cx231xx_gpio_i2c_write_byte
status = cx231xx_gpio_i2c_write_byte(dev, (dev_addr << 1) + 1);
cx231xx_gpio_i2c_write_byte(dev, dev_addr << 1);
cx231xx_gpio_i2c_write_byte(dev, buf[i]);
int cx231xx_gpio_i2c_write_byte(struct cx231xx *dev, u8 data);