DisplayGfA001-legal-info/sources/linux-v4.4.104-bone-rt-r21/linux-004-egalax_i2c_touchcontroller.patch

From a12a55f6571c5992f5a88e8bbbaabf442c0be88c Mon Sep 17 00:00:00 2001
From: Reinhard Russinger <reinhard@russinger.at>
Date: Wed, 3 May 2017 08:25:31 +0200
Subject: [PATCH 1/1] add egalax i2c touchcontroller driver

---
 drivers/input/touchscreen/Kconfig      |  10 +
 drivers/input/touchscreen/Makefile     |   1 +
 drivers/input/touchscreen/egalax_i2c.c | 961 +++++++++++++++++++++++++++++++++
 3 files changed, 972 insertions(+)
 create mode 100644 drivers/input/touchscreen/egalax_i2c.c

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 2fb1f43..01f4776 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -318,6 +318,16 @@ config TOUCHSCREEN_FT6236
 	  To compile this driver as a module, choose M here: the
 	  module will be called ft6236.
 
+config TOUCHSCREEN_EGALAX_I2C
+	tristate "EETI eGalax (egalax_i2c) multi-touch panel support for i2C"
+	depends on I2C && OF
+	help
+	  Say Y here to enable support for I2C connected EETI
+	  eGalax multi-touch panels.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called egalax_i2c.
+
 config TOUCHSCREEN_FUJITSU
 	tristate "Fujitsu serial touchscreen"
 	select SERIO
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index b4373d6..67ed603 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_TOUCHSCREEN_GUNZE)		+= gunze.o
 obj-$(CONFIG_TOUCHSCREEN_EETI)		+= eeti_ts.o
 obj-$(CONFIG_TOUCHSCREEN_ELAN)		+= elants_i2c.o
 obj-$(CONFIG_TOUCHSCREEN_ELO)		+= elo.o
+obj-$(CONFIG_TOUCHSCREEN_EGALAX_I2C)	+= egalax_i2c.o
 obj-$(CONFIG_TOUCHSCREEN_EGALAX)	+= egalax_ts.o
 obj-$(CONFIG_TOUCHSCREEN_EGALAX_SERIAL)	+= egalax_ts_serial.o
 obj-$(CONFIG_TOUCHSCREEN_FT6236)	+= ft6236.o
diff --git a/drivers/input/touchscreen/egalax_i2c.c b/drivers/input/touchscreen/egalax_i2c.c
new file mode 100644
index 0000000..9ee5566
--- /dev/null
+++ b/drivers/input/touchscreen/egalax_i2c.c
@@ -0,0 +1,961 @@
+/*
+ *
+ * Touch Screen I2C Driver for EETI Controller
+ *
+ * Copyright (C) 2000-2015  eGalax_eMPIA Technology Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#define RELEASE_DATE "2015/04/23"
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/wait.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/device.h>
+#include <asm/uaccess.h>
+#include <linux/kfifo.h>
+#include <linux/version.h>
+#include <linux/input.h>
+#include <linux/irq.h>
+#include <linux/timer.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/miscdevice.h>
+#include <linux/slab.h>
+#include <linux/poll.h>
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,38)
+#include <linux/input/mt.h>
+#endif
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0)
+#include <linux/of_gpio.h>
+#endif
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,8,0)
+	#define __devinit 
+	#define __devexit 
+	#define __devexit_p(x) x
+#endif
+
+#ifdef CONFIG_HAS_EARLYSUSPEND
+	#include <linux/earlysuspend.h>
+	static struct early_suspend egalax_early_suspend;
+#endif
+
+// Global define to enable function
+//#define _SWITCH_XY
+//#define _CONVERT_Y
+
+#define MAX_EVENTS		600
+#define MAX_I2C_LEN		64
+#define FIFO_SIZE		8192 //(PAGE_SIZE*2)
+#define MAX_SUPPORT_POINT	16
+#define REPORTID_MOUSE		0x01
+#define REPORTID_VENDOR		0x03
+#define REPORTID_MTOUCH		0x06//0x04
+#define MAX_RESOLUTION		4095
+
+// running mode
+#define MODE_STOP	0
+#define MODE_WORKING	1
+#define MODE_IDLE	2
+#define MODE_SUSPEND	3
+
+struct tagMTContacts {
+	unsigned char ID;
+	signed char Status;
+	unsigned short X;
