1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Elan I2C/SMBus Touchpad driver
   4 *
   5 * Copyright (c) 2013 ELAN Microelectronics Corp.
   6 *
   7 * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw>
   8 * Author: KT Liao <kt.liao@emc.com.tw>
   9 * Version: 1.6.3
  10 *
  11 * Based on cyapa driver:
  12 * copyright (c) 2011-2012 Cypress Semiconductor, Inc.
  13 * copyright (c) 2011-2012 Google, Inc.
  14 *
  15 * Trademarks are the property of their respective owners.
  16 */
  17
  18#include <linux/acpi.h>
  19#include <linux/delay.h>
  20#include <linux/device.h>
  21#include <linux/firmware.h>
  22#include <linux/i2c.h>
  23#include <linux/init.h>
  24#include <linux/input/mt.h>
  25#include <linux/interrupt.h>
  26#include <linux/irq.h>
  27#include <linux/module.h>
  28#include <linux/slab.h>
  29#include <linux/kernel.h>
  30#include <linux/sched.h>
  31#include <linux/input.h>
  32#include <linux/uaccess.h>
  33#include <linux/jiffies.h>
  34#include <linux/completion.h>
  35#include <linux/of.h>
  36#include <linux/pm_wakeirq.h>
  37#include <linux/property.h>
  38#include <linux/regulator/consumer.h>
  39#include <asm/unaligned.h>
  40
  41#include "elan_i2c.h"
  42
  43#define DRIVER_NAME		"elan_i2c"
  44#define ELAN_VENDOR_ID		0x04f3
  45#define ETP_MAX_PRESSURE	255
  46#define ETP_FWIDTH_REDUCE	90
  47#define ETP_FINGER_WIDTH	15
  48#define ETP_RETRY_COUNT		3
  49
  50/* quirks to control the device */
  51#define ETP_QUIRK_QUICK_WAKEUP	BIT(0)
  52
  53/* The main device structure */
  54struct elan_tp_data {
  55	struct i2c_client	*client;
  56	struct input_dev	*input;
  57	struct input_dev	*tp_input; /* trackpoint input node */
  58	struct regulator	*vcc;
  59
  60	const struct elan_transport_ops *ops;
  61
  62	/* for fw update */
  63	struct completion	fw_completion;
  64	bool			in_fw_update;
  65
  66	struct mutex		sysfs_mutex;
  67
  68	unsigned int		max_x;
  69	unsigned int		max_y;
  70	unsigned int		width_x;
  71	unsigned int		width_y;
  72	unsigned int		x_res;
  73	unsigned int		y_res;
  74
  75	u8			pattern;
  76	u16			product_id;
  77	u8			fw_version;
  78	u8			sm_version;
  79	u8			iap_version;
  80	u16			fw_checksum;
  81	unsigned int		report_features;
  82	unsigned int		report_len;
  83	int			pressure_adjustment;
  84	u8			mode;
  85	u16			ic_type;
  86	u16			fw_validpage_count;
  87	u16			fw_page_size;
  88	u32			fw_signature_address;
  89
  90	u8			min_baseline;
  91	u8			max_baseline;
  92	bool			baseline_ready;
  93	u8			clickpad;
  94	bool			middle_button;
  95
  96	u32			quirks;		/* Various quirks */
  97};
  98
  99static u32 elan_i2c_lookup_quirks(u16 ic_type, u16 product_id)
 100{
 101	static const struct {
 102		u16 ic_type;
 103		u16 product_id;
 104		u32 quirks;
 105	} elan_i2c_quirks[] = {
 106		{ 0x0D, ETP_PRODUCT_ID_DELBIN, ETP_QUIRK_QUICK_WAKEUP },
 107		{ 0x0D, ETP_PRODUCT_ID_WHITEBOX, ETP_QUIRK_QUICK_WAKEUP },
 108		{ 0x10, ETP_PRODUCT_ID_VOXEL, ETP_QUIRK_QUICK_WAKEUP },
 109		{ 0x14, ETP_PRODUCT_ID_MAGPIE, ETP_QUIRK_QUICK_WAKEUP },
 110		{ 0x14, ETP_PRODUCT_ID_BOBBA, ETP_QUIRK_QUICK_WAKEUP },
 111	};
 112	u32 quirks = 0;
 113	int i;
 114
 115	for (i = 0; i < ARRAY_SIZE(elan_i2c_quirks); i++) {
 116		if (elan_i2c_quirks[i].ic_type == ic_type &&
 117		    elan_i2c_quirks[i].product_id == product_id) {
 118			quirks = elan_i2c_quirks[i].quirks;
 119		}
 120	}
 121
 122	if (ic_type >= 0x0D && product_id >= 0x123)
 123		quirks |= ETP_QUIRK_QUICK_WAKEUP;
 124
 125	return quirks;
 126}
 127
 128static int elan_get_fwinfo(u16 ic_type, u8 iap_version, u16 *validpage_count,
 129			   u32 *signature_address, u16 *page_size)
 130{
 131	switch (ic_type) {
 132	case 0x00:
 133	case 0x06:
 134	case 0x08:
 135		*validpage_count = 512;
 136		break;
 137	case 0x03:
 138	case 0x07:
 139	case 0x09:
 140	case 0x0A:
 141	case 0x0B:
 142	case 0x0C:
 143		*validpage_count = 768;
 144		break;
 145	case 0x0D:
 146		*validpage_count = 896;
 147		break;
 148	case 0x0E:
 149		*validpage_count = 640;
 150		break;
 151	case 0x10:
 152		*validpage_count = 1024;
 153		break;
 154	case 0x11:
 155		*validpage_count = 1280;
 156		break;
 157	case 0x13:
 158		*validpage_count = 2048;
 159		break;
 160	case 0x14:
 161	case 0x15:
 162		*validpage_count = 1024;
 163		break;
 164	default:
 165		/* unknown ic type clear value */
 166		*validpage_count = 0;
 167		*signature_address = 0;
 168		*page_size = 0;
 169		return -ENXIO;
 170	}
 171
 172	*signature_address =
 173		(*validpage_count * ETP_FW_PAGE_SIZE) - ETP_FW_SIGNATURE_SIZE;
 174
 175	if ((ic_type == 0x14 || ic_type == 0x15) && iap_version >= 2) {
 176		*validpage_count /= 8;
 177		*page_size = ETP_FW_PAGE_SIZE_512;
 178	} else if (ic_type >= 0x0D && iap_version >= 1) {
 179		*validpage_count /= 2;
 180		*page_size = ETP_FW_PAGE_SIZE_128;
 181	} else {
 182		*page_size = ETP_FW_PAGE_SIZE;
 183	}
 184
 185	return 0;
 186}
 187
 188static int elan_set_power(struct elan_tp_data *data, bool on)
