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 * Advertise INPUT_PROP_BUTTONPAD for clickpads. The testing of bit 12 in 231 * fw_version for this is based on the following fw_version & caps table: 232 * 233 * Laptop-model: fw_version: caps: buttons: 234 * Acer S3 0x461f00 10, 13, 0e clickpad 235 * Acer S7-392 0x581f01 50, 17, 0d clickpad 236 * Acer V5-131 0x461f02 01, 16, 0c clickpad 237 * Acer V5-551 0x461f00 ? clickpad 238 * Asus K53SV 0x450f01 78, 15, 0c 2 hw buttons 239 * Asus G46VW 0x460f02 00, 18, 0c 2 hw buttons 240 * Asus G750JX 0x360f00 00, 16, 0c 2 hw buttons 241 * Asus TP500LN 0x381f17 10, 14, 0e clickpad 242 * Asus X750JN 0x381f17 10, 14, 0e clickpad 243 * Asus UX31 0x361f00 20, 15, 0e clickpad 244 * Asus UX32VD 0x361f02 00, 15, 0e clickpad 245 * Avatar AVIU-145A2 0x361f00 ? clickpad 246 * Fujitsu CELSIUS H760 0x570f02 40, 14, 0c 3 hw buttons (**) 247 * Fujitsu CELSIUS H780 0x5d0f02 41, 16, 0d 3 hw buttons (**) 248 * Fujitsu LIFEBOOK E544 0x470f00 d0, 12, 09 2 hw buttons 249 * Fujitsu LIFEBOOK E546 0x470f00 50, 12, 09 2 hw buttons 250 * Fujitsu LIFEBOOK E547 0x470f00 50, 12, 09 2 hw buttons 251 * Fujitsu LIFEBOOK E554 0x570f01 40, 14, 0c 2 hw buttons 252 * Fujitsu LIFEBOOK E557 0x570f01 40, 14, 0c 2 hw buttons 253 * Fujitsu T725 0x470f01 05, 12, 09 2 hw buttons 254 * Fujitsu H730 0x570f00 c0, 14, 0c 3 hw buttons (**) 255 * Gigabyte U2442 0x450f01 58, 17, 0c 2 hw buttons 256 * Lenovo L430 0x350f02 b9, 15, 0c 2 hw buttons (*) 257 * Lenovo L530 0x350f02 b9, 15, 0c 2 hw buttons (*) 258 * Samsung NF210 0x150b00 78, 14, 0a 2 hw buttons 259 * Samsung NP770Z5E 0x575f01 10, 15, 0f clickpad 260 * Samsung NP700Z5B 0x361f06 21, 15, 0f clickpad 261 * Samsung NP900X3E-A02 0x575f03 ? clickpad 262 * Samsung NP-QX410 0x851b00 19, 14, 0c clickpad 263 * Samsung RC512 0x450f00 08, 15, 0c 2 hw buttons 264 * Samsung RF710 0x450f00 ? 2 hw buttons 265 * System76 Pangolin 0x250f01 ? 2 hw buttons 266 * (*) + 3 trackpoint buttons 267 * (**) + 0 trackpoint buttons 268 * Note: Lenovo L430 and Lenovo L530 have the same fw_version/caps 269 */ 270 static inline int elantech_is_buttonpad(struct elantech_device_info *info) 271 { 272 return info->fw_version & 0x001000; 273 } 274 275 /* 276 * Interpret complete data packets and report absolute mode input events for 277 * hardware version 1. (4 byte packets) 278 */ 279 static void elantech_report_absolute_v1(struct psmouse *psmouse) 280 { 281 struct input_dev *dev = psmouse->dev; 282 struct elantech_data *etd = psmouse->private; 283 unsigned char *packet = psmouse->packet; 284 int fingers; 285 286 if (etd->info.fw_version < 0x020000) { 287 /* 288 * byte 0: D U p1 p2 1 p3 R L 289 * byte 1: f 0 th tw x9 x8 y9 y8 290 */ 291 fingers = ((packet[1] & 0x80) >> 7) + 292 ((packet[1] & 0x30) >> 4); 293 } else { 294 /* 295 * byte 0: n1 n0 p2 p1 1 p3 R L 296 * byte 1: 0 0 0 0 x9 x8 y9 y8 297 */ 298 fingers = (packet[0] & 0xc0) >> 6; 299 } 300 301 if (etd->info.jumpy_cursor) { 302 if (fingers != 1) { 303 etd->single_finger_reports = 0; 304 } else if (etd->single_finger_reports < 2) { 305 /* Discard first 2 reports of one finger, bogus */ 306 etd->single_finger_reports++; 307 elantech_debug("discarding packet\n"); 308 return; 309 } 310 } 311 312 input_report_key(dev, BTN_TOUCH, fingers != 0); 313 314 /* 315 * byte 2: x7 x6 x5 x4 x3 x2 x1 x0 316 * byte 3: y7 y6 y5 y4 y3 y2 y1 y0 317 */ 318 if (fingers) { 319 input_report_abs(dev, ABS_X, 320 ((packet[1] & 0x0c) << 6) | packet[2]); 321 input_report_abs(dev, ABS_Y, 322 etd->y_max - (((packet[1] & 0x03) << 8) | packet[3])); 323 } 324 325 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1); 326 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2); 327 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3); 328 329 psmouse_report_standard_buttons(dev, packet[0]); 330 331 if (etd->info.fw_version < 0x020000 && 332 (etd->info.capabilities[0] & ETP_CAP_HAS_ROCKER)) { 333 /* rocker up */ 334 input_report_key(dev, BTN_FORWARD, packet[0] & 0x40); 335 /* rocker down */ 336 input_report_key(dev, BTN_BACK, packet[0] & 0x80); 337 } 338 339 input_sync(dev); 340 } 341 342 static void elantech_set_slot(struct input_dev *dev, int slot, bool active, 343 unsigned int x, unsigned int y) 344 { 345 input_mt_slot(dev, slot); 346 input_mt_report_slot_state(dev, MT_TOOL_FINGER, active); 347 if (active) { 348 input_report_abs(dev, ABS_MT_POSITION_X, x); 349 input_report_abs(dev, ABS_MT_POSITION_Y, y); 350 } 351 } 352 353 /* x1 < x2 and y1 < y2 when two fingers, x = y = 0 when not pressed */ 354 static void elantech_report_semi_mt_data(struct input_dev *dev, 355 unsigned int num_fingers, 356 unsigned int x1, unsigned int y1, 357 unsigned int x2, unsigned int y2) 358 { 359 elantech_set_slot(dev, 0, num_fingers != 0, x1, y1); 360 elantech_set_slot(dev, 1, num_fingers >= 2, x2, y2); 361 } 362 363 /* 364 * Interpret complete data packets and report absolute mode input events for 365 * hardware version 2. (6 byte packets) 366 */ 367 static void elantech_report_absolute_v2(struct psmouse *psmouse) 368 { 369 struct elantech_data *etd = psmouse->private; 370 struct input_dev *dev = psmouse->dev; 371 unsigned char *packet = psmouse->packet; 372 unsigned int fingers, x1 = 0, y1 = 0, x2 = 0, y2 = 0; 373 unsigned int width = 0, pres = 0; 374 375 /* byte 0: n1 n0 . . . . R L */ 376 fingers = (packet[0] & 0xc0) >> 6; 377 378 switch (fingers) { 379 case 3: 380 /* 381 * Same as one finger, except report of more than 3 fingers: 382 * byte 3: n4 . w1 w0 . . . . 383 */ 384 if (packet[3] & 0x80) 385 fingers = 4; 386 /* fall through */ 387 case 1: 388 /* 389 * byte 1: . . . . x11 x10 x9 x8 390 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0 391 */ 392 x1 = ((packet[1] & 0x0f) << 8) | packet[2]; 393 /* 394 * byte 4: . . . . y11 y10 y9 y8 395 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0 396 */ 397 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]); 398 399 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4); 400 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4); 401 break; 402 403 case 2: 404 /* 405 * The coordinate of each finger is reported separately 406 * with a lower resolution for two finger touches: 407 * byte 0: . . ay8 ax8 . . . . 408 * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0 409 */ 410 x1 = (((packet[0] & 0x10) << 4) | packet[1]) << 2; 411 /* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */ 412 y1 = etd->y_max - 413 ((((packet[0] & 0x20) << 3) | packet[2]) << 2); 414 /* 415 * byte 3: . . by8 bx8 . . . . 