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 NULL 1190 }; 1191 1192 /* 1193 * Set the appropriate event bits for the input subsystem 1194 */ 1195 static int elantech_set_input_params(struct psmouse *psmouse) 1196 { 1197 struct input_dev *dev = psmouse->dev; 1198 struct elantech_data *etd = psmouse->private; 1199 struct elantech_device_info *info = &etd->info; 1200 unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0; 1201 1202 if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width)) 1203 return -1; 1204 1205 __set_bit(INPUT_PROP_POINTER, dev->propbit); 1206 __set_bit(EV_KEY, dev->evbit); 1207 __set_bit(EV_ABS, dev->evbit); 1208 __clear_bit(EV_REL, dev->evbit); 1209 1210 __set_bit(BTN_LEFT, dev->keybit); 1211 if (dmi_check_system(elantech_dmi_has_middle_button) || 1212 psmouse_matches_pnp_id(psmouse, middle_button_pnp_ids)) 1213 __set_bit(BTN_MIDDLE, dev->keybit); 1214 __set_bit(BTN_RIGHT, dev->keybit); 1215 1216 __set_bit(BTN_TOUCH, dev->keybit); 1217 __set_bit(BTN_TOOL_FINGER, dev->keybit); 1218 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit); 1219 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit); 1220 1221 switch (info->hw_version) { 1222 case 1: 1223 /* Rocker button */ 1224 if (info->fw_version < 0x020000 && 1225 (info->capabilities[0] & ETP_CAP_HAS_ROCKER)) { 1226 __set_bit(BTN_FORWARD, dev->keybit); 1227 __set_bit(BTN_BACK, dev->keybit); 1228 } 1229 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0); 1230 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0); 1231 break; 1232 1233 case 2: 1234 __set_bit(BTN_TOOL_QUADTAP, dev->keybit); 1235 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit); 1236 /* fall through */ 1237 case 3: 1238 if (info->hw_version == 3) 1239 elantech_set_buttonpad_prop(psmouse); 1240 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0); 1241 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0); 1242 if (info->reports_pressure) { 1243 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2, 1244 ETP_PMAX_V2, 0, 0); 1245 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2, 1246 ETP_WMAX_V2, 0, 0); 1247 } 1248 input_mt_init_slots(dev, 2, INPUT_MT_SEMI_MT); 1249 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0); 1250 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0); 1251 break; 1252 1253 case 4: 1254 elantech_set_buttonpad_prop(psmouse); 1255 __set_bit(BTN_TOOL_QUADTAP, dev->keybit); 1256 /* For X to recognize me as touchpad. */ 1257 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0); 1258 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0); 1259 /* 1260 * range of pressure and width is the same as v2, 1261 * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility. 1262 */ 1263 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2, 1264 ETP_PMAX_V2, 0, 0); 1265 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2, 1266 ETP_WMAX_V2, 0, 0); 1267 /* Multitouch capable pad, up to 5 fingers. */ 1268 input_mt_init_slots(dev, ETP_MAX_FINGERS, 0); 1269 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0); 1270 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0); 1271 input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2, 1272 ETP_PMAX_V2, 0, 0); 1273 /* 1274 * The firmware reports how many trace lines the finger spans, 1275 * convert to surface unit as Protocol-B requires. 