 189{
 190	int repeat = ETP_RETRY_COUNT;
 191	int error;
 192
 193	do {
 194		error = data->ops->power_control(data->client, on);
 195		if (error >= 0)
 196			return 0;
 197
 198		msleep(30);
 199	} while (--repeat > 0);
 200
 201	dev_err(&data->client->dev, "failed to set power %s: %d\n",
 202		on ? "on" : "off", error);
 203	return error;
 204}
 205
 206static int elan_sleep(struct elan_tp_data *data)
 207{
 208	int repeat = ETP_RETRY_COUNT;
 209	int error;
 210
 211	do {
 212		error = data->ops->sleep_control(data->client, true);
 213		if (!error)
 214			return 0;
 215
 216		msleep(30);
 217	} while (--repeat > 0);
 218
 219	return error;
 220}
 221
 222static int elan_query_product(struct elan_tp_data *data)
 223{
 224	int error;
 225
 226	error = data->ops->get_product_id(data->client, &data->product_id);
 227	if (error)
 228		return error;
 229
 230	error = data->ops->get_pattern(data->client, &data->pattern);
 231	if (error)
 232		return error;
 233
 234	error = data->ops->get_sm_version(data->client, data->pattern,
 235					  &data->ic_type, &data->sm_version,
 236					  &data->clickpad);
 237	if (error)
 238		return error;
 239
 240	return 0;
 241}
 242
 243static int elan_check_ASUS_special_fw(struct elan_tp_data *data)
 244{
 245	if (data->ic_type == 0x0E) {
 246		switch (data->product_id) {
 247		case 0x05 ... 0x07:
 248		case 0x09:
 249		case 0x13:
 250			return true;
 251		}
 252	} else if (data->ic_type == 0x08 && data->product_id == 0x26) {
 253		/* ASUS EeeBook X205TA */
 254		return true;
 255	}
 256
 257	return false;
 258}
 259
 260static int __elan_initialize(struct elan_tp_data *data, bool skip_reset)
 261{
 262	struct i2c_client *client = data->client;
 263	bool woken_up = false;
 264	int error;
 265
 266	if (!skip_reset) {
 267		error = data->ops->initialize(client);
 268		if (error) {
 269			dev_err(&client->dev, "device initialize failed: %d\n", error);
 270			return error;
 271		}
 272	}
 273
 274	error = elan_query_product(data);
 275	if (error)
 276		return error;
 277
 278	/*
 279	 * Some ASUS devices were shipped with firmware that requires
 280	 * touchpads to be woken up first, before attempting to switch
 281	 * them into absolute reporting mode.
 282	 */
 283	if (elan_check_ASUS_special_fw(data)) {
 284		error = data->ops->sleep_control(client, false);
 285		if (error) {
 286			dev_err(&client->dev,
 287				"failed to wake device up: %d\n", error);
 288			return error;
 289		}
 290
 291		msleep(200);
 292		woken_up = true;
 293	}
 294
 295	data->mode |= ETP_ENABLE_ABS;
 296	error = data->ops->set_mode(client, data->mode);
 297	if (error) {
 298		dev_err(&client->dev,
 299			"failed to switch to absolute mode: %d\n", error);
 300		return error;
 301	}
 302
 303	if (!woken_up) {
 304		error = data->ops->sleep_control(client, false);
 305		if (error) {
 306			dev_err(&client->dev,
 307				"failed to wake device up: %d\n", error);
 308			return error;
 309		}
 310	}
 311
 312	return 0;
 313}
 314
 315static int elan_initialize(struct elan_tp_data *data, bool skip_reset)
 316{
 317	int repeat = ETP_RETRY_COUNT;
 318	int error;
 319
 320	do {
 321		error = __elan_initialize(data, skip_reset);
 322		if (!error)
 323			return 0;
 324
 325		skip_reset = false;
 326		msleep(30);
 327	} while (--repeat > 0);
 328
 329	return error;
 330}
 331
 332static int elan_query_device_info(struct elan_tp_data *data)
 333{
 334	int error;
 335
 336	error = data->ops->get_version(data->client, data->pattern, false,
 337				       &data->fw_version);
 338	if (error)
 339		return error;
 340
 341	error = data->ops->get_checksum(data->client, false,
 342					&data->fw_checksum);
 343	if (error)
 344		return error;
 345
 346	error = data->ops->get_version(data->client, data->pattern,
 347				       true, &data->iap_version);
 348	if (error)
 349		return error;
 350
 351	error = data->ops->get_pressure_adjustment(data->client,
 352						   &data->pressure_adjustment);
 353	if (error)
 354		return error;
 355
 356	error = data->ops->get_report_features(data->client, data->pattern,
 357					       &data->report_features,
 358					       &data->report_len);
 359	if (error)
 360		return error;
 361
 362	data->quirks = elan_i2c_lookup_quirks(data->ic_type, data->product_id);
 363
 364	error = elan_get_fwinfo(data->ic_type, data->iap_version,
 365				&data->fw_validpage_count,
 366				&data->fw_signature_address,
 367				&data->fw_page_size);
 368	if (error)
 369		dev_warn(&data->client->dev,
 370			 "unexpected iap version %#04x (ic type: %#04x), firmware update will not work\n",
 371			 data->iap_version, data->ic_type);
 372
 373	return 0;
 374}
 375
 376static unsigned int elan_convert_resolution(u8 val, u8 pattern)
 377{
 378	/*
 379	 * pattern <= 0x01:
 380	 *	(value from firmware) * 10 + 790 = dpi
 381	 * else
 382	 *	((value from firmware) + 3) * 100 = dpi
 383	 */
 384	int res = pattern <= 0x01 ?
