static ssize_t show_out0_ouput(struct device *dev, char *buf)
static ssize_t show_out0_ouput(struct device *dev, struct device_attribute *attr, char *buf)
static ssize_t show_out0_ouput(struct device *dev, char *buf){	struct pcf8591_data *data = i2c_get_clientdata(to_i2c_client(dev));	return sprintf(buf, "%d\n", data->aout * 10);}