416 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0 417 */ 418 x2 = (((packet[3] & 0x10) << 4) | packet[4]) << 2; 419 /* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */ 420 y2 = etd->y_max - 421 ((((packet[3] & 0x20) << 3) | packet[5]) << 2); 422 423 /* Unknown so just report sensible values */ 424 pres = 127; 425 width = 7; 426 break; 427 } 428 429 input_report_key(dev, BTN_TOUCH, fingers != 0); 430 if (fingers != 0) { 431 input_report_abs(dev, ABS_X, x1); 432 input_report_abs(dev, ABS_Y, y1); 433 } 434 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2); 435 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1); 436 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2); 437 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3); 438 input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4); 439 psmouse_report_standard_buttons(dev, packet[0]); 440 if (etd->info.reports_pressure) { 441 input_report_abs(dev, ABS_PRESSURE, pres); 442 input_report_abs(dev, ABS_TOOL_WIDTH, width); 443 } 444 445 input_sync(dev); 446 } 447 448 static void elantech_report_trackpoint(struct psmouse *psmouse, 449 int packet_type) 450 { 451 /* 452 * byte 0: 0 0 sx sy 0 M R L 453 * byte 1:~sx 0 0 0 0 0 0 0 454 * byte 2:~sy 0 0 0 0 0 0 0 455 * byte 3: 0 0 ~sy ~sx 0 1 1 0 456 * byte 4: x7 x6 x5 x4 x3 x2 x1 x0 457 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0 458 * 459 * x and y are written in two's complement spread 460 * over 9 bits with sx/sy the relative top bit and 461 * x7..x0 and y7..y0 the lower bits. 462 * The sign of y is opposite to what the input driver 463 * expects for a relative movement 464 */ 465 466 struct elantech_data *etd = psmouse->private; 467 struct input_dev *tp_dev = etd->tp_dev; 468 unsigned char *packet = psmouse->packet; 469 int x, y; 470 u32 t; 471 472 t = get_unaligned_le32(&packet[0]); 473 474 switch (t & ~7U) { 475 case 0x06000030U: 476 case 0x16008020U: 477 case 0x26800010U: 478 case 0x36808000U: 479 x = packet[4] - (int)((packet[1]^0x80) << 1); 480 y = (int)((packet[2]^0x80) << 1) - packet[5]; 481 482 psmouse_report_standard_buttons(tp_dev, packet[0]); 483 484 input_report_rel(tp_dev, REL_X, x); 485 input_report_rel(tp_dev, REL_Y, y); 486 487 input_sync(tp_dev); 488 489 break; 490 491 default: 492 /* Dump unexpected packet sequences if debug=1 (default) */ 493 if (etd->info.debug == 1) 494 elantech_packet_dump(psmouse); 495 496 break; 497 } 498 } 499 500 /* 501 * Interpret complete data packets and report absolute mode input events for 502 * hardware version 3. (12 byte packets for two fingers) 503 */ 504 static void elantech_report_absolute_v3(struct psmouse *psmouse, 505 int packet_type) 506 { 507 struct input_dev *dev = psmouse->dev; 508 struct elantech_data *etd = psmouse->private; 509 unsigned char *packet = psmouse->packet; 510 unsigned int fingers = 0, x1 = 0, y1 = 0, x2 = 0, y2 = 0; 511 unsigned int width = 0, pres = 0; 512 513 /* byte 0: n1 n0 . . . . R L */ 514 fingers = (packet[0] & 0xc0) >> 6; 515 516 switch (fingers) { 517 case 3: 518 case 1: 519 /* 520 * byte 1: . . . . x11 x10 x9 x8 521 * byte 2: x7 x6 x5 x4 x4 x2 x1 x0 522 */ 523 x1 = ((packet[1] & 0x0f) << 8) | packet[2]; 524 /* 525 * byte 4: . . . . y11 y10 y9 y8 526 * byte 5: y7 y6 y5 y4 y3 y2 y1 y0 527 */ 528 y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]); 529 break; 530 531 case 2: 532 if (packet_type == PACKET_V3_HEAD) { 533 /* 534 * byte 1: . . . . ax11 ax10 ax9 ax8 535 * byte 2: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0 536 */ 537 etd->mt[0].x = ((packet[1] & 0x0f) << 8) | packet[2]; 538 /* 539 * byte 4: . . . . ay11 ay10 ay9 ay8 540 * byte 5: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 541 */ 542 etd->mt[0].y = etd->y_max - 543 (((packet[4] & 0x0f) << 8) | packet[5]); 544 /* 545 * wait for next packet 546 */ 547 return; 548 } 549 550 /* packet_type == PACKET_V3_TAIL */ 551 x1 = etd->mt[0].x; 552 y1 = etd->mt[0].y; 553 x2 = ((packet[1] & 0x0f) << 8) | packet[2]; 554 y2 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]); 555 break; 556 } 557 558 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4); 559 width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4); 560 561 input_report_key(dev, BTN_TOUCH, fingers != 0); 562 if (fingers != 0) { 563 input_report_abs(dev, ABS_X, x1); 564 input_report_abs(dev, ABS_Y, y1); 565 } 566 elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2); 567 input_report_key(dev, BTN_TOOL_FINGER, fingers == 1); 568 input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2); 569 input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3); 570 571 /* For clickpads map both buttons to BTN_LEFT */ 572 if (elantech_is_buttonpad(&etd->info)) 573 input_report_key(dev, BTN_LEFT, packet[0] & 0x03); 574 else 575 psmouse_report_standard_buttons(dev, packet[0]); 576 577 input_report_abs(dev, ABS_PRESSURE, pres); 578 input_report_abs(dev, ABS_TOOL_WIDTH, width); 579 580 input_sync(dev); 581 } 582 583 static void elantech_input_sync_v4(struct psmouse *psmouse) 584 { 585 struct input_dev *dev = psmouse->dev; 586 struct elantech_data *etd = psmouse->private; 587 unsigned char *packet = psmouse->packet; 588 589 /* For clickpads map both buttons to BTN_LEFT */ 590 if (elantech_is_buttonpad(&etd->info)) 591 input_report_key(dev, BTN_LEFT, packet[0] & 0x03); 592 else 593 psmouse_report_standard_buttons(dev, packet[0]); 594 595 input_mt_report_pointer_emulation(dev, true); 596 input_sync(dev); 597 } 598 599 static void process_packet_status_v4(struct psmouse *psmouse) 600 { 601 struct input_dev *dev = psmouse->dev; 602 unsigned char *packet = psmouse->packet; 603 unsigned fingers; 604 int i; 605 606 /* notify finger state change */ 607 fingers = packet[1] & 0x1f; 608 for (i = 0; i < ETP_MAX_FINGERS; i++) { 609 if ((fingers & (1 << i)) == 0) { 610 input_mt_slot(dev, i); 611 input_mt_report_slot_state(dev, MT_TOOL_FINGER, false); 612 } 613 } 614 615 elantech_input_sync_v4(psmouse); 616 } 617 618 static void process_packet_head_v4(struct psmouse *psmouse) 619 { 620 struct input_dev *dev = psmouse->dev; 621 struct elantech_data *etd = psmouse->private; 622 unsigned char *packet = psmouse->packet; 623 int id = ((packet[3] & 0xe0) >> 5) - 1; 624 int pres, traces; 625 626 if (id < 0) 627 return; 628 629 etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2]; 630 etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]); 631 pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4); 632 traces = (packet[0] & 0xf0) >> 4; 633 634 input_mt_slot(dev, id); 635 input_mt_report_slot_state(dev, MT_TOOL_FINGER, true); 636 637 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x); 638 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y); 639 input_report_abs(dev, ABS_MT_PRESSURE, pres); 640 input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->width); 641 /* report this for backwards compatibility */ 642 input_report_abs(dev, ABS_TOOL_WIDTH, traces); 643 644 elantech_input_sync_v4(psmouse); 645 } 646 647 static void process_packet_motion_v4(struct psmouse *psmouse) 648 { 649 struct input_dev *dev = psmouse->dev; 650 struct elantech_data *etd = psmouse->private; 651 unsigned char *packet = psmouse->packet; 652 int weight, delta_x1 = 0, delta_y1 = 0, delta_x2 = 0, delta_y2 = 0; 653 int id, sid; 654 655 id = ((packet[0] & 0xe0) >> 5) - 1; 656 if (id < 0) 657 return; 658 659 sid = ((packet[3] & 0xe0) >> 5) - 1; 660 weight = (packet[0] & 0x10) ? ETP_WEIGHT_VALUE : 1; 661 /* 662 * Motion packets give us the delta of x, y values of specific fingers, 663 * but in two's complement. Let the compiler do the conversion for us. 664 * Also _enlarge_ the numbers to int, in case of overflow. 