drivers/input/mouse/elantech.c

   1 /*
   2  * Elantech Touchpad driver (v5)
   3  *
   4  * Copyright (C) 2007-2008 Arjan Opmeer <arjan@opmeer.net>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 as published
   8  * by the Free Software Foundation.
   9  *
  10  * Trademarks are the property of their respective owners.
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/module.h>
  15 #include <linux/input.h>
  16 #include <linux/serio.h>
  17 #include <linux/libps2.h>
  18 #include "psmouse.h"
  19 #include "elantech.h"
  20
  21 #define elantech_debug(format, arg...)                          \
  22         do {                                                    \
  23                 if (etd->debug)                                 \
  24                         printk(KERN_DEBUG format, ##arg);       \
  25         } while (0)
  26
  27 /*
  28  * Send a Synaptics style sliced query command
  29  */
  30 static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c,
  31                                 unsigned char *param)
  32 {
  33         if (psmouse_sliced_command(psmouse, c) ||
  34             ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
  35                 pr_err("elantech.c: synaptics_send_cmd query 0x%02x failed.\n", c);
  36                 return -1;
  37         }
  38
  39         return 0;
  40 }
  41
  42 /*
  43  * A retrying version of ps2_command
  44  */
  45 static int elantech_ps2_command(struct psmouse *psmouse,
  46                                 unsigned char *param, int command)
  47 {
  48         struct ps2dev *ps2dev = &psmouse->ps2dev;
  49         struct elantech_data *etd = psmouse->private;
  50         int rc;
  51         int tries = ETP_PS2_COMMAND_TRIES;
  52
  53         do {
  54                 rc = ps2_command(ps2dev, param, command);
  55                 if (rc == 0)
  56                         break;
  57                 tries--;
  58                 elantech_debug("elantech.c: retrying ps2 command 0x%02x (%d).\n",
  59                         command, tries);
  60                 msleep(ETP_PS2_COMMAND_DELAY);
  61         } while (tries > 0);
  62
  63         if (rc)
  64                 pr_err("elantech.c: ps2 command 0x%02x failed.\n", command);
  65
  66         return rc;
  67 }
  68
  69 /*
  70  * Send an Elantech style special command to read a value from a register
  71  */
  72 static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg,
  73                                 unsigned char *val)
  74 {
  75         struct elantech_data *etd = psmouse->private;
  76         unsigned char param[3];
  77         int rc = 0;
  78
  79         if (reg < 0x10 || reg > 0x26)
  80                 return -1;
  81
  82         if (reg > 0x11 && reg < 0x20)
  83                 return -1;
  84
  85         switch (etd->hw_version) {
  86         case 1:
  87                 if (psmouse_sliced_command(psmouse, ETP_REGISTER_READ) ||
  88                     psmouse_sliced_command(psmouse, reg) ||
  89                     ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
  90                         rc = -1;
  91                 }
  92                 break;
  93
  94         case 2:
  95                 if (elantech_ps2_command(psmouse,  NULL, ETP_PS2_CUSTOM_COMMAND) ||
  96                     elantech_ps2_command(psmouse,  NULL, ETP_REGISTER_READ) ||
  97                     elantech_ps2_command(psmouse,  NULL, ETP_PS2_CUSTOM_COMMAND) ||
  98                     elantech_ps2_command(psmouse,  NULL, reg) ||
  99                     elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
 100                         rc = -1;
 101                 }
 102                 break;
 103         }
 104
 105         if (rc)
 106                 pr_err("elantech.c: failed to read register 0x%02x.\n", reg);
 107         else
 108                 *val = param[0];
 109
 110         return rc;
 111 }
 112
 113 /*
 114  * Send an Elantech style special command to write a register with a value
 115  */
 116 static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg,
 117                                 unsigned char val)
 118 {
 119         struct elantech_data *etd = psmouse->private;
 120         int rc = 0;
 121
 122         if (reg < 0x10 || reg > 0x26)
 123                 return -1;
 124
 125         if (reg > 0x11 && reg < 0x20)
 126                 return -1;
 127
 128         switch (etd->hw_version) {
 129         case 1:
 130                 if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) ||
 131                     psmouse_sliced_command(psmouse, reg) ||
 132                     psmouse_sliced_command(psmouse, val) ||
 133                     ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) {
 134                         rc = -1;
 135                 }
