1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Elantech Touchpad driver (v6) 4 * 5 * Copyright (C) 2007-2009 Arjan Opmeer <arjan@opmeer.net> 6 * 7 * Trademarks are the property of their respective owners. 8 */ 9 10 #include <linux/delay.h> 11 #include <linux/dmi.h> 12 #include <linux/slab.h> 13 #include <linux/module.h> 14 #include <linux/i2c.h> 15 #include <linux/input.h> 16 #include <linux/input/mt.h> 17 #include <linux/platform_device.h> 18 #include <linux/serio.h> 19 #include <linux/libps2.h> 20 #include <asm/unaligned.h> 21 #include "psmouse.h" 22 #include "elantech.h" 23 #include "elan_i2c.h" 24 25 #define elantech_debug(fmt, ...) \ 26 do { \ 27 if (etd->info.debug) \ 28 psmouse_printk(KERN_DEBUG, psmouse, \ 29 fmt, ##__VA_ARGS__); \ 30 } while (0) 31 32 /* 33 * Send a Synaptics style sliced query command 34 */ 35 static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c, 36 unsigned char *param) 37 { 38 if (ps2_sliced_command(&psmouse->ps2dev, c) || 39 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) { 40 psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c); 41 return -1; 42 } 43 44 return 0; 45 } 46 47 /* 48 * V3 and later support this fast command 49 */ 50 static int elantech_send_cmd(struct psmouse *psmouse, unsigned char c, 51 unsigned char *param) 52 { 53 struct ps2dev *ps2dev = &psmouse->ps2dev; 54 55 if (ps2_command(ps2dev, NULL, ETP_PS2_CUSTOM_COMMAND) || 56 ps2_command(ps2dev, NULL, c) || 57 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) { 58 psmouse_err(psmouse, "%s query 0x%02x failed.\n", __func__, c); 59 return -1; 60 } 61 62 return 0; 63 } 64 65 /* 66 * A retrying version of ps2_command 67 */ 68 static int elantech_ps2_command(struct psmouse *psmouse, 69 unsigned char *param, int command) 70 { 71 struct ps2dev *ps2dev = &psmouse->ps2dev; 72 struct elantech_data *etd = psmouse->private; 73 int rc; 74 int tries = ETP_PS2_COMMAND_TRIES; 75 76 do { 77 rc = ps2_command(ps2dev, param, command); 78 if (rc == 0) 79 break; 80 tries--; 81 elantech_debug("retrying ps2 command 0x%02x (%d).\n", 82 command, tries); 83 msleep(ETP_PS2_COMMAND_DELAY); 84 } while (tries > 0); 85 86 if (rc) 87 psmouse_err(psmouse, "ps2 command 0x%02x failed.\n", command); 88 89 return rc; 90 } 91 92 /* 93 * Send an Elantech style special command to read a value from a register 94 */ 95 static int elantech_read_reg(struct psmouse *psmouse, unsigned char reg, 96 unsigned char *val) 97 { 98 struct elantech_data *etd = psmouse->private; 99 unsigned char param[3]; 100 int rc = 0; 101 102 if (reg < 0x07 || reg > 0x26) 103 return -1; 104 105 if (reg > 0x11 && reg < 0x20) 106 return -1; 107 108 switch (etd->info.hw_version) { 109 case 1: 110 if (ps2_sliced_command(&psmouse->ps2dev, ETP_REGISTER_READ) || 111 ps2_sliced_command(&psmouse->ps2dev, reg) || 112 ps2_command(&psmouse->ps2dev, param, PSMOUSE_CMD_GETINFO)) { 113 rc = -1; 114 } 115 break; 116 117 case 2: 118 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 119 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READ) || 120 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 121 elantech_ps2_command(psmouse, NULL, reg) || 122 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) { 123 rc = -1; 124 } 125 break; 126 127 case 3 ... 4: 128 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 129 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) || 130 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 131 elantech_ps2_command(psmouse, NULL, reg) || 132 elantech_ps2_command(psmouse, param, PSMOUSE_CMD_GETINFO)) { 133 rc = -1; 134 } 135 break; 136 } 137 138 if (rc) 139 psmouse_err(psmouse, "failed to read register 0x%02x.\n", reg); 140 else if (etd->info.hw_version != 4) 141 *val = param[0]; 142 else 143 *val = param[1]; 144 145 return rc; 146 } 147 148 /* 149 * Send an Elantech style special command to write a register with a value 150 */ 151 static int elantech_write_reg(struct psmouse *psmouse, unsigned char reg, 152 unsigned char val) 153 { 154 struct elantech_data *etd = psmouse->private; 155 int rc = 0; 156 157 if (reg < 0x07 || reg > 0x26) 158 return -1; 159 160 if (reg > 0x11 && reg < 0x20) 161 return -1; 162 163 switch (etd->info.hw_version) { 164 case 1: 165 if (ps2_sliced_command(&psmouse->ps2dev, ETP_REGISTER_WRITE) || 166 ps2_sliced_command(&psmouse->ps2dev, reg) || 167 ps2_sliced_command(&psmouse->ps2dev, val) || 168 ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_SETSCALE11)) { 169 rc = -1; 170 } 171 break; 172 173 case 2: 174 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 175 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_WRITE) || 176 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 177 elantech_ps2_command(psmouse, NULL, reg) || 178 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 179 elantech_ps2_command(psmouse, NULL, val) || 180 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) { 181 rc = -1; 182 } 183 break; 184 185 case 3: 186 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 187 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) || 188 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 189 elantech_ps2_command(psmouse, NULL, reg) || 190 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 191 elantech_ps2_command(psmouse, NULL, val) || 192 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) { 193 rc = -1; 194 } 195 break; 196 197 case 4: 198 if (elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 199 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) || 200 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 201 elantech_ps2_command(psmouse, NULL, reg) || 202 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 203 elantech_ps2_command(psmouse, NULL, ETP_REGISTER_READWRITE) || 204 elantech_ps2_command(psmouse, NULL, ETP_PS2_CUSTOM_COMMAND) || 205 elantech_ps2_command(psmouse, NULL, val) || 206 elantech_ps2_command(psmouse, NULL, PSMOUSE_CMD_SETSCALE11)) { 207 rc = -1; 208 } 209 break; 210 } 211 212 if (rc) 213 psmouse_err(psmouse, 214 "failed to write register 0x%02x with value 0x%02x.\n", 215 reg, val); 216 217 return rc; 218 } 219 220 /* 221 * Dump a complete mouse movement packet to the syslog 222 */ 223 static void elantech_packet_dump(struct psmouse *psmouse) 224 { 225 psmouse_printk(KERN_DEBUG, psmouse, "PS/2 packet [%*ph]\n", 226 psmouse->pktsize, psmouse->packet); 227 } 228 229 /* 230 * Interpret complete data packets and report absolute mode input events for 231 * hardware version 1. (4 byte packets) 232 */ 233 static void elantech_report_absolute_v1(struct psmouse *psmouse) 234 { 235 struct input_dev *dev = psmouse->dev; 236 struct elantech_data *etd = psmouse->private; 237 unsigned char *packet = psmouse->packet; 238 int fingers; 239 240 if (etd->info.fw_version < 0x020000) { 241 /* 242 * byte 0: D U p1 p2 1 p3 R L 243 * byte 1: f 0 th tw x9 x8 y9 y8 244 */ 245 fingers = ((packet[1] & 0x80) >> 7) + 246 ((packet[1] & 0x30) >> 4); 247 } else { 248 /* 249 * byte 0: n1 n0 p2 p1 1 p3 R L 250 * byte 1: 0 0 0 0 x9 x8 y9 y8 251 */ 252 fingers = (packet[0] & 0xc0) >> 6; 253 } 254 255 if (etd->info.jumpy_cursor) { 256 if (fingers != 1) { 257 etd->single_finger_reports = 0; 258 } else if (etd->single_finger_reports < 2) { 259 /* Discard first 2 reports of one finger, bogus */ 260 etd->single_finger_reports++; 261 elantech_debug("discarding packet\n"); 262 return; 263 } 264 } 265 266 input_report_key(dev, BTN_TOUCH, fingers != 0); 267 268 /* 269 * byte 2: x7 x6 x5 x4 x3 x2 x1 x0 270 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0 271 */ 272 if (fingers) { 273 input_report_abs(dev, ABS_X, 274 ((packet[1] & 0x0c) << 6) | packet[2]); 