 385		(int)(char)val * 10 + 790 : ((int)(char)val + 3) * 100;
 386	/*
 387	 * We also have to convert dpi to dots/mm (*10/254 to avoid floating
 388	 * point).
 389	 */
 390	return res * 10 / 254;
 391}
 392
 393static int elan_query_device_parameters(struct elan_tp_data *data)
 394{
 395	struct i2c_client *client = data->client;
 396	unsigned int x_traces, y_traces;
 397	u32 x_mm, y_mm;
 398	u8 hw_x_res, hw_y_res;
 399	int error;
 400
 401	if (device_property_read_u32(&client->dev,
 402				     "touchscreen-size-x", &data->max_x) ||
 403	    device_property_read_u32(&client->dev,
 404				     "touchscreen-size-y", &data->max_y)) {
 405		error = data->ops->get_max(data->client,
 406					   &data->max_x,
 407					   &data->max_y);
 408		if (error)
 409			return error;
 410	} else {
 411		/* size is the maximum + 1 */
 412		--data->max_x;
 413		--data->max_y;
 414	}
 415
 416	if (device_property_read_u32(&client->dev,
 417				     "elan,x_traces",
 418				     &x_traces) ||
 419	    device_property_read_u32(&client->dev,
 420				     "elan,y_traces",
 421				     &y_traces)) {
 422		error = data->ops->get_num_traces(data->client,
 423						  &x_traces, &y_traces);
 424		if (error)
 425			return error;
 426	}
 427	data->width_x = data->max_x / x_traces;
 428	data->width_y = data->max_y / y_traces;
 429
 430	if (device_property_read_u32(&client->dev,
 431				     "touchscreen-x-mm", &x_mm) ||
 432	    device_property_read_u32(&client->dev,
 433				     "touchscreen-y-mm", &y_mm)) {
 434		error = data->ops->get_resolution(data->client,
 435						  &hw_x_res, &hw_y_res);
 436		if (error)
 437			return error;
 438
 439		data->x_res = elan_convert_resolution(hw_x_res, data->pattern);
 440		data->y_res = elan_convert_resolution(hw_y_res, data->pattern);
 441	} else {
 442		data->x_res = (data->max_x + 1) / x_mm;
 443		data->y_res = (data->max_y + 1) / y_mm;
 444	}
 445
 446	if (device_property_read_bool(&client->dev, "elan,clickpad"))
 447		data->clickpad = 1;
 448
 449	if (device_property_read_bool(&client->dev, "elan,middle-button"))
 450		data->middle_button = true;
 451
 452	return 0;
 453}
 454
 455/*
 456 **********************************************************
 457 * IAP firmware updater related routines
 458 **********************************************************
 459 */
 460static int elan_write_fw_block(struct elan_tp_data *data, u16 page_size,
 461			       const u8 *page, u16 checksum, int idx)
 462{
 463	int retry = ETP_RETRY_COUNT;
 464	int error;
 465
 466	do {
 467		error = data->ops->write_fw_block(data->client, page_size,
 468						  page, checksum, idx);
 469		if (!error)
 470			return 0;
 471
 472		dev_dbg(&data->client->dev,
 473			"IAP retrying page %d (error: %d)\n", idx, error);
 474	} while (--retry > 0);
 475
 476	return error;
 477}
 478
 479static int __elan_update_firmware(struct elan_tp_data *data,
 480				  const struct firmware *fw)
 481{
 482	struct i2c_client *client = data->client;
 483	struct device *dev = &client->dev;
 484	int i, j;
 485	int error;
 486	u16 iap_start_addr;
 487	u16 boot_page_count;
 488	u16 sw_checksum = 0, fw_checksum = 0;
 489
 490	error = data->ops->prepare_fw_update(client, data->ic_type,
 491					     data->iap_version,
 492					     data->fw_page_size);
 493	if (error)
 494		return error;
 495
 496	iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]);
 497
 498	boot_page_count = (iap_start_addr * 2) / data->fw_page_size;
 499	for (i = boot_page_count; i < data->fw_validpage_count; i++) {
 500		u16 checksum = 0;
 501		const u8 *page = &fw->data[i * data->fw_page_size];
 502
 503		for (j = 0; j < data->fw_page_size; j += 2)
 504			checksum += ((page[j + 1] << 8) | page[j]);
 505
 506		error = elan_write_fw_block(data, data->fw_page_size,
 507					    page, checksum, i);
 508		if (error) {
 509			dev_err(dev, "write page %d fail: %d\n", i, error);
 510			return error;
 511		}
 512
 513		sw_checksum += checksum;
 514	}
 515
 516	/* Wait WDT reset and power on reset */
 517	msleep(600);
 518
 519	error = data->ops->finish_fw_update(client, &data->fw_completion);
 520	if (error)
 521		return error;
 522
 523	error = data->ops->get_checksum(client, true, &fw_checksum);
 524	if (error)
 525		return error;
 526
 527	if (sw_checksum != fw_checksum) {
 528		dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n",
 529			sw_checksum, fw_checksum);
 530		return -EIO;
 531	}
 532
 533	return 0;
 534}
 535
 536static int elan_update_firmware(struct elan_tp_data *data,
 537				const struct firmware *fw)
 538{
 539	struct i2c_client *client = data->client;
 540	int retval;
 541
 542	dev_dbg(&client->dev, "Starting firmware update....\n");
 543
 544	disable_irq(client->irq);
 545	data->in_fw_update = true;
 546
 547	retval = __elan_update_firmware(data, fw);
 548	if (retval) {
 549		dev_err(&client->dev, "firmware update failed: %d\n", retval);
 550		data->ops->iap_reset(client);
 551	} else {
 552		/* Reinitialize TP after fw is updated */
 553		elan_initialize(data, false);
 554		elan_query_device_info(data);
 555	}
 556
 557	data->in_fw_update = false;
 558	enable_irq(client->irq);
 559
 560	return retval;
 561}
 562
 563/*
 564 *******************************************************************
 565 * SYSFS attributes
 566 *******************************************************************
 567 */
 568static ssize_t elan_sysfs_read_fw_checksum(struct device *dev,
 569					   struct device_attribute *attr,
 570					   char *buf)
 571{
 572	struct i2c_client *client = to_i2c_client(dev);
 573	struct elan_tp_data *data = i2c_get_clientdata(client);
 574
 575	return sprintf(buf, "0x%04x\n", data->fw_checksum);
 576}
 577