665 */ 666 delta_x1 = (signed char)packet[1]; 667 delta_y1 = (signed char)packet[2]; 668 delta_x2 = (signed char)packet[4]; 669 delta_y2 = (signed char)packet[5]; 670 671 etd->mt[id].x += delta_x1 * weight; 672 etd->mt[id].y -= delta_y1 * weight; 673 input_mt_slot(dev, id); 674 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x); 675 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y); 676 677 if (sid >= 0) { 678 etd->mt[sid].x += delta_x2 * weight; 679 etd->mt[sid].y -= delta_y2 * weight; 680 input_mt_slot(dev, sid); 681 input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[sid].x); 682 input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[sid].y); 683 } 684 685 elantech_input_sync_v4(psmouse); 686 } 687 688 static void elantech_report_absolute_v4(struct psmouse *psmouse, 689 int packet_type) 690 { 691 switch (packet_type) { 692 case PACKET_V4_STATUS: 693 process_packet_status_v4(psmouse); 694 break; 695 696 case PACKET_V4_HEAD: 697 process_packet_head_v4(psmouse); 698 break; 699 700 case PACKET_V4_MOTION: 701 process_packet_motion_v4(psmouse); 702 break; 703 704 case PACKET_UNKNOWN: 705 default: 706 /* impossible to get here */ 707 break; 708 } 709 } 710 711 static int elantech_packet_check_v1(struct psmouse *psmouse) 712 { 713 struct elantech_data *etd = psmouse->private; 714 unsigned char *packet = psmouse->packet; 715 unsigned char p1, p2, p3; 716 717 /* Parity bits are placed differently */ 718 if (etd->info.fw_version < 0x020000) { 719 /* byte 0: D U p1 p2 1 p3 R L */ 720 p1 = (packet[0] & 0x20) >> 5; 721 p2 = (packet[0] & 0x10) >> 4; 722 } else { 723 /* byte 0: n1 n0 p2 p1 1 p3 R L */ 724 p1 = (packet[0] & 0x10) >> 4; 725 p2 = (packet[0] & 0x20) >> 5; 726 } 727 728 p3 = (packet[0] & 0x04) >> 2; 729 730 return etd->parity[packet[1]] == p1 && 731 etd->parity[packet[2]] == p2 && 732 etd->parity[packet[3]] == p3; 733 } 734 735 static int elantech_debounce_check_v2(struct psmouse *psmouse) 736 { 737 /* 738 * When we encounter packet that matches this exactly, it means the 739 * hardware is in debounce status. Just ignore the whole packet. 740 */ 741 static const u8 debounce_packet[] = { 742 0x84, 0xff, 0xff, 0x02, 0xff, 0xff 743 }; 744 unsigned char *packet = psmouse->packet; 745 746 return !memcmp(packet, debounce_packet, sizeof(debounce_packet)); 747 } 748 749 static int elantech_packet_check_v2(struct psmouse *psmouse) 750 { 751 struct elantech_data *etd = psmouse->private; 752 unsigned char *packet = psmouse->packet; 753 754 /* 755 * V2 hardware has two flavors. Older ones that do not report pressure, 756 * and newer ones that reports pressure and width. With newer ones, all 757 * packets (1, 2, 3 finger touch) have the same constant bits. With 758 * older ones, 1/3 finger touch packets and 2 finger touch packets 759 * have different constant bits. 760 * With all three cases, if the constant bits are not exactly what I 761 * expected, I consider them invalid. 762 */ 763 if (etd->info.reports_pressure) 764 return (packet[0] & 0x0c) == 0x04 && 765 (packet[3] & 0x0f) == 0x02; 766 767 if ((packet[0] & 0xc0) == 0x80) 768 return (packet[0] & 0x0c) == 0x0c && 769 (packet[3] & 0x0e) == 0x08; 770 771 return (packet[0] & 0x3c) == 0x3c && 772 (packet[1] & 0xf0) == 0x00 && 773 (packet[3] & 0x3e) == 0x38 && 774 (packet[4] & 0xf0) == 0x00; 775 } 776 777 /* 778 * We check the constant bits to determine what packet type we get, 779 * so packet checking is mandatory for v3 and later hardware. 780 */ 781 static int elantech_packet_check_v3(struct psmouse *psmouse) 782 { 783 struct elantech_data *etd = psmouse->private; 784 static const u8 debounce_packet[] = { 785 0xc4, 0xff, 0xff, 0x02, 0xff, 0xff 786 }; 787 unsigned char *packet = psmouse->packet; 788 789 /* 790 * check debounce first, it has the same signature in byte 0 791 * and byte 3 as PACKET_V3_HEAD. 792 */ 793 if (!memcmp(packet, debounce_packet, sizeof(debounce_packet))) 794 return PACKET_DEBOUNCE; 795 796 /* 797 * If the hardware flag 'crc_enabled' is set the packets have 798 * different signatures. 799 */ 800 if (etd->info.crc_enabled) { 801 if ((packet[3] & 0x09) == 0x08) 802 return PACKET_V3_HEAD; 803 804 if ((packet[3] & 0x09) == 0x09) 805 return PACKET_V3_TAIL; 806 } else { 807 if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0xcf) == 0x02) 808 return PACKET_V3_HEAD; 809 810 if ((packet[0] & 0x0c) == 0x0c && (packet[3] & 0xce) == 0x0c) 811 return PACKET_V3_TAIL; 812 if ((packet[3] & 0x0f) == 0x06) 813 return PACKET_TRACKPOINT; 814 } 815 816 return PACKET_UNKNOWN; 817 } 818 819 static int elantech_packet_check_v4(struct psmouse *psmouse) 820 { 821 struct elantech_data *etd = psmouse->private; 822 unsigned char *packet = psmouse->packet; 823 unsigned char packet_type = packet[3] & 0x03; 824 unsigned int ic_version; 825 bool sanity_check; 826 827 if (etd->tp_dev && (packet[3] & 0x0f) == 0x06) 828 return PACKET_TRACKPOINT; 829 830 /* This represents the version of IC body. */ 831 ic_version = (etd->info.fw_version & 0x0f0000) >> 16; 832 833 /* 834 * Sanity check based on the constant bits of a packet. 835 * The constant bits change depending on the value of 836 * the hardware flag 'crc_enabled' and the version of 837 * the IC body, but are the same for every packet, 838 * regardless of the type. 839 */ 840 if (etd->info.crc_enabled) 841 sanity_check = ((packet[3] & 0x08) == 0x00); 842 else if (ic_version == 7 && etd->info.samples[1] == 0x2A) 843 sanity_check = ((packet[3] & 0x1c) == 0x10); 844 else 845 sanity_check = ((packet[0] & 0x08) == 0x00 && 846 (packet[3] & 0x1c) == 0x10); 847 848 if (!sanity_check) 849 return PACKET_UNKNOWN; 850 851 switch (packet_type) { 852 case 0: 853 return PACKET_V4_STATUS; 854 855 case 1: 856 return PACKET_V4_HEAD; 857 858 case 2: 859 return PACKET_V4_MOTION; 860 } 861 862 return PACKET_UNKNOWN; 863 } 864 865 /* 866 * Process byte stream from mouse and handle complete packets 867 */ 868 static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse) 869 { 870 struct elantech_data *etd = psmouse->private; 871 int packet_type; 872 873 if (psmouse->pktcnt < psmouse->pktsize) 874 return PSMOUSE_GOOD_DATA; 875 876 if (etd->info.debug > 1) 877 elantech_packet_dump(psmouse); 878 879 switch (etd->info.hw_version) { 880 case 1: 881 if (etd->info.paritycheck && !elantech_packet_check_v1(psmouse)) 882 return PSMOUSE_BAD_DATA; 883 884 elantech_report_absolute_v1(psmouse); 885 break; 886 887 case 2: 888 /* ignore debounce */ 889 if (elantech_debounce_check_v2(psmouse)) 890 return PSMOUSE_FULL_PACKET; 891 892 if (etd->info.paritycheck && !elantech_packet_check_v2(psmouse)) 893 return PSMOUSE_BAD_DATA; 894 895 