请大家帮我看一下iic驱动程序写函数有什么问题啊？SCL和SDA老师保持为高电平　

  我的I2C驱动程序，很简单的一个字符设备驱动，但是不知道为什么SCL和SDA老师保持为高电平，请大虾们帮我看一下我的写函数有什么问题啊？
#define IICCON  __REG2(0x54000000,4)
#define IICSTAT __REG2(0x54000004,4)
#define IICADD  __REG2(0x54000008,4)
#define IICDS   __REG2(0x5400000c,4)
static char iic_Data[IICBUFSIZE];
static volatile int iic_DataCount;
static unsigned int old_gpecon,old_gpeup;      //use to save GPECON GPEUP

//端口初始化
static void s3c2410_io_port_init(void)
{
   old_gpecon   = GPECON;
   old_gpeup  = GPEUP;
   GPEUP  |= 0xc000;                  //Pull-up disable
   GPECON |= 0xa00000;                //GPE15:IICSDA , GPE14:IICSCL

   INTMSK &= ~(BIT_IIC);

     //Enable ACK, Prescaler IICCLK=PCLK/16, Enable interrupt, Transmit clock value Tx clock=IICCLK/16
     // If PCLK 50.7MHz, IICCLK = 3.17MHz, Tx Clock = 0.198MHz
   IICCON = (1<<7) | (0<<6) | (1<<5) | (0xf);

   IICADD  = 0x10;                    //2410 slave address = [7:1]
   IICSTAT = 0x10;                    //IIC bus data output enable(Rx/Tx)
}

static int s3c2410_write(struct file * file,const char * buffer, size_t count, loff_t *ppos)
{

int i;
iic_DataCount=count;
   printk("WRITE\n");
   copy_from_user(iic_Data,buffer,count);
   IICDS   = slave_addr;                 //0xa0
   IICSTAT = 0xf0;                    //MasTx,Start

if(IICSTAT&0x1) {};
for(i=0;i<iic_DataCount;i++)
{
IICDS     = iic_Data;
   IICSTAT   = 0xf0;              //MasTx,Start
       IICCON    = 0xaf;              //Resumes II operation.
if(IICSTAT&0x1) {};
   }
   IICSTAT = 0xd0;                    //Stop MasTx condition
   IICCON  = 0xaf;                    //Resumes IIC operation.
   udelay(1);                           //Wait until stop condtion is in effect.
return 0;
}