 578static ssize_t elan_sysfs_read_product_id(struct device *dev,
 579					 struct device_attribute *attr,
 580					 char *buf)
 581{
 582	struct i2c_client *client = to_i2c_client(dev);
 583	struct elan_tp_data *data = i2c_get_clientdata(client);
 584
 585	return sprintf(buf, ETP_PRODUCT_ID_FORMAT_STRING "\n",
 586		       data->product_id);
 587}
 588
 589static ssize_t elan_sysfs_read_fw_ver(struct device *dev,
 590				      struct device_attribute *attr,
 591				      char *buf)
 592{
 593	struct i2c_client *client = to_i2c_client(dev);
 594	struct elan_tp_data *data = i2c_get_clientdata(client);
 595
 596	return sprintf(buf, "%d.0\n", data->fw_version);
 597}
 598
 599static ssize_t elan_sysfs_read_sm_ver(struct device *dev,
 600				      struct device_attribute *attr,
 601				      char *buf)
 602{
 603	struct i2c_client *client = to_i2c_client(dev);
 604	struct elan_tp_data *data = i2c_get_clientdata(client);
 605
 606	return sprintf(buf, "%d.0\n", data->sm_version);
 607}
 608
 609static ssize_t elan_sysfs_read_iap_ver(struct device *dev,
 610				       struct device_attribute *attr,
 611				       char *buf)
 612{
 613	struct i2c_client *client = to_i2c_client(dev);
 614	struct elan_tp_data *data = i2c_get_clientdata(client);
 615
 616	return sprintf(buf, "%d.0\n", data->iap_version);
 617}
 618
 619static ssize_t elan_sysfs_update_fw(struct device *dev,
 620				    struct device_attribute *attr,
 621				    const char *buf, size_t count)
 622{
 623	struct elan_tp_data *data = dev_get_drvdata(dev);
 624	const struct firmware *fw;
 625	char *fw_name;
 626	int error;
 627	const u8 *fw_signature;
 628	static const u8 signature[] = {0xAA, 0x55, 0xCC, 0x33, 0xFF, 0xFF};
 629
 630	if (data->fw_validpage_count == 0)
 631		return -EINVAL;
 632
 633	/* Look for a firmware with the product id appended. */
 634	fw_name = kasprintf(GFP_KERNEL, ETP_FW_NAME, data->product_id);
 635	if (!fw_name) {
 636		dev_err(dev, "failed to allocate memory for firmware name\n");
 637		return -ENOMEM;
 638	}
 639
 640	dev_info(dev, "requesting fw '%s'\n", fw_name);
 641	error = request_firmware(&fw, fw_name, dev);
 642	kfree(fw_name);
 643	if (error) {
 644		dev_err(dev, "failed to request firmware: %d\n", error);
 645		return error;
 646	}
 647
 648	/* Firmware file must match signature data */
 649	fw_signature = &fw->data[data->fw_signature_address];
 650	if (memcmp(fw_signature, signature, sizeof(signature)) != 0) {
 651		dev_err(dev, "signature mismatch (expected %*ph, got %*ph)\n",
 652			(int)sizeof(signature), signature,
 653			(int)sizeof(signature), fw_signature);
 654		error = -EBADF;
 655		goto out_release_fw;
 656	}
 657
 658	error = mutex_lock_interruptible(&data->sysfs_mutex);
 659	if (error)
 660		goto out_release_fw;
 661
 662	error = elan_update_firmware(data, fw);
 663
 664	mutex_unlock(&data->sysfs_mutex);
 665
 666out_release_fw:
 667	release_firmware(fw);
 668	return error ?: count;
 669}
 670
 671static ssize_t calibrate_store(struct device *dev,
 672			       struct device_attribute *attr,
 673			       const char *buf, size_t count)
 674{
 675	struct i2c_client *client = to_i2c_client(dev);
 676	struct elan_tp_data *data = i2c_get_clientdata(client);
 677	int tries = 20;
 678	int retval;
 679	int error;
 680	u8 val[ETP_CALIBRATE_MAX_LEN];
 681
 682	retval = mutex_lock_interruptible(&data->sysfs_mutex);
 683	if (retval)
 684		return retval;
 685
 686	disable_irq(client->irq);
 687
 688	data->mode |= ETP_ENABLE_CALIBRATE;
 689	retval = data->ops->set_mode(client, data->mode);
 690	if (retval) {
 691		dev_err(dev, "failed to enable calibration mode: %d\n",
 692			retval);
 693		goto out;
 694	}
 695
 696	retval = data->ops->calibrate(client);
 697	if (retval) {
 698		dev_err(dev, "failed to start calibration: %d\n",
 699			retval);
 700		goto out_disable_calibrate;
 701	}
 702
 703	val[0] = 0xff;
 704	do {
 705		/* Wait 250ms before checking if calibration has completed. */
 706		msleep(250);
 707
 708		retval = data->ops->calibrate_result(client, val);
 709		if (retval)
 710			dev_err(dev, "failed to check calibration result: %d\n",
 711				retval);
 712		else if (val[0] == 0)
 713			break; /* calibration done */
 714
 715	} while (--tries);
 716
 717	if (tries == 0) {
 718		dev_err(dev, "failed to calibrate. Timeout.\n");
 719		retval = -ETIMEDOUT;
 720	}
 721
 722out_disable_calibrate:
 723	data->mode &= ~ETP_ENABLE_CALIBRATE;
 724	error = data->ops->set_mode(data->client, data->mode);
 725	if (error) {
 726		dev_err(dev, "failed to disable calibration mode: %d\n",
 727			error);
 728		if (!retval)
 729			retval = error;
 730	}
 731out:
 732	enable_irq(client->irq);
 733	mutex_unlock(&data->sysfs_mutex);
 734	return retval ?: count;
 735}
 736
 737static ssize_t elan_sysfs_read_mode(struct device *dev,
 738				    struct device_attribute *attr,
 739				    char *buf)
 740{
 741	struct i2c_client *client = to_i2c_client(dev);
 742	struct elan_tp_data *data = i2c_get_clientdata(client);
 743	int error;
 744	enum tp_mode mode;
 745
 746	error = mutex_lock_interruptible(&data->sysfs_mutex);
 747	if (error)
 748		return error;
 749
 750	error = data->ops->iap_get_mode(data->client, &mode);
 751
 752	mutex_unlock(&data->sysfs_mutex);
 753
 754	if (error)
 755		return error;
 756
 757	return sprintf(buf, "%d\n", (int)mode);
 758}
 759
 760static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL);
 761static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL);
 762static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL);
 763static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL);
 764static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL);
