1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Atmel maXTouch Touchscreen driver
   4 *
   5 * Copyright (C) 2010 Samsung Electronics Co.Ltd
   6 * Copyright (C) 2011-2014 Atmel Corporation
   7 * Copyright (C) 2012 Google, Inc.
   8 * Copyright (C) 2016 Zodiac Inflight Innovations
   9 *
  10 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
  11 */
  12
  13#include <linux/acpi.h>
  14#include <linux/dmi.h>
  15#include <linux/module.h>
  16#include <linux/init.h>
  17#include <linux/completion.h>
  18#include <linux/delay.h>
  19#include <linux/firmware.h>
  20#include <linux/i2c.h>
  21#include <linux/input/mt.h>
  22#include <linux/interrupt.h>
  23#include <linux/irq.h>
  24#include <linux/of.h>
  25#include <linux/property.h>
  26#include <linux/slab.h>
  27#include <linux/regulator/consumer.h>
  28#include <linux/gpio/consumer.h>
  29#include <linux/unaligned.h>
  30#include <media/v4l2-device.h>
  31#include <media/v4l2-ioctl.h>
  32#include <media/videobuf2-v4l2.h>
  33#include <media/videobuf2-vmalloc.h>
  34#include <dt-bindings/input/atmel-maxtouch.h>
  35
  36/* Firmware files */
  37#define MXT_FW_NAME		"maxtouch.fw"
  38#define MXT_CFG_NAME		"maxtouch.cfg"
  39#define MXT_CFG_MAGIC		"OBP_RAW V1"
  40
  41/* Registers */
  42#define MXT_OBJECT_START	0x07
  43#define MXT_OBJECT_SIZE		6
  44#define MXT_INFO_CHECKSUM_SIZE	3
  45#define MXT_MAX_BLOCK_WRITE	256
  46
  47/* Object types */
  48#define MXT_DEBUG_DIAGNOSTIC_T37	37
  49#define MXT_GEN_MESSAGE_T5		5
  50#define MXT_GEN_COMMAND_T6		6
  51#define MXT_GEN_POWER_T7		7
  52#define MXT_GEN_ACQUIRE_T8		8
  53#define MXT_GEN_DATASOURCE_T53		53
  54#define MXT_TOUCH_MULTI_T9		9
  55#define MXT_TOUCH_KEYARRAY_T15		15
  56#define MXT_TOUCH_PROXIMITY_T23		23
  57#define MXT_TOUCH_PROXKEY_T52		52
  58#define MXT_TOUCH_PTC_KEYS_T97		97
  59#define MXT_PROCI_GRIPFACE_T20		20
  60#define MXT_PROCG_NOISE_T22		22
  61#define MXT_PROCI_ONETOUCH_T24		24
  62#define MXT_PROCI_TWOTOUCH_T27		27
  63#define MXT_PROCI_GRIP_T40		40
  64#define MXT_PROCI_PALM_T41		41
  65#define MXT_PROCI_TOUCHSUPPRESSION_T42	42
  66#define MXT_PROCI_STYLUS_T47		47
  67#define MXT_PROCG_NOISESUPPRESSION_T48	48
  68#define MXT_SPT_COMMSCONFIG_T18		18
  69#define MXT_SPT_GPIOPWM_T19		19
  70#define MXT_SPT_SELFTEST_T25		25
  71#define MXT_SPT_CTECONFIG_T28		28
  72#define MXT_SPT_USERDATA_T38		38
  73#define MXT_SPT_DIGITIZER_T43		43
  74#define MXT_SPT_MESSAGECOUNT_T44	44
  75#define MXT_SPT_CTECONFIG_T46		46
  76#define MXT_SPT_DYNAMICCONFIGURATIONCONTAINER_T71 71
  77#define MXT_TOUCH_MULTITOUCHSCREEN_T100 100
  78
  79/* MXT_GEN_MESSAGE_T5 object */
  80#define MXT_RPTID_NOMSG		0xff
  81
  82/* MXT_GEN_COMMAND_T6 field */
  83#define MXT_COMMAND_RESET	0
  84#define MXT_COMMAND_BACKUPNV	1
  85#define MXT_COMMAND_CALIBRATE	2
  86#define MXT_COMMAND_REPORTALL	3
  87#define MXT_COMMAND_DIAGNOSTIC	5
  88
  89/* Define for T6 status byte */
  90#define MXT_T6_STATUS_RESET	BIT(7)
  91#define MXT_T6_STATUS_OFL	BIT(6)
  92#define MXT_T6_STATUS_SIGERR	BIT(5)
  93#define MXT_T6_STATUS_CAL	BIT(4)
  94#define MXT_T6_STATUS_CFGERR	BIT(3)
  95#define MXT_T6_STATUS_COMSERR	BIT(2)
  96
  97/* MXT_GEN_POWER_T7 field */
  98struct t7_config {
  99	u8 idle;
 100	u8 active;
 101} __packed;
 102
 103#define MXT_POWER_CFG_RUN		0
 104#define MXT_POWER_CFG_DEEPSLEEP		1
 105
 106/* MXT_TOUCH_MULTI_T9 field */
 107#define MXT_T9_CTRL		0
 108#define MXT_T9_XSIZE		3
 109#define MXT_T9_YSIZE		4
 110#define MXT_T9_ORIENT		9
 111#define MXT_T9_RANGE		18
 112
 113/* MXT_TOUCH_MULTI_T9 status */
 114#define MXT_T9_UNGRIP		BIT(0)
 115#define MXT_T9_SUPPRESS		BIT(1)
 116#define MXT_T9_AMP		BIT(2)
 117#define MXT_T9_VECTOR		BIT(3)
 118#define MXT_T9_MOVE		BIT(4)
 119#define MXT_T9_RELEASE		BIT(5)
 120#define MXT_T9_PRESS		BIT(6)
 121#define MXT_T9_DETECT		BIT(7)
 122
 123struct t9_range {
 124	__le16 x;
 125	__le16 y;
 126} __packed;
 127
 128/* MXT_TOUCH_MULTI_T9 orient */
 129#define MXT_T9_ORIENT_SWITCH	BIT(0)
 130#define MXT_T9_ORIENT_INVERTX	BIT(1)
 131#define MXT_T9_ORIENT_INVERTY	BIT(2)
 132
 133/* MXT_SPT_COMMSCONFIG_T18 */
 134#define MXT_COMMS_CTRL		0
 135#define MXT_COMMS_CMD		1
 136#define MXT_COMMS_RETRIGEN	BIT(6)
 137
 138/* MXT_DEBUG_DIAGNOSTIC_T37 */
 139#define MXT_DIAGNOSTIC_PAGEUP	0x01
 140#define MXT_DIAGNOSTIC_DELTAS	0x10
 141#define MXT_DIAGNOSTIC_REFS	0x11
 142#define MXT_DIAGNOSTIC_SIZE	128
 143
 144#define MXT_FAMILY_1386			160
 145#define MXT1386_COLUMNS			3
 146#define MXT1386_PAGES_PER_COLUMN	8
 147
 148struct t37_debug {
 149#ifdef CONFIG_TOUCHSCREEN_ATMEL_MXT_T37
 150	u8 mode;
 151	u8 page;
 152	u8 data[MXT_DIAGNOSTIC_SIZE];
 153#endif
 154};
 155
 156/* Define for MXT_GEN_COMMAND_T6 */
 157#define MXT_BOOT_VALUE		0xa5
 158#define MXT_RESET_VALUE		0x01
 159#define MXT_BACKUP_VALUE	0x55
 160
 161/* T100 Multiple Touch Touchscreen */
 162#define MXT_T100_CTRL		0
 163#define MXT_T100_CFG1		1
 164#define MXT_T100_TCHAUX		3
 165#define MXT_T100_XSIZE		9
 166#define MXT_T100_XRANGE		13
 167#define MXT_T100_YSIZE		20
 168#define MXT_T100_YRANGE		24
 169
 170#define MXT_T100_CFG_SWITCHXY	BIT(5)
 171#define MXT_T100_CFG_INVERTY	BIT(6)
 172#define MXT_T100_CFG_INVERTX	BIT(7)
 173
 174#define MXT_T100_TCHAUX_VECT	BIT(0)
 175#define MXT_T100_TCHAUX_AMPL	BIT(1)
 176#define MXT_T100_TCHAUX_AREA	BIT(2)
 177
 178#define MXT_T100_DETECT		BIT(7)
 179#define MXT_T100_TYPE_MASK	0x70
 180
 181enum t100_type {
 182	MXT_T100_TYPE_FINGER		= 1,
 183	MXT_T100_TYPE_PASSIVE_STYLUS	= 2,
 184	MXT_T100_TYPE_HOVERING_FINGER	= 4,
 185	MXT_T100_TYPE_GLOVE		= 5,
 186	MXT_T100_TYPE_LARGE_TOUCH	= 6,
 187};
 188
 189#define MXT_DISTANCE_ACTIVE_TOUCH	0
 190#define MXT_DISTANCE_HOVERING		1
 191
 192#define MXT_TOUCH_MAJOR_DEFAULT		1
 193#define MXT_PRESSURE_DEFAULT		1
 194
 195/* Delay times */
 196#define MXT_BACKUP_TIME		50	/* msec */
 197#define MXT_RESET_GPIO_TIME	20	/* msec */
 198#define MXT_RESET_INVALID_CHG	100	/* msec */
 199#define MXT_RESET_TIME		200	/* msec */
 200#define MXT_RESET_TIMEOUT	3000	/* msec */
 201#define MXT_CRC_TIMEOUT		1000	/* msec */
 202#define MXT_FW_RESET_TIME	3000	/* msec */
 203#define MXT_FW_CHG_TIMEOUT	300	/* msec */
 204#define MXT_WAKEUP_TIME		25	/* msec */
 205
 206/* Command to unlock bootloader */
 207#define MXT_UNLOCK_CMD_MSB	0xaa
 208#define MXT_UNLOCK_CMD_LSB	0xdc
 209
 210/* Bootloader mode status */
 211#define MXT_WAITING_BOOTLOAD_CMD	0xc0	/* valid 7 6 bit only */
 212#define MXT_WAITING_FRAME_DATA	0x80	/* valid 7 6 bit only */
 213#define MXT_FRAME_CRC_CHECK	0x02
 214#define MXT_FRAME_CRC_FAIL	0x03
 215#define MXT_FRAME_CRC_PASS	0x04
 216#define MXT_APP_CRC_FAIL	0x40	/* valid 7 8 bit only */
 217#define MXT_BOOT_STATUS_MASK	0x3f
 218#define MXT_BOOT_EXTENDED_ID	BIT(5)
 219#define MXT_BOOT_ID_MASK	0x1f
 220
 221/* Touchscreen absolute values */
 222#define MXT_MAX_AREA		0xff
 223
 224#define MXT_PIXELS_PER_MM	20
 225
 226struct mxt_info {
 227	u8 family_id;
 228	u8 variant_id;
 229	u8 version;
 230	u8 build;
 231	u8 matrix_xsize;
 232	u8 matrix_ysize;
 233	u8 object_num;
 234};
 235
 236struct mxt_object {
 237	u8 type;
 238	u16 start_address;
 239	u8 size_minus_one;
 240	u8 instances_minus_one;
 241	u8 num_report_ids;
 242} __packed;
 243
 244struct mxt_dbg {
 245	u16 t37_address;
 246	u16 diag_cmd_address;
 247	struct t37_debug *t37_buf;
 248	unsigned int t37_pages;
 249	unsigned int t37_nodes;
 250
 251	struct v4l2_device v4l2;
 252	struct v4l2_pix_format format;
 253	struct video_device vdev;
 254	struct vb2_queue queue;
 255	struct mutex lock;
 256	int input;
 257};
 258
 259enum v4l_dbg_inputs {
 260	MXT_V4L_INPUT_DELTAS,
 261	MXT_V4L_INPUT_REFS,
 262	MXT_V4L_INPUT_MAX,
 263};
 264
 265enum mxt_suspend_mode {
 266	MXT_SUSPEND_DEEP_SLEEP	= 0,
 267	MXT_SUSPEND_T9_CTRL	= 1,
 268};
 269
 270/* Config update context */
 271struct mxt_cfg {
 272	u8 *raw;
 273	size_t raw_size;
 274	off_t raw_pos;
 275
 276	u8 *mem;
 277	size_t mem_size;
 278	int start_ofs;
 279
 280	struct mxt_info info;
 281};
 282
 283/* Each client has this additional data */
 284struct mxt_data {
 285	struct i2c_client *client;
 286	struct input_dev *input_dev;
 287	char phys[64];		/* device physical location */
 288	struct mxt_object *object_table;
 289	struct mxt_info *info;
 290	void *raw_info_block;
 291	unsigned int irq;
 292	unsigned int max_x;
 293	unsigned int max_y;
 294	bool invertx;
 295	bool inverty;
 296	bool xy_switch;
 297	u8 xsize;
 298	u8 ysize;
 299	bool in_bootloader;
 300	u16 mem_size;
 301	u8 t100_aux_ampl;
 302	u8 t100_aux_area;
 303	u8 t100_aux_vect;
 304	u8 max_reportid;
 305	u32 config_crc;
 306	u32 info_crc;
 307	u8 bootloader_addr;
 308	u8 *msg_buf;
 309	u8 t6_status;
 310	bool update_input;
 311	u8 last_message_count;
 312	u8 num_touchids;
 313	u8 multitouch;
 314	struct t7_config t7_cfg;
 315	struct mxt_dbg dbg;
 316	struct regulator_bulk_data regulators[2];
 317	struct gpio_desc *reset_gpio;
 318	struct gpio_desc *wake_gpio;
 319	bool use_retrigen_workaround;
 320
 321	/* Cached parameters from object table */
 322	u16 T5_address;
 323	u8 T5_msg_size;
 324	u8 T6_reportid;
 325	u16 T6_address;
 326	u16 T7_address;
 327	u16 T71_address;
 328	u8 T9_reportid_min;
 329	u8 T9_reportid_max;
 330	u8 T15_reportid_min;
 331	u8 T15_reportid_max;
 332	u16 T18_address;
 333	u8 T19_reportid;
 334	u16 T44_address;
 335	u8 T97_reportid_min;
 336	u8 T97_reportid_max;
 337	u8 T100_reportid_min;
 338	u8 T100_reportid_max;
 339
 340	/* for fw update in bootloader */
 341	struct completion bl_completion;
 342
 343	/* for reset handling */
 344	struct completion reset_completion;
 345
 346	/* for config update handling */
 347	struct completion crc_completion;
 348
 349	u32 *t19_keymap;
 350	unsigned int t19_num_keys;
 351
 352	u32 *t15_keymap;
 353	unsigned int t15_num_keys;
 354
 355	enum mxt_suspend_mode suspend_mode;
 356
 357	u32 wakeup_method;
 358};
 359
 360struct mxt_vb2_buffer {
 361	struct vb2_buffer	vb;
 362	struct list_head	list;
 363};
 364
 365static size_t mxt_obj_size(const struct mxt_object *obj)
 366{
 367	return obj->size_minus_one + 1;
 368}
 369
 370static size_t mxt_obj_instances(const struct mxt_object *obj)
 371{
 372	return obj->instances_minus_one + 1;
 373}
 374
 375static bool mxt_object_readable(unsigned int type)
 376{
 377	switch (type) {
 378	case MXT_GEN_COMMAND_T6:
 379	case MXT_GEN_POWER_T7:
 380	case MXT_GEN_ACQUIRE_T8:
 381	case MXT_GEN_DATASOURCE_T53:
 382	case MXT_TOUCH_MULTI_T9:
 383	case MXT_TOUCH_KEYARRAY_T15:
 384	case MXT_TOUCH_PROXIMITY_T23:
 385	case MXT_TOUCH_PROXKEY_T52:
 386	case MXT_TOUCH_PTC_KEYS_T97:
 387	case MXT_TOUCH_MULTITOUCHSCREEN_T100:
 388	case MXT_PROCI_GRIPFACE_T20:
 389	case MXT_PROCG_NOISE_T22:
 390	case MXT_PROCI_ONETOUCH_T24:
 391	case MXT_PROCI_TWOTOUCH_T27:
 392	case MXT_PROCI_GRIP_T40:
 393	case MXT_PROCI_PALM_T41:
 394	case MXT_PROCI_TOUCHSUPPRESSION_T42:
 395	case MXT_PROCI_STYLUS_T47:
 396	case MXT_PROCG_NOISESUPPRESSION_T48:
 397	case MXT_SPT_COMMSCONFIG_T18:
 398	case MXT_SPT_GPIOPWM_T19:
 399	case MXT_SPT_SELFTEST_T25:
 400	case MXT_SPT_CTECONFIG_T28:
 401	case MXT_SPT_USERDATA_T38:
 402	case MXT_SPT_DIGITIZER_T43:
 403	case MXT_SPT_CTECONFIG_T46:
 404	case MXT_SPT_DYNAMICCONFIGURATIONCONTAINER_T71:
 405		return true;
 406	default:
 407		return false;
 408	}
 409}
 410
 411static void mxt_dump_message(struct mxt_data *data, u8 *message)
 412{
 413	dev_dbg(&data->client->dev, "message: %*ph\n",
 414		data->T5_msg_size, message);
 415}
 416
 417static int mxt_wait_for_completion(struct mxt_data *data,
 418				   struct completion *comp,
 419				   unsigned int timeout_ms)
 420{
 421	struct device *dev = &data->client->dev;
 422	unsigned long timeout = msecs_to_jiffies(timeout_ms);
