1/*
   2 * Elantech Touchpad driver (v6)
   3 *
   4 * Copyright (C) 2007-2009 Arjan Opmeer <arjan@opmeer.net>
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms of the GNU General Public License version 2 as published
   8 * by the Free Software Foundation.
   9 *
  10 * Trademarks are the property of their respective owners.
  11 */
  12
  13#include <linux/delay.h>
  14#include <linux/dmi.h>
  15#include <linux/slab.h>
  16#include <linux/module.h>
 
  17#include <linux/input.h>
  18#include <linux/input/mt.h>
 
  19#include <linux/serio.h>
  20#include <linux/libps2.h>
  21#include <asm/unaligned.h>
  22#include "psmouse.h"
  23#include "elantech.h"
 
  24
  25#define elantech_debug(fmt, ...)					\
  26	do {								\
  27		if (etd->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 */
  35static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c,
  36				unsigned char *param)
  37{
  38	if (psmouse_sliced_command(psmouse, 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 */
  50static 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 */
  68static 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 */
  95static 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->hw_version) {
 109	case 1:
 110		if (psmouse_sliced_command(psmouse, ETP_REGISTER_READ) ||
 111		    psmouse_sliced_command(psmouse, 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->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 */
 151static 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->hw_version) {
 164	case 1:
 165		if (psmouse_sliced_command(psmouse, ETP_REGISTER_WRITE) ||
 166		    psmouse_sliced_command(psmouse, reg) ||
 167		    psmouse_sliced_command(psmouse, 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 */
 223static void elantech_packet_dump(struct psmouse *psmouse)
 224{
 225	int	i;
 
 
 226
 227	psmouse_printk(KERN_DEBUG, psmouse, "PS/2 packet [");
 228	for (i = 0; i < psmouse->pktsize; i++)
 229		printk("%s0x%02x ", i ? ", " : " ", psmouse->packet[i]);
 230	printk("]\n");
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 231}
 232
 233/*
 234 * Interpret complete data packets and report absolute mode input events for
 235 * hardware version 1. (4 byte packets)
 236 */
 237static void elantech_report_absolute_v1(struct psmouse *psmouse)
 238{
 239	struct input_dev *dev = psmouse->dev;
 240	struct elantech_data *etd = psmouse->private;
 241	unsigned char *packet = psmouse->packet;
 242	int fingers;
 243
 244	if (etd->fw_version < 0x020000) {
 245		/*
 246		 * byte 0:  D   U  p1  p2   1  p3   R   L
 247		 * byte 1:  f   0  th  tw  x9  x8  y9  y8
 248		 */
 249		fingers = ((packet[1] & 0x80) >> 7) +
 250				((packet[1] & 0x30) >> 4);
 251	} else {
 252		/*
 253		 * byte 0: n1  n0  p2  p1   1  p3   R   L
 254		 * byte 1:  0   0   0   0  x9  x8  y9  y8
 255		 */
 256		fingers = (packet[0] & 0xc0) >> 6;
 257	}
 258
 259	if (etd->jumpy_cursor) {
 260		if (fingers != 1) {
 261			etd->single_finger_reports = 0;
 262		} else if (etd->single_finger_reports < 2) {
 263			/* Discard first 2 reports of one finger, bogus */
 264			etd->single_finger_reports++;
 265			elantech_debug("discarding packet\n");
 266			return;
 267		}
 268	}
 269
 270	input_report_key(dev, BTN_TOUCH, fingers != 0);
 271
 272	/*
 273	 * byte 2: x7  x6  x5  x4  x3  x2  x1  x0
 274	 * byte 3: y7  y6  y5  y4  y3  y2  y1  y0
 275	 */
 276	if (fingers) {
 277		input_report_abs(dev, ABS_X,
 278			((packet[1] & 0x0c) << 6) | packet[2]);
 279		input_report_abs(dev, ABS_Y,
 280			etd->y_max - (((packet[1] & 0x03) << 8) | packet[3]));
 281	}
 282
 283	input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
 284	input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
 285	input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
 286	input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
 287	input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
 288
 289	if (etd->fw_version < 0x020000 &&
 290	    (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
 
