linux-kernel - [PATCH 4/5] Return the fan speed via sysfs

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Message-Id: <1407567003-18332-5-git-send-email-kreijack@inwind.it>
Date:	Sat,  9 Aug 2014 06:50:02 +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>,
	Guenter Roeck <linux@...ck-us.net>,
	Goffredo Baroncelli <kreijack@...ind.it>
Subject: [PATCH 4/5] Return the fan speed via sysfs

Return the fan speed via sysfs:
/sys/devices/temperature/fan_level

This patch is extracted from a Bryan Christianson's bigger one (see
debian bug #741663)

Signed-off-by: Goffredo Baroncelli <kreijack@...ind.it>
---
 drivers/macintosh/therm_windtunnel.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/macintosh/therm_windtunnel.c b/drivers/macintosh/therm_windtunnel.c
index 68f1067..30a6588 100644
--- a/drivers/macintosh/therm_windtunnel.c
+++ b/drivers/macintosh/therm_windtunnel.c
@@ -109,9 +109,15 @@ show_case_temperature( struct device *dev, struct device_attribute *attr, char *
 	return sprintf(buf, "%d.%d\n", x.casetemp>>8, (x.casetemp & 255)*10/256 );
 }
 
+static ssize_t
+show_fan_level(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%d\n", 11 - x.fan_level);
+}
+
 static DEVICE_ATTR(cpu_temperature, S_IRUGO, show_cpu_temperature, NULL );
 static DEVICE_ATTR(case_temperature, S_IRUGO, show_case_temperature, NULL );
-
+static DEVICE_ATTR(fan_level, S_IRUGO, show_fan_level, NULL);
 
 
 /************************************************************************/
@@ -264,6 +270,7 @@ setup_hardware( void )
 
 	err = device_create_file( &x.of_dev->dev, &dev_attr_cpu_temperature );
 	err |= device_create_file( &x.of_dev->dev, &dev_attr_case_temperature );
+	err |= device_create_file(&x.of_dev->dev, &dev_attr_fan_level);
 	if (err)
 		printk(KERN_WARNING
 			"Failed to create temperature attribute file(s).\n");
@@ -274,6 +281,7 @@ restore_regs( void )
 {
 	device_remove_file( &x.of_dev->dev, &dev_attr_cpu_temperature );
 	device_remove_file( &x.of_dev->dev, &dev_attr_case_temperature );
+	device_remove_file(&x.of_dev->dev, &dev_attr_fan_level);
 
 	write_reg( x.fan, 0x01, x.r1, 1 );
 	write_reg( x.fan, 0x20, x.r20, 1 );
-- 
2.1.0.rc1

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