 423	long ret;
 424
 425	ret = wait_for_completion_interruptible_timeout(comp, timeout);
 426	if (ret < 0) {
 427		return ret;
 428	} else if (ret == 0) {
 429		dev_err(dev, "Wait for completion timed out.\n");
 430		return -ETIMEDOUT;
 431	}
 432	return 0;
 433}
 434
 435static int mxt_bootloader_read(struct mxt_data *data,
 436			       u8 *val, unsigned int count)
 437{
 438	int ret;
 439	struct i2c_msg msg;
 440
 441	msg.addr = data->bootloader_addr;
 442	msg.flags = data->client->flags & I2C_M_TEN;
 443	msg.flags |= I2C_M_RD;
 444	msg.len = count;
 445	msg.buf = val;
 446
 447	ret = i2c_transfer(data->client->adapter, &msg, 1);
 448	if (ret == 1) {
 449		ret = 0;
 450	} else {
 451		ret = ret < 0 ? ret : -EIO;
 452		dev_err(&data->client->dev, "%s: i2c recv failed (%d)\n",
 453			__func__, ret);
 454	}
 455
 456	return ret;
 457}
 458
 459static int mxt_bootloader_write(struct mxt_data *data,
 460				const u8 * const val, unsigned int count)
 461{
 462	int ret;
 463	struct i2c_msg msg;
 464
 465	msg.addr = data->bootloader_addr;
 466	msg.flags = data->client->flags & I2C_M_TEN;
 467	msg.len = count;
 468	msg.buf = (u8 *)val;
 469
 470	ret = i2c_transfer(data->client->adapter, &msg, 1);
 471	if (ret == 1) {
 472		ret = 0;
 473	} else {
 474		ret = ret < 0 ? ret : -EIO;
 475		dev_err(&data->client->dev, "%s: i2c send failed (%d)\n",
 476			__func__, ret);
 477	}
 478
 479	return ret;
 480}
 481
 482static int mxt_lookup_bootloader_address(struct mxt_data *data, bool retry)
 483{
 484	u8 appmode = data->client->addr;
 485	u8 bootloader;
 486	u8 family_id = data->info ? data->info->family_id : 0;
 487
 488	switch (appmode) {
 489	case 0x4a:
 490	case 0x4b:
 491		/* Chips after 1664S use different scheme */
 492		if (retry || family_id >= 0xa2) {
 493			bootloader = appmode - 0x24;
 494			break;
 495		}
 496		fallthrough;	/* for normal case */
 497	case 0x4c:
 498	case 0x4d:
 499	case 0x5a:
 500	case 0x5b:
 501		bootloader = appmode - 0x26;
 502		break;
 503
 504	default:
 505		dev_err(&data->client->dev,
 506			"Appmode i2c address 0x%02x not found\n",
 507			appmode);
 508		return -EINVAL;
 509	}
 510
 511	data->bootloader_addr = bootloader;
 512	return 0;
 513}
 514
 515static int mxt_probe_bootloader(struct mxt_data *data, bool alt_address)
 516{
 517	struct device *dev = &data->client->dev;
 518	int error;
 519	u8 val;
 520	bool crc_failure;
 521
 522	error = mxt_lookup_bootloader_address(data, alt_address);
 523	if (error)
 524		return error;
 525
 526	error = mxt_bootloader_read(data, &val, 1);
 527	if (error)
 528		return error;
 529
 530	/* Check app crc fail mode */
 531	crc_failure = (val & ~MXT_BOOT_STATUS_MASK) == MXT_APP_CRC_FAIL;
 532
 533	dev_err(dev, "Detected bootloader, status:%02X%s\n",
 534			val, crc_failure ? ", APP_CRC_FAIL" : "");
 535
 536	return 0;
 537}
 538
 539static u8 mxt_get_bootloader_version(struct mxt_data *data, u8 val)
 540{
 541	struct device *dev = &data->client->dev;
 542	u8 buf[3];
 543
 544	if (val & MXT_BOOT_EXTENDED_ID) {
 545		if (mxt_bootloader_read(data, &buf[0], 3) != 0) {
 546			dev_err(dev, "%s: i2c failure\n", __func__);
 547			return val;
 548		}
 549
 550		dev_dbg(dev, "Bootloader ID:%d Version:%d\n", buf[1], buf[2]);
 551
 552		return buf[0];
 553	} else {
 554		dev_dbg(dev, "Bootloader ID:%d\n", val & MXT_BOOT_ID_MASK);
 555
 556		return val;
 557	}
 558}
 559
 560static int mxt_check_bootloader(struct mxt_data *data, unsigned int state,
 561				bool wait)
 562{
 563	struct device *dev = &data->client->dev;
 564	u8 val;
 565	int ret;
 566
 567recheck:
 568	if (wait) {
 569		/*
 570		 * In application update mode, the interrupt
 571		 * line signals state transitions. We must wait for the
 572		 * CHG assertion before reading the status byte.
 573		 * Once the status byte has been read, the line is deasserted.
 574		 */
 575		ret = mxt_wait_for_completion(data, &data->bl_completion,
 576					      MXT_FW_CHG_TIMEOUT);
 577		if (ret) {
 578			/*
 579			 * TODO: handle -ERESTARTSYS better by terminating
 580			 * fw update process before returning to userspace
 581			 * by writing length 0x000 to device (iff we are in
 582			 * WAITING_FRAME_DATA state).
 583			 */
 584			dev_err(dev, "Update wait error %d\n", ret);
 585			return ret;
 586		}
 587	}
 588
 589	ret = mxt_bootloader_read(data, &val, 1);
 590	if (ret)
 591		return ret;
 592
 593	if (state == MXT_WAITING_BOOTLOAD_CMD)
 594		val = mxt_get_bootloader_version(data, val);
 595
 596	switch (state) {
 597	case MXT_WAITING_BOOTLOAD_CMD:
 598	case MXT_WAITING_FRAME_DATA:
 599	case MXT_APP_CRC_FAIL:
 600		val &= ~MXT_BOOT_STATUS_MASK;
 601		break;
 602	case MXT_FRAME_CRC_PASS:
 603		if (val == MXT_FRAME_CRC_CHECK) {
 604			goto recheck;
 605		} else if (val == MXT_FRAME_CRC_FAIL) {
 606			dev_err(dev, "Bootloader CRC fail\n");
 607			return -EINVAL;
 608		}
 609		break;
 610	default:
 611		return -EINVAL;
 612	}
 613
 614	if (val != state) {
 615		dev_err(dev, "Invalid bootloader state %02X != %02X\n",
 616			val, state);
 617		return -EINVAL;
 618	}
 619
 620	return 0;
 621}
 622
 623static int mxt_send_bootloader_cmd(struct mxt_data *data, bool unlock)
 624{
 
 625	u8 buf[2];
 626
 627	if (unlock) {
 628		buf[0] = MXT_UNLOCK_CMD_LSB;
 629		buf[1] = MXT_UNLOCK_CMD_MSB;
 630	} else {
 631		buf[0] = 0x01;
 632		buf[1] = 0x01;
 633	}
 634
 635	return mxt_bootloader_write(data, buf, sizeof(buf));
 636}
 637
 638static bool mxt_wakeup_toggle(struct i2c_client *client,
 639			      bool wake_up, bool in_i2c)
 640{
 641	struct mxt_data *data = i2c_get_clientdata(client);
 642
 643	switch (data->wakeup_method) {
 644	case ATMEL_MXT_WAKEUP_I2C_SCL:
 645		if (!in_i2c)
 646			return false;
 647		break;
 648
 649	case ATMEL_MXT_WAKEUP_GPIO:
 650		if (in_i2c)
 651			return false;
 652
 653		gpiod_set_value(data->wake_gpio, wake_up);
 654		break;
 655
 656	default:
 657		return false;
 658	}
 659
 660	if (wake_up) {
 661		dev_dbg(&client->dev, "waking up controller\n");
 662
 663		msleep(MXT_WAKEUP_TIME);
 664	}
 665
 666	return true;
 667}
 668
 669static int __mxt_read_reg(struct i2c_client *client,
 670			       u16 reg, u16 len, void *val)
 671{
 672	struct i2c_msg xfer[2];
 673	bool retried = false;
 674	u8 buf[2];
 675	int ret;
 676
 677	buf[0] = reg & 0xff;
 678	buf[1] = (reg >> 8) & 0xff;
 679
 680	/* Write register */
 681	xfer[0].addr = client->addr;
 682	xfer[0].flags = 0;
 683	xfer[0].len = 2;
 684	xfer[0].buf = buf;
 685
 686	/* Read data */
 687	xfer[1].addr = client->addr;
 688	xfer[1].flags = I2C_M_RD;
 689	xfer[1].len = len;
 690	xfer[1].buf = val;
 691
 692retry:
 693	ret = i2c_transfer(client->adapter, xfer, 2);
 694	if (ret == 2) {
 695		ret = 0;
 696	} else if (!retried && mxt_wakeup_toggle(client, true, true)) {
 697		retried = true;
 698		goto retry;
 699	} else {
 700		if (ret >= 0)
 701			ret = -EIO;
 702		dev_err(&client->dev, "%s: i2c transfer failed (%d)\n",
 703			__func__, ret);
 704	}
 705
 706	return ret;
 707}
 708
 709static int __mxt_write_reg(struct i2c_client *client, u16 reg, u16 len,
 710			   const void *val)
 711{
 712	bool retried = false;
 713	u8 *buf;
 714	size_t count;
 715	int ret;
 716
 717	count = len + 2;
 718	buf = kmalloc(count, GFP_KERNEL);
 719	if (!buf)
 720		return -ENOMEM;
 721
 722	buf[0] = reg & 0xff;
 723	buf[1] = (reg >> 8) & 0xff;
 724	memcpy(&buf[2], val, len);
 725
 726retry:
 727	ret = i2c_master_send(client, buf, count);
 728	if (ret == count) {
 729		ret = 0;
 730	} else if (!retried && mxt_wakeup_toggle(client, true, true)) {
 731		retried = true;
 732		goto retry;
 733	} else {
 734		if (ret >= 0)
 735			ret = -EIO;
 736		dev_err(&client->dev, "%s: i2c send failed (%d)\n",
 737			__func__, ret);
 738	}
 739
 740	kfree(buf);
 741	return ret;
 742}
 743
 744static int mxt_write_reg(struct i2c_client *client, u16 reg, u8 val)
 745{
 746	return __mxt_write_reg(client, reg, 1, &val);
 747}
 748
 749static struct mxt_object *
 750mxt_get_object(struct mxt_data *data, u8 type)
 751{
 752	struct mxt_object *object;
 753	int i;
 754
 755	for (i = 0; i < data->info->object_num; i++) {
 756		object = data->object_table + i;
 757		if (object->type == type)
 758			return object;
 759	}
 760
 761	dev_warn(&data->client->dev, "Invalid object type T%u\n", type);
 762	return NULL;
 763}
 764
 765static void mxt_proc_t6_messages(struct mxt_data *data, u8 *msg)
 766{
 767	struct device *dev = &data->client->dev;
 768	u8 status = msg[1];
 769	u32 crc = msg[2] | (msg[3] << 8) | (msg[4] << 16);
 770
 771	if (crc != data->config_crc) {
 772		data->config_crc = crc;
 773		dev_dbg(dev, "T6 Config Checksum: 0x%06X\n", crc);
 774	}
 775
 776	complete(&data->crc_completion);
 777
 778	/* Detect reset */
 779	if (status & MXT_T6_STATUS_RESET)
 780		complete(&data->reset_completion);
 781
 782	/* Output debug if status has changed */
 783	if (status != data->t6_status)
 784		dev_dbg(dev, "T6 Status 0x%02X%s%s%s%s%s%s%s\n",
 785			status,
 786			status == 0 ? " OK" : "",
 787			status & MXT_T6_STATUS_RESET ? " RESET" : "",
 788			status & MXT_T6_STATUS_OFL ? " OFL" : "",
 789			status & MXT_T6_STATUS_SIGERR ? " SIGERR" : "",
 790			status & MXT_T6_STATUS_CAL ? " CAL" : "",
 791			status & MXT_T6_STATUS_CFGERR ? " CFGERR" : "",
 792			status & MXT_T6_STATUS_COMSERR ? " COMSERR" : "");
 793
 794	/* Save current status */
 795	data->t6_status = status;
 796}
 797
 798static int mxt_write_object(struct mxt_data *data,
 799				 u8 type, u8 offset, u8 val)
 800{
 801	struct mxt_object *object;
 802	u16 reg;
 803
 804	object = mxt_get_object(data, type);
 805	if (!object || offset >= mxt_obj_size(object))
 806		return -EINVAL;
 807
 808	reg = object->start_address;
 809	return mxt_write_reg(data->client, reg + offset, val);
 810}
 811
 812static void mxt_input_button(struct mxt_data *data, u8 *message)
 813{
 814	struct input_dev *input = data->input_dev;
 815	int i;
 816
 817	for (i = 0; i < data->t19_num_keys; i++) {
 818		if (data->t19_keymap[i] == KEY_RESERVED)
 819			continue;
 820
 821		/* Active-low switch */
 822		input_report_key(input, data->t19_keymap[i],
 823				 !(message[1] & BIT(i)));
 824	}
 825}
 826
 827static void mxt_input_sync(struct mxt_data *data)
 828{
 829	input_mt_report_pointer_emulation(data->input_dev,
 830					  data->t19_num_keys);
 831	input_sync(data->input_dev);
 832}
 833
 834static void mxt_proc_t9_message(struct mxt_data *data, u8 *message)
 835{
 836	struct device *dev = &data->client->dev;
 837	struct input_dev *input_dev = data->input_dev;
 838	int id;
 839	u8 status;
 840	int x;
 841	int y;
 842	int area;
 843	int amplitude;
 844
 845	id = message[0] - data->T9_reportid_min;
 846	status = message[1];
 847	x = (message[2] << 4) | ((message[4] >> 4) & 0xf);
 848	y = (message[3] << 4) | ((message[4] & 0xf));
 849
 850	/* Handle 10/12 bit switching */
 851	if (data->max_x < 1024)
 852		x >>= 2;
 853	if (data->max_y < 1024)
 854		y >>= 2;
 855
 856	area = message[5];
 857	amplitude = message[6];
 858
 859	dev_dbg(dev,
 860		"[%u] %c%c%c%c%c%c%c%c x: %5u y: %5u area: %3u amp: %3u\n",
 861		id,
 862		(status & MXT_T9_DETECT) ? 'D' : '.',
 863		(status & MXT_T9_PRESS) ? 'P' : '.',
 864		(status & MXT_T9_RELEASE) ? 'R' : '.',
 865		(status & MXT_T9_MOVE) ? 'M' : '.',
 866		(status & MXT_T9_VECTOR) ? 'V' : '.',
 867		(status & MXT_T9_AMP) ? 'A' : '.',
 868		(status & MXT_T9_SUPPRESS) ? 'S' : '.',
 869		(status & MXT_T9_UNGRIP) ? 'U' : '.',
 870		x, y, area, amplitude);
 871
 872	input_mt_slot(input_dev, id);
 873
 874	if (status & MXT_T9_DETECT) {
 875		/*
 876		 * Multiple bits may be set if the host is slow to read
 877		 * the status messages, indicating all the events that
 878		 * have happened.
