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From: Linus Walleij <linus.walleij@linaro.org>
To: Sebastian Reichel <sre@kernel.org>, Marcus Cooper <codekipper@gmail.com>
Cc: linux-pm@vger.kernel.org, Linus Walleij <linus.walleij@linaro.org>
Subject: [PATCH 1/5] power: supply: ab8500: Use library interpolation
Date: Tue, 13 Jul 2021 17:27:05 +0200	[thread overview]
Message-ID: <20210713152709.871833-1-linus.walleij@linaro.org> (raw)

The kernel already has a static inline for linear interpolation
so use that instead of rolling our own.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/power/supply/ab8500_btemp.c |  6 ++++--
 drivers/power/supply/ab8500_fg.c    | 14 +++++++-------
 2 files changed, 11 insertions(+), 9 deletions(-)

diff --git a/drivers/power/supply/ab8500_btemp.c b/drivers/power/supply/ab8500_btemp.c
index dbdcff32f353..24958b935d39 100644
--- a/drivers/power/supply/ab8500_btemp.c
+++ b/drivers/power/supply/ab8500_btemp.c
@@ -27,6 +27,7 @@
 #include <linux/mfd/abx500.h>
 #include <linux/mfd/abx500/ab8500.h>
 #include <linux/iio/consumer.h>
+#include <linux/fixp-arith.h>
 
 #include "ab8500-bm.h"
 
@@ -437,8 +438,9 @@ static int ab8500_btemp_res_to_temp(struct ab8500_btemp *di,
 			i++;
 	}
 
-	return tbl[i].temp + ((tbl[i + 1].temp - tbl[i].temp) *
-		(res - tbl[i].resist)) / (tbl[i + 1].resist - tbl[i].resist);
+	return fixp_linear_interpolate(tbl[i].resist, tbl[i].temp,
+				       tbl[i + 1].resist, tbl[i + 1].temp,
+				       res);
 }
 
 /**
diff --git a/drivers/power/supply/ab8500_fg.c b/drivers/power/supply/ab8500_fg.c
index 3d45ed0157c6..bdbf3f13bee0 100644
--- a/drivers/power/supply/ab8500_fg.c
+++ b/drivers/power/supply/ab8500_fg.c
@@ -34,6 +34,7 @@
 #include <linux/mfd/abx500/ab8500.h>
 #include <linux/iio/consumer.h>
 #include <linux/kernel.h>
+#include <linux/fixp-arith.h>
 
 #include "ab8500-bm.h"
 
@@ -56,9 +57,6 @@
 /* FG constants */
 #define BATT_OVV			0x01
 
-#define interpolate(x, x1, y1, x2, y2) \
-	((y1) + ((((y2) - (y1)) * ((x) - (x1))) / ((x2) - (x1))));
-
 /**
  * struct ab8500_fg_interrupts - ab8500 fg interrupts
  * @name:	name of the interrupt
@@ -868,11 +866,12 @@ static int ab8500_fg_volt_to_capacity(struct ab8500_fg *di, int voltage)
 	}
 
 	if ((i > 0) && (i < tbl_size)) {
-		cap = interpolate(voltage,
+		cap = fixp_linear_interpolate(
 			tbl[i].voltage,
 			tbl[i].capacity * 10,
 			tbl[i-1].voltage,
-			tbl[i-1].capacity * 10);
+			tbl[i-1].capacity * 10,
+			voltage);
 	} else if (i == 0) {
 		cap = 1000;
 	} else {
@@ -920,11 +919,12 @@ static int ab8500_fg_battery_resistance(struct ab8500_fg *di)
 	}
 
 	if ((i > 0) && (i < tbl_size)) {
-		resist = interpolate(di->bat_temp / 10,
+		resist = fixp_linear_interpolate(
 			tbl[i].temp,
 			tbl[i].resist,
 			tbl[i-1].temp,
-			tbl[i-1].resist);
+			tbl[i-1].resist,
+			di->bat_temp / 10);
 	} else if (i == 0) {
 		resist = tbl[0].resist;
 	} else {
-- 
2.31.1


             reply	other threads:[~2021-07-13 15:29 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-13 15:27 Linus Walleij [this message]
2021-07-13 15:27 ` [PATCH 2/5] power: supply: ab8500: Rename charging algorithm symbols Linus Walleij
2021-07-13 15:27 ` [PATCH 3/5] power: supply: ab8500: Drop abx500 concept Linus Walleij
2021-07-13 15:27 ` [PATCH 4/5] power: supply: ab8500: Rename charging algorithm psy Linus Walleij
2021-07-13 15:27 ` [PATCH 5/5] power: supply: ab8500: Drop some includes from bmdata Linus Walleij
2021-07-16 13:58 ` [PATCH 1/5] power: supply: ab8500: Use library interpolation Sebastian Reichel

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