• Bjorn Andersson's avatar
    thermal: generic-adc: Fix adc to temp interpolation · 9d216211
    Bjorn Andersson authored
    First correct the edge case to return the last element if we're
    outside the range, rather than at the last element, so that
    interpolation is not omitted for points between the two last entries in
    the table.
    Then correct the formula to perform linear interpolation based the two
    points surrounding the read ADC value. The indices for temp are kept as
    "hi" and "lo" to pair with the adc indices, but there's no requirement
    that the temperature is provided in descendent order. mult_frac() is
    used to prevent issues with overflowing the int.
    Cc: Laxman Dewangan <ldewangan@nvidia.com>
    Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
    Signed-off-by: default avatarEduardo Valentin <edubezval@gmail.com>
thermal-generic-adc.c 4.01 KB