+	unsigned short Y;
+};
+
+struct _egalax_i2c {
+	struct workqueue_struct *ktouch_wq;
+	struct work_struct work_irq;
+	struct delayed_work delay_work_ioctl;
+	struct mutex mutex_wq;
+	struct i2c_client *client;
+	unsigned char work_state;
+	unsigned char skip_packet;
+	unsigned int ioctl_cmd;
+	int interrupt_gpio;
+};
+
+struct egalax_char_dev
+{
+	int OpenCnts;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
+	struct kfifo* pDataKFiFo;
+#else
+	struct kfifo DataKFiFo;
+#endif
+	unsigned char *pFiFoBuf;
+	spinlock_t FiFoLock;
+	struct semaphore sem;
+	wait_queue_head_t fifo_inq;
+};
+
+static struct _egalax_i2c *p_egalax_i2c_dev = NULL;	// allocated in egalax_i2c_probe
+static struct egalax_char_dev *p_char_dev = NULL;	// allocated in init_module
+static atomic_t egalax_char_available = ATOMIC_INIT(1);
+static atomic_t wait_command_ack = ATOMIC_INIT(0);
+static struct input_dev *input_dev = NULL;
+static struct tagMTContacts pContactBuf[MAX_SUPPORT_POINT];
+static unsigned char input_report_buf[MAX_I2C_LEN+2];
+
+#define DBG_MODULE	0x00000001
+#define DBG_CDEV	0x00000002
+#define DBG_PROC	0x00000004
+#define DBG_POINT	0x00000008
+#define DBG_INT		0x00000010
+#define DBG_I2C		0x00000020
+#define DBG_SUSP	0x00000040
+#define DBG_INPUT	0x00000080
+#define DBG_CONST	0x00000100
+#define DBG_IDLE	0x00000200
+#define DBG_WAKEUP	0x00000400
+#define DBG_BUTTON	0x00000800
+static unsigned int DbgLevel = DBG_MODULE|DBG_SUSP;
+
+#define PROC_FS_NAME	"egalax_dbg"
+#define PROC_FS_MAX_LEN	8
+static struct proc_dir_entry *dbgProcFile;
+
+#define EGALAX_DBG(level, fmt, args...)  do{ if( (level&DbgLevel)>0 ) \
+					printk( KERN_DEBUG "[egalax_i2c]: " fmt, ## args); }while(0)
+
+static int egalax_I2C_read(unsigned char *pBuf, unsigned short len)
+{
+	struct i2c_msg xfer;
+	unsigned char cmdbuf[2]={0x27, 0x00};
+
+	if(pBuf==NULL)
+		return -1;
+
+	// Write register first
+	xfer.addr = p_egalax_i2c_dev->client->addr;
+	xfer.flags = 0;
+	xfer.len = 2;
+	xfer.buf = cmdbuf;
+	i2c_transfer(p_egalax_i2c_dev->client->adapter, &xfer, 1);
+
+	// Read device data
+	xfer.addr = p_egalax_i2c_dev->client->addr;
+	xfer.flags = I2C_M_RD;
+	xfer.len = len;
+	xfer.buf = pBuf;
+
+	if(i2c_transfer(p_egalax_i2c_dev->client->adapter, &xfer, 1) != 1) 
+	{
+		EGALAX_DBG(DBG_I2C, " %s: i2c transfer fail\n", __func__);
+		return -EIO;
+	}
+	else
+		EGALAX_DBG(DBG_I2C, " %s: i2c transfer success\n", __func__);
+
+	return 0;
+}
+
+static int egalax_I2C_write(unsigned short reg, unsigned char *pBuf, unsigned short len)
+{
+	unsigned char cmdbuf[4+len];
+	struct i2c_msg xfer;
+
+	if(pBuf==NULL)
+		return -1;
+
+	cmdbuf[0] = reg & 0x00FF;
+	cmdbuf[1] = (reg >> 8) & 0x00FF;
+	cmdbuf[2] = (len+2) & 0x00FF;
+	cmdbuf[3] = ((len+2) >> 8) & 0x00FF;
+	memcpy(cmdbuf+4, pBuf, len);
+
+	// Write data to device
+	xfer.addr = p_egalax_i2c_dev->client->addr;
+	xfer.flags = 0;
+	xfer.len = sizeof(cmdbuf);
+	xfer.buf = cmdbuf;
+
+	if(i2c_transfer(p_egalax_i2c_dev->client->adapter, &xfer, 1) != 1) 
+	{
+		EGALAX_DBG(DBG_I2C, " %s: i2c transfer fail\n", __func__);
+		return -EIO;
+	}
+	else
+		EGALAX_DBG(DBG_I2C, " %s: i2c transfer success\n", __func__);
+
+	return 0;
+}
+
+static int egalax_cdev_open(struct inode *inode, struct file *filp)
+{
+	if( !atomic_dec_and_test(&egalax_char_available) )
+	{
+		atomic_inc(&egalax_char_available);
+		return -EBUSY; // already open
+	}
+
+	p_char_dev->OpenCnts++;
+	filp->private_data = p_char_dev;// Used by the read and write metheds
+
+	EGALAX_DBG(DBG_CDEV, " CDev open done!\n");
