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_mt_report_pointer_emulation(dev, true); 490 input_sync(dev); 491 } 492 493 static void process_packet_status_v4(struct psmouse *psmouse) 494 { 495 struct input_dev *dev = psmouse->dev; 496 unsigned char *packet = psmouse->packet; 497 unsigned fingers; 498 int i; 499 500 /* notify finger state change */ 501 fingers = packet[1] & 0x1f; 502 for (i = 0; i < ETP_MAX_FINGERS; i++) { 503 if ((fingers & (1 << i)) == 0) { 504 input_mt_slot(dev, i); 505 input_mt_report_slot_state(dev, MT_TOOL_FINGER, false); 506 } 507 } 508 509 elantech_input_sync_v4(psmouse); 510 } 511 512 static void process_packet_head_v4(struct psmouse *psmouse) 513 { 514 struct input_dev *dev = psmouse->dev; 515 struct elantech_data *etd = psmouse->private; 516 unsigned char *packet = psmouse->packet; 517 int id = ((packet[3] & 0xe0) >> 5) - 1; 518 int pres, traces; 519 520 if (id < 0) 521 return; 522 523 etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2]; 524 etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]); 525 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4); 526 traces = (packet[0] & 0xf0) >> 4; 527 528 input_mt_slot(dev, id); 529 input_mt_report_slot_state(dev, MT_TOOL_FINGER, true); 530 531 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x); 532 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y); 533 input_report_abs(dev, ABS_MT_PRESSURE, pres); 534 input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->width); 535 /* report this for backwards compatibility */ 536 input_report_abs(dev, ABS_TOOL_WIDTH, traces); 537 538 elantech_input_sync_v4(psmouse); 539 } 540 541 static void process_packet_motion_v4(struct psmouse *psmouse) 542 { 543 struct input_dev *dev = psmouse->dev; 544 struct elantech_data *etd = psmouse->private; 545 unsigned char *packet = psmouse->packet; 546 int weight, delta_x1 = 0, delta_y1 = 0, delta_x2 = 0, delta_y2 = 0; 547 int id, sid; 548 549 id = ((packet[0] & 0xe0) >> 5) - 1; 550 if (id < 0) 551 return; 552 553 sid = ((packet[3] & 0xe0) >> 5) - 1; 554 weight = (packet[0] & 0x10) ? ETP_WEIGHT_VALUE : 1; 555 /* 556 * Motion packets give us the delta of x, y values of specific fingers, 557 * but in two's complement. Let the compiler do the conversion for us. 558 * Also _enlarge_ the numbers to int, in case of overflow. 559 */ 560 delta_x1 = (signed char)packet[1]; 561 delta_y1 = (signed char)packet[2]; 562 delta_x2 = (signed char)packet[4]; 563 delta_y2 = (signed char)packet[5]; 564 565 etd->mt[id].x += delta_x1 * weight; 566 etd->mt[id].y -= delta_y1 * weight; 567 input_mt_slot(dev, id); 568 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x); 569 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y); 570 571 if (sid >= 0) { 572 etd->mt[sid].x += delta_x2 * weight; 573 etd->mt[sid].y -= delta_y2 * weight; 574 input_mt_slot(dev, sid); 575 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[sid].x); 576 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[sid].y); 577 } 578 579 elantech_input_sync_v4(psmouse); 580 } 581 582 static void elantech_report_absolute_v4(struct psmouse *psmouse, 583 int packet_type) 584 { 585 switch (packet_type) { 586 case PACKET_V4_STATUS: 587 process_packet_status_v4(psmouse); 588 break; 589 590 case PACKET_V4_HEAD: 591 process_packet_head_v4(psmouse); 592 break; 593 594 case PACKET_V4_MOTION: 595 process_packet_motion_v4(psmouse); 596 break; 597 598 case PACKET_UNKNOWN: 599 default: 600 /* impossible to get here */ 601 break; 602 } 603 } 604 605 static int