elantech_report_absolute_v2(psmouse); 896 break; 897 898 case 3: 899 packet_type = elantech_packet_check_v3(psmouse); 900 switch (packet_type) { 901 case PACKET_UNKNOWN: 902 return PSMOUSE_BAD_DATA; 903 904 case PACKET_DEBOUNCE: 905 /* ignore debounce */ 906 break; 907 908 case PACKET_TRACKPOINT: 909 elantech_report_trackpoint(psmouse, packet_type); 910 break; 911 912 default: 913 elantech_report_absolute_v3(psmouse, packet_type); 914 break; 915 } 916 917 break; 918 919 case 4: 920 packet_type = elantech_packet_check_v4(psmouse); 921 switch (packet_type) { 922 case PACKET_UNKNOWN: 923 return PSMOUSE_BAD_DATA; 924 925 case PACKET_TRACKPOINT: 926 elantech_report_trackpoint(psmouse, packet_type); 927 break; 928 929 default: 930 elantech_report_absolute_v4(psmouse, packet_type); 931 break; 932 } 933 934 break; 935 } 936 937 return PSMOUSE_FULL_PACKET; 938 } 939 940 /* 941 * This writes the reg_07 value again to the hardware at the end of every 942 * set_rate call because the register loses its value. reg_07 allows setting 943 * absolute mode on v4 hardware 944 */ 945 static void elantech_set_rate_restore_reg_07(struct psmouse *psmouse, 946 unsigned int rate) 947 { 948 struct elantech_data *etd = psmouse->private; 949 950 etd->original_set_rate(psmouse, rate); 951 if (elantech_write_reg(psmouse, 0x07, etd->reg_07)) 952 psmouse_err(psmouse, "restoring reg_07 failed\n"); 953 } 954 955 /* 956 * Put the touchpad into absolute mode 957 */ 958 static int elantech_set_absolute_mode(struct psmouse *psmouse) 959 { 960 struct elantech_data *etd = psmouse->private; 961 unsigned char val; 962 int tries = ETP_READ_BACK_TRIES; 963 int rc = 0; 964 965 switch (etd->info.hw_version) { 966 case 1: 967 etd->reg_10 = 0x16; 968 etd->reg_11 = 0x8f; 969 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) || 970 elantech_write_reg(psmouse, 0x11, etd->reg_11)) { 971 rc = -1; 972 } 973 break; 974 975 case 2: 976 /* Windows driver values */ 977 etd->reg_10 = 0x54; 978 etd->reg_11 = 0x88; /* 0x8a */ 979 etd->reg_21 = 0x60; /* 0x00 */ 980 if (elantech_write_reg(psmouse, 0x10, etd->reg_10) || 981 elantech_write_reg(psmouse, 0x11, etd->reg_11) || 982 elantech_write_reg(psmouse, 0x21, etd->reg_21)) { 983 rc = -1; 984 } 985 break; 986 987 case 3: 988 if (etd->info.set_hw_resolution) 989 etd->reg_10 = 0x0b; 990 else 991 etd->reg_10 = 0x01; 992 993 if (elantech_write_reg(psmouse, 0x10, etd->reg_10)) 994 rc = -1; 995 996 break; 997 998 case 4: 999 etd->reg_07 = 0x01; 1000 if (elantech_write_reg(psmouse, 0x07, etd->reg_07)) 1001 rc = -1; 1002 1003 goto skip_readback_reg_10; /* v4 has no reg 0x10 to read */ 1004 } 1005 1006 if (rc == 0) { 1007 /* 1008 * Read back reg 0x10. For hardware version 1 we must make 1009 * sure the absolute mode bit is set. For hardware version 2 1010 * the touchpad is probably initializing and not ready until 1011 * we read back the value we just wrote. 1012 */ 1013 do { 1014 rc = elantech_read_reg(psmouse, 0x10, &val); 1015 if (rc == 0) 1016 break; 1017 tries--; 1018 elantech_debug("retrying read (%d).\n", tries); 1019 msleep(ETP_READ_BACK_DELAY); 1020 } while (tries > 0); 1021 1022 if (rc) { 1023 psmouse_err(psmouse, 1024 "failed to read back register 0x10.\n"); 1025 } else if (etd->info.hw_version == 1 && 1026 !(val & ETP_R10_ABSOLUTE_MODE)) { 1027 psmouse_err(psmouse, 1028 "touchpad refuses to switch to absolute mode.\n"); 1029 rc = -1; 1030 } 1031 } 1032 1033 skip_readback_reg_10: 1034 if (rc) 1035 psmouse_err(psmouse, "failed to initialise registers.\n"); 1036 1037 return rc; 1038 } 1039 1040 /* 1041 * (value from firmware) * 10 + 790 = dpi 1042 * we also have to convert dpi to dots/mm (*10/254 to avoid floating point) 1043 */ 1044 static unsigned int elantech_convert_res(unsigned int val) 1045 { 1046 return (val * 10 + 790) * 10 / 254; 1047 } 1048 1049 static int elantech_get_resolution_v4(struct psmouse *psmouse, 1050 unsigned int *x_res, 1051 unsigned int *y_res, 1052 unsigned int *bus) 1053 { 1054 unsigned char param[3]; 1055 1056 if (elantech_send_cmd(psmouse, ETP_RESOLUTION_QUERY, param)) 1057 return -1; 1058 1059 *x_res = elantech_convert_res(param[1] & 0x0f); 1060 *y_res = elantech_convert_res((param[1] & 0xf0) >> 4); 1061 *bus = param[2]; 1062 1063 return 0; 1064 } 1065 1066 static void elantech_set_buttonpad_prop(struct psmouse *psmouse) 1067 { 1068 struct input_dev *dev = psmouse->dev; 1069 struct elantech_data *etd = psmouse->private; 1070 1071 if (elantech_is_buttonpad(&etd->info)) { 1072 __set_bit(INPUT_PROP_BUTTONPAD, dev->propbit); 1073 __clear_bit(BTN_RIGHT, dev->keybit); 1074 } 1075 } 1076 1077 /* 1078 * Some hw_version 4 models do have a middle button 1079 */ 1080 static const struct dmi_system_id elantech_dmi_has_middle_button[] = { 1081 #if defined(CONFIG_DMI) && defined(CONFIG_X86) 1082 { 1083 /* Fujitsu H730 has a middle button */ 1084 .matches = { 1085 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1086 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"), 1087 }, 1088 }, 1089 { 1090 /* Fujitsu H760 also has a middle button */ 1091 .matches = { 1092 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1093 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H760"), 1094 }, 1095 }, 1096 { 1097 /* Fujitsu H780 also has a middle button */ 1098 .matches = { 1099 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1100 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H780"), 1101 }, 1102 }, 1103 #endif 1104 { } 1105 }; 1106 1107 /* 1108 * Set the appropriate event bits for the input subsystem 1109 */ 1110 static int elantech_set_input_params(struct psmouse *psmouse) 1111 { 1112 struct input_dev *dev = psmouse->dev; 1113 struct elantech_data *etd = psmouse->private; 1114 struct elantech_device_info *info = &etd->info; 1115 unsigned int x_min = info->x_min, y_min = info->y_min, 1116 x_max = info->x_max, y_max = info->y_max, 1117 width = info->width; 1118 1119 __set_bit(INPUT_PROP_POINTER, dev->propbit); 1120 __set_bit(EV_KEY, dev->evbit); 1121 __set_bit(EV_ABS, dev->evbit); 1122 __clear_bit(EV_REL, dev->evbit); 1123 1124 __set_bit(BTN_LEFT, dev->keybit); 1125 if (info->has_middle_button) 1126 __set_bit(BTN_MIDDLE, dev->keybit); 1127 __set_bit(BTN_RIGHT, dev->keybit); 1128 1129 __set_bit(BTN_TOUCH, dev->keybit); 1130 __set_bit(BTN_TOOL_FINGER, dev->keybit); 1131 __set_bit(BTN_TOOL_DOUBLETAP, dev->keybit); 1132 __set_bit(BTN_TOOL_TRIPLETAP, dev->keybit); 1133 1134 switch (info->hw_version) { 1135 case 1: 1136 /* Rocker button */ 1137 if (info->fw_version < 0x020000 && 1138 (info->capabilities[0] & ETP_CAP_HAS_ROCKER)) { 1139 __set_bit(BTN_FORWARD, dev->keybit); 1140 __set_bit(BTN_BACK, dev->keybit); 1141 } 1142 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0); 1143 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0); 1144 break; 1145 1146 case 2: 1147 __set_bit(BTN_TOOL_QUADTAP, dev->keybit); 1148 __set_bit(INPUT_PROP_SEMI_MT, dev->propbit); 1149 /* fall through */ 1150 case 3: 1151 if (info->hw_version == 3) 1152 elantech_set_buttonpad_prop(psmouse); 1153 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0); 1154 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0); 1155 if (info->reports_pressure) { 1156 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2, 1157 ETP_PMAX_V2, 0, 0); 1158 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2, 1159 ETP_WMAX_V2, 0, 0); 1160 } 1161 input_mt_init_slots(dev, 2, INPUT_MT_SEMI_MT); 1162 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0); 1163 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0); 1164 break; 1165 1166 case 4: 1167 elantech_set_buttonpad_prop(psmouse); 1168 __set_bit(BTN_TOOL_QUADTAP, dev->keybit); 1169 /* For X to recognize me as touchpad. */ 1170 input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0); 1171 input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0); 1172 /* 1173 * range of pressure and width is the same as v2, 1174 * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility. 