+	try_module_get(THIS_MODULE);
+	return 0;
+}
+
+static int egalax_cdev_release(struct inode *inode, struct file *filp)
+{
+	struct egalax_char_dev *cdev = filp->private_data;
+
+	atomic_inc(&egalax_char_available); // release the device
+
+	cdev->OpenCnts--;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
+	kfifo_reset( cdev->pDataKFiFo );
+#else
+	kfifo_reset( &cdev->DataKFiFo );
+#endif
+
+	EGALAX_DBG(DBG_CDEV, " CDev release done!\n");
+	module_put(THIS_MODULE);
+	return 0;
+}
+
+static char fifo_read_buf[MAX_I2C_LEN];
+static ssize_t egalax_cdev_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
+{
+	int read_cnt, ret, fifoLen;
+	struct egalax_char_dev *cdev = file->private_data;
+	
+	if( down_interruptible(&cdev->sem) )
+		return -ERESTARTSYS;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
+	fifoLen = kfifo_len(cdev->pDataKFiFo);
+#else
+	fifoLen = kfifo_len(&cdev->DataKFiFo);
+#endif
+
+	while( fifoLen<1 ) // nothing to read
+	{
+		up(&cdev->sem); // release the lock
+		if( file->f_flags & O_NONBLOCK )
+			return -EAGAIN;
+
+	#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
+		if( wait_event_interruptible(cdev->fifo_inq, kfifo_len( cdev->pDataKFiFo )>0) )
+	#else
+		if( wait_event_interruptible(cdev->fifo_inq, kfifo_len( &cdev->DataKFiFo )>0) )
+	#endif
+		{
+			return -ERESTARTSYS; // signal: tell the fs layer to handle it
+		}
+
+		if( down_interruptible(&cdev->sem) )
+			return -ERESTARTSYS;
+	}
+
+	if(count > MAX_I2C_LEN)
+		count = MAX_I2C_LEN;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
+	read_cnt = kfifo_get(cdev->pDataKFiFo, fifo_read_buf, count);
+#else
+	read_cnt = kfifo_out_locked(&cdev->DataKFiFo, fifo_read_buf, count, &cdev->FiFoLock);
+#endif
+	EGALAX_DBG(DBG_CDEV, " \"%s\" reading fifo data count=%d\n", current->comm, read_cnt);
+
+	ret = copy_to_user(buf, fifo_read_buf, read_cnt)?-EFAULT:read_cnt;
+
+	up(&cdev->sem);
+	
+	return ret;
+}
+
+static ssize_t egalax_cdev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
+{
+	struct egalax_char_dev *cdev = file->private_data;
+	int ret=0;
+	char *tmp;
+
+	if( down_interruptible(&cdev->sem) )
+		return -ERESTARTSYS;
+
+	if (count > MAX_I2C_LEN)
+		count = MAX_I2C_LEN;
+
+	tmp = kzalloc(MAX_I2C_LEN, GFP_KERNEL);
+	if(tmp==NULL)
+	{
+		up(&cdev->sem);
+		return -ENOMEM;
+	}
+
+	if(copy_from_user(tmp, buf, count))
+	{
+		up(&cdev->sem);
+		kfree(tmp);
+		return -EFAULT;
+	}
+	
+	ret = egalax_I2C_write(0x0067, tmp, MAX_I2C_LEN);
+
+	up(&cdev->sem);
+	EGALAX_DBG(DBG_CDEV, " I2C writing %zu bytes.\n", count);
+	kfree(tmp);
+
+	return (ret==0?count:-1);
+}
+
+static unsigned int egalax_cdev_poll(struct file *filp, struct poll_table_struct *wait)
+{
+	struct egalax_char_dev *cdev = filp->private_data;
+	unsigned int mask = 0;
+	int fifoLen;
+	
+	down(&cdev->sem);
+	poll_wait(filp, &cdev->fifo_inq,  wait);
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
+	fifoLen = kfifo_len(cdev->pDataKFiFo);
+#else
+	fifoLen = kfifo_len(&cdev->DataKFiFo);
+#endif
+
+	if( fifoLen > 0 )
+		mask |= POLLIN | POLLRDNORM;    /* readable */
+	if( (FIFO_SIZE - fifoLen) > MAX_I2C_LEN )
+		mask |= POLLOUT | POLLWRNORM;   /* writable */
+
+	up(&cdev->sem);
+	return mask;
+}
+
+static int egalax_proc_show(struct seq_file* seqfilp, void *v)
+{
+	seq_printf(seqfilp, "EETI I2C for All Points.\nDebug Level: 0x%08X\nRelease Date: %s\n", DbgLevel, RELEASE_DATE);
+	return 0;
+}
+
+static int egalax_proc_open(struct inode *inode, struct file *filp)
+{
+	EGALAX_DBG(DBG_PROC, " \"%s\" call proc_open\n", current->comm);
