fixp-arith: add a linear interpolation function
Adds a function to interpolate against two points, this is carried arount as a helper function by tons of drivers. Signed-off-by: Craig Tatlor <ctatlor97@gmail.com> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Link: https://lore.kernel.org/r/20201204025509.1075506-3-dmitry.baryshkov@linaro.org Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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@ -141,4 +141,23 @@ static inline s32 fixp_sin32_rad(u32 radians, u32 twopi)
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#define fixp_cos32_rad(rad, twopi) \
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fixp_sin32_rad(rad + twopi / 4, twopi)
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/**
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* fixp_linear_interpolate() - interpolates a value from two known points
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*
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* @x0: x value of point 0
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* @y0: y value of point 0
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* @x1: x value of point 1
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* @y1: y value of point 1
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* @x: the linear interpolant
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*/
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static inline int fixp_linear_interpolate(int x0, int y0, int x1, int y1, int x)
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{
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if (y0 == y1 || x == x0)
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return y0;
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if (x1 == x0 || x == x1)
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return y1;
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return y0 + ((y1 - y0) * (x - x0) / (x1 - x0));
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}
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#endif
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