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 #include <linux/delay.h> 14 #include <linux/slab.h> 15 #include <linux/module.h> 16 #include <linux/input.h> 17 #include <linux/input/mt.h> 18 #include <linux/serio.h> 19 #include <linux/libps2.h> 20 #include "psmouse.h" 21 #include "elantech.h" 22 23 #define elantech_debug(fmt, ...) \ 24 do { \ 25 if (etd->debug) \ 26 psmouse_printk(KERN_DEBUG, psmouse, \ 27 fmt, ##__VA_ARGS__); \ 28 } while (0) 29 30 /* 31 * Send a Synaptics style sliced query command 32 */ 33 static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c, 34 unsigned char *param) 35 { 36 if (psmouse_sliced_command(psmouse, c) || 37 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) { 38 psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c); 39 return -1; 40 } 41 42 return 0; 43 } 44 45 /* 46 * V3 and later support this fast command 47 */ 48 static int elantech_send_cmd(struct psmouse *psmouse, unsigned char c, 49 unsigned char *param) 50 { 51 struct ps2dev *ps2dev = &psmouse->ps2dev; 52 53 if (ps2_command(ps2dev, NULL, ETP_PS2_CUSTOM_COMMAND) || 54 ps2_command(ps2dev, NULL, c) || 55 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) { 56 psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c); 57 return -1; 58 } 59 60 return 0; 61 } 62 63 /* 64 * A retrying version of ps2_command 65 */ 66 static int elantech_ps2_command(struct psmouse *psmouse, 67 unsigned char *param, int command) 68 { 69 struct ps2dev *ps2dev = &psmouse->ps2dev; 70 struct elantech_data *etd = psmouse->private; 71 int rc; 72 int tries = ETP_PS2_COMMAND_TRIES; 73 74 do { 75 rc = ps2_command(ps2dev, param, command); 76 if (rc == 0) 77 break; 78 tries--; 79 elantech_debug("retrying ps2 command 0x%02x (%d).\n", 80 command, tries); 81 msleep(ETP_PS2_COMMAND_DELAY); 82 } while (tries > 0); 83 84 if (rc) 85 psmouse_err(psmouse, "ps2 command 0x%02x failed.\n", command); 86 87 return rc; 88 } 89 90 /* 91 * Send an Elantech style special command to read a value from a register 92 */ 93 static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg, 94 unsigned char *val) 95 { 96 struct elantech_data *etd = psmouse->private; 97 unsigned char param[3]; 98 int rc = 0; 99 100 if (reg < 0x07 || reg > 0x26) 101 return -1; 102 103 if (reg > 0x11 && reg < 0x20) 104 return -1; 105 106 switch (etd->hw_version) { 107 case 1: 108 if (psmouse_sliced_command(psmouse, ETP_REGISTER_READ) || 109 psmouse_sliced_command(psmouse, reg) || 110 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) { 111 rc = -1; 112 } 113 break; 114 115 case 2: 116 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 117 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READ) || 118 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 119 elantech_ps2_command(psmouse, NULL, reg) || 120 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) { 121 rc = -1; 122 } 123 break; 124 125 case 3 ... 4: 126 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 127 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) || 128 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 129 elantech_ps2_command(psmouse, NULL, reg) || 130 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) { 131 rc = -1; 132 } 133 break; 134 } 135 136 if (rc) 137 psmouse_err(psmouse, "failed to read register 0x%02x.\n", reg); 138 else if (etd->hw_version != 4) 139 *val = param[0]; 140 else 141 *val = param[1]; 142 143 return rc; 144 } 145 146 /* 147 * Send an Elantech style special command to write a register with a value 148 */ 149 static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg, 150 unsigned char val) 151 { 152 struct elantech_data *etd = psmouse->private; 153 int rc = 0; 154 155 if (reg < 0x07 || reg > 0x26) 156 return -1; 157 158 if (reg > 0x11 && reg < 0x20) 159 return -1; 160 161 switch (etd->hw_version) { 162 case 1: 163 if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) || 164 psmouse_sliced_command(psmouse, reg) || 165 psmouse_sliced_command(psmouse, val) || 166 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) { 167 rc = -1; 168 } 169 break; 170 171 case 2: 172 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 173 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) || 174 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 175 elantech_ps2_command(psmouse, NULL, reg) || 176 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 177 elantech_ps2_command(psmouse, NULL, val) || 178 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) { 179 rc = -1; 180 } 181 break; 182 183 case 3: 184 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 185 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) || 186 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 187 elantech_ps2_command(psmouse, NULL, reg) || 188 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 189 elantech_ps2_command(psmouse, NULL, val) || 190 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) { 191 rc = -1; 192 } 193 break; 194 195 case 4: 196 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 197 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) || 198 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 199 elantech_ps2_command(psmouse, NULL, reg) || 200 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 201 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) || 202 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 203 elantech_ps2_command(psmouse, NULL, val) || 204 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) { 205 rc = -1; 206 } 207 break; 208 } 209 210 if (rc) 211 psmouse_err(psmouse, 212 "failed to write register 0x%02x with value 0x%02x.