1276 */ 1277 input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0, 1278 ETP_WMAX_V2 * width, 0, 0); 1279 break; 1280 } 1281 1282 input_abs_set_res(dev, ABS_X, info->x_res); 1283 input_abs_set_res(dev, ABS_Y, info->y_res); 1284 if (info->hw_version > 1) { 1285 input_abs_set_res(dev, ABS_MT_POSITION_X, info->x_res); 1286 input_abs_set_res(dev, ABS_MT_POSITION_Y, info->y_res); 1287 } 1288 1289 etd->y_max = y_max; 1290 etd->width = width; 1291 1292 return 0; 1293 } 1294 1295 struct elantech_attr_data { 1296 size_t field_offset; 1297 unsigned char reg; 1298 }; 1299 1300 /* 1301 * Display a register value by reading a sysfs entry 1302 */ 1303 static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data, 1304 char *buf) 1305 { 1306 struct elantech_data *etd = psmouse->private; 1307 struct elantech_attr_data *attr = data; 1308 unsigned char *reg = (unsigned char *) etd + attr->field_offset; 1309 int rc = 0; 1310 1311 if (attr->reg) 1312 rc = elantech_read_reg(psmouse, attr->reg, reg); 1313 1314 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg); 1315 } 1316 1317 /* 1318 * Write a register value by writing a sysfs entry 1319 */ 1320 static ssize_t elantech_set_int_attr(struct psmouse *psmouse, 1321 void *data, const char *buf, size_t count) 1322 { 1323 struct elantech_data *etd = psmouse->private; 1324 struct elantech_attr_data *attr = data; 1325 unsigned char *reg = (unsigned char *) etd + attr->field_offset; 1326 unsigned char value; 1327 int err; 1328 1329 err = kstrtou8(buf, 16, &value); 1330 if (err) 1331 return err; 1332 1333 /* Do we need to preserve some bits for version 2 hardware too? */ 1334 if (etd->info.hw_version == 1) { 1335 if (attr->reg == 0x10) 1336 /* Force absolute mode always on */ 1337 value |= ETP_R10_ABSOLUTE_MODE; 1338 else if (attr->reg == 0x11) 1339 /* Force 4 byte mode always on */ 1340 value |= ETP_R11_4_BYTE_MODE; 1341 } 1342 1343 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0) 1344 *reg = value; 1345 1346 return count; 1347 } 1348 1349 #define ELANTECH_INT_ATTR(_name, _register) \ 1350 static struct elantech_attr_data elantech_attr_##_name = { \ 1351 .field_offset = offsetof(struct elantech_data, _name), \ 1352 .reg = _register, \ 1353 }; \ 1354 PSMOUSE_DEFINE_ATTR(_name, 0644, \ 1355 &elantech_attr_##_name, \ 1356 elantech_show_int_attr, \ 1357 elantech_set_int_attr) 1358 1359 #define ELANTECH_INFO_ATTR(_name) \ 1360 static struct elantech_attr_data elantech_attr_##_name = { \ 1361 .field_offset = offsetof(struct elantech_data, info) + \ 1362 offsetof(struct elantech_device_info, _name), \ 1363 .reg = 0, \ 1364 }; \ 1365 PSMOUSE_DEFINE_ATTR(_name, 0644, \ 1366 &elantech_attr_##_name, \ 1367 elantech_show_int_attr, \ 1368 elantech_set_int_attr) 1369 1370 ELANTECH_INT_ATTR(reg_07, 0x07); 1371 ELANTECH_INT_ATTR(reg_10, 0x10); 1372 ELANTECH_INT_ATTR(reg_11, 0x11); 1373 ELANTECH_INT_ATTR(reg_20, 0x20); 1374 ELANTECH_INT_ATTR(reg_21, 0x21); 1375 ELANTECH_INT_ATTR(reg_22, 0x22); 1376 ELANTECH_INT_ATTR(reg_23, 0x23); 1377 ELANTECH_INT_ATTR(reg_24, 0x24); 1378 ELANTECH_INT_ATTR(reg_25, 0x25); 1379 ELANTECH_INT_ATTR(reg_26, 0x26); 1380 ELANTECH_INFO_ATTR(debug); 1381 ELANTECH_INFO_ATTR(paritycheck); 