 
 291		/* rocker up */
 292		input_report_key(dev, BTN_FORWARD, packet[0] & 0x40);
 293		/* rocker down */
 294		input_report_key(dev, BTN_BACK, packet[0] & 0x80);
 295	}
 296
 297	input_sync(dev);
 298}
 299
 300static void elantech_set_slot(struct input_dev *dev, int slot, bool active,
 301			      unsigned int x, unsigned int y)
 302{
 303	input_mt_slot(dev, slot);
 304	input_mt_report_slot_state(dev, MT_TOOL_FINGER, active);
 305	if (active) {
 306		input_report_abs(dev, ABS_MT_POSITION_X, x);
 307		input_report_abs(dev, ABS_MT_POSITION_Y, y);
 308	}
 309}
 310
 311/* x1 < x2 and y1 < y2 when two fingers, x = y = 0 when not pressed */
 312static void elantech_report_semi_mt_data(struct input_dev *dev,
 313					 unsigned int num_fingers,
 314					 unsigned int x1, unsigned int y1,
 315					 unsigned int x2, unsigned int y2)
 316{
 317	elantech_set_slot(dev, 0, num_fingers != 0, x1, y1);
 318	elantech_set_slot(dev, 1, num_fingers >= 2, x2, y2);
 319}
 320
 321/*
 322 * Interpret complete data packets and report absolute mode input events for
 323 * hardware version 2. (6 byte packets)
 324 */
 325static void elantech_report_absolute_v2(struct psmouse *psmouse)
 326{
 327	struct elantech_data *etd = psmouse->private;
 328	struct input_dev *dev = psmouse->dev;
 329	unsigned char *packet = psmouse->packet;
 330	unsigned int fingers, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
 331	unsigned int width = 0, pres = 0;
 332
 333	/* byte 0: n1  n0   .   .   .   .   R   L */
 334	fingers = (packet[0] & 0xc0) >> 6;
 335
 336	switch (fingers) {
 337	case 3:
 338		/*
 339		 * Same as one finger, except report of more than 3 fingers:
 340		 * byte 3:  n4  .   w1  w0   .   .   .   .
 341		 */
 342		if (packet[3] & 0x80)
 343			fingers = 4;
 344		/* pass through... */
 345	case 1:
 346		/*
 347		 * byte 1:  .   .   .   .  x11 x10 x9  x8
 348		 * byte 2: x7  x6  x5  x4  x4  x2  x1  x0
 349		 */
 350		x1 = ((packet[1] & 0x0f) << 8) | packet[2];
 351		/*
 352		 * byte 4:  .   .   .   .  y11 y10 y9  y8
 353		 * byte 5: y7  y6  y5  y4  y3  y2  y1  y0
 354		 */
 355		y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
 356
 357		pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
 358		width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
 359		break;
 360
 361	case 2:
 362		/*
 363		 * The coordinate of each finger is reported separately
 364		 * with a lower resolution for two finger touches:
 365		 * byte 0:  .   .  ay8 ax8  .   .   .   .
 366		 * byte 1: ax7 ax6 ax5 ax4 ax3 ax2 ax1 ax0
 367		 */
 368		x1 = (((packet[0] & 0x10) << 4) | packet[1]) << 2;
 369		/* byte 2: ay7 ay6 ay5 ay4 ay3 ay2 ay1 ay0 */
 370		y1 = etd->y_max -
 371			((((packet[0] & 0x20) << 3) | packet[2]) << 2);
 372		/*
 373		 * byte 3:  .   .  by8 bx8  .   .   .   .
 374		 * byte 4: bx7 bx6 bx5 bx4 bx3 bx2 bx1 bx0
 375		 */
 376		x2 = (((packet[3] & 0x10) << 4) | packet[4]) << 2;
 377		/* byte 5: by7 by8 by5 by4 by3 by2 by1 by0 */
 378		y2 = etd->y_max -
 379			((((packet[3] & 0x20) << 3) | packet[5]) << 2);
 380
 381		/* Unknown so just report sensible values */
 382		pres = 127;
 383		width = 7;
 384		break;
 385	}
 386
 387	input_report_key(dev, BTN_TOUCH, fingers != 0);
 388	if (fingers != 0) {
 389		input_report_abs(dev, ABS_X, x1);
 390		input_report_abs(dev, ABS_Y, y1);
 391	}
 392	elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
 393	input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
 394	input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
 395	input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
 396	input_report_key(dev, BTN_TOOL_QUADTAP, fingers == 4);
 397	input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
 398	input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
 399	if (etd->reports_pressure) {
 400		input_report_abs(dev, ABS_PRESSURE, pres);
 401		input_report_abs(dev, ABS_TOOL_WIDTH, width);
 402	}
 403
 404	input_sync(dev);
 405}
 406
 407static void elantech_report_trackpoint(struct psmouse *psmouse,
 408				       int packet_type)
 409{
 410	/*
 411	 * byte 0:  0   0  sx  sy   0   M   R   L
 412	 * byte 1:~sx   0   0   0   0   0   0   0
 413	 * byte 2:~sy   0   0   0   0   0   0   0
 414	 * byte 3:  0   0 ~sy ~sx   0   1   1   0
 415	 * byte 4: x7  x6  x5  x4  x3  x2  x1  x0
 416	 * byte 5: y7  y6  y5  y4  y3  y2  y1  y0
 417	 *
 418	 * x and y are written in two's complement spread
 419	 * over 9 bits with sx/sy the relative top bit and
 420	 * x7..x0 and y7..y0 the lower bits.
 421	 * The sign of y is opposite to what the input driver
 422	 * expects for a relative movement
 423	 */
 424
 425	struct elantech_data *etd = psmouse->private;
 426	struct input_dev *tp_dev = etd->tp_dev;
 427	unsigned char *packet = psmouse->packet;
 428	int x, y;
 429	u32 t;
 430
 431	t = get_unaligned_le32(&packet[0]);
 432
 433	switch (t & ~7U) {
 434	case 0x06000030U:
 435	case 0x16008020U:
 436	case 0x26800010U:
 437	case 0x36808000U:
 438		x = packet[4] - (int)((packet[1]^0x80) << 1);
 439		y = (int)((packet[2]^0x80) << 1) - packet[5];
 440
 441		input_report_key(tp_dev, BTN_LEFT, packet[0] & 0x01);
 442		input_report_key(tp_dev, BTN_RIGHT, packet[0] & 0x02);
 443		input_report_key(tp_dev, BTN_MIDDLE, packet[0] & 0x04);
 444
 445		input_report_rel(tp_dev, REL_X, x);
 446		input_report_rel(tp_dev, REL_Y, y);
 447
 448		input_sync(tp_dev);
 449
 450		break;
 451
 452	default:
 453		/* Dump unexpected packet sequences if debug=1 (default) */
 454		if (etd->debug == 1)
 455			elantech_packet_dump(psmouse);
 456
 457		break;
 458	}
 459}
 460
 461/*
 462 * Interpret complete data packets and report absolute mode input events for
 463 * hardware version 3. (12 byte packets for two fingers)
 464 */
 465static void elantech_report_absolute_v3(struct psmouse *psmouse,
 466					int packet_type)
 467{
 468	struct input_dev *dev = psmouse->dev;
 469	struct elantech_data *etd = psmouse->private;
 470	unsigned char *packet = psmouse->packet;
 471	unsigned int fingers = 0, x1 = 0, y1 = 0, x2 = 0, y2 = 0;
 472	unsigned int width = 0, pres = 0;
 473
 474	/* byte 0: n1  n0   .   .   .   .   R   L */
 475	fingers = (packet[0] & 0xc0) >> 6;
 476
 477	switch (fingers) {
 478	case 3:
 479	case 1:
 480		/*
 481		 * byte 1:  .   .   .   .  x11 x10 x9  x8
 482		 * byte 2: x7  x6  x5  x4  x4  x2  x1  x0
 483		 */
 484		x1 = ((packet[1] & 0x0f) << 8) | packet[2];
 485		/*
 486		 * byte 4:  .   .   .   .  y11 y10 y9  y8
 487		 * byte 5: y7  y6  y5  y4  y3  y2  y1  y0
 488		 */
 489		y1 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
 490		break;
 491
 492	case 2:
 493		if (packet_type == PACKET_V3_HEAD) {
 494			/*
 495			 * byte 1:   .    .    .    .  ax11 ax10 ax9  ax8
 496			 * byte 2: ax7  ax6  ax5  ax4  ax3  ax2  ax1  ax0
 497			 */
 498			etd->mt[0].x = ((packet[1] & 0x0f) << 8) | packet[2];
