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/serio.h> 20#include <linux/libps2.h> 21#include "psmouse.h" 22#include "elantech.h" 23 24#define elantech_debug(fmt, ...) \ 25 do { \ 26 if (etd->debug) \ 27 printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); \ 28 } while (0) 29 30static bool force_elantech; 31module_param_named(force_elantech, force_elantech, bool, 0644); 32MODULE_PARM_DESC(force_elantech, "Force the Elantech PS/2 protocol extension to be used, 1 = enabled, 0 = disabled (default)."); 33 34/* 35 * Send a Synaptics style sliced query command 36 */ 37static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c, 38 unsigned char *param) 39{ 40 if (psmouse_sliced_command(psmouse, c) || 41 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) { 42 pr_err("synaptics_send_cmd query 0x%02x failed.\n", c); 43 return -1; 44 } 45 46 return 0; 47} 48 49/* 50 * A retrying version of ps2_command 51 */ 52static int elantech_ps2_command(struct psmouse *psmouse, 53 unsigned char *param, int command) 54{ 55 struct ps2dev *ps2dev = &psmouse->ps2dev; 56 struct elantech_data *etd = psmouse->private; 57 int rc; 58 int tries = ETP_PS2_COMMAND_TRIES; 59 60 do { 61 rc = ps2_command(ps2dev, param, command); 62 if (rc == 0) 63 break; 64 tries--; 65 elantech_debug("retrying ps2 command 0x%02x (%d).\n", 66 command, tries); 67 msleep(ETP_PS2_COMMAND_DELAY); 68 } while (tries > 0); 69 70 if (rc) 71 pr_err("ps2 command 0x%02x failed.\n", command); 72 73 return rc; 74} 75 76/* 77 * Send an Elantech style special command to read a value from a register 78 */ 79static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg, 80 unsigned char *val) 81{ 82 struct elantech_data *etd = psmouse->private; 83 unsigned char param[3]; 84 int rc = 0; 85 86 if (reg < 0x10 || reg > 0x26) 87 return -1; 88 89 if (reg > 0x11 && reg < 0x20) 90 return -1; 91 92 switch (etd->hw_version) { 93 case 1: 94 if (psmouse_sliced_command(psmouse, ETP_REGISTER_READ) || 95 psmouse_sliced_command(psmouse, reg) || 96 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) { 97 rc = -1; 98 } 99 break; 100 101 case 2: 102 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 103 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READ) || 104 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 105 elantech_ps2_command(psmouse, NULL, reg) || 106 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) { 107 rc = -1; 108 } 109 break; 110 } 111 112 if (rc) 113 pr_err("failed to read register 0x%02x.\n", reg); 114 else 115 *val = param[0]; 116 117 return rc; 118} 119 120/* 121 * Send an Elantech style special command to write a register with a value 122 */ 123static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg, 124 unsigned char val) 125{ 126 struct elantech_data *etd = psmouse->private; 127 int rc = 0; 128 129 if (reg < 0x10 || reg > 0x26) 130 return -1; 131 132 if (reg > 0x11 && reg < 0x20) 133 return -1; 134 135 switch (etd->hw_version) { 136 case 1: 137 if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) || 138 psmouse_sliced_command(psmouse, reg) || 139 psmouse_sliced_command(psmouse, val) || 140 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) { 141 rc = -1; 142 } 143 break; 144 145 case 2: 146 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 147 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) || 148 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 149 elantech_ps2_command(psmouse, NULL, reg) || 150 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 151 elantech_ps2_command(psmouse, NULL, val) || 152 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) { 153 rc = -1; 154 } 155 break; 156 } 157 158 if (rc) 159 pr_err("failed to write register 0x%02x with value 0x%02x.