1382 ELANTECH_INFO_ATTR(crc_enabled); 1383 1384 static struct attribute *elantech_attrs[] = { 1385 &psmouse_attr_reg_07.dattr.attr, 1386 &psmouse_attr_reg_10.dattr.attr, 1387 &psmouse_attr_reg_11.dattr.attr, 1388 &psmouse_attr_reg_20.dattr.attr, 1389 &psmouse_attr_reg_21.dattr.attr, 1390 &psmouse_attr_reg_22.dattr.attr, 1391 &psmouse_attr_reg_23.dattr.attr, 1392 &psmouse_attr_reg_24.dattr.attr, 1393 &psmouse_attr_reg_25.dattr.attr, 1394 &psmouse_attr_reg_26.dattr.attr, 1395 &psmouse_attr_debug.dattr.attr, 1396 &psmouse_attr_paritycheck.dattr.attr, 1397 &psmouse_attr_crc_enabled.dattr.attr, 1398 NULL 1399 }; 1400 1401 static const struct attribute_group elantech_attr_group = { 1402 .attrs = elantech_attrs, 1403 }; 1404 1405 static bool elantech_is_signature_valid(const unsigned char *param) 1406 { 1407 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 }; 1408 int i; 1409 1410 if (param[0] == 0) 1411 return false; 1412 1413 if (param[1] == 0) 1414 return true; 1415 1416 /* 1417 * Some hw_version >= 4 models have a revision higher then 20. Meaning 1418 * that param[2] may be 10 or 20, skip the rates check for these. 1419 */ 1420 if ((param[0] & 0x0f) >= 0x06 && (param[1] & 0xaf) == 0x0f && 1421 param[2] < 40) 1422 return true; 1423 1424 for (i = 0; i < ARRAY_SIZE(rates); i++) 1425 if (param[2] == rates[i]) 1426 return false; 1427 1428 return true; 1429 } 1430 1431 /* 1432 * Use magic knock to detect Elantech touchpad 1433 */ 1434 int elantech_detect(struct psmouse *psmouse, bool set_properties) 1435 { 1436 struct ps2dev *ps2dev = &psmouse->ps2dev; 1437 unsigned char param[3]; 1438 1439 ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS); 1440 1441 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) || 1442 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || 1443 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || 1444 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || 1445 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) { 1446 psmouse_dbg(psmouse, "sending Elantech magic knock failed.\n"); 1447 return -1; 1448 } 1449 1450 /* 1451 * Report this in case there are Elantech models that use a different 1452 * set of magic numbers 1453 */ 1454 if (param[0] != 0x3c || param[1] != 0x03 || 1455 (param[2] != 0xc8 && param[2] != 0x00)) { 1456 psmouse_dbg(psmouse, 1457 "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n", 1458 param[0], param[1], param[2]); 1459 return -1; 1460 } 1461 1462 /* 1463 * Query touchpad's firmware version and see if it reports known 1464 * value to avoid mis-detection. Logitech mice are known to respond 1465 * to Elantech magic knock and there might be more. 1466 */ 1467 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) { 1468 psmouse_dbg(psmouse, "failed to query firmware version.\n"); 1469 return -1; 1470 } 1471 1472 psmouse_dbg(psmouse, 1473 "Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n", 1474 param[0], param[1], param[2]); 1475 1476 if (!elantech_is_signature_valid(param)) { 1477 psmouse_dbg(psmouse, 1478 "Probably not a real Elantech touchpad. Aborting.