275 input_report_abs(dev, ABS_Y, 276 etd->y_max - (((packet[1] & 0x03) << 8) | packet[3])); 277 } 278 279 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1); 280 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2); 281 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3); 282 283 psmouse_report_standard_buttons(dev, packet[0]); 284 285 if (etd->info.fw_version < 0x020000 && 286 (etd->info.capabilities[0] & ETP_CAP_HAS_ROCKER)) { 287 /* rocker up */ 288 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40); 289 /* rocker down */ 290 input_report_key(dev, BTN_BACK, packet[0] & 0x80); 291 } 292 293 input_sync(dev); 294 } 295 296 static void elantech_set_slot(struct input_dev *dev, int slot, bool active, 297 unsigned int x, unsigned int y) 298 { 299 input_mt_slot(dev, slot); 300 input_mt_report_slot_state(dev, MT_TOOL_FINGER, active); 301 if (active) { 302 input_report_abs(dev, ABS_MT_POSITION_X, x); 303 input_report_abs(dev, ABS_MT_POSITION_Y, y); 304 } 305 } 306 307 /* x1 < x2 and y1 < y2 when two fingers, x = y = 0 when not pressed */ 308 static void elantech_report_semi_mt_data(struct input_dev *dev, 309 unsigned int num_fingers, 310 unsigned int x1, unsigned int y1, 311 unsigned int x2, unsigned int y2) 312 { 313 elantech_set_slot(dev, 0, num_fingers != 0, x1, y1); 314 elantech_set_slot(dev, 1, num_fingers >= 2, x2, y2); 315 } 316 317 /* 318 * Interpret complete data packets and report absolute mode input events for 319 * hardware version 2. (6 byte packets) 320 */ 321 static void elantech_report_absolute_v2(struct psmouse *psmouse) 322 { 323 struct elantech_data *etd = psmouse->private; 324 struct input_dev *dev = psmouse->dev; 325 unsigned char *packet = psmouse->packet; 326 unsigned int fingers, x1 = 0, y1 = 0, x2 = 0, y2 = 0; 327 unsigned int width = 0, pres = 0; 328 329 /* byte 0: n1 n0 . . . . R L */ 330 fingers = (packet[0] & 0xc0) >> 6; 331 332 switch (fingers) { 333 case 3: 334 /* 335 * Same as one finger, except report of more than 3 fingers: 336 * byte 3: n4 . w1 w0 . . . . 337 */ 338 if (packet[3] & 0x80) 339 fingers = 4; 340 /* fall through */ 341 case 1: 342 /* 343 * byte 1: . . . . x11 x10 x9 x8 344 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0 345 */ 346 x1 = ((packet[1] & 0x0f) << 8) | packet[2]; 347 /* 348 * byte 4: . . . . y11 y10 y9 y8 349 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0 350 */ 351 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]); 352 353 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4); 354 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4); 355 break; 356 357 case 2: 358 /* 359 * The coordinate of each finger is reported separately 360 * with a lower resolution for two finger touches: 361 * byte 0: . . ay8 ax8 . . . . 362 * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0 363 */ 364 x1 = (((packet[0] & 0x10) << 4) | packet[1]) << 2; 365 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */ 366 y1 = etd->y_max - 367 ((((packet[0] & 0x20) << 3) | packet[2]) << 2); 368 /* 369 * byte 3: . . by8 bx8 . . . . 370 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0 371 */ 372 x2 = (((packet[3] & 0x10) << 4) | packet[4]) << 2; 373 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */ 374 y2 = etd->y_max - 375 ((((packet[3] & 0x20) << 3) | packet[5]) << 2); 376 377 /* Unknown so just report sensible values */ 378 pres = 127; 379 width = 7; 380 break; 381 } 382 383 input_report_key(dev, BTN_TOUCH, fingers != 0); 384 if (fingers != 0) { 385 input_report_abs(dev, ABS_X, x1); 386 input_report_abs(dev, ABS_Y, y1); 387 } 388 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2); 389 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1); 390 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2); 391 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3); 392 input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4); 393 psmouse_report_standard_buttons(dev, packet[0]); 394 if (etd->info.reports_pressure) { 395 input_report_abs(dev, ABS_PRESSURE, pres); 396 input_report_abs(dev, ABS_TOOL_WIDTH, width); 397 } 398 399 input_sync(dev); 400 } 401 402 static void elantech_report_trackpoint(struct psmouse *psmouse, 403 int packet_type) 404 { 405 /* 406 * byte 0: 0 0 sx sy 0 M R L 407 * byte 1:~sx 0 0 0 0 0 0 0 408 * byte 2:~sy 0 0 0 0 0 0 0 409 * byte 3: 0 0 ~sy ~sx 0 1 1 0 410 * byte 4: x7 x6 x5 x4 x3 x2 x1 x0 411 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0 412 * 413 * x and y are written in two's complement spread 414 * over 9 bits with sx/sy the relative top bit and 415 * x7..x0 and y7..y0 the lower bits. 416 * The sign of y is opposite to what the input driver 417 * expects for a relative movement 418 */ 419 420 struct elantech_data *etd = psmouse->private; 421 struct input_dev *tp_dev = etd->tp_dev; 422 unsigned char *packet = psmouse->packet; 423 int x, y; 424 u32 t; 425 426 t = get_unaligned_le32(&packet[0]); 427 428 switch (t & ~7U) { 429 case 0x06000030U: 430 case 0x16008020U: 431 case 0x26800010U: 432 case 0x36808000U: 433 x = packet[4] - (int)((packet[1]^0x80) << 1); 434 y = (int)((packet[2]^0x80) << 1) - packet[5]; 435 436 psmouse_report_standard_buttons(tp_dev, packet[0]); 437 438 input_report_rel(tp_dev, REL_X, x); 439 input_report_rel(tp_dev, REL_Y, y); 440 441 input_sync(tp_dev); 442 443 break; 444 445 default: 446 /* Dump unexpected packet sequences if debug=1 (default) */ 447 if (etd->info.debug == 1) 448 elantech_packet_dump(psmouse); 449 450 break; 451 } 452 } 453 454 /* 455 * Interpret complete data packets and report absolute mode input events for 456 * hardware version 3. (12 byte packets for two fingers) 457 */ 458 static void elantech_report_absolute_v3(struct psmouse *psmouse, 459 int packet_type) 460 { 461 struct input_dev *dev = psmouse->dev; 462 struct elantech_data *etd = psmouse->private; 463 unsigned char *packet = psmouse->packet; 464 unsigned int fingers = 0, x1 = 0, y1 = 0, x2 = 0, y2 = 0; 465 unsigned int width = 0, pres = 0; 466 467 /* byte 0: n1 n0 . . . . R L */ 468 fingers = (packet[0] & 0xc0) >> 6; 469 470 switch (fingers) { 471 case 3: 472 case 1: 473 /* 474 * byte 1: . . . . x11 x10 x9 x8 475 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0 476 */ 477 x1 = ((packet[1] & 0x0f) << 8) | packet[2]; 478 /* 479 * byte 4: . . . . y11 y10 y9 y8 480 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0 481 */ 482 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]); 483 break; 484 485 case 2: 486 if (packet_type == PACKET_V3_HEAD) { 487 /* 488 * byte 1: . . . . ax11 ax10 ax9 ax8 489 * byte 2: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0 490 */ 491 etd->mt[0].x = ((packet[1] & 0x0f) << 8) | packet[2]; 492 /* 493 * byte 4: . . . . ay11 ay10 ay9 ay8 494 * byte 5: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 495 */ 496 etd->mt[0].y = etd->y_max - 497 (((packet[4] & 0x0f) << 8) | packet[5]); 498 /* 499 * wait for next packet 500 */ 501 return; 502 } 503 504 /* packet_type == PACKET_V3_TAIL */ 505 x1 = etd->mt[0].x; 506 y1 = etd->mt[0].y; 507 x2 = ((packet[1] & 0x0f) << 8) | packet[2]; 508 y2 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]); 509 break; 510 } 511 512 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4); 513 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4); 514 515 input_report_key(dev, BTN_TOUCH, fingers != 0); 516 if (fingers != 0) { 517 input_report_abs(dev, ABS_X, x1); 518 input_report_abs(dev, ABS_Y, y1); 519 } 520 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2); 521 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1); 522 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2); 523 