\n", 213 reg, val); 214 215 return rc; 216 } 217 218 /* 219 * Dump a complete mouse movement packet to the syslog 220 */ 221 static void elantech_packet_dump(struct psmouse *psmouse) 222 { 223 int i; 224 225 psmouse_printk(KERN_DEBUG, psmouse, "PS/2 packet ["); 226 for (i = 0; i < psmouse->pktsize; i++) 227 printk("%s0x%02x ", i ? ", " : " ", psmouse->packet[i]); 228 printk("]\n"); 229 } 230 231 /* 232 * Interpret complete data packets and report absolute mode input events for 233 * hardware version 1. (4 byte packets) 234 */ 235 static void elantech_report_absolute_v1(struct psmouse *psmouse) 236 { 237 struct input_dev *dev = psmouse->dev; 238 struct elantech_data *etd = psmouse->private; 239 unsigned char *packet = psmouse->packet; 240 int fingers; 241 242 if (etd->fw_version < 0x020000) { 243 /* 244 * byte 0: D U p1 p2 1 p3 R L 245 * byte 1: f 0 th tw x9 x8 y9 y8 246 */ 247 fingers = ((packet[1] & 0x80) >> 7) + 248 ((packet[1] & 0x30) >> 4); 249 } else { 250 /* 251 * byte 0: n1 n0 p2 p1 1 p3 R L 252 * byte 1: 0 0 0 0 x9 x8 y9 y8 253 */ 254 fingers = (packet[0] & 0xc0) >> 6; 255 } 256 257 if (etd->jumpy_cursor) { 258 if (fingers != 1) { 259 etd->single_finger_reports = 0; 260 } else if (etd->single_finger_reports < 2) { 261 /* Discard first 2 reports of one finger, bogus */ 262 etd->single_finger_reports++; 263 elantech_debug("discarding packet\n"); 264 return; 265 } 266 } 267 268 input_report_key(dev, BTN_TOUCH, fingers != 0); 269 270 /* 271 * byte 2: x7 x6 x5 x4 x3 x2 x1 x0 272 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0 273 */ 274 if (fingers) { 275 input_report_abs(dev, ABS_X, 276 ((packet[1] & 0x0c) << 6) | packet[2]); 277 input_report_abs(dev, ABS_Y, 278 etd->y_max - (((packet[1] & 0x03) << 8) | packet[3])); 279 } 280 281 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1); 282 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2); 283 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3); 284 input_report_key(dev, BTN_LEFT, packet[0] & 0x01); 285 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02); 286 287 if (etd->fw_version < 0x020000 && 288 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) { 289 /* rocker up */ 290 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40); 291 /* rocker down */ 292 input_report_key(dev, BTN_BACK, packet[0] & 0x80); 293 } 294 295 input_sync(dev); 296 } 297 298 static void elantech_set_slot(struct input_dev *dev, int slot, bool active, 299 unsigned int x, unsigned int y) 300 { 301 input_mt_slot(dev, slot); 302 input_mt_report_slot_state(dev, MT_TOOL_FINGER, active); 303 if (active) { 304 input_report_abs(dev, ABS_MT_POSITION_X, x); 305 input_report_abs(dev, ABS_MT_POSITION_Y, y); 306 } 307 } 308 309 /* x1 < x2 and y1 < y2 when two fingers, x = y = 0 when not pressed */ 310 static void elantech_report_semi_mt_data(struct input_dev *dev, 311 unsigned int num_fingers, 312 unsigned int x1, unsigned int y1, 313 unsigned int x2, unsigned int y2) 314 { 315 elantech_set_slot(dev, 0, num_fingers != 0, x1, y1); 316 elantech_set_slot(dev, 1, num_fingers == 2, x2, y2); 317 } 318 319 /* 320 * Interpret complete data packets and report absolute mode input events for 321 * hardware version 2. (6 byte packets) 322 */ 323 static void elantech_report_absolute_v2(struct psmouse *psmouse) 324 { 325 struct elantech_data *etd = psmouse->private; 326 struct input_dev *dev = psmouse->dev; 327 unsigned char *packet = psmouse->packet; 328 unsigned int fingers, x1 = 0, y1 = 0, x2 = 0, y2 = 0; 329 unsigned int width = 0, pres = 0; 330 331 /* byte 0: n1 n0 . . . . R L */ 332 fingers = (packet[0] & 0xc0) >> 6; 333 334 switch (fingers) { 335 case 3: 336 /* 337 * Same as one finger, except report of more than 3 fingers: 338 * byte 3: n4 . w1 w0 . . . . 339 */ 340 if (packet[3] & 0x80) 341 fingers = 4; 342 /* pass through... */ 343 case 1: 344 /* 345 * byte 1: . . . . x11 x10 x9 x8 346 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0 347 */ 348 x1 = ((packet[1] & 0x0f) << 8) | packet[2]; 349 /* 350 * byte 4: . . . . y11 y10 y9 y8 351 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0 352 */ 353 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]); 354 355 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4); 356 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4); 357 break; 358 359 case 2: 360 /* 361 * The coordinate of each finger is reported separately 362 * with a lower resolution for two finger touches: 363 * byte 0: . . ay8 ax8 . . . . 