\n"); 1479 return -1; 1480 } 1481 1482 if (set_properties) { 1483 psmouse->vendor = "Elantech"; 1484 psmouse->name = "Touchpad"; 1485 } 1486 1487 return 0; 1488 } 1489 1490 /* 1491 * Clean up sysfs entries when disconnecting 1492 */ 1493 static void elantech_disconnect(struct psmouse *psmouse) 1494 { 1495 struct elantech_data *etd = psmouse->private; 1496 1497 /* 1498 * We might have left a breadcrumb when trying to 1499 * set up SMbus companion. 1500 */ 1501 psmouse_smbus_cleanup(psmouse); 1502 1503 if (etd->tp_dev) 1504 input_unregister_device(etd->tp_dev); 1505 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, 1506 &elantech_attr_group); 1507 kfree(psmouse->private); 1508 psmouse->private = NULL; 1509 } 1510 1511 /* 1512 * Put the touchpad back into absolute mode when reconnecting 1513 */ 1514 static int elantech_reconnect(struct psmouse *psmouse) 1515 { 1516 psmouse_reset(psmouse); 1517 1518 if (elantech_detect(psmouse, 0)) 1519 return -1; 1520 1521 if (elantech_set_absolute_mode(psmouse)) { 1522 psmouse_err(psmouse, 1523 "failed to put touchpad back into absolute mode.\n"); 1524 return -1; 1525 } 1526 1527 return 0; 1528 } 1529 1530 /* 1531 * Some hw_version 4 models do not work with crc_disabled 1532 */ 1533 static const struct dmi_system_id elantech_dmi_force_crc_enabled[] = { 1534 #if defined(CONFIG_DMI) && defined(CONFIG_X86) 1535 { 1536 /* Fujitsu H730 does not work with crc_enabled == 0 */ 1537 .matches = { 1538 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1539 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"), 1540 }, 1541 }, 1542 { 1543 /* Fujitsu H760 does not work with crc_enabled == 0 */ 1544 .matches = { 1545 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1546 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H760"), 1547 }, 1548 }, 1549 { 1550 /* Fujitsu LIFEBOOK E544 does not work with crc_enabled == 0 */ 1551 .matches = { 1552 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1553 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E544"), 1554 }, 1555 }, 1556 { 1557 /* Fujitsu LIFEBOOK E546 does not work with crc_enabled == 0 */ 1558 .matches = { 1559 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1560 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E546"), 1561 }, 1562 }, 1563 { 1564 /* Fujitsu LIFEBOOK E547 does not work with crc_enabled == 0 */ 1565 .matches = { 1566 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1567 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E547"), 1568 }, 1569 }, 1570 { 1571 /* Fujitsu LIFEBOOK E554 does not work with crc_enabled == 0 */ 1572 .matches = { 1573 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1574 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E554"), 1575 }, 1576 }, 1577 { 1578 /* Fujitsu LIFEBOOK E556 does not work with crc_enabled == 0 */ 1579 .matches = { 1580 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1581 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E556"), 1582 }, 1583 }, 1584 { 1585 /* Fujitsu LIFEBOOK E557 does not work with crc_enabled == 0 */ 1586 .matches = { 1587 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1588 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E557"), 1589 }, 1590 }, 1591 { 1592 /* Fujitsu LIFEBOOK U745 does not work with crc_enabled == 0 */ 1593 .matches = { 1594 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1595 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK U745"), 1596 }, 1597 }, 1598 #endif 1599 { } 1600 }; 1601 1602 /* 1603 * Some hw_version 3 models go into error state when we try to set 1604 * bit 3 and/or bit 1 of r10. 