 136                 break;
 137
 138         case 2:
 139                 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
 140                     elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) ||
 141                     elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
 142                     elantech_ps2_command(psmouse, NULL, reg) ||
 143                     elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
 144                     elantech_ps2_command(psmouse, NULL, val) ||
 145                     elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
 146                         rc = -1;
 147                 }
 148                 break;
 149         }
 150
 151         if (rc)
 152                 pr_err("elantech.c: failed to write register 0x%02x with value 0x%02x.\n",
 153                         reg, val);
 154
 155         return rc;
 156 }
 157
 158 /*
 159  * Dump a complete mouse movement packet to the syslog
 160  */
 161 static void elantech_packet_dump(unsigned char *packet, int size)
 162 {
 163         int     i;
 164
 165         printk(KERN_DEBUG "elantech.c: PS/2 packet [");
 166         for (i = 0; i < size; i++)
 167                 printk("%s0x%02x ", (i) ? ", " : " ", packet[i]);
 168         printk("]\n");
 169 }
 170
 171 /*
 172  * Interpret complete data packets and report absolute mode input events for
 173  * hardware version 1. (4 byte packets)
 174  */
 175 static void elantech_report_absolute_v1(struct psmouse *psmouse)
 176 {
 177         struct input_dev *dev = psmouse->dev;
 178         struct elantech_data *etd = psmouse->private;
 179         unsigned char *packet = psmouse->packet;
 180         int fingers;
 181
 182         if (etd->fw_version_maj == 0x01) {
 183                 /* byte 0:  D   U  p1  p2   1  p3   R   L
 184                    byte 1:  f   0  th  tw  x9  x8  y9  y8 */
 185                 fingers = ((packet[1] & 0x80) >> 7) +
 186                                 ((packet[1] & 0x30) >> 4);
 187         } else {
 188                 /* byte 0: n1  n0  p2  p1   1  p3   R   L
 189                    byte 1:  0   0   0   0  x9  x8  y9  y8 */
 190                 fingers = (packet[0] & 0xc0) >> 6;
 191         }
 192
 193         input_report_key(dev, BTN_TOUCH, fingers != 0);
 194
 195         /* byte 2: x7  x6  x5  x4  x3  x2  x1  x0
 196            byte 3: y7  y6  y5  y4  y3  y2  y1  y0 */
 197         if (fingers) {
 198                 input_report_abs(dev, ABS_X,
 199                         ((packet[1] & 0x0c) << 6) | packet[2]);
 200                 input_report_abs(dev, ABS_Y, ETP_YMAX_V1 -
 201                         (((packet[1] & 0x03) << 8) | packet[3]));
 202         }
 203
 204         input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
 205         input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
 206         input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
 207         input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
 208         input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
 209
 210         if ((etd->fw_version_maj == 0x01) &&
 211             (etd->capabilities & ETP_CAP_HAS_ROCKER)) {
 212                 /* rocker up */
 213                 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40);
 214                 /* rocker down */
 215                 input_report_key(dev, BTN_BACK, packet[0] & 0x80);
 216         }
 217
 218         input_sync(dev);
 219 }
 220
 221 /*
 222  * Interpret complete data packets and report absolute mode input events for
 223  * hardware version 2. (6 byte packets)
 224  */
 225 static void elantech_report_absolute_v2(struct psmouse *psmouse)
 226 {
 227         struct input_dev *dev = psmouse->dev;
 228         unsigned char *packet = psmouse->packet;
 229         int fingers, x1, y1, x2, y2;
 230
 231         /* byte 0: n1  n0   .   .   .   .   R   L */
 232         fingers = (packet[0] & 0xc0) >> 6;
 233         input_report_key(dev, BTN_TOUCH, fingers != 0);
 234
 235         switch (fingers) {
 236         case 1:
 237                 /* byte 1: x15 x14 x13 x12 x11 x10 x9  x8
 238                    byte 2: x7  x6  x5  x4  x4  x2  x1  x0 */
 239                 input_report_abs(dev, ABS_X, (packet[1] << 8) | packet[2]);
 240                 /* byte 4: y15 y14 y13 y12 y11 y10 y8  y8
 241                    byte 5: y7  y6  y5  y4  y3  y2  y1  y0 */
 242                 input_report_abs(dev, ABS_Y, ETP_YMAX_V2 -
 243                         ((packet[4] << 8) | packet[5]));
 244                 break;
 245
 246         case 2:
 247                 /* The coordinate of each finger is reported separately with
 248                    a lower resolution for two finger touches */
 249                 /* byte 0:  .   .  ay8 ax8  .   .   .   .