 879		 */
 880		if (status & MXT_T9_RELEASE) {
 881			input_mt_report_slot_inactive(input_dev);
 
 882			mxt_input_sync(data);
 883		}
 884
 885		/* if active, pressure must be non-zero */
 886		if (!amplitude)
 887			amplitude = MXT_PRESSURE_DEFAULT;
 888
 889		/* Touch active */
 890		input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, 1);
 891		input_report_abs(input_dev, ABS_MT_POSITION_X, x);
 892		input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
 893		input_report_abs(input_dev, ABS_MT_PRESSURE, amplitude);
 894		input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, area);
 895	} else {
 896		/* Touch no longer active, close out slot */
 897		input_mt_report_slot_inactive(input_dev);
 898	}
 899
 900	data->update_input = true;
 901}
 902
 903static void mxt_proc_t15_messages(struct mxt_data *data, u8 *message)
 904{
 905	struct input_dev *input_dev = data->input_dev;
 906	unsigned long keystates = get_unaligned_le32(&message[2]);
 907	int key;
 908
 909	for (key = 0; key < data->t15_num_keys; key++)
 910		input_report_key(input_dev, data->t15_keymap[key],
 911				 keystates & BIT(key));
 912
 913	data->update_input = true;
 914}
 915
 916static void mxt_proc_t97_messages(struct mxt_data *data, u8 *message)
 917{
 918	mxt_proc_t15_messages(data, message);
 919}
 920
 921static void mxt_proc_t100_message(struct mxt_data *data, u8 *message)
 922{
 923	struct device *dev = &data->client->dev;
 924	struct input_dev *input_dev = data->input_dev;
 925	int id;
 926	u8 status;
 927	u8 type = 0;
 928	u16 x;
 929	u16 y;
 930	int distance = 0;
 931	int tool = 0;
 932	u8 major = 0;
 933	u8 pressure = 0;
 934	u8 orientation = 0;
 935
 936	id = message[0] - data->T100_reportid_min - 2;
 937
 938	/* ignore SCRSTATUS events */
 939	if (id < 0)
 940		return;
 941
 942	status = message[1];
 943	x = get_unaligned_le16(&message[2]);
 944	y = get_unaligned_le16(&message[4]);
 945
 946	if (status & MXT_T100_DETECT) {
 947		type = (status & MXT_T100_TYPE_MASK) >> 4;
 948
 949		switch (type) {
 950		case MXT_T100_TYPE_HOVERING_FINGER:
 951			tool = MT_TOOL_FINGER;
 952			distance = MXT_DISTANCE_HOVERING;
 953
 954			if (data->t100_aux_vect)
 955				orientation = message[data->t100_aux_vect];
 956
 957			break;
 958
 959		case MXT_T100_TYPE_FINGER:
 960		case MXT_T100_TYPE_GLOVE:
 961			tool = MT_TOOL_FINGER;
 962			distance = MXT_DISTANCE_ACTIVE_TOUCH;
 963
 964			if (data->t100_aux_area)
 965				major = message[data->t100_aux_area];
 966
 967			if (data->t100_aux_ampl)
 968				pressure = message[data->t100_aux_ampl];
 969
 970			if (data->t100_aux_vect)
 971				orientation = message[data->t100_aux_vect];
 972
 973			break;
 974
 975		case MXT_T100_TYPE_PASSIVE_STYLUS:
 976			tool = MT_TOOL_PEN;
 977
 978			/*
 979			 * Passive stylus is reported with size zero so
 980			 * hardcode.
 981			 */
 982			major = MXT_TOUCH_MAJOR_DEFAULT;
 983
 984			if (data->t100_aux_ampl)
 985				pressure = message[data->t100_aux_ampl];
 986
 987			break;
 988
 989		case MXT_T100_TYPE_LARGE_TOUCH:
 990			/* Ignore suppressed touch */
 991			break;
 992
 993		default:
 994			dev_dbg(dev, "Unexpected T100 type\n");
 995			return;
 996		}
 997	}
 998
 999	/*
1000	 * Values reported should be non-zero if tool is touching the
1001	 * device
1002	 */
1003	if (!pressure && type != MXT_T100_TYPE_HOVERING_FINGER)
1004		pressure = MXT_PRESSURE_DEFAULT;
1005
1006	input_mt_slot(input_dev, id);
1007
1008	if (status & MXT_T100_DETECT) {
1009		dev_dbg(dev, "[%u] type:%u x:%u y:%u a:%02X p:%02X v:%02X\n",
1010			id, type, x, y, major, pressure, orientation);
1011
1012		input_mt_report_slot_state(input_dev, tool, 1);
1013		input_report_abs(input_dev, ABS_MT_POSITION_X, x);
1014		input_report_abs(input_dev, ABS_MT_POSITION_Y, y);
1015		input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, major);
1016		input_report_abs(input_dev, ABS_MT_PRESSURE, pressure);
1017		input_report_abs(input_dev, ABS_MT_DISTANCE, distance);
1018		input_report_abs(input_dev, ABS_MT_ORIENTATION, orientation);
1019	} else {
1020		dev_dbg(dev, "[%u] release\n", id);
1021
1022		/* close out slot */
1023		input_mt_report_slot_inactive(input_dev);
1024	}
1025
1026	data->update_input = true;
1027}
1028
1029static int mxt_proc_message(struct mxt_data *data, u8 *message)
1030{
1031	u8 report_id = message[0];
1032
1033	if (report_id == MXT_RPTID_NOMSG)
1034		return 0;
1035
1036	if (report_id == data->T6_reportid) {
1037		mxt_proc_t6_messages(data, message);
1038	} else if (!data->input_dev) {
1039		/*
1040		 * Do not report events if input device
1041		 * is not yet registered.
1042		 */
1043		mxt_dump_message(data, message);
1044	} else if (report_id >= data->T9_reportid_min &&
1045		   report_id <= data->T9_reportid_max) {
1046		mxt_proc_t9_message(data, message);
1047	} else if (report_id >= data->T15_reportid_min &&
1048		   report_id <= data->T15_reportid_max) {
1049		mxt_proc_t15_messages(data, message);
1050	} else if (report_id >= data->T97_reportid_min &&
1051		   report_id <= data->T97_reportid_max) {
1052		mxt_proc_t97_messages(data, message);
1053	} else if (report_id >= data->T100_reportid_min &&
1054		   report_id <= data->T100_reportid_max) {
1055		mxt_proc_t100_message(data, message);
1056	} else if (report_id == data->T19_reportid) {
1057		mxt_input_button(data, message);
1058		data->update_input = true;
1059	} else {
1060		mxt_dump_message(data, message);
1061	}
1062
1063	return 1;
1064}
1065
1066static int mxt_read_and_process_messages(struct mxt_data *data, u8 count)
1067{
1068	struct device *dev = &data->client->dev;
1069	int ret;
1070	int i;
1071	u8 num_valid = 0;
1072
1073	/* Safety check for msg_buf */
1074	if (count > data->max_reportid)
1075		return -EINVAL;
1076
1077	/* Process remaining messages if necessary */
1078	ret = __mxt_read_reg(data->client, data->T5_address,
1079				data->T5_msg_size * count, data->msg_buf);
1080	if (ret) {
1081		dev_err(dev, "Failed to read %u messages (%d)\n", count, ret);
1082		return ret;
1083	}
1084
1085	for (i = 0;  i < count; i++) {
1086		ret = mxt_proc_message(data,
1087			data->msg_buf + data->T5_msg_size * i);
1088
1089		if (ret == 1)
1090			num_valid++;
1091	}
1092
1093	/* return number of messages read */
1094	return num_valid;
1095}
1096
1097static irqreturn_t mxt_process_messages_t44(struct mxt_data *data)
1098{
1099	struct device *dev = &data->client->dev;
1100	int ret;
1101	u8 count, num_left;
1102
1103	/* Read T44 and T5 together */
1104	ret = __mxt_read_reg(data->client, data->T44_address,
1105		data->T5_msg_size + 1, data->msg_buf);
1106	if (ret) {
1107		dev_err(dev, "Failed to read T44 and T5 (%d)\n", ret);
1108		return IRQ_NONE;
1109	}
1110
1111	count = data->msg_buf[0];
1112
1113	/*
1114	 * This condition may be caused by the CHG line being configured in
1115	 * Mode 0. It results in unnecessary I2C operations but it is benign.
1116	 */
1117	if (count == 0)
1118		return IRQ_NONE;
1119
1120	if (count > data->max_reportid) {
1121		dev_warn(dev, "T44 count %d exceeded max report id\n", count);
1122		count = data->max_reportid;
1123	}
1124
1125	/* Process first message */
1126	ret = mxt_proc_message(data, data->msg_buf + 1);
1127	if (ret < 0) {
1128		dev_warn(dev, "Unexpected invalid message\n");
1129		return IRQ_NONE;
1130	}
1131
1132	num_left = count - 1;
1133
1134	/* Process remaining messages if necessary */
1135	if (num_left) {
1136		ret = mxt_read_and_process_messages(data, num_left);
1137		if (ret < 0)
1138			goto end;
1139		else if (ret != num_left)
1140			dev_warn(dev, "Unexpected invalid message\n");
1141	}
1142
1143end:
1144	if (data->update_input) {
1145		mxt_input_sync(data);
1146		data->update_input = false;
1147	}
1148
1149	return IRQ_HANDLED;
1150}
1151
1152static int mxt_process_messages_until_invalid(struct mxt_data *data)
1153{
1154	struct device *dev = &data->client->dev;
1155	int count, read;
1156	u8 tries = 2;
1157
1158	count = data->max_reportid;
1159
1160	/* Read messages until we force an invalid */
1161	do {
1162		read = mxt_read_and_process_messages(data, count);
1163		if (read < count)
1164			return 0;
1165	} while (--tries);
1166
1167	if (data->update_input) {
1168		mxt_input_sync(data);
1169		data->update_input = false;
1170	}
1171
1172	dev_err(dev, "CHG pin isn't cleared\n");
1173	return -EBUSY;
1174}
1175
1176static irqreturn_t mxt_process_messages(struct mxt_data *data)
1177{
1178	int total_handled, num_handled;
1179	u8 count = data->last_message_count;
1180
1181	if (count < 1 || count > data->max_reportid)
1182		count = 1;
1183
1184	/* include final invalid message */
1185	total_handled = mxt_read_and_process_messages(data, count + 1);
1186	if (total_handled < 0)
1187		return IRQ_NONE;
1188	/* if there were invalid messages, then we are done */
1189	else if (total_handled <= count)
1190		goto update_count;
1191
1192	/* keep reading two msgs until one is invalid or reportid limit */
1193	do {
1194		num_handled = mxt_read_and_process_messages(data, 2);
1195		if (num_handled < 0)
1196			return IRQ_NONE;
1197
1198		total_handled += num_handled;
1199
1200		if (num_handled < 2)
1201			break;
1202	} while (total_handled < data->num_touchids);
1203
1204update_count:
1205	data->last_message_count = total_handled;
1206
1207	if (data->update_input) {
1208		mxt_input_sync(data);
1209		data->update_input = false;
1210	}
1211
1212	return IRQ_HANDLED;
1213}
1214
1215static irqreturn_t mxt_interrupt(int irq, void *dev_id)
1216{
1217	struct mxt_data *data = dev_id;
1218
1219	if (data->in_bootloader) {
1220		/* bootloader state transition completion */
1221		complete(&data->bl_completion);
1222		return IRQ_HANDLED;
1223	}
1224
1225	if (!data->object_table)
1226		return IRQ_HANDLED;
1227
1228	if (data->T44_address) {
1229		return mxt_process_messages_t44(data);
1230	} else {
1231		return mxt_process_messages(data);
1232	}
1233}
1234
1235static int mxt_t6_command(struct mxt_data *data, u16 cmd_offset,
1236			  u8 value, bool wait)
1237{
1238	u16 reg;
1239	u8 command_register;
1240	int timeout_counter = 0;
1241	int ret;
1242
1243	reg = data->T6_address + cmd_offset;
1244
1245	ret = mxt_write_reg(data->client, reg, value);
1246	if (ret)
1247		return ret;
1248
1249	if (!wait)
1250		return 0;
1251
1252	do {
1253		msleep(20);
1254		ret = __mxt_read_reg(data->client, reg, 1, &command_register);
1255		if (ret)
1256			return ret;
1257	} while (command_register != 0 && timeout_counter++ <= 100);
1258
1259	if (timeout_counter > 100) {
1260		dev_err(&data->client->dev, "Command failed!\n");
1261		return -EIO;
1262	}
1263
1264	return 0;
1265}
1266
1267static int mxt_acquire_irq(struct mxt_data *data)
1268{
1269	int error;
1270
1271	enable_irq(data->irq);
1272
1273	if (data->use_retrigen_workaround) {
1274		error = mxt_process_messages_until_invalid(data);
1275		if (error)
1276			return error;
1277	}
1278
1279	return 0;
1280}
1281
1282static int mxt_soft_reset(struct mxt_data *data)
1283{
1284	struct device *dev = &data->client->dev;
1285	int ret = 0;
1286
1287	dev_info(dev, "Resetting device\n");
1288
1289	disable_irq(data->irq);
1290
1291	reinit_completion(&data->reset_completion);
1292
1293	ret = mxt_t6_command(data, MXT_COMMAND_RESET, MXT_RESET_VALUE, false);
1294	if (ret)
1295		return ret;
1296
1297	/* Ignore CHG line for 100ms after reset */
1298	msleep(MXT_RESET_INVALID_CHG);
1299
1300	mxt_acquire_irq(data);
1301
1302	ret = mxt_wait_for_completion(data, &data->reset_completion,
1303				      MXT_RESET_TIMEOUT);
1304	if (ret)
1305		return ret;
1306
1307	return 0;
1308}
1309
1310static void mxt_update_crc(struct mxt_data *data, u8 cmd, u8 value)
1311{
1312	/*
1313	 * On failure, CRC is set to 0 and config will always be
1314	 * downloaded.