+	return single_open(filp, egalax_proc_show, NULL);
+}
+
+static ssize_t egalax_proc_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
+{
+	char procfs_buffer_size = 0; 
+	unsigned char procfs_buf[PROC_FS_MAX_LEN+1] = {0};
+
+	EGALAX_DBG(DBG_PROC, " \"%s\" call proc_write\n", current->comm);
+
+	procfs_buffer_size = count;
+	if(procfs_buffer_size > PROC_FS_MAX_LEN ) 
+		procfs_buffer_size = PROC_FS_MAX_LEN+1;
+	
+	if( copy_from_user(procfs_buf, buf, procfs_buffer_size) ) 
+	{
+		EGALAX_DBG(DBG_PROC, " proc_write faied at copy_from_user\n");
+		return -EFAULT;
+	}
+
+	sscanf(procfs_buf, "%x", &DbgLevel);
+	EGALAX_DBG(DBG_PROC, " Switch Debug Level to 0x%08X\n", DbgLevel);
+
+	return procfs_buffer_size;
+}
+
+#define MAX_POINT_PER_PACKET	5
+#define POINT_STRUCT_SIZE	10
+static int TotalPtsCnt=0, RecvPtsCnt=0;
+static void ProcessReport(unsigned char *buf, struct _egalax_i2c *p_egalax_i2c)
+{
+	unsigned char i, index=0, cnt_down=0, cnt_up=0, shift=0;
+	unsigned char status=0;
+	unsigned short contactID=0, x=0, y=0;
+
+	if(TotalPtsCnt<=0)
+	{
+		if(buf[1]==0 || buf[1]>MAX_SUPPORT_POINT)
+		{
+			EGALAX_DBG(DBG_POINT, " NumsofContacts mismatch, skip packet\n");
+			return;
+		}
+
+		TotalPtsCnt = buf[1];
+		RecvPtsCnt = 0;
+	}
+	else if(buf[1]>0)
+	{
+		TotalPtsCnt = RecvPtsCnt = 0;
+		EGALAX_DBG(DBG_POINT, " NumsofContacts mismatch, skip packet\n");
+		return;
+	}
+
+	while(index<MAX_POINT_PER_PACKET)
+	{
+		shift = index * POINT_STRUCT_SIZE + 2;
+		status = buf[shift] & 0x01;
+		contactID = buf[shift+1];
+		x = ((buf[shift+3]<<8) + buf[shift+2]);
+		y = ((buf[shift+5]<<8) + buf[shift+4]);
+
+		if( contactID>=MAX_SUPPORT_POINT )
+		{
+			TotalPtsCnt = RecvPtsCnt = 0;
+			EGALAX_DBG(DBG_POINT, " Get error ContactID.\n");
+			return;
+		}
+
+		EGALAX_DBG(DBG_POINT, " Get Point[%d] Update: Status=%d X=%d Y=%d\n", contactID, status, x, y);
+
+	#ifdef _SWITCH_XY
+		short tmp = x;
+		x = y;
+		y = tmp;
+	#endif
+	#ifdef _CONVERT_X
+		x = MAX_RESOLUTION-x;
+	#endif
+
+	#ifdef _CONVERT_Y
+		y = MAX_RESOLUTION-y;
+	#endif
+
+		pContactBuf[RecvPtsCnt].ID = contactID;
+		pContactBuf[RecvPtsCnt].Status = status;
+		pContactBuf[RecvPtsCnt].X = x;
+		pContactBuf[RecvPtsCnt].Y = y;
+
+		RecvPtsCnt++;
+		index++;
+
+		// Recv all points, send input report
+		if(RecvPtsCnt==TotalPtsCnt)
+		{
+			for(i=0; i<RecvPtsCnt; i++)
+			{
+			#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,0,0)
+				input_mt_slot(input_dev, pContactBuf[i].ID);
+				input_mt_report_slot_state(input_dev, MT_TOOL_FINGER, pContactBuf[i].Status);
+				if(pContactBuf[i].Status)
+				{
+					input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, pContactBuf[i].Status);
+					input_report_abs(input_dev, ABS_MT_POSITION_X, pContactBuf[i].X);
+					input_report_abs(input_dev, ABS_MT_POSITION_Y, pContactBuf[i].Y);
+				}
+			#else
+				input_report_abs(input_dev, ABS_MT_TRACKING_ID, pContactBuf[i].ID);
+				input_report_abs(input_dev, ABS_MT_TOUCH_MAJOR, pContactBuf[i].Status);
+				input_report_abs(input_dev, ABS_MT_POSITION_X, pContactBuf[i].X);
+				input_report_abs(input_dev, ABS_MT_POSITION_Y, pContactBuf[i].Y);
+				input_report_abs(input_dev, ABS_MT_WIDTH_MAJOR, 0);
+				input_mt_sync(input_dev);
+			#endif
+
+				if(pContactBuf[i].Status)
+					cnt_down++;
+				else
+					cnt_up++;
+			}
+		#ifndef CONFIG_HAS_EARLYSUSPEND //We use this config to distinguish Linux and Android
+			#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,38)
+			input_mt_report_pointer_emulation(input_dev, true);
+			#endif
