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Message-Id: <1407567003-18332-6-git-send-email-kreijack@inwind.it>
Date: Sat, 9 Aug 2014 06:50:03 +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 5/5] Export the temperatures via hwmon
Export the temperature via the hwmon subsystem.
See the list below for the sensors exported:
$ cd /sys/devices/temperature/hwmon/hwmon0
$ echo "name: $(cat name)"; for i in temp*; do echo "$i: $(cat $i)"; done
name: therm_windtunnel
temp1_input: 59312
temp1_label: CPU
temp2_input: 36750
temp2_label: Case
temp3_input: 37750
temp3_label: Case2
The Case2 temperature is the sensor temperature inside the adm1030.
Signed-off-by: Goffredo Baroncelli <kreijack@...ind.it>
---
drivers/macintosh/therm_windtunnel.c | 96 ++++++++++++++++++++++++++++++++++--
1 file changed, 92 insertions(+), 4 deletions(-)
diff --git a/drivers/macintosh/therm_windtunnel.c b/drivers/macintosh/therm_windtunnel.c
index 30a6588..fd9061d 100644
--- a/drivers/macintosh/therm_windtunnel.c
+++ b/drivers/macintosh/therm_windtunnel.c
@@ -37,6 +37,8 @@
#include <linux/init.h>
#include <linux/kthread.h>
#include <linux/of_platform.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
#include <asm/prom.h>
#include <asm/machdep.h>
@@ -58,9 +60,12 @@ static struct {
struct i2c_client *thermostat;
struct i2c_client *fan;
+ struct device *hwmon;
+
int overheat_temp; /* 100% fan at this temp */
int overheat_hyst;
int temp;
+ int casetemp2;
int casetemp;
int fan_level; /* active fan_table setting */
@@ -120,6 +125,66 @@ static DEVICE_ATTR(case_temperature, S_IRUGO, show_case_temperature, NULL );
static DEVICE_ATTR(fan_level, S_IRUGO, show_fan_level, NULL);
+static ssize_t
+show_temp1(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%d%03d\n", x.temp>>8,
+ (x.temp & 0xff) * 1000 / 256);
+}
+
+static ssize_t
+show_temp1_label(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "CPU\n");
+}
+
+static ssize_t
+show_temp2(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%d%03d\n", x.casetemp>>8,
+ (x.casetemp & 0xff) * 1000 / 256);
+}
+
+static ssize_t
+show_temp2_label(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "Case\n");
+}
+
+
+static ssize_t
+show_temp3(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%d%03d\n", x.casetemp2>>8,
+ (x.casetemp2 & 0xff) * 1000 / 256);
+}
+
+static ssize_t
+show_temp3_label(struct device *dev, struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "Case2\n");
+}
+
+static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp1, NULL);
+static DEVICE_ATTR(temp1_label, S_IRUGO, show_temp1_label, NULL);
+static DEVICE_ATTR(temp2_input, S_IRUGO, show_temp2, NULL);
+static DEVICE_ATTR(temp2_label, S_IRUGO, show_temp2_label, NULL);
+static DEVICE_ATTR(temp3_input, S_IRUGO, show_temp3, NULL);
+static DEVICE_ATTR(temp3_label, S_IRUGO, show_temp3_label, NULL);
+
+static struct attribute *therm_windtunnel_attrs[] = {
+ &dev_attr_temp1_input.attr,
+ &dev_attr_temp1_label.attr,
+ &dev_attr_temp2_input.attr,
+ &dev_attr_temp2_label.attr,
+ &dev_attr_temp3_input.attr,
+ &dev_attr_temp3_label.attr,
+
+ NULL,
+};
+
+ATTRIBUTE_GROUPS(therm_windtunnel);
+
/************************************************************************/
/* controller thread */
/************************************************************************/
@@ -172,16 +237,23 @@ tune_fan( int fan_setting )
static void
poll_temp( void )
{
- int temp, i, level, casetemp, tempchanged;
+ int temp, i, level, casetemp, tempchanged, casetemp2, reg06;
+ /* temperature read from ds1775 */
temp = read_reg( x.thermostat, 0, 2 );
/* this actually occurs when the computer is loaded */
if( temp < 0 )
return;
- casetemp = read_reg(x.fan, 0x0b, 1) << 8;
- casetemp |= (read_reg(x.fan, 0x06, 1) & 0x7) << 5;
+ /*
+ * temperatures read from the adm1030
+ * casetemp is the external temperature sensor
+ * casetemp2 is the internal temperature sensor
+ */
+ reg06 = read_reg(x.fan, 0x06, 1);
+ casetemp = (read_reg(x.fan, 0x0b, 1) << 8) | (reg06 & 0x07 << 5);
+ casetemp2 = (read_reg(x.fan, 0x0a, 1) << 8) | (reg06 & 0xc0);
level = -1;
for( i=0; (temp & 0xffff) > fan_table[i].temp ; i++ )
@@ -200,12 +272,15 @@ poll_temp( void )
* if verbose >=1 log each fan tuning
* if verbose >=2 log each cpu temperature change
*/
- tempchanged = x.temp != temp || x.casetemp != casetemp;
+ tempchanged = x.temp != temp || x.casetemp != casetemp ||
+ x.casetemp2 != casetemp2;
if ((verbose > 1 && tempchanged) ||
(verbose > 0 && level >= 0)) {
print_temp(KERN_INFO "CPU-temp: ", temp);
if (casetemp)
print_temp(", Case: ", casetemp);
+ if (casetemp2)
+ print_temp(", Case2: ", casetemp2);
if (level >= 0)
printk(", Fan: %d (tuned %+d)\n", 11-level,
x.fan_level-level);
@@ -215,6 +290,7 @@ poll_temp( void )
x.temp = temp;
x.casetemp = casetemp;
+ x.casetemp2 = casetemp2;
if( level >= 0 )
tune_fan( level );
@@ -274,11 +350,23 @@ setup_hardware( void )
if (err)
printk(KERN_WARNING
"Failed to create temperature attribute file(s).\n");
+
+ x.hwmon = hwmon_device_register_with_groups(&x.of_dev->dev,
+ "therm_windtunnel", NULL,
+ therm_windtunnel_groups);
+ if (IS_ERR(x.hwmon)) {
+ dev_warn(&x.of_dev->dev, "Failed to create the hwmon device\n");
+ x.hwmon = NULL;
+ }
}
static void
restore_regs( void )
{
+ if (x.hwmon)
+ hwmon_device_unregister(x.hwmon);
+ x.hwmon = NULL;
+
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);
--
2.1.0.rc1
--
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