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