 765static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL);
 766static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw);
 767
 768static DEVICE_ATTR_WO(calibrate);
 769
 770static struct attribute *elan_sysfs_entries[] = {
 771	&dev_attr_product_id.attr,
 772	&dev_attr_firmware_version.attr,
 773	&dev_attr_sample_version.attr,
 774	&dev_attr_iap_version.attr,
 775	&dev_attr_fw_checksum.attr,
 776	&dev_attr_calibrate.attr,
 777	&dev_attr_mode.attr,
 778	&dev_attr_update_fw.attr,
 779	NULL,
 780};
 781
 782static const struct attribute_group elan_sysfs_group = {
 783	.attrs = elan_sysfs_entries,
 784};
 785
 786static ssize_t acquire_store(struct device *dev, struct device_attribute *attr,
 787			     const char *buf, size_t count)
 788{
 789	struct i2c_client *client = to_i2c_client(dev);
 790	struct elan_tp_data *data = i2c_get_clientdata(client);
 791	int error;
 792	int retval;
 793
 794	retval = mutex_lock_interruptible(&data->sysfs_mutex);
 795	if (retval)
 796		return retval;
 797
 798	disable_irq(client->irq);
 799
 800	data->baseline_ready = false;
 801
 802	data->mode |= ETP_ENABLE_CALIBRATE;
 803	retval = data->ops->set_mode(data->client, data->mode);
 804	if (retval) {
 805		dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n",
 806			retval);
 807		goto out;
 808	}
 809
 810	msleep(250);
 811
 812	retval = data->ops->get_baseline_data(data->client, true,
 813					      &data->max_baseline);
 814	if (retval) {
 815		dev_err(dev, "Failed to read max baseline form device: %d\n",
 816			retval);
 817		goto out_disable_calibrate;
 818	}
 819
 820	retval = data->ops->get_baseline_data(data->client, false,
 821					      &data->min_baseline);
 822	if (retval) {
 823		dev_err(dev, "Failed to read min baseline form device: %d\n",
 824			retval);
 825		goto out_disable_calibrate;
 826	}
 827
 828	data->baseline_ready = true;
 829
 830out_disable_calibrate:
 831	data->mode &= ~ETP_ENABLE_CALIBRATE;
 832	error = data->ops->set_mode(data->client, data->mode);
 833	if (error) {
 834		dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n",
 835			error);
 836		if (!retval)
 837			retval = error;
 838	}
 839out:
 840	enable_irq(client->irq);
 841	mutex_unlock(&data->sysfs_mutex);
 842	return retval ?: count;
 843}
 844
 845static ssize_t min_show(struct device *dev,
 846			struct device_attribute *attr, char *buf)
 847{
 848	struct i2c_client *client = to_i2c_client(dev);
 849	struct elan_tp_data *data = i2c_get_clientdata(client);
 850	int retval;
 851
 852	retval = mutex_lock_interruptible(&data->sysfs_mutex);
 853	if (retval)
 854		return retval;
 855
 856	if (!data->baseline_ready) {
 857		retval = -ENODATA;
 858		goto out;
 859	}
 860
 861	retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline);
 862
 863out:
 864	mutex_unlock(&data->sysfs_mutex);
 865	return retval;
 866}
 867
 868static ssize_t max_show(struct device *dev,
 869			struct device_attribute *attr, char *buf)
 870{
 871	struct i2c_client *client = to_i2c_client(dev);
 872	struct elan_tp_data *data = i2c_get_clientdata(client);
 873	int retval;
 874
 875	retval = mutex_lock_interruptible(&data->sysfs_mutex);
 876	if (retval)
 877		return retval;
 878
 879	if (!data->baseline_ready) {
 880		retval = -ENODATA;
 881		goto out;
 882	}
 883
 884	retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline);
 885
 886out:
 887	mutex_unlock(&data->sysfs_mutex);
 888	return retval;
 889}
 890
 891
 892static DEVICE_ATTR_WO(acquire);
 893static DEVICE_ATTR_RO(min);
 894static DEVICE_ATTR_RO(max);
 895
 896static struct attribute *elan_baseline_sysfs_entries[] = {
 897	&dev_attr_acquire.attr,
 898	&dev_attr_min.attr,
 899	&dev_attr_max.attr,
 900	NULL,
 901};
 902
 903static const struct attribute_group elan_baseline_sysfs_group = {
 904	.name = "baseline",
 905	.attrs = elan_baseline_sysfs_entries,
 906};
 907
 908static const struct attribute_group *elan_sysfs_groups[] = {
 909	&elan_sysfs_group,
 910	&elan_baseline_sysfs_group,
 911	NULL
 912};
 913
 914/*
 915 ******************************************************************
 916 * Elan isr functions
 917 ******************************************************************
 918 */
 919static void elan_report_contact(struct elan_tp_data *data, int contact_num,
 920				bool contact_valid, bool high_precision,
 921				u8 *packet, u8 *finger_data)
 922{
 923	struct input_dev *input = data->input;
 924	unsigned int pos_x, pos_y;
 925	unsigned int pressure, scaled_pressure;
 926
 927	if (contact_valid) {
 928		if (high_precision) {
 929			pos_x = get_unaligned_be16(&finger_data[0]);
 930			pos_y = get_unaligned_be16(&finger_data[2]);
 931		} else {
 932			pos_x = ((finger_data[0] & 0xf0) << 4) | finger_data[1];
 933			pos_y = ((finger_data[0] & 0x0f) << 8) | finger_data[2];
 934		}
 935
 936		if (pos_x > data->max_x || pos_y > data->max_y) {
 937			dev_dbg(input->dev.parent,
 938				"[%d] x=%d y=%d over max (%d, %d)",
 939				contact_num, pos_x, pos_y,
 940				data->max_x, data->max_y);
 941			return;
 942		}
 943
 944		pressure = finger_data[4];
 945		scaled_pressure = pressure + data->pressure_adjustment;
 946		if (scaled_pressure > ETP_MAX_PRESSURE)
 947			scaled_pressure = ETP_MAX_PRESSURE;
 948
 949		input_mt_slot(input, contact_num);
 950		input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
 951		input_report_abs(input, ABS_MT_POSITION_X, pos_x);
 952		input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y);
 953		input_report_abs(input, ABS_MT_PRESSURE, scaled_pressure);
 954
 955		if (data->report_features & ETP_FEATURE_REPORT_MK) {
 956			unsigned int mk_x, mk_y, area_x, area_y;
 957			u8 mk_data = high_precision ?