 499			/*
 500			 * byte 4:   .    .    .    .  ay11 ay10 ay9  ay8
 501			 * byte 5: ay7  ay6  ay5  ay4  ay3  ay2  ay1  ay0
 502			 */
 503			etd->mt[0].y = etd->y_max -
 504				(((packet[4] & 0x0f) << 8) | packet[5]);
 505			/*
 506			 * wait for next packet
 507			 */
 508			return;
 509		}
 510
 511		/* packet_type == PACKET_V3_TAIL */
 512		x1 = etd->mt[0].x;
 513		y1 = etd->mt[0].y;
 514		x2 = ((packet[1] & 0x0f) << 8) | packet[2];
 515		y2 = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
 516		break;
 517	}
 518
 519	pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
 520	width = ((packet[0] & 0x30) >> 2) | ((packet[3] & 0x30) >> 4);
 521
 522	input_report_key(dev, BTN_TOUCH, fingers != 0);
 523	if (fingers != 0) {
 524		input_report_abs(dev, ABS_X, x1);
 525		input_report_abs(dev, ABS_Y, y1);
 526	}
 527	elantech_report_semi_mt_data(dev, fingers, x1, y1, x2, y2);
 528	input_report_key(dev, BTN_TOOL_FINGER, fingers == 1);
 529	input_report_key(dev, BTN_TOOL_DOUBLETAP, fingers == 2);
 530	input_report_key(dev, BTN_TOOL_TRIPLETAP, fingers == 3);
 531
 532	/* For clickpads map both buttons to BTN_LEFT */
 533	if (etd->fw_version & 0x001000) {
 534		input_report_key(dev, BTN_LEFT, packet[0] & 0x03);
 535	} else {
 536		input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
 537		input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
 538	}
 539
 540	input_report_abs(dev, ABS_PRESSURE, pres);
 541	input_report_abs(dev, ABS_TOOL_WIDTH, width);
 542
 543	input_sync(dev);
 544}
 545
 546static void elantech_input_sync_v4(struct psmouse *psmouse)
 547{
 548	struct input_dev *dev = psmouse->dev;
 549	struct elantech_data *etd = psmouse->private;
 550	unsigned char *packet = psmouse->packet;
 551
 552	/* For clickpads map both buttons to BTN_LEFT */
 553	if (etd->fw_version & 0x001000) {
 554		input_report_key(dev, BTN_LEFT, packet[0] & 0x03);
 555	} else {
 556		input_report_key(dev, BTN_LEFT, packet[0] & 0x01);
 557		input_report_key(dev, BTN_RIGHT, packet[0] & 0x02);
 558		input_report_key(dev, BTN_MIDDLE, packet[0] & 0x04);
 559	}
 560
 561	input_mt_report_pointer_emulation(dev, true);
 562	input_sync(dev);
 563}
 564
 565static void process_packet_status_v4(struct psmouse *psmouse)
 566{
 567	struct input_dev *dev = psmouse->dev;
 568	unsigned char *packet = psmouse->packet;
 569	unsigned fingers;
 570	int i;
 571
 572	/* notify finger state change */
 573	fingers = packet[1] & 0x1f;
 574	for (i = 0; i < ETP_MAX_FINGERS; i++) {
 575		if ((fingers & (1 << i)) == 0) {
 576			input_mt_slot(dev, i);
 577			input_mt_report_slot_state(dev, MT_TOOL_FINGER, false);
 578		}
 579	}
 580
 581	elantech_input_sync_v4(psmouse);
 582}
 583
 584static void process_packet_head_v4(struct psmouse *psmouse)
 585{
 586	struct input_dev *dev = psmouse->dev;
 587	struct elantech_data *etd = psmouse->private;
 588	unsigned char *packet = psmouse->packet;
 589	int id = ((packet[3] & 0xe0) >> 5) - 1;
 590	int pres, traces;
 591
 592	if (id < 0)
 593		return;
 594
 595	etd->mt[id].x = ((packet[1] & 0x0f) << 8) | packet[2];
 596	etd->mt[id].y = etd->y_max - (((packet[4] & 0x0f) << 8) | packet[5]);
 597	pres = (packet[1] & 0xf0) | ((packet[4] & 0xf0) >> 4);
 598	traces = (packet[0] & 0xf0) >> 4;
 599
 600	input_mt_slot(dev, id);
 601	input_mt_report_slot_state(dev, MT_TOOL_FINGER, true);
 602
 603	input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
 604	input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
 605	input_report_abs(dev, ABS_MT_PRESSURE, pres);
 606	input_report_abs(dev, ABS_MT_TOUCH_MAJOR, traces * etd->width);
 607	/* report this for backwards compatibility */
 608	input_report_abs(dev, ABS_TOOL_WIDTH, traces);
 609
 610	elantech_input_sync_v4(psmouse);
 611}
 612
 613static void process_packet_motion_v4(struct psmouse *psmouse)
 614{
 615	struct input_dev *dev = psmouse->dev;
 616	struct elantech_data *etd = psmouse->private;
 617	unsigned char *packet = psmouse->packet;
 618	int weight, delta_x1 = 0, delta_y1 = 0, delta_x2 = 0, delta_y2 = 0;
 619	int id, sid;
 620
 621	id = ((packet[0] & 0xe0) >> 5) - 1;
 622	if (id < 0)
 623		return;
 624
 625	sid = ((packet[3] & 0xe0) >> 5) - 1;
 626	weight = (packet[0] & 0x10) ? ETP_WEIGHT_VALUE : 1;
 627	/*
 628	 * Motion packets give us the delta of x, y values of specific fingers,
 629	 * but in two's complement. Let the compiler do the conversion for us.
 630	 * Also _enlarge_ the numbers to int, in case of overflow.
 631	 */
 632	delta_x1 = (signed char)packet[1];
 633	delta_y1 = (signed char)packet[2];
 634	delta_x2 = (signed char)packet[4];
 635	delta_y2 = (signed char)packet[5];
 636
 637	etd->mt[id].x += delta_x1 * weight;
 638	etd->mt[id].y -= delta_y1 * weight;
 639	input_mt_slot(dev, id);
 640	input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[id].x);
 641	input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[id].y);
 642
 643	if (sid >= 0) {
 644		etd->mt[sid].x += delta_x2 * weight;
 645		etd->mt[sid].y -= delta_y2 * weight;
 646		input_mt_slot(dev, sid);
 647		input_report_abs(dev, ABS_MT_POSITION_X, etd->mt[sid].x);
 648		input_report_abs(dev, ABS_MT_POSITION_Y, etd->mt[sid].y);
 649	}
 650
 651	elantech_input_sync_v4(psmouse);
 652}
 653
 654static void elantech_report_absolute_v4(struct psmouse *psmouse,
 655					int packet_type)
 656{
 657	switch (packet_type) {
 658	case PACKET_V4_STATUS:
 659		process_packet_status_v4(psmouse);
 660		break;
 661
 662	case PACKET_V4_HEAD:
 663		process_packet_head_v4(psmouse);
 664		break;
 665
 666	case PACKET_V4_MOTION:
 667		process_packet_motion_v4(psmouse);
 668		break;
 669
 670	case PACKET_UNKNOWN:
 671	default:
 672		/* impossible to get here */
 673		break;
 674	}
 675}
 676
 677static int elantech_packet_check_v1(struct psmouse *psmouse)
 678{
 679	struct elantech_data *etd = psmouse->private;
 680	unsigned char *packet = psmouse->packet;
 681	unsigned char p1, p2, p3;
 682
 683	/* Parity bits are placed differently */
 684	if (etd->fw_version < 0x020000) {
 685		/* byte 0:  D   U  p1  p2   1  p3   R   L */
 686		p1 = (packet[0] & 0x20) >> 5;
 687		p2 = (packet[0] & 0x10) >> 4;
 688	} else {
 689		/* byte 0: n1  n0  p2  p1   1  p3   R   L */
 690		p1 = (packet[0] & 0x10) >> 4;
 691		p2 = (packet[0] & 0x20) >> 5;
 692	}
 693
 694	p3 = (packet[0] & 0x04) >> 2;
 695
 696	return etd->parity[packet[1]] == p1 &&
 697	       etd->parity[packet[2]] == p2 &&
 698	       etd->parity[packet[3]] == p3;
 699}
 700
 701static int elantech_debounce_check_v2(struct psmouse *psmouse)
 702{
 703        /*
 704         * When we encounter packet that matches this exactly, it means the
 705         * hardware is in debounce status. Just ignore the whole packet.
 706         */
 707        const u8 debounce_packet[] = { 0x84, 0xff, 0xff, 0x02, 0xff, 0xff };
 