+		#endif
+			input_sync(input_dev);
+			EGALAX_DBG(DBG_POINT, " Input sync point data done! (Down:%d Up:%d)\n", cnt_down, cnt_up);
+			
+			TotalPtsCnt = RecvPtsCnt = 0;
+			return;
+		}
+	}
+}
+
+static struct input_dev * allocate_Input_Dev(void)
+{
+	int ret;
+	struct input_dev *pInputDev=NULL;
+
+	pInputDev = input_allocate_device();
+	if(pInputDev == NULL)
+	{
+		EGALAX_DBG(DBG_MODULE, " Failed to allocate input device\n");
+		return NULL;//-ENOMEM;
+	}
+
+	pInputDev->name = "eGalax_Touch_Screen";
+	pInputDev->phys = "I2C";
+	pInputDev->id.bustype = BUS_I2C;
+	pInputDev->id.vendor = 0x0EEF;
+	pInputDev->id.product = 0x0020;
+	pInputDev->id.version = 0x0001;
+	
+	set_bit(EV_ABS, pInputDev->evbit);
+#ifndef CONFIG_HAS_EARLYSUSPEND //We use this config to distinguish Linux and Android
+	set_bit(EV_KEY, pInputDev->evbit);
+	__set_bit(BTN_TOUCH, pInputDev->keybit);
+	input_set_abs_params(pInputDev, ABS_X, 0, MAX_RESOLUTION, 0, 0);
+	input_set_abs_params(pInputDev, ABS_Y, 0, MAX_RESOLUTION, 0, 0);
+#endif
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,0,0)
+	__set_bit(INPUT_PROP_DIRECT, pInputDev->propbit);
+	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,0)
+		input_mt_init_slots(pInputDev, MAX_SUPPORT_POINT, 0);
+	#else
+		input_mt_init_slots(pInputDev, MAX_SUPPORT_POINT);
+	#endif
+	input_set_abs_params(pInputDev, ABS_MT_POSITION_X, 0, MAX_RESOLUTION, 0, 0);
+	input_set_abs_params(pInputDev, ABS_MT_POSITION_Y, 0, MAX_RESOLUTION, 0, 0);
+	input_set_abs_params(pInputDev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
+#else
+	input_set_abs_params(pInputDev, ABS_MT_POSITION_X, 0, MAX_RESOLUTION, 0, 0);
+	input_set_abs_params(pInputDev, ABS_MT_POSITION_Y, 0, MAX_RESOLUTION, 0, 0);
+	input_set_abs_params(pInputDev, ABS_MT_WIDTH_MAJOR, 0, MAX_RESOLUTION, 0, 0); //Size
+	input_set_abs_params(pInputDev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0); //Pressure
+	input_set_abs_params(pInputDev, ABS_MT_TRACKING_ID, 0, MAX_SUPPORT_POINT, 0, 0);
+#endif // #if LINUX_VERSION_CODE > KERNEL_VERSION(3,0,0)
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,36)
+	input_set_events_per_packet(pInputDev, MAX_EVENTS);
+#endif
+
+	ret = input_register_device(pInputDev);
+	if(ret) 
+	{
+		EGALAX_DBG(DBG_MODULE, " Unable to register input device.\n");
+		input_free_device(pInputDev);
+		pInputDev = NULL;
+	}
+	
+	return pInputDev;
+}
+
+static int egalax_i2c_measure(struct _egalax_i2c *egalax_i2c)
+{
+	int ret=0, frameLen=0, loop=3, i;
+
+	EGALAX_DBG(DBG_INT, " egalax_i2c_measure\n");
+
+	if( egalax_I2C_read(input_report_buf, MAX_I2C_LEN+2) < 0)
+	{
+		EGALAX_DBG(DBG_I2C, " I2C read input report fail!\n");
+		return -1;
+	}
+	
+	if( DbgLevel&DBG_I2C )
+	{
+		char dbgmsg[(MAX_I2C_LEN+2)*4];
+		for(i=0; i<MAX_I2C_LEN+2; i++)
+			sprintf(dbgmsg+i*4, "[%02X]", input_report_buf[i]);
+		EGALAX_DBG(DBG_I2C, " Buf=%s\n", dbgmsg);
+	}
+
+	frameLen = input_report_buf[0] + (input_report_buf[1]<<8);
+	EGALAX_DBG(DBG_I2C, " I2C read data with Len=%d\n", frameLen);
+
+	if(frameLen==0)
+	{
+		EGALAX_DBG(DBG_MODULE, " Device reset\n");
+		return -1;
+	}
+
+	switch(input_report_buf[2])
+	{
+		case REPORTID_MTOUCH:
+			if( !egalax_i2c->skip_packet && egalax_i2c->work_state==MODE_WORKING )
+				ProcessReport(input_report_buf+2, egalax_i2c);
+			ret = 0;
+			break;
+		case REPORTID_VENDOR:
+			atomic_set(&wait_command_ack, 1);
+			EGALAX_DBG(DBG_I2C, " I2C get vendor command packet\n");
+
+			if( p_char_dev->OpenCnts>0 ) // If someone reading now! put the data into the buffer!
