drivers/input/mouse/elantech.c

   1 /*
   2  * Elantech Touchpad driver (v6)
   3  *
   4  * Copyright (C) 2007-2009 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 #define pr_fmt(fmt) KBUILD_BASENAME ": " fmt
  14
  15 #include <linux/delay.h>
  16 #include <linux/slab.h>
  17 #include <linux/module.h>
  18 #include <linux/input.h>
  19 #include <linux/input/mt.h>
  20 #include <linux/serio.h>
  21 #include <linux/libps2.h>
  22 #include "psmouse.h"
  23 #include "elantech.h"
  24
  25 #define elantech_debug(fmt, ...)                                        \
  26         do {                                                            \
  27                 if (etd->debug)                                         \
  28                         printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__);  \
  29         } while (0)
  30
  31 static bool force_elantech;
  32 module_param_named(force_elantech, force_elantech, bool, 0644);
  33 MODULE_PARM_DESC(force_elantech, "Force the Elantech PS/2 protocol extension to be used, 1 = enabled, 0 = disabled (default).");
  34
  35 /*
  36  * Send a Synaptics style sliced query command
  37  */
  38 static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c,
  39                                 unsigned char *param)
  40 {
  41         if (psmouse_sliced_command(psmouse, c) ||
  42             ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
  43                 pr_err("synaptics_send_cmd query 0x%02x failed.\n", c);
  44                 return -1;
  45         }
  46
  47         return 0;
  48 }
  49
  50 /*
  51  * A retrying version of ps2_command
  52  */
  53 static int elantech_ps2_command(struct psmouse *psmouse,
  54                                 unsigned char *param, int command)
  55 {
  56         struct ps2dev *ps2dev = &psmouse->ps2dev;
  57         struct elantech_data *etd = psmouse->private;
  58         int rc;
  59         int tries = ETP_PS2_COMMAND_TRIES;
  60
  61         do {
  62                 rc = ps2_command(ps2dev, param, command);
  63                 if (rc == 0)
  64                         break;
  65                 tries--;
  66                 elantech_debug("retrying ps2 command 0x%02x (%d).\n",
  67                                 command, tries);
  68                 msleep(ETP_PS2_COMMAND_DELAY);
  69         } while (tries > 0);
  70
  71         if (rc)
  72                 pr_err("ps2 command 0x%02x failed.\n", command);
  73
  74         return rc;
  75 }
  76
  77 /*
  78  * Send an Elantech style special command to read a value from a register
  79  */
  80 static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg,
  81                                 unsigned char *val)
  82 {
  83         struct elantech_data *etd = psmouse->private;
  84         unsigned char param[3];
  85         int rc = 0;
  86
  87         if (reg < 0x10 || reg > 0x26)
  88                 return -1;
  89
  90         if (reg > 0x11 && reg < 0x20)
  91                 return -1;
  92
  93         switch (etd->hw_version) {
  94         case 1:
  95                 if (psmouse_sliced_command(psmouse, ETP_REGISTER_READ) ||
  96                     psmouse_sliced_command(psmouse, reg) ||
  97                     ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) {
  98                         rc = -1;
  99                 }
 100                 break;
 101
 102         case 2:
 103                 if (elantech_ps2_command(psmouse,  NULL, ETP_PS2_CUSTOM_COMMAND) ||
 104                     elantech_ps2_command(psmouse,  NULL, ETP_REGISTER_READ) ||
 105                     elantech_ps2_command(psmouse,  NULL, ETP_PS2_CUSTOM_COMMAND) ||
 106                     elantech_ps2_command(psmouse,  NULL, reg) ||
 107                     elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) {
 108                         rc = -1;
 109                 }
 110                 break;
 111         }
 112
 113         if (rc)
 114                 pr_err("failed to read register 0x%02x.\n", reg);
 115         else
 116                 *val = param[0];
 117
 118         return rc;
 119 }
 120
 121 /*
 122  * Send an Elantech style special command to write a register with a value