1175 */ 1176 input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2, 1177 ETP_PMAX_V2, 0, 0); 1178 input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2, 1179 ETP_WMAX_V2, 0, 0); 1180 /* Multitouch capable pad, up to 5 fingers. */ 1181 input_mt_init_slots(dev, ETP_MAX_FINGERS, 0); 1182 input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0); 1183 input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0); 1184 input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2, 1185 ETP_PMAX_V2, 0, 0); 1186 /* 1187 * The firmware reports how many trace lines the finger spans, 1188 * convert to surface unit as Protocol-B requires. 1189 */ 1190 input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0, 1191 ETP_WMAX_V2 * width, 0, 0); 1192 break; 1193 } 1194 1195 input_abs_set_res(dev, ABS_X, info->x_res); 1196 input_abs_set_res(dev, ABS_Y, info->y_res); 1197 if (info->hw_version > 1) { 1198 input_abs_set_res(dev, ABS_MT_POSITION_X, info->x_res); 1199 input_abs_set_res(dev, ABS_MT_POSITION_Y, info->y_res); 1200 } 1201 1202 etd->y_max = y_max; 1203 etd->width = width; 1204 1205 return 0; 1206 } 1207 1208 struct elantech_attr_data { 1209 size_t field_offset; 1210 unsigned char reg; 1211 }; 1212 1213 /* 1214 * Display a register value by reading a sysfs entry 1215 */ 1216 static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data, 1217 char *buf) 1218 { 1219 struct elantech_data *etd = psmouse->private; 1220 struct elantech_attr_data *attr = data; 1221 unsigned char *reg = (unsigned char *) etd + attr->field_offset; 1222 int rc = 0; 1223 1224 if (attr->reg) 1225 rc = elantech_read_reg(psmouse, attr->reg, reg); 1226 1227 return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg); 1228 } 1229 1230 /* 1231 * Write a register value by writing a sysfs entry 1232 */ 1233 static ssize_t elantech_set_int_attr(struct psmouse *psmouse, 1234 void *data, const char *buf, size_t count) 1235 { 1236 struct elantech_data *etd = psmouse->private; 1237 struct elantech_attr_data *attr = data; 1238 unsigned char *reg = (unsigned char *) etd + attr->field_offset; 1239 unsigned char value; 1240 int err; 1241 1242 err = kstrtou8(buf, 16, &value); 1243 if (err) 1244 return err; 1245 1246 /* Do we need to preserve some bits for version 2 hardware too? */ 1247 if (etd->info.hw_version == 1) { 1248 if (attr->reg == 0x10) 1249 /* Force absolute mode always on */ 1250 value |= ETP_R10_ABSOLUTE_MODE; 1251 else if (attr->reg == 0x11) 1252 /* Force 4 byte mode always on */ 1253 value |= ETP_R11_4_BYTE_MODE; 1254 } 1255 1256 if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0) 1257 *reg = value; 1258 1259 return count; 1260 } 1261 1262 #define ELANTECH_INT_ATTR(_name, _register) \ 1263 static struct elantech_attr_data elantech_attr_##_name = { \ 1264 .field_offset = offsetof(struct elantech_data, _name), \ 1265 .reg = _register, \ 1266 }; \ 1267 PSMOUSE_DEFINE_ATTR(_name, 0644, \ 1268 &elantech_attr_##_name, \ 1269 elantech_show_int_attr, \ 1270 elantech_set_int_attr) 1271 1272 #define ELANTECH_INFO_ATTR(_name) \ 1273 static struct elantech_attr_data elantech_attr_##_name = { \ 1274 .field_offset = offsetof(struct elantech_data, info) + \ 1275 offsetof(struct elantech_device_info, _name), \ 1276 .reg = 0, \ 1277 }; \ 1278 PSMOUSE_DEFINE_ATTR(_name, 0644, \ 1279 &elantech_attr_##_name, \ 1280 elantech_show_int_attr, \ 1281 elantech_set_int_attr) 1282 1283 ELANTECH_INT_ATTR(reg_07, 0x07); 1284 ELANTECH_INT_ATTR(reg_10, 0x10); 1285 ELANTECH_INT_ATTR(reg_11, 0x11); 1286 ELANTECH_INT_ATTR(reg_20, 0x20); 1287 ELANTECH_INT_ATTR(reg_21, 0x21); 1288 ELANTECH_INT_ATTR(reg_22, 0x22); 1289 ELANTECH_INT_ATTR(reg_23, 0x23); 1290 ELANTECH_INT_ATTR(reg_24, 0x24); 1291 ELANTECH_INT_ATTR(reg_25, 0x25); 1292 ELANTECH_INT_ATTR(reg_26, 0x26); 1293 ELANTECH_INFO_ATTR(debug); 1294 ELANTECH_INFO_ATTR(paritycheck); 1295 ELANTECH_INFO_ATTR(crc_enabled); 1296 1297 static struct attribute *elantech_attrs[] = { 1298 &psmouse_attr_reg_07.dattr.attr, 1299 &psmouse_attr_reg_10.dattr.attr, 1300 &psmouse_attr_reg_11.dattr.attr, 1301 &psmouse_attr_reg_20.dattr.attr, 1302 &psmouse_attr_reg_21.dattr.attr, 1303 &psmouse_attr_reg_22.dattr.attr, 1304 &psmouse_attr_reg_23.dattr.attr, 1305 &psmouse_attr_reg_24.dattr.attr, 1306 &psmouse_attr_reg_25.dattr.attr, 1307 &psmouse_attr_reg_26.dattr.attr, 1308 &psmouse_attr_debug.dattr.attr, 1309 &psmouse_attr_paritycheck.dattr.attr, 1310 &psmouse_attr_crc_enabled.dattr.attr, 1311 NULL 1312 }; 1313 1314 static const struct attribute_group elantech_attr_group = { 1315 .attrs = elantech_attrs, 1316 }; 1317 1318 static bool elantech_is_signature_valid(const unsigned char *param) 1319 { 1320 static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 }; 1321 int i; 1322 1323 if (param[0] == 0) 1324 return false; 1325 1326 if (param[1] == 0) 1327 return true; 1328 1329 /* 1330 * Some hw_version >= 4 models have a revision higher then 20. Meaning 1331 * that param[2] may be 10 or 20, skip the rates check for these. 1332 */ 1333 if ((param[0] & 0x0f) >= 0x06 && (param[1] & 0xaf) == 0x0f && 1334 param[2] < 40) 1335 return true; 1336 1337 for (i = 0; i < ARRAY_SIZE(rates); i++) 1338 if (param[2] == rates[i]) 1339 return false; 1340 1341 return true; 1342 } 1343 1344 /* 1345 * Use magic knock to detect Elantech touchpad 1346 */ 1347 int elantech_detect(struct psmouse *psmouse, bool set_properties) 1348 { 1349 struct ps2dev *ps2dev = &psmouse->ps2dev; 1350 unsigned char param[3]; 1351 1352 ps2_command(ps2dev, NULL, PSMOUSE_CMD_RESET_DIS); 1353 1354 if (ps2_command(ps2dev, NULL, PSMOUSE_CMD_DISABLE) || 1355 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || 1356 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || 1357 ps2_command(ps2dev, NULL, PSMOUSE_CMD_SETSCALE11) || 1358 ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) { 1359 psmouse_dbg(psmouse, "sending Elantech magic knock failed.