1315	 */
1316	data->config_crc = 0;
1317	reinit_completion(&data->crc_completion);
1318
1319	mxt_t6_command(data, cmd, value, true);
1320
1321	/*
1322	 * Wait for crc message. On failure, CRC is set to 0 and config will
1323	 * always be downloaded.
1324	 */
1325	mxt_wait_for_completion(data, &data->crc_completion, MXT_CRC_TIMEOUT);
1326}
1327
1328static void mxt_calc_crc24(u32 *crc, u8 firstbyte, u8 secondbyte)
1329{
1330	static const unsigned int crcpoly = 0x80001B;
1331	u32 result;
1332	u32 data_word;
1333
1334	data_word = (secondbyte << 8) | firstbyte;
1335	result = ((*crc << 1) ^ data_word);
1336
1337	if (result & 0x1000000)
1338		result ^= crcpoly;
1339
1340	*crc = result;
1341}
1342
1343static u32 mxt_calculate_crc(u8 *base, off_t start_off, off_t end_off)
1344{
1345	u32 crc = 0;
1346	u8 *ptr = base + start_off;
1347	u8 *last_val = base + end_off - 1;
1348
1349	if (end_off < start_off)
1350		return -EINVAL;
1351
1352	while (ptr < last_val) {
1353		mxt_calc_crc24(&crc, *ptr, *(ptr + 1));
1354		ptr += 2;
1355	}
1356
1357	/* if len is odd, fill the last byte with 0 */
1358	if (ptr == last_val)
1359		mxt_calc_crc24(&crc, *ptr, 0);
1360
1361	/* Mask to 24-bit */
1362	crc &= 0x00FFFFFF;
1363
1364	return crc;
1365}
1366
1367static int mxt_check_retrigen(struct mxt_data *data)
1368{
1369	struct i2c_client *client = data->client;
1370	int error;
1371	int val;
1372	struct irq_data *irqd;
1373
1374	data->use_retrigen_workaround = false;
1375
1376	irqd = irq_get_irq_data(data->irq);
1377	if (!irqd)
1378		return -EINVAL;
1379
1380	if (irqd_is_level_type(irqd))
1381		return 0;
1382
1383	if (data->T18_address) {
1384		error = __mxt_read_reg(client,
1385				       data->T18_address + MXT_COMMS_CTRL,
1386				       1, &val);
1387		if (error)
1388			return error;
1389
1390		if (val & MXT_COMMS_RETRIGEN)
1391			return 0;
1392	}
1393
1394	dev_warn(&client->dev, "Enabling RETRIGEN workaround\n");
1395	data->use_retrigen_workaround = true;
1396	return 0;
1397}
1398
1399static int mxt_prepare_cfg_mem(struct mxt_data *data, struct mxt_cfg *cfg)
1400{
1401	struct device *dev = &data->client->dev;
1402	struct mxt_object *object;
1403	unsigned int type, instance, size, byte_offset;
1404	int offset;
1405	int ret;
1406	int i;
1407	u16 reg;
1408	u8 val;
1409
1410	while (cfg->raw_pos < cfg->raw_size) {
1411		/* Read type, instance, length */
1412		ret = sscanf(cfg->raw + cfg->raw_pos, "%x %x %x%n",
1413			     &type, &instance, &size, &offset);
1414		if (ret == 0) {
1415			/* EOF */
1416			break;
1417		} else if (ret != 3) {
1418			dev_err(dev, "Bad format: failed to parse object\n");
1419			return -EINVAL;
1420		}
1421		cfg->raw_pos += offset;
1422
1423		object = mxt_get_object(data, type);
1424		if (!object) {
1425			/* Skip object */
1426			for (i = 0; i < size; i++) {
1427				ret = sscanf(cfg->raw + cfg->raw_pos, "%hhx%n",
1428					     &val, &offset);
1429				if (ret != 1) {
1430					dev_err(dev, "Bad format in T%d at %d\n",
1431						type, i);
1432					return -EINVAL;
1433				}
1434				cfg->raw_pos += offset;
1435			}
1436			continue;
1437		}
1438
1439		if (size > mxt_obj_size(object)) {
1440			/*
1441			 * Either we are in fallback mode due to wrong
1442			 * config or config from a later fw version,
1443			 * or the file is corrupt or hand-edited.
1444			 */
1445			dev_warn(dev, "Discarding %zu byte(s) in T%u\n",
1446				 size - mxt_obj_size(object), type);
1447		} else if (mxt_obj_size(object) > size) {
1448			/*
1449			 * If firmware is upgraded, new bytes may be added to
1450			 * end of objects. It is generally forward compatible
1451			 * to zero these bytes - previous behaviour will be
1452			 * retained. However this does invalidate the CRC and
1453			 * will force fallback mode until the configuration is
1454			 * updated. We warn here but do nothing else - the
1455			 * malloc has zeroed the entire configuration.
1456			 */
1457			dev_warn(dev, "Zeroing %zu byte(s) in T%d\n",
1458				 mxt_obj_size(object) - size, type);
1459		}
1460
1461		if (instance >= mxt_obj_instances(object)) {
1462			dev_err(dev, "Object instances exceeded!\n");
1463			return -EINVAL;
1464		}
1465
1466		reg = object->start_address + mxt_obj_size(object) * instance;
1467
1468		for (i = 0; i < size; i++) {
1469			ret = sscanf(cfg->raw + cfg->raw_pos, "%hhx%n",
1470				     &val,
1471				     &offset);
1472			if (ret != 1) {
1473				dev_err(dev, "Bad format in T%d at %d\n",
1474					type, i);
1475				return -EINVAL;
1476			}
1477			cfg->raw_pos += offset;
1478
1479			if (i > mxt_obj_size(object))
1480				continue;
1481
1482			byte_offset = reg + i - cfg->start_ofs;
1483
1484			if (byte_offset >= 0 && byte_offset < cfg->mem_size) {
1485				*(cfg->mem + byte_offset) = val;
1486			} else {
1487				dev_err(dev, "Bad object: reg:%d, T%d, ofs=%d\n",
1488					reg, object->type, byte_offset);
1489				return -EINVAL;
1490			}
1491		}
1492	}
1493
1494	return 0;
1495}
1496
1497static int mxt_upload_cfg_mem(struct mxt_data *data, struct mxt_cfg *cfg)
1498{
1499	unsigned int byte_offset = 0;
1500	int error;
1501
1502	/* Write configuration as blocks */
1503	while (byte_offset < cfg->mem_size) {
1504		unsigned int size = cfg->mem_size - byte_offset;
1505
1506		if (size > MXT_MAX_BLOCK_WRITE)
1507			size = MXT_MAX_BLOCK_WRITE;
1508
1509		error = __mxt_write_reg(data->client,
1510					cfg->start_ofs + byte_offset,
1511					size, cfg->mem + byte_offset);
1512		if (error) {
1513			dev_err(&data->client->dev,
1514				"Config write error, ret=%d\n", error);
1515			return error;
1516		}
1517
1518		byte_offset += size;
1519	}
1520
1521	return 0;
1522}
1523
1524static int mxt_init_t7_power_cfg(struct mxt_data *data);
1525
1526/*
1527 * mxt_update_cfg - download configuration to chip
1528 *
1529 * Atmel Raw Config File Format
1530 *
1531 * The first four lines of the raw config file contain:
1532 *  1) Version
1533 *  2) Chip ID Information (first 7 bytes of device memory)
1534 *  3) Chip Information Block 24-bit CRC Checksum
1535 *  4) Chip Configuration 24-bit CRC Checksum
1536 *
1537 * The rest of the file consists of one line per object instance:
1538 *   <TYPE> <INSTANCE> <SIZE> <CONTENTS>
1539 *
1540 *   <TYPE> - 2-byte object type as hex
1541 *   <INSTANCE> - 2-byte object instance number as hex
1542 *   <SIZE> - 2-byte object size as hex
1543 *   <CONTENTS> - array of <SIZE> 1-byte hex values
1544 */
1545static int mxt_update_cfg(struct mxt_data *data, const struct firmware *fw)
1546{
1547	struct device *dev = &data->client->dev;
1548	struct mxt_cfg cfg;
1549	int ret;
1550	int offset;
1551	int i;
1552	u32 info_crc, config_crc, calculated_crc;
1553	u16 crc_start = 0;
1554
1555	/* Make zero terminated copy of the OBP_RAW file */
1556	cfg.raw = kmemdup_nul(fw->data, fw->size, GFP_KERNEL);
1557	if (!cfg.raw)
1558		return -ENOMEM;
1559
1560	cfg.raw_size = fw->size;
1561
1562	mxt_update_crc(data, MXT_COMMAND_REPORTALL, 1);
1563
1564	if (strncmp(cfg.raw, MXT_CFG_MAGIC, strlen(MXT_CFG_MAGIC))) {
1565		dev_err(dev, "Unrecognised config file\n");
1566		ret = -EINVAL;
1567		goto release_raw;
1568	}
1569
1570	cfg.raw_pos = strlen(MXT_CFG_MAGIC);
1571
1572	/* Load information block and check */
1573	for (i = 0; i < sizeof(struct mxt_info); i++) {
1574		ret = sscanf(cfg.raw + cfg.raw_pos, "%hhx%n",
1575			     (unsigned char *)&cfg.info + i,
1576			     &offset);
1577		if (ret != 1) {
1578			dev_err(dev, "Bad format\n");
1579			ret = -EINVAL;
1580			goto release_raw;
1581		}
1582
1583		cfg.raw_pos += offset;
1584	}
1585
1586	if (cfg.info.family_id != data->info->family_id) {
1587		dev_err(dev, "Family ID mismatch!\n");
1588		ret = -EINVAL;
1589		goto release_raw;
1590	}
1591
1592	if (cfg.info.variant_id != data->info->variant_id) {
1593		dev_err(dev, "Variant ID mismatch!\n");
1594		ret = -EINVAL;
1595		goto release_raw;
1596	}
1597
1598	/* Read CRCs */
1599	ret = sscanf(cfg.raw + cfg.raw_pos, "%x%n", &info_crc, &offset);
1600	if (ret != 1) {
1601		dev_err(dev, "Bad format: failed to parse Info CRC\n");
1602		ret = -EINVAL;
1603		goto release_raw;
1604	}
1605	cfg.raw_pos += offset;
1606
1607	ret = sscanf(cfg.raw + cfg.raw_pos, "%x%n", &config_crc, &offset);
1608	if (ret != 1) {
1609		dev_err(dev, "Bad format: failed to parse Config CRC\n");
1610		ret = -EINVAL;
1611		goto release_raw;
1612	}
1613	cfg.raw_pos += offset;
1614
1615	/*
1616	 * The Info Block CRC is calculated over mxt_info and the object
1617	 * table. If it does not match then we are trying to load the
1618	 * configuration from a different chip or firmware version, so
1619	 * the configuration CRC is invalid anyway.
1620	 */
1621	if (info_crc == data->info_crc) {
1622		if (config_crc == 0 || data->config_crc == 0) {
1623			dev_info(dev, "CRC zero, attempting to apply config\n");
1624		} else if (config_crc == data->config_crc) {
1625			dev_dbg(dev, "Config CRC 0x%06X: OK\n",
1626				 data->config_crc);
1627			ret = 0;
1628			goto release_raw;
1629		} else {
1630			dev_info(dev, "Config CRC 0x%06X: does not match file 0x%06X\n",
1631				 data->config_crc, config_crc);
1632		}
1633	} else {
1634		dev_warn(dev,
1635			 "Warning: Info CRC error - device=0x%06X file=0x%06X\n",
1636			 data->info_crc, info_crc);
1637	}
1638
1639	/* Malloc memory to store configuration */
1640	cfg.start_ofs = MXT_OBJECT_START +
1641			data->info->object_num * sizeof(struct mxt_object) +
1642			MXT_INFO_CHECKSUM_SIZE;
1643	cfg.mem_size = data->mem_size - cfg.start_ofs;
1644	cfg.mem = kzalloc(cfg.mem_size, GFP_KERNEL);
1645	if (!cfg.mem) {
1646		ret = -ENOMEM;
1647		goto release_raw;
1648	}
1649
1650	ret = mxt_prepare_cfg_mem(data, &cfg);
1651	if (ret)
1652		goto release_mem;
1653
1654	/* Calculate crc of the received configs (not the raw config file) */
1655	if (data->T71_address)
1656		crc_start = data->T71_address;
1657	else if (data->T7_address)
1658		crc_start = data->T7_address;
1659	else
1660		dev_warn(dev, "Could not find CRC start\n");
1661
1662	if (crc_start > cfg.start_ofs) {
1663		calculated_crc = mxt_calculate_crc(cfg.mem,
1664						   crc_start - cfg.start_ofs,
1665						   cfg.mem_size);
1666
1667		if (config_crc > 0 && config_crc != calculated_crc)
1668			dev_warn(dev, "Config CRC in file inconsistent, calculated=%06X, file=%06X\n",
1669				 calculated_crc, config_crc);
1670	}
1671
1672	ret = mxt_upload_cfg_mem(data, &cfg);
1673	if (ret)
1674		goto release_mem;
1675
1676	mxt_update_crc(data, MXT_COMMAND_BACKUPNV, MXT_BACKUP_VALUE);
1677
1678	ret = mxt_check_retrigen(data);
1679	if (ret)
1680		goto release_mem;
1681
1682	ret = mxt_soft_reset(data);
1683	if (ret)
1684		goto release_mem;
1685
1686	dev_info(dev, "Config successfully updated\n");
1687
1688	/* T7 config may have changed */
1689	mxt_init_t7_power_cfg(data);
1690
1691release_mem:
1692	kfree(cfg.mem);
1693release_raw:
1694	kfree(cfg.raw);
1695	return ret;
1696}
1697
1698static void mxt_free_input_device(struct mxt_data *data)
1699{
1700	if (data->input_dev) {
1701		input_unregister_device(data->input_dev);
1702		data->input_dev = NULL;
1703	}
1704}
1705
1706static void mxt_free_object_table(struct mxt_data *data)
1707{
1708#ifdef CONFIG_TOUCHSCREEN_ATMEL_MXT_T37
1709	video_unregister_device(&data->dbg.vdev);
1710	v4l2_device_unregister(&data->dbg.v4l2);
1711#endif
1712	data->object_table = NULL;
1713	data->info = NULL;
1714	kfree(data->raw_info_block);
1715	data->raw_info_block = NULL;
1716	kfree(data->msg_buf);
1717	data->msg_buf = NULL;
1718	data->T5_address = 0;
1719	data->T5_msg_size = 0;
1720	data->T6_reportid = 0;
1721	data->T7_address = 0;
1722	data->T71_address = 0;
1723	data->T9_reportid_min = 0;
1724	data->T9_reportid_max = 0;
1725	data->T15_reportid_min = 0;
1726	data->T15_reportid_max = 0;
1727	data->T18_address = 0;
1728	data->T19_reportid = 0;
1729	data->T44_address = 0;
1730	data->T97_reportid_min = 0;
1731	data->T97_reportid_max = 0;
1732	data->T100_reportid_min = 0;
1733	data->T100_reportid_max = 0;
1734	data->max_reportid = 0;
1735}
1736
1737static int mxt_parse_object_table(struct mxt_data *data,
1738				  struct mxt_object *object_table)
1739{
1740	struct i2c_client *client = data->client;
1741	int i;
1742	u8 reportid;
1743	u16 end_address;
1744
1745	/* Valid Report IDs start counting from 1 */
1746	reportid = 1;
1747	data->mem_size = 0;
1748	for (i = 0; i < data->info->object_num; i++) {
1749		struct mxt_object *object = object_table + i;
1750		u8 min_id, max_id;
1751
1752		le16_to_cpus(&object->start_address);
1753
1754		if (object->num_report_ids) {
1755			min_id = reportid;
1756			reportid += object->num_report_ids *
1757					mxt_obj_instances(object);
1758			max_id = reportid - 1;
1759		} else {
1760			min_id = 0;
1761			max_id = 0;
1762		}
1763
1764		dev_dbg(&data->client->dev,
1765			"T%u Start:%u Size:%zu Instances:%zu Report IDs:%u-%u\n",
1766			object->type, object->start_address,
1767			mxt_obj_size(object), mxt_obj_instances(object),
1768			min_id, max_id);
1769
1770		switch (object->type) {
1771		case MXT_GEN_MESSAGE_T5:
1772			if (data->info->family_id == 0x80 &&
1773			    data->info->version < 0x20) {
1774				/*
1775				 * On mXT224 firmware versions prior to V2.0
1776				 * read and discard unused CRC byte otherwise
1777				 * DMA reads are misaligned.
