command(ps2dev, param, PSMOUSE_CMD_SETRES);
 594         ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO);
 595
 596         if (param[1] != 0x47)
 597                 return -1;
 598
 599         if (set_properties) {
 600                 psmouse->vendor = "Synaptics";
 601                 psmouse->name = "TouchPad";
 602         }
 603
 604         return 0;
 605 }
 606
 607 int synaptics_init(struct psmouse *psmouse)
 608 {
 609         struct synaptics_data *priv;
 610
 611         psmouse->private = priv = kmalloc(sizeof(struct synaptics_data), GFP_KERNEL);
 612         if (!priv)
 613                 return -1;
 614         memset(priv, 0, sizeof(struct synaptics_data));
 615
 616         if (synaptics_query_hardware(psmouse)) {
 617                 printk(KERN_ERR "Unable to query Synaptics hardware.\n");
 618                 goto init_fail;
 619         }
 620
 621         if (synaptics_set_absolute_mode(psmouse)) {
 622                 printk(KERN_ERR "Unable to initialize Synaptics hardware.\n");
 623                 goto init_fail;
 624         }
 625
 626         priv->pkt_type = SYN_MODEL_NEWABS(priv->model_id) ? SYN_NEWABS : SYN_OLDABS;
 627
 628         if (SYN_CAP_PASS_THROUGH(priv->capabilities))
 629                 synaptics_pt_create(psmouse);
 630
 631         print_ident(priv);
 632         set_input_params(&psmouse->dev, priv);
 633
 634         psmouse->protocol_handler = synaptics_process_byte;
 635         psmouse->set_rate = synaptics_set_rate;
 636         psmouse->disconnect = synaptics_disconnect;
 637         psmouse->reconnect = synaptics_reconnect;
 638         psmouse->pktsize = 6;
 639
 640         return 0;
 641
 642  init_fail:
 643         kfree(priv);
 644         return -1;
 645 }
 646
 647