 123  */
 124 static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg,
 125                                 unsigned char val)
 126 {
 127         struct elantech_data *etd = psmouse->private;
 128         int rc = 0;
 129
 130         if (reg < 0x10 || reg > 0x26)
 131                 return -1;
 132
 133         if (reg > 0x11 && reg < 0x20)
 134                 return -1;
 135
 136         switch (etd->hw_version) {
 137         case 1:
 138                 if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) ||
 139                     psmouse_sliced_command(psmouse, reg) ||
 140                     psmouse_sliced_command(psmouse, val) ||
 141                     ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) {
 142                         rc = -1;
 143                 }
 144                 break;
 145
 146         case 2:
 147                 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
 148                     elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) ||
 149                     elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
 150                     elantech_ps2_command(psmouse, NULL, reg) ||
 151                     elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) ||
 152                     elantech_ps2_command(psmouse, NULL, val) ||
 153                     elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) {
 154                         rc = -1;
 155                 }
 156                 break;
 157         }
 158
 159         if (rc)
 160                 pr_err("failed to write register 0x%02x with value 0x%02x.\n",
 161                         reg, val);
 162
 163         return rc;
 164 }
 165
 166 /*
 167  * Dump a complete mouse movement packet to the syslog
 168  */
 169 static void elantech_packet_dump(unsigned char *packet, int size)
 170 {
 171         int     i;
 172
 173         printk(KERN_DEBUG pr_fmt("PS/2 packet ["));
 174         for (i = 0; i < size; i++)
 175                 printk("%s0x%02x ", (i) ? ", " : " ", packet[i]);
 176         printk("]\n");
 177 }
 178
 179 /*
 180  * Interpret complete data packets and report absolute mode input events for
 181  * hardware version 1. (4 byte packets)
 182  */
 183 static void elantech_report_absolute_v1(struct psmouse *psmouse)
 184 {
 185         struct input_dev *dev = psmouse->dev;
 186         struct elantech_data *etd = psmouse->private;
 187         unsigned char *packet = psmouse->packet;
 188         int fingers;
 189
 190         if (etd->fw_version < 0x020000) {
 191                 /*
 192                  * byte 0:  D   U  p1  p2   1  p3   R   L
 193                  * byte 1:  f   0  th  tw  x9  x8  y9  y8
 194                  */
 195                 fingers = ((packet[1] & 0x80) >> 7) +
 196                                 ((packet[1] & 0x30) >> 4);
 197         } else {
 198                 /*
 199                  * byte 0: n1  n0  p2  p1   1  p3   R   L
 200                  * byte 1:  0   0   0   0  x9  x8  y9  y8
 201                  */
 202                 fingers = (packet[0] & 0xc0) >> 6;
 203         }
 204
 205         if (etd->jumpy_cursor) {
 206                 if (fingers != 1) {
 207                         etd->single_finger_reports = 0;
 208                 } else if (etd->single_finger_reports < 2) {
 209                         /* Discard first 2 reports of one finger, bogus */
 210                         etd->single_finger_reports++;
 211                         elantech_debug("discarding packet\n");
 212                         return;
 213                 }
 214         }
 215
 216         input_report_key(dev, BTN_TOUCH, fingers != 0);
 217
 218         /*
 219          * byte 2: x7  x6  x5  x4  x3  x2  x1  x0
 220          * byte 3: y7  y6  y5  y4  y3  y2  y1  y0
 221          */
 222         if (fingers) {
 223                 input_report_abs(dev, ABS_X,
 224                         ((packet[1] & 0x0c) << 6) | packet[2]);
 225                 input_report_abs(dev, ABS_Y,
 226                         ETP_YMAX_V1 - (((packet[1] & 0x03) << 8) | packet[3]));
 227         }
 228
 229         input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