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3); 524 525 /* For clickpads map both buttons to BTN_LEFT */ 526 if (etd->info.fw_version & 0x001000) 527 input_report_key(dev, BTN_LEFT, packet[0] & 0x03); 528 else 529 psmouse_report_standard_buttons(dev, packet[0]); 530 531 input_report_abs(dev, ABS_PRESSURE, pres); 532 input_report_abs(dev, ABS_TOOL_WIDTH, width); 533 534 input_sync(dev); 535 } 536 537 static void elantech_input_sync_v4(struct psmouse *psmouse) 538 { 539 struct input_dev *dev = psmouse->dev; 540 struct elantech_data *etd = psmouse->private; 541 unsigned char *packet = psmouse->packet; 542 543 /* For clickpads map both buttons to BTN_LEFT */ 544 if (etd->info.fw_version & 0x001000) 545 input_report_key(dev, BTN_LEFT, packet[0] & 0x03); 546 else 547 psmouse_report_standard_buttons(dev, packet[0]); 548 549 input_mt_report_pointer_emulation(dev, true); 550 input_sync(dev); 551 } 552 553 static void process_packet_status_v4(struct psmouse *psmouse) 554 { 555 struct input_dev *dev = psmouse->dev; 556 unsigned char *packet = psmouse->packet; 557 unsigned fingers; 558 int i; 559 560 /* notify finger state change */ 561 fingers = packet[1] & 0x1f; 562 for (i = 0; i < ETP_MAX_FINGERS; i++) { 563 if ((fingers & (1 << i)) == 0) { 564 input_mt_slot(dev, i); 565 input_mt_report_slot_state(dev, MT_TOOL_FINGER, false); 566 } 567 } 568 569 elantech_input_sync_v4(psmouse); 570 } 571 572 static void process_packet_head_v4(struct psmouse *psmouse) 573 { 574 struct input_dev *dev = psmouse->dev; 575 struct elantech_data *etd = psmouse->private; 576 unsigned char *packet = psmouse->packet; 577 int id = ((packet[3] & 0xe0) >> 5) - 1; 578 int pres, traces; 579 580 if (id < 0) 581 return; 582 583 etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2]; 584 etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]); 585 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4); 586 traces = (packet[0] & 0xf0) >> 4; 587 588 input_mt_slot(dev, id); 589 input_mt_report_slot_state(dev, MT_TOOL_FINGER, true); 590 591 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x); 592 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y); 593 input_report_abs(dev, ABS_MT_PRESSURE, pres); 594 input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->width); 595 /* report this for backwards compatibility */ 596 input_report_abs(dev, ABS_TOOL_WIDTH, traces); 597 598 elantech_input_sync_v4(psmouse); 599 } 600 601 static void process_packet_motion_v4(struct psmouse *psmouse) 602 { 603 struct input_dev *dev = psmouse->dev; 604 struct elantech_data *etd = psmouse->private; 605 unsigned char *packet = psmouse->packet; 606 int weight, delta_x1 = 0, delta_y1 = 0, delta_x2 = 0, delta_y2 = 0; 607 int id, sid; 608 609 id = ((packet[0] & 0xe0) >> 5) - 1; 610 if (id < 0) 611 return; 612 613 sid = ((packet[3] & 0xe0) >> 5) - 1; 614 weight = (packet[0] & 0x10) ? ETP_WEIGHT_VALUE : 1; 615 /* 616 * Motion packets give us the delta of x, y values of specific fingers, 617 * but in two's complement. Let the compiler do the conversion for us. 618 * Also _enlarge_ the numbers to int, in case of overflow. 619 */ 620 delta_x1 = (signed char)packet[1]; 621 delta_y1 = (signed char)packet[2]; 622 delta_x2 = (signed char)packet[4]; 623 delta_y2 = (signed char)packet[5]; 624 625 etd->mt[id].x += delta_x1 * weight; 626 etd->mt[id].y -= delta_y1 * weight; 627 input_mt_slot(dev, id); 628 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x); 629 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y); 630 631 if (sid >= 0) { 632 etd->mt[sid].x += delta_x2 * weight; 633 etd->mt[sid].y -= delta_y2 * weight; 634 input_mt_slot(dev, sid); 635 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[sid].x); 636 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[sid].y); 637 } 638 639 elantech_input_sync_v4(psmouse); 640 } 641 642 static void elantech_report_absolute_v4(struct psmouse *psmouse, 643 int packet_type) 644 { 645 switch (packet_type) { 646 case PACKET_V4_STATUS: 647 process_packet_status_v4(psmouse); 648 break; 649 650 case PACKET_V4_HEAD: 651 process_packet_head_v4(psmouse); 652 break; 653 654 case PACKET_V4_MOTION: 655 process_packet_motion_v4(psmouse); 656 break; 657 658 case PACKET_UNKNOWN: 659 default: 660 /* impossible to get here */ 661 break; 662 } 663 } 664 665 static int elantech_packet_check_v1(struct psmouse *psmouse) 666 { 667 struct elantech_data *etd = psmouse->private; 668 unsigned char *packet = psmouse->packet; 669 unsigned char p1, p2, p3; 670 671 /* Parity bits are placed differently */ 672 if (etd->info.fw_version < 0x020000) { 673 /* byte 0: D U p1 p2 1 p3 R L */ 674 p1 = (packet[0] & 0x20) >> 5; 675 p2 = (packet[0] & 0x10) >> 4; 676 } else { 677 /* byte 0: n1 n0 p2 p1 1 p3 R L */ 678 p1 = (packet[0] & 0x10) >> 4; 679 p2 = (packet[0] & 0x20) >> 5; 680 } 681 682 p3 = (packet[0] & 0x04) >> 2; 683 684 return etd->parity[packet[1]] == p1 && 685 etd->parity[packet[2]] == p2 && 686 etd->parity[packet[3]] == p3; 687 } 688 689 static int elantech_debounce_check_v2(struct psmouse *psmouse) 690 { 691 /* 692 * When we encounter packet that matches this exactly, it means the 693 * hardware is in debounce status. Just ignore the whole packet. 694 */ 695 static const u8 debounce_packet[] = { 696 0x84, 0xff, 0xff, 0x02, 0xff, 0xff 697 }; 698 unsigned char *packet = psmouse->packet; 699 700 return !memcmp(packet, debounce_packet, sizeof(debounce_packet)); 701 } 702 703 static int elantech_packet_check_v2(struct psmouse *psmouse) 704 { 705 struct elantech_data *etd = psmouse->private; 706 unsigned char *packet = psmouse->packet; 707 708 /* 709 * V2 hardware has two flavors. Older ones that do not report pressure, 710 * and newer ones that reports pressure and width. With newer ones, all 711 * packets (1, 2, 3 finger touch) have the same constant bits. With 712 * older ones, 1/3 finger touch packets and 2 finger touch packets 713 * have different constant bits. 714 * With all three cases, if the constant bits are not exactly what I 715 * expected, I consider them invalid. 716 */ 717 if (etd->info.reports_pressure) 718 return (packet[0] & 0x0c) == 0x04 && 719 (packet[3] & 0x0f) == 0x02; 720 721 if ((packet[0] & 0xc0) == 0x80) 722 return (packet[0] & 0x0c) == 0x0c && 723 (packet[3] & 0x0e) == 0x08; 724 725 return (packet[0] & 0x3c) == 0x3c && 726 (packet[1] & 0xf0) == 0x00 && 727 (packet[3] & 0x3e) == 0x38 && 728 (packet[4] & 0xf0) == 0x00; 729 } 730 731 /* 732 * We check the constant bits to determine what packet type we get, 733 * so packet checking is mandatory for v3 and later hardware. 734 */ 735 static int elantech_packet_check_v3(struct psmouse *psmouse) 736 { 737 struct elantech_data *etd = psmouse->private; 738 static const u8 debounce_packet[] = { 739 0xc4, 0xff, 0xff, 0x02, 0xff, 0xff 740 }; 741 unsigned char *packet = psmouse->packet; 742 743 /* 744 * check debounce first, it has the same signature in byte 0 745 * and byte 3 as PACKET_V3_HEAD. 746 */ 747 if (!memcmp(packet, debounce_packet, sizeof(debounce_packet))) 748 return PACKET_DEBOUNCE; 749 750 /* 751 * If the hardware flag 'crc_enabled' is set the packets have 752 * different signatures. 