From: Jean Delvare <khali@linux-fr.org>
Date: Fri, 17 Oct 2008 15:51:13 +0000 (+0200)
Subject: hwmon: (lm85) Select the closest PWM frequency
X-Git-Tag: v2.6.28-rc1~259^2~28
X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=86010c982db2030aad2c31f178b208964f5f6806;hp=34e7dc6ca4a663a1bb0a0a4e118426849dccd72d;p=linux-2.6-omap-h63xx.git

hwmon: (lm85) Select the closest PWM frequency

The LM85 and compatible chips only support 8 arbitrary PWM frequencies.
The algorithm to pick one of them based on the user input is not
optimum. Improve it to always pick the closest supported frequency.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Herbert Poetzl <herbert@13thfloor.at>
---

diff --git a/drivers/hwmon/lm85.c b/drivers/hwmon/lm85.c
index 6b676df3547..c323c2b8980 100644
--- a/drivers/hwmon/lm85.c
+++ b/drivers/hwmon/lm85.c
@@ -199,10 +199,9 @@ static int FREQ_TO_REG(int freq)
 {
 	int i;
 
-	if (freq >= lm85_freq_map[7])
-		return 7;
+	/* Find the closest match */
 	for (i = 0; i < 7; ++i)
-		if (freq <= lm85_freq_map[i])
+		if (freq <= (lm85_freq_map[i] + lm85_freq_map[i + 1]) / 2)
 			break;
 	return i;
 }