 230         input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
 231         input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
 232         input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
 233         input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
 234
 235         if (etd->fw_version < 0x020000 &&
 236             (etd->capabilities & ETP_CAP_HAS_ROCKER)) {
 237                 /* rocker up */
 238                 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40);
 239                 /* rocker down */
 240                 input_report_key(dev, BTN_BACK, packet[0] & 0x80);
 241         }
 242
 243         input_sync(dev);
 244 }
 245
 246 static void elantech_set_slot(struct input_dev *dev, int slot, bool active,
 247                               unsigned int x, unsigned int y)
 248 {
 249         input_mt_slot(dev, slot);
 250         input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
 251         if (active) {
 252                 input_report_abs(dev, ABS_MT_POSITION_X, x);
 253                 input_report_abs(dev, ABS_MT_POSITION_Y, y);
 254         }
 255 }
 256
 257 /* x1 < x2 and y1 < y2 when two fingers, x = y = 0 when not pressed */
 258 static void elantech_report_semi_mt_data(struct input_dev *dev,
 259                                          unsigned int num_fingers,
 260                                          unsigned int x1, unsigned int y1,
 261                                          unsigned int x2, unsigned int y2)
 262 {
 263         elantech_set_slot(dev, 0, num_fingers != 0, x1, y1);
 264         elantech_set_slot(dev, 1, num_fingers == 2, x2, y2);
 265 }
 266
 267 /*
 268  * Interpret complete data packets and report absolute mode input events for
 269  * hardware version 2. (6 byte packets)
 270  */
 271 static void elantech_report_absolute_v2(struct psmouse *psmouse)
 272 {
 273         struct elantech_data *etd = psmouse->private;
 274         struct input_dev *dev = psmouse->dev;
 275         unsigned char *packet = psmouse->packet;
 276         unsigned int fingers, x1 = 0, y1 = 0, x2 = 0, y2 = 0, width = 0, pres = 0;
 277
 278         /* byte 0: n1  n0   .   .   .   .   R   L */
 279         fingers = (packet[0] & 0xc0) >> 6;
 280         input_report_key(dev, BTN_TOUCH, fingers != 0);
 281
 282         switch (fingers) {
 283         case 3:
 284                 /*
 285                  * Same as one finger, except report of more than 3 fingers:
 286                  * byte 3:  n4  .   w1  w0   .   .   .   .
 287                  */
 288                 if (packet[3] & 0x80)
 289                         fingers = 4;
 290                 /* pass through... */
 291         case 1:
 292                 /*
 293                  * byte 1:  .   .   .   .   .  x10 x9  x8
 294                  * byte 2: x7  x6  x5  x4  x4  x2  x1  x0
 295                  */
 296                 x1 = ((packet[1] & 0x07) << 8) | packet[2];
 297                 /*
 298                  * byte 4:  .   .   .   .   .   .  y9  y8
 299                  * byte 5: y7  y6  y5  y4  y3  y2  y1  y0
 300                  */
 301                 y1 = ETP_YMAX_V2 - (((packet[4] & 0x03) << 8) | packet[5]);
 302
 303                 input_report_abs(dev, ABS_X, x1);
 304                 input_report_abs(dev, ABS_Y, y1);
 305
 306                 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
 307                 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
 308                 break;
 309
 310         case 2:
 311                 /*
 312                  * The coordinate of each finger is reported separately
 313                  * with a lower resolution for two finger touches:
 314                  * byte 0:  .   .  ay8 ax8  .   .   .   .
 315                  * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
 316                  */
 317                 x1 = ((packet[0] & 0x10) << 4) | packet[1];
 318                 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
 319                 y1 = ETP_2FT_YMAX - (((packet[0] & 0x20) << 3) | packet[2]);
 320                 /*
 321                  * byte 3:  .   .  by8 bx8  .   .   .   .