364 * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0 365 */ 366 x1 = (((packet[0] & 0x10) << 4) | packet[1]) << 2; 367 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */ 368 y1 = etd->y_max - 369 ((((packet[0] & 0x20) << 3) | packet[2]) << 2); 370 /* 371 * byte 3: . . by8 bx8 . . . . 372 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0 373 */ 374 x2 = (((packet[3] & 0x10) << 4) | packet[4]) << 2; 375 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */ 376 y2 = etd->y_max - 377 ((((packet[3] & 0x20) << 3) | packet[5]) << 2); 378 379 /* Unknown so just report sensible values */ 380 pres = 127; 381 width = 7; 382 break; 383 } 384 385 input_report_key(dev, BTN_TOUCH, fingers != 0); 386 if (fingers != 0) { 387 input_report_abs(dev, ABS_X, x1); 388 input_report_abs(dev, ABS_Y, y1); 389 } 390 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2); 391 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1); 392 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2); 393 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3); 394 input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4); 395 input_report_key(dev, BTN_LEFT, packet[0] & 0x01); 396 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02); 397 if (etd->reports_pressure) { 398 input_report_abs(dev, ABS_PRESSURE, pres); 399 input_report_abs(dev, ABS_TOOL_WIDTH, width); 400 } 401 402 input_sync(dev); 403 } 404 405 /* 406 * Interpret complete data packets and report absolute mode input events for 407 * hardware version 3. (12 byte packets for two fingers) 408 */ 409 static void elantech_report_absolute_v3(struct psmouse *psmouse, 410 int packet_type) 411 { 412 struct input_dev *dev = psmouse->dev; 413 struct elantech_data *etd = psmouse->private; 414 unsigned char *packet = psmouse->packet; 415 unsigned int fingers = 0, x1 = 0, y1 = 0, x2 = 0, y2 = 0; 416 unsigned int width = 0, pres = 0; 417 418 /* byte 0: n1 n0 . . . . R L */ 419 fingers = (packet[0] & 0xc0) >> 6; 420 421 switch (fingers) { 422 case 3: 423 case 1: 424 /* 425 * byte 1: . . . . x11 x10 x9 x8 426 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0 427 */ 428 x1 = ((packet[1] & 0x0f) << 8) | packet[2]; 429 /* 430 * byte 4: . . . . y11 y10 y9 y8 431 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0 432 */ 433 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]); 434 break; 435 436 case 2: 437 if (packet_type == PACKET_V3_HEAD) { 438 /* 439 * byte 1: . . . . ax11 ax10 ax9 ax8 440 * byte 2: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0 441 */ 442 etd->mt[0].x = ((packet[1] & 0x0f) << 8) | packet[2]; 443 /* 444 * byte 4: . . . . ay11 ay10 ay9 ay8 445 * byte 5: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 446 */ 447 etd->mt[0].y = etd->y_max - 448 (((packet[4] & 0x0f) << 8) | packet[5]); 449 /* 450 * wait for next packet 451 */ 452 return; 453 } 454 455 /* packet_type == PACKET_V3_TAIL */ 456 x1 = etd->mt[0].x; 457 y1 = etd->mt[0].y; 458 x2 = ((packet[1] & 0x0f) << 8) | packet[2]; 459 y2 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]); 460 break; 461 } 462 463 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4); 464 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4); 465 466 input_report_key(dev, BTN_TOUCH, fingers != 0); 467 if (fingers != 0) { 468 input_report_abs(dev, ABS_X, x1); 469 input_report_abs(dev, ABS_Y, y1); 470 } 471 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2); 472 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1); 473 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2); 474 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3); 475 input_report_key(dev, BTN_LEFT, packet[0] & 0x01); 476 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02); 477 input_report_abs(dev, ABS_PRESSURE, pres); 478 input_report_abs(dev, ABS_TOOL_WIDTH, width); 479 480 input_sync(dev); 481 } 482 483 static void elantech_input_sync_v4(struct psmouse *psmouse) 484 { 485 struct input_dev *dev = psmouse->dev; 486 unsigned char *packet = psmouse->packet; 487 488 input_report_key(dev, BTN_LEFT, packet[0] & 0x01); 489 input_report_key(dev, BTN_RIGHT, packet[0] & 0x02); 490 input_mt_report_pointer_emulation(dev, true); 491 input_sync(dev); 492 } 493 494 static void process_packet_status_v4(struct psmouse *psmouse) 495 { 496 struct input_dev *dev = psmouse->dev; 497 unsigned char *packet = psmouse->packet; 498 unsigned fingers; 499 int i; 500 501 /* notify finger state change */ 502 fingers = packet[1] & 0x1f; 503 for (i = 0; i < ETP_MAX_FINGERS; i++) { 504 if ((fingers & (1 << i)) == 0) { 505 input_mt_slot(dev, i); 506 input_mt_report_slot_state(dev, MT_TOOL_FINGER, false); 507 } 508 } 509 510 elantech_input_sync_v4(psmouse); 511 } 512 513 static void process_packet_head_v4(struct psmouse *psmouse) 514 { 515 struct input_dev *dev = psmouse->dev; 516 struct elantech_data *etd = psmouse->private; 517 unsigned char *packet = psmouse->packet; 518 int id = ((packet[3] & 0xe0) >> 5) - 1; 519 int pres, traces; 520 521 if (id < 0) 522 return; 523 