 958				packet[ETP_MK_DATA_OFFSET + contact_num] :
 959				finger_data[3];
 960
 961			mk_x = mk_data & 0x0f;
 962			mk_y = mk_data >> 4;
 963
 964			/*
 965			 * To avoid treating large finger as palm, let's reduce
 966			 * the width x and y per trace.
 967			 */
 968			area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE);
 969			area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE);
 970
 971			input_report_abs(input, ABS_TOOL_WIDTH, mk_x);
 972			input_report_abs(input, ABS_MT_TOUCH_MAJOR,
 973					 max(area_x, area_y));
 974			input_report_abs(input, ABS_MT_TOUCH_MINOR,
 975					 min(area_x, area_y));
 976		}
 977	} else {
 978		input_mt_slot(input, contact_num);
 979		input_mt_report_slot_inactive(input);
 980	}
 981}
 982
 983static void elan_report_absolute(struct elan_tp_data *data, u8 *packet,
 984				 bool high_precision)
 985{
 986	struct input_dev *input = data->input;
 987	u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET];
 988	int i;
 989	u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET];
 990	u8 hover_info = packet[ETP_HOVER_INFO_OFFSET];
 991	bool contact_valid, hover_event;
 992
 993	pm_wakeup_event(&data->client->dev, 0);
 994
 995	hover_event = hover_info & BIT(6);
 996
 997	for (i = 0; i < ETP_MAX_FINGERS; i++) {
 998		contact_valid = tp_info & BIT(3 + i);
 999		elan_report_contact(data, i, contact_valid, high_precision,
1000				    packet, finger_data);
1001		if (contact_valid)
1002			finger_data += ETP_FINGER_DATA_LEN;
1003	}
1004
1005	input_report_key(input, BTN_LEFT,   tp_info & BIT(0));
1006	input_report_key(input, BTN_MIDDLE, tp_info & BIT(2));
1007	input_report_key(input, BTN_RIGHT,  tp_info & BIT(1));
1008	input_report_abs(input, ABS_DISTANCE, hover_event != 0);
1009	input_mt_report_pointer_emulation(input, true);
1010	input_sync(input);
1011}
1012
1013static void elan_report_trackpoint(struct elan_tp_data *data, u8 *report)
1014{
1015	struct input_dev *input = data->tp_input;
1016	u8 *packet = &report[ETP_REPORT_ID_OFFSET + 1];
1017	int x, y;
1018
1019	pm_wakeup_event(&data->client->dev, 0);
1020
1021	if (!data->tp_input) {
1022		dev_warn_once(&data->client->dev,
1023			      "received a trackpoint report while no trackpoint device has been created. Please report upstream.\n");
1024		return;
1025	}
1026
1027	input_report_key(input, BTN_LEFT, packet[0] & 0x01);
1028	input_report_key(input, BTN_RIGHT, packet[0] & 0x02);
1029	input_report_key(input, BTN_MIDDLE, packet[0] & 0x04);
1030
1031	if ((packet[3] & 0x0F) == 0x06) {
1032		x = packet[4] - (int)((packet[1] ^ 0x80) << 1);
1033		y = (int)((packet[2] ^ 0x80) << 1) - packet[5];
1034
1035		input_report_rel(input, REL_X, x);
1036		input_report_rel(input, REL_Y, y);
1037	}
1038
1039	input_sync(input);
1040}
1041
1042static irqreturn_t elan_isr(int irq, void *dev_id)
1043{
1044	struct elan_tp_data *data = dev_id;
1045	int error;
1046	u8 report[ETP_MAX_REPORT_LEN];
1047
1048	/*
1049	 * When device is connected to i2c bus, when all IAP page writes
1050	 * complete, the driver will receive interrupt and must read
1051	 * 0000 to confirm that IAP is finished.
