path: root/drivers/input/touchscreen/wdt87xx_i2c.c

/*
 * Weida HiTech WDT87xx TouchScreen I2C driver
 *
 * Copyright (c) 2015  Weida Hi-Tech Co., Ltd.
 * HN Chen <hn.chen@weidahitech.com>
 *
 * This software is licensed under the terms of the GNU General Public
 * License, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 */

#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/firmware.h>
#include <linux/input/mt.h>
#include <linux/acpi.h>
#include <asm/unaligned.h>

#define WDT87XX_NAME		"wdt87xx_i2c"
#define WDT87XX_FW_NAME		"wdt87xx_fw.bin"
#define WDT87XX_CFG_NAME	"wdt87xx_cfg.bin"

#define MODE_ACTIVE			0x01
#define MODE_READY			0x02
#define MODE_IDLE			0x03
#define MODE_SLEEP			0x04
#define MODE_STOP			0xFF

#define WDT_MAX_FINGER			10
#define WDT_RAW_BUF_COUNT		54
#define WDT_V1_RAW_BUF_COUNT		74
#define WDT_FIRMWARE_ID			0xa9e368f5

#define PG_SIZE				0x1000
#define MAX_RETRIES			3

#define MAX_UNIT_AXIS			0x7FFF

#define PKT_READ_SIZE			72
#define PKT_WRITE_SIZE			80

/* the finger definition of the report event */
#define FINGER_EV_OFFSET_ID		0
#define FINGER_EV_OFFSET_X		1
#define FINGER_EV_OFFSET_Y		3
#define FINGER_EV_SIZE			5

#define FINGER_EV_V1_OFFSET_ID		0
#define FINGER_EV_V1_OFFSET_W		1
#define FINGER_EV_V1_OFFSET_P		2
#define FINGER_EV_V1_OFFSET_X		3
#define FINGER_EV_V1_OFFSET_Y		5
#define FINGER_EV_V1_SIZE		7

/* The definition of a report packet */
#define TOUCH_PK_OFFSET_REPORT_ID	0
#define TOUCH_PK_OFFSET_EVENT		1
#define TOUCH_PK_OFFSET_SCAN_TIME	51
#define TOUCH_PK_OFFSET_FNGR_NUM	53

#define TOUCH_PK_V1_OFFSET_REPORT_ID	0
#define TOUCH_PK_V1_OFFSET_EVENT	1
#define TOUCH_PK_V1_OFFSET_SCAN_TIME	71
#define TOUCH_PK_V1_OFFSET_FNGR_NUM	73

/* The definition of the controller parameters */
#define CTL_PARAM_OFFSET_FW_ID		0
#define CTL_PARAM_OFFSET_PLAT_ID	2
#define CTL_PARAM_OFFSET_XMLS_ID1	4
#define CTL_PARAM_OFFSET_XMLS_ID2	6
#define CTL_PARAM_OFFSET_PHY_CH_X	8
#define CTL_PARAM_OFFSET_PHY_CH_Y	10
#define CTL_PARAM_OFFSET_PHY_X0		12
#define CTL_PARAM_OFFSET_PHY_X1		14
#define CTL_PARAM_OFFSET_PHY_Y0		16
#define CTL_PARAM_OFFSET_PHY_Y1		18
#define CTL_PARAM_OFFSET_PHY_W		22
#define CTL_PARAM_OFFSET_PHY_H		24
#define CTL_PARAM_OFFSET_FACTOR		32

/* The definition of the device descriptor */
#define WDT_GD_DEVICE			1
#define DEV_DESC_OFFSET_VID		8
#define DEV_DESC_OFFSET_PID		10

/* Communication commands */
#define PACKET_SIZE			56
#define VND_REQ_READ			0x06
#define VND_READ_DATA			0x07
#define VND_REQ_WRITE			0x08

#define VND_CMD_START			0x00
#define VND_CMD_STOP			0x01
#define VND_CMD_RESET			0x09

#define VND_CMD_ERASE			0x1A

#define VND_GET_CHECKSUM		0x66

#define VND_SET_DATA			0x83
#define VND_SET_COMMAND_DATA		0x84
#define VND_SET_CHECKSUM_CALC		0x86
#define VND_SET_CHECKSUM_LENGTH		0x87