elantech_packet_check_v1(struct psmouse *psmouse) 606 { 607 struct elantech_data *etd = psmouse->private; 608 unsigned char *packet = psmouse->packet; 609 unsigned char p1, p2, p3; 610 611 /* Parity bits are placed differently */ 612 if (etd->fw_version < 0x020000) { 613 /* byte 0: D U p1 p2 1 p3 R L */ 614 p1 = (packet[0] & 0x20) >> 5; 615 p2 = (packet[0] & 0x10) >> 4; 616 } else { 617 /* byte 0: n1 n0 p2 p1 1 p3 R L */ 618 p1 = (packet[0] & 0x10) >> 4; 619 p2 = (packet[0] & 0x20) >> 5; 620 } 621 622 p3 = (packet[0] & 0x04) >> 2; 623 624 return etd->parity[packet[1]] == p1 && 625 etd->parity[packet[2]] == p2 && 626 etd->parity[packet[3]] == p3; 627 } 628 629 static int elantech_debounce_check_v2(struct psmouse *psmouse) 630 { 631 /* 632 * When we encounter packet that matches this exactly, it means the 633 * hardware is in debounce status. Just ignore the whole packet. 634 */ 635 const u8 debounce_packet[] = { 0x84, 0xff, 0xff, 0x02, 0xff, 0xff }; 636 unsigned char *packet = psmouse->packet; 637 638 return !memcmp(packet, debounce_packet, sizeof(debounce_packet)); 639 } 640 641 static int elantech_packet_check_v2(struct psmouse *psmouse) 642 { 643 struct elantech_data *etd = psmouse->private; 644 unsigned char *packet = psmouse->packet; 645 646 /* 647 * V2 hardware has two flavors. Older ones that do not report pressure, 648 * and newer ones that reports pressure and width. With newer ones, all 649 * packets (1, 2, 3 finger touch) have the same constant bits. With 650 * older ones, 1/3 finger touch packets and 2 finger touch packets 651 * have different constant bits. 652 * With all three cases, if the constant bits are not exactly what I 653 * expected, I consider them invalid. 654 */ 655 if (etd->reports_pressure) 656 return (packet[0] & 0x0c) == 0x04 && 657 (packet[3] & 0x0f) == 0x02; 658 659 if ((packet[0] & 0xc0) == 0x80) 660 return (packet[0] & 0x0c) == 0x0c && 661 (packet[3] & 0x0e) == 0x08; 662 663 return (packet[0] & 0x3c) == 0x3c && 664 (packet[1] & 0xf0) == 0x00 && 665 (packet[3] & 0x3e) == 0x38 && 666 (packet[4] & 0xf0) == 0x00; 667 } 668 669 /* 670 * We check the constant bits to determine what packet type we get, 671 * so packet checking is mandatory for v3 and later hardware. 672 */ 673 static int elantech_packet_check_v3(struct psmouse *psmouse) 674 { 675 const u8 debounce_packet[] = { 0xc4, 0xff, 0xff, 0x02, 0xff, 0xff }; 676 unsigned char *packet = psmouse->packet; 677 678 /* 679 * check debounce first, it has the same signature in byte 0 680 * and byte 3 as PACKET_V3_HEAD. 681 */ 682 if (!memcmp(packet, debounce_packet, sizeof(debounce_packet))) 683 return PACKET_DEBOUNCE; 684 685 if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0xcf) == 0x02) 686 return PACKET_V3_HEAD; 687 688 if ((packet[0] & 0x0c) == 0x0c && (packet[3] & 0xce) == 0x0c) 689 return PACKET_V3_TAIL; 690 691 return PACKET_UNKNOWN; 692 } 693 694 static int elantech_packet_check_v4(struct psmouse *psmouse) 695 { 696 unsigned char *packet = psmouse->packet; 697 698 if ((packet[0] & 0x0c) == 0x04 && 699 (packet[3] & 0x1f) == 0x11) 700 return PACKET_V4_HEAD; 701 702 if ((packet[0] & 0x0c) == 0x04 && 703 (packet[3] & 0x1f) == 0x12) 704 return PACKET_V4_MOTION; 705 706 if ((packet[0] & 0x0c) == 0x04 && 707 (packet[3] & 0x1f) == 0x10) 708 return PACKET_V4_STATUS; 709 710 return PACKET_UNKNOWN; 711 } 712 713 /* 714 * Process byte stream from mouse and handle complete packets 715 */ 716 static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse) 717 { 718 struct elantech_data *etd = psmouse->private; 