From: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Date: Fri, 4 Dec 2020 02:54:58 +0000 (+0300)
Subject: iio: adc: qcom-vadc-common: use fixp_linear_interpolate
X-Git-Tag: microblaze-v5.13~116^2~4^2~7
X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=e2621acd6d9af5b3d5584ddf0fd7994472d6199e;p=linux-2.6-microblaze.git

iio: adc: qcom-vadc-common: use fixp_linear_interpolate

Use new function fixp_linear_interpolate() instead of hand-coding the
linear interpolation.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20201204025509.1075506-5-dmitry.baryshkov@linaro.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---

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;