 250                    byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0 */
 251                 x1 = ((packet[0] & 0x10) << 4) | packet[1];
 252                 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
 253                 y1 = ETP_2FT_YMAX - (((packet[0] & 0x20) << 3) | packet[2]);
 254                 /* byte 3:  .   .  by8 bx8  .   .   .   .
 255                    byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0 */
 256                 x2 = ((packet[3] & 0x10) << 4) | packet[4];
 257                 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
 258                 y2 = ETP_2FT_YMAX - (((packet[3] & 0x20) << 3) | packet[5]);
 259                 /* For compatibility with the X Synaptics driver scale up one
 260                    coordinate and report as ordinary mouse movent */
 261                 input_report_abs(dev, ABS_X, x1 << 2);
 262                 input_report_abs(dev, ABS_Y, y1 << 2);
 263                 /* For compatibility with the proprietary X Elantech driver
 264                    report both coordinates as hat coordinates */
 265                 input_report_abs(dev, ABS_HAT0X, x1);
 266                 input_report_abs(dev, ABS_HAT0Y, y1);
 267                 input_report_abs(dev, ABS_HAT1X, x2);
 268                 input_report_abs(dev, ABS_HAT1Y, y2);
 269                 break;
 270         }
 271
 272         input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
 273         input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
 274         input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
 275         input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
 276         input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
 277
 278         input_sync(dev);
 279 }
 280
 281 static int elantech_check_parity_v1(struct psmouse *psmouse)
 282 {
 283         struct elantech_data *etd = psmouse->private;
 284         unsigned char *packet = psmouse->packet;
 285         unsigned char p1, p2, p3;
 286
 287         /* Parity bits are placed differently */
 288         if (etd->fw_version_maj == 0x01) {
 289                 /* byte 0:  D   U  p1  p2   1  p3   R   L */
 290                 p1 = (packet[0] & 0x20) >> 5;
 291                 p2 = (packet[0] & 0x10) >> 4;
 292         } else {
 293                 /* byte 0: n1  n0  p2  p1   1  p3   R   L */
 294                 p1 = (packet[0] & 0x10) >> 4;
 295                 p2 = (packet[0] & 0x20) >> 5;
 296         }
 297
 298         p3 = (packet[0] & 0x04) >> 2;
 299
 300         return etd->parity[packet[1]] == p1 &&
 301                etd->parity[packet[2]] == p2 &&
 302                etd->parity[packet[3]] == p3;
 303 }
 304
 305 /*
 306  * Process byte stream from mouse and handle complete packets
 307  */
 308 static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
 309 {
 310         struct elantech_data *etd = psmouse->private;
 311
 312         if (psmouse->pktcnt < psmouse->pktsize)
 313                 return PSMOUSE_GOOD_DATA;
 314
 315         if (etd->debug > 1)
 316                 elantech_packet_dump(psmouse->packet, psmouse->pktsize);
 317
 318         switch (etd->hw_version) {
 319         case 1:
 320                 if (etd->paritycheck && !elantech_check_parity_v1(psmouse))
 321                         return PSMOUSE_BAD_DATA;
 322
 323                 elantech_report_absolute_v1(psmouse);
 324                 break;
 325
 326         case 2:
 327                 /* We don't know how to check parity in protocol v2 */
 328                 elantech_report_absolute_v2(psmouse);
 329                 break;
 330         }
 331
 332         return PSMOUSE_FULL_PACKET;
 333 }
 334
 335 /*
 336  * Put the touchpad into absolute mode
 337  */
 338 static int elantech_set_absolute_mode(struct psmouse *psmouse)
 339 {
 340         struct elantech_data *etd = psmouse->private;
 341         unsigned char val;
 342         int tries = ETP_READ_BACK_TRIES;
 343         int rc = 0;
 344
 345         switch (etd->hw_version) {
 346         case 1:
 347                 etd->reg_10 = 0x16;
 348                 etd->reg_11 = 0x8f;
 349                 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
 350                     elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
 351                         rc = -1;
 352                 }
 353                 break;
 354
 355         case 2:
 356                                         /* Windows driver values */
 357                 etd->reg_10 = 0x54;
 358                 etd->reg_11 = 0x88;     /* 0x8a */
 359                 etd->reg_21 = 0x60;     /* 0x00 */
 360                 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
 361                     elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
 362                     elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
 363                         rc = -1;
 364                         break;
 365                 }
 366                 /*
 367                  * Read back reg 0x10. The touchpad is probably initalising
 368                  * and not ready until we read back the value we just wrote.