1778				 */
1779				data->T5_msg_size = mxt_obj_size(object);
1780			} else {
1781				/* CRC not enabled, so skip last byte */
1782				data->T5_msg_size = mxt_obj_size(object) - 1;
1783			}
1784			data->T5_address = object->start_address;
1785			break;
1786		case MXT_GEN_COMMAND_T6:
1787			data->T6_reportid = min_id;
1788			data->T6_address = object->start_address;
1789			break;
1790		case MXT_GEN_POWER_T7:
1791			data->T7_address = object->start_address;
1792			break;
1793		case MXT_SPT_DYNAMICCONFIGURATIONCONTAINER_T71:
1794			data->T71_address = object->start_address;
1795			break;
1796		case MXT_TOUCH_MULTI_T9:
1797			data->multitouch = MXT_TOUCH_MULTI_T9;
1798			/* Only handle messages from first T9 instance */
1799			data->T9_reportid_min = min_id;
1800			data->T9_reportid_max = min_id +
1801						object->num_report_ids - 1;
1802			data->num_touchids = object->num_report_ids;
1803			break;
1804		case MXT_TOUCH_KEYARRAY_T15:
1805			data->T15_reportid_min = min_id;
1806			data->T15_reportid_max = max_id;
1807			break;
1808		case MXT_SPT_COMMSCONFIG_T18:
1809			data->T18_address = object->start_address;
1810			break;
1811		case MXT_SPT_MESSAGECOUNT_T44:
1812			data->T44_address = object->start_address;
1813			break;
1814		case MXT_SPT_GPIOPWM_T19:
1815			data->T19_reportid = min_id;
1816			break;
1817		case MXT_TOUCH_PTC_KEYS_T97:
1818			data->T97_reportid_min = min_id;
1819			data->T97_reportid_max = max_id;
1820			break;
1821		case MXT_TOUCH_MULTITOUCHSCREEN_T100:
1822			data->multitouch = MXT_TOUCH_MULTITOUCHSCREEN_T100;
1823			data->T100_reportid_min = min_id;
1824			data->T100_reportid_max = max_id;
1825			/* first two report IDs reserved */
1826			data->num_touchids = object->num_report_ids - 2;
1827			break;
1828		}
1829
1830		end_address = object->start_address
1831			+ mxt_obj_size(object) * mxt_obj_instances(object) - 1;
1832
1833		if (end_address >= data->mem_size)
1834			data->mem_size = end_address + 1;
1835	}
1836
1837	/* Store maximum reportid */
1838	data->max_reportid = reportid;
1839
1840	/* If T44 exists, T5 position has to be directly after */
1841	if (data->T44_address && (data->T5_address != data->T44_address + 1)) {
1842		dev_err(&client->dev, "Invalid T44 position\n");
1843		return -EINVAL;
1844	}
1845
1846	data->msg_buf = kcalloc(data->max_reportid,
1847				data->T5_msg_size, GFP_KERNEL);
1848	if (!data->msg_buf)
1849		return -ENOMEM;
1850
1851	return 0;
1852}
1853
1854static int mxt_read_info_block(struct mxt_data *data)
1855{
1856	struct i2c_client *client = data->client;
1857	int error;
1858	size_t size;
1859	void *id_buf, *buf;
1860	uint8_t num_objects;
1861	u32 calculated_crc;
1862	u8 *crc_ptr;
1863
1864	/* If info block already allocated, free it */
1865	if (data->raw_info_block)
1866		mxt_free_object_table(data);
1867
1868	/* Read 7-byte ID information block starting at address 0 */
1869	size = sizeof(struct mxt_info);
1870	id_buf = kzalloc(size, GFP_KERNEL);
1871	if (!id_buf)
1872		return -ENOMEM;
1873
1874	error = __mxt_read_reg(client, 0, size, id_buf);
1875	if (error)
1876		goto err_free_mem;
1877
1878	/* Resize buffer to give space for rest of info block */
1879	num_objects = ((struct mxt_info *)id_buf)->object_num;
1880	size += (num_objects * sizeof(struct mxt_object))
1881		+ MXT_INFO_CHECKSUM_SIZE;
1882
1883	buf = krealloc(id_buf, size, GFP_KERNEL);
1884	if (!buf) {
1885		error = -ENOMEM;
1886		goto err_free_mem;
1887	}
1888	id_buf = buf;
1889
1890	/* Read rest of info block */
1891	error = __mxt_read_reg(client, MXT_OBJECT_START,
1892			       size - MXT_OBJECT_START,
1893			       id_buf + MXT_OBJECT_START);
1894	if (error)
1895		goto err_free_mem;
1896
1897	/* Extract & calculate checksum */
1898	crc_ptr = id_buf + size - MXT_INFO_CHECKSUM_SIZE;
1899	data->info_crc = crc_ptr[0] | (crc_ptr[1] << 8) | (crc_ptr[2] << 16);
1900
1901	calculated_crc = mxt_calculate_crc(id_buf, 0,
1902					   size - MXT_INFO_CHECKSUM_SIZE);
1903
1904	/*
1905	 * CRC mismatch can be caused by data corruption due to I2C comms
1906	 * issue or else device is not using Object Based Protocol (eg i2c-hid)
1907	 */
1908	if ((data->info_crc == 0) || (data->info_crc != calculated_crc)) {
1909		dev_err(&client->dev,
1910			"Info Block CRC error calculated=0x%06X read=0x%06X\n",
1911			calculated_crc, data->info_crc);
1912		error = -EIO;
1913		goto err_free_mem;
1914	}
1915
1916	data->raw_info_block = id_buf;
1917	data->info = (struct mxt_info *)id_buf;
1918
1919	dev_info(&client->dev,
1920		 "Family: %u Variant: %u Firmware V%u.%u.%02X Objects: %u\n",
1921		 data->info->family_id, data->info->variant_id,
1922		 data->info->version >> 4, data->info->version & 0xf,
1923		 data->info->build, data->info->object_num);
1924
1925	/* Parse object table information */
1926	error = mxt_parse_object_table(data, id_buf + MXT_OBJECT_START);
1927	if (error) {
1928		dev_err(&client->dev, "Error %d parsing object table\n", error);
1929		mxt_free_object_table(data);
1930		return error;
1931	}
1932
1933	data->object_table = (struct mxt_object *)(id_buf + MXT_OBJECT_START);
1934
1935	return 0;
1936
1937err_free_mem:
1938	kfree(id_buf);
1939	return error;
1940}
1941
1942static int mxt_read_t9_resolution(struct mxt_data *data)
1943{
1944	struct i2c_client *client = data->client;
1945	int error;
1946	struct t9_range range;
1947	unsigned char orient;
1948	struct mxt_object *object;
1949
1950	object = mxt_get_object(data, MXT_TOUCH_MULTI_T9);
1951	if (!object)
1952		return -EINVAL;
1953
1954	error = __mxt_read_reg(client,
1955			       object->start_address + MXT_T9_XSIZE,
1956			       sizeof(data->xsize), &data->xsize);
1957	if (error)
1958		return error;
1959
1960	error = __mxt_read_reg(client,
1961			       object->start_address + MXT_T9_YSIZE,
1962			       sizeof(data->ysize), &data->ysize);
1963	if (error)
1964		return error;
1965
1966	error = __mxt_read_reg(client,
1967			       object->start_address + MXT_T9_RANGE,
1968			       sizeof(range), &range);
1969	if (error)
1970		return error;
1971
1972	data->max_x = get_unaligned_le16(&range.x);
1973	data->max_y = get_unaligned_le16(&range.y);
1974
1975	error =  __mxt_read_reg(client,
1976				object->start_address + MXT_T9_ORIENT,
1977				1, &orient);
1978	if (error)
1979		return error;
1980
1981	data->xy_switch = orient & MXT_T9_ORIENT_SWITCH;
1982	data->invertx = orient & MXT_T9_ORIENT_INVERTX;
1983	data->inverty = orient & MXT_T9_ORIENT_INVERTY;
1984
1985	return 0;
1986}
1987
1988static int mxt_read_t100_config(struct mxt_data *data)
1989{
1990	struct i2c_client *client = data->client;
1991	int error;
1992	struct mxt_object *object;
1993	u16 range_x, range_y;
1994	u8 cfg, tchaux;
1995	u8 aux;
1996
1997	object = mxt_get_object(data, MXT_TOUCH_MULTITOUCHSCREEN_T100);
1998	if (!object)
1999		return -EINVAL;
2000
2001	/* read touchscreen dimensions */
2002	error = __mxt_read_reg(client,
2003			       object->start_address + MXT_T100_XRANGE,
2004			       sizeof(range_x), &range_x);
2005	if (error)
2006		return error;
2007
2008	data->max_x = get_unaligned_le16(&range_x);
2009
2010	error = __mxt_read_reg(client,
2011			       object->start_address + MXT_T100_YRANGE,
2012			       sizeof(range_y), &range_y);
2013	if (error)
2014		return error;
2015
2016	data->max_y = get_unaligned_le16(&range_y);
2017
2018	error = __mxt_read_reg(client,
2019			       object->start_address + MXT_T100_XSIZE,
2020			       sizeof(data->xsize), &data->xsize);
2021	if (error)
2022		return error;
2023
2024	error = __mxt_read_reg(client,
2025			       object->start_address + MXT_T100_YSIZE,
2026			       sizeof(data->ysize), &data->ysize);
2027	if (error)
2028		return error;
2029
2030	/* read orientation config */
2031	error =  __mxt_read_reg(client,
2032				object->start_address + MXT_T100_CFG1,
2033				1, &cfg);
2034	if (error)
2035		return error;
2036
2037	data->xy_switch = cfg & MXT_T100_CFG_SWITCHXY;
2038	data->invertx = cfg & MXT_T100_CFG_INVERTX;
2039	data->inverty = cfg & MXT_T100_CFG_INVERTY;
2040
2041	/* allocate aux bytes */
2042	error =  __mxt_read_reg(client,
2043				object->start_address + MXT_T100_TCHAUX,
2044				1, &tchaux);
2045	if (error)
2046		return error;
2047
2048	aux = 6;
2049
2050	if (tchaux & MXT_T100_TCHAUX_VECT)
2051		data->t100_aux_vect = aux++;
2052
2053	if (tchaux & MXT_T100_TCHAUX_AMPL)
2054		data->t100_aux_ampl = aux++;
2055
2056	if (tchaux & MXT_T100_TCHAUX_AREA)
2057		data->t100_aux_area = aux++;
2058
2059	dev_dbg(&client->dev,
2060		"T100 aux mappings vect:%u ampl:%u area:%u\n",
2061		data->t100_aux_vect, data->t100_aux_ampl, data->t100_aux_area);
2062
2063	return 0;
2064}
2065
2066static int mxt_input_open(struct input_dev *dev);
2067static void mxt_input_close(struct input_dev *dev);
2068
2069static void mxt_set_up_as_touchpad(struct input_dev *input_dev,
2070				   struct mxt_data *data)
2071{
2072	int i;
2073
2074	input_dev->name = "Atmel maXTouch Touchpad";
2075
2076	__set_bit(INPUT_PROP_BUTTONPAD, input_dev->propbit);
2077
2078	input_abs_set_res(input_dev, ABS_X, MXT_PIXELS_PER_MM);
2079	input_abs_set_res(input_dev, ABS_Y, MXT_PIXELS_PER_MM);
2080	input_abs_set_res(input_dev, ABS_MT_POSITION_X,
2081			  MXT_PIXELS_PER_MM);
2082	input_abs_set_res(input_dev, ABS_MT_POSITION_Y,
2083			  MXT_PIXELS_PER_MM);
2084
2085	for (i = 0; i < data->t19_num_keys; i++)
2086		if (data->t19_keymap[i] != KEY_RESERVED)
2087			input_set_capability(input_dev, EV_KEY,
2088					     data->t19_keymap[i]);
2089}
2090
2091static int mxt_initialize_input_device(struct mxt_data *data)
2092{
2093	struct device *dev = &data->client->dev;
2094	struct input_dev *input_dev;
2095	int error;
2096	unsigned int num_mt_slots;
2097	unsigned int mt_flags = 0;
2098	int i;
2099
2100	switch (data->multitouch) {
2101	case MXT_TOUCH_MULTI_T9:
2102		num_mt_slots = data->T9_reportid_max - data->T9_reportid_min + 1;
2103		error = mxt_read_t9_resolution(data);
2104		if (error)
2105			dev_warn(dev, "Failed to initialize T9 resolution\n");
2106		break;
2107
2108	case MXT_TOUCH_MULTITOUCHSCREEN_T100:
2109		num_mt_slots = data->num_touchids;
2110		error = mxt_read_t100_config(data);
2111		if (error)
2112			dev_warn(dev, "Failed to read T100 config\n");
2113		break;
2114
2115	default:
2116		dev_err(dev, "Invalid multitouch object\n");
2117		return -EINVAL;
2118	}
2119
2120	/* Handle default values and orientation switch */
2121	if (data->max_x == 0)
2122		data->max_x = 1023;
2123
2124	if (data->max_y == 0)
2125		data->max_y = 1023;
2126
2127	if (data->xy_switch)
2128		swap(data->max_x, data->max_y);
2129
2130	dev_info(dev, "Touchscreen size X%uY%u\n", data->max_x, data->max_y);
2131
2132	/* Register input device */
2133	input_dev = input_allocate_device();
2134	if (!input_dev)
2135		return -ENOMEM;
2136
2137	input_dev->name = "Atmel maXTouch Touchscreen";
2138	input_dev->phys = data->phys;
2139	input_dev->id.bustype = BUS_I2C;
2140	input_dev->dev.parent = dev;
2141	input_dev->open = mxt_input_open;
2142	input_dev->close = mxt_input_close;
2143
2144	input_dev->keycode = data->t15_keymap;
2145	input_dev->keycodemax = data->t15_num_keys;
2146	input_dev->keycodesize = sizeof(data->t15_keymap[0]);
2147
2148	input_set_capability(input_dev, EV_KEY, BTN_TOUCH);
2149
2150	/* For single touch */
2151	input_set_abs_params(input_dev, ABS_X, 0, data->max_x, 0, 0);
2152	input_set_abs_params(input_dev, ABS_Y, 0, data->max_y, 0, 0);
2153
2154	if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
2155	    (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
2156	     data->t100_aux_ampl)) {
2157		input_set_abs_params(input_dev, ABS_PRESSURE, 0, 255, 0, 0);
2158	}
2159
2160	/* If device has buttons we assume it is a touchpad */
2161	if (data->t19_num_keys) {
2162		mxt_set_up_as_touchpad(input_dev, data);
2163		mt_flags |= INPUT_MT_POINTER;
2164	} else {
2165		mt_flags |= INPUT_MT_DIRECT;
2166	}
2167
2168	/* For multi touch */
2169	error = input_mt_init_slots(input_dev, num_mt_slots, mt_flags);
2170	if (error) {
2171		dev_err(dev, "Error %d initialising slots\n", error);
2172		goto err_free_mem;
2173	}
2174
2175	if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100) {
2176		input_set_abs_params(input_dev, ABS_MT_TOOL_TYPE,
2177				     0, MT_TOOL_MAX, 0, 0);
2178		input_set_abs_params(input_dev, ABS_MT_DISTANCE,
2179				     MXT_DISTANCE_ACTIVE_TOUCH,
2180				     MXT_DISTANCE_HOVERING,
2181				     0, 0);
2182	}
2183
2184	input_set_abs_params(input_dev, ABS_MT_POSITION_X,
2185			     0, data->max_x, 0, 0);
2186	input_set_abs_params(input_dev, ABS_MT_POSITION_Y,
2187			     0, data->max_y, 0, 0);
2188
2189	if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
2190	    (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
2191	     data->t100_aux_area)) {
2192		input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR,
2193				     0, MXT_MAX_AREA, 0, 0);
2194	}
2195
2196	if (data->multitouch == MXT_TOUCH_MULTI_T9 ||
2197	    (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
2198	     data->t100_aux_ampl)) {
2199		input_set_abs_params(input_dev, ABS_MT_PRESSURE,
2200				     0, 255, 0, 0);
2201	}
2202
2203	if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
2204	    data->t100_aux_vect) {
2205		input_set_abs_params(input_dev, ABS_MT_ORIENTATION,
2206				     0, 255, 0, 0);
2207	}
2208
2209	if (data->multitouch == MXT_TOUCH_MULTITOUCHSCREEN_T100 &&
2210	    data->t100_aux_vect) {
2211		input_set_abs_params(input_dev, ABS_MT_ORIENTATION,
2212				     0, 255, 0, 0);
2213	}
2214
2215	/* For T15 and T97 Key Array */
2216	if (data->T15_reportid_min || data->T97_reportid_min) {
2217		for (i = 0; i < data->t15_num_keys; i++)
2218			input_set_capability(input_dev,
2219					     EV_KEY, data->t15_keymap[i]);
2220	}
2221
2222	input_set_drvdata(input_dev, data);
2223
2224	error = input_register_device(input_dev);
2225	if (error) {
2226		dev_err(dev, "Error %d registering input device\n", error);
2227		goto err_free_mem;
2228	}
2229
2230	data->input_dev = input_dev;
2231
2232	return 0;
2233
2234err_free_mem:
2235	input_free_device(input_dev);
2236	return error;
2237}
2238
2239static int mxt_configure_objects(struct mxt_data *data,
2240				 const struct firmware *cfg);
2241
2242static void mxt_config_cb(const struct firmware *cfg, void *ctx)
2243{
2244	mxt_configure_objects(ctx, cfg);
2245	release_firmware(cfg);
2246}
2247
2248static int mxt_initialize(struct mxt_data *data)
2249{
2250	struct i2c_client *client = data->client;
2251	int recovery_attempts = 0;
2252	int error;
2253
2254	while (1) {
2255		error = mxt_read_info_block(data);
2256		if (!error)
2257			break;
2258
2259		/* Check bootloader state */
2260		error = mxt_probe_bootloader(data, false);
2261		if (error) {
2262			dev_info(&client->dev, "Trying alternate bootloader address\n");
2263			error = mxt_probe_bootloader(data, true);
2264			if (error) {
2265				/* Chip is not in appmode or bootloader mode */
2266				return error;
2267			}
2268		}
2269
2270		/* OK, we are in bootloader, see if we can recover */
2271		if (++recovery_attempts > 1) {
2272			dev_err(&client->dev, "Could not recover from bootloader mode\n");
2273			/*
2274			 * We can reflash from this state, so do not
2275			 * abort initialization.