1605 */ 1606 static const struct dmi_system_id no_hw_res_dmi_table[] = { 1607 #if defined(CONFIG_DMI) && defined(CONFIG_X86) 1608 { 1609 /* Gigabyte U2442 */ 1610 .matches = { 1611 DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"), 1612 DMI_MATCH(DMI_PRODUCT_NAME, "U2442"), 1613 }, 1614 }, 1615 #endif 1616 { } 1617 }; 1618 1619 /* 1620 * determine hardware version and set some properties according to it. 1621 */ 1622 static int elantech_set_properties(struct elantech_device_info *info) 1623 { 1624 /* This represents the version of IC body. */ 1625 int ver = (info->fw_version & 0x0f0000) >> 16; 1626 1627 /* Early version of Elan touchpads doesn't obey the rule. */ 1628 if (info->fw_version < 0x020030 || info->fw_version == 0x020600) 1629 info->hw_version = 1; 1630 else { 1631 switch (ver) { 1632 case 2: 1633 case 4: 1634 info->hw_version = 2; 1635 break; 1636 case 5: 1637 info->hw_version = 3; 1638 break; 1639 case 6 ... 15: 1640 info->hw_version = 4; 1641 break; 1642 default: 1643 return -1; 1644 } 1645 } 1646 1647 /* decide which send_cmd we're gonna use early */ 1648 info->send_cmd = info->hw_version >= 3 ? elantech_send_cmd : 1649 synaptics_send_cmd; 1650 1651 /* Turn on packet checking by default */ 1652 info->paritycheck = 1; 1653 1654 /* 1655 * This firmware suffers from misreporting coordinates when 1656 * a touch action starts causing the mouse cursor or scrolled page 1657 * to jump. Enable a workaround. 1658 */ 1659 info->jumpy_cursor = 1660 (info->fw_version == 0x020022 || info->fw_version == 0x020600); 1661 1662 if (info->hw_version > 1) { 1663 /* For now show extra debug information */ 1664 info->debug = 1; 1665 1666 if (info->fw_version >= 0x020800) 1667 info->reports_pressure = true; 1668 } 1669 1670 /* 1671 * The signatures of v3 and v4 packets change depending on the 1672 * value of this hardware flag. 1673 */ 1674 info->crc_enabled = (info->fw_version & 0x4000) == 0x4000 || 1675 dmi_check_system(elantech_dmi_force_crc_enabled); 1676 1677 /* Enable real hardware resolution on hw_version 3 ? */ 1678 info->set_hw_resolution = !dmi_check_system(no_hw_res_dmi_table); 1679 1680 return 0; 1681 } 1682 1683 static int elantech_query_info(struct psmouse *psmouse, 1684 struct elantech_device_info *info) 1685 { 1686 unsigned char param[3]; 1687 1688 memset(info, 0, sizeof(*info)); 1689 1690 /* 1691 * Do the version query again so we can store the result 1692 */ 1693 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) { 1694 psmouse_err(psmouse, "failed to query firmware version.\n"); 1695 return -EINVAL; 1696 } 1697 info->fw_version = (param[0] << 16) | (param[1] << 8) | param[2]; 1698 1699 if (elantech_set_properties(info)) { 1700 psmouse_err(psmouse, "unknown hardware version, aborting...\n"); 1701 return -EINVAL; 1702 } 1703 psmouse_info(psmouse, 1704 "assuming hardware version %d (with firmware version 0x%02x%02x%02x)\n", 1705 info->hw_version, param[0], param[1], param[2]); 1706 1707 if (info->send_cmd(psmouse, ETP_CAPABILITIES_QUERY, 1708 info->capabilities)) { 1709 psmouse_err(psmouse, "failed to query capabilities.