753 */ 754 if (etd->info.crc_enabled) { 755 if ((packet[3] & 0x09) == 0x08) 756 return PACKET_V3_HEAD; 757 758 if ((packet[3] & 0x09) == 0x09) 759 return PACKET_V3_TAIL; 760 } else { 761 if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0xcf) == 0x02) 762 return PACKET_V3_HEAD; 763 764 if ((packet[0] & 0x0c) == 0x0c && (packet[3] & 0xce) == 0x0c) 765 return PACKET_V3_TAIL; 766 if ((packet[3] & 0x0f) == 0x06) 767 return PACKET_TRACKPOINT; 768 } 769 770 return PACKET_UNKNOWN; 771 } 772 773 static int elantech_packet_check_v4(struct psmouse *psmouse) 774 { 775 struct elantech_data *etd = psmouse->private; 776 unsigned char *packet = psmouse->packet; 777 unsigned char packet_type = packet[3] & 0x03; 778 unsigned int ic_version; 779 bool sanity_check; 780 781 if (etd->tp_dev && (packet[3] & 0x0f) == 0x06) 782 return PACKET_TRACKPOINT; 783 784 /* This represents the version of IC body. */ 785 ic_version = (etd->info.fw_version & 0x0f0000) >> 16; 786 787 /* 788 * Sanity check based on the constant bits of a packet. 789 * The constant bits change depending on the value of 790 * the hardware flag 'crc_enabled' and the version of 791 * the IC body, but are the same for every packet, 792 * regardless of the type. 793 */ 794 if (etd->info.crc_enabled) 795 sanity_check = ((packet[3] & 0x08) == 0x00); 796 else if (ic_version == 7 && etd->info.samples[1] == 0x2A) 797 sanity_check = ((packet[3] & 0x1c) == 0x10); 798 else 799 sanity_check = ((packet[0] & 0x08) == 0x00 && 800 (packet[3] & 0x1c) == 0x10); 801 802 if (!sanity_check) 803 return PACKET_UNKNOWN; 804 805 switch (packet_type) { 806 case 0: 807 return PACKET_V4_STATUS; 808 809 case 1: 810 return PACKET_V4_HEAD; 811 812 case 2: 813 return PACKET_V4_MOTION; 814 } 815 816 return PACKET_UNKNOWN; 817 } 818 819 /* 820 * Process byte stream from mouse and handle complete packets 821 */ 822 static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse) 823 { 824 struct elantech_data *etd = psmouse->private; 825 int packet_type; 826 827 if (psmouse->pktcnt < psmouse->pktsize) 828 return PSMOUSE_GOOD_DATA; 829 830 if (etd->info.debug > 1) 831 elantech_packet_dump(psmouse); 832 833 switch (etd->info.hw_version) { 834 case 1: 835 if (etd->info.paritycheck && !elantech_packet_check_v1(psmouse)) 836 return PSMOUSE_BAD_DATA; 837 838 elantech_report_absolute_v1(psmouse); 839 break; 840 841 case 2: 842 /* ignore debounce */ 843 if (elantech_debounce_check_v2(psmouse)) 844 return PSMOUSE_FULL_PACKET; 845 846 if (etd->info.paritycheck && !elantech_packet_check_v2(psmouse)) 847 return PSMOUSE_BAD_DATA; 848 849 elantech_report_absolute_v2(psmouse); 850 break; 851 852 case 3: 853 packet_type = elantech_packet_check_v3(psmouse); 854 switch (packet_type) { 855 case PACKET_UNKNOWN: 856 return PSMOUSE_BAD_DATA; 857 858 case PACKET_DEBOUNCE: 859 /* ignore debounce */ 860 break; 861 862 case PACKET_TRACKPOINT: 863 elantech_report_trackpoint(psmouse, packet_type); 864 break; 865 866 default: 867 elantech_report_absolute_v3(psmouse, packet_type); 868 break; 869 } 870 871 break; 872 873 case 4: 874 packet_type = elantech_packet_check_v4(psmouse); 875 switch (packet_type) { 876 case PACKET_UNKNOWN: 877 return PSMOUSE_BAD_DATA; 878 879 case PACKET_TRACKPOINT: 880 elantech_report_trackpoint(psmouse, packet_type); 881 break; 882 883 default: 884 elantech_report_absolute_v4(psmouse, packet_type); 885 break; 886 } 887 888 break; 889 } 890 891 return PSMOUSE_FULL_PACKET; 892 } 893 894 /* 895 * This writes the reg_07 value again to the hardware at the end of every 896 * set_rate call because the register loses its value. reg_07 allows setting 897 * absolute mode on v4 hardware 898 */ 899 static void elantech_set_rate_restore_reg_07(struct psmouse *psmouse, 900 unsigned int rate) 901 { 902 struct elantech_data *etd = psmouse->private; 903 904 etd->original_set_rate(psmouse, rate); 905 if (elantech_write_reg(psmouse, 0x07, etd->reg_07)) 906 psmouse_err(psmouse, "restoring reg_07 failed\n"); 907 } 908 909 /* 910 * Put the touchpad into absolute mode 911 */ 912 static int elantech_set_absolute_mode(struct psmouse *psmouse) 913 { 914 struct elantech_data *etd = psmouse->private; 915 unsigned char val; 916 int tries = ETP_READ_BACK_TRIES; 917 int rc = 0; 918 919 switch (etd->info.hw_version) { 920 case 1: 921 etd->reg_10 = 0x16; 922 etd->reg_11 = 0x8f; 923 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) || 924 elantech_write_reg(psmouse, 0x11, etd->reg_11)) { 925 rc = -1; 926 } 927 break; 928 929 case 2: 930 /* Windows driver values */ 931 etd->reg_10 = 0x54; 932 etd->reg_11 = 0x88; /* 0x8a */ 933 etd->reg_21 = 0x60; /* 0x00 */ 934 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) || 935 elantech_write_reg(psmouse, 0x11, etd->reg_11) || 936 elantech_write_reg(psmouse, 0x21, etd->reg_21)) { 937 rc = -1; 938 } 939 break; 940 941 case 3: 942 if (etd->info.set_hw_resolution) 943 etd->reg_10 = 0x0b; 944 else 945 etd->reg_10 = 0x01; 946 947 if (elantech_write_reg(psmouse, 0x10, etd->reg_10)) 948 rc = -1; 949 950 break; 951 952 case 4: 953 etd->reg_07 = 0x01; 954 if (elantech_write_reg(psmouse, 0x07, etd->reg_07)) 955 rc = -1; 956 957 goto skip_readback_reg_10; /* v4 has no reg 0x10 to read */ 958 } 959 960 if (rc == 0) { 961 /* 962 * Read back reg 0x10. For hardware version 1 we must make 963 * sure the absolute mode bit is set. For hardware version 2 964 * the touchpad is probably initializing and not ready until 965 * we read back the value we just wrote. 966 */ 967 do { 968 rc = elantech_read_reg(psmouse, 0x10, &val); 969 if (rc == 0) 970 break; 971 tries--; 972 elantech_debug("retrying read (%d).\n", tries); 973 msleep(ETP_READ_BACK_DELAY); 974 } while (tries > 0); 975 976 if (rc) { 977 psmouse_err(psmouse, 978 "failed to read back register 0x10.\n"); 979 } else if (etd->info.hw_version == 1 && 980 !(val & ETP_R10_ABSOLUTE_MODE)) { 981 psmouse_err(psmouse, 982 "touchpad refuses to switch to absolute mode.\n"); 983 rc = -1; 984 } 985 } 986 987 skip_readback_reg_10: 988 if (rc) 989 psmouse_err(psmouse, "failed to initialise registers.\n"); 990 991 return rc; 992 } 993 994 static int elantech_set_range(struct psmouse *psmouse, 995 unsigned int *x_min, unsigned int *y_min, 996 unsigned int *x_max, unsigned int *y_max, 997 unsigned int *width) 998 { 999 struct elantech_data *etd = psmouse->private; 1000 struct elantech_device_info *info = &etd->info; 1001 unsigned char param[3]; 1002 unsigned char traces; 1003 1004 switch (info->hw_version) { 1005 case 1: 1006 *x_min = ETP_XMIN_V1; 1007 *y_min = ETP_YMIN_V1; 1008 *x_max = ETP_XMAX_V1; 1009 *y_max = ETP_YMAX_V1; 1010 break; 1011 1012 case 2: 1013 if (info->fw_version == 0x020800 || 1014 info->fw_version == 0x020b00 || 1015 info->fw_version == 0x020030) { 1016 *x_min = ETP_XMIN_V2; 1017 *y_min = ETP_YMIN_V2; 1018 *x_max = ETP_XMAX_V2; 1019 *y_max = ETP_YMAX_V2; 1020 } else { 1021 int i; 1022 int fixed_dpi; 1023 1024 i = (info->fw_version > 0x020800 && 1025 info->fw_version < 0x020900) ? 