2276			 */
2277			data->in_bootloader = true;
2278			return 0;
2279		}
2280
2281		/* Attempt to exit bootloader into app mode */
2282		mxt_send_bootloader_cmd(data, false);
2283		msleep(MXT_FW_RESET_TIME);
2284	}
2285
2286	error = mxt_check_retrigen(data);
2287	if (error)
2288		return error;
2289
2290	error = mxt_acquire_irq(data);
2291	if (error)
2292		return error;
2293
2294	error = request_firmware_nowait(THIS_MODULE, true, MXT_CFG_NAME,
2295					&client->dev, GFP_KERNEL, data,
2296					mxt_config_cb);
2297	if (error) {
2298		dev_err(&client->dev, "Failed to invoke firmware loader: %d\n",
2299			error);
2300		return error;
2301	}
2302
2303	return 0;
2304}
2305
2306static int mxt_set_t7_power_cfg(struct mxt_data *data, u8 sleep)
2307{
2308	struct device *dev = &data->client->dev;
2309	int error;
2310	struct t7_config *new_config;
2311	struct t7_config deepsleep = { .active = 0, .idle = 0 };
2312
2313	if (sleep == MXT_POWER_CFG_DEEPSLEEP)
2314		new_config = &deepsleep;
2315	else
2316		new_config = &data->t7_cfg;
2317
2318	error = __mxt_write_reg(data->client, data->T7_address,
2319				sizeof(data->t7_cfg), new_config);
2320	if (error)
2321		return error;
2322
2323	dev_dbg(dev, "Set T7 ACTV:%d IDLE:%d\n",
2324		new_config->active, new_config->idle);
2325
2326	return 0;
2327}
2328
2329static int mxt_init_t7_power_cfg(struct mxt_data *data)
2330{
2331	struct device *dev = &data->client->dev;
2332	int error;
2333	bool retry = false;
2334
2335recheck:
2336	error = __mxt_read_reg(data->client, data->T7_address,
2337				sizeof(data->t7_cfg), &data->t7_cfg);
2338	if (error)
2339		return error;
2340
2341	if (data->t7_cfg.active == 0 || data->t7_cfg.idle == 0) {
2342		if (!retry) {
2343			dev_dbg(dev, "T7 cfg zero, resetting\n");
2344			mxt_soft_reset(data);
2345			retry = true;
2346			goto recheck;
2347		} else {
2348			dev_dbg(dev, "T7 cfg zero after reset, overriding\n");
2349			data->t7_cfg.active = 20;
2350			data->t7_cfg.idle = 100;
2351			return mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN);
2352		}
2353	}
2354
2355	dev_dbg(dev, "Initialized power cfg: ACTV %d, IDLE %d\n",
2356		data->t7_cfg.active, data->t7_cfg.idle);
2357	return 0;
2358}
2359
2360#ifdef CONFIG_TOUCHSCREEN_ATMEL_MXT_T37
2361static const struct v4l2_file_operations mxt_video_fops = {
2362	.owner = THIS_MODULE,
2363	.open = v4l2_fh_open,
2364	.release = vb2_fop_release,
2365	.unlocked_ioctl = video_ioctl2,
2366	.read = vb2_fop_read,
2367	.mmap = vb2_fop_mmap,
2368	.poll = vb2_fop_poll,
2369};
2370
2371static u16 mxt_get_debug_value(struct mxt_data *data, unsigned int x,
2372			       unsigned int y)
2373{
2374	struct mxt_info *info = data->info;
2375	struct mxt_dbg *dbg = &data->dbg;
2376	unsigned int ofs, page;
2377	unsigned int col = 0;
2378	unsigned int col_width;
2379
2380	if (info->family_id == MXT_FAMILY_1386) {
2381		col_width = info->matrix_ysize / MXT1386_COLUMNS;
2382		col = y / col_width;
2383		y = y % col_width;
2384	} else {
2385		col_width = info->matrix_ysize;
2386	}
2387
2388	ofs = (y + (x * col_width)) * sizeof(u16);
2389	page = ofs / MXT_DIAGNOSTIC_SIZE;
2390	ofs %= MXT_DIAGNOSTIC_SIZE;
2391
2392	if (info->family_id == MXT_FAMILY_1386)
2393		page += col * MXT1386_PAGES_PER_COLUMN;
2394
2395	return get_unaligned_le16(&dbg->t37_buf[page].data[ofs]);
2396}
2397
2398static int mxt_convert_debug_pages(struct mxt_data *data, u16 *outbuf)
2399{
2400	struct mxt_dbg *dbg = &data->dbg;
2401	unsigned int x = 0;
2402	unsigned int y = 0;
2403	unsigned int i, rx, ry;
2404
2405	for (i = 0; i < dbg->t37_nodes; i++) {
2406		/* Handle orientation */
2407		rx = data->xy_switch ? y : x;
2408		ry = data->xy_switch ? x : y;
2409		rx = data->invertx ? (data->xsize - 1 - rx) : rx;
2410		ry = data->inverty ? (data->ysize - 1 - ry) : ry;
2411
2412		outbuf[i] = mxt_get_debug_value(data, rx, ry);
2413
2414		/* Next value */
2415		if (++x >= (data->xy_switch ? data->ysize : data->xsize)) {
2416			x = 0;
2417			y++;
2418		}
2419	}
2420
2421	return 0;
2422}
2423
2424static int mxt_read_diagnostic_debug(struct mxt_data *data, u8 mode,
2425				     u16 *outbuf)
2426{
2427	struct mxt_dbg *dbg = &data->dbg;
2428	int retries = 0;
2429	int page;
2430	int ret;
2431	u8 cmd = mode;
2432	struct t37_debug *p;
2433	u8 cmd_poll;
2434
2435	for (page = 0; page < dbg->t37_pages; page++) {
2436		p = dbg->t37_buf + page;
2437
2438		ret = mxt_write_reg(data->client, dbg->diag_cmd_address,
2439				    cmd);
2440		if (ret)
2441			return ret;
2442
2443		retries = 0;
2444		msleep(20);
2445wait_cmd:
2446		/* Read back command byte */
2447		ret = __mxt_read_reg(data->client, dbg->diag_cmd_address,
2448				     sizeof(cmd_poll), &cmd_poll);
2449		if (ret)
2450			return ret;
2451
2452		/* Field is cleared once the command has been processed */
2453		if (cmd_poll) {
2454			if (retries++ > 100)
2455				return -EINVAL;
2456
2457			msleep(20);
2458			goto wait_cmd;
2459		}
2460
2461		/* Read T37 page */
2462		ret = __mxt_read_reg(data->client, dbg->t37_address,
2463				     sizeof(struct t37_debug), p);
2464		if (ret)
2465			return ret;
2466
2467		if (p->mode != mode || p->page != page) {
2468			dev_err(&data->client->dev, "T37 page mismatch\n");
2469			return -EINVAL;
2470		}
2471
2472		dev_dbg(&data->client->dev, "%s page:%d retries:%d\n",
2473			__func__, page, retries);
2474
2475		/* For remaining pages, write PAGEUP rather than mode */
2476		cmd = MXT_DIAGNOSTIC_PAGEUP;
2477	}
2478
2479	return mxt_convert_debug_pages(data, outbuf);
2480}
2481
2482static int mxt_queue_setup(struct vb2_queue *q,
2483		       unsigned int *nbuffers, unsigned int *nplanes,
2484		       unsigned int sizes[], struct device *alloc_devs[])
2485{
2486	struct mxt_data *data = q->drv_priv;
2487	size_t size = data->dbg.t37_nodes * sizeof(u16);
2488
2489	if (*nplanes)
2490		return sizes[0] < size ? -EINVAL : 0;
2491
2492	*nplanes = 1;
2493	sizes[0] = size;
2494
2495	return 0;
2496}
2497
2498static void mxt_buffer_queue(struct vb2_buffer *vb)
2499{
2500	struct mxt_data *data = vb2_get_drv_priv(vb->vb2_queue);
2501	u16 *ptr;
2502	int ret;
2503	u8 mode;
2504
2505	ptr = vb2_plane_vaddr(vb, 0);
2506	if (!ptr) {
2507		dev_err(&data->client->dev, "Error acquiring frame ptr\n");
2508		goto fault;
2509	}
2510
2511	switch (data->dbg.input) {
2512	case MXT_V4L_INPUT_DELTAS:
2513	default:
2514		mode = MXT_DIAGNOSTIC_DELTAS;
2515		break;
2516
2517	case MXT_V4L_INPUT_REFS:
2518		mode = MXT_DIAGNOSTIC_REFS;
2519		break;
2520	}
2521
2522	ret = mxt_read_diagnostic_debug(data, mode, ptr);
2523	if (ret)
2524		goto fault;
2525
2526	vb2_set_plane_payload(vb, 0, data->dbg.t37_nodes * sizeof(u16));
2527	vb2_buffer_done(vb, VB2_BUF_STATE_DONE);
2528	return;
2529
2530fault:
2531	vb2_buffer_done(vb, VB2_BUF_STATE_ERROR);
2532}
2533
2534/* V4L2 structures */
2535static const struct vb2_ops mxt_queue_ops = {
2536	.queue_setup		= mxt_queue_setup,
2537	.buf_queue		= mxt_buffer_queue,
2538	.wait_prepare		= vb2_ops_wait_prepare,
2539	.wait_finish		= vb2_ops_wait_finish,
2540};
2541
2542static const struct vb2_queue mxt_queue = {
2543	.type = V4L2_BUF_TYPE_VIDEO_CAPTURE,
2544	.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF | VB2_READ,
2545	.buf_struct_size = sizeof(struct mxt_vb2_buffer),
2546	.ops = &mxt_queue_ops,
2547	.mem_ops = &vb2_vmalloc_memops,
2548	.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC,
2549	.min_queued_buffers = 1,
2550};
2551
2552static int mxt_vidioc_querycap(struct file *file, void *priv,
2553				 struct v4l2_capability *cap)
2554{
2555	struct mxt_data *data = video_drvdata(file);
2556
2557	strscpy(cap->driver, "atmel_mxt_ts", sizeof(cap->driver));
2558	strscpy(cap->card, "atmel_mxt_ts touch", sizeof(cap->card));
2559	snprintf(cap->bus_info, sizeof(cap->bus_info),
2560		 "I2C:%s", dev_name(&data->client->dev));
2561	return 0;
2562}
2563
2564static int mxt_vidioc_enum_input(struct file *file, void *priv,
2565				   struct v4l2_input *i)
2566{
2567	if (i->index >= MXT_V4L_INPUT_MAX)
2568		return -EINVAL;
2569
2570	i->type = V4L2_INPUT_TYPE_TOUCH;
2571
2572	switch (i->index) {
2573	case MXT_V4L_INPUT_REFS:
2574		strscpy(i->name, "Mutual Capacitance References",
2575			sizeof(i->name));
2576		break;
2577	case MXT_V4L_INPUT_DELTAS:
2578		strscpy(i->name, "Mutual Capacitance Deltas", sizeof(i->name));
2579		break;
2580	}
2581
2582	return 0;
2583}
2584
2585static int mxt_set_input(struct mxt_data *data, unsigned int i)
2586{
2587	struct v4l2_pix_format *f = &data->dbg.format;
2588
2589	if (i >= MXT_V4L_INPUT_MAX)
2590		return -EINVAL;
2591
2592	if (i == MXT_V4L_INPUT_DELTAS)
2593		f->pixelformat = V4L2_TCH_FMT_DELTA_TD16;
2594	else
2595		f->pixelformat = V4L2_TCH_FMT_TU16;
2596
2597	f->width = data->xy_switch ? data->ysize : data->xsize;
2598	f->height = data->xy_switch ? data->xsize : data->ysize;
2599	f->field = V4L2_FIELD_NONE;
2600	f->colorspace = V4L2_COLORSPACE_RAW;
2601	f->bytesperline = f->width * sizeof(u16);
2602	f->sizeimage = f->width * f->height * sizeof(u16);
2603
2604	data->dbg.input = i;
2605
2606	return 0;
2607}
2608
2609static int mxt_vidioc_s_input(struct file *file, void *priv, unsigned int i)
2610{
2611	return mxt_set_input(video_drvdata(file), i);
2612}
2613
2614static int mxt_vidioc_g_input(struct file *file, void *priv, unsigned int *i)
2615{
2616	struct mxt_data *data = video_drvdata(file);
2617
2618	*i = data->dbg.input;
2619
2620	return 0;
2621}
2622
2623static int mxt_vidioc_fmt(struct file *file, void *priv, struct v4l2_format *f)
2624{
2625	struct mxt_data *data = video_drvdata(file);
2626
2627	f->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
2628	f->fmt.pix = data->dbg.format;
2629
2630	return 0;
2631}
2632
2633static int mxt_vidioc_enum_fmt(struct file *file, void *priv,
2634				 struct v4l2_fmtdesc *fmt)
2635{
2636	if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2637		return -EINVAL;
2638
2639	switch (fmt->index) {
2640	case 0:
2641		fmt->pixelformat = V4L2_TCH_FMT_TU16;
2642		break;
2643
2644	case 1:
2645		fmt->pixelformat = V4L2_TCH_FMT_DELTA_TD16;
2646		break;
2647
2648	default:
2649		return -EINVAL;
2650	}
2651
2652	return 0;
2653}
2654
2655static int mxt_vidioc_g_parm(struct file *file, void *fh,
2656			     struct v4l2_streamparm *a)
2657{
2658	if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
2659		return -EINVAL;
2660
2661	a->parm.capture.readbuffers = 1;
2662	a->parm.capture.timeperframe.numerator = 1;
