I2C_PCF_ES1
set_pcf(adap, 1, I2C_PCF_PIN | I2C_PCF_ES1);
if ((temp & 0x7f) != I2C_PCF_ES1)
#define I2C_PCF_CLKREG I2C_PCF_ES1
writeb(I2C_PCF_PIN | I2C_PCF_ES1, bp->i2c_control_regs + 0x0);
writeb(I2C_PCF_PIN | I2C_PCF_ES1, bp->i2c_control_regs + 0x0);