1 : 2; 1026 1027 if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param)) 1028 return -1; 1029 1030 fixed_dpi = param[1] & 0x10; 1031 1032 if (((info->fw_version >> 16) == 0x14) && fixed_dpi) { 1033 if (info->send_cmd(psmouse, ETP_SAMPLE_QUERY, param)) 1034 return -1; 1035 1036 *x_max = (info->capabilities[1] - i) * param[1] / 2; 1037 *y_max = (info->capabilities[2] - i) * param[2] / 2; 1038 } else if (info->fw_version == 0x040216) { 1039 *x_max = 819; 1040 *y_max = 405; 1041 } else if (info->fw_version == 0x040219 || info->fw_version == 0x040215) { 1042 *x_max = 900; 1043 *y_max = 500; 1044 } else { 1045 *x_max = (info->capabilities[1] - i) * 64; 1046 *y_max = (info->capabilities[2] - i) * 64; 1047 } 1048 } 1049 break; 1050 1051 case 3: 1052 if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param)) 1053 return -1; 1054 1055 *x_max = (0x0f & param[0]) << 8 | param[1]; 1056 *y_max = (0xf0 & param[0]) << 4 | param[2]; 1057 break; 1058 1059 case 4: 1060 if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param)) 1061 return -1; 1062 1063 *x_max = (0x0f & param[0]) << 8 | param[1]; 1064 *y_max = (0xf0 & param[0]) << 4 | param[2]; 1065 traces = info->capabilities[1]; 1066 if ((traces < 2) || (traces > *x_max)) 1067 return -1; 1068 1069 *width = *x_max / (traces - 1); 1070 break; 1071 } 1072 1073 return 0; 1074 } 1075 1076 /* 1077 * (value from firmware) * 10 + 790 = dpi 1078 * we also have to convert dpi to dots/mm (*10/254 to avoid floating point) 1079 */ 1080 static unsigned int elantech_convert_res(unsigned int val) 1081 { 1082 return (val * 10 + 790) * 10 / 254; 1083 } 1084 1085 static int elantech_get_resolution_v4(struct psmouse *psmouse, 1086 unsigned int *x_res, 1087 unsigned int *y_res, 1088 unsigned int *bus) 1089 { 1090 unsigned char param[3]; 1091 1092 if (elantech_send_cmd(psmouse, ETP_RESOLUTION_QUERY, param)) 1093 return -1; 1094 1095 *x_res = elantech_convert_res(param[1] & 0x0f); 1096 *y_res = elantech_convert_res((param[1] & 0xf0) >> 4); 1097 *bus = param[2]; 1098 1099 return 0; 1100 } 1101 1102 /* 1103 * Advertise INPUT_PROP_BUTTONPAD for clickpads. The testing of bit 12 in 1104 * fw_version for this is based on the following fw_version & caps table: 1105 * 1106 * Laptop-model: fw_version: caps: buttons: 1107 * Acer S3 0x461f00 10, 13, 0e clickpad 1108 * Acer S7-392 0x581f01 50, 17, 0d clickpad 1109 * Acer V5-131 0x461f02 01, 16, 0c clickpad 1110 * Acer V5-551 0x461f00 ? clickpad 1111 * Asus K53SV 0x450f01 78, 15, 0c 2 hw buttons 1112 * Asus G46VW 0x460f02 00, 18, 0c 2 hw buttons 1113 * Asus G750JX 0x360f00 00, 16, 0c 2 hw buttons 1114 * Asus TP500LN 0x381f17 10, 14, 0e clickpad 1115 * Asus X750JN 0x381f17 10, 14, 0e clickpad 1116 * Asus UX31 0x361f00 20, 15, 0e clickpad 1117 * Asus UX32VD 0x361f02 00, 15, 0e clickpad 1118 * Avatar AVIU-145A2 0x361f00 ? clickpad 1119 * Fujitsu CELSIUS H760 0x570f02 40, 14, 0c 3 hw buttons (**) 1120 * Fujitsu CELSIUS H780 0x5d0f02 41, 16, 0d 3 hw buttons (**) 1121 * Fujitsu LIFEBOOK E544 0x470f00 d0, 12, 09 2 hw buttons 1122 * Fujitsu LIFEBOOK E546 0x470f00 50, 12, 09 2 hw buttons 1123 * Fujitsu LIFEBOOK E547 0x470f00 50, 12, 09 2 hw buttons 1124 * Fujitsu LIFEBOOK E554 0x570f01 40, 14, 0c 2 hw buttons 1125 * Fujitsu LIFEBOOK E557 0x570f01 40, 14, 0c 2 hw buttons 1126 * Fujitsu T725 0x470f01 05, 12, 09 2 hw buttons 1127 * Fujitsu H730 0x570f00 c0, 14, 0c 3 hw buttons (**) 1128 * Gigabyte U2442 0x450f01 58, 17, 0c 2 hw buttons 1129 * Lenovo L430 0x350f02 b9, 15, 0c 2 hw buttons (*) 1130 * Lenovo L530 0x350f02 b9, 15, 0c 2 hw buttons (*) 1131 * Samsung NF210 0x150b00 78, 14, 0a 2 hw buttons 1132 * Samsung NP770Z5E 0x575f01 10, 15, 0f clickpad 1133 * Samsung NP700Z5B 0x361f06 21, 15, 0f clickpad 1134 * Samsung NP900X3E-A02 0x575f03 ? clickpad 1135 * Samsung NP-QX410 0x851b00 19, 14, 0c clickpad 1136 * Samsung RC512 0x450f00 08, 15, 0c 2 hw buttons 1137 * Samsung RF710 0x450f00 ? 2 hw buttons 1138 * System76 Pangolin 0x250f01 ? 2 hw buttons 1139 * (*) + 3 trackpoint buttons 1140 * (**) + 0 trackpoint buttons 1141 * Note: Lenovo L430 and Lenovo L530 have the same fw_version/caps 1142 */ 1143 static void elantech_set_buttonpad_prop(struct psmouse *psmouse) 1144 { 1145 struct input_dev *dev = psmouse->dev; 1146 struct elantech_data *etd = psmouse->private; 1147 1148 if (etd->info.fw_version & 0x001000) { 1149 __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit); 1150 __clear_bit(BTN_RIGHT, dev->keybit); 1151 } 1152 } 1153 1154 /* 1155 * Some hw_version 4 models do have a middle button 1156 */ 1157 static const struct dmi_system_id elantech_dmi_has_middle_button[] = { 1158 #if defined(CONFIG_DMI) && defined(CONFIG_X86) 1159 { 1160 /* Fujitsu H730 has a middle button */ 1161 .matches = { 1162 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1163 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"), 1164 }, 1165 }, 1166 { 1167 /* Fujitsu H760 also has a middle button */ 1168 .matches = { 1169 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1170 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H760"), 1171 }, 1172 }, 1173 { 1174 /* Fujitsu H780 also has a middle button */ 1175 .matches = { 1176 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1177 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H780"), 1178 }, 1179 }, 1180 #endif 1181 { } 1182 }; 1183 1184 static const char * const middle_button_pnp_ids[] = { 1185 "LEN2131", /* ThinkPad P52 w/ NFC */ 1186 "LEN2132", /* ThinkPad P52 */ 1187 "LEN2133", /* ThinkPad P72 w/ NFC */ 1188 "LEN2134", /* ThinkPad P72 */ 1189 "LEN0407", 1190 "LEN0408", 1191 NULL 1192 }; 1193 1194 /* 1195 * Set the appropriate event bits for the input subsystem 1196 */ 1197 static int elantech_set_input_params(struct psmouse *psmouse) 1198 { 1199 struct input_dev *dev = psmouse->dev; 1200 struct elantech_data *etd = psmouse->private; 1201 struct elantech_device_info *info = &etd->info; 1202 unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0; 1203 1204 if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width)) 1205 return -1; 1206 1207 __set_bit(INPUT_PROP_POINTER, dev->propbit); 1208 __set_bit(EV_KEY, dev->evbit); 1209 __set_bit(EV_ABS, dev->evbit); 1210 __clear_bit(EV_REL, dev->evbit); 1211 1212 __set_bit(BTN_LEFT, dev->keybit); 1213 if (dmi_check_system(elantech_dmi_has_middle_button) || 1214 psmouse_matches_pnp_id(psmouse, middle_button_pnp_ids)) 1215 __set_bit(BTN_MIDDLE, dev->keybit); 1216 __set_bit(BTN_RIGHT, dev->keybit); 1217 1218 __set_bit(BTN_TOUCH, dev->keybit); 1219 __set_bit(BTN_TOOL_FINGER, dev->keybit); 1220 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit); 1221 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit); 1222 1223 switch (info->hw_version) { 1224 case 1: 1225 /* Rocker button */ 1226 if (info->fw_version < 0x020000 && 1227 (info->capabilities[0] & ETP_CAP_HAS_ROCKER)) { 1228 __set_bit(BTN_FORWARD, dev->keybit); 1229 __set_bit(BTN_BACK, dev->keybit); 1230 } 1231 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0); 1232 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0); 1233 break; 1234 1235 case 2: 1236 __set_bit(BTN_TOOL_QUADTAP, dev->keybit); 1237 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit); 1238 /* fall through */ 1239 case 3: 1240 if (info->hw_version == 3) 1241 elantech_set_buttonpad_prop(psmouse); 1242 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0); 1243 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0); 1244 if (info->reports_pressure) { 1245 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2, 1246 ETP_PMAX_V2, 0, 0); 1247 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2, 1248 ETP_WMAX_V2, 0, 0); 1249 } 1250 input_mt_init_slots(dev, 2, INPUT_MT_SEMI_MT); 1251 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0); 1252 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0); 1253 break; 1254 1255 case 4: 1256 elantech_set_buttonpad_prop(psmouse); 1257 __set_bit(BTN_TOOL_QUADTAP, dev->keybit); 1258 /* For X to recognize me as touchpad. */ 1259 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0); 1260 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0); 1261 /* 1262 * range of pressure and width is the same as v2, 1263 * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility. 1264 */ 1265 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2, 1266 ETP_PMAX_V2, 0, 0); 1267 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2, 1268 ETP_WMAX_V2, 0, 0); 1269 /* Multitouch capable pad, up to 5 fingers. */ 1270 input_mt_init_slots(dev, ETP_MAX_FINGERS, 0); 1271 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0); 1272 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0); 1273 input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2, 1274 ETP_PMAX_V2, 0, 0); 1275 /* 1276 * The firmware reports how many trace lines the finger spans, 1277 * convert to surface unit as Protocol-B requires. 