524 etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2]; 525 etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]); 526 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4); 527 traces = (packet[0] & 0xf0) >> 4; 528 529 input_mt_slot(dev, id); 530 input_mt_report_slot_state(dev, MT_TOOL_FINGER, true); 531 532 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x); 533 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y); 534 input_report_abs(dev, ABS_MT_PRESSURE, pres); 535 input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->width); 536 /* report this for backwards compatibility */ 537 input_report_abs(dev, ABS_TOOL_WIDTH, traces); 538 539 elantech_input_sync_v4(psmouse); 540 } 541 542 static void process_packet_motion_v4(struct psmouse *psmouse) 543 { 544 struct input_dev *dev = psmouse->dev; 545 struct elantech_data *etd = psmouse->private; 546 unsigned char *packet = psmouse->packet; 547 int weight, delta_x1 = 0, delta_y1 = 0, delta_x2 = 0, delta_y2 = 0; 548 int id, sid; 549 550 id = ((packet[0] & 0xe0) >> 5) - 1; 551 if (id < 0) 552 return; 553 554 sid = ((packet[3] & 0xe0) >> 5) - 1; 555 weight = (packet[0] & 0x10) ? ETP_WEIGHT_VALUE : 1; 556 /* 557 * Motion packets give us the delta of x, y values of specific fingers, 558 * but in two's complement. Let the compiler do the conversion for us. 559 * Also _enlarge_ the numbers to int, in case of overflow. 560 */ 561 delta_x1 = (signed char)packet[1]; 562 delta_y1 = (signed char)packet[2]; 563 delta_x2 = (signed char)packet[4]; 564 delta_y2 = (signed char)packet[5]; 565 566 etd->mt[id].x += delta_x1 * weight; 567 etd->mt[id].y -= delta_y1 * weight; 568 input_mt_slot(dev, id); 569 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x); 570 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y); 571 572 if (sid >= 0) { 573 etd->mt[sid].x += delta_x2 * weight; 574 etd->mt[sid].y -= delta_y2 * weight; 575 input_mt_slot(dev, sid); 576 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[sid].x); 577 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[sid].y); 578 } 579 580 elantech_input_sync_v4(psmouse); 581 } 582 583 static void elantech_report_absolute_v4(struct psmouse *psmouse, 584 int packet_type) 585 { 586 switch (packet_type) { 587 case PACKET_V4_STATUS: 588 process_packet_status_v4(psmouse); 589 break; 590 591 case PACKET_V4_HEAD: 592 process_packet_head_v4(psmouse); 593 break; 594 595 case PACKET_V4_MOTION: 596 process_packet_motion_v4(psmouse); 597 break; 598 599 case PACKET_UNKNOWN: 600 default: 601 /* impossible to get here */ 602 break; 603 } 604 } 605 606 static int elantech_packet_check_v1(struct psmouse *psmouse) 607 { 608 struct elantech_data *etd = psmouse->private; 609 unsigned char *packet = psmouse->packet; 610 unsigned char p1, p2, p3; 611 612 /* Parity bits are placed differently */ 613 if (etd->fw_version < 0x020000) { 614 /* byte 0: D U p1 p2 1 p3 R L */ 615 p1 = (packet[0] & 0x20) >> 5; 616 p2 = (packet[0] & 0x10) >> 4; 617 } else { 618 /* byte 0: n1 n0 p2 p1 1 p3 R L */ 619 p1 = (packet[0] & 0x10) >> 4; 620 p2 = (packet[0] & 0x20) >> 5; 621 } 622 623 p3 = (packet[0] & 0x04) >> 2; 624 625 return etd->parity[packet[1]] == p1 && 626 etd->parity[packet[2]] == p2 && 627 etd->parity[packet[3]] == p3; 628 } 629 630 static int elantech_debounce_check_v2(struct psmouse *psmouse) 631 { 632 /* 633 * When we encounter packet that matches this exactly, it means the 634 * hardware is in debounce status. Just ignore the whole packet. 635 */ 636 const u8 debounce_packet[] = { 0x84, 0xff, 0xff, 0x02, 0xff, 0xff }; 637 unsigned char *packet = psmouse->packet; 638 639 return !memcmp(packet, debounce_packet, sizeof(debounce_packet)); 640 } 641 642 static int elantech_packet_check_v2(struct psmouse *psmouse) 643 { 644 struct elantech_data *etd = psmouse->private; 645 unsigned char *packet = psmouse->packet; 646 647 /* 648 * V2 hardware has two flavors. Older ones that do not report pressure, 649 * and newer ones that reports pressure and width. With newer ones, all 650 * packets (1, 2, 3 finger touch) have the same constant bits. With 651 * older ones, 1/3 finger touch packets and 2 finger touch packets 652 * have different constant bits. 653 * With all three cases, if the constant bits are not exactly what I 654 * expected, I consider them invalid. 655 */ 656 if (etd->reports_pressure) 657 return (packet[0] & 0x0c) == 0x04 && 658 (packet[3] & 0x0f) == 0x02; 659 660 if ((packet[0] & 0xc0) == 0x80) 661 return (packet[0] & 0x0c) == 0x0c && 662 (packet[3] & 0x0e) == 0x08; 663 664 return (packet[0] & 0x3c) == 0x3c && 665 (packet[1] & 0xf0) == 0x00 && 666 (packet[3] & 0x3e) == 0x38 && 667 (packet[4] & 0xf0) == 0x00; 668 } 669 670 /* 671 * We check the constant bits to determine what packet type we get, 672 * so packet checking is mandatory for v3 and later hardware. 