 
 708        unsigned char *packet = psmouse->packet;
 709
 710        return !memcmp(packet, debounce_packet, sizeof(debounce_packet));
 711}
 712
 713static int elantech_packet_check_v2(struct psmouse *psmouse)
 714{
 715	struct elantech_data *etd = psmouse->private;
 716	unsigned char *packet = psmouse->packet;
 717
 718	/*
 719	 * V2 hardware has two flavors. Older ones that do not report pressure,
 720	 * and newer ones that reports pressure and width. With newer ones, all
 721	 * packets (1, 2, 3 finger touch) have the same constant bits. With
 722	 * older ones, 1/3 finger touch packets and 2 finger touch packets
 723	 * have different constant bits.
 724	 * With all three cases, if the constant bits are not exactly what I
 725	 * expected, I consider them invalid.
 726	 */
 727	if (etd->reports_pressure)
 728		return (packet[0] & 0x0c) == 0x04 &&
 729		       (packet[3] & 0x0f) == 0x02;
 730
 731	if ((packet[0] & 0xc0) == 0x80)
 732		return (packet[0] & 0x0c) == 0x0c &&
 733		       (packet[3] & 0x0e) == 0x08;
 734
 735	return (packet[0] & 0x3c) == 0x3c &&
 736	       (packet[1] & 0xf0) == 0x00 &&
 737	       (packet[3] & 0x3e) == 0x38 &&
 738	       (packet[4] & 0xf0) == 0x00;
 739}
 740
 741/*
 742 * We check the constant bits to determine what packet type we get,
 743 * so packet checking is mandatory for v3 and later hardware.
 744 */
 745static int elantech_packet_check_v3(struct psmouse *psmouse)
 746{
 747	struct elantech_data *etd = psmouse->private;
 748	const u8 debounce_packet[] = { 0xc4, 0xff, 0xff, 0x02, 0xff, 0xff };
 