 322                  * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
 323                  */
 324                 x2 = ((packet[3] & 0x10) << 4) | packet[4];
 325                 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
 326                 y2 = ETP_2FT_YMAX - (((packet[3] & 0x20) << 3) | packet[5]);
 327                 /*
 328                  * For compatibility with the X Synaptics driver scale up
 329                  * one coordinate and report as ordinary mouse movent
 330                  */
 331                 input_report_abs(dev, ABS_X, x1 << 2);
 332                 input_report_abs(dev, ABS_Y, y1 << 2);
 333
 334                 /* Unknown so just report sensible values */
 335                 pres = 127;
 336                 width = 7;
 337                 break;
 338         }
 339
 340         elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
 341         input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
 342         input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
 343         input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
 344         input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4);
 345         input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
 346         input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
 347         if (etd->reports_pressure) {
 348                 input_report_abs(dev, ABS_PRESSURE, pres);
 349                 input_report_abs(dev, ABS_TOOL_WIDTH, width);
 350         }
 351
 352         input_sync(dev);
 353 }
 354
 355 static int elantech_check_parity_v1(struct psmouse *psmouse)
 356 {
 357         struct elantech_data *etd = psmouse->private;
 358         unsigned char *packet = psmouse->packet;
 359         unsigned char p1, p2, p3;
 360
 361         /* Parity bits are placed differently */
 362         if (etd->fw_version < 0x020000) {
 363                 /* byte 0:  D   U  p1  p2   1  p3   R   L */
 364                 p1 = (packet[0] & 0x20) >> 5;
 365                 p2 = (packet[0] & 0x10) >> 4;
 366         } else {
 367                 /* byte 0: n1  n0  p2  p1   1  p3   R   L */
 368                 p1 = (packet[0] & 0x10) >> 4;
 369                 p2 = (packet[0] & 0x20) >> 5;
 370         }
 371
 372         p3 = (packet[0] & 0x04) >> 2;
 373
 374         return etd->parity[packet[1]] == p1 &&
 375                etd->parity[packet[2]] == p2 &&
 376                etd->parity[packet[3]] == p3;
 377 }
 378
 379 /*
 380  * Process byte stream from mouse and handle complete packets
 381  */
 382 static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
 383 {
 384         struct elantech_data *etd = psmouse->private;
 385
 386         if (psmouse->pktcnt < psmouse->pktsize)
 387                 return PSMOUSE_GOOD_DATA;
 388
 389         if (etd->debug > 1)
 390                 elantech_packet_dump(psmouse->packet, psmouse->pktsize);
 391
 392         switch (etd->hw_version) {
 393         case 1:
 394                 if (etd->paritycheck && !elantech_check_parity_v1(psmouse))
 395                         return PSMOUSE_BAD_DATA;
 396
 397                 elantech_report_absolute_v1(psmouse);
 398                 break;
 399
 400         case 2:
 401                 /* We don't know how to check parity in protocol v2 */
 402                 elantech_report_absolute_v2(psmouse);
 403                 break;
 404         }
 405
 406         return PSMOUSE_FULL_PACKET;
 407 }
 408
 409 /*
 410  * Put the touchpad into absolute mode
 411  */
 412 static int elantech_set_absolute_mode(struct psmouse *psmouse)
 413 {
 414         struct elantech_data *etd = psmouse->private;
 415         unsigned char val;
 416         int tries = ETP_READ_BACK_TRIES;
 417         int rc = 0;
 418
 419         switch (etd->hw_version) {
 420         case 1:
 421                 etd->reg_10 = 0x16;
 422                 etd->reg_11 = 0x8f;
 423                 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
 424                     elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
 425                         rc = -1;
 426                 }
 427                 break;
 428
 429         case 2:
 430                                         /* Windows driver values */
 431                 etd->reg_10 = 0x54;
 432                 etd->reg_11 = 0x88;     /* 0x8a */
 433                 etd->reg_21 = 0x60;     /* 0x00 */
 434                 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
 435                     elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
 436                     elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
 437                         rc = -1;
 438                         break;
 439                 }
 440         }
 441
 442         if (rc == 0) {
 443                 /*
 444                  * Read back reg 0x10. For hardware version 1 we must make
 445                  * sure the absolute mode bit is set. For hardware version 2
 446                  * the touchpad is probably initalising and not ready until
 447                  * we read back the value we just wrote.