673 */ 674 static int elantech_packet_check_v3(struct psmouse *psmouse) 675 { 676 const u8 debounce_packet[] = { 0xc4, 0xff, 0xff, 0x02, 0xff, 0xff }; 677 unsigned char *packet = psmouse->packet; 678 679 /* 680 * check debounce first, it has the same signature in byte 0 681 * and byte 3 as PACKET_V3_HEAD. 682 */ 683 if (!memcmp(packet, debounce_packet, sizeof(debounce_packet))) 684 return PACKET_DEBOUNCE; 685 686 if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0xcf) == 0x02) 687 return PACKET_V3_HEAD; 688 689 if ((packet[0] & 0x0c) == 0x0c && (packet[3] & 0xce) == 0x0c) 690 return PACKET_V3_TAIL; 691 692 return PACKET_UNKNOWN; 693 } 694 695 static int elantech_packet_check_v4(struct psmouse *psmouse) 696 { 697 unsigned char *packet = psmouse->packet; 698 699 if ((packet[0] & 0x0c) == 0x04 && 700 (packet[3] & 0x1f) == 0x11) 701 return PACKET_V4_HEAD; 702 703 if ((packet[0] & 0x0c) == 0x04 && 704 (packet[3] & 0x1f) == 0x12) 705 return PACKET_V4_MOTION; 706 707 if ((packet[0] & 0x0c) == 0x04 && 708 (packet[3] & 0x1f) == 0x10) 709 return PACKET_V4_STATUS; 710 711 return PACKET_UNKNOWN; 712 } 713 714 /* 715 * Process byte stream from mouse and handle complete packets 716 */ 717 static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse) 718 { 719 struct elantech_data *etd = psmouse->private; 720 int packet_type; 721 722 if (psmouse->pktcnt < psmouse->pktsize) 723 return PSMOUSE_GOOD_DATA; 724 725 if (etd->debug > 1) 726 elantech_packet_dump(psmouse); 727 728 switch (etd->hw_version) { 729 case 1: 730 if (etd->paritycheck && !elantech_packet_check_v1(psmouse)) 731 return PSMOUSE_BAD_DATA; 732 733 elantech_report_absolute_v1(psmouse); 734 break; 735 736 case 2: 737 /* ignore debounce */ 738 if (elantech_debounce_check_v2(psmouse)) 739 return PSMOUSE_FULL_PACKET; 740 741 if (etd->paritycheck && !elantech_packet_check_v2(psmouse)) 742 return PSMOUSE_BAD_DATA; 743 744 elantech_report_absolute_v2(psmouse); 745 break; 746 747 case 3: 748 packet_type = elantech_packet_check_v3(psmouse); 749 /* ignore debounce */ 750 if (packet_type == PACKET_DEBOUNCE) 751 return PSMOUSE_FULL_PACKET; 752 753 if (packet_type == PACKET_UNKNOWN) 754 return PSMOUSE_BAD_DATA; 755 756 elantech_report_absolute_v3(psmouse, packet_type); 757 break; 758 759 case 4: 760 packet_type = elantech_packet_check_v4(psmouse); 761 if (packet_type == PACKET_UNKNOWN) 762 return PSMOUSE_BAD_DATA; 763 764 elantech_report_absolute_v4(psmouse, packet_type); 765 break; 766 } 767 768 return PSMOUSE_FULL_PACKET; 769 } 770 771 /* 772 * Put the touchpad into absolute mode 773 */ 774 static int elantech_set_absolute_mode(struct psmouse *psmouse) 775 { 776 struct elantech_data *etd = psmouse->private; 777 unsigned char val; 778 int tries = ETP_READ_BACK_TRIES; 779 int rc = 0; 780 781 switch (etd->hw_version) { 782 case 1: 783 etd->reg_10 = 0x16; 784 etd->reg_11 = 0x8f; 785 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) || 786 elantech_write_reg(psmouse, 0x11, etd->reg_11)) { 787 rc = -1; 788 } 789 break; 790 791 case 2: 792 /* Windows driver values */ 793 etd->reg_10 = 0x54; 794 etd->reg_11 = 0x88; /* 0x8a */ 795 etd->reg_21 = 0x60; /* 0x00 */ 796 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) || 797 elantech_write_reg(psmouse, 0x11, etd->reg_11) || 798 elantech_write_reg(psmouse, 0x21, etd->reg_21)) { 799 rc = -1; 800 } 801 break; 802 803 case 3: 804 etd->reg_10 = 0x0b; 805 if (elantech_write_reg(psmouse, 0x10, etd->reg_10)) 806 rc = -1; 807 808 break; 809 810 case 4: 811 etd->reg_07 = 0x01; 812 if (elantech_write_reg(psmouse, 0x07, etd->reg_07)) 813 rc = -1; 814 815 goto skip_readback_reg_10; /* v4 has no reg 0x10 to read */ 816 } 817 818 if (rc == 0) { 819 /* 820 * Read back reg 0x10. For hardware version 1 we must make 821 * sure the absolute mode bit is set. For hardware version 2 822 * the touchpad is probably initializing and not ready until 823 * we read back the value we just wrote. 824 */ 825 do { 826 rc = elantech_read_reg(psmouse, 0x10, &val); 827 if (rc == 0) 828 break; 829 tries--; 830 elantech_debug("retrying read (%d).\n", tries); 831 msleep(ETP_READ_BACK_DELAY); 832 } while (tries > 0); 833 834 if (rc) { 835 psmouse_err(psmouse, 836 "failed to read back register 0x10.\n"); 837 } else if (etd->hw_version == 1 && 838 !(val & ETP_R10_ABSOLUTE_MODE)) { 839 psmouse_err(psmouse, 840 "touchpad refuses to switch to absolute mode.\n"); 841 rc = -1; 842 } 843 } 844 845 skip_readback_reg_10: 846 if (rc) 847 psmouse_err(psmouse, "failed to initialise registers.\n"); 848 849 return rc; 850 } 851 852 static int elantech_set_range(struct psmouse *psmouse, 853 unsigned int *x_min, unsigned int *y_min, 854 unsigned int *x_max, unsigned int *y_max, 855 unsigned int *width) 856 { 857 struct elantech_data *etd = psmouse->private; 858 unsigned char param[3]; 859 unsigned char traces; 860 861 switch (etd->hw_version) { 862 case 1: 863 *x_min = ETP_XMIN_V1; 864 *y_min = ETP_YMIN_V1; 865 *x_max = ETP_XMAX_V1; 866 *y_max = ETP_YMAX_V1; 867 break; 868 869 case 2: 870 if (etd->fw_version == 0x020800 || 871 etd->fw_version == 0x020b00 || 872 etd->fw_version == 0x020030) { 873 *x_min = ETP_XMIN_V2; 874 *y_min = ETP_YMIN_V2; 875 *x_max = ETP_XMAX_V2; 876 *y_max = ETP_YMAX_V2; 877 } else { 878 int i; 879 int fixed_dpi; 880 881 i = (etd->fw_version > 0x020800 && 882 etd->fw_version < 0x020900) ? 