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    thermal: generic-adc: Fix adc to temp interpolation · ec8f73c2
    Bjorn Andersson 提交于
    [ Upstream commit 9d216211fded20fff301d0317af3238d8383634c ]
    
    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: NBjorn Andersson <bjorn.andersson@linaro.org>
    Signed-off-by: NEduardo Valentin <edubezval@gmail.com>
    Signed-off-by: NSasha Levin <sashal@kernel.org>
    ec8f73c2
thermal-generic-adc.c 4.0 KB