1278 */ 1279 input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0, 1280 ETP_WMAX_V2 * width, 0, 0); 1281 break; 1282 } 1283 1284 input_abs_set_res(dev, ABS_X, info->x_res); 1285 input_abs_set_res(dev, ABS_Y, info->y_res); 1286 if (info->hw_version > 1) { 1287 input_abs_set_res(dev, ABS_MT_POSITION_X, info->x_res); 1288 input_abs_set_res(dev, ABS_MT_POSITION_Y, info->y_res); 1289 } 1290 1291 etd->y_max = y_max; 1292 etd->width = width; 1293 1294 return 0; 1295 } 1296 1297 struct elantech_attr_data { 1298 size_t field_offset; 1299 unsigned char reg; 1300 }; 1301 1302 /* 1303 * Display a register value by reading a sysfs entry 1304 */ 1305 static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data, 1306 char *buf) 1307 { 1308 struct elantech_data *etd = psmouse->private; 1309 struct elantech_attr_data *attr = data; 1310 unsigned char *reg = (unsigned char *) etd + attr->field_offset; 1311 int rc = 0; 1312 1313 if (attr->reg) 1314 rc = elantech_read_reg(psmouse, attr->reg, reg); 1315 1316 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg); 1317 } 1318 1319 /* 1320 * Write a register value by writing a sysfs entry 1321 */ 1322 static ssize_t elantech_set_int_attr(struct psmouse *psmouse, 1323 void *data, const char *buf, size_t count) 1324 { 1325 struct elantech_data *etd = psmouse->private; 1326 struct elantech_attr_data *attr = data; 1327 unsigned char *reg = (unsigned char *) etd + attr->field_offset; 1328 unsigned char value; 1329 int err; 1330 1331 err = kstrtou8(buf, 16, &value); 1332 if (err) 1333 return err; 1334 1335 /* Do we need to preserve some bits for version 2 hardware too? */ 1336 if (etd->info.hw_version == 1) { 1337 if (attr->reg == 0x10) 1338 /* Force absolute mode always on */ 1339 value |= ETP_R10_ABSOLUTE_MODE; 1340 else if (attr->reg == 0x11) 1341 /* Force 4 byte mode always on */ 1342 value |= ETP_R11_4_BYTE_MODE; 1343 } 1344 1345 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0) 1346 *reg = value; 1347 1348 return count; 1349 } 1350 1351 #define ELANTECH_INT_ATTR(_name, _register) \ 1352 static struct elantech_attr_data elantech_attr_##_name = { \ 1353 .field_offset = offsetof(struct elantech_data, _name), \ 1354 .reg = _register, \ 1355 }; \ 1356 PSMOUSE_DEFINE_ATTR(_name, 0644, \ 1357 &elantech_attr_##_name, \ 1358 elantech_show_int_attr, \ 1359 elantech_set_int_attr) 1360 1361 #define ELANTECH_INFO_ATTR(_name) \ 1362 static struct elantech_attr_data elantech_attr_##_name = { \ 1363 .field_offset = offsetof(struct elantech_data, info) + \ 1364 offsetof(struct elantech_device_info, _name), \ 1365 .reg = 0, \ 1366 }; \ 1367 PSMOUSE_DEFINE_ATTR(_name, 0644, \ 1368 &elantech_attr_##_name, \ 1369 elantech_show_int_attr, \ 1370 elantech_set_int_attr) 1371 1372 ELANTECH_INT_ATTR(reg_07, 0x07); 1373 ELANTECH_INT_ATTR(reg_10, 0x10); 1374 ELANTECH_INT_ATTR(reg_11, 0x11); 1375 ELANTECH_INT_ATTR(reg_20, 0x20); 1376 ELANTECH_INT_ATTR(reg_21, 0x21); 1377 ELANTECH_INT_ATTR(reg_22, 0x22); 1378 ELANTECH_INT_ATTR(reg_23, 0x23); 1379 ELANTECH_INT_ATTR(reg_24, 0x24); 1380 ELANTECH_INT_ATTR(reg_25, 0x25); 1381 ELANTECH_INT_ATTR(reg_26, 0x26); 1382 ELANTECH_INFO_ATTR(debug); 1383 ELANTECH_INFO_ATTR(paritycheck); 1384 ELANTECH_INFO_ATTR(crc_enabled); 1385 1386 static struct attribute *elantech_attrs[] = { 1387 &psmouse_attr_reg_07.dattr.attr, 1388 &psmouse_attr_reg_10.dattr.attr, 1389 &psmouse_attr_reg_11.dattr.attr, 1390 &psmouse_attr_reg_20.dattr.attr, 1391 &psmouse_attr_reg_21.dattr.attr, 1392 &psmouse_attr_reg_22.dattr.attr, 1393 &psmouse_attr_reg_23.dattr.attr, 1394 &psmouse_attr_reg_24.dattr.attr, 1395 &psmouse_attr_reg_25.dattr.attr, 1396 &psmouse_attr_reg_26.dattr.attr, 1397 &psmouse_attr_debug.dattr.attr, 1398 &psmouse_attr_paritycheck.dattr.attr, 1399 &psmouse_attr_crc_enabled.dattr.attr, 1400 NULL 1401 }; 1402 1403 static const struct attribute_group elantech_attr_group = { 1404 .attrs = elantech_attrs, 1405 }; 1406 1407 static bool elantech_is_signature_valid(const unsigned char *param) 1408 { 1409 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 }; 1410 int i; 1411 1412 if (param[0] == 0) 1413 return false; 1414 1415 if (param[1] == 0) 1416 return true; 1417 1418 /* 1419 * Some hw_version >= 4 models have a revision higher then 20. Meaning 1420 * that param[2] may be 10 or 20, skip the rates check for these. 1421 */ 1422 if ((param[0] & 0x0f) >= 0x06 && (param[1] & 0xaf) == 0x0f && 1423 param[2] < 40) 1424 return true; 1425 1426 for (i = 0; i < ARRAY_SIZE(rates); i++) 1427 if (param[2] == rates[i]) 1428 return false; 1429 1430 return true; 1431 } 1432 1433 /* 1434 * Use magic knock to detect Elantech touchpad 1435 */ 1436 int elantech_detect(struct psmouse *psmouse, bool set_properties) 1437 { 1438 struct ps2dev *ps2dev = &psmouse->ps2dev; 1439 unsigned char param[3]; 1440 1441 ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS); 1442 1443 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) || 1444 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || 1445 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || 1446 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || 1447 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) { 1448 psmouse_dbg(psmouse, "sending Elantech magic knock failed.\n"); 1449 return -1; 1450 } 1451 1452 /* 1453 * Report this in case there are Elantech models that use a different 1454 * set of magic numbers 1455 */ 1456 if (param[0] != 0x3c || param[1] != 0x03 || 1457 (param[2] != 0xc8 && param[2] != 0x00)) { 1458 psmouse_dbg(psmouse, 1459 "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n", 1460 param[0], param[1], param[2]); 1461 return -1; 1462 } 1463 1464 /* 1465 * Query touchpad's firmware version and see if it reports known 1466 * value to avoid mis-detection. Logitech mice are known to respond 1467 * to Elantech magic knock and there might be more. 1468 */ 1469 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) { 1470 psmouse_dbg(psmouse, "failed to query firmware version.\n"); 1471 return -1; 1472 } 1473 1474 psmouse_dbg(psmouse, 1475 "Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n", 1476 param[0], param[1], param[2]); 1477 1478 if (!elantech_is_signature_valid(param)) { 1479 psmouse_dbg(psmouse, 1480 "Probably not a real Elantech touchpad. Aborting.\n"); 1481 return -1; 1482 } 1483 1484 if (set_properties) { 1485 psmouse->vendor = "Elantech"; 1486 psmouse->name = "Touchpad"; 1487 } 1488 1489 return 0; 1490 } 1491 1492 /* 1493 * Clean up sysfs entries when disconnecting 1494 */ 1495 static void elantech_disconnect(struct psmouse *psmouse) 1496 { 1497 struct elantech_data *etd = psmouse->private; 1498 1499 /* 1500 * We might have left a breadcrumb when trying to 1501 * set up SMbus companion. 1502 */ 1503 psmouse_smbus_cleanup(psmouse); 1504 1505 if (etd->tp_dev) 1506 input_unregister_device(etd->tp_dev); 1507 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, 1508 &elantech_attr_group); 1509 kfree(psmouse->private); 1510 psmouse->private = NULL; 1511 } 1512 1513 /* 1514 * Put the touchpad back into absolute mode when reconnecting 1515 */ 1516 static int elantech_reconnect(struct psmouse *psmouse) 1517 { 1518 psmouse_reset(psmouse); 1519 1520 if (elantech_detect(psmouse, 0)) 1521 return -1; 1522 1523 if (elantech_set_absolute_mode(psmouse)) { 1524 psmouse_err(psmouse, 1525 "failed to put touchpad back into absolute mode.