 
 749	unsigned char *packet = psmouse->packet;
 750
 751	/*
 752	 * check debounce first, it has the same signature in byte 0
 753	 * and byte 3 as PACKET_V3_HEAD.
 754	 */
 755	if (!memcmp(packet, debounce_packet, sizeof(debounce_packet)))
 756		return PACKET_DEBOUNCE;
 757
 758	/*
 759	 * If the hardware flag 'crc_enabled' is set the packets have
 760	 * different signatures.
 761	 */
 762	if (etd->crc_enabled) {
 763		if ((packet[3] & 0x09) == 0x08)
 764			return PACKET_V3_HEAD;
 765
 766		if ((packet[3] & 0x09) == 0x09)
 767			return PACKET_V3_TAIL;
 768	} else {
 769		if ((packet[0] & 0x0c) == 0x04 && (packet[3] & 0xcf) == 0x02)
 770			return PACKET_V3_HEAD;
 771
 772		if ((packet[0] & 0x0c) == 0x0c && (packet[3] & 0xce) == 0x0c)
 773			return PACKET_V3_TAIL;
 774		if ((packet[3] & 0x0f) == 0x06)
 775			return PACKET_TRACKPOINT;
 776	}
 777
 778	return PACKET_UNKNOWN;
 779}
 780
 781static int elantech_packet_check_v4(struct psmouse *psmouse)
 782{
 783	struct elantech_data *etd = psmouse->private;
 784	unsigned char *packet = psmouse->packet;
 785	unsigned char packet_type = packet[3] & 0x03;
 786	unsigned int ic_version;
 787	bool sanity_check;
 788
 789	if (etd->tp_dev && (packet[3] & 0x0f) == 0x06)
 790		return PACKET_TRACKPOINT;
 791
 792	/* This represents the version of IC body. */
 793	ic_version = (etd->fw_version & 0x0f0000) >> 16;
 794
 795	/*
 796	 * Sanity check based on the constant bits of a packet.
 797	 * The constant bits change depending on the value of
 798	 * the hardware flag 'crc_enabled' and the version of
 799	 * the IC body, but are the same for every packet,
 800	 * regardless of the type.
 801	 */
 802	if (etd->crc_enabled)
 803		sanity_check = ((packet[3] & 0x08) == 0x00);
 804	else if (ic_version == 7 && etd->samples[1] == 0x2A)
 805		sanity_check = ((packet[3] & 0x1c) == 0x10);
 806	else
 807		sanity_check = ((packet[0] & 0x0c) == 0x04 &&
 808				(packet[3] & 0x1c) == 0x10);
 809
 810	if (!sanity_check)
 811		return PACKET_UNKNOWN;
 812
 813	switch (packet_type) {
 814	case 0:
 815		return PACKET_V4_STATUS;
 816
 817	case 1:
 818		return PACKET_V4_HEAD;
 819
 820	case 2:
 821		return PACKET_V4_MOTION;
 822	}
 823
 824	return PACKET_UNKNOWN;
 825}
 826
 827/*
 828 * Process byte stream from mouse and handle complete packets
 829 */
 830static psmouse_ret_t elantech_process_byte(struct psmouse *psmouse)
 831{
 832	struct elantech_data *etd = psmouse->private;
 833	int packet_type;
 834
 835	if (psmouse->pktcnt < psmouse->pktsize)
 836		return PSMOUSE_GOOD_DATA;
 837
 838	if (etd->debug > 1)
 839		elantech_packet_dump(psmouse);
 840
 841	switch (etd->hw_version) {
 842	case 1:
 843		if (etd->paritycheck && !elantech_packet_check_v1(psmouse))
 844			return PSMOUSE_BAD_DATA;
 845
 846		elantech_report_absolute_v1(psmouse);
 847		break;
 848
 849	case 2:
 850		/* ignore debounce */
 851		if (elantech_debounce_check_v2(psmouse))
 852			return PSMOUSE_FULL_PACKET;
 853
 854		if (etd->paritycheck && !elantech_packet_check_v2(psmouse))
 855			return PSMOUSE_BAD_DATA;
 856
 857		elantech_report_absolute_v2(psmouse);
 858		break;
 859
 860	case 3:
 861		packet_type = elantech_packet_check_v3(psmouse);
 862		switch (packet_type) {
 863		case PACKET_UNKNOWN:
 864			return PSMOUSE_BAD_DATA;
 865
 866		case PACKET_DEBOUNCE:
 867			/* ignore debounce */
 868			break;
 869
 870		case PACKET_TRACKPOINT:
 871			elantech_report_trackpoint(psmouse, packet_type);
 872			break;
 873
 874		default:
 875			elantech_report_absolute_v3(psmouse, packet_type);
 876			break;
 877		}
 878
 879		break;
 880
 881	case 4:
 882		packet_type = elantech_packet_check_v4(psmouse);
 883		switch (packet_type) {
 884		case PACKET_UNKNOWN:
 885			return PSMOUSE_BAD_DATA;
 886
 887		case PACKET_TRACKPOINT:
 888			elantech_report_trackpoint(psmouse, packet_type);
 889			break;
 890
 891		default:
 892			elantech_report_absolute_v4(psmouse, packet_type);
 893			break;
 894		}
 895
 896		break;
 897	}
 898
 899	return PSMOUSE_FULL_PACKET;
 900}
 901
 902/*
 903 * This writes the reg_07 value again to the hardware at the end of every
 904 * set_rate call because the register loses its value. reg_07 allows setting
 905 * absolute mode on v4 hardware
 906 */
 907static void elantech_set_rate_restore_reg_07(struct psmouse *psmouse,
 908		unsigned int rate)
 909{
 910	struct elantech_data *etd = psmouse->private;
 911
 912	etd->original_set_rate(psmouse, rate);
 913	if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
 914		psmouse_err(psmouse, "restoring reg_07 failed\n");
 915}
 916
 917/*
 918 * Put the touchpad into absolute mode
 919 */
 920static int elantech_set_absolute_mode(struct psmouse *psmouse)
 921{
 922	struct elantech_data *etd = psmouse->private;
 923	unsigned char val;
 924	int tries = ETP_READ_BACK_TRIES;
 925	int rc = 0;
 926
 927	switch (etd->hw_version) {
 928	case 1:
 929		etd->reg_10 = 0x16;
 930		etd->reg_11 = 0x8f;
 931		if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
 932		    elantech_write_reg(psmouse, 0x11, etd->reg_11)) {
 933			rc = -1;
 934		}
 935		break;
 936
 937	case 2:
 938					/* Windows driver values */
 939		etd->reg_10 = 0x54;
 940		etd->reg_11 = 0x88;	/* 0x8a */
 941		etd->reg_21 = 0x60;	/* 0x00 */
 942		if (elantech_write_reg(psmouse, 0x10, etd->reg_10) ||
 943		    elantech_write_reg(psmouse, 0x11, etd->reg_11) ||
 944		    elantech_write_reg(psmouse, 0x21, etd->reg_21)) {
 945			rc = -1;
 946		}
 947		break;
 948
 949	case 3:
 950		if (etd->set_hw_resolution)
 951			etd->reg_10 = 0x0b;
 952		else
 953			etd->reg_10 = 0x01;
 954
 955		if (elantech_write_reg(psmouse, 0x10, etd->reg_10))
 956			rc = -1;
 957
 958		break;
 959
 960	case 4:
 961		etd->reg_07 = 0x01;
 962		if (elantech_write_reg(psmouse, 0x07, etd->reg_07))
 963			rc = -1;
 964
 965		goto skip_readback_reg_10; /* v4 has no reg 0x10 to read */
 966	}
 967
 968	if (rc == 0) {
 969		/*
 970		 * Read back reg 0x10. For hardware version 1 we must make
 971		 * sure the absolute mode bit is set. For hardware version 2
 972		 * the touchpad is probably initializing and not ready until
 973		 * we read back the value we just wrote.
 974		 */
 975		do {
 976			rc = elantech_read_reg(psmouse, 0x10, &val);
 977			if (rc == 0)
 978				break;
 979			tries--;
 980			elantech_debug("retrying read (%d).\n", tries);
 981			msleep(ETP_READ_BACK_DELAY);
 982		} while (tries > 0);
 983
 984		if (rc) {
 985			psmouse_err(psmouse,
 986				    "failed to read back register 0x10.\n");
 987		} else if (etd->hw_version == 1 &&
 988			   !(val & ETP_R10_ABSOLUTE_MODE)) {
 989			psmouse_err(psmouse,
 990				    "touchpad refuses to switch to absolute mode.\n");
 991			rc = -1;
 992		}
 993	}
 994
 995 skip_readback_reg_10:
 996	if (rc)
 997		psmouse_err(psmouse, "failed to initialise registers.\n");
 998
 999	return rc;
1000}
1001
1002static int elantech_set_range(struct psmouse *psmouse,
1003			      unsigned int *x_min, unsigned int *y_min,
1004			      unsigned int *x_max, unsigned int *y_max,
1005			      unsigned int *width)
1006{
1007	struct elantech_data *etd = psmouse->private;
1008	unsigned char param[3];
1009	unsigned char traces;
1010
1011	switch (etd->hw_version) {
1012	case 1:
1013		*x_min = ETP_XMIN_V1;
1014		*y_min = ETP_YMIN_V1;
1015		*x_max = ETP_XMAX_V1;
1016		*y_max = ETP_YMAX_V1;
1017		break;
1018
1019	case 2:
1020		if (etd->fw_version == 0x020800 ||
1021		    etd->fw_version == 0x020b00 ||
1022		    etd->fw_version == 0x020030) {
1023			*x_min = ETP_XMIN_V2;
1024			*y_min = ETP_YMIN_V2;
1025			*x_max = ETP_XMAX_V2;
1026			*y_max = ETP_YMAX_V2;
1027		} else {
1028			int i;
1029			int fixed_dpi;
1030
1031			i = (etd->fw_version > 0x020800 &&
1032			     etd->fw_version < 0x020900) ? 1 : 2;
1033
1034			if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
1035				return -1;
1036
1037			fixed_dpi = param[1] & 0x10;
1038
1039			if (((etd->fw_version >> 16) == 0x14) && fixed_dpi) {
1040				if (etd->send_cmd(psmouse, ETP_SAMPLE_QUERY, param))
1041					return -1;
1042
1043				*x_max = (etd->capabilities[1] - i) * param[1] / 2;
1044				*y_max = (etd->capabilities[2] - i) * param[2] / 2;
1045			} else if (etd->fw_version == 0x040216) {
1046				*x_max = 819;
1047				*y_max = 405;
1048			} else if (etd->fw_version == 0x040219 || etd->fw_version == 0x040215) {
1049				*x_max = 900;
1050				*y_max = 500;
1051			} else {
1052				*x_max = (etd->capabilities[1] - i) * 64;
1053				*y_max = (etd->capabilities[2] - i) * 64;
1054			}
1055		}
1056		break;
1057
1058	case 3:
1059		if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
1060			return -1;
1061
1062		*x_max = (0x0f & param[0]) << 8 | param[1];
1063		*y_max = (0xf0 & param[0]) << 4 | param[2];
1064		break;
1065
1066	case 4:
1067		if (etd->send_cmd(psmouse, ETP_FW_ID_QUERY, param))
1068			return -1;
1069
1070		*x_max = (0x0f & param[0]) << 8 | param[1];
1071		*y_max = (0xf0 & param[0]) << 4 | param[2];
1072		traces = etd->capabilities[1];
1073		if ((traces < 2) || (traces > *x_max))
1074			return -1;
1075
1076		*width = *x_max / (traces - 1);
1077		break;
1078	}
1079
1080	return 0;
1081}
1082
1083/*
1084 * (value from firmware) * 10 + 790 = dpi
1085 * we also have to convert dpi to dots/mm (*10/254 to avoid floating point)
1086 */
1087static unsigned int elantech_convert_res(unsigned int val)
1088{
1089	return (val * 10 + 790) * 10 / 254;
1090}
1091
1092static int elantech_get_resolution_v4(struct psmouse *psmouse,
1093				      unsigned int *x_res,
1094				      unsigned int *y_res)
 