 448                  */
 449                 do {
 450                         rc = elantech_read_reg(psmouse, 0x10, &val);
 451                         if (rc == 0)
 452                                 break;
 453                         tries--;
 454                         elantech_debug("retrying read (%d).\n", tries);
 455                         msleep(ETP_READ_BACK_DELAY);
 456                 } while (tries > 0);
 457
 458                 if (rc) {
 459                         pr_err("failed to read back register 0x10.\n");
 460                 } else if (etd->hw_version == 1 &&
 461                            !(val & ETP_R10_ABSOLUTE_MODE)) {
 462                         pr_err("touchpad refuses to switch to absolute mode.\n");
 463                         rc = -1;
 464                 }
 465         }
 466
 467         if (rc)
 468                 pr_err("failed to initialise registers.\n");
 469
 470         return rc;
 471 }
 472
 473 /*
 474  * Set the appropriate event bits for the input subsystem
 475  */
 476 static void elantech_set_input_params(struct psmouse *psmouse)
 477 {
 478         struct input_dev *dev = psmouse->dev;
 479         struct elantech_data *etd = psmouse->private;
 480
 481         __set_bit(EV_KEY, dev->evbit);
 482         __set_bit(EV_ABS, dev->evbit);
 483         __clear_bit(EV_REL, dev->evbit);
 484
 485         __set_bit(BTN_LEFT, dev->keybit);
 486         __set_bit(BTN_RIGHT, dev->keybit);
 487
 488         __set_bit(BTN_TOUCH, dev->keybit);
 489         __set_bit(BTN_TOOL_FINGER, dev->keybit);
 490         __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
 491         __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
 492
 493         switch (etd->hw_version) {
 494         case 1:
 495                 /* Rocker button */
 496                 if (etd->fw_version < 0x020000 &&
 497                     (etd->capabilities & ETP_CAP_HAS_ROCKER)) {
 498                         __set_bit(BTN_FORWARD, dev->keybit);
 499                         __set_bit(BTN_BACK, dev->keybit);
 500                 }
 501                 input_set_abs_params(dev, ABS_X, ETP_XMIN_V1, ETP_XMAX_V1, 0, 0);
 502                 input_set_abs_params(dev, ABS_Y, ETP_YMIN_V1, ETP_YMAX_V1, 0, 0);
 503                 break;
 504
 505         case 2:
 506                 __set_bit(BTN_TOOL_QUADTAP, dev->keybit);
 507                 input_set_abs_params(dev, ABS_X, ETP_XMIN_V2, ETP_XMAX_V2, 0, 0);
 508                 input_set_abs_params(dev, ABS_Y, ETP_YMIN_V2, ETP_YMAX_V2, 0, 0);
 509                 if (etd->reports_pressure) {
 510                         input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
 511                                              ETP_PMAX_V2, 0, 0);
 512                         input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
 513                                              ETP_WMAX_V2, 0, 0);
 514                 }
 515                 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
 516                 input_mt_init_slots(dev, 2);
 517                 input_set_abs_params(dev, ABS_MT_POSITION_X, ETP_XMIN_V2, ETP_XMAX_V2, 0, 0);
 518                 input_set_abs_params(dev, ABS_MT_POSITION_Y, ETP_YMIN_V2, ETP_YMAX_V2, 0, 0);
 519                 break;
 520         }
 521 }
 522
 523 struct elantech_attr_data {
 524         size_t          field_offset;
 525         unsigned char   reg;
 526 };
 527
 528 /*
 529  * Display a register value by reading a sysfs entry
 530  */
 531 static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
 532                                         char *buf)
 533 {
 534         struct elantech_data *etd = psmouse->private;
 535         struct elantech_attr_data *attr = data;
 536         unsigned char *reg = (unsigned char *) etd + attr->field_offset;
 537         int rc = 0;
 538
 539         if (attr->reg)
 540                 rc = elantech_read_reg(psmouse, attr->reg, reg);
 541
 542         return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
 543 }
 544
 545 /*
 546  * Write a register value by writing a sysfs entry
 547  */
 548 static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
 549                                      void *data, const char *buf, size_t count)
 550 {
 551         struct elantech_data *etd = psmouse->private;
 552         struct elantech_attr_data *attr = data;
 553         unsigned char *reg = (unsigned char *) etd + attr->field_offset;
 554         unsigned long value;
 555         int err;
 556
 557         err = strict_strtoul(buf, 16, &value);
