LM93_REG_PWM_RAMP_CTL
ramp = lm93_read_byte(client, LM93_REG_PWM_RAMP_CTL);
lm93_write_byte(client, LM93_REG_PWM_RAMP_CTL, ramp);
ramp = lm93_read_byte(client, LM93_REG_PWM_RAMP_CTL);
lm93_write_byte(client, LM93_REG_PWM_RAMP_CTL, ramp);
data->pwm_ramp_ctl = lm93_read_byte(client, LM93_REG_PWM_RAMP_CTL);