| Message ID | 20200903132109.1914011-5-dmitry.baryshkov@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | None | expand |
On Thu, Sep 3, 2020 at 5:33 PM Dmitry Baryshkov <dmitry.baryshkov@linaro.org> wrote: > > Use new function fixp_linear_interpolate() instead of hand-coding the > linar interpolation. ... > /* result is between search_index and search_index-1 */ > /* interpolate linearly */ > - *output = (((s32)((pts[i].y - pts[i - 1].y) * > - (input - pts[i - 1].x)) / > - (pts[i].x - pts[i - 1].x)) + > - pts[i - 1].y); > + *output = fixp_linear_interpolate(pts[i - 1].x, pts[i - 1].y, > + pts[i].x, pts[i].y, > + input); I'm wondering if it's related to linear_range.h API https://elixir.bootlin.com/linux/latest/source/include/linux/linear_range.h > } > > return 0; -- With Best Regards, Andy Shevchenko
diff --git a/drivers/iio/adc/qcom-vadc-common.c b/drivers/iio/adc/qcom-vadc-common.c index d11f3343ad52..40d77b3af1bb 100644 --- a/drivers/iio/adc/qcom-vadc-common.c +++ b/drivers/iio/adc/qcom-vadc-common.c @@ -2,6 +2,7 @@ #include <linux/bug.h> #include <linux/kernel.h> #include <linux/bitops.h> +#include <linux/fixp-arith.h> #include <linux/math64.h> #include <linux/log2.h> #include <linux/err.h> @@ -368,10 +369,9 @@ static int qcom_vadc_map_voltage_temp(const struct vadc_map_pt *pts, } else { /* result is between search_index and search_index-1 */ /* interpolate linearly */ - *output = (((s32)((pts[i].y - pts[i - 1].y) * - (input - pts[i - 1].x)) / - (pts[i].x - pts[i - 1].x)) + - pts[i - 1].y); + *output = fixp_linear_interpolate(pts[i - 1].x, pts[i - 1].y, + pts[i].x, pts[i].y, + input); } return 0;
Use new function fixp_linear_interpolate() instead of hand-coding the linar interpolation. Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> --- drivers/iio/adc/qcom-vadc-common.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) -- 2.28.0