+			{
+				loop=3;
+				do {
+				#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
+					ret = wait_event_timeout(p_char_dev->fifo_inq, (FIFO_SIZE-kfifo_len(p_char_dev->pDataKFiFo))>=MAX_I2C_LEN, HZ);
+				#else
+					ret = wait_event_timeout(p_char_dev->fifo_inq, kfifo_avail(&p_char_dev->DataKFiFo)>=MAX_I2C_LEN, HZ);
+				#endif
+				}while(ret<=0 && --loop);
+
+				if(ret>0) // fifo size is ready
+				{
+				#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
+					ret = kfifo_put(p_char_dev->pDataKFiFo, input_report_buf+2, MAX_I2C_LEN);
+				#else
+					ret = kfifo_in_locked(&p_char_dev->DataKFiFo, input_report_buf+2, MAX_I2C_LEN, &p_char_dev->FiFoLock);
+				#endif
+
+					wake_up_interruptible( &p_char_dev->fifo_inq );
+				}
+				else
+					EGALAX_DBG(DBG_CDEV, " [Warning] Can't write data because fifo size is overflow.\n");
+			}
+
+			break;
+		default:
+			EGALAX_DBG(DBG_I2C, " I2C read error data with hedaer=%d\n", input_report_buf[2]);
+			ret = -1;
+			break;
+	}
+
+	return ret;
+}
+
+static void egalax_i2c_wq_irq(struct work_struct *work)
+{
+	struct _egalax_i2c *egalax_i2c = container_of(work, struct _egalax_i2c, work_irq);
+	struct i2c_client *client = egalax_i2c->client;
+
+	EGALAX_DBG(DBG_INT, " egalax_i2c_wq run\n");
+
+	/*continue recv data*/
+	while( !gpio_get_value(egalax_i2c->interrupt_gpio) )
+	{
+		egalax_i2c_measure(egalax_i2c);
+		schedule();
+	}
+		
+	if( egalax_i2c->skip_packet > 0 )
+		egalax_i2c->skip_packet = 0;
+
+	enable_irq(client->irq);
+
+	EGALAX_DBG(DBG_INT, " egalax_i2c_wq leave\n");
+}
+
+static irqreturn_t egalax_i2c_interrupt(int irq, void *dev_id)
+{
+	struct _egalax_i2c *egalax_i2c = (struct _egalax_i2c *)dev_id;
+
+	EGALAX_DBG(DBG_INT, " INT with irq:%d\n", irq);
+
+	disable_irq_nosync(irq);
+
+	queue_work(egalax_i2c->ktouch_wq, &egalax_i2c->work_irq);
+
+	return IRQ_HANDLED;
+}
+
+#ifdef CONFIG_HAS_EARLYSUSPEND
+static void egalax_i2c_early_suspend(struct early_suspend *handler)
+{
+	pm_message_t state;
+	state.event = PM_EVENT_SUSPEND;
+
+	EGALAX_DBG(DBG_SUSP, " %s\n", __func__);
+	egalax_i2c_pm_suspend(p_egalax_i2c_dev->client, state);
+}
+
+static void egalax_i2c_early_resume(struct early_suspend *handler)
+{
+	EGALAX_DBG(DBG_SUSP, " %s\n", __func__);
+	egalax_i2c_pm_resume(p_egalax_i2c_dev->client);
+}
+#endif // #ifdef CONFIG_HAS_EARLYSUSPEND
+
+static int __devinit egalax_i2c_probe(struct i2c_client *client, const struct i2c_device_id *idp)
+{
+	int ret;
+	struct device_node *devnode;
+	
+	EGALAX_DBG(DBG_MODULE, " Start probe\n");
+
+	p_egalax_i2c_dev = (struct _egalax_i2c *)kzalloc(sizeof(struct _egalax_i2c), GFP_KERNEL);
+	if (!p_egalax_i2c_dev) 
+	{
+		EGALAX_DBG(DBG_MODULE, " Request memory failed\n");
+		ret = -ENOMEM;
+		goto fail1;
+	}
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0)
+	devnode = client->dev.of_node;
+	if(devnode) //if use the device tree config
+	{
+		p_egalax_i2c_dev->interrupt_gpio = of_get_named_gpio(devnode, "int-gpios", 0);
+	}
+#else
+	{
+		p_egalax_i2c_dev->interrupt_gpio = irq_to_gpio(client->irq);
+	}
+#endif
+
+	if( !gpio_is_valid(p_egalax_i2c_dev->interrupt_gpio) )
+	{
+		ret = -ENODEV;
+		goto fail1;
+	}
+	ret = gpio_request(p_egalax_i2c_dev->interrupt_gpio, "Touch IRQ");