1 : 2; 883 884 if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param)) 885 return -1; 886 887 fixed_dpi = param[1] & 0x10; 888 889 if (((etd->fw_version >> 16) == 0x14) && fixed_dpi) { 890 if (etd->send_cmd(psmouse, ETP_SAMPLE_QUERY, param)) 891 return -1; 892 893 *x_max = (etd->capabilities[1] - i) * param[1] / 2; 894 *y_max = (etd->capabilities[2] - i) * param[2] / 2; 895 } else if (etd->fw_version == 0x040216) { 896 *x_max = 819; 897 *y_max = 405; 898 } else if (etd->fw_version == 0x040219 || etd->fw_version == 0x040215) { 899 *x_max = 900; 900 *y_max = 500; 901 } else { 902 *x_max = (etd->capabilities[1] - i) * 64; 903 *y_max = (etd->capabilities[2] - i) * 64; 904 } 905 } 906 break; 907 908 case 3: 909 if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param)) 910 return -1; 911 912 *x_max = (0x0f & param[0]) << 8 | param[1]; 913 *y_max = (0xf0 & param[0]) << 4 | param[2]; 914 break; 915 916 case 4: 917 if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param)) 918 return -1; 919 920 *x_max = (0x0f & param[0]) << 8 | param[1]; 921 *y_max = (0xf0 & param[0]) << 4 | param[2]; 922 traces = etd->capabilities[1]; 923 if ((traces < 2) || (traces > *x_max)) 924 return -1; 925 926 *width = *x_max / (traces - 1); 927 break; 928 } 929 930 return 0; 931 } 932 933 /* 934 * (value from firmware) * 10 + 790 = dpi 935 * we also have to convert dpi to dots/mm (*10/254 to avoid floating point) 936 */ 937 static unsigned int elantech_convert_res(unsigned int val) 938 { 939 return (val * 10 + 790) * 10 / 254; 940 } 941 942 static int elantech_get_resolution_v4(struct psmouse *psmouse, 943 unsigned int *x_res, 944 unsigned int *y_res) 945 { 946 unsigned char param[3]; 947 948 if (elantech_send_cmd(psmouse, ETP_RESOLUTION_QUERY, param)) 949 return -1; 950 951 *x_res = elantech_convert_res(param[1] & 0x0f); 952 *y_res = elantech_convert_res((param[1] & 0xf0) >> 4); 953 954 return 0; 955 } 956 957 /* 958 * Set the appropriate event bits for the input subsystem 959 */ 960 static int elantech_set_input_params(struct psmouse *psmouse) 961 { 962 struct input_dev *dev = psmouse->dev; 963 struct elantech_data *etd = psmouse->private; 964 unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0; 965 unsigned int x_res = 0, y_res = 0; 966 967 if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width)) 968 return -1; 969 970 __set_bit(EV_KEY, dev->evbit); 971 __set_bit(EV_ABS, dev->evbit); 972 __clear_bit(EV_REL, dev->evbit); 973 974 __set_bit(BTN_LEFT, dev->keybit); 975 __set_bit(BTN_RIGHT, dev->keybit); 976 977 __set_bit(BTN_TOUCH, dev->keybit); 978 __set_bit(BTN_TOOL_FINGER, dev->keybit); 979 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit); 980 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit); 981 982 switch (etd->hw_version) { 983 case 1: 984 /* Rocker button */ 985 if (etd->fw_version < 0x020000 && 986 (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) { 987 __set_bit(BTN_FORWARD, dev->keybit); 988 __set_bit(BTN_BACK, dev->keybit); 989 } 990 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0); 991 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0); 992 break; 993 994 case 2: 995 __set_bit(BTN_TOOL_QUADTAP, dev->keybit); 996 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit); 997 /* fall through */ 998 case 3: 999 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0); 1000 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0); 1001 if (etd->reports_pressure) { 1002 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2, 1003 ETP_PMAX_V2, 0, 0); 1004 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2, 1005 ETP_WMAX_V2, 0, 0); 1006 } 1007 input_mt_init_slots(dev, 2); 1008 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0); 1009 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0); 1010 break; 1011 1012 case 4: 1013 if (elantech_get_resolution_v4(psmouse, &x_res, &y_res)) { 1014 /* 1015 * if query failed, print a warning and leave the values 1016 * zero to resemble synaptics.c behavior. 1017 */ 1018 psmouse_warn(psmouse, "couldn't query resolution data.\n"); 1019 } 1020 1021 __set_bit(BTN_TOOL_QUADTAP, dev->keybit); 1022 /* For X to recognize me as touchpad. */ 1023 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0); 1024 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0); 1025 input_abs_set_res(dev, ABS_X, x_res); 1026 input_abs_set_res(dev, ABS_Y, y_res); 1027 /* 1028 * range of pressure and width is the same as v2, 1029 * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility. 1030 */ 1031 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2, 1032 ETP_PMAX_V2, 0, 0); 1033 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2, 1034 ETP_WMAX_V2, 0, 0); 1035 /* Multitouch capable pad, up to 5 fingers. */ 1036 input_mt_init_slots(dev, ETP_MAX_FINGERS); 1037 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0); 1038 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0); 1039 input_abs_set_res(dev, ABS_MT_POSITION_X, x_res); 1040 input_abs_set_res(dev, ABS_MT_POSITION_Y, y_res); 1041 input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2, 1042 ETP_PMAX_V2, 0, 0); 1043 /* 1044 * The firmware reports how many trace lines the finger spans, 1045 * convert to surface unit as Protocol-B requires. 