\n"); 1526 return -1; 1527 } 1528 1529 return 0; 1530 } 1531 1532 /* 1533 * Some hw_version 4 models do not work with crc_disabled 1534 */ 1535 static const struct dmi_system_id elantech_dmi_force_crc_enabled[] = { 1536 #if defined(CONFIG_DMI) && defined(CONFIG_X86) 1537 { 1538 /* Fujitsu H730 does not work with crc_enabled == 0 */ 1539 .matches = { 1540 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1541 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"), 1542 }, 1543 }, 1544 { 1545 /* Fujitsu H760 does not work with crc_enabled == 0 */ 1546 .matches = { 1547 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1548 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H760"), 1549 }, 1550 }, 1551 { 1552 /* Fujitsu LIFEBOOK E544 does not work with crc_enabled == 0 */ 1553 .matches = { 1554 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1555 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E544"), 1556 }, 1557 }, 1558 { 1559 /* Fujitsu LIFEBOOK E546 does not work with crc_enabled == 0 */ 1560 .matches = { 1561 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1562 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E546"), 1563 }, 1564 }, 1565 { 1566 /* Fujitsu LIFEBOOK E547 does not work with crc_enabled == 0 */ 1567 .matches = { 1568 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1569 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E547"), 1570 }, 1571 }, 1572 { 1573 /* Fujitsu LIFEBOOK E554 does not work with crc_enabled == 0 */ 1574 .matches = { 1575 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1576 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E554"), 1577 }, 1578 }, 1579 { 1580 /* Fujitsu LIFEBOOK E556 does not work with crc_enabled == 0 */ 1581 .matches = { 1582 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1583 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E556"), 1584 }, 1585 }, 1586 { 1587 /* Fujitsu LIFEBOOK E557 does not work with crc_enabled == 0 */ 1588 .matches = { 1589 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1590 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E557"), 1591 }, 1592 }, 1593 { 1594 /* Fujitsu LIFEBOOK U745 does not work with crc_enabled == 0 */ 1595 .matches = { 1596 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1597 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK U745"), 1598 }, 1599 }, 1600 #endif 1601 { } 1602 }; 1603 1604 /* 1605 * Some hw_version 3 models go into error state when we try to set 1606 * bit 3 and/or bit 1 of r10. 1607 */ 1608 static const struct dmi_system_id no_hw_res_dmi_table[] = { 1609 #if defined(CONFIG_DMI) && defined(CONFIG_X86) 1610 { 1611 /* Gigabyte U2442 */ 1612 .matches = { 1613 DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"), 1614 DMI_MATCH(DMI_PRODUCT_NAME, "U2442"), 1615 }, 1616 }, 1617 #endif 1618 { } 1619 }; 1620 1621 /* 1622 * determine hardware version and set some properties according to it. 1623 */ 1624 static int elantech_set_properties(struct elantech_device_info *info) 1625 { 1626 /* This represents the version of IC body. */ 1627 int ver = (info->fw_version & 0x0f0000) >> 16; 1628 1629 /* Early version of Elan touchpads doesn't obey the rule. */ 1630 if (info->fw_version < 0x020030 || info->fw_version == 0x020600) 1631 info->hw_version = 1; 1632 else { 1633 switch (ver) { 1634 case 2: 1635 case 4: 1636 info->hw_version = 2; 1637 break; 1638 case 5: 1639 info->hw_version = 3; 1640 break; 1641 case 6 ... 15: 1642 info->hw_version = 4; 1643 break; 1644 default: 1645 return -1; 1646 } 1647 } 1648 1649 /* decide which send_cmd we're gonna use early */ 1650 info->send_cmd = info->hw_version >= 3 ? elantech_send_cmd : 1651 synaptics_send_cmd; 1652 1653 /* Turn on packet checking by default */ 1654 info->paritycheck = 1; 1655 1656 /* 1657 * This firmware suffers from misreporting coordinates when 1658 * a touch action starts causing the mouse cursor or scrolled page 1659 * to jump. Enable a workaround. 1660 */ 1661 info->jumpy_cursor = 1662 (info->fw_version == 0x020022 || info->fw_version == 0x020600); 1663 1664 if (info->hw_version > 1) { 1665 /* For now show extra debug information */ 1666 info->debug = 1; 1667 1668 if (info->fw_version >= 0x020800) 1669 info->reports_pressure = true; 1670 } 1671 1672 /* 1673 * The signatures of v3 and v4 packets change depending on the 1674 * value of this hardware flag. 1675 */ 1676 info->crc_enabled = (info->fw_version & 0x4000) == 0x4000 || 1677 dmi_check_system(elantech_dmi_force_crc_enabled); 1678 1679 /* Enable real hardware resolution on hw_version 3 ? */ 1680 info->set_hw_resolution = !dmi_check_system(no_hw_res_dmi_table); 1681 1682 return 0; 1683 } 1684 1685 static int elantech_query_info(struct psmouse *psmouse, 1686 struct elantech_device_info *info) 1687 { 1688 unsigned char param[3]; 1689 1690 memset(info, 0, sizeof(*info)); 1691 1692 /* 1693 * Do the version query again so we can store the result 1694 */ 1695 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) { 1696 psmouse_err(psmouse, "failed to query firmware version.\n"); 1697 return -EINVAL; 1698 } 1699 info->fw_version = (param[0] << 16) | (param[1] << 8) | param[2]; 1700 1701 if (elantech_set_properties(info)) { 1702 psmouse_err(psmouse, "unknown hardware version, aborting...\n"); 1703 return -EINVAL; 1704 } 1705 psmouse_info(psmouse, 1706 "assuming hardware version %d (with firmware version 0x%02x%02x%02x)\n", 1707 info->hw_version, param[0], param[1], param[2]); 1708 1709 if (info->send_cmd(psmouse, ETP_CAPABILITIES_QUERY, 1710 info->capabilities)) { 1711 psmouse_err(psmouse, "failed to query capabilities.\n"); 1712 return -EINVAL; 1713 } 1714 psmouse_info(psmouse, 1715 "Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n", 1716 info->capabilities[0], info->capabilities[1], 1717 info->capabilities[2]); 1718 1719 if (info->hw_version != 1) { 1720 if (info->send_cmd(psmouse, ETP_SAMPLE_QUERY, info->samples)) { 1721 psmouse_err(psmouse, "failed to query sample data\n"); 1722 return -EINVAL; 1723 } 1724 psmouse_info(psmouse, 1725 "Elan sample query result %02x, %02x, %02x\n", 1726 info->samples[0], 1727 info->samples[1], 1728 info->samples[2]); 1729 } 1730 1731 if (info->samples[1] == 0x74 && info->hw_version == 0x03) { 1732 /* 1733 * This module has a bug which makes absolute mode 1734 * unusable, so let's abort so we'll be using standard 1735 * PS/2 protocol. 1736 */ 1737 psmouse_info(psmouse, 1738 "absolute mode broken, forcing standard PS/2 protocol\n"); 1739 return -ENODEV; 1740 } 1741 1742 /* The MSB indicates the presence of the trackpoint */ 1743 info->has_trackpoint = (info->capabilities[0] & 0x80) == 0x80; 1744 1745 info->x_res = 31; 1746 info->y_res = 31; 1747 if (info->hw_version == 4) { 1748 if (elantech_get_resolution_v4(psmouse, 1749 &info->x_res, 1750 &info->y_res, 1751 &info->bus)) { 1752 psmouse_warn(psmouse, 1753 "failed to query resolution data.\n"); 1754 } 1755 } 1756 1757 return 0; 1758 } 1759 1760 #if defined(CONFIG_MOUSE_PS2_ELANTECH_SMBUS) 1761 1762 /* 1763 * The newest Elantech device can use a secondary bus (over SMBus) which 1764 * provides a better bandwidth and allow a better control of the touchpads. 1765 * This is used to decide if we need to use this bus or not. 1766 */ 1767 enum { 1768 ELANTECH_SMBUS_NOT_SET = -1, 1769 ELANTECH_SMBUS_OFF, 1770 ELANTECH_SMBUS_ON, 1771 }; 1772 1773 static int elantech_smbus = IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) ? 