719 int packet_type; 720 721 if (psmouse->pktcnt < psmouse->pktsize) 722 return PSMOUSE_GOOD_DATA; 723 724 if (etd->debug > 1) 725 elantech_packet_dump(psmouse); 726 727 switch (etd->hw_version) { 728 case 1: 729 if (etd->paritycheck && !elantech_packet_check_v1(psmouse)) 730 return PSMOUSE_BAD_DATA; 731 732 elantech_report_absolute_v1(psmouse); 733 break; 734 735 case 2: 736 /* ignore debounce */ 737 if (elantech_debounce_check_v2(psmouse)) 738 return PSMOUSE_FULL_PACKET; 739 740 if (etd->paritycheck && !elantech_packet_check_v2(psmouse)) 741 return PSMOUSE_BAD_DATA; 742 743 elantech_report_absolute_v2(psmouse); 744 break; 745 746 case 3: 747 packet_type = elantech_packet_check_v3(psmouse); 748 /* ignore debounce */ 749 if (packet_type == PACKET_DEBOUNCE) 750 return PSMOUSE_FULL_PACKET; 751 752 if (packet_type == PACKET_UNKNOWN) 753 return PSMOUSE_BAD_DATA; 754 755 elantech_report_absolute_v3(psmouse, packet_type); 756 break; 757 758 case 4: 759 packet_type = elantech_packet_check_v4(psmouse); 760 if (packet_type == PACKET_UNKNOWN) 761 return PSMOUSE_BAD_DATA; 762 763 elantech_report_absolute_v4(psmouse, packet_type); 764 break; 765 } 766 767 return PSMOUSE_FULL_PACKET; 768 } 769 770 /* 771 * Put the touchpad into absolute mode 772 */ 773 static int elantech_set_absolute_mode(struct psmouse *psmouse) 774 { 775 struct elantech_data *etd = psmouse->private; 776 unsigned char val; 777 int tries = ETP_READ_BACK_TRIES; 778 int rc = 0; 779 780 switch (etd->hw_version) { 781 case 1: 782 etd->reg_10 = 0x16; 783 etd->reg_11 = 0x8f; 784 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) || 785 elantech_write_reg(psmouse, 0x11, etd->reg_11)) { 786 rc = -1; 787 } 788 break; 789 790 case 2: 791 /* Windows driver values */ 792 etd->reg_10 = 0x54; 793 etd->reg_11 = 0x88; /* 0x8a */ 794 etd->reg_21 = 0x60; /* 0x00 */ 795 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) || 796 elantech_write_reg(psmouse, 0x11, etd->reg_11) || 797 elantech_write_reg(psmouse, 0x21, etd->reg_21)) { 798 rc = -1; 799 } 800 break; 801 802 case 3: 803 etd->reg_10 = 0x0b; 804 if (elantech_write_reg(psmouse, 0x10, etd->reg_10)) 805 rc = -1; 806 807 break; 808 809 case 4: 810 etd->reg_07 = 0x01; 811 if (elantech_write_reg(psmouse, 0x07, etd->reg_07)) 812 rc = -1; 813 814 goto skip_readback_reg_10; /* v4 has no reg 0x10 to read */ 815 } 816 817 if (rc == 0) { 818 /* 819 * Read back reg 0x10. For hardware version 1 we must make 820 * sure the absolute mode bit is set. For hardware version 2 821 * the touchpad is probably initializing and not ready until 822 * we read back the value we just wrote. 823 */ 824 do { 825 rc = elantech_read_reg(psmouse, 0x10, &val); 826 if (rc == 0) 827 break; 828 tries--; 829 elantech_debug("retrying read (%d).\n", tries); 830 msleep(ETP_READ_BACK_DELAY); 831 } while (tries > 0); 832 833 if (rc) { 834 psmouse_err(psmouse, 835 "failed to read back register 0x10.\n"); 836 } else if (etd->hw_version == 1 && 837 !(val & ETP_R10_ABSOLUTE_MODE)) { 838 psmouse_err(psmouse, 839 "touchpad refuses to switch to absolute mode.\n"); 840 rc = -1; 841 } 842 } 843 844 skip_readback_reg_10: 845 if (rc) 846 psmouse_err(psmouse, "failed to initialise registers.