path: root/drivers/input/touchscreen/elants_i2c.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Elan Microelectronics touch panels with I2C interface
 *
 * Copyright (C) 2014 Elan Microelectronics Corporation.
 * Scott Liu <scott.liu@emc.com.tw>
 *
 * This code is partly based on hid-multitouch.c:
 *
 *  Copyright (c) 2010-2012 Stephane Chatty <chatty@enac.fr>
 *  Copyright (c) 2010-2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
 *  Copyright (c) 2010-2012 Ecole Nationale de l'Aviation Civile, France
 *
 * This code is partly based on i2c-hid.c:
 *
 * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
 * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
 * Copyright (c) 2012 Red Hat, Inc
 */


#include <linux/module.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/platform_device.h>
#include <linux/async.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/uaccess.h>
#include <linux/buffer_head.h>
#include <linux/slab.h>
#include <linux/firmware.h>
#include <linux/input/mt.h>
#include <linux/acpi.h>
#include <linux/of.h>
#include <linux/gpio/consumer.h>
#include <linux/regulator/consumer.h>
#include <asm/unaligned.h>

/* Device, Driver information */
#define DEVICE_NAME	"elants_i2c"

/* Convert from rows or columns into resolution */
#define ELAN_TS_RESOLUTION(n, m)   (((n) - 1) * (m))

/* FW header data */
#define HEADER_SIZE		4
#define FW_HDR_TYPE		0
#define FW_HDR_COUNT		1
#define FW_HDR_LENGTH		2

/* Buffer mode Queue Header information */
#define QUEUE_HEADER_SINGLE	0x62
#define QUEUE_HEADER_NORMAL	0X63
#define QUEUE_HEADER_WAIT	0x64

/* Command header definition */
#define CMD_HEADER_WRITE	0x54
#define CMD_HEADER_READ		0x53
#define CMD_HEADER_6B_READ	0x5B
#define CMD_HEADER_RESP		0x52
#define CMD_HEADER_6B_RESP	0x9B
#define CMD_HEADER_HELLO	0x55
#define CMD_HEADER_REK		0x66

/* FW position data */
#define PACKET_SIZE		55
#define MAX_CONTACT_NUM		10
#define FW_POS_HEADER		0
#define FW_POS_STATE		1
#define FW_POS_TOTAL		2
#define FW_POS_XY		3
#define FW_POS_CHECKSUM		34
#define FW_POS_WIDTH		35
#define FW_POS_PRESSURE		45

#define HEADER_REPORT_10_FINGER	0x62

/* Header (4 bytes) plus 3 fill 10-finger packets */
#define MAX_PACKET_SIZE		169

#define BOOT_TIME_DELAY_MS	50

/* FW read command, 0x53 0x?? 0x0, 0x01 */
#define E_ELAN_INFO_FW_VER	0x00
#define E_ELAN_INFO_BC_VER	0x10
#define E_ELAN_INFO_TEST_VER	0xE0
#define E_ELAN_INFO_FW_ID	0xF0
#define E_INFO_OSR		0xD6
#define E_INFO_PHY_SCAN		0xD7
#define E_INFO_PHY_DRIVER	0xD8

#define MAX_RETRIES		3
#define MAX_FW_UPDATE_RETRIES	30

#define ELAN_FW_PAGESIZE	132

/* calibration timeout definition */
#define ELAN_CALI_TIMEOUT_MSEC	12000

#define ELAN_POWERON_DELAY_USEC	500
#define ELAN_RESET_DELAY_MSEC	20

enum elants_state {
	ELAN_STATE_NORMAL,
	ELAN_WAIT_QUEUE_HEADER,
	ELAN_WAIT_RECALIBRATION,
};

enum elants_iap_mode {
	ELAN_IAP_OPERATIONAL,
	ELAN_IAP_RECOVERY,
};

/* struct elants_data - represents state of Elan touchscreen device */
struct elants_data {
	struct i2c_client *client;
	struct input_dev *input;

	struct regulator *vcc33;
	struct regulator *vccio;
	struct gpio_desc *reset_gpio;

	u16 fw_version;
	u8 test_version;
	u8 solution_version;