 558         if (err)
 559                 return err;
 560
 561         if (value > 0xff)
 562                 return -EINVAL;
 563
 564         /* Do we need to preserve some bits for version 2 hardware too? */
 565         if (etd->hw_version == 1) {
 566                 if (attr->reg == 0x10)
 567                         /* Force absolute mode always on */
 568                         value |= ETP_R10_ABSOLUTE_MODE;
 569                 else if (attr->reg == 0x11)
 570                         /* Force 4 byte mode always on */
 571                         value |= ETP_R11_4_BYTE_MODE;
 572         }
 573
 574         if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
 575                 *reg = value;
 576
 577         return count;
 578 }
 579
 580 #define ELANTECH_INT_ATTR(_name, _register)                             \
 581         static struct elantech_attr_data elantech_attr_##_name = {      \
 582                 .field_offset = offsetof(struct elantech_data, _name),  \
 583                 .reg = _register,                                       \
 584         };                                                              \
 585         PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO,                   \
 586                             &elantech_attr_##_name,                     \
 587                             elantech_show_int_attr,                     \
 588                             elantech_set_int_attr)
 589
 590 ELANTECH_INT_ATTR(reg_10, 0x10);
 591 ELANTECH_INT_ATTR(reg_11, 0x11);
 592 ELANTECH_INT_ATTR(reg_20, 0x20);
 593 ELANTECH_INT_ATTR(reg_21, 0x21);
 594 ELANTECH_INT_ATTR(reg_22, 0x22);
 595 ELANTECH_INT_ATTR(reg_23, 0x23);
 596 ELANTECH_INT_ATTR(reg_24, 0x24);
 597 ELANTECH_INT_ATTR(reg_25, 0x25);
 598 ELANTECH_INT_ATTR(reg_26, 0x26);
 599 ELANTECH_INT_ATTR(debug, 0);
 600 ELANTECH_INT_ATTR(paritycheck, 0);
 601
 602 static struct attribute *elantech_attrs[] = {
 603         &psmouse_attr_reg_10.dattr.attr,
 604         &psmouse_attr_reg_11.dattr.attr,
 605         &psmouse_attr_reg_20.dattr.attr,
 606         &psmouse_attr_reg_21.dattr.attr,
 607         &psmouse_attr_reg_22.dattr.attr,
 608         &psmouse_attr_reg_23.dattr.attr,
 609         &psmouse_attr_reg_24.dattr.attr,
 610         &psmouse_attr_reg_25.dattr.attr,
 611         &psmouse_attr_reg_26.dattr.attr,
 612         &psmouse_attr_debug.dattr.attr,
 613         &psmouse_attr_paritycheck.dattr.attr,
 614         NULL
 615 };
 616
 617 static struct attribute_group elantech_attr_group = {
 618         .attrs = elantech_attrs,
 619 };
 620
 621 static bool elantech_is_signature_valid(const unsigned char *param)
 622 {
 623         static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
 624         int i;
 625
 626         if (param[0] == 0)
 627                 return false;
 628
 629         if (param[1] == 0)
 630                 return true;
 631
 632         for (i = 0; i < ARRAY_SIZE(rates); i++)
 633                 if (param[2] == rates[i])
 634                         return false;
 635
 636         return true;
 637 }
 638
 639 /*
 640  * Use magic knock to detect Elantech touchpad
 641  */
 642 int elantech_detect(struct psmouse *psmouse, bool set_properties)
 643 {
 644         struct ps2dev *ps2dev = &psmouse->ps2dev;
 645         unsigned char param[3];
 646
 647         ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
 648
 649         if (ps2_command(ps2dev,  NULL, PSMOUSE_CMD_DISABLE) ||
 650             ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11) ||
 651             ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11) ||
 652             ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11) ||
 653             ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
 654                 pr_debug("sending Elantech magic knock failed.\n");
 655                 return -1;
 656         }
 657
 658         /*
 659          * Report this in case there are Elantech models that use a different
 660          * set of magic numbers
 661          */
 662         if (param[0] != 0x3c || param[1] != 0x03 || param[2] != 0xc8) {
 663                 pr_debug("unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
 664                          param[0], param[1], param[2]);
 665                 return -1;
 666         }
 667
 668         /*
 669          * Query touchpad's firmware version and see if it reports known
 670          * value to avoid mis-detection. Logitech mice are known to respond
 671          * to Elantech magic knock and there might be more.