\n"); 847 848 return rc; 849 } 850 851 static int elantech_set_range(struct psmouse *psmouse, 852 unsigned int *x_min, unsigned int *y_min, 853 unsigned int *x_max, unsigned int *y_max, 854 unsigned int *width) 855 { 856 struct elantech_data *etd = psmouse->private; 857 unsigned char param[3]; 858 unsigned char traces; 859 860 switch (etd->hw_version) { 861 case 1: 862 *x_min = ETP_XMIN_V1; 863 *y_min = ETP_YMIN_V1; 864 *x_max = ETP_XMAX_V1; 865 *y_max = ETP_YMAX_V1; 866 break; 867 868 case 2: 869 if (etd->fw_version == 0x020800 || 870 etd->fw_version == 0x020b00 || 871 etd->fw_version == 0x020030) { 872 *x_min = ETP_XMIN_V2; 873 *y_min = ETP_YMIN_V2; 874 *x_max = ETP_XMAX_V2; 875 *y_max = ETP_YMAX_V2; 876 } else { 877 int i; 878 int fixed_dpi; 879 880 i = (etd->fw_version > 0x020800 && 881 etd->fw_version < 0x020900) ? 1 : 2; 882 883 if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param)) 884 return -1; 885 886 fixed_dpi = param[1] & 0x10; 887 888 if (((etd->fw_version >> 16) == 0x14) && fixed_dpi) { 889 if (etd->send_cmd(psmouse, ETP_SAMPLE_QUERY, param)) 890 return -1; 891 892 *x_max = (etd->capabilities[1] - i) * param[1] / 2; 893 *y_max = (etd->capabilities[2] - i) * param[2] / 2; 894 } else if (etd->fw_version == 0x040216) { 895 *x_max = 819; 896 *y_max = 405; 897 } else if (etd->fw_version == 0x040219 || etd->fw_version == 0x040215) { 898 *x_max = 900; 899 *y_max = 500; 900 } else { 901 *x_max = (etd->capabilities[1] - i) * 64; 902 *y_max = (etd->capabilities[2] - i) * 64; 903 } 904 } 905 break; 906 907 case 3: 908 if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param)) 909 return -1; 910 911 *x_max = (0x0f & param[0]) << 8 | param[1]; 912 *y_max = (0xf0 & param[0]) << 4 | param[2]; 913 break; 914 915 case 4: 916 if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param)) 917 return -1; 918 919 *x_max = (0x0f & param[0]) << 8 | param[1]; 920 *y_max = (0xf0 & param[0]) << 4 | param[2]; 921 traces = etd->capabilities[1]; 922 if ((traces < 2) || (traces > *x_max)) 923 return -1; 924 925 *width = *x_max / (traces - 1); 926 break; 927 } 928 929 return 0; 930 } 931 932 /* 933 * (value from firmware) * 10 + 790 = dpi 934 * we also have to convert dpi to dots/mm (*10/254 to avoid floating point) 935 */ 936 static unsigned int elantech_convert_res(unsigned int val) 937 { 938 return (val * 10 + 790) * 10 / 254; 939 } 940 941 static int elantech_get_resolution_v4(struct psmouse *psmouse, 942 unsigned int *x_res, 943 unsigned int *y_res) 944 { 945 unsigned char param[3]; 946 947 if (elantech_send_cmd(psmouse, ETP_RESOLUTION_QUERY, param)) 948 return -1; 949 950 *x_res = elantech_convert_res(param[1] & 0x0f); 951 *y_res = elantech_convert_res((param[1] & 0xf0) >> 4); 952 953 return 0; 954 } 955 956 /* 957 * Set the appropriate event bits for the input subsystem 958 */ 959 static int elantech_set_input_params(struct psmouse *psmouse) 960 { 961 struct input_dev *dev = psmouse->dev; 962 struct elantech_data *etd = psmouse->private; 963 unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0; 964 unsigned int x_res = 0, y_res = 0; 965 966 if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width)) 967 return -1; 968 969 __set_bit(INPUT_PROP_POINTER, dev->propbit); 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, 0); 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 /* v4 is clickpad, with only one button. */ 1021 __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit); 1022 __clear_bit(BTN_RIGHT, dev->keybit); 1023 __set_bit(BTN_TOOL_QUADTAP, dev->keybit); 1024 /* For X to recognize me as touchpad. */ 1025 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0); 1026 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0); 1027 input_abs_set_res(dev, ABS_X, x_res); 1028 input_abs_set_res(dev, ABS_Y, y_res); 1029 /* 1030 * range of pressure and width is the same as v2, 1031 * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility. 