+	if(ret<0)
+	{
+		EGALAX_DBG(DBG_MODULE, " gpio_request[%d] failed: %d\n", p_egalax_i2c_dev->interrupt_gpio, ret);
+		if(ret!=-EBUSY)
+			goto fail1;
+	}
+	gpio_direction_input(p_egalax_i2c_dev->interrupt_gpio);
+
+	input_dev = allocate_Input_Dev();
+	if(input_dev==NULL)
+	{
+		EGALAX_DBG(DBG_MODULE, " allocate_Input_Dev failed\n");
+		ret = -EINVAL; 
+		goto fail2;
+	}
+	EGALAX_DBG(DBG_MODULE, " Register input device done\n");
+
+	p_egalax_i2c_dev->client = client;
+	mutex_init(&p_egalax_i2c_dev->mutex_wq);
+
+	p_egalax_i2c_dev->ktouch_wq = create_singlethread_workqueue("egalax_touch_wq");
+	INIT_WORK(&p_egalax_i2c_dev->work_irq, egalax_i2c_wq_irq);
+
+	i2c_set_clientdata(client, p_egalax_i2c_dev);
+
+	if( gpio_get_value(p_egalax_i2c_dev->interrupt_gpio) )
+		p_egalax_i2c_dev->skip_packet = 0;
+	else
+		p_egalax_i2c_dev->skip_packet = 1;
+
+	p_egalax_i2c_dev->work_state = MODE_WORKING;
+
+	ret = request_irq(client->irq, egalax_i2c_interrupt, IRQF_TRIGGER_LOW, client->name, p_egalax_i2c_dev);
+	if( ret ) 
+	{
+		EGALAX_DBG(DBG_MODULE, " Request irq(%d) failed\n", client->irq);
+		goto fail3;
+	}
+	EGALAX_DBG(DBG_MODULE, " Request irq(%d) gpio(%d) with result:%d\n", client->irq, p_egalax_i2c_dev->interrupt_gpio, ret);
+
+#ifdef CONFIG_HAS_EARLYSUSPEND
+	egalax_early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN;
+	egalax_early_suspend.suspend = egalax_i2c_early_suspend;
+	egalax_early_suspend.resume = egalax_i2c_early_resume;
+	register_early_suspend(&egalax_early_suspend);
+	EGALAX_DBG(DBG_MODULE, " Register early_suspend done\n");
+#endif
+
+	EGALAX_DBG(DBG_MODULE, " I2C probe done\n");
+	return 0;
+
+fail3:
+	i2c_set_clientdata(client, NULL);
+	destroy_workqueue(p_egalax_i2c_dev->ktouch_wq); 
+	free_irq(client->irq, p_egalax_i2c_dev);
+	input_unregister_device(input_dev);
+	input_dev = NULL;
+fail2:
+	gpio_free(p_egalax_i2c_dev->interrupt_gpio);
+fail1:
+	kfree(p_egalax_i2c_dev);
+	p_egalax_i2c_dev = NULL;
+
+	EGALAX_DBG(DBG_MODULE, " I2C probe failed\n");
+	return ret;
+}
+
+static int __devexit egalax_i2c_remove(struct i2c_client *client)
+{
+	struct _egalax_i2c *egalax_i2c = i2c_get_clientdata(client);
+
+	egalax_i2c->work_state = MODE_STOP;
+
+	cancel_work_sync(&egalax_i2c->work_irq);
+
+	if(client->irq)
+	{
+		disable_irq(client->irq);
+		free_irq(client->irq, egalax_i2c);
+	}
+
+	gpio_free(egalax_i2c->interrupt_gpio);
+	
+	if(egalax_i2c->ktouch_wq) 
+		destroy_workqueue(egalax_i2c->ktouch_wq); 
+
+#ifdef CONFIG_HAS_EARLYSUSPEND
+	unregister_early_suspend(&egalax_early_suspend);
+#endif
+
+	if(input_dev)
+	{
+		EGALAX_DBG(DBG_MODULE,  " Unregister input device\n");
+		input_unregister_device(input_dev);
+		input_dev = NULL;
+	}
+
+	i2c_set_clientdata(client, NULL);
+	kfree(egalax_i2c);
+	p_egalax_i2c_dev = NULL;
+
+	return 0;
+}
+
+static const struct i2c_device_id egalax_i2c_idtable[] = { 
+	{ "egalax_i2c", 0 }, 
+	{ } 
+};
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0)
+static const struct of_device_id egalax_i2c_dt_ids[] = { 
+	{ .compatible = "eeti,egalax_i2c" }, 
+	{ } 
+};
+#endif
+
+MODULE_DEVICE_TABLE(i2c, egalax_i2c_idtable);
+
+static struct i2c_driver egalax_i2c_driver = {
