linux-kernel - [PATCH 3/5] Add the "verbose" module option.

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Message-Id: <1407438518-4395-4-git-send-email-kreijack@inwind.it>
Date:	Thu,  7 Aug 2014 19:08:36 +0000
From:	Goffredo Baroncelli <kreijack@...il.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Jean Delvare <jdelvare@...e.de>,
	Goffredo Baroncelli <kreijack@...ind.it>
Subject: [PATCH 3/5] Add the "verbose" module option.

Add a "verbose" option to control the message in the kernel log
verbose = 0   no message
verbose = 1   log only the fan speed changes
verbose = 2   log the fan speed changes and the temperature changes

Signed-off-by: Goffredo Baroncelli <kreijack@...ind.it>
---
 drivers/macintosh/therm_windtunnel.c | 38 +++++++++++++++++++++++-------------
 1 file changed, 24 insertions(+), 14 deletions(-)

diff --git a/drivers/macintosh/therm_windtunnel.c b/drivers/macintosh/therm_windtunnel.c
index 1e50455..68f1067 100644
--- a/drivers/macintosh/therm_windtunnel.c
+++ b/drivers/macintosh/therm_windtunnel.c
@@ -44,7 +44,9 @@
 #include <asm/sections.h>
 #include <asm/macio.h>
 
-#define LOG_TEMP		0			/* continuously log temperature */
+static int verbose = 1;
+module_param(verbose, int, 0644);
+MODULE_PARM_DESC(verbose, "Verbosity level: 0=silent, 1=log the fan tuning, 2=log the temperature");
 
 static struct {
 	volatile int		running;
@@ -157,10 +159,6 @@ tune_fan( int fan_setting )
 	/* write_reg( x.fan, 0x24, val, 1 ); */
 	write_reg( x.fan, 0x25, val, 1 );
 	write_reg( x.fan, 0x20, 0, 1 );
-	print_temp("CPU-temp: ", x.temp );
-	if( x.casetemp )
-		print_temp(", Case: ", x.casetemp );
-	printk(",  Fan: %d (tuned %+d)\n", 11-fan_setting, x.fan_level-fan_setting );
 
 	x.fan_level = fan_setting;
 }
@@ -168,7 +166,7 @@ tune_fan( int fan_setting )
 static void
 poll_temp( void )
 {
-	int temp, i, level, casetemp;
+	int temp, i, level, casetemp, tempchanged;
 
 	temp = read_reg( x.thermostat, 0, 2 );
 
@@ -179,14 +177,6 @@ poll_temp( void )
 	casetemp = read_reg(x.fan, 0x0b, 1) << 8;
 	casetemp |= (read_reg(x.fan, 0x06, 1) & 0x7) << 5;
 
-	if( LOG_TEMP && x.temp != temp ) {
-		print_temp("CPU-temp: ", temp );
-		print_temp(", Case: ", casetemp );
-		printk(",  Fan: %d\n", 11-x.fan_level );
-	}
-	x.temp = temp;
-	x.casetemp = casetemp;
-
 	level = -1;
 	for( i=0; (temp & 0xffff) > fan_table[i].temp ; i++ )
 		;
@@ -200,6 +190,26 @@ poll_temp( void )
 		level = fan_table[i].fan_up_setting;
 	x.upind = i;
 
+	/*
+	 * if verbose >=1 log each fan tuning
+	 * if verbose >=2 log each cpu temperature change
+	 */
+	tempchanged = x.temp != temp || x.casetemp != casetemp;
+	if ((verbose > 1 && tempchanged) ||
+	    (verbose > 0 && level >= 0)) {
+		print_temp(KERN_INFO "CPU-temp: ", temp);
+		if (casetemp)
+			print_temp(", Case: ", casetemp);
+		if (level >= 0)
+			printk(", Fan: %d (tuned %+d)\n", 11-level,
+				x.fan_level-level);
+		else
+			printk(", Fan: %d\n", 11-x.fan_level);
+	}
+
+	x.temp = temp;
+	x.casetemp = casetemp;
+
 	if( level >= 0 )
 		tune_fan( level );
 }
-- 
2.0.1

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