1774 ELANTECH_SMBUS_NOT_SET : ELANTECH_SMBUS_OFF; 1775 module_param_named(elantech_smbus, elantech_smbus, int, 0644); 1776 MODULE_PARM_DESC(elantech_smbus, "Use a secondary bus for the Elantech device."); 1777 1778 static const char * const i2c_blacklist_pnp_ids[] = { 1779 /* 1780 * These are known to not be working properly as bits are missing 1781 * in elan_i2c. 1782 */ 1783 "LEN2131", /* ThinkPad P52 w/ NFC */ 1784 "LEN2132", /* ThinkPad P52 */ 1785 "LEN2133", /* ThinkPad P72 w/ NFC */ 1786 "LEN2134", /* ThinkPad P72 */ 1787 NULL 1788 }; 1789 1790 static int elantech_create_smbus(struct psmouse *psmouse, 1791 struct elantech_device_info *info, 1792 bool leave_breadcrumbs) 1793 { 1794 const struct property_entry i2c_properties[] = { 1795 PROPERTY_ENTRY_BOOL("elan,trackpoint"), 1796 { }, 1797 }; 1798 struct i2c_board_info smbus_board = { 1799 I2C_BOARD_INFO("elan_i2c", 0x15), 1800 .flags = I2C_CLIENT_HOST_NOTIFY, 1801 }; 1802 1803 if (info->has_trackpoint) 1804 smbus_board.properties = i2c_properties; 1805 1806 return psmouse_smbus_init(psmouse, &smbus_board, NULL, 0, false, 1807 leave_breadcrumbs); 1808 } 1809 1810 /** 1811 * elantech_setup_smbus - called once the PS/2 devices are enumerated 1812 * and decides to instantiate a SMBus InterTouch device. 1813 */ 1814 static int elantech_setup_smbus(struct psmouse *psmouse, 1815 struct elantech_device_info *info, 1816 bool leave_breadcrumbs) 1817 { 1818 int error; 1819 1820 if (elantech_smbus == ELANTECH_SMBUS_OFF) 1821 return -ENXIO; 1822 1823 if (elantech_smbus == ELANTECH_SMBUS_NOT_SET) { 1824 /* 1825 * New ICs are enabled by default, unless mentioned in 1826 * i2c_blacklist_pnp_ids. 1827 * Old ICs are up to the user to decide. 1828 */ 1829 if (!ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version) || 1830 psmouse_matches_pnp_id(psmouse, i2c_blacklist_pnp_ids)) 1831 return -ENXIO; 1832 } 1833 1834 psmouse_info(psmouse, "Trying to set up SMBus access\n"); 1835 1836 error = elantech_create_smbus(psmouse, info, leave_breadcrumbs); 1837 if (error) { 1838 if (error == -EAGAIN) 1839 psmouse_info(psmouse, "SMbus companion is not ready yet\n"); 1840 else 1841 psmouse_err(psmouse, "unable to create intertouch device\n"); 1842 1843 return error; 1844 } 1845 1846 return 0; 1847 } 1848 1849 static bool elantech_use_host_notify(struct psmouse *psmouse, 1850 struct elantech_device_info *info) 1851 { 1852 if (ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version)) 1853 return true; 1854 1855 switch (info->bus) { 1856 case ETP_BUS_PS2_ONLY: 1857 /* expected case */ 1858 break; 1859 case ETP_BUS_SMB_ALERT_ONLY: 1860 /* fall-through */ 1861 case ETP_BUS_PS2_SMB_ALERT: 1862 psmouse_dbg(psmouse, "Ignoring SMBus provider through alert protocol.\n"); 1863 break; 1864 case ETP_BUS_SMB_HST_NTFY_ONLY: 1865 /* fall-through */ 1866 case ETP_BUS_PS2_SMB_HST_NTFY: 1867 return true; 1868 default: 1869 psmouse_dbg(psmouse, 1870 "Ignoring SMBus bus provider %d.\n", 1871 info->bus); 1872 } 1873 1874 return false; 1875 } 1876 1877 int elantech_init_smbus(struct psmouse *psmouse) 1878 { 1879 struct elantech_device_info info; 1880 int error = -EINVAL; 1881 1882 psmouse_reset(psmouse); 1883 1884 error = elantech_query_info(psmouse, &info); 1885 if (error) 1886 goto init_fail; 1887 1888 if (info.hw_version < 4) { 1889 error = -ENXIO; 1890 goto init_fail; 1891 } 1892 1893 return elantech_create_smbus(psmouse, &info, false); 1894 init_fail: 1895 psmouse_reset(psmouse); 1896 return error; 1897 } 1898 #endif /* CONFIG_MOUSE_PS2_ELANTECH_SMBUS */ 1899 1900 /* 1901 * Initialize the touchpad and create sysfs entries 1902 */ 1903 static int elantech_setup_ps2(struct psmouse *psmouse, 1904 struct elantech_device_info *info) 1905 { 1906 struct elantech_data *etd; 1907 int i; 1908 int error = -EINVAL; 1909 struct input_dev *tp_dev; 1910 1911 psmouse->private = etd = kzalloc(sizeof(*etd), GFP_KERNEL); 1912 if (!etd) 1913 return -ENOMEM; 1914 1915 etd->info = *info; 1916 1917 etd->parity[0] = 1; 1918 for (i = 1; i < 256; i++) 1919 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1; 1920 1921 if (elantech_set_absolute_mode(psmouse)) { 1922 psmouse_err(psmouse, 1923 "failed to put touchpad into absolute mode.\n"); 1924 goto init_fail; 1925 } 1926 1927 if (info->fw_version == 0x381f17) { 1928 etd->original_set_rate = psmouse->set_rate; 1929 psmouse->set_rate = elantech_set_rate_restore_reg_07; 1930 } 1931 1932 if (elantech_set_input_params(psmouse)) { 1933 psmouse_err(psmouse, "failed to query touchpad range.\n"); 1934 goto init_fail; 1935 } 1936 1937 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj, 1938 &elantech_attr_group); 1939 if (error) { 1940 psmouse_err(psmouse, 1941 "failed to create sysfs attributes, error: %d.\n", 1942 error); 1943 goto init_fail; 1944 } 1945 1946 if (info->has_trackpoint) { 1947 tp_dev = input_allocate_device(); 1948 1949 if (!tp_dev) { 1950 error = -ENOMEM; 1951 goto init_fail_tp_alloc; 1952 } 1953 1954 etd->tp_dev = tp_dev; 1955 snprintf(etd->tp_phys, sizeof(etd->tp_phys), "%s/input1", 1956 psmouse->ps2dev.serio->phys); 1957 tp_dev->phys = etd->tp_phys; 1958 tp_dev->name = "ETPS/2 Elantech TrackPoint"; 1959 tp_dev->id.bustype = BUS_I8042; 1960 tp_dev->id.vendor = 0x0002; 1961 tp_dev->id.product = PSMOUSE_ELANTECH; 1962 tp_dev->id.version = 0x0000; 1963 tp_dev->dev.parent = &psmouse->ps2dev.serio->dev; 1964 tp_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); 1965 tp_dev->relbit[BIT_WORD(REL_X)] = 1966 BIT_MASK(REL_X) | BIT_MASK(REL_Y); 1967 tp_dev->keybit[BIT_WORD(BTN_LEFT)] = 1968 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | 1969 BIT_MASK(BTN_RIGHT); 1970 1971 __set_bit(INPUT_PROP_POINTER, tp_dev->propbit); 1972 __set_bit(INPUT_PROP_POINTING_STICK, tp_dev->propbit); 1973 1974 error = input_register_device(etd->tp_dev); 1975 if (error < 0) 1976 goto init_fail_tp_reg; 1977 } 1978 1979 psmouse->protocol_handler = elantech_process_byte; 1980 psmouse->disconnect = elantech_disconnect; 1981 psmouse->reconnect = elantech_reconnect; 1982 psmouse->pktsize = info->hw_version > 1 ? 6 : 4; 1983 1984 return 0; 1985 init_fail_tp_reg: 1986 input_free_device(tp_dev); 1987 init_fail_tp_alloc: 1988 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, 1989 &elantech_attr_group); 1990 init_fail: 1991 kfree(etd); 1992 return error; 1993 } 1994 1995 int elantech_init_ps2(struct psmouse *psmouse) 1996 { 1997 struct elantech_device_info info; 1998 int error = -EINVAL; 1999 2000 psmouse_reset(psmouse); 2001 2002 error = elantech_query_info(psmouse, &info); 2003 if (error) 2004 goto init_fail; 2005 2006 error = elantech_setup_ps2(psmouse, &info); 2007 if (error) 2008 goto init_fail; 2009 2010 return 0; 2011 init_fail: 2012 psmouse_reset(psmouse); 2013 return error; 2014 } 2015 2016 int elantech_init(struct psmouse *psmouse) 2017 { 2018 struct elantech_device_info info; 2019 int error = -EINVAL; 2020 2021 psmouse_reset(psmouse); 2022 2023 error = elantech_query_info(psmouse, &info); 2024 if (error) 2025 goto init_fail; 2026 2027 #if defined(CONFIG_MOUSE_PS2_ELANTECH_SMBUS) 2028 2029 if (elantech_use_host_notify(psmouse, &info)) { 2030 if (!IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) || 2031 !IS_ENABLED(CONFIG_MOUSE_PS2_ELANTECH_SMBUS)) { 2032 psmouse_warn(psmouse, 2033 "The touchpad can support a better bus than the too old PS/2 protocol. " 2034 "Make sure MOUSE_PS2_ELANTECH_SMBUS and MOUSE_ELAN_I2C_SMBUS are enabled to get a better touchpad experience.\n"); 2035 } 2036 error = elantech_setup_smbus(psmouse, &info, true); 2037 if (!error) 2038 return PSMOUSE_ELANTECH_SMBUS; 2039 } 2040 2041 #endif /* CONFIG_MOUSE_PS2_ELANTECH_SMBUS */ 2042 2043 error = elantech_setup_ps2(psmouse, &info); 2044 if (error < 0) { 2045 /* 2046 * Not using any flavor of Elantech support, so clean up 2047 * SMbus breadcrumbs, if any. 2048 */ 2049 psmouse_smbus_cleanup(psmouse); 2050 goto init_fail; 2051 } 2052 2053 return PSMOUSE_ELANTECH; 2054 init_fail: 2055 psmouse_reset(psmouse); 2056 return error; 2057 } 2058