\n", 160 reg, val); 161 162 return rc; 163} 164 165/* 166 * Dump a complete mouse movement packet to the syslog 167 */ 168static void elantech_packet_dump(unsigned char *packet, int size) 169{ 170 int i; 171 172 printk(KERN_DEBUG pr_fmt("PS/2 packet [")); 173 for (i = 0; i < size; i++) 174 printk("%s0x%02x ", (i) ? ", " : " ", packet[i]); 175 printk("]\n"); 176} 177 178/* 179 * Interpret complete data packets and report absolute mode input events for 180 * hardware version 1. (4 byte packets) 181 */ 182static void elantech_report_absolute_v1(struct psmouse *psmouse) 183{ 184 struct input_dev *dev = psmouse->dev; 185 struct elantech_data *etd = psmouse->private; 186 unsigned char *packet = psmouse->packet; 187 int fingers; 188 189 if (etd->fw_version < 0x020000) { 190 /* 191 * byte 0: D U p1 p2 1 p3 R L 192 * byte 1: f 0 th tw x9 x8 y9 y8 193 */ 194 fingers = ((packet[1] & 0x80) >> 7) + 195 ((packet[1] & 0x30) >> 4); 196 } else { 197 /* 198 * byte 0: n1 n0 p2 p1 1 p3 R L 199 * byte 1: 0 0 0 0 x9 x8 y9 y8 200 */ 201 fingers = (packet[0] & 0xc0) >> 6; 202 } 203 204 if (etd->jumpy_cursor) { 205 if (fingers != 1) { 206 etd->single_finger_reports = 0; 207 } else if (etd->single_finger_reports < 2) { 208 /* Discard first 2 reports of one finger, bogus */ 209 etd->single_finger_reports++; 210 elantech_debug("discarding packet\n"); 211 return; 212 } 213 } 214 215 input_report_key(dev, BTN_TOUCH, fingers != 0); 216 217 /* 218 * byte 2: x7 x6 x5 x4 x3 x2 x1 x0 219 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0 220 */ 221 if (fingers) { 222 input_report_abs(dev, ABS_X, 223 ((packet[1] & 0x0c) << 6) | packet[2]); 224 input_report_abs(dev, ABS_Y, 225 ETP_YMAX_V1 - (((packet[1] & 0x03) << 8) | packet[3])); 226 } 227 228 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1); 229 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2); 230 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3); 231 input_report_key(dev, BTN_LEFT, packet[0] & 0x01); 232 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02); 233 234 if (etd->fw_version < 0x020000 && 235 (etd->capabilities & ETP_CAP_HAS_ROCKER)) { 236 /* rocker up */ 237 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40); 238 /* rocker down */ 239 input_report_key(dev, BTN_BACK, packet[0] & 0x80); 240 } 241 242 input_sync(dev); 243} 244 245/* 246 * Interpret complete data packets and report absolute mode input events for 247 * hardware version 2. (6 byte packets) 248 */ 249static void elantech_report_absolute_v2(struct psmouse *psmouse) 250{ 251 struct input_dev *dev = psmouse->dev; 252 unsigned char *packet = psmouse->packet; 253 int fingers, x1, y1, x2, y2; 254 255 /* byte 0: n1 n0 . . . . R L */ 256 fingers = (packet[0] & 0xc0) >> 6; 257 input_report_key(dev, BTN_TOUCH, fingers != 0); 258 259 switch (fingers) { 260 case 3: 261 /* 262 * Same as one finger, except report of more than 3 fingers: 263 * byte 3: n4 . w1 w0 . . . . 264 */ 265 if (packet[3] & 0x80) 266 fingers = 4; 267 /* pass through... */ 268 case 1: 269 /* 270 * byte 1: . . . . . x10 x9 x8 271 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0 272 */ 273 input_report_abs(dev, ABS_X, 274 ((packet[1] & 0x07) << 8) | packet[2]); 275 /* 276 * byte 4: . . . . . . y9 y8 277 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0 278 */ 279 input_report_abs(dev, ABS_Y, 280 ETP_YMAX_V2 - (((packet[4] & 0x03) << 8) | packet[5])); 281 break; 282 283 case 2: 284 /* 285 * The coordinate of each finger is reported separately 286 * with a lower resolution for two finger touches: 287 * byte 0: . . ay8 ax8 . . . . 