1095{
1096	unsigned char param[3];
1097
1098	if (elantech_send_cmd(psmouse, ETP_RESOLUTION_QUERY, param))
1099		return -1;
1100
1101	*x_res = elantech_convert_res(param[1] & 0x0f);
1102	*y_res = elantech_convert_res((param[1] & 0xf0) >> 4);
 
1103
1104	return 0;
1105}
1106
1107/*
1108 * Advertise INPUT_PROP_BUTTONPAD for clickpads. The testing of bit 12 in
1109 * fw_version for this is based on the following fw_version & caps table:
1110 *
1111 * Laptop-model:           fw_version:     caps:           buttons:
1112 * Acer S3                 0x461f00        10, 13, 0e      clickpad
1113 * Acer S7-392             0x581f01        50, 17, 0d      clickpad
1114 * Acer V5-131             0x461f02        01, 16, 0c      clickpad
1115 * Acer V5-551             0x461f00        ?               clickpad
1116 * Asus K53SV              0x450f01        78, 15, 0c      2 hw buttons
1117 * Asus G46VW              0x460f02        00, 18, 0c      2 hw buttons
1118 * Asus G750JX             0x360f00        00, 16, 0c      2 hw buttons
1119 * Asus TP500LN            0x381f17        10, 14, 0e      clickpad
1120 * Asus X750JN             0x381f17        10, 14, 0e      clickpad
1121 * Asus UX31               0x361f00        20, 15, 0e      clickpad
1122 * Asus UX32VD             0x361f02        00, 15, 0e      clickpad
1123 * Avatar AVIU-145A2       0x361f00        ?               clickpad
1124 * Fujitsu LIFEBOOK E544   0x470f00        d0, 12, 09      2 hw buttons
1125 * Fujitsu LIFEBOOK E554   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 L430 have the same fw_version/caps
1142 */
1143static 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->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 */
1157static 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#endif
1167	{ }
1168};
1169
1170/*
1171 * Set the appropriate event bits for the input subsystem
1172 */
1173static int elantech_set_input_params(struct psmouse *psmouse)
1174{
1175	struct input_dev *dev = psmouse->dev;
1176	struct elantech_data *etd = psmouse->private;
1177	unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0;
1178	unsigned int x_res = 31, y_res = 31;
1179
1180	if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width))
1181		return -1;
1182
1183	__set_bit(INPUT_PROP_POINTER, dev->propbit);
1184	__set_bit(EV_KEY, dev->evbit);
1185	__set_bit(EV_ABS, dev->evbit);
1186	__clear_bit(EV_REL, dev->evbit);
1187
1188	__set_bit(BTN_LEFT, dev->keybit);
1189	if (dmi_check_system(elantech_dmi_has_middle_button))
1190		__set_bit(BTN_MIDDLE, dev->keybit);
1191	__set_bit(BTN_RIGHT, dev->keybit);
1192
1193	__set_bit(BTN_TOUCH, dev->keybit);
1194	__set_bit(BTN_TOOL_FINGER, dev->keybit);
1195	__set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
1196	__set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
1197
1198	switch (etd->hw_version) {
1199	case 1:
1200		/* Rocker button */
1201		if (etd->fw_version < 0x020000 &&
1202		    (etd->capabilities[0] & ETP_CAP_HAS_ROCKER)) {
1203			__set_bit(BTN_FORWARD, dev->keybit);
1204			__set_bit(BTN_BACK, dev->keybit);
1205		}
1206		input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1207		input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
1208		break;
1209
1210	case 2:
1211		__set_bit(BTN_TOOL_QUADTAP, dev->keybit);
1212		__set_bit(INPUT_PROP_SEMI_MT, dev->propbit);
1213		/* fall through */
1214	case 3:
1215		if (etd->hw_version == 3)
1216			elantech_set_buttonpad_prop(psmouse);
1217		input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1218		input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
1219		if (etd->reports_pressure) {
1220			input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
1221					     ETP_PMAX_V2, 0, 0);
1222			input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
1223					     ETP_WMAX_V2, 0, 0);
1224		}
1225		input_mt_init_slots(dev, 2, INPUT_MT_SEMI_MT);
1226		input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
1227		input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
1228		break;
1229
1230	case 4:
1231		if (elantech_get_resolution_v4(psmouse, &x_res, &y_res)) {
1232			/*
1233			 * if query failed, print a warning and leave the values
1234			 * zero to resemble synaptics.c behavior.
1235			 */
1236			psmouse_warn(psmouse, "couldn't query resolution data.\n");
1237		}
1238		elantech_set_buttonpad_prop(psmouse);
1239		__set_bit(BTN_TOOL_QUADTAP, dev->keybit);
1240		/* For X to recognize me as touchpad. */
1241		input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
1242		input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
1243		/*
1244		 * range of pressure and width is the same as v2,
1245		 * report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility.
1246		 */
1247		input_set_abs_params(dev, ABS_PRESSURE, ETP_PMIN_V2,
1248				     ETP_PMAX_V2, 0, 0);
1249		input_set_abs_params(dev, ABS_TOOL_WIDTH, ETP_WMIN_V2,
1250				     ETP_WMAX_V2, 0, 0);
1251		/* Multitouch capable pad, up to 5 fingers. */
1252		input_mt_init_slots(dev, ETP_MAX_FINGERS, 0);
1253		input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
1254		input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
1255		input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2,
1256				     ETP_PMAX_V2, 0, 0);
1257		/*
1258		 * The firmware reports how many trace lines the finger spans,
1259		 * convert to surface unit as Protocol-B requires.
1260		 */
1261		input_set_abs_params(dev, ABS_MT_TOUCH_MAJOR, 0,
1262				     ETP_WMAX_V2 * width, 0, 0);
1263		break;
1264	}
1265
1266	input_abs_set_res(dev, ABS_X, x_res);
1267	input_abs_set_res(dev, ABS_Y, y_res);
1268	if (etd->hw_version > 1) {
1269		input_abs_set_res(dev, ABS_MT_POSITION_X, x_res);
1270		input_abs_set_res(dev, ABS_MT_POSITION_Y, y_res);
1271	}
1272
1273	etd->y_max = y_max;
1274	etd->width = width;
1275
1276	return 0;
1277}
1278
1279struct elantech_attr_data {
1280	size_t		field_offset;
1281	unsigned char	reg;
1282};
1283
1284/*
1285 * Display a register value by reading a sysfs entry
1286 */
1287static ssize_t elantech_show_int_attr(struct psmouse *psmouse, void *data,
1288					char *buf)
1289{
1290	struct elantech_data *etd = psmouse->private;
1291	struct elantech_attr_data *attr = data;
1292	unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1293	int rc = 0;
1294
1295	if (attr->reg)
1296		rc = elantech_read_reg(psmouse, attr->reg, reg);
1297
1298	return sprintf(buf, "0x%02x\n", (attr->reg && rc) ? -1 : *reg);
1299}
1300
1301/*
1302 * Write a register value by writing a sysfs entry
1303 */
1304static ssize_t elantech_set_int_attr(struct psmouse *psmouse,
1305				     void *data, const char *buf, size_t count)
1306{
1307	struct elantech_data *etd = psmouse->private;
1308	struct elantech_attr_data *attr = data;
1309	unsigned char *reg = (unsigned char *) etd + attr->field_offset;
1310	unsigned char value;
1311	int err;
1312
1313	err = kstrtou8(buf, 16, &value);
1314	if (err)
1315		return err;
1316
1317	/* Do we need to preserve some bits for version 2 hardware too? */
1318	if (etd->hw_version == 1) {
1319		if (attr->reg == 0x10)
1320			/* Force absolute mode always on */
1321			value |= ETP_R10_ABSOLUTE_MODE;
1322		else if (attr->reg == 0x11)
1323			/* Force 4 byte mode always on */
1324			value |= ETP_R11_4_BYTE_MODE;
1325	}
1326
1327	if (!attr->reg || elantech_write_reg(psmouse, attr->reg, value) == 0)
1328		*reg = value;
1329
1330	return count;
1331}
1332
1333#define ELANTECH_INT_ATTR(_name, _register)				\
1334	static struct elantech_attr_data elantech_attr_##_name = {	\
1335		.field_offset = offsetof(struct elantech_data, _name),	\
1336		.reg = _register,					\
1337	};								\
1338	PSMOUSE_DEFINE_ATTR(_name, S_IWUSR | S_IRUGO,			\
1339			    &elantech_attr_##_name,			\
1340			    elantech_show_int_attr,			\
1341			    elantech_set_int_attr)
1342
 
 
 
 
 
 
 
 
 
 
 