\n"); 1710 return -EINVAL; 1711 } 1712 psmouse_info(psmouse, 1713 "Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n", 1714 info->capabilities[0], info->capabilities[1], 1715 info->capabilities[2]); 1716 1717 if (info->hw_version != 1) { 1718 if (info->send_cmd(psmouse, ETP_SAMPLE_QUERY, info->samples)) { 1719 psmouse_err(psmouse, "failed to query sample data\n"); 1720 return -EINVAL; 1721 } 1722 psmouse_info(psmouse, 1723 "Elan sample query result %02x, %02x, %02x\n", 1724 info->samples[0], 1725 info->samples[1], 1726 info->samples[2]); 1727 } 1728 1729 if (info->samples[1] == 0x74 && info->hw_version == 0x03) { 1730 /* 1731 * This module has a bug which makes absolute mode 1732 * unusable, so let's abort so we'll be using standard 1733 * PS/2 protocol. 1734 */ 1735 psmouse_info(psmouse, 1736 "absolute mode broken, forcing standard PS/2 protocol\n"); 1737 return -ENODEV; 1738 } 1739 1740 /* The MSB indicates the presence of the trackpoint */ 1741 info->has_trackpoint = (info->capabilities[0] & 0x80) == 0x80; 1742 1743 info->x_res = 31; 1744 info->y_res = 31; 1745 if (info->hw_version == 4) { 1746 if (elantech_get_resolution_v4(psmouse, 1747 &info->x_res, 1748 &info->y_res, 1749 &info->bus)) { 1750 psmouse_warn(psmouse, 1751 "failed to query resolution data.\n"); 1752 } 1753 } 1754 1755 return 0; 1756 } 1757 1758 #if defined(CONFIG_MOUSE_PS2_ELANTECH_SMBUS) 1759 1760 /* 1761 * The newest Elantech device can use a secondary bus (over SMBus) which 1762 * provides a better bandwidth and allow a better control of the touchpads. 1763 * This is used to decide if we need to use this bus or not. 1764 */ 1765 enum { 1766 ELANTECH_SMBUS_NOT_SET = -1, 1767 ELANTECH_SMBUS_OFF, 1768 ELANTECH_SMBUS_ON, 1769 }; 1770 1771 static int elantech_smbus = IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) ? 1772 ELANTECH_SMBUS_NOT_SET : ELANTECH_SMBUS_OFF; 1773 module_param_named(elantech_smbus, elantech_smbus, int, 0644); 1774 MODULE_PARM_DESC(elantech_smbus, "Use a secondary bus for the Elantech device."); 1775 1776 static const char * const i2c_blacklist_pnp_ids[] = { 1777 /* 1778 * These are known to not be working properly as bits are missing 1779 * in elan_i2c. 1780 */ 1781 "LEN2131", /* ThinkPad P52 w/ NFC */ 1782 "LEN2132", /* ThinkPad P52 */ 1783 "LEN2133", /* ThinkPad P72 w/ NFC */ 1784 "LEN2134", /* ThinkPad P72 */ 1785 NULL 1786 }; 1787 1788 static int elantech_create_smbus(struct psmouse *psmouse, 1789 struct elantech_device_info *info, 1790 bool leave_breadcrumbs) 1791 { 1792 const struct property_entry i2c_properties[] = { 1793 PROPERTY_ENTRY_BOOL("elan,trackpoint"), 1794 { }, 1795 }; 1796 struct i2c_board_info smbus_board = { 1797 I2C_BOARD_INFO("elan_i2c", 0x15), 1798 .flags = I2C_CLIENT_HOST_NOTIFY, 1799 }; 1800 1801 if (info->has_trackpoint) 1802 smbus_board.properties = i2c_properties; 1803 1804 return psmouse_smbus_init(psmouse, &smbus_board, NULL, 0, false, 1805 leave_breadcrumbs); 1806 } 1807 1808 /** 1809 * elantech_setup_smbus - called once the PS/2 devices are enumerated 1810 * and decides to instantiate a SMBus InterTouch device. 