[PATCH 4/4] Return the fan speed via sysfs

[Goffredo Baroncelli <kreijack@gmail.com>]

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

This patch is copied from the Bryan Christianson's patch (see
debian bug #741663)

Signed-off-by: Goffredo Baroncelli <kreijack@inwind.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 0c4eb85..a2af7db 100644
--- a/drivers/macintosh/therm_windtunnel.c
+++ b/drivers/macintosh/therm_windtunnel.c
@@ -111,9 +111,15 @@ 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 );
 
 
 /************************************************************************/
@@ -265,6 +271,7 @@ 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");
@@ -275,6 +282,7 @@ 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 );
-- 
2.0.1