#define VND_CMD_SFLCK			0xFC
#define VND_CMD_SFUNL			0xFD

#define CMD_SFLCK_KEY			0xC39B
#define CMD_SFUNL_KEY			0x95DA

#define STRIDX_PLATFORM_ID		0x80
#define STRIDX_PARAMETERS		0x81

#define CMD_BUF_SIZE			8
#define PKT_BUF_SIZE			64

/* The definition of the command packet */
#define CMD_REPORT_ID_OFFSET		0x0
#define CMD_TYPE_OFFSET			0x1
#define CMD_INDEX_OFFSET		0x2
#define CMD_KEY_OFFSET			0x3
#define CMD_LENGTH_OFFSET		0x4
#define CMD_DATA_OFFSET			0x8

/* The definition of firmware chunk tags */
#define FOURCC_ID_RIFF			0x46464952
#define FOURCC_ID_WHIF			0x46494857
#define FOURCC_ID_FRMT			0x544D5246
#define FOURCC_ID_FRWR			0x52575246
#define FOURCC_ID_CNFG			0x47464E43

#define CHUNK_ID_FRMT			FOURCC_ID_FRMT
#define CHUNK_ID_FRWR			FOURCC_ID_FRWR
#define CHUNK_ID_CNFG			FOURCC_ID_CNFG

#define FW_FOURCC1_OFFSET		0
#define FW_SIZE_OFFSET			4
#define FW_FOURCC2_OFFSET		8
#define FW_PAYLOAD_OFFSET		40

#define FW_CHUNK_ID_OFFSET		0
#define FW_CHUNK_SIZE_OFFSET		4
#define FW_CHUNK_TGT_START_OFFSET	8
#define FW_CHUNK_PAYLOAD_LEN_OFFSET	12
#define FW_CHUNK_SRC_START_OFFSET	16
#define FW_CHUNK_VERSION_OFFSET		20
#define FW_CHUNK_ATTR_OFFSET		24
#define FW_CHUNK_PAYLOAD_OFFSET		32

/* Controller requires minimum 300us between commands */
#define WDT_COMMAND_DELAY_MS		2
#define WDT_FLASH_WRITE_DELAY_MS	4
#define WDT_FLASH_ERASE_DELAY_MS	200
#define WDT_FW_RESET_TIME		2500

struct wdt87xx_sys_param {
	u16	fw_id;
	u16	plat_id;
	u16	xmls_id1;
	u16	xmls_id2;
	u16	phy_ch_x;
	u16	phy_ch_y;
	u16	phy_w;
	u16	phy_h;
	u16	scaling_factor;
	u32	max_x;
	u32	max_y;
	u16	vendor_id;
	u16	product_id;
};

struct wdt87xx_data {
	struct i2c_client		*client;
	struct input_dev		*input;
	/* Mutex for fw update to prevent concurrent access */
	struct mutex			fw_mutex;
	struct wdt87xx_sys_param	param;
	u8				phys[32];
};

static int wdt87xx_i2c_xfer(struct i2c_client *client,
			    void *txdata, size_t txlen,
			    void *rxdata, size_t rxlen)
{
	struct i2c_msg msgs[] = {
		{
			.addr	= client->addr,
			.flags	= 0,
			.len	= txlen,
			.buf	= txdata,
		},
		{
			.addr	= client->addr,
			.flags	= I2C_M_RD,
			.len	= rxlen,
			.buf	= rxdata,
		},
	};
	int error;
	int ret;

	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
	if (ret != ARRAY_SIZE(msgs)) {
		error = ret < 0 ? ret : -EIO;
		dev_err(&client->dev, "%s: i2c transfer failed: %d\n",
			__func__, error);
		return error;
	}

	return 0;
}

static int wdt87xx_get_desc(struct i2c_client *client, u8 desc_idx,
			    u8 *buf, size_t len)
{
	u8 tx_buf[] = { 0x22, 0x00, 0x10, 0x0E, 0x23, 0x00 };
	int error;

	tx_buf[2] |= desc_idx & 0xF;

	error = wdt87xx_i2c_xfer(