1046 */ 1047 input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0, 1048 ETP_WMAX_V2 * width, 0, 0); 1049 break; 1050 } 1051 1052 etd->y_max = y_max; 1053 etd->width = width; 1054 1055 return 0; 1056 } 1057 1058 struct elantech_attr_data { 1059 size_t field_offset; 1060 unsigned char reg; 1061 }; 1062 1063 /* 1064 * Display a register value by reading a sysfs entry 1065 */ 1066 static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data, 1067 char *buf) 1068 { 1069 struct elantech_data *etd = psmouse->private; 1070 struct elantech_attr_data *attr = data; 1071 unsigned char *reg = (unsigned char *) etd + attr->field_offset; 1072 int rc = 0; 1073 1074 if (attr->reg) 1075 rc = elantech_read_reg(psmouse, attr->reg, reg); 1076 1077 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg); 1078 } 1079 1080 /* 1081 * Write a register value by writing a sysfs entry 1082 */ 1083 static ssize_t elantech_set_int_attr(struct psmouse *psmouse, 1084 void *data, const char *buf, size_t count) 1085 { 1086 struct elantech_data *etd = psmouse->private; 1087 struct elantech_attr_data *attr = data; 1088 unsigned char *reg = (unsigned char *) etd + attr->field_offset; 1089 unsigned char value; 1090 int err; 1091 1092 err = kstrtou8(buf, 16, &value); 1093 if (err) 1094 return err; 1095 1096 /* Do we need to preserve some bits for version 2 hardware too? */ 1097 if (etd->hw_version == 1) { 1098 if (attr->reg == 0x10) 1099 /* Force absolute mode always on */ 1100 value |= ETP_R10_ABSOLUTE_MODE; 1101 else if (attr->reg == 0x11) 1102 /* Force 4 byte mode always on */ 1103 value |= ETP_R11_4_BYTE_MODE; 1104 } 1105 1106 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0) 1107 *reg = value; 1108 1109 return count; 1110 } 1111 1112 #define ELANTECH_INT_ATTR(_name, _register) \ 1113 static struct elantech_attr_data elantech_attr_##_name = { \ 1114 .field_offset = offsetof(struct elantech_data, _name), \ 1115 .reg = _register, \ 1116 }; \ 1117 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \ 1118 &elantech_attr_##_name, \ 1119 elantech_show_int_attr, \ 1120 elantech_set_int_attr) 1121 1122 ELANTECH_INT_ATTR(reg_07, 0x07); 1123 ELANTECH_INT_ATTR(reg_10, 0x10); 1124 ELANTECH_INT_ATTR(reg_11, 0x11); 1125 ELANTECH_INT_ATTR(reg_20, 0x20); 1126 ELANTECH_INT_ATTR(reg_21, 0x21); 1127 ELANTECH_INT_ATTR(reg_22, 0x22); 1128 ELANTECH_INT_ATTR(reg_23, 0x23); 1129 ELANTECH_INT_ATTR(reg_24, 0x24); 1130 ELANTECH_INT_ATTR(reg_25, 0x25); 1131 ELANTECH_INT_ATTR(reg_26, 0x26); 1132 ELANTECH_INT_ATTR(debug, 0); 1133 ELANTECH_INT_ATTR(paritycheck, 0); 1134 1135 static struct attribute *elantech_attrs[] = { 1136 &psmouse_attr_reg_07.dattr.attr, 1137 &psmouse_attr_reg_10.dattr.attr, 1138 &psmouse_attr_reg_11.dattr.attr, 1139 &psmouse_attr_reg_20.dattr.attr, 1140 &psmouse_attr_reg_21.dattr.attr, 1141 &psmouse_attr_reg_22.dattr.attr, 1142 &psmouse_attr_reg_23.dattr.attr, 1143 &psmouse_attr_reg_24.dattr.attr, 1144 &psmouse_attr_reg_25.dattr.attr, 1145 &psmouse_attr_reg_26.dattr.attr, 1146 &psmouse_attr_debug.dattr.attr, 1147 &psmouse_attr_paritycheck.dattr.attr, 1148 NULL 1149 }; 1150 1151 static struct attribute_group elantech_attr_group = { 1152 .attrs = elantech_attrs, 1153 }; 1154 1155 static bool elantech_is_signature_valid(const unsigned char *param) 1156 { 1157 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 }; 1158 int i; 1159 1160 if (param[0] == 0) 1161 return false; 1162 1163 if (param[1] == 0) 1164 return true; 1165 1166 for (i = 0; i < ARRAY_SIZE(rates); i++) 1167 if (param[2] == rates[i]) 1168 return false; 1169 1170 return true; 1171 } 1172 1173 /* 1174 * Use magic knock to detect Elantech touchpad 1175 */ 1176 int elantech_detect(struct psmouse *psmouse, bool set_properties) 1177 { 1178 struct ps2dev *ps2dev = &psmouse->ps2dev; 1179 unsigned char param[3]; 1180 1181 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS); 1182 1183 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) || 1184 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || 1185 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || 1186 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || 1187 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) { 1188 psmouse_dbg(psmouse, "sending Elantech magic knock failed.\n"); 1189 return -1; 1190 } 1191 1192 /* 1193 * Report this in case there are Elantech models that use a different 1194 * set of magic numbers 1195 */ 1196 if (param[0] != 0x3c || param[1] != 0x03 || 1197 (param[2] != 0xc8 && param[2] != 0x00)) { 1198 psmouse_dbg(psmouse, 1199 "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n", 1200 param[0], param[1], param[2]); 1201 return -1; 1202 } 1203 1204 /* 1205 * Query touchpad's firmware version and see if it reports known 1206 * value to avoid mis-detection. Logitech mice are known to respond 1207 * to Elantech magic knock and there might be more. 1208 */ 1209 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) { 1210 psmouse_dbg(psmouse, "failed to query firmware version.