ADXRS290_REG_POWER_CTL
ret = spi_w8r8(st->spi, ADXRS290_READ_REG(ADXRS290_REG_POWER_CTL));
ret = adxrs290_spi_write_reg(st->spi, ADXRS290_REG_POWER_CTL, val);
ret = adxrs290_spi_write_reg(spi, ADXRS290_REG_POWER_CTL,