 369                  */
 370                 do {
 371                         rc = elantech_read_reg(psmouse, 0x10, &val);
 372                         if (rc == 0)
 373                                 break;
 374                         tries--;
 375                         elantech_debug("elantech.c: retrying read (%d).\n",
 376                                 tries);
 377                         msleep(ETP_READ_BACK_DELAY);
 378                 } while (tries > 0);
 379                 if (rc)
 380                         pr_err("elantech.c: failed to read back register 0x10.\n");
 381                 break;
 382         }
 383
 384         if (rc)
 385                 pr_err("elantech.c: failed to initialise registers.\n");
 386
 387         return rc;
 388 }
 389
 390 /*
 391  * Set the appropriate event bits for the input subsystem
 392  */
 393 static void elantech_set_input_params(struct psmouse *psmouse)
 394 {
 395         struct input_dev *dev = psmouse->dev;
 396         struct elantech_data *etd = psmouse->private;
 397
 398         __set_bit(EV_KEY, dev->evbit);
 399         __set_bit(EV_ABS, dev->evbit);
 400
 401         __set_bit(BTN_LEFT, dev->keybit);
 402         __set_bit(BTN_RIGHT, dev->keybit);
 403
 404         __set_bit(BTN_TOUCH, dev->keybit);
 405         __set_bit(BTN_TOOL_FINGER, dev->keybit);
 406         __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
 407         __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
 408
 409         switch (etd->hw_version) {
 410         case 1:
 411                 /* Rocker button */
 412                 if ((etd->fw_version_maj == 0x01) &&
 413                     (etd->capabilities & ETP_CAP_HAS_ROCKER)) {
 414                         __set_bit(BTN_FORWARD, dev->keybit);
 415                         __set_bit(BTN_BACK, dev->keybit);
 416                 }
 417                 input_set_abs_params(dev, ABS_X, ETP_XMIN_V1, ETP_XMAX_V1, 0, 0);
 418                 input_set_abs_params(dev, ABS_Y, ETP_YMIN_V1, ETP_YMAX_V1, 0, 0);
 419                 break;
 420
 421         case 2:
 422                 input_set_abs_params(dev, ABS_X, ETP_XMIN_V2, ETP_XMAX_V2, 0, 0);
 423                 input_set_abs_params(dev, ABS_Y, ETP_YMIN_V2, ETP_YMAX_V2, 0, 0);
 424                 input_set_abs_params(dev, ABS_HAT0X, ETP_2FT_XMIN, ETP_2FT_XMAX, 0, 0);
 425                 input_set_abs_params(dev, ABS_HAT0Y, ETP_2FT_YMIN, ETP_2FT_YMAX, 0, 0);
 426                 input_set_abs_params(dev, ABS_HAT1X, ETP_2FT_XMIN, ETP_2FT_XMAX, 0, 0);
 427                 input_set_abs_params(dev, ABS_HAT1Y, ETP_2FT_YMIN, ETP_2FT_YMAX, 0, 0);
 428                 break;
 429         }
 430 }
 431
 432 struct elantech_attr_data {
 433         size_t          field_offset;
 434         unsigned char   reg;
 435 };
 436
 437 /*
 438  * Display a register value by reading a sysfs entry
 439  */
 440 static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
 441                                         char *buf)
 442 {
 443         struct elantech_data *etd = psmouse->private;
 444         struct elantech_attr_data *attr = data;
 445         unsigned char *reg = (unsigned char *) etd + attr->field_offset;
 446         int rc = 0;
 447
 448         if (attr->reg)
 449                 rc = elantech_read_reg(psmouse, attr->reg, reg);
 450
 451         return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
 452 }
 453
 454 /*
 455  * Write a register value by writing a sysfs entry
 456  */
 457 static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
 458                                      void *data, const char *buf, size_t count)
 459 {
 460         struct elantech_data *etd = psmouse->private;
 461         struct elantech_attr_data *attr = data;
 462         unsigned char *reg = (unsigned char *) etd + attr->field_offset;
 463         unsigned long value;
 464         int err;
 465
 466         err = strict_strtoul(buf, 16, &value);
 467         if (err)
 468                 return err;
 469
 470         if (value > 0xff)