1343ELANTECH_INT_ATTR(reg_07, 0x07);
1344ELANTECH_INT_ATTR(reg_10, 0x10);
1345ELANTECH_INT_ATTR(reg_11, 0x11);
1346ELANTECH_INT_ATTR(reg_20, 0x20);
1347ELANTECH_INT_ATTR(reg_21, 0x21);
1348ELANTECH_INT_ATTR(reg_22, 0x22);
1349ELANTECH_INT_ATTR(reg_23, 0x23);
1350ELANTECH_INT_ATTR(reg_24, 0x24);
1351ELANTECH_INT_ATTR(reg_25, 0x25);
1352ELANTECH_INT_ATTR(reg_26, 0x26);
1353ELANTECH_INT_ATTR(debug, 0);
1354ELANTECH_INT_ATTR(paritycheck, 0);
1355ELANTECH_INT_ATTR(crc_enabled, 0);
1356
1357static struct attribute *elantech_attrs[] = {
1358	&psmouse_attr_reg_07.dattr.attr,
1359	&psmouse_attr_reg_10.dattr.attr,
1360	&psmouse_attr_reg_11.dattr.attr,
1361	&psmouse_attr_reg_20.dattr.attr,
1362	&psmouse_attr_reg_21.dattr.attr,
1363	&psmouse_attr_reg_22.dattr.attr,
1364	&psmouse_attr_reg_23.dattr.attr,
1365	&psmouse_attr_reg_24.dattr.attr,
1366	&psmouse_attr_reg_25.dattr.attr,
1367	&psmouse_attr_reg_26.dattr.attr,
1368	&psmouse_attr_debug.dattr.attr,
1369	&psmouse_attr_paritycheck.dattr.attr,
1370	&psmouse_attr_crc_enabled.dattr.attr,
1371	NULL
1372};
1373
1374static struct attribute_group elantech_attr_group = {
1375	.attrs = elantech_attrs,
1376};
1377
1378static bool elantech_is_signature_valid(const unsigned char *param)
1379{
1380	static const unsigned char rates[] = { 200, 100, 80, 60, 40, 20, 10 };
1381	int i;
1382
1383	if (param[0] == 0)
1384		return false;
1385
1386	if (param[1] == 0)
1387		return true;
1388
1389	/*
1390	 * Some hw_version >= 4 models have a revision higher then 20. Meaning
1391	 * that param[2] may be 10 or 20, skip the rates check for these.
1392	 */
1393	if ((param[0] & 0x0f) >= 0x06 && (param[1] & 0xaf) == 0x0f &&
1394	    param[2] < 40)
1395		return true;
1396
1397	for (i = 0; i < ARRAY_SIZE(rates); i++)
1398		if (param[2] == rates[i])
1399			return false;
1400
1401	return true;
1402}
1403
1404/*
1405 * Use magic knock to detect Elantech touchpad
1406 */
1407int elantech_detect(struct psmouse *psmouse, bool set_properties)
1408{
1409	struct ps2dev *ps2dev = &psmouse->ps2dev;
1410	unsigned char param[3];
1411
1412	ps2_command(&psmouse->ps2dev, NULL, PSMOUSE_CMD_RESET_DIS);
1413
1414	if (ps2_command(ps2dev,  NULL, PSMOUSE_CMD_DISABLE) ||
1415	    ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11) ||
1416	    ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11) ||
1417	    ps2_command(ps2dev,  NULL, PSMOUSE_CMD_SETSCALE11) ||
1418	    ps2_command(ps2dev, param, PSMOUSE_CMD_GETINFO)) {
1419		psmouse_dbg(psmouse, "sending Elantech magic knock failed.\n");
1420		return -1;
1421	}
1422
1423	/*
1424	 * Report this in case there are Elantech models that use a different
1425	 * set of magic numbers
1426	 */
1427	if (param[0] != 0x3c || param[1] != 0x03 ||
1428	    (param[2] != 0xc8 && param[2] != 0x00)) {
1429		psmouse_dbg(psmouse,
1430			    "unexpected magic knock result 0x%02x, 0x%02x, 0x%02x.\n",
1431			    param[0], param[1], param[2]);
1432		return -1;
1433	}
1434
1435	/*
1436	 * Query touchpad's firmware version and see if it reports known
1437	 * value to avoid mis-detection. Logitech mice are known to respond
1438	 * to Elantech magic knock and there might be more.
1439	 */
1440	if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
1441		psmouse_dbg(psmouse, "failed to query firmware version.\n");
1442		return -1;
1443	}
1444
1445	psmouse_dbg(psmouse,
1446		    "Elantech version query result 0x%02x, 0x%02x, 0x%02x.\n",
1447		    param[0], param[1], param[2]);
1448
1449	if (!elantech_is_signature_valid(param)) {
1450		psmouse_dbg(psmouse,
1451			    "Probably not a real Elantech touchpad. Aborting.\n");
1452		return -1;
1453	}
1454
1455	if (set_properties) {
1456		psmouse->vendor = "Elantech";
1457		psmouse->name = "Touchpad";
1458	}
1459
1460	return 0;
1461}
1462
1463/*
1464 * Clean up sysfs entries when disconnecting
1465 */
1466static void elantech_disconnect(struct psmouse *psmouse)
1467{
1468	struct elantech_data *etd = psmouse->private;
1469
 
 
 
 
 
