LM93_REG_SF_TACH_TO_PWM
data->sf_tach_to_pwm = lm93_read_byte(client, LM93_REG_SF_TACH_TO_PWM);
lm93_write_byte(client, LM93_REG_SF_TACH_TO_PWM, data->sf_tach_to_pwm);
int mapping = lm93_read_byte(client, LM93_REG_SF_TACH_TO_PWM);
LM93_REG_SF_TACH_TO_PWM);