| Message ID | 20200910140000.324091-4-dmitry.baryshkov@linaro.org (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | qcom: pm8150: add support for thermal monitoring | expand |
On Thu, 10 Sep 2020 16:59:53 +0300 Dmitry Baryshkov <dmitry.baryshkov@linaro.org> wrote: > From: Craig Tatlor <ctatlor97@gmail.com> > > 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> Seems sensible to have this. Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> > --- > include/linux/fixp-arith.h | 19 +++++++++++++++++++ > 1 file changed, 19 insertions(+) > > diff --git a/include/linux/fixp-arith.h b/include/linux/fixp-arith.h > index 8396013785ef..281cb4f83dbe 100644 > --- a/include/linux/fixp-arith.h > +++ b/include/linux/fixp-arith.h > @@ -141,4 +141,23 @@ static inline s32 fixp_sin32_rad(u32 radians, u32 twopi) > #define fixp_cos32_rad(rad, twopi) \ > fixp_sin32_rad(rad + twopi / 4, twopi) > > +/** > + * fixp_linear_interpolate() - interpolates a value from two known points > + * > + * @x0: x value of point 0 > + * @y0: y value of point 0 > + * @x1: x value of point 1 > + * @y1: y value of point 1 > + * @x: the linear interpolant > + */ > +static inline int fixp_linear_interpolate(int x0, int y0, int x1, int y1, int x) > +{ > + if (y0 == y1 || x == x0) > + return y0; > + if (x1 == x0 || x == x1) > + return y1; > + > + return y0 + ((y1 - y0) * (x - x0) / (x1 - x0)); > +} > + > #endif
diff --git a/include/linux/fixp-arith.h b/include/linux/fixp-arith.h index 8396013785ef..281cb4f83dbe 100644 --- a/include/linux/fixp-arith.h +++ b/include/linux/fixp-arith.h @@ -141,4 +141,23 @@ static inline s32 fixp_sin32_rad(u32 radians, u32 twopi) #define fixp_cos32_rad(rad, twopi) \ fixp_sin32_rad(rad + twopi / 4, twopi) +/** + * fixp_linear_interpolate() - interpolates a value from two known points + * + * @x0: x value of point 0 + * @y0: y value of point 0 + * @x1: x value of point 1 + * @y1: y value of point 1 + * @x: the linear interpolant + */ +static inline int fixp_linear_interpolate(int x0, int y0, int x1, int y1, int x) +{ + if (y0 == y1 || x == x0) + return y0; + if (x1 == x0 || x == x1) + return y1; + + return y0 + ((y1 - y0) * (x - x0) / (x1 - x0)); +} + #endif