\n"); 1360 return -1; 1361 } 1362 1363 /* 1364 * Report this in case there are Elantech models that use a different 1365 * set of magic numbers 1366 */ 1367 if (param[0] != 0x3c || param[1] != 0x03 || 1368 (param[2] != 0xc8 && param[2] != 0x00)) { 1369 psmouse_dbg(psmouse, 1370 "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n", 1371 param[0], param[1], param[2]); 1372 return -1; 1373 } 1374 1375 /* 1376 * Query touchpad's firmware version and see if it reports known 1377 * value to avoid mis-detection. Logitech mice are known to respond 1378 * to Elantech magic knock and there might be more. 1379 */ 1380 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) { 1381 psmouse_dbg(psmouse, "failed to query firmware version.\n"); 1382 return -1; 1383 } 1384 1385 psmouse_dbg(psmouse, 1386 "Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n", 1387 param[0], param[1], param[2]); 1388 1389 if (!elantech_is_signature_valid(param)) { 1390 psmouse_dbg(psmouse, 1391 "Probably not a real Elantech touchpad. Aborting.\n"); 1392 return -1; 1393 } 1394 1395 if (set_properties) { 1396 psmouse->vendor = "Elantech"; 1397 psmouse->name = "Touchpad"; 1398 } 1399 1400 return 0; 1401 } 1402 1403 /* 1404 * Clean up sysfs entries when disconnecting 1405 */ 1406 static void elantech_disconnect(struct psmouse *psmouse) 1407 { 1408 struct elantech_data *etd = psmouse->private; 1409 1410 /* 1411 * We might have left a breadcrumb when trying to 1412 * set up SMbus companion. 1413 */ 1414 psmouse_smbus_cleanup(psmouse); 1415 1416 if (etd->tp_dev) 1417 input_unregister_device(etd->tp_dev); 1418 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, 1419 &elantech_attr_group); 1420 kfree(psmouse->private); 1421 psmouse->private = NULL; 1422 } 1423 1424 /* 1425 * Put the touchpad back into absolute mode when reconnecting 1426 */ 1427 static int elantech_reconnect(struct psmouse *psmouse) 1428 { 1429 psmouse_reset(psmouse); 1430 1431 if (elantech_detect(psmouse, 0)) 1432 return -1; 1433 1434 if (elantech_set_absolute_mode(psmouse)) { 1435 psmouse_err(psmouse, 1436 "failed to put touchpad back into absolute mode.\n"); 1437 return -1; 1438 } 1439 1440 return 0; 1441 } 1442 1443 /* 1444 * Some hw_version 4 models do not work with crc_disabled 1445 */ 1446 static const struct dmi_system_id elantech_dmi_force_crc_enabled[] = { 1447 #if defined(CONFIG_DMI) && defined(CONFIG_X86) 1448 { 1449 /* Fujitsu H730 does not work with crc_enabled == 0 */ 1450 .matches = { 1451 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1452 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"), 1453 }, 1454 }, 1455 { 1456 /* Fujitsu H760 does not work with crc_enabled == 0 */ 1457 .matches = { 1458 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1459 DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H760"), 1460 }, 1461 }, 1462 { 1463 /* Fujitsu LIFEBOOK E544 does not work with crc_enabled == 0 */ 1464 .matches = { 1465 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1466 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E544"), 1467 }, 1468 }, 1469 { 1470 /* Fujitsu LIFEBOOK E546 does not work with crc_enabled == 0 */ 1471 .matches = { 1472 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1473 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E546"), 1474 }, 1475 }, 1476 { 1477 /* Fujitsu LIFEBOOK E547 does not work with crc_enabled == 0 */ 1478 .matches = { 1479 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1480 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E547"), 1481 }, 1482 }, 1483 { 1484 /* Fujitsu LIFEBOOK E554 does not work with crc_enabled == 0 */ 1485 .matches = { 1486 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1487 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E554"), 1488 }, 1489 }, 1490 { 1491 /* Fujitsu LIFEBOOK E556 does not work with crc_enabled == 0 */ 1492 .matches = { 1493 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1494 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E556"), 1495 }, 1496 }, 1497 { 1498 /* Fujitsu LIFEBOOK E557 does not work with crc_enabled == 0 */ 1499 .matches = { 1500 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1501 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E557"), 1502 }, 1503 }, 1504 { 1505 /* Fujitsu LIFEBOOK U745 does not work with crc_enabled == 0 */ 1506 .matches = { 1507 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"), 1508 DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK U745"), 1509 }, 1510 }, 1511 #endif 1512 { } 1513 }; 1514 1515 /* 1516 * Some hw_version 3 models go into error state when we try to set 1517 * bit 3 and/or bit 1 of r10. 1518 */ 1519 static const struct dmi_system_id no_hw_res_dmi_table[] = { 1520 #if defined(CONFIG_DMI) && defined(CONFIG_X86) 1521 { 1522 /* Gigabyte U2442 */ 1523 .matches = { 1524 DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"), 1525 DMI_MATCH(DMI_PRODUCT_NAME, "U2442"), 1526 }, 1527 }, 1528 #endif 1529 { } 1530 }; 1531 1532 /* 1533 * determine hardware version and set some properties according to it. 1534 */ 1535 static int elantech_set_properties(struct elantech_device_info *info) 1536 { 1537 /* This represents the version of IC body. */ 1538 int ver = (info->fw_version & 0x0f0000) >> 16; 1539 1540 /* Early version of Elan touchpads doesn't obey the rule. */ 1541 if (info->fw_version < 0x020030 || info->fw_version == 0x020600) 1542 info->hw_version = 1; 1543 else { 1544 switch (ver) { 1545 case 2: 1546 case 4: 1547 info->hw_version = 2; 1548 break; 1549 case 5: 1550 info->hw_version = 3; 1551 break; 1552 case 6 ... 15: 1553 info->hw_version = 4; 1554 break; 1555 default: 1556 return -1; 1557 } 1558 } 1559 1560 /* decide which send_cmd we're gonna use early */ 1561 info->send_cmd = info->hw_version >= 3 ? elantech_send_cmd : 1562 synaptics_send_cmd; 1563 1564 /* Turn on packet checking by default */ 1565 info->paritycheck = 1; 1566 1567 /* 1568 * This firmware suffers from misreporting coordinates when 1569 * a touch action starts causing the mouse cursor or scrolled page 1570 * to jump. Enable a workaround. 1571 */ 1572 info->jumpy_cursor = 1573 (info->fw_version == 0x020022 || info->fw_version == 0x020600); 1574 1575 if (info->hw_version > 1) { 1576 /* For now show extra debug information */ 1577 info->debug = 1; 1578 1579 if (info->fw_version >= 0x020800) 1580 info->reports_pressure = true; 1581 } 1582 1583 /* 1584 * The signatures of v3 and v4 packets change depending on the 1585 * value of this hardware flag. 1586 */ 1587 info->crc_enabled = (info->fw_version & 0x4000) == 0x4000 || 1588 dmi_check_system(elantech_dmi_force_crc_enabled); 1589 1590 /* Enable real hardware resolution on hw_version 3 ? */ 1591 info->set_hw_resolution = !dmi_check_system(no_hw_res_dmi_table); 1592 1593 return 0; 1594 } 1595 1596 static int elantech_query_info(struct psmouse *psmouse, 1597 struct elantech_device_info *info) 1598 { 1599 unsigned char param[3]; 1600 unsigned char traces; 1601 1602 memset(info, 0, sizeof(*info)); 1603 1604 /* 1605 * Do the version query again so we can store the result 1606 */ 1607 if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) { 1608 psmouse_err(psmouse, "failed to query firmware version.