 
1470	if (etd->tp_dev)
1471		input_unregister_device(etd->tp_dev);
1472	sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
1473			   &elantech_attr_group);
1474	kfree(psmouse->private);
1475	psmouse->private = NULL;
1476}
1477
1478/*
1479 * Put the touchpad back into absolute mode when reconnecting
1480 */
1481static int elantech_reconnect(struct psmouse *psmouse)
1482{
1483	psmouse_reset(psmouse);
1484
1485	if (elantech_detect(psmouse, 0))
1486		return -1;
1487
1488	if (elantech_set_absolute_mode(psmouse)) {
1489		psmouse_err(psmouse,
1490			    "failed to put touchpad back into absolute mode.\n");
1491		return -1;
1492	}
1493
1494	return 0;
1495}
1496
1497/*
1498 * Some hw_version 4 models do not work with crc_disabled
1499 */
1500static const struct dmi_system_id elantech_dmi_force_crc_enabled[] = {
1501#if defined(CONFIG_DMI) && defined(CONFIG_X86)
1502	{
1503		/* Fujitsu H730 does not work with crc_enabled == 0 */
1504		.matches = {
1505			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1506			DMI_MATCH(DMI_PRODUCT_NAME, "CELSIUS H730"),
1507		},
1508	},
1509	{
1510		/* Fujitsu LIFEBOOK E554  does not work with crc_enabled == 0 */
1511		.matches = {
1512			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1513			DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E554"),
1514		},
1515	},
1516	{
1517		/* Fujitsu LIFEBOOK E544  does not work with crc_enabled == 0 */
1518		.matches = {
1519			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1520			DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK E544"),
1521		},
1522	},
1523	{
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1524		/* Fujitsu LIFEBOOK U745 does not work with crc_enabled == 0 */
1525		.matches = {
1526			DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU"),
1527			DMI_MATCH(DMI_PRODUCT_NAME, "LIFEBOOK U745"),
1528		},
1529	},
1530#endif
1531	{ }
1532};
1533
1534/*
1535 * Some hw_version 3 models go into error state when we try to set
1536 * bit 3 and/or bit 1 of r10.
1537 */
1538static const struct dmi_system_id no_hw_res_dmi_table[] = {
1539#if defined(CONFIG_DMI) && defined(CONFIG_X86)
1540	{
1541		/* Gigabyte U2442 */
1542		.matches = {
1543			DMI_MATCH(DMI_SYS_VENDOR, "GIGABYTE"),
1544			DMI_MATCH(DMI_PRODUCT_NAME, "U2442"),
1545		},
1546	},
1547#endif
1548	{ }
1549};
1550
1551/*
1552 * determine hardware version and set some properties according to it.
1553 */
1554static int elantech_set_properties(struct elantech_data *etd)
1555{
1556	/* This represents the version of IC body. */
1557	int ver = (etd->fw_version & 0x0f0000) >> 16;
1558
1559	/* Early version of Elan touchpads doesn't obey the rule. */
1560	if (etd->fw_version < 0x020030 || etd->fw_version == 0x020600)
1561		etd->hw_version = 1;
1562	else {
1563		switch (ver) {
1564		case 2:
1565		case 4:
1566			etd->hw_version = 2;
1567			break;
1568		case 5:
1569			etd->hw_version = 3;
1570			break;
1571		case 6:
1572		case 7:
1573		case 8:
1574		case 9:
1575		case 10:
1576		case 13:
1577		case 14:
1578			etd->hw_version = 4;
1579			break;
1580		default:
1581			return -1;
1582		}
1583	}
1584
1585	/* decide which send_cmd we're gonna use early */
1586	etd->send_cmd = etd->hw_version >= 3 ? elantech_send_cmd :
1587					       synaptics_send_cmd;
1588
1589	/* Turn on packet checking by default */
1590	etd->paritycheck = 1;
1591
1592	/*
1593	 * This firmware suffers from misreporting coordinates when
1594	 * a touch action starts causing the mouse cursor or scrolled page
1595	 * to jump. Enable a workaround.
1596	 */
1597	etd->jumpy_cursor =
1598		(etd->fw_version == 0x020022 || etd->fw_version == 0x020600);
1599
1600	if (etd->hw_version > 1) {
1601		/* For now show extra debug information */
1602		etd->debug = 1;
1603
1604		if (etd->fw_version >= 0x020800)
1605			etd->reports_pressure = true;
1606	}
1607
1608	/*
1609	 * The signatures of v3 and v4 packets change depending on the
1610	 * value of this hardware flag.
1611	 */
1612	etd->crc_enabled = (etd->fw_version & 0x4000) == 0x4000 ||
1613			   dmi_check_system(elantech_dmi_force_crc_enabled);
1614
1615	/* Enable real hardware resolution on hw_version 3 ? */
1616	etd->set_hw_resolution = !dmi_check_system(no_hw_res_dmi_table);
1617
1618	return 0;
1619}
1620
1621/*
1622 * Initialize the touchpad and create sysfs entries
1623 */
1624int elantech_init(struct psmouse *psmouse)
1625{
1626	struct elantech_data *etd;
1627	int i;
1628	int error = -EINVAL;
1629	unsigned char param[3];
1630	struct input_dev *tp_dev;
1631
1632	psmouse->private = etd = kzalloc(sizeof(struct elantech_data), GFP_KERNEL);
1633	if (!etd)
1634		return -ENOMEM;
1635
1636	psmouse_reset(psmouse);
1637
1638	etd->parity[0] = 1;
1639	for (i = 1; i < 256; i++)
1640		etd->parity[i] = etd->parity[i & (i - 1)] ^ 1;
1641
1642	/*
1643	 * Do the version query again so we can store the result
1644	 */
1645	if (synaptics_send_cmd(psmouse, ETP_FW_VERSION_QUERY, param)) {
1646		psmouse_err(psmouse, "failed to query firmware version.\n");
1647		goto init_fail;
1648	}
1649	etd->fw_version = (param[0] << 16) | (param[1] << 8) | param[2];
1650
1651	if (elantech_set_properties(etd)) {
1652		psmouse_err(psmouse, "unknown hardware version, aborting...\n");
1653		goto init_fail;
1654	}
1655	psmouse_info(psmouse,
1656		     "assuming hardware version %d (with firmware version 0x%02x%02x%02x)\n",
1657		     etd->hw_version, param[0], param[1], param[2]);
1658
1659	if (etd->send_cmd(psmouse, ETP_CAPABILITIES_QUERY,
1660	    etd->capabilities)) {
1661		psmouse_err(psmouse, "failed to query capabilities.\n");
1662		goto init_fail;
1663	}
1664	psmouse_info(psmouse,
1665		     "Synaptics capabilities query result 0x%02x, 0x%02x, 0x%02x.\n",
1666		     etd->capabilities[0], etd->capabilities[1],
1667		     etd->capabilities[2]);
1668
1669	if (etd->hw_version != 1) {
1670		if (etd->send_cmd(psmouse, ETP_SAMPLE_QUERY, etd->samples)) {
1671			psmouse_err(psmouse, "failed to query sample data\n");
1672			goto init_fail;
1673		}
1674		psmouse_info(psmouse,
1675			     "Elan sample query result %02x, %02x, %02x\n",
1676			     etd->samples[0], etd->samples[1], etd->samples[2]);
 
 
1677	}
1678
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1679	if (elantech_set_absolute_mode(psmouse)) {
1680		psmouse_err(psmouse,
1681			    "failed to put touchpad into absolute mode.\n");
1682		goto init_fail;
1683	}
1684
1685	if (etd->fw_version == 0x381f17) {
1686		etd->original_set_rate = psmouse->set_rate;
1687		psmouse->set_rate = elantech_set_rate_restore_reg_07;
1688	}
1689
1690	if (elantech_set_input_params(psmouse)) {
1691		psmouse_err(psmouse, "failed to query touchpad range.\n");
1692		goto init_fail;
1693	}
1694
1695	error = sysfs_create_group(&psmouse->ps2dev.serio->dev.kobj,
1696				   &elantech_attr_group);
1697	if (error) {
1698		psmouse_err(psmouse,
1699			    "failed to create sysfs attributes, error: %d.\n",
1700			    error);
1701		goto init_fail;
1702	}
1703
1704	/* The MSB indicates the presence of the trackpoint */
1705	if ((etd->capabilities[0] & 0x80) == 0x80) {
1706		tp_dev = input_allocate_device();
1707
1708		if (!tp_dev) {
1709			error = -ENOMEM;
1710			goto init_fail_tp_alloc;
1711		}
1712
1713		etd->tp_dev = tp_dev;
1714		snprintf(etd->tp_phys, sizeof(etd->tp_phys), "%s/input1",
1715			psmouse->ps2dev.serio->phys);
1716		tp_dev->phys = etd->tp_phys;
1717		tp_dev->name = "Elantech PS/2 TrackPoint";
1718		tp_dev->id.bustype = BUS_I8042;
1719		tp_dev->id.vendor  = 0x0002;
1720		tp_dev->id.product = PSMOUSE_ELANTECH;
1721		tp_dev->id.version = 0x0000;
1722		tp_dev->dev.parent = &psmouse->ps2dev.serio->dev;
1723		tp_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
1724		tp_dev->relbit[BIT_WORD(REL_X)] =
1725			BIT_MASK(REL_X) | BIT_MASK(REL_Y);
1726		tp_dev->keybit[BIT_WORD(BTN_LEFT)] =
1727			BIT_MASK(BTN_LEFT) | BIT_MASK(BTN_MIDDLE) |
1728			BIT_MASK(BTN_RIGHT);
1729
1730		__set_bit(INPUT_PROP_POINTER, tp_dev->propbit);
1731		__set_bit(INPUT_PROP_POINTING_STICK, tp_dev->propbit);
1732
1733		error = input_register_device(etd->tp_dev);
1734		if (error < 0)
1735			goto init_fail_tp_reg;
1736	}
1737
1738	psmouse->protocol_handler = elantech_process_byte;
1739	psmouse->disconnect = elantech_disconnect;
1740	psmouse->reconnect = elantech_reconnect;
1741	psmouse->pktsize = etd->hw_version > 1 ? 6 : 4;
1742
1743	return 0;
1744 init_fail_tp_reg:
1745	input_free_device(tp_dev);
1746 init_fail_tp_alloc:
1747	sysfs_remove_group(&psmouse->ps2dev.serio->dev.kobj,
1748			   &elantech_attr_group);
1749 init_fail:
1750	psmouse_reset(psmouse);
1751	kfree(etd);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1752	return error;
1753}