+	.driver = {
+		.name 	= "egalax_i2c",
+		.owner	= THIS_MODULE,
+	#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,1,0)
+		.of_match_table = egalax_i2c_dt_ids,
+	#endif
+	},
+	.id_table	= egalax_i2c_idtable,
+	.probe		= egalax_i2c_probe,
+	.remove		= __devexit_p(egalax_i2c_remove),
+};
+
+static const struct file_operations egalax_cdev_fops = {
+	.owner	= THIS_MODULE,
+	.read	= egalax_cdev_read,
+	.write	= egalax_cdev_write,
+	.open	= egalax_cdev_open,
+	.release= egalax_cdev_release,
+	.poll	= egalax_cdev_poll,
+};
+
+static const struct file_operations egalax_proc_fops = {
+	.owner		= THIS_MODULE,
+        .open           = egalax_proc_open,
+        .read           = seq_read,
+        .write          = egalax_proc_write,
+        .llseek         = seq_lseek,
+	.release	= single_release,
+};
+
+static struct miscdevice egalax_misc_dev = {
+	.minor = MISC_DYNAMIC_MINOR,
+	.name = "egalax_i2c",
+	.fops = &egalax_cdev_fops,
+};
+
+static void egalax_i2c_ts_exit(void)
+{
+	if(p_char_dev)
+	{
+		if( p_char_dev->pFiFoBuf )
+			kfree(p_char_dev->pFiFoBuf);
+
+		kfree(p_char_dev);
+		p_char_dev = NULL;
+	}
+
+	misc_deregister(&egalax_misc_dev);
+
+	i2c_del_driver(&egalax_i2c_driver);
+
+	remove_proc_entry(PROC_FS_NAME, NULL);
+
+	EGALAX_DBG(DBG_MODULE, " Exit driver done!\n");
+}
+
+static struct egalax_char_dev* setup_chardev(void)
+{
+	struct egalax_char_dev *pCharDev;
+
+	pCharDev = kzalloc(1*sizeof(struct egalax_char_dev), GFP_KERNEL);
+	if(!pCharDev) 
+		goto fail_cdev;
+
+	spin_lock_init( &pCharDev->FiFoLock );
+	pCharDev->pFiFoBuf = kzalloc(sizeof(unsigned char)*FIFO_SIZE, GFP_KERNEL);
+	if(!pCharDev->pFiFoBuf)
+		goto fail_fifobuf;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,33)
+	pCharDev->pDataKFiFo = kfifo_init(pCharDev->pFiFoBuf, FIFO_SIZE, GFP_KERNEL, &pCharDev->FiFoLock);
+	if( pCharDev->pDataKFiFo==NULL )
+		goto fail_kfifo;
+#else
+	kfifo_init(&pCharDev->DataKFiFo, pCharDev->pFiFoBuf, FIFO_SIZE);
+	if( !kfifo_initialized(&pCharDev->DataKFiFo) )
+		goto fail_kfifo;
+#endif
+	
+	pCharDev->OpenCnts = 0;
+	sema_init(&pCharDev->sem, 1);
+	init_waitqueue_head(&pCharDev->fifo_inq);
+
+	return pCharDev; 
+
+fail_kfifo:
+	kfree(pCharDev->pFiFoBuf);
+fail_fifobuf:
+	kfree(pCharDev);
+fail_cdev:
+	return NULL;
+}
+
+static int egalax_i2c_ts_init(void)
+{
+	int result;
+
+	result = misc_register(&egalax_misc_dev);
+	if(result) 
+	{
+		EGALAX_DBG(DBG_MODULE, " misc device register failed\n");
+		goto fail;
+	}
+
+	p_char_dev = setup_chardev(); // allocate the character device
+	if(!p_char_dev) 
+	{
+		result = -ENOMEM;
+		goto fail;
+	}
+
+	dbgProcFile = proc_create(PROC_FS_NAME, S_IRUGO|S_IWUGO, NULL, &egalax_proc_fops);
+	if (dbgProcFile == NULL) 
+	{
+		remove_proc_entry(PROC_FS_NAME, NULL);
+		EGALAX_DBG(DBG_MODULE, " Could not initialize /proc/%s\n", PROC_FS_NAME);
+	}
+
+	EGALAX_DBG(DBG_MODULE, " Driver init done!\n");
+	return i2c_add_driver(&egalax_i2c_driver);
+
+fail:	
+	egalax_i2c_ts_exit();
+	return result;
+}
+
+module_init(egalax_i2c_ts_init);
+module_exit(egalax_i2c_ts_exit);
+
+MODULE_AUTHOR("EETI <touch_fae@eeti.com>");
+MODULE_DESCRIPTION("egalax all points controller i2c driver");
+MODULE_LICENSE("GPL");
-- 
1.9.1