2663	a->parm.capture.timeperframe.denominator = 10;
2664	return 0;
2665}
2666
2667static const struct v4l2_ioctl_ops mxt_video_ioctl_ops = {
2668	.vidioc_querycap        = mxt_vidioc_querycap,
2669
2670	.vidioc_enum_fmt_vid_cap = mxt_vidioc_enum_fmt,
2671	.vidioc_s_fmt_vid_cap   = mxt_vidioc_fmt,
2672	.vidioc_g_fmt_vid_cap   = mxt_vidioc_fmt,
2673	.vidioc_try_fmt_vid_cap	= mxt_vidioc_fmt,
2674	.vidioc_g_parm		= mxt_vidioc_g_parm,
2675
2676	.vidioc_enum_input      = mxt_vidioc_enum_input,
2677	.vidioc_g_input         = mxt_vidioc_g_input,
2678	.vidioc_s_input         = mxt_vidioc_s_input,
2679
2680	.vidioc_reqbufs         = vb2_ioctl_reqbufs,
2681	.vidioc_create_bufs     = vb2_ioctl_create_bufs,
2682	.vidioc_querybuf        = vb2_ioctl_querybuf,
2683	.vidioc_qbuf            = vb2_ioctl_qbuf,
2684	.vidioc_dqbuf           = vb2_ioctl_dqbuf,
2685	.vidioc_expbuf          = vb2_ioctl_expbuf,
2686
2687	.vidioc_streamon        = vb2_ioctl_streamon,
2688	.vidioc_streamoff       = vb2_ioctl_streamoff,
2689};
2690
2691static const struct video_device mxt_video_device = {
2692	.name = "Atmel maxTouch",
2693	.fops = &mxt_video_fops,
2694	.ioctl_ops = &mxt_video_ioctl_ops,
2695	.release = video_device_release_empty,
2696	.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_TOUCH |
2697		       V4L2_CAP_READWRITE | V4L2_CAP_STREAMING,
2698};
2699
2700static void mxt_debug_init(struct mxt_data *data)
2701{
2702	struct mxt_info *info = data->info;
2703	struct mxt_dbg *dbg = &data->dbg;
2704	struct mxt_object *object;
2705	int error;
2706
2707	object = mxt_get_object(data, MXT_GEN_COMMAND_T6);
2708	if (!object)
2709		goto error;
2710
2711	dbg->diag_cmd_address = object->start_address + MXT_COMMAND_DIAGNOSTIC;
2712
2713	object = mxt_get_object(data, MXT_DEBUG_DIAGNOSTIC_T37);
2714	if (!object)
2715		goto error;
2716
2717	if (mxt_obj_size(object) != sizeof(struct t37_debug)) {
2718		dev_warn(&data->client->dev, "Bad T37 size");
2719		goto error;
2720	}
2721
2722	dbg->t37_address = object->start_address;
2723
2724	/* Calculate size of data and allocate buffer */
2725	dbg->t37_nodes = data->xsize * data->ysize;
2726
2727	if (info->family_id == MXT_FAMILY_1386)
2728		dbg->t37_pages = MXT1386_COLUMNS * MXT1386_PAGES_PER_COLUMN;
2729	else
2730		dbg->t37_pages = DIV_ROUND_UP(data->xsize *
2731					      info->matrix_ysize *
2732					      sizeof(u16),
2733					      sizeof(dbg->t37_buf->data));
2734
2735	dbg->t37_buf = devm_kmalloc_array(&data->client->dev, dbg->t37_pages,
2736					  sizeof(struct t37_debug), GFP_KERNEL);
2737	if (!dbg->t37_buf)
2738		goto error;
2739
2740	/* init channel to zero */
2741	mxt_set_input(data, 0);
2742
2743	/* register video device */
2744	snprintf(dbg->v4l2.name, sizeof(dbg->v4l2.name), "%s", "atmel_mxt_ts");
2745	error = v4l2_device_register(&data->client->dev, &dbg->v4l2);
2746	if (error)
2747		goto error;
2748
2749	/* initialize the queue */
2750	mutex_init(&dbg->lock);
2751	dbg->queue = mxt_queue;
2752	dbg->queue.drv_priv = data;
2753	dbg->queue.lock = &dbg->lock;
2754	dbg->queue.dev = &data->client->dev;
2755
2756	error = vb2_queue_init(&dbg->queue);
2757	if (error)
2758		goto error_unreg_v4l2;
2759
2760	dbg->vdev = mxt_video_device;
2761	dbg->vdev.v4l2_dev = &dbg->v4l2;
2762	dbg->vdev.lock = &dbg->lock;
2763	dbg->vdev.vfl_dir = VFL_DIR_RX;
2764	dbg->vdev.queue = &dbg->queue;
2765	video_set_drvdata(&dbg->vdev, data);
2766
2767	error = video_register_device(&dbg->vdev, VFL_TYPE_TOUCH, -1);
2768	if (error)
2769		goto error_unreg_v4l2;
2770
2771	return;
2772
2773error_unreg_v4l2:
2774	v4l2_device_unregister(&dbg->v4l2);
2775error:
2776	dev_warn(&data->client->dev, "Error initializing T37\n");
2777}
2778#else
2779static void mxt_debug_init(struct mxt_data *data)
2780{
2781}
2782#endif
2783
2784static int mxt_configure_objects(struct mxt_data *data,
2785				 const struct firmware *cfg)
2786{
2787	struct device *dev = &data->client->dev;
2788	int error;
2789
2790	error = mxt_init_t7_power_cfg(data);
2791	if (error) {
2792		dev_err(dev, "Failed to initialize power cfg\n");
2793		return error;
2794	}
2795
2796	if (cfg) {
2797		error = mxt_update_cfg(data, cfg);
2798		if (error)
2799			dev_warn(dev, "Error %d updating config\n", error);
2800	}
2801
2802	if (data->multitouch) {
2803		error = mxt_initialize_input_device(data);
2804		if (error)
2805			return error;
2806	} else {
2807		dev_warn(dev, "No touch object detected\n");
2808	}
2809
2810	mxt_debug_init(data);
2811
2812	return 0;
2813}
2814
2815/* Firmware Version is returned as Major.Minor.Build */
2816static ssize_t mxt_fw_version_show(struct device *dev,
2817				   struct device_attribute *attr, char *buf)
2818{
2819	struct mxt_data *data = dev_get_drvdata(dev);
2820	struct mxt_info *info = data->info;
2821	return sysfs_emit(buf, "%u.%u.%02X\n",
2822			  info->version >> 4, info->version & 0xf, info->build);
2823}
2824
2825/* Hardware Version is returned as FamilyID.VariantID */
2826static ssize_t mxt_hw_version_show(struct device *dev,
2827				   struct device_attribute *attr, char *buf)
2828{
2829	struct mxt_data *data = dev_get_drvdata(dev);
2830	struct mxt_info *info = data->info;
2831	return sysfs_emit(buf, "%u.%u\n", info->family_id, info->variant_id);
 
2832}
2833
2834static ssize_t mxt_show_instance(char *buf, int count,
2835				 struct mxt_object *object, int instance,
2836				 const u8 *val)
2837{
2838	int i;
2839
2840	if (mxt_obj_instances(object) > 1)
2841		count += sysfs_emit_at(buf, count, "Instance %u\n", instance);
 
2842
2843	for (i = 0; i < mxt_obj_size(object); i++)
2844		count += sysfs_emit_at(buf, count, "\t[%2u]: %02x (%d)\n",
2845				       i, val[i], val[i]);
2846	count += sysfs_emit_at(buf, count, "\n");
2847
2848	return count;
2849}
2850
2851static ssize_t mxt_object_show(struct device *dev,
2852			       struct device_attribute *attr, char *buf)
2853{
2854	struct mxt_data *data = dev_get_drvdata(dev);
2855	struct mxt_object *object;
2856	int count = 0;
2857	int i, j;
2858	int error;
2859	u8 *obuf;
2860
2861	/* Pre-allocate buffer large enough to hold max sized object. */
2862	obuf = kmalloc(256, GFP_KERNEL);
2863	if (!obuf)
2864		return -ENOMEM;
2865
2866	error = 0;
2867	for (i = 0; i < data->info->object_num; i++) {
2868		object = data->object_table + i;
2869
2870		if (!mxt_object_readable(object->type))
2871			continue;
2872
2873		count += sysfs_emit_at(buf, count, "T%u:\n", object->type);
 
2874
2875		for (j = 0; j < mxt_obj_instances(object); j++) {
2876			u16 size = mxt_obj_size(object);
2877			u16 addr = object->start_address + j * size;
2878
2879			error = __mxt_read_reg(data->client, addr, size, obuf);
2880			if (error)
2881				goto done;
2882
2883			count = mxt_show_instance(buf, count, object, j, obuf);
2884		}
2885	}
2886
2887done:
2888	kfree(obuf);
2889	return error ?: count;
2890}
2891
2892static int mxt_check_firmware_format(struct device *dev,
2893				     const struct firmware *fw)
2894{
2895	unsigned int pos = 0;
2896	char c;
2897
2898	while (pos < fw->size) {
2899		c = *(fw->data + pos);
2900
2901		if (c < '0' || (c > '9' && c < 'A') || c > 'F')
2902			return 0;
2903
2904		pos++;
2905	}
2906
2907	/*
2908	 * To convert file try:
2909	 * xxd -r -p mXTXXX__APP_VX-X-XX.enc > maxtouch.fw
2910	 */
2911	dev_err(dev, "Aborting: firmware file must be in binary format\n");
2912
2913	return -EINVAL;
2914}
2915
2916static int mxt_load_fw(struct device *dev, const char *fn)
2917{
2918	struct mxt_data *data = dev_get_drvdata(dev);
2919	const struct firmware *fw = NULL;
2920	unsigned int frame_size;
2921	unsigned int pos = 0;
2922	unsigned int retry = 0;
2923	unsigned int frame = 0;
2924	int ret;
2925
2926	ret = request_firmware(&fw, fn, dev);
2927	if (ret) {
2928		dev_err(dev, "Unable to open firmware %s\n", fn);
2929		return ret;
2930	}
2931
2932	/* Check for incorrect enc file */
2933	ret = mxt_check_firmware_format(dev, fw);
2934	if (ret)
2935		goto release_firmware;
2936
2937	if (!data->in_bootloader) {
2938		/* Change to the bootloader mode */
2939		data->in_bootloader = true;
2940
2941		ret = mxt_t6_command(data, MXT_COMMAND_RESET,
2942				     MXT_BOOT_VALUE, false);
2943		if (ret)
2944			goto release_firmware;
2945
2946		msleep(MXT_RESET_TIME);
2947
2948		/* Do not need to scan since we know family ID */
2949		ret = mxt_lookup_bootloader_address(data, 0);
2950		if (ret)
2951			goto release_firmware;
2952
2953		mxt_free_input_device(data);
2954		mxt_free_object_table(data);
2955	} else {
2956		enable_irq(data->irq);
2957	}
2958
2959	reinit_completion(&data->bl_completion);
2960
2961	ret = mxt_check_bootloader(data, MXT_WAITING_BOOTLOAD_CMD, false);
2962	if (ret) {
2963		/* Bootloader may still be unlocked from previous attempt */
2964		ret = mxt_check_bootloader(data, MXT_WAITING_FRAME_DATA, false);
2965		if (ret)
2966			goto disable_irq;
2967	} else {
2968		dev_info(dev, "Unlocking bootloader\n");
2969
2970		/* Unlock bootloader */
2971		ret = mxt_send_bootloader_cmd(data, true);
2972		if (ret)
2973			goto disable_irq;
2974	}
2975
2976	while (pos < fw->size) {
2977		ret = mxt_check_bootloader(data, MXT_WAITING_FRAME_DATA, true);
2978		if (ret)
2979			goto disable_irq;
2980
2981		frame_size = ((*(fw->data + pos) << 8) | *(fw->data + pos + 1));
2982
2983		/* Take account of CRC bytes */
2984		frame_size += 2;
2985
2986		/* Write one frame to device */
2987		ret = mxt_bootloader_write(data, fw->data + pos, frame_size);
2988		if (ret)
2989			goto disable_irq;
2990
2991		ret = mxt_check_bootloader(data, MXT_FRAME_CRC_PASS, true);
2992		if (ret) {
2993			retry++;
2994
2995			/* Back off by 20ms per retry */
2996			msleep(retry * 20);
2997
2998			if (retry > 20) {
2999				dev_err(dev, "Retry count exceeded\n");
3000				goto disable_irq;
3001			}
3002		} else {
3003			retry = 0;
3004			pos += frame_size;
3005			frame++;
3006		}
3007
3008		if (frame % 50 == 0)
3009			dev_dbg(dev, "Sent %d frames, %d/%zd bytes\n",
3010				frame, pos, fw->size);
3011	}
3012
3013	/* Wait for flash. */
3014	ret = mxt_wait_for_completion(data, &data->bl_completion,
3015				      MXT_FW_RESET_TIME);
3016	if (ret)
3017		goto disable_irq;
3018
3019	dev_dbg(dev, "Sent %d frames, %d bytes\n", frame, pos);
3020
3021	/*
3022	 * Wait for device to reset. Some bootloader versions do not assert
3023	 * the CHG line after bootloading has finished, so ignore potential
3024	 * errors.