1811 */ 1812 static int elantech_setup_smbus(struct psmouse *psmouse, 1813 struct elantech_device_info *info, 1814 bool leave_breadcrumbs) 1815 { 1816 int error; 1817 1818 if (elantech_smbus == ELANTECH_SMBUS_OFF) 1819 return -ENXIO; 1820 1821 if (elantech_smbus == ELANTECH_SMBUS_NOT_SET) { 1822 /* 1823 * New ICs are enabled by default, unless mentioned in 1824 * i2c_blacklist_pnp_ids. 1825 * Old ICs are up to the user to decide. 1826 */ 1827 if (!ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version) || 1828 psmouse_matches_pnp_id(psmouse, i2c_blacklist_pnp_ids)) 1829 return -ENXIO; 1830 } 1831 1832 psmouse_info(psmouse, "Trying to set up SMBus access\n"); 1833 1834 error = elantech_create_smbus(psmouse, info, leave_breadcrumbs); 1835 if (error) { 1836 if (error == -EAGAIN) 1837 psmouse_info(psmouse, "SMbus companion is not ready yet\n"); 1838 else 1839 psmouse_err(psmouse, "unable to create intertouch device\n"); 1840 1841 return error; 1842 } 1843 1844 return 0; 1845 } 1846 1847 static bool elantech_use_host_notify(struct psmouse *psmouse, 1848 struct elantech_device_info *info) 1849 { 1850 if (ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version)) 1851 return true; 1852 1853 switch (info->bus) { 1854 case ETP_BUS_PS2_ONLY: 1855 /* expected case */ 1856 break; 1857 case ETP_BUS_SMB_ALERT_ONLY: 1858 /* fall-through */ 1859 case ETP_BUS_PS2_SMB_ALERT: 1860 psmouse_dbg(psmouse, "Ignoring SMBus provider through alert protocol.\n"); 1861 break; 1862 case ETP_BUS_SMB_HST_NTFY_ONLY: 1863 /* fall-through */ 1864 case ETP_BUS_PS2_SMB_HST_NTFY: 1865 return true; 1866 default: 1867 psmouse_dbg(psmouse, 1868 "Ignoring SMBus bus provider %d.\n", 1869 info->bus); 1870 } 1871 1872 return false; 1873 } 1874 1875 int elantech_init_smbus(struct psmouse *psmouse) 1876 { 1877 struct elantech_device_info info; 1878 int error = -EINVAL; 1879 1880 psmouse_reset(psmouse); 1881 1882 error = elantech_query_info(psmouse, &info); 1883 if (error) 1884 goto init_fail; 1885 1886 if (info.hw_version < 4) { 1887 error = -ENXIO; 1888 goto init_fail; 1889 } 1890 1891 return elantech_create_smbus(psmouse, &info, false); 1892 init_fail: 1893 psmouse_reset(psmouse); 1894 return error; 1895 } 1896 #endif /* CONFIG_MOUSE_PS2_ELANTECH_SMBUS */ 1897 1898 /* 1899 * Initialize the touchpad and create sysfs entries 1900 */ 1901 static int elantech_setup_ps2(struct psmouse *psmouse, 1902 struct elantech_device_info *info) 1903 { 1904 struct elantech_data *etd; 1905 int i; 1906 int error = -EINVAL; 1907 struct input_dev *tp_dev; 1908 1909 psmouse->private = etd = kzalloc(sizeof(*etd), GFP_KERNEL); 1910 if (!etd) 1911 return -ENOMEM; 1912 1913 etd->info = *info; 1914 1915 etd->parity[0] = 1; 1916 for (i = 1; i < 256; i++) 1917 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1; 1918 1919 if (elantech_set_absolute_mode(psmouse)) { 1920 psmouse_err(psmouse, 1921 "failed to put touchpad into absolute mode.\n"); 1922 goto init_fail; 1923 } 1924 1925 if (info->fw_version == 0x381f17) { 1926 etd->original_set_rate = psmouse->set_rate; 1927 psmouse->set_rate = elantech_set_rate_restore_reg_07; 1928 } 1929 1930 if (elantech_set_input_params(psmouse)) { 1931 psmouse_err(psmouse, "failed to query touchpad range.\n"); 1932 goto init_fail; 1933 } 1934 1935 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj, 1936 &elantech_attr_group); 1937 if (error) { 1938 psmouse_err(psmouse, 1939 "failed to create sysfs attributes, error: %d.