1032 */ 1033 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2, 1034 ETP_PMAX_V2, 0, 0); 1035 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2, 1036 ETP_WMAX_V2, 0, 0); 1037 /* Multitouch capable pad, up to 5 fingers. */ 1038 input_mt_init_slots(dev, ETP_MAX_FINGERS, 0); 1039 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0); 1040 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0); 1041 input_abs_set_res(dev, ABS_MT_POSITION_X, x_res); 1042 input_abs_set_res(dev, ABS_MT_POSITION_Y, y_res); 1043 input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2, 1044 ETP_PMAX_V2, 0, 0); 1045 /* 1046 * The firmware reports how many trace lines the finger spans, 1047 * convert to surface unit as Protocol-B requires. 1048 */ 1049 input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0, 1050 ETP_WMAX_V2 * width, 0, 0); 1051 break; 1052 } 1053 1054 etd->y_max = y_max; 1055 etd->width = width; 1056 1057 return 0; 1058 } 1059 1060 struct elantech_attr_data { 1061 size_t field_offset; 1062 unsigned char reg; 1063 }; 1064 1065 /* 1066 * Display a register value by reading a sysfs entry 1067 */ 1068 static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data, 1069 char *buf) 1070 { 1071 struct elantech_data *etd = psmouse->private; 1072 struct elantech_attr_data *attr = data; 1073 unsigned char *reg = (unsigned char *) etd + attr->field_offset; 1074 int rc = 0; 1075 1076 if (attr->reg) 1077 rc = elantech_read_reg(psmouse, attr->reg, reg); 1078 1079 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg); 1080 } 1081 1082 /* 1083 * Write a register value by writing a sysfs entry 1084 */ 1085 static ssize_t elantech_set_int_attr(struct psmouse *psmouse, 1086 void *data, const char *buf, size_t count) 1087 { 1088 struct elantech_data *etd = psmouse->private; 1089 struct elantech_attr_data *attr = data; 1090 unsigned char *reg = (unsigned char *) etd + attr->field_offset; 1091 unsigned char value; 1092 int err; 1093 1094 err = kstrtou8(buf, 16, &value); 1095 if (err) 1096 return err; 1097 1098 /* Do we need to preserve some bits for version 2 hardware too? */ 1099 if (etd->hw_version == 1) { 1100 if (attr->reg == 0x10) 1101 /* Force absolute mode always on */ 1102 value |= ETP_R10_ABSOLUTE_MODE; 1103 else if (attr->reg == 0x11) 1104 /* Force 4 byte mode always on */ 1105 value |= ETP_R11_4_BYTE_MODE; 1106 } 1107 1108 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0) 1109 *reg = value; 1110 1111 return count; 1112 } 1113 1114 #define ELANTECH_INT_ATTR(_name, _register) \ 1115 static struct elantech_attr_data elantech_attr_##_name = { \ 1116 .field_offset = offsetof(struct elantech_data, _name), \ 1117 .reg = _register, \ 1118 }; \ 1119 PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO, \ 1120 &elantech_attr_##_name, \ 1121 elantech_show_int_attr, \ 1122 elantech_set_int_attr) 1123 1124 ELANTECH_INT_ATTR(reg_07, 0x07); 1125 ELANTECH_INT_ATTR(reg_10, 0x10); 1126 ELANTECH_INT_ATTR(reg_11, 0x11); 1127 ELANTECH_INT_ATTR(reg_20, 0x20); 1128 ELANTECH_INT_ATTR(reg_21, 0x21); 1129 ELANTECH_INT_ATTR(reg_22, 0x22); 1130 ELANTECH_INT_ATTR(reg_23, 0x23); 1131 ELANTECH_INT_ATTR(reg_24, 0x24); 1132 ELANTECH_INT_ATTR(reg_25, 0x25); 1133 ELANTECH_INT_ATTR(reg_26, 0x26); 1134 ELANTECH_INT_ATTR(debug, 0); 1135 ELANTECH_INT_ATTR(paritycheck, 0); 1136 1137 static struct attribute *elantech_attrs[] = { 1138 &psmouse_attr_reg_07.dattr.attr, 1139 &psmouse_attr_reg_10.dattr.attr, 1140 &psmouse_attr_reg_11.dattr.attr, 1141 &psmouse_attr_reg_20.dattr.attr, 1142 &psmouse_attr_reg_21.dattr.attr, 1143 &psmouse_attr_reg_22.dattr.attr, 1144 &psmouse_attr_reg_23.dattr.attr, 1145 &psmouse_attr_reg_24.dattr.attr, 1146 &psmouse_attr_reg_25.dattr.attr, 1147 &psmouse_attr_reg_26.dattr.attr, 1148 &psmouse_attr_debug.dattr.attr, 1149 &psmouse_attr_paritycheck.dattr.attr, 1150 NULL 1151 }; 1152 1153 static struct attribute_group elantech_attr_group = { 1154 .attrs = elantech_attrs, 1155 }; 1156 1157 static bool elantech_is_signature_valid(const unsigned char *param) 1158 { 1159 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 }; 1160 int i; 1161 1162 if (param[0] == 0) 1163 return false; 1164 1165 if (param[1] == 0) 1166 return true; 1167 1168 for (i = 0; i < ARRAY_SIZE(rates); i++) 1169 if (param[2] == rates[i]) 1170 return false; 1171 1172 return true; 1173 } 1174 1175 /* 1176 * Use magic knock to detect Elantech touchpad 1177 */ 1178 int elantech_detect(struct psmouse *psmouse, bool set_properties) 1179 { 1180 struct ps2dev *ps2dev = &psmouse->ps2dev; 1181 unsigned char param[3]; 1182 1183 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS); 1184 1185 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) || 1186 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || 1187 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || 1188 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || 1189 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) { 1190 psmouse_dbg(psmouse, "sending Elantech magic knock failed.\n"); 1191 return -1; 1192 } 1193 1194 /* 1195 * Report this in case there are Elantech models that use a different 1196 * set of magic numbers 1197 */ 1198 if (param[0] != 0x3c || param[1] != 0x03 || 1199 (param[2] != 0xc8 && param[2] != 0x00)) { 1200 psmouse_dbg(psmouse, 1201 "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n", 1202 param[0], param[1], param[2]); 1203 return -1; 1204 } 1205 1206 /* 1207 * Query touchpad's firmware version and see if it reports known 1208 * value to avoid mis-detection. Logitech mice are known to respond 1209 * to Elantech magic knock and there might be more. 1210 */ 1211 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) { 1212 psmouse_dbg(psmouse, "failed to query firmware version.\n"); 1213 return -1; 1214 } 1215 1216 psmouse_dbg(psmouse, 1217 "Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n", 1218 param[0], param[1], param[2]); 1219 1220 if (!elantech_is_signature_valid(param)) { 1221 psmouse_dbg(psmouse, 1222 "Probably not a real Elantech touchpad. Aborting.\n"); 1223 return -1; 1224 } 1225 1226 if (set_properties) { 1227 psmouse->vendor = "Elantech"; 1228 psmouse->name = "Touchpad"; 1229 } 1230 1231 return 0; 1232 } 1233 1234 /* 1235 * Clean up sysfs entries when disconnecting 1236 */ 1237 static void elantech_disconnect(struct psmouse *psmouse) 1238 { 1239 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, 1240 &elantech_attr_group); 1241 kfree(psmouse->private); 1242 psmouse->private = NULL; 1243 } 1244 1245 /* 1246 * Put the touchpad back into absolute mode when reconnecting 1247 */ 1248 static int elantech_reconnect(struct psmouse *psmouse) 1249 { 1250 psmouse_reset(psmouse); 1251 1252 if (elantech_detect(psmouse, 0)) 1253 return -1; 1254 1255 if (elantech_set_absolute_mode(psmouse)) { 1256 psmouse_err(psmouse, 1257 "failed to put touchpad back into absolute mode.