1052	*/
1053	if (data->in_fw_update) {
1054		complete(&data->fw_completion);
1055		goto out;
1056	}
1057
1058	error = data->ops->get_report(data->client, report, data->report_len);
1059	if (error)
1060		goto out;
1061
1062	switch (report[ETP_REPORT_ID_OFFSET]) {
1063	case ETP_REPORT_ID:
1064		elan_report_absolute(data, report, false);
1065		break;
1066	case ETP_REPORT_ID2:
1067		elan_report_absolute(data, report, true);
1068		break;
1069	case ETP_TP_REPORT_ID:
1070	case ETP_TP_REPORT_ID2:
1071		elan_report_trackpoint(data, report);
1072		break;
1073	default:
1074		dev_err(&data->client->dev, "invalid report id data (%x)\n",
1075			report[ETP_REPORT_ID_OFFSET]);
1076	}
1077
1078out:
1079	return IRQ_HANDLED;
1080}
1081
1082/*
1083 ******************************************************************
1084 * Elan initialization functions
1085 ******************************************************************
1086 */
1087
1088static int elan_setup_trackpoint_input_device(struct elan_tp_data *data)
1089{
1090	struct device *dev = &data->client->dev;
1091	struct input_dev *input;
1092
1093	input = devm_input_allocate_device(dev);
1094	if (!input)
1095		return -ENOMEM;
1096
1097	input->name = "Elan TrackPoint";
1098	input->id.bustype = BUS_I2C;
1099	input->id.vendor = ELAN_VENDOR_ID;
1100	input->id.product = data->product_id;
1101	input_set_drvdata(input, data);
1102
1103	input_set_capability(input, EV_REL, REL_X);
1104	input_set_capability(input, EV_REL, REL_Y);
1105	input_set_capability(input, EV_KEY, BTN_LEFT);
1106	input_set_capability(input, EV_KEY, BTN_RIGHT);
1107	input_set_capability(input, EV_KEY, BTN_MIDDLE);
1108
1109	__set_bit(INPUT_PROP_POINTER, input->propbit);
1110	__set_bit(INPUT_PROP_POINTING_STICK, input->propbit);
1111
1112	data->tp_input = input;
1113
1114	return 0;
1115}
1116
1117static int elan_setup_input_device(struct elan_tp_data *data)
1118{
1119	struct device *dev = &data->client->dev;
1120	struct input_dev *input;
1121	unsigned int max_width = max(data->width_x, data->width_y);
1122	unsigned int min_width = min(data->width_x, data->width_y);
1123	int error;
1124
1125	input = devm_input_allocate_device(dev);
1126	if (!input)
1127		return -ENOMEM;
1128
1129	input->name = "Elan Touchpad";
1130	input->id.bustype = BUS_I2C;
1131	input->id.vendor = ELAN_VENDOR_ID;
1132	input->id.product = data->product_id;
1133	input_set_drvdata(input, data);
1134
1135	error = input_mt_init_slots(input, ETP_MAX_FINGERS,
1136				    INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED);
1137	if (error) {
1138		dev_err(dev, "failed to initialize MT slots: %d\n", error);
1139		return error;
1140	}
1141
1142	__set_bit(EV_ABS, input->evbit);
1143	__set_bit(INPUT_PROP_POINTER, input->propbit);
1144	if (data->clickpad) {
1145		__set_bit(INPUT_PROP_BUTTONPAD, input->propbit);
1146	} else {
1147		__set_bit(BTN_RIGHT, input->keybit);
1148		if (data->middle_button)
1149			__set_bit(BTN_MIDDLE, input->keybit);
1150	}
1151	__set_bit(BTN_LEFT, input->keybit);
1152
1153	/* Set up ST parameters */
1154	input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0);
1155	input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0);
1156	input_abs_set_res(input, ABS_X, data->x_res);
1157	input_abs_set_res(input, ABS_Y, data->y_res);
1158	input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0);
1159	if (data->report_features & ETP_FEATURE_REPORT_MK)
1160		input_set_abs_params(input, ABS_TOOL_WIDTH,
1161				     0, ETP_FINGER_WIDTH, 0, 0);
1162	input_set_abs_params(input, ABS_DISTANCE, 0, 1, 0, 0);
1163
1164	/* And MT parameters */
1165	input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0);
1166	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0);
1167	input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res);
1168	input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res);
1169	input_set_abs_params(input, ABS_MT_PRESSURE, 0,
1170			     ETP_MAX_PRESSURE, 0, 0);
1171	if (data->report_features & ETP_FEATURE_REPORT_MK) {
1172		input_set_abs_params(input, ABS_MT_TOUCH_MAJOR,
1173				     0, ETP_FINGER_WIDTH * max_width, 0, 0);
1174		input_set_abs_params(input, ABS_MT_TOUCH_MINOR,
1175				     0, ETP_FINGER_WIDTH * min_width, 0, 0);
1176	}
1177
1178	data->input = input;
1179
1180	return 0;
1181}
1182
1183static void elan_disable_regulator(void *_data)
1184{
1185	struct elan_tp_data *data = _data;
1186
1187	regulator_disable(data->vcc);
1188}
1189
1190static int elan_probe(struct i2c_client *client)
1191{
1192	const struct elan_transport_ops *transport_ops;
1193	struct device *dev = &client->dev;
1194	struct elan_tp_data *data;
1195	unsigned long irqflags;
1196	int error;
1197
1198	if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) &&
1199	    i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
1200		transport_ops = &elan_i2c_ops;
1201	} else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) &&
1202		   i2c_check_functionality(client->adapter,
1203					   I2C_FUNC_SMBUS_BYTE_DATA |
1204						I2C_FUNC_SMBUS_BLOCK_DATA |
1205						I2C_FUNC_SMBUS_I2C_BLOCK)) {
1206		transport_ops = &elan_smbus_ops;
1207	} else {
1208		dev_err(dev, "not a supported I2C/SMBus adapter\n");
1209		return -EIO;
1210	}
1211
1212	data = devm_kzalloc(dev, sizeof(struct elan_tp_data), GFP_KERNEL);
1213	if (!data)
1214		return -ENOMEM;
1215
1216	i2c_set_clientdata(client, data);
1217
1218	data->ops = transport_ops;
1219	data->client = client;
1220	init_completion(&data->fw_completion);
1221	mutex_init(&data->sysfs_mutex);
1222
1223	data->vcc = devm_regulator_get(dev, "vcc");
1224	if (IS_ERR(data->vcc)) {
1225		error = PTR_ERR(data->vcc);
1226		if (error != -EPROBE_DEFER)
1227			dev_err(dev, "Failed to get 'vcc' regulator: %d\n",
1228				error);
1229		return error;
1230	}
1231
1232	error = regulator_enable(data->vcc);
1233	if (error) {
1234		dev_err(dev, "Failed to enable regulator: %d\n", error);
1235		return error;
1236	}
1237
1238	error = devm_add_action_or_reset(dev, elan_disable_regulator, data);
1239	if (error) {
1240		dev_err(dev, "Failed to add disable regulator action: %d\n",
1241			error);
1242		return error;
1243	}
1244
1245	/* Make sure there is something at this address */
1246	error = i2c_smbus_read_byte(client);
1247	if (error < 0) {
1248		dev_dbg(&client->dev, "nothing at this address: %d\n", error);
1249		return -ENXIO;
1250	}
1251
1252	/* Initialize the touchpad. */
1253	error = elan_initialize(data, false);
1254	if (error)
1255		return error;
1256
1257	error = elan_query_device_info(data);
1258	if (error)
1259		return error;
1260
1261	error = elan_query_device_parameters(data);
1262	if (error)
1263		return error;
1264
1265	dev_info(dev,
1266		 "Elan Touchpad: Module ID: 0x%04x, Firmware: 0x%04x, Sample: 0x%04x, IAP: 0x%04x\n",
1267		 data->product_id,
1268		 data->fw_version,
1269		 data->sm_version,
1270		 data->iap_version);
1271
1272	dev_dbg(dev,
1273		"Elan Touchpad Extra Information:\n"
1274		"    Max ABS X,Y:   %d,%d\n"
1275		"    Width X,Y:   %d,%d\n"
1276		"    Resolution X,Y:   %d,%d (dots/mm)\n"
1277		"    ic type: 0x%x\n"
1278		"    info pattern: 0x%x\n",
1279		data->max_x, data->max_y,
1280		data->width_x, data->width_y,
1281		data->x_res, data->y_res,
1282		data->ic_type, data->pattern);
1283
1284	/* Set up input device properties based on queried parameters. */
1285	error = elan_setup_input_device(data);
1286	if (error)
1287		return error;
1288
1289	if (device_property_read_bool(&client->dev, "elan,trackpoint")) {
1290		error = elan_setup_trackpoint_input_device(data);
1291		if (error)
1292			return error;
1293	}
1294
1295	/*
1296	 * Platform code (ACPI, DTS) should normally set up interrupt
1297	 * for us, but in case it did not let's fall back to using falling
1298	 * edge to be compatible with older Chromebooks.