\n", 1940 error); 1941 goto init_fail; 1942 } 1943 1944 if (info->has_trackpoint) { 1945 tp_dev = input_allocate_device(); 1946 1947 if (!tp_dev) { 1948 error = -ENOMEM; 1949 goto init_fail_tp_alloc; 1950 } 1951 1952 etd->tp_dev = tp_dev; 1953 snprintf(etd->tp_phys, sizeof(etd->tp_phys), "%s/input1", 1954 psmouse->ps2dev.serio->phys); 1955 tp_dev->phys = etd->tp_phys; 1956 tp_dev->name = "ETPS/2 Elantech TrackPoint"; 1957 tp_dev->id.bustype = BUS_I8042; 1958 tp_dev->id.vendor = 0x0002; 1959 tp_dev->id.product = PSMOUSE_ELANTECH; 1960 tp_dev->id.version = 0x0000; 1961 tp_dev->dev.parent = &psmouse->ps2dev.serio->dev; 1962 tp_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); 1963 tp_dev->relbit[BIT_WORD(REL_X)] = 1964 BIT_MASK(REL_X) | BIT_MASK(REL_Y); 1965 tp_dev->keybit[BIT_WORD(BTN_LEFT)] = 1966 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | 1967 BIT_MASK(BTN_RIGHT); 1968 1969 __set_bit(INPUT_PROP_POINTER, tp_dev->propbit); 1970 __set_bit(INPUT_PROP_POINTING_STICK, tp_dev->propbit); 1971 1972 error = input_register_device(etd->tp_dev); 1973 if (error < 0) 1974 goto init_fail_tp_reg; 1975 } 1976 1977 psmouse->protocol_handler = elantech_process_byte; 1978 psmouse->disconnect = elantech_disconnect; 1979 psmouse->reconnect = elantech_reconnect; 1980 psmouse->pktsize = info->hw_version > 1 ? 6 : 4; 1981 1982 return 0; 1983 init_fail_tp_reg: 1984 input_free_device(tp_dev); 1985 init_fail_tp_alloc: 1986 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, 1987 &elantech_attr_group); 1988 init_fail: 1989 kfree(etd); 1990 return error; 1991 } 1992 1993 int elantech_init_ps2(struct psmouse *psmouse) 1994 { 1995 struct elantech_device_info info; 1996 int error = -EINVAL; 1997 1998 psmouse_reset(psmouse); 1999 2000 error = elantech_query_info(psmouse, &info); 2001 if (error) 2002 goto init_fail; 2003 2004 error = elantech_setup_ps2(psmouse, &info); 2005 if (error) 2006 goto init_fail; 2007 2008 return 0; 2009 init_fail: 2010 psmouse_reset(psmouse); 2011 return error; 2012 } 2013 2014 int elantech_init(struct psmouse *psmouse) 2015 { 2016 struct elantech_device_info info; 2017 int error = -EINVAL; 2018 2019 psmouse_reset(psmouse); 2020 2021 error = elantech_query_info(psmouse, &info); 2022 if (error) 2023 goto init_fail; 2024 2025 #if defined(CONFIG_MOUSE_PS2_ELANTECH_SMBUS) 2026 2027 if (elantech_use_host_notify(psmouse, &info)) { 2028 if (!IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) || 2029 !IS_ENABLED(CONFIG_MOUSE_PS2_ELANTECH_SMBUS)) { 2030 psmouse_warn(psmouse, 2031 "The touchpad can support a better bus than the too old PS/2 protocol. " 2032 "Make sure MOUSE_PS2_ELANTECH_SMBUS and MOUSE_ELAN_I2C_SMBUS are enabled to get a better touchpad experience.\n"); 2033 } 2034 error = elantech_setup_smbus(psmouse, &info, true); 2035 if (!error) 2036 return PSMOUSE_ELANTECH_SMBUS; 2037 } 2038 2039 #endif /* CONFIG_MOUSE_PS2_ELANTECH_SMBUS */ 2040 2041 error = elantech_setup_ps2(psmouse, &info); 2042 if (error < 0) { 2043 /* 2044 * Not using any flavor of Elantech support, so clean up 2045 * SMbus breadcrumbs, if any. 2046 */ 2047 psmouse_smbus_cleanup(psmouse); 2048 goto init_fail; 2049 } 2050 2051 return PSMOUSE_ELANTECH; 2052 init_fail: 2053 psmouse_reset(psmouse); 2054 return error; 2055 } 2056