288 * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0 289 */ 290 x1 = ((packet[0] & 0x10) << 4) | packet[1]; 291 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */ 292 y1 = ETP_2FT_YMAX - (((packet[0] & 0x20) << 3) | packet[2]); 293 /* 294 * byte 3: . . by8 bx8 . . . . 295 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0 296 */ 297 x2 = ((packet[3] & 0x10) << 4) | packet[4]; 298 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */ 299 y2 = ETP_2FT_YMAX - (((packet[3] & 0x20) << 3) | packet[5]); 300 /* 301 * For compatibility with the X Synaptics driver scale up 302 * one coordinate and report as ordinary mouse movent 303 */ 304 input_report_abs(dev, ABS_X, x1 << 2); 305 input_report_abs(dev, ABS_Y, y1 << 2); 306 /* 307 * For compatibility with the proprietary X Elantech driver 308 * report both coordinates as hat coordinates 309 */ 310 input_report_abs(dev, ABS_HAT0X, x1); 311 input_report_abs(dev, ABS_HAT0Y, y1); 312 input_report_abs(dev, ABS_HAT1X, x2); 313 input_report_abs(dev, ABS_HAT1Y, y2); 314 break; 315 } 316 317 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1); 318 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2); 319 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3); 320 input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4); 321 input_report_key(dev, BTN_LEFT, packet[0] & 0x01); 322 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02); 323 324 input_sync(dev); 325} 326 327static int elantech_check_parity_v1(struct psmouse *psmouse) 328{ 329 struct elantech_data *etd = psmouse->private; 330 unsigned char *packet = psmouse->packet; 331 unsigned char p1, p2, p3; 332 333 /* Parity bits are placed differently */ 334 if (etd->fw_version < 0x020000) { 335 /* byte 0: D U p1 p2 1 p3 R L */ 336 p1 = (packet[0] & 0x20) >> 5; 337 p2 = (packet[0] & 0x10) >> 4; 338 } else { 339 /* byte 0: n1 n0 p2 p1 1 p3 R L */ 340 p1 = (packet[0] & 0x10) >> 4; 341 p2 = (packet[0] & 0x20) >> 5; 342 } 343 344 p3 = (packet[0] & 0x04) >> 2; 345 346 return etd->parity[packet[1]] == p1 && 347 etd->parity[packet[2]] == p2 && 348 etd->parity[packet[3]] == p3; 349} 350 351/* 352 * Process byte stream from mouse and handle complete packets 353 */ 354static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse) 355{ 356 struct elantech_data *etd = psmouse->private; 357 358 if (psmouse->pktcnt < psmouse->pktsize) 359 return PSMOUSE_GOOD_DATA; 360 361 if (etd->debug > 1) 362 elantech_packet_dump(psmouse->packet, psmouse->pktsize); 363 364 switch (etd->hw_version) { 365 case 1: 366 if (etd->paritycheck && !elantech_check_parity_v1(psmouse)) 367 return PSMOUSE_BAD_DATA; 368 369 elantech_report_absolute_v1(psmouse); 370 break; 371 372 case 2: 373 /* We don't know how to check parity in protocol v2 */ 374 elantech_report_absolute_v2(psmouse); 375 break; 376 } 377 378 return PSMOUSE_FULL_PACKET; 379} 380 381/* 382 * Put the touchpad into absolute mode 383 */ 384static int elantech_set_absolute_mode(struct psmouse *psmouse) 385{ 386 struct elantech_data *etd = psmouse->private; 387 unsigned char val; 388 int tries = ETP_READ_BACK_TRIES; 389 int rc = 0; 390 391 switch (etd->hw_version) { 392 case 1: 393 etd->reg_10 = 0x16; 394 etd->reg_11 = 0x8f; 395 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) || 396 elantech_write_reg(psmouse, 0x11, etd->reg_11)) { 397 rc = -1; 398 } 399 break; 400 401 case 2: 402 /* Windows driver values */ 