//---------------IIC的linux驱动------------------
#include
#include
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#include /* printk() */
#include /* kmalloc() */
#include /* everything... */
#include /* error codes */
#include /* size_t */
#include
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#include
//#include
#include
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#include
#include
//#include

#include
#include
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#include
//#include


volatile int f_nGetACK;
#define UINT unsigned int

#define I2C_MAGIC 'k'
#define I2C_set _IO(I2C_MAGIC,1)

#define I2C_MAJOR 259
#define DEVICE_NAME "s3c2410_I2C"

MODULE_LICENSE("GPL");
MODULE_AUTHOR("caogos");
MODULE_DESCRIPTION("s3c2410 I2C");

char data[128]="\0";


#define rGPECON *(volatile unsigned int *)S3C2410_GPECON

#if 0
#define S3C2410_I2C(x) (S3C2410_IICREG(x))

#define S3C2410_IICCON S3C2410_I2C(0x00)
#define S3C2410_IICSTAT S3C2410_I2C(0x04)
#define S3C2410_IICADD S3C2410_I2C(0x08)
#define S3C2410_IICDS S3C2410_I2C(0x0c)

#define rIICCON *(volatile unsigned int *)S3C2410_IICCON
#define rIICSTAT *(volatile unsigned int *)S3C2410_IICSTAT
#define rIICADD *(volatile unsigned int *)S3C2410_IICADD
#define rIICDS *(volatile unsigned int *)S3C2410_IICDS
#define rGPECON *(volatile unsigned int *)S3C2410_GPECON
#else

#define rIICCON *(volatile unsigned int *)i2c_base
#define rIICSTAT *(volatile unsigned int *)((unsigned int)i2c_base + 4)
#define rIICADD *(volatile unsigned int *)((unsigned int)i2c_base + 8)
#define rIICDS *(volatile unsigned int *)((unsigned int)i2c_base + 0xc)

static volatile void __iomem *i2c_base;
static struct resource *area = NULL;
#endif

#define CLKCON 0x4c00000c
static volatile unsigned int *clkcon;
static int I2C_major = I2C_MAJOR;
static struct cdev I2C_cdev;

// IIC interrupt handler
static irqreturn_t iic_int_24c04(int irq,void *dev_id,struct pt_regs *regs)
{
//ClearPending(BIT_IIC);
f_nGetACK = 1;
return IRQ_HANDLED ;
}


// write data to 24C040
void iic_write_24c040(UINT unSlaveAddr,UINT unAddr,UINT ucData)
{
f_nGetACK = 0;

// Send control byte
rIICDS = unSlaveAddr; // 0xa0 slave设备地址，由硬件的原理图决定
rIICSTAT = 0xf0; // Master Tx,Start
while(f_nGetACK == 0);// Wait ACK //这个标志在邋錓IC中断处理函数中被修改
f_nGetACK = 0;

//Send address
rIICDS = unAddr; //数据在slave设备的存放地址
rIICCON = 0xaf; // Resumes IIC operation.
while(f_nGetACK == 0);// Wait ACK
f_nGetACK = 0;

rIICDS = ucData; // 向slave设备写的数据
rIICCON = 0xaf; / Resumes IIC operation.
// printk("4444444\n");
while(f_nGetACK == 0);// Wait ACK
f_nGetACK = 0;

// End send
rIICSTAT = 0xd0; // Stop Master Tx condition
rIICCON = 0xaf; // Resumes IIC operation.
// Wait until stop condtion is in effect.
mdelay(10); // 这个延时时间查slave设备的资料，
//如果是EEPROM的话，这个延时时间被slave设备用来写数据(将通过iic传送给slave设备的数据写到EEPROM中)
}


// read data from 24C040
void iic_read_24c040(UINT unSlaveAddr,UINT unAddr,unsigned char *pData)
{
char cRecvByte;

f_nGetACK = 0;

//Send control byte
rIICDS = unSlaveAddr; // 0xa0
rIICSTAT = 0xf0; // Master Tx,Start

while(f_nGetACK == 0);// Wait ACK
f_nGetACK = 0;

// Send address
rIICDS = unAddr;
rIICCON = 0xaf; // Resumes IIC opera