\n"); 1609 return -EINVAL; 1610 } 1611 info->fw_version = (param[0] << 16) | (param[1] << 8) | param[2]; 1612 1613 if (elantech_set_properties(info)) { 1614 psmouse_err(psmouse, "unknown hardware version, aborting...\n"); 1615 return -EINVAL; 1616 } 1617 psmouse_info(psmouse, 1618 "assuming hardware version %d (with firmware version 0x%02x%02x%02x)\n", 1619 info->hw_version, param[0], param[1], param[2]); 1620 1621 if (info->send_cmd(psmouse, ETP_CAPABILITIES_QUERY, 1622 info->capabilities)) { 1623 psmouse_err(psmouse, "failed to query capabilities.\n"); 1624 return -EINVAL; 1625 } 1626 psmouse_info(psmouse, 1627 "Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n", 1628 info->capabilities[0], info->capabilities[1], 1629 info->capabilities[2]); 1630 1631 if (info->hw_version != 1) { 1632 if (info->send_cmd(psmouse, ETP_SAMPLE_QUERY, info->samples)) { 1633 psmouse_err(psmouse, "failed to query sample data\n"); 1634 return -EINVAL; 1635 } 1636 psmouse_info(psmouse, 1637 "Elan sample query result %02x, %02x, %02x\n", 1638 info->samples[0], 1639 info->samples[1], 1640 info->samples[2]); 1641 } 1642 1643 if (info->samples[1] == 0x74 && info->hw_version == 0x03) { 1644 /* 1645 * This module has a bug which makes absolute mode 1646 * unusable, so let's abort so we'll be using standard 1647 * PS/2 protocol. 1648 */ 1649 psmouse_info(psmouse, 1650 "absolute mode broken, forcing standard PS/2 protocol\n"); 1651 return -ENODEV; 1652 } 1653 1654 /* The MSB indicates the presence of the trackpoint */ 1655 info->has_trackpoint = (info->capabilities[0] & 0x80) == 0x80; 1656 1657 info->x_res = 31; 1658 info->y_res = 31; 1659 if (info->hw_version == 4) { 1660 if (elantech_get_resolution_v4(psmouse, 1661 &info->x_res, 1662 &info->y_res, 1663 &info->bus)) { 1664 psmouse_warn(psmouse, 1665 "failed to query resolution data.\n"); 1666 } 1667 } 1668 1669 /* query range information */ 1670 switch (info->hw_version) { 1671 case 1: 1672 info->x_min = ETP_XMIN_V1; 1673 info->y_min = ETP_YMIN_V1; 1674 info->x_max = ETP_XMAX_V1; 1675 info->y_max = ETP_YMAX_V1; 1676 break; 1677 1678 case 2: 1679 if (info->fw_version == 0x020800 || 1680 info->fw_version == 0x020b00 || 1681 info->fw_version == 0x020030) { 1682 info->x_min = ETP_XMIN_V2; 1683 info->y_min = ETP_YMIN_V2; 1684 info->x_max = ETP_XMAX_V2; 1685 info->y_max = ETP_YMAX_V2; 1686 } else { 1687 int i; 1688 int fixed_dpi; 1689 1690 i = (info->fw_version > 0x020800 && 1691 info->fw_version < 0x020900) ? 1 : 2; 1692 1693 if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param)) 1694 return -EINVAL; 1695 1696 fixed_dpi = param[1] & 0x10; 1697 1698 if (((info->fw_version >> 16) == 0x14) && fixed_dpi) { 1699 if (info->send_cmd(psmouse, ETP_SAMPLE_QUERY, param)) 1700 return -EINVAL; 1701 1702 info->x_max = (info->capabilities[1] - i) * param[1] / 2; 1703 info->y_max = (info->capabilities[2] - i) * param[2] / 2; 1704 } else if (info->fw_version == 0x040216) { 1705 info->x_max = 819; 1706 info->y_max = 405; 1707 } else if (info->fw_version == 0x040219 || info->fw_version == 0x040215) { 1708 info->x_max = 900; 1709 info->y_max = 500; 1710 } else { 1711 info->x_max = (info->capabilities[1] - i) * 64; 1712 info->y_max = (info->capabilities[2] - i) * 64; 1713 } 1714 } 1715 break; 1716 1717 case 3: 1718 if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param)) 1719 return -EINVAL; 1720 1721 info->x_max = (0x0f & param[0]) << 8 | param[1]; 1722 info->y_max = (0xf0 & param[0]) << 4 | param[2]; 1723 break; 1724 1725 case 4: 1726 if (info->send_cmd(psmouse, ETP_FW_ID_QUERY, param)) 1727 return -EINVAL; 1728 1729 info->x_max = (0x0f & param[0]) << 8 | param[1]; 1730 info->y_max = (0xf0 & param[0]) << 4 | param[2]; 1731 traces = info->capabilities[1]; 1732 if ((traces < 2) || (traces > info->x_max)) 1733 return -EINVAL; 1734 1735 info->width = info->x_max / (traces - 1); 1736 1737 /* column number of traces */ 1738 info->x_traces = traces; 1739 1740 /* row number of traces */ 1741 traces = info->capabilities[2]; 1742 if ((traces >= 2) && (traces <= info->y_max)) 1743 info->y_traces = traces; 1744 1745 break; 1746 } 1747 1748 /* check for the middle button: DMI matching or new v4 firmwares */ 1749 info->has_middle_button = dmi_check_system(elantech_dmi_has_middle_button) || 1750 (ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version) && 1751 !elantech_is_buttonpad(info)); 1752 1753 return 0; 1754 } 1755 1756 #if defined(CONFIG_MOUSE_PS2_ELANTECH_SMBUS) 1757 1758 /* 1759 * The newest Elantech device can use a secondary bus (over SMBus) which 1760 * provides a better bandwidth and allow a better control of the touchpads. 1761 * This is used to decide if we need to use this bus or not. 1762 */ 1763 enum { 1764 ELANTECH_SMBUS_NOT_SET = -1, 1765 ELANTECH_SMBUS_OFF, 1766 ELANTECH_SMBUS_ON, 1767 }; 1768 1769 static int elantech_smbus = IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) ? 1770 ELANTECH_SMBUS_NOT_SET : ELANTECH_SMBUS_OFF; 1771 module_param_named(elantech_smbus, elantech_smbus, int, 0644); 1772 MODULE_PARM_DESC(elantech_smbus, "Use a secondary bus for the Elantech device."); 1773 1774 static const char * const i2c_blacklist_pnp_ids[] = { 1775 /* 1776 * These are known to not be working properly as bits are missing 1777 * in elan_i2c. 1778 */ 1779 NULL 1780 }; 1781 1782 static int elantech_create_smbus(struct psmouse *psmouse, 1783 struct elantech_device_info *info, 1784 bool leave_breadcrumbs) 1785 { 1786 struct property_entry i2c_props[11] = {}; 1787 struct i2c_board_info smbus_board = { 1788 I2C_BOARD_INFO("elan_i2c", 0x15), 1789 .flags = I2C_CLIENT_HOST_NOTIFY, 1790 }; 1791 unsigned int idx = 0; 1792 1793 smbus_board.properties = i2c_props; 1794 1795 i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-size-x", 1796 info->x_max + 1); 1797 i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-size-y", 1798 info->y_max + 1); 1799 i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-min-x", 1800 info->x_min); 1801 i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-min-y", 1802 info->y_min); 1803 if (info->x_res) 1804 i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-x-mm", 1805 (info->x_max + 1) / info->x_res); 1806 if (info->y_res) 1807 i2c_props[idx++] = PROPERTY_ENTRY_U32("touchscreen-y-mm", 1808 (info->y_max + 1) / info->y_res); 1809 1810 if (info->has_trackpoint) 1811 i2c_props[idx++] = PROPERTY_ENTRY_BOOL("elan,trackpoint"); 1812 1813 if (info->has_middle_button) 1814 i2c_props[idx++] = PROPERTY_ENTRY_BOOL("elan,middle-button"); 1815 1816 if (info->x_traces) 1817 i2c_props[idx++] = PROPERTY_ENTRY_U32("elan,x_traces", 1818 info->x_traces); 1819 if (info->y_traces) 1820 i2c_props[idx++] = PROPERTY_ENTRY_U32("elan,y_traces", 1821 info->y_traces); 1822 1823 if (elantech_is_buttonpad(info)) 1824 i2c_props[idx++] = PROPERTY_ENTRY_BOOL("elan,clickpad"); 1825 1826 return psmouse_smbus_init(psmouse, &smbus_board, NULL, 0, false, 1827 leave_breadcrumbs); 1828 } 1829 1830 static bool elantech_use_host_notify(struct psmouse *psmouse, 1831 struct elantech_device_info *info) 1832 { 1833 if (ETP_NEW_IC_SMBUS_HOST_NOTIFY(info->fw_version)) 1834 return true; 1835 1836 switch (info->bus) { 1837 case ETP_BUS_PS2_ONLY: 1838 /* expected case */ 1839 break; 1840 case ETP_BUS_SMB_HST_NTFY_ONLY: 1841 case ETP_BUS_PS2_SMB_HST_NTFY: 1842 /* SMbus implementation is stable since 2018 */ 1843 if (dmi_get_bios_year() >= 2018) 1844 return true; 1845 /* fall through */ 1846 default: 1847 psmouse_dbg(psmouse, 1848 "Ignoring SMBus bus provider %d\n", info->bus); 1849 break; 1850 } 1851 1852 return false; 1853 } 1854 1855 /** 1856 * elantech_setup_smbus - called once the PS/2 devices are enumerated 1857 * and decides to instantiate a SMBus InterTouch device. 