403 etd->reg_10 = 0x54; 404 etd->reg_11 = 0x88; /* 0x8a */ 405 etd->reg_21 = 0x60; /* 0x00 */ 406 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) || 407 elantech_write_reg(psmouse, 0x11, etd->reg_11) || 408 elantech_write_reg(psmouse, 0x21, etd->reg_21)) { 409 rc = -1; 410 break; 411 } 412 } 413 414 if (rc == 0) { 415 /* 416 * Read back reg 0x10. For hardware version 1 we must make 417 * sure the absolute mode bit is set. For hardware version 2 418 * the touchpad is probably initalising and not ready until 419 * we read back the value we just wrote. 420 */ 421 do { 422 rc = elantech_read_reg(psmouse, 0x10, &val); 423 if (rc == 0) 424 break; 425 tries--; 426 elantech_debug("retrying read (%d).\n", tries); 427 msleep(ETP_READ_BACK_DELAY); 428 } while (tries > 0); 429 430 if (rc) { 431 pr_err("failed to read back register 0x10.\n"); 432 } else if (etd->hw_version == 1 && 433 !(val & ETP_R10_ABSOLUTE_MODE)) { 434 pr_err("touchpad refuses to switch to absolute mode.\n"); 435 rc = -1; 436 } 437 } 438 439 if (rc) 440 pr_err("failed to initialise registers.\n"); 441 442 return rc; 443} 444 445/* 446 * Set the appropriate event bits for the input subsystem 447 */ 448static void elantech_set_input_params(struct psmouse *psmouse) 449{ 450 struct input_dev *dev = psmouse->dev; 451 struct elantech_data *etd = psmouse->private; 452 453 __set_bit(EV_KEY, dev->evbit); 454 __set_bit(EV_ABS, dev->evbit); 455 __clear_bit(EV_REL, dev->evbit); 456 457 __set_bit(BTN_LEFT, dev->keybit); 458 __set_bit(BTN_RIGHT, dev->keybit); 459 460 __set_bit(BTN_TOUCH, dev->keybit); 461 __set_bit(BTN_TOOL_FINGER, dev->keybit); 462 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit); 463 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit); 464 465 switch (etd->hw_version) { 466 case 1: 467 /* Rocker button */ 468 if (etd->fw_version < 0x020000 && 469 (etd->capabilities & ETP_CAP_HAS_ROCKER)) { 470 __set_bit(BTN_FORWARD, dev->keybit); 471 __set_bit(BTN_BACK, dev->keybit); 472 } 473 input_set_abs_params(dev, ABS_X, ETP_XMIN_V1, ETP_XMAX_V1, 0, 0); 474 input_set_abs_params(dev, ABS_Y, ETP_YMIN_V1, ETP_YMAX_V1, 0, 0); 475 break; 476 477 case 2: 478 __set_bit(BTN_TOOL_QUADTAP, dev->keybit); 479 input_set_abs_params(dev, ABS_X, ETP_XMIN_V2, ETP_XMAX_V2, 0, 0); 480 input_set_abs_params(dev, ABS_Y, ETP_YMIN_V2, ETP_YMAX_V2, 0, 0); 481 input_set_abs_params(dev, ABS_HAT0X, ETP_2FT_XMIN, ETP_2FT_XMAX, 0, 0); 482 input_set_abs_params(dev, ABS_HAT0Y, ETP_2FT_YMIN, ETP_2FT_YMAX, 0, 0); 483 input_set_abs_params(dev, ABS_HAT1X, ETP_2FT_XMIN, ETP_2FT_XMAX, 0, 0); 484 input_set_abs_params(dev, ABS_HAT1Y, ETP_2FT_YMIN, ETP_2FT_YMAX, 0, 0); 485 break; 486 } 487} 488 489struct elantech_attr_data { 490 size_t field_offset; 491 unsigned char reg; 492}; 493 494/* 495 * Display a register value by reading a sysfs entry 496 */ 497static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data, 498 char *buf) 499{ 500 struct elantech_data *etd = psmouse->private; 501 struct elantech_attr_data *attr = data; 502 unsigned char *reg = (unsigned char *) etd + attr->field_offset; 503 int rc = 0; 504 505 if (attr->reg) 506 rc = elantech_read_reg(psmouse, attr->reg, reg); 507 508 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg); 509} 510 511/* 512 * Write a register value by writing a sysfs entry 513 */ 514static ssize_t elantech_set_int_attr(struct psmouse *psmouse, 515 void *data, const char *buf, size_t count) 516{ 517 struct elantech_data *etd = psmouse->private; 518 struct elantech_attr_data *attr = data; 519 unsigned char *reg = (unsigned char *) etd + attr->field_offset; 520 unsigned long value; 521 int err; 522 523 err = strict_strtoul(buf, 16, &value); 524 if (err) 525 return err; 526 527 if (value > 0xff) 528 return -EINVAL; 529 530 /* Do we need to preserve some bits for version 2 hardware too? */ 531 if (etd->hw_version == 1) { 532 if (attr->reg == 0x10) 533 /* Force absolute mode always on */ 534 value |= ETP_R10_ABSOLUTE_MODE; 535 else if (attr->reg == 0x11) 536 /* Force 4 byte mode always on */ 537 value |= ETP_R11_4_BYTE_MODE; 538 } 539 540 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0) 541 *reg = value; 542 543 return count; 544} 545 546#define ELANTECH_INT_ATTR(_name, _register) \ 547 static struct elantech_attr_data elantech_attr_##_name = { \ 548 .field_offset = offsetof(struct elantech_data, _name), \ 549 .reg = _register, \ 550 }; \ 551 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \ 552 &elantech_attr_##_name, \ 553 elantech_show_int_attr, \ 554 elantech_set_int_attr) 555 556ELANTECH_INT_ATTR(reg_10, 0x10); 557ELANTECH_INT_ATTR(reg_11, 0x11); 558ELANTECH_INT_ATTR(reg_20, 0x20); 559ELANTECH_INT_ATTR(reg_21, 0x21); 560ELANTECH_INT_ATTR(reg_22, 0x22); 561ELANTECH_INT_ATTR(reg_23, 0x23); 562ELANTECH_INT_ATTR(reg_24, 0x24); 563ELANTECH_INT_ATTR(reg_25, 0x25); 564ELANTECH_INT_ATTR(reg_26, 0x26); 565ELANTECH_INT_ATTR(debug, 0); 566ELANTECH_INT_ATTR(paritycheck, 0); 567 568static struct attribute *elantech_attrs[] = { 569 &psmouse_attr_reg_10.dattr.attr, 570 &psmouse_attr_reg_11.dattr.attr, 571 &psmouse_attr_reg_20.dattr.attr, 572 &psmouse_attr_reg_21.dattr.attr, 573 &psmouse_attr_reg_22.dattr.attr, 574 &psmouse_attr_reg_23.dattr.attr, 575 &psmouse_attr_reg_24.dattr.attr, 576 &psmouse_attr_reg_25.dattr.attr, 577 &psmouse_attr_reg_26.dattr.attr, 578 &psmouse_attr_debug.dattr.attr, 579 &psmouse_attr_paritycheck.dattr.attr, 580 NULL 581}; 582 583static struct attribute_group elantech_attr_group = { 584 .attrs = elantech_attrs, 585}; 586 587static bool elantech_is_signature_valid(const unsigned char *param) 588{ 589 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 }; 590 int i; 591 592 if (param[0] == 0) 593 return false; 594 595 if (param[1] == 0) 596 return true; 597 598 for (i = 0; i < ARRAY_SIZE(rates); i++) 599 if (param[2] == rates[i]) 600 return false; 601 602 return true; 603} 604 605/* 606 * Use magic knock to detect Elantech touchpad 607 */ 608int elantech_detect(struct psmouse *psmouse, bool set_properties) 609{ 610 struct ps2dev *ps2dev = &psmouse->ps2dev; 611 unsigned char param[3]; 612 613 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS); 614 615 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) || 616 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || 617 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || 618 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || 619 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) { 620 pr_debug("sending Elantech magic knock failed.\n"); 621 return -1; 622 } 623 624 /* 625 * Report this in case there are Elantech models that use a different 626 * set of magic numbers 627 */ 628 if (param[0] != 0x3c || param[1] != 0x03 || param[2] != 0xc8) { 629 pr_debug("unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n", 630 param[0], param[1], param[2]); 631 return -1; 632 } 633 634 /* 635 * Query touchpad's firmware version and see if it reports known 636 * value to avoid mis-detection. Logitech mice are known to respond 637 * to Elantech magic knock and there might be more. 638 */ 639 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) { 640 pr_debug("failed to query firmware version.