linux-kernel - [PATCH v4 3/5] hwmon: (ina2xx) replace ina226_avg_bits() with find

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Message-Id: <1426786065-9798-4-git-send-email-bgolaszewski@baylibre.com>
Date:	Thu, 19 Mar 2015 18:27:43 +0100
From:	Bartosz Golaszewski <bgolaszewski@...libre.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Guenter Roeck <linux@...ck-us.net>,
	lm-sensors <lm-sensors@...sensors.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH v4 3/5] hwmon: (ina2xx) replace ina226_avg_bits() with find_closest()

Use find_closest() to locate the closest average in ina226_avg_tab.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@...libre.com>
---
 drivers/hwmon/ina2xx.c | 17 +++--------------
 1 file changed, 3 insertions(+), 14 deletions(-)

diff --git a/drivers/hwmon/ina2xx.c b/drivers/hwmon/ina2xx.c
index d1542b7..4d28150 100644
--- a/drivers/hwmon/ina2xx.c
+++ b/drivers/hwmon/ina2xx.c
@@ -36,6 +36,7 @@
 #include <linux/jiffies.h>
 #include <linux/of.h>
 #include <linux/delay.h>
+#include <linux/util_macros.h>
 
 #include <linux/platform_data/ina2xx.h>
 
@@ -141,19 +142,6 @@ static const struct ina2xx_config ina2xx_config[] = {
  */
 static const int ina226_avg_tab[] = { 1, 4, 16, 64, 128, 256, 512, 1024 };
 
-static int ina226_avg_bits(int avg)
-{
-	int i;
-
-	/* Get the closest average from the tab. */
-	for (i = 0; i < ARRAY_SIZE(ina226_avg_tab) - 1; i++) {
-		if (avg <= (ina226_avg_tab[i] + ina226_avg_tab[i + 1]) / 2)
-			break;
-	}
-
-	return i; /* Return 0b0111 for values greater than 1024. */
-}
-
 static int ina226_reg_to_interval(u16 config)
 {
 	int avg = ina226_avg_tab[INA226_READ_AVG(config)];
@@ -171,7 +159,8 @@ static u16 ina226_interval_to_reg(int interval, u16 config)
 
 	avg = DIV_ROUND_CLOSEST(interval * 1000,
 				INA226_TOTAL_CONV_TIME_DEFAULT);
-	avg_bits = ina226_avg_bits(avg);
+	avg_bits = find_closest(avg, ina226_avg_tab,
+				ARRAY_SIZE(ina226_avg_tab));
 
 	return (config & ~INA226_AVG_RD_MASK) | INA226_SHIFT_AVG(avg_bits);
 }
-- 
2.1.4

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