1858 */ 1859 static int elantech_setup_smbus(struct psmouse *psmouse, 1860 struct elantech_device_info *info, 1861 bool leave_breadcrumbs) 1862 { 1863 int error; 1864 1865 if (elantech_smbus == ELANTECH_SMBUS_OFF) 1866 return -ENXIO; 1867 1868 if (elantech_smbus == ELANTECH_SMBUS_NOT_SET) { 1869 /* 1870 * New ICs are enabled by default, unless mentioned in 1871 * i2c_blacklist_pnp_ids. 1872 * Old ICs are up to the user to decide. 1873 */ 1874 if (!elantech_use_host_notify(psmouse, info) || 1875 psmouse_matches_pnp_id(psmouse, i2c_blacklist_pnp_ids)) 1876 return -ENXIO; 1877 } 1878 1879 psmouse_info(psmouse, "Trying to set up SMBus access\n"); 1880 1881 error = elantech_create_smbus(psmouse, info, leave_breadcrumbs); 1882 if (error) { 1883 if (error == -EAGAIN) 1884 psmouse_info(psmouse, "SMbus companion is not ready yet\n"); 1885 else 1886 psmouse_err(psmouse, "unable to create intertouch device\n"); 1887 1888 return error; 1889 } 1890 1891 return 0; 1892 } 1893 1894 int elantech_init_smbus(struct psmouse *psmouse) 1895 { 1896 struct elantech_device_info info; 1897 int error = -EINVAL; 1898 1899 psmouse_reset(psmouse); 1900 1901 error = elantech_query_info(psmouse, &info); 1902 if (error) 1903 goto init_fail; 1904 1905 if (info.hw_version < 4) { 1906 error = -ENXIO; 1907 goto init_fail; 1908 } 1909 1910 return elantech_create_smbus(psmouse, &info, false); 1911 init_fail: 1912 psmouse_reset(psmouse); 1913 return error; 1914 } 1915 #endif /* CONFIG_MOUSE_PS2_ELANTECH_SMBUS */ 1916 1917 /* 1918 * Initialize the touchpad and create sysfs entries 1919 */ 1920 static int elantech_setup_ps2(struct psmouse *psmouse, 1921 struct elantech_device_info *info) 1922 { 1923 struct elantech_data *etd; 1924 int i; 1925 int error = -EINVAL; 1926 struct input_dev *tp_dev; 1927 1928 psmouse->private = etd = kzalloc(sizeof(*etd), GFP_KERNEL); 1929 if (!etd) 1930 return -ENOMEM; 1931 1932 etd->info = *info; 1933 1934 etd->parity[0] = 1; 1935 for (i = 1; i < 256; i++) 1936 etd->parity[i] = etd->parity[i & (i - 1)] ^ 1; 1937 1938 if (elantech_set_absolute_mode(psmouse)) { 1939 psmouse_err(psmouse, 1940 "failed to put touchpad into absolute mode.\n"); 1941 goto init_fail; 1942 } 1943 1944 if (info->fw_version == 0x381f17) { 1945 etd->original_set_rate = psmouse->set_rate; 1946 psmouse->set_rate = elantech_set_rate_restore_reg_07; 1947 } 1948 1949 if (elantech_set_input_params(psmouse)) { 1950 psmouse_err(psmouse, "failed to query touchpad range.\n"); 1951 goto init_fail; 1952 } 1953 1954 error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj, 1955 &elantech_attr_group); 1956 if (error) { 1957 psmouse_err(psmouse, 1958 "failed to create sysfs attributes, error: %d.\n", 1959 error); 1960 goto init_fail; 1961 } 1962 1963 if (info->has_trackpoint) { 1964 tp_dev = input_allocate_device(); 1965 1966 if (!tp_dev) { 1967 error = -ENOMEM; 1968 goto init_fail_tp_alloc; 1969 } 1970 1971 etd->tp_dev = tp_dev; 1972 snprintf(etd->tp_phys, sizeof(etd->tp_phys), "%s/input1", 1973 psmouse->ps2dev.serio->phys); 1974 tp_dev->phys = etd->tp_phys; 1975 tp_dev->name = "ETPS/2 Elantech TrackPoint"; 1976 tp_dev->id.bustype = BUS_I8042; 1977 tp_dev->id.vendor = 0x0002; 1978 tp_dev->id.product = PSMOUSE_ELANTECH; 1979 tp_dev->id.version = 0x0000; 1980 tp_dev->dev.parent = &psmouse->ps2dev.serio->dev; 1981 tp_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL); 1982 tp_dev->relbit[BIT_WORD(REL_X)] = 1983 BIT_MASK(REL_X) | BIT_MASK(REL_Y); 1984 tp_dev->keybit[BIT_WORD(BTN_LEFT)] = 1985 BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) | 1986 BIT_MASK(BTN_RIGHT); 1987 1988 __set_bit(INPUT_PROP_POINTER, tp_dev->propbit); 1989 __set_bit(INPUT_PROP_POINTING_STICK, tp_dev->propbit); 1990 1991 error = input_register_device(etd->tp_dev); 1992 if (error < 0) 1993 goto init_fail_tp_reg; 1994 } 1995 1996 psmouse->protocol_handler = elantech_process_byte; 1997 psmouse->disconnect = elantech_disconnect; 1998 psmouse->reconnect = elantech_reconnect; 1999 psmouse->pktsize = info->hw_version > 1 ? 6 : 4; 2000 2001 return 0; 2002 init_fail_tp_reg: 2003 input_free_device(tp_dev); 2004 init_fail_tp_alloc: 2005 sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj, 2006 &elantech_attr_group); 2007 init_fail: 2008 kfree(etd); 2009 return error; 2010 } 2011 2012 int elantech_init_ps2(struct psmouse *psmouse) 2013 { 2014 struct elantech_device_info info; 2015 int error = -EINVAL; 2016 2017 psmouse_reset(psmouse); 2018 2019 error = elantech_query_info(psmouse, &info); 2020 if (error) 2021 goto init_fail; 2022 2023 error = elantech_setup_ps2(psmouse, &info); 2024 if (error) 2025 goto init_fail; 2026 2027 return 0; 2028 init_fail: 2029 psmouse_reset(psmouse); 2030 return error; 2031 } 2032 2033 int elantech_init(struct psmouse *psmouse) 2034 { 2035 struct elantech_device_info info; 2036 int error = -EINVAL; 2037 2038 psmouse_reset(psmouse); 2039 2040 error = elantech_query_info(psmouse, &info); 2041 if (error) 2042 goto init_fail; 2043 2044 #if defined(CONFIG_MOUSE_PS2_ELANTECH_SMBUS) 2045 2046 if (elantech_use_host_notify(psmouse, &info)) { 2047 if (!IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) || 2048 !IS_ENABLED(CONFIG_MOUSE_PS2_ELANTECH_SMBUS)) { 2049 psmouse_warn(psmouse, 2050 "The touchpad can support a better bus than the too old PS/2 protocol. " 2051 "Make sure MOUSE_PS2_ELANTECH_SMBUS and MOUSE_ELAN_I2C_SMBUS are enabled to get a better touchpad experience.\n"); 2052 } 2053 error = elantech_setup_smbus(psmouse, &info, true); 2054 if (!error) 2055 return PSMOUSE_ELANTECH_SMBUS; 2056 } 2057 2058 #endif /* CONFIG_MOUSE_PS2_ELANTECH_SMBUS */ 2059 2060 error = elantech_setup_ps2(psmouse, &info); 2061 if (error < 0) { 2062 /* 2063 * Not using any flavor of Elantech support, so clean up 2064 * SMbus breadcrumbs, if any. 2065 */ 2066 psmouse_smbus_cleanup(psmouse); 2067 goto init_fail; 2068 } 2069 2070 return PSMOUSE_ELANTECH; 2071 init_fail: 2072 psmouse_reset(psmouse); 2073 return error; 2074 } 2075