1299	 */
1300	irqflags = irq_get_trigger_type(client->irq);
1301	if (!irqflags)
1302		irqflags = IRQF_TRIGGER_FALLING;
1303
1304	error = devm_request_threaded_irq(dev, client->irq, NULL, elan_isr,
1305					  irqflags | IRQF_ONESHOT,
1306					  client->name, data);
1307	if (error) {
1308		dev_err(dev, "cannot register irq=%d\n", client->irq);
1309		return error;
1310	}
1311
1312	error = input_register_device(data->input);
1313	if (error) {
1314		dev_err(dev, "failed to register input device: %d\n", error);
1315		return error;
1316	}
1317
1318	if (data->tp_input) {
1319		error = input_register_device(data->tp_input);
1320		if (error) {
1321			dev_err(&client->dev,
1322				"failed to register TrackPoint input device: %d\n",
1323				error);
1324			return error;
1325		}
1326	}
1327
1328	return 0;
1329}
1330
1331static int __maybe_unused elan_suspend(struct device *dev)
1332{
1333	struct i2c_client *client = to_i2c_client(dev);
1334	struct elan_tp_data *data = i2c_get_clientdata(client);
1335	int ret;
1336
1337	/*
1338	 * We are taking the mutex to make sure sysfs operations are
1339	 * complete before we attempt to bring the device into low[er]
1340	 * power mode.
1341	 */
1342	ret = mutex_lock_interruptible(&data->sysfs_mutex);
1343	if (ret)
1344		return ret;
1345
1346	disable_irq(client->irq);
1347
1348	if (device_may_wakeup(dev)) {
1349		ret = elan_sleep(data);
1350	} else {
1351		ret = elan_set_power(data, false);
1352		if (ret)
1353			goto err;
1354
1355		ret = regulator_disable(data->vcc);
1356		if (ret) {
1357			dev_err(dev, "error %d disabling regulator\n", ret);
1358			/* Attempt to power the chip back up */
1359			elan_set_power(data, true);
1360		}
1361	}
1362
1363err:
1364	mutex_unlock(&data->sysfs_mutex);
1365	return ret;
1366}
1367
1368static int __maybe_unused elan_resume(struct device *dev)
1369{
1370	struct i2c_client *client = to_i2c_client(dev);
1371	struct elan_tp_data *data = i2c_get_clientdata(client);
1372	int error;
1373
1374	if (!device_may_wakeup(dev)) {
1375		error = regulator_enable(data->vcc);
1376		if (error) {
1377			dev_err(dev, "error %d enabling regulator\n", error);
1378			goto err;
1379		}
1380	}
1381
1382	error = elan_set_power(data, true);
1383	if (error) {
1384		dev_err(dev, "power up when resuming failed: %d\n", error);
1385		goto err;
1386	}
1387
1388	error = elan_initialize(data, data->quirks & ETP_QUIRK_QUICK_WAKEUP);
1389	if (error)
1390		dev_err(dev, "initialize when resuming failed: %d\n", error);
1391
1392err:
1393	enable_irq(data->client->irq);
1394	return error;
1395}
1396
1397static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume);
1398
1399static const struct i2c_device_id elan_id[] = {
1400	{ DRIVER_NAME, 0 },
1401	{ },
1402};
1403MODULE_DEVICE_TABLE(i2c, elan_id);
1404
1405#ifdef CONFIG_ACPI
1406#include <linux/input/elan-i2c-ids.h>
1407MODULE_DEVICE_TABLE(acpi, elan_acpi_id);
1408#endif
1409
1410#ifdef CONFIG_OF
1411static const struct of_device_id elan_of_match[] = {
1412	{ .compatible = "elan,ekth3000" },
1413	{ /* sentinel */ }
1414};
1415MODULE_DEVICE_TABLE(of, elan_of_match);
1416#endif
1417
1418static struct i2c_driver elan_driver = {
1419	.driver = {
1420		.name	= DRIVER_NAME,
1421		.pm	= &elan_pm_ops,
1422		.acpi_match_table = ACPI_PTR(elan_acpi_id),
1423		.of_match_table = of_match_ptr(elan_of_match),
1424		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
1425		.dev_groups = elan_sysfs_groups,
1426	},
1427	.probe_new	= elan_probe,
1428	.id_table	= elan_id,
1429};
1430
1431module_i2c_driver(elan_driver);
1432
1433MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>");
1434MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver");
1435MODULE_LICENSE("GPL");