 471                 return -EINVAL;
 472
 473         /* Do we need to preserve some bits for version 2 hardware too? */
 474         if (etd->hw_version == 1) {
 475                 if (attr->reg == 0x10)
 476                         /* Force absolute mode always on */
 477                         value |= ETP_R10_ABSOLUTE_MODE;
 478                 else if (attr->reg == 0x11)
 479                         /* Force 4 byte mode always on */
 480                         value |= ETP_R11_4_BYTE_MODE;
 481         }
 482
 483         if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
 484                 *reg = value;
 485
 486         return count;
 487 }
 488
 489 #define ELANTECH_INT_ATTR(_name, _register)                             \
 490         static struct elantech_attr_data elantech_attr_##_name = {      \
 491                 .field_offset = offsetof(struct elantech_data, _name),  \
 492                 .reg = _register,                                       \
 493         };                                                              \
 494         PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO,                   \
 495                             &elantech_attr_##_name,                     \
 496                             elantech_show_int_attr,                     \
 497                             elantech_set_int_attr)
 498
 499 ELANTECH_INT_ATTR(reg_10, 0x10);
 500 ELANTECH_INT_ATTR(reg_11, 0x11);
 501 ELANTECH_INT_ATTR(reg_20, 0x20);
 502 ELANTECH_INT_ATTR(reg_21, 0x21);
 503 ELANTECH_INT_ATTR(reg_22, 0x22);
 504 ELANTECH_INT_ATTR(reg_23, 0x23);
 505 ELANTECH_INT_ATTR(reg_24, 0x24);
 506 ELANTECH_INT_ATTR(reg_25, 0x25);
 507 ELANTECH_INT_ATTR(reg_26, 0x26);
 508 ELANTECH_INT_ATTR(debug, 0);
 509 ELANTECH_INT_ATTR(paritycheck, 0);
 510
 511 static struct attribute *elantech_attrs[] = {
 512         &psmouse_attr_reg_10.dattr.attr,
 513         &psmouse_attr_reg_11.dattr.attr,
 514         &psmouse_attr_reg_20.dattr.attr,
 515         &psmouse_attr_reg_21.dattr.attr,
 516         &psmouse_attr_reg_22.dattr.attr,
 517         &psmouse_attr_reg_23.dattr.attr,
 518         &psmouse_attr_reg_24.dattr.attr,
 519         &psmouse_attr_reg_25.dattr.attr,
 520         &psmouse_attr_reg_26.dattr.attr,
 521         &psmouse_attr_debug.dattr.attr,
 522         &psmouse_attr_paritycheck.dattr.attr,
 523         NULL
 524 };
 525
 526 static struct attribute_group elantech_attr_group = {
 527         .attrs = elantech_attrs,
 528 };
 529
 530 /*
 531  * Use magic knock to detect Elantech touchpad
 532  */
 533 int elantech_detect(struct psmouse *psmouse, int set_properties)
 534 {
 535         struct ps2dev *ps2dev = &psmouse->ps2dev;
 536         unsigned char param[3];
 537
 538         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
 539
 540         if (ps2_command(ps2dev,  NULL, PSMOUSE_CMD_DISABLE) ||
 541             ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11) ||
 542             ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11) ||
 543             ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11) ||
 544             ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
 545                 pr_debug("elantech.c: sending Elantech magic knock failed.\n");
 546                 return -1;
 547         }
 548
 549         /*
 550          * Report this in case there are Elantech models that use a different
 551          * set of magic numbers
 552          */
 553         if (param[0] != 0x3c || param[1] != 0x03 || param[2] != 0xc8) {
 554                 pr_debug("elantech.c: "
 555                          "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
 556                          param[0], param[1], param[2]);
 557                 return -1;
 558         }
 559
 560         /*
 561          * Query touchpad's firmware version and see if it reports known
 562          * value to avoid mis-detection. Logitech mice are known to respond
 563          * to Elantech magic knock and there might be more.