\n"); 1211 return -1; 1212 } 1213 1214 psmouse_dbg(psmouse, 1215 "Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n", 1216 param[0], param[1], param[2]); 1217 1218 if (!elantech_is_signature_valid(param)) { 1219 psmouse_dbg(psmouse, 1220 "Probably not a real Elantech touchpad. Aborting.\n"); 1221 return -1; 1222 } 1223 1224 if (set_properties) { 1225 psmouse->vendor = "Elantech"; 1226 psmouse->name = "Touchpad"; 1227 } 1228 1229 return 0; 1230 } 1231 1232 /* 1233 * Clean up sysfs entries when disconnecting 1234 */ 1235 static void elantech_disconnect(struct psmouse *psmouse) 1236 { 1237 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, 1238 &elantech_attr_group); 1239 kfree(psmouse->private); 1240 psmouse->private = NULL; 1241 } 1242 1243 /* 1244 * Put the touchpad back into absolute mode when reconnecting 1245 */ 1246 static int elantech_reconnect(struct psmouse *psmouse) 1247 { 1248 if (elantech_detect(psmouse, 0)) 1249 return -1; 1250 1251 if (elantech_set_absolute_mode(psmouse)) { 1252 psmouse_err(psmouse, 1253 "failed to put touchpad back into absolute mode.\n"); 1254 return -1; 1255 } 1256 1257 return 0; 1258 } 1259 1260 /* 1261 * determine hardware version and set some properties according to it. 1262 */ 1263 static int elantech_set_properties(struct elantech_data *etd) 1264 { 1265 /* This represents the version of IC body. */ 1266 int ver = (etd->fw_version & 0x0f0000) >> 16; 1267 1268 /* Early version of Elan touchpads doesn't obey the rule. */ 1269 if (etd->fw_version < 0x020030 || etd->fw_version == 0x020600) 1270 etd->hw_version = 1; 1271 else { 1272 switch (ver) { 1273 case 2: 1274 case 4: 1275 etd->hw_version = 2; 1276 break; 1277 case 5: 1278 etd->hw_version = 3; 1279 break; 1280 case 6: 1281 etd->hw_version = 4; 1282 break; 1283 default: 1284 return -1; 1285 } 1286 } 1287 1288 /* decide which send_cmd we're gonna use early */ 1289 etd->send_cmd = etd->hw_version >= 3 ? elantech_send_cmd : 1290 synaptics_send_cmd; 1291 1292 /* Turn on packet checking by default */ 1293 etd->paritycheck = 1; 1294 1295 /* 1296 * This firmware suffers from misreporting coordinates when 1297 * a touch action starts causing the mouse cursor or scrolled page 1298 * to jump. Enable a workaround. 1299 */ 1300 etd->jumpy_cursor = 1301 (etd->fw_version == 0x020022 || etd->fw_version == 0x020600); 1302 1303 if (etd->hw_version > 1) { 1304 /* For now show extra debug information */ 1305 etd->debug = 1; 1306 1307 if (etd->fw_version >= 0x020800) 1308 etd->reports_pressure = true; 1309 } 1310 1311 return 0; 1312 } 1313 1314 /* 1315 * Initialize the touchpad and create sysfs entries 1316 */ 1317 int elantech_init(struct psmouse *psmouse) 1318 { 1319 struct elantech_data *etd; 1320 int i, error; 1321 unsigned char param[3]; 1322 1323 psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL); 1324 if (!etd) 1325 return -ENOMEM; 1326 1327 etd->parity[0] = 1; 1328 for (i = 1; i < 256; i++) 1329 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1; 1330 1331 /* 1332 * Do the version query again so we can store the result 1333 */ 1334 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) { 1335 psmouse_err(psmouse, "failed to query firmware version.\n"); 1336 goto init_fail; 1337 } 1338 etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2]; 1339 1340 if (elantech_set_properties(etd)) { 1341 psmouse_err(psmouse, "unknown hardware version, aborting...\n"); 1342 goto init_fail; 1343 } 1344 psmouse_info(psmouse, 1345 "assuming hardware version %d (with firmware version 0x%02x%02x%02x)\n", 1346 etd->hw_version, param[0], param[1], param[2]); 1347 1348 if (etd->send_cmd(psmouse, ETP_CAPABILITIES_QUERY, 1349 etd->capabilities)) { 1350 psmouse_err(psmouse, "failed to query capabilities.\n"); 1351 goto init_fail; 1352 } 1353 psmouse_info(psmouse, 1354 "Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n", 1355 etd->capabilities[0], etd->capabilities[1], 1356 etd->capabilities[2]); 1357 1358 if (elantech_set_absolute_mode(psmouse)) { 1359 psmouse_err(psmouse, 1360 "failed to put touchpad into absolute mode.\n"); 1361 goto init_fail; 1362 } 1363 1364 if (elantech_set_input_params(psmouse)) { 1365 psmouse_err(psmouse, "failed to query touchpad range.\n"); 1366 goto init_fail; 1367 } 1368 1369 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj, 1370 &elantech_attr_group); 1371 if (error) { 1372 psmouse_err(psmouse, 1373 "failed to create sysfs attributes, error: %d.\n", 1374 error); 1375 goto init_fail; 1376 } 1377 1378 psmouse->protocol_handler = elantech_process_byte; 1379 psmouse->disconnect = elantech_disconnect; 1380 psmouse->reconnect = elantech_reconnect; 1381 psmouse->pktsize = etd->hw_version > 1 ? 6 : 4; 1382 1383 return 0; 1384 1385 init_fail: 1386 kfree(etd); 1387 return -1; 1388 } 1389