\n"); 1258 return -1; 1259 } 1260 1261 return 0; 1262 } 1263 1264 /* 1265 * determine hardware version and set some properties according to it. 1266 */ 1267 static int elantech_set_properties(struct elantech_data *etd) 1268 { 1269 /* This represents the version of IC body. */ 1270 int ver = (etd->fw_version & 0x0f0000) >> 16; 1271 1272 /* Early version of Elan touchpads doesn't obey the rule. */ 1273 if (etd->fw_version < 0x020030 || etd->fw_version == 0x020600) 1274 etd->hw_version = 1; 1275 else { 1276 switch (ver) { 1277 case 2: 1278 case 4: 1279 etd->hw_version = 2; 1280 break; 1281 case 5: 1282 etd->hw_version = 3; 1283 break; 1284 case 6: 1285 etd->hw_version = 4; 1286 break; 1287 default: 1288 return -1; 1289 } 1290 } 1291 1292 /* decide which send_cmd we're gonna use early */ 1293 etd->send_cmd = etd->hw_version >= 3 ? elantech_send_cmd : 1294 synaptics_send_cmd; 1295 1296 /* Turn on packet checking by default */ 1297 etd->paritycheck = 1; 1298 1299 /* 1300 * This firmware suffers from misreporting coordinates when 1301 * a touch action starts causing the mouse cursor or scrolled page 1302 * to jump. Enable a workaround. 1303 */ 1304 etd->jumpy_cursor = 1305 (etd->fw_version == 0x020022 || etd->fw_version == 0x020600); 1306 1307 if (etd->hw_version > 1) { 1308 /* For now show extra debug information */ 1309 etd->debug = 1; 1310 1311 if (etd->fw_version >= 0x020800) 1312 etd->reports_pressure = true; 1313 } 1314 1315 return 0; 1316 } 1317 1318 /* 1319 * Initialize the touchpad and create sysfs entries 1320 */ 1321 int elantech_init(struct psmouse *psmouse) 1322 { 1323 struct elantech_data *etd; 1324 int i, error; 1325 unsigned char param[3]; 1326 1327 psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL); 1328 if (!etd) 1329 return -ENOMEM; 1330 1331 psmouse_reset(psmouse); 1332 1333 etd->parity[0] = 1; 1334 for (i = 1; i < 256; i++) 1335 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1; 1336 1337 /* 1338 * Do the version query again so we can store the result 1339 */ 1340 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) { 1341 psmouse_err(psmouse, "failed to query firmware version.\n"); 1342 goto init_fail; 1343 } 1344 etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2]; 1345 1346 if (elantech_set_properties(etd)) { 1347 psmouse_err(psmouse, "unknown hardware version, aborting...\n"); 1348 goto init_fail; 1349 } 1350 psmouse_info(psmouse, 1351 "assuming hardware version %d (with firmware version 0x%02x%02x%02x)\n", 1352 etd->hw_version, param[0], param[1], param[2]); 1353 1354 if (etd->send_cmd(psmouse, ETP_CAPABILITIES_QUERY, 1355 etd->capabilities)) { 1356 psmouse_err(psmouse, "failed to query capabilities.\n"); 1357 goto init_fail; 1358 } 1359 psmouse_info(psmouse, 1360 "Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n", 1361 etd->capabilities[0], etd->capabilities[1], 1362 etd->capabilities[2]); 1363 1364 if (elantech_set_absolute_mode(psmouse)) { 1365 psmouse_err(psmouse, 1366 "failed to put touchpad into absolute mode.\n"); 1367 goto init_fail; 1368 } 1369 1370 if (elantech_set_input_params(psmouse)) { 1371 psmouse_err(psmouse, "failed to query touchpad range.\n"); 1372 goto init_fail; 1373 } 1374 1375 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj, 1376 &elantech_attr_group); 1377 if (error) { 1378 psmouse_err(psmouse, 1379 "failed to create sysfs attributes, error: %d.\n", 1380 error); 1381 goto init_fail; 1382 } 1383 1384 psmouse->protocol_handler = elantech_process_byte; 1385 psmouse->disconnect = elantech_disconnect; 1386 psmouse->reconnect = elantech_reconnect; 1387 psmouse->pktsize = etd->hw_version > 1 ? 6 : 4; 1388 1389 return 0; 1390 1391 init_fail: 1392 kfree(etd); 1393 return -1; 1394 } 1395