 564          */
 565         if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
 566                 pr_debug("elantech.c: failed to query firmware version.\n");
 567                 return -1;
 568         }
 569
 570         pr_debug("elantech.c: Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
 571                  param[0], param[1], param[2]);
 572
 573         if (param[0] == 0 || param[1] != 0) {
 574                 pr_debug("elantech.c: Probably not a real Elantech touchpad. Aborting.\n");
 575                 return -1;
 576         }
 577
 578         if (set_properties) {
 579                 psmouse->vendor = "Elantech";
 580                 psmouse->name = "Touchpad";
 581         }
 582
 583         return 0;
 584 }
 585
 586 /*
 587  * Clean up sysfs entries when disconnecting
 588  */
 589 static void elantech_disconnect(struct psmouse *psmouse)
 590 {
 591         sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
 592                            &elantech_attr_group);
 593         kfree(psmouse->private);
 594         psmouse->private = NULL;
 595 }
 596
 597 /*
 598  * Put the touchpad back into absolute mode when reconnecting
 599  */
 600 static int elantech_reconnect(struct psmouse *psmouse)
 601 {
 602         if (elantech_detect(psmouse, 0))
 603                 return -1;
 604
 605         if (elantech_set_absolute_mode(psmouse)) {
 606                 pr_err("elantech.c: failed to put touchpad back into absolute mode.\n");
 607                 return -1;
 608         }
 609
 610         return 0;
 611 }
 612
 613 /*
 614  * Initialize the touchpad and create sysfs entries
 615  */
 616 int elantech_init(struct psmouse *psmouse)
 617 {
 618         struct elantech_data *etd;
 619         int i, error;
 620         unsigned char param[3];
 621
 622         psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
 623         if (!etd)
 624                 return -1;
 625
 626         etd->parity[0] = 1;
 627         for (i = 1; i < 256; i++)
 628                 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
 629
 630         /*
 631          * Do the version query again so we can store the result
 632          */
 633         if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
 634                 pr_err("elantech.c: failed to query firmware version.\n");
 635                 goto init_fail;
 636         }
 637         etd->fw_version_maj = param[0];
 638         etd->fw_version_min = param[2];
 639
 640         /*
 641          * Assume every version greater than this is new EeePC style
 642          * hardware with 6 byte packets
 643          */
 644         if (etd->fw_version_maj >= 0x02 && etd->fw_version_min >= 0x30) {
 645                 etd->hw_version = 2;
 646                 /* For now show extra debug information */
 647                 etd->debug = 1;
 648                 /* Don't know how to do parity checking for version 2 */
 649                 etd->paritycheck = 0;
 650         } else {
 651                 etd->hw_version = 1;
 652                 etd->paritycheck = 1;
 653         }
 654         pr_info("elantech.c: assuming hardware version %d, firmware version %d.%d\n",
 655                 etd->hw_version, etd->fw_version_maj, etd->fw_version_min);
 656
 657         if (synaptics_send_cmd(psmouse, ETP_CAPABILITIES_QUERY, param)) {
 658                 pr_err("elantech.c: failed to query capabilities.\n");
 659                 goto init_fail;
 660         }
 661         pr_info("elantech.c: Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
 662                 param[0], param[1], param[2]);
 663         etd->capabilities = param[0];
 664
 665         if (elantech_set_absolute_mode(psmouse)) {
 666                 pr_err("elantech.c: failed to put touchpad into absolute mode.\n");
 667                 goto init_fail;
 668         }
 669
 670         elantech_set_input_params(psmouse);
 671
 672         error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
 673                                    &elantech_attr_group);
 674         if (error) {
 675                 pr_err("elantech.c: failed to create sysfs attributes, error: %d.\n",
 676                         error);
 677                 goto init_fail;
 678         }
 679
 680         psmouse->protocol_handler = elantech_process_byte;
 681         psmouse->disconnect = elantech_disconnect;
 682         psmouse->reconnect = elantech_reconnect;
 683         psmouse->pktsize = etd->hw_version == 2 ? 6 : 4;
 684
 685         return 0;
 686
 687  init_fail:
 688         kfree(etd);
 689         return -1;
 690 }