\n"); 641 return -1; 642 } 643 644 pr_debug("Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n", 645 param[0], param[1], param[2]); 646 647 if (!elantech_is_signature_valid(param)) { 648 if (!force_elantech) { 649 pr_debug("Probably not a real Elantech touchpad. Aborting.\n"); 650 return -1; 651 } 652 653 pr_debug("Probably not a real Elantech touchpad. Enabling anyway due to force_elantech.\n"); 654 } 655 656 if (set_properties) { 657 psmouse->vendor = "Elantech"; 658 psmouse->name = "Touchpad"; 659 } 660 661 return 0; 662} 663 664/* 665 * Clean up sysfs entries when disconnecting 666 */ 667static void elantech_disconnect(struct psmouse *psmouse) 668{ 669 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, 670 &elantech_attr_group); 671 kfree(psmouse->private); 672 psmouse->private = NULL; 673} 674 675/* 676 * Put the touchpad back into absolute mode when reconnecting 677 */ 678static int elantech_reconnect(struct psmouse *psmouse) 679{ 680 if (elantech_detect(psmouse, 0)) 681 return -1; 682 683 if (elantech_set_absolute_mode(psmouse)) { 684 pr_err("failed to put touchpad back into absolute mode.\n"); 685 return -1; 686 } 687 688 return 0; 689} 690 691/* 692 * Initialize the touchpad and create sysfs entries 693 */ 694int elantech_init(struct psmouse *psmouse) 695{ 696 struct elantech_data *etd; 697 int i, error; 698 unsigned char param[3]; 699 700 psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL); 701 if (!etd) 702 return -1; 703 704 etd->parity[0] = 1; 705 for (i = 1; i < 256; i++) 706 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1; 707 708 /* 709 * Do the version query again so we can store the result 710 */ 711 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) { 712 pr_err("failed to query firmware version.\n"); 713 goto init_fail; 714 } 715 716 etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2]; 717 718 /* 719 * Assume every version greater than this is new EeePC style 720 * hardware with 6 byte packets 721 */ 722 if (etd->fw_version >= 0x020030) { 723 etd->hw_version = 2; 724 /* For now show extra debug information */ 725 etd->debug = 1; 726 /* Don't know how to do parity checking for version 2 */ 727 etd->paritycheck = 0; 728 } else { 729 etd->hw_version = 1; 730 etd->paritycheck = 1; 731 } 732 733 pr_info("assuming hardware version %d, firmware version %d.%d.%d\n", 734 etd->hw_version, param[0], param[1], param[2]); 735 736 if (synaptics_send_cmd(psmouse, ETP_CAPABILITIES_QUERY, param)) { 737 pr_err("failed to query capabilities.\n"); 738 goto init_fail; 739 } 740 pr_info("Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n", 741 param[0], param[1], param[2]); 742 etd->capabilities = param[0]; 743 744 if (etd->fw_version == 0x020022 || etd->fw_version == 0x020600) { 745 pr_info("firmware version 2.0.34/2.6.0 detected, enabling jumpy cursor workaround\n"); 746 etd->jumpy_cursor = true; 747 } 748 749 if (elantech_set_absolute_mode(psmouse)) { 750 pr_err("failed to put touchpad into absolute mode.\n"); 751 goto init_fail; 752 } 753 754 elantech_set_input_params(psmouse); 755 756 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj, 757 &elantech_attr_group); 758 if (error) { 759 pr_err("failed to create sysfs attributes, error: %d.\n", error); 760 goto init_fail; 761 } 762 763 psmouse->protocol_handler = elantech_process_byte; 764 psmouse->disconnect = elantech_disconnect; 765 psmouse->reconnect = elantech_reconnect; 766 psmouse->pktsize = etd->hw_version == 2 ? 6 : 4; 767 768 return 0; 769 770 init_fail: 771 kfree(etd); 772 return -1; 773} 774