3025	 */
3026	mxt_wait_for_completion(data, &data->bl_completion, MXT_FW_RESET_TIME);
3027
3028	data->in_bootloader = false;
3029
3030disable_irq:
3031	disable_irq(data->irq);
3032release_firmware:
3033	release_firmware(fw);
3034	return ret;
3035}
3036
3037static ssize_t mxt_update_fw_store(struct device *dev,
3038					struct device_attribute *attr,
3039					const char *buf, size_t count)
3040{
3041	struct mxt_data *data = dev_get_drvdata(dev);
3042	int error;
3043
3044	error = mxt_load_fw(dev, MXT_FW_NAME);
3045	if (error) {
3046		dev_err(dev, "The firmware update failed(%d)\n", error);
3047		count = error;
3048	} else {
3049		dev_info(dev, "The firmware update succeeded\n");
3050
3051		error = mxt_initialize(data);
3052		if (error)
3053			return error;
3054	}
3055
3056	return count;
3057}
3058
3059static DEVICE_ATTR(fw_version, S_IRUGO, mxt_fw_version_show, NULL);
3060static DEVICE_ATTR(hw_version, S_IRUGO, mxt_hw_version_show, NULL);
3061static DEVICE_ATTR(object, S_IRUGO, mxt_object_show, NULL);
3062static DEVICE_ATTR(update_fw, S_IWUSR, NULL, mxt_update_fw_store);
3063
3064static struct attribute *mxt_attrs[] = {
3065	&dev_attr_fw_version.attr,
3066	&dev_attr_hw_version.attr,
3067	&dev_attr_object.attr,
3068	&dev_attr_update_fw.attr,
3069	NULL
3070};
3071
3072ATTRIBUTE_GROUPS(mxt);
 
 
3073
3074static void mxt_start(struct mxt_data *data)
3075{
3076	mxt_wakeup_toggle(data->client, true, false);
3077
3078	switch (data->suspend_mode) {
3079	case MXT_SUSPEND_T9_CTRL:
3080		mxt_soft_reset(data);
3081
3082		/* Touch enable */
3083		/* 0x83 = SCANEN | RPTEN | ENABLE */
3084		mxt_write_object(data,
3085				MXT_TOUCH_MULTI_T9, MXT_T9_CTRL, 0x83);
3086		break;
3087
3088	case MXT_SUSPEND_DEEP_SLEEP:
3089	default:
3090		mxt_set_t7_power_cfg(data, MXT_POWER_CFG_RUN);
3091
3092		/* Recalibrate since chip has been in deep sleep */
3093		mxt_t6_command(data, MXT_COMMAND_CALIBRATE, 1, false);
3094		break;
3095	}
3096}
3097
3098static void mxt_stop(struct mxt_data *data)
3099{
3100	switch (data->suspend_mode) {
3101	case MXT_SUSPEND_T9_CTRL:
3102		/* Touch disable */
3103		mxt_write_object(data,
3104				MXT_TOUCH_MULTI_T9, MXT_T9_CTRL, 0);
3105		break;
3106
3107	case MXT_SUSPEND_DEEP_SLEEP:
3108	default:
3109		mxt_set_t7_power_cfg(data, MXT_POWER_CFG_DEEPSLEEP);
3110		break;
3111	}
3112
3113	mxt_wakeup_toggle(data->client, false, false);
3114}
3115
3116static int mxt_input_open(struct input_dev *dev)
3117{
3118	struct mxt_data *data = input_get_drvdata(dev);
3119
3120	mxt_start(data);
3121
3122	return 0;
3123}
3124
3125static void mxt_input_close(struct input_dev *dev)
3126{
3127	struct mxt_data *data = input_get_drvdata(dev);
3128
3129	mxt_stop(data);
3130}
3131
3132static int mxt_parse_device_properties(struct mxt_data *data)
3133{
3134	static const char keymap_property[] = "linux,gpio-keymap";
3135	static const char buttons_property[] = "linux,keycodes";
3136	struct device *dev = &data->client->dev;
3137	u32 *keymap;
3138	u32 *buttonmap;
3139	int n_keys;
3140	int error;
3141
3142	if (device_property_present(dev, keymap_property)) {
3143		n_keys = device_property_count_u32(dev, keymap_property);
3144		if (n_keys <= 0) {
3145			error = n_keys < 0 ? n_keys : -EINVAL;
3146			dev_err(dev, "invalid/malformed '%s' property: %d\n",
3147				keymap_property, error);
3148			return error;
3149		}
3150
3151		keymap = devm_kmalloc_array(dev, n_keys, sizeof(*keymap),
3152					    GFP_KERNEL);
3153		if (!keymap)
3154			return -ENOMEM;
3155
3156		error = device_property_read_u32_array(dev, keymap_property,
3157						       keymap, n_keys);
3158		if (error) {
3159			dev_err(dev, "failed to parse '%s' property: %d\n",
3160				keymap_property, error);
3161			return error;
3162		}
3163
3164		data->t19_keymap = keymap;
3165		data->t19_num_keys = n_keys;
3166	}
3167
3168	if (device_property_present(dev, buttons_property)) {
3169		n_keys = device_property_count_u32(dev, buttons_property);
3170		if (n_keys <= 0) {
3171			error = n_keys < 0 ? n_keys : -EINVAL;
3172			dev_err(dev, "invalid/malformed '%s' property: %d\n",
3173				buttons_property, error);
3174			return error;
3175		}
3176
3177		buttonmap = devm_kmalloc_array(dev, n_keys, sizeof(*buttonmap),
3178					       GFP_KERNEL);
3179		if (!buttonmap)
3180			return -ENOMEM;
3181
3182		error = device_property_read_u32_array(dev, buttons_property,
3183						       buttonmap, n_keys);
3184		if (error) {
3185			dev_err(dev, "failed to parse '%s' property: %d\n",
3186				buttons_property, error);
3187			return error;
3188		}
3189
3190		data->t15_keymap = buttonmap;
3191		data->t15_num_keys = n_keys;
3192	}
3193
3194	return 0;
3195}
3196
3197static const struct dmi_system_id chromebook_T9_suspend_dmi[] = {
3198	{
3199		.matches = {
3200			DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
3201			DMI_MATCH(DMI_PRODUCT_NAME, "Link"),
3202		},
3203	},
3204	{
3205		.matches = {
3206			DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
3207		},
3208	},
3209	{ }
3210};
3211
3212static int mxt_probe(struct i2c_client *client)
3213{
3214	struct mxt_data *data;
3215	int error;
3216
3217	/*
3218	 * Ignore devices that do not have device properties attached to
3219	 * them, as we need help determining whether we are dealing with
3220	 * touch screen or touchpad.
3221	 *
3222	 * So far on x86 the only users of Atmel touch controllers are
3223	 * Chromebooks, and chromeos_laptop driver will ensure that
3224	 * necessary properties are provided (if firmware does not do that).
3225	 */
3226	if (!device_property_present(&client->dev, "compatible"))
3227		return -ENXIO;
3228
3229	/*
3230	 * Ignore ACPI devices representing bootloader mode.
3231	 *
3232	 * This is a bit of a hack: Google Chromebook BIOS creates ACPI
3233	 * devices for both application and bootloader modes, but we are
3234	 * interested in application mode only (if device is in bootloader
3235	 * mode we'll end up switching into application anyway). So far
3236	 * application mode addresses were all above 0x40, so we'll use it
3237	 * as a threshold.
3238	 */
3239	if (ACPI_COMPANION(&client->dev) && client->addr < 0x40)
3240		return -ENXIO;
3241
3242	data = devm_kzalloc(&client->dev, sizeof(struct mxt_data), GFP_KERNEL);
3243	if (!data)
3244		return -ENOMEM;
3245
3246	snprintf(data->phys, sizeof(data->phys), "i2c-%u-%04x/input0",
3247		 client->adapter->nr, client->addr);
3248
3249	data->client = client;
3250	data->irq = client->irq;
3251	i2c_set_clientdata(client, data);
3252
3253	init_completion(&data->bl_completion);
3254	init_completion(&data->reset_completion);
3255	init_completion(&data->crc_completion);
3256
3257	data->suspend_mode = dmi_check_system(chromebook_T9_suspend_dmi) ?
3258		MXT_SUSPEND_T9_CTRL : MXT_SUSPEND_DEEP_SLEEP;
3259
3260	error = mxt_parse_device_properties(data);
3261	if (error)
3262		return error;
3263
3264	/*
3265	 * VDDA is the analog voltage supply 2.57..3.47 V
3266	 * VDD  is the digital voltage supply 1.71..3.47 V
3267	 */
3268	data->regulators[0].supply = "vdda";
3269	data->regulators[1].supply = "vdd";
3270	error = devm_regulator_bulk_get(&client->dev, ARRAY_SIZE(data->regulators),
3271					data->regulators);
3272	if (error) {
3273		if (error != -EPROBE_DEFER)
3274			dev_err(&client->dev, "Failed to get regulators %d\n",
3275				error);
3276		return error;
3277	}
3278
3279	/* Request the RESET line as asserted so we go into reset */
3280	data->reset_gpio = devm_gpiod_get_optional(&client->dev,
3281						   "reset", GPIOD_OUT_HIGH);
3282	if (IS_ERR(data->reset_gpio)) {
3283		error = PTR_ERR(data->reset_gpio);
3284		dev_err(&client->dev, "Failed to get reset gpio: %d\n", error);
3285		return error;
3286	}
3287
3288	/* Request the WAKE line as asserted so we go out of sleep */
3289	data->wake_gpio = devm_gpiod_get_optional(&client->dev,
3290						  "wake", GPIOD_OUT_HIGH);
3291	if (IS_ERR(data->wake_gpio)) {
3292		error = PTR_ERR(data->wake_gpio);
3293		dev_err(&client->dev, "Failed to get wake gpio: %d\n", error);
3294		return error;
3295	}
3296
3297	error = devm_request_threaded_irq(&client->dev, client->irq,
3298					  NULL, mxt_interrupt,
3299					  IRQF_ONESHOT | IRQF_NO_AUTOEN,
3300					  client->name, data);
3301	if (error) {
3302		dev_err(&client->dev, "Failed to register interrupt\n");
3303		return error;
3304	}
3305
3306	error = regulator_bulk_enable(ARRAY_SIZE(data->regulators),
3307				      data->regulators);
3308	if (error) {
3309		dev_err(&client->dev, "failed to enable regulators: %d\n",
3310			error);
3311		return error;
3312	}
3313	/*
3314	 * The device takes 40ms to come up after power-on according
3315	 * to the mXT224 datasheet, page 13.
3316	 */
3317	msleep(MXT_BACKUP_TIME);
3318
3319	if (data->reset_gpio) {
3320		/* Wait a while and then de-assert the RESET GPIO line */
3321		msleep(MXT_RESET_GPIO_TIME);
3322		gpiod_set_value(data->reset_gpio, 0);
3323		msleep(MXT_RESET_INVALID_CHG);
3324	}
3325
3326	/*
3327	 * Controllers like mXT1386 have a dedicated WAKE line that could be
3328	 * connected to a GPIO or to I2C SCL pin, or permanently asserted low.
3329	 *
3330	 * This WAKE line is used for waking controller from a deep-sleep and
3331	 * it needs to be asserted low for 25 milliseconds before I2C transfers
3332	 * could be accepted by controller if it was in a deep-sleep mode.
3333	 * Controller will go into sleep automatically after 2 seconds of
3334	 * inactivity if WAKE line is deasserted and deep sleep is activated.
3335	 *
3336	 * If WAKE line is connected to I2C SCL pin, then the first I2C transfer
3337	 * will get an instant NAK and transfer needs to be retried after 25ms.
3338	 *
3339	 * If WAKE line is connected to a GPIO line, the line must be asserted
3340	 * 25ms before the host attempts to communicate with the controller.
3341	 */
3342	device_property_read_u32(&client->dev, "atmel,wakeup-method",
3343				 &data->wakeup_method);
3344
3345	error = mxt_initialize(data);
3346	if (error)
3347		goto err_disable_regulators;
 
 
 
 
 
 
 
3348
3349	return 0;
3350
3351err_disable_regulators:
3352	regulator_bulk_disable(ARRAY_SIZE(data->regulators),
3353			       data->regulators);
3354	return error;
3355}
3356
3357static void mxt_remove(struct i2c_client *client)
3358{
3359	struct mxt_data *data = i2c_get_clientdata(client);
3360
3361	disable_irq(data->irq);
 
3362	mxt_free_input_device(data);
3363	mxt_free_object_table(data);
3364	regulator_bulk_disable(ARRAY_SIZE(data->regulators),
3365			       data->regulators);
3366}
3367
3368static int mxt_suspend(struct device *dev)
3369{
3370	struct i2c_client *client = to_i2c_client(dev);
3371	struct mxt_data *data = i2c_get_clientdata(client);
3372	struct input_dev *input_dev = data->input_dev;
3373
3374	if (!input_dev)
3375		return 0;
3376
3377	mutex_lock(&input_dev->mutex);
3378
3379	if (input_device_enabled(input_dev))
3380		mxt_stop(data);
3381
3382	mutex_unlock(&input_dev->mutex);
3383
3384	disable_irq(data->irq);
3385
3386	return 0;
3387}
3388
3389static int mxt_resume(struct device *dev)
3390{
3391	struct i2c_client *client = to_i2c_client(dev);
3392	struct mxt_data *data = i2c_get_clientdata(client);
3393	struct input_dev *input_dev = data->input_dev;
3394
3395	if (!input_dev)
3396		return 0;
3397
3398	enable_irq(data->irq);
3399
3400	mutex_lock(&input_dev->mutex);
3401
3402	if (input_device_enabled(input_dev))
3403		mxt_start(data);
3404
3405	mutex_unlock(&input_dev->mutex);
3406
3407	return 0;
3408}
3409
3410static DEFINE_SIMPLE_DEV_PM_OPS(mxt_pm_ops, mxt_suspend, mxt_resume);
3411
3412static const struct of_device_id mxt_of_match[] = {
3413	{ .compatible = "atmel,maxtouch", },
3414	/* Compatibles listed below are deprecated */
3415	{ .compatible = "atmel,qt602240_ts", },
3416	{ .compatible = "atmel,atmel_mxt_ts", },
3417	{ .compatible = "atmel,atmel_mxt_tp", },
3418	{ .compatible = "atmel,mXT224", },
3419	{},
3420};
3421MODULE_DEVICE_TABLE(of, mxt_of_match);
3422
3423#ifdef CONFIG_ACPI
3424static const struct acpi_device_id mxt_acpi_id[] = {
3425	{ "ATML0000", 0 },	/* Touchpad */
3426	{ "ATML0001", 0 },	/* Touchscreen */
3427	{ }
3428};
3429MODULE_DEVICE_TABLE(acpi, mxt_acpi_id);
3430#endif
3431
3432static const struct i2c_device_id mxt_id[] = {
3433	{ "qt602240_ts" },
3434	{ "atmel_mxt_ts" },
3435	{ "atmel_mxt_tp" },
3436	{ "maxtouch" },
3437	{ "mXT224" },
3438	{ }
3439};
3440MODULE_DEVICE_TABLE(i2c, mxt_id);
3441
3442static struct i2c_driver mxt_driver = {
3443	.driver = {
3444		.name	= "atmel_mxt_ts",
3445		.dev_groups = mxt_groups,
3446		.of_match_table = mxt_of_match,
3447		.acpi_match_table = ACPI_PTR(mxt_acpi_id),
3448		.pm	= pm_sleep_ptr(&mxt_pm_ops),
3449	},
3450	.probe		= mxt_probe,
3451	.remove		= mxt_remove,
3452	.id_table	= mxt_id,
3453};
3454
3455module_i2c_driver(mxt_driver);
3456
3457/* Module information */
3458MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
3459MODULE_DESCRIPTION("Atmel maXTouch Touchscreen driver");
3460MODULE_LICENSE("GPL");