 672          */
 673         if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
 674                 pr_debug("failed to query firmware version.\n");
 675                 return -1;
 676         }
 677
 678         pr_debug("Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
 679                  param[0], param[1], param[2]);
 680
 681         if (!elantech_is_signature_valid(param)) {
 682                 if (!force_elantech) {
 683                         pr_debug("Probably not a real Elantech touchpad. Aborting.\n");
 684                         return -1;
 685                 }
 686
 687                 pr_debug("Probably not a real Elantech touchpad. Enabling anyway due to force_elantech.\n");
 688         }
 689
 690         if (set_properties) {
 691                 psmouse->vendor = "Elantech";
 692                 psmouse->name = "Touchpad";
 693         }
 694
 695         return 0;
 696 }
 697
 698 /*
 699  * Clean up sysfs entries when disconnecting
 700  */
 701 static void elantech_disconnect(struct psmouse *psmouse)
 702 {
 703         sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
 704                            &elantech_attr_group);
 705         kfree(psmouse->private);
 706         psmouse->private = NULL;
 707 }
 708
 709 /*
 710  * Put the touchpad back into absolute mode when reconnecting
 711  */
 712 static int elantech_reconnect(struct psmouse *psmouse)
 713 {
 714         if (elantech_detect(psmouse, 0))
 715                 return -1;
 716
 717         if (elantech_set_absolute_mode(psmouse)) {
 718                 pr_err("failed to put touchpad back into absolute mode.\n");
 719                 return -1;
 720         }
 721
 722         return 0;
 723 }
 724
 725 /*
 726  * Initialize the touchpad and create sysfs entries
 727  */
 728 int elantech_init(struct psmouse *psmouse)
 729 {
 730         struct elantech_data *etd;
 731         int i, error;
 732         unsigned char param[3];
 733
 734         psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
 735         if (!etd)
 736                 return -ENOMEM;
 737
 738         etd->parity[0] = 1;
 739         for (i = 1; i < 256; i++)
 740                 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
 741
 742         /*
 743          * Do the version query again so we can store the result
 744          */
 745         if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
 746                 pr_err("failed to query firmware version.\n");
 747                 goto init_fail;
 748         }
 749
 750         etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
 751
 752         /*
 753          * Assume every version greater than this is new EeePC style
 754          * hardware with 6 byte packets
 755          */
 756         if (etd->fw_version >= 0x020030) {
 757                 etd->hw_version = 2;
 758                 /* For now show extra debug information */
 759                 etd->debug = 1;
 760                 /* Don't know how to do parity checking for version 2 */
 761                 etd->paritycheck = 0;
 762
 763                 if (etd->fw_version >= 0x020800)
 764                         etd->reports_pressure = true;
 765
 766         } else {
 767                 etd->hw_version = 1;
 768                 etd->paritycheck = 1;
 769         }
 770
 771         pr_info("assuming hardware version %d, firmware version %d.%d.%d\n",
 772                 etd->hw_version, param[0], param[1], param[2]);
 773
 774         if (synaptics_send_cmd(psmouse, ETP_CAPABILITIES_QUERY, param)) {
 775                 pr_err("failed to query capabilities.\n");
 776                 goto init_fail;
 777         }
 778         pr_info("Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
 779                 param[0], param[1], param[2]);
 780         etd->capabilities = param[0];
 781
 782         /*
 783          * This firmware suffers from misreporting coordinates when
 784          * a touch action starts causing the mouse cursor or scrolled page
 785          * to jump. Enable a workaround.
 786          */
 787         if (etd->fw_version == 0x020022 || etd->fw_version == 0x020600) {
 788                 pr_info("firmware version 2.0.34/2.6.0 detected, enabling jumpy cursor workaround\n");
 789                 etd->jumpy_cursor = true;
 790         }
 791
 792         if (elantech_set_absolute_mode(psmouse)) {
 793                 pr_err("failed to put touchpad into absolute mode.\n");
 794                 goto init_fail;
 795         }
 796
 797         elantech_set_input_params(psmouse);
 798
 799         error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
 800                                    &elantech_attr_group);
 801         if (error) {
 802                 pr_err("failed to create sysfs attributes, error: %d.\n", error);
 803                 goto init_fail;
 804         }
 805
 806         psmouse->protocol_handler = elantech_process_byte;
 807         psmouse->disconnect = elantech_disconnect;
 808         psmouse->reconnect = elantech_reconnect;
 809         psmouse->pktsize = etd->hw_version == 2 ? 6 : 4;
 810
 811         return 0;
 812
 813  init_fail:
 814         kfree(etd);
 815         return -1;
 816 }