hwmon: (coretemp) Add maximum cooling temperature readout

Following patch will add reporting of maximum temperature, at which all fans
should spin full speed. It may be non-physical temperature on Desktop/Server CPUs.

Signed-off-by: Rudolf Marek <r.marek@assembler.cz>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>

diff --git a/Documentation/hwmon/coretemp b/Documentation/hwmon/coretemp
index 170bf86..7fb7441 100644 (file)
--- a/Documentation/hwmon/coretemp
+++ b/Documentation/hwmon/coretemp
@@ -25,7 +25,8 @@ may be raised, if the temperature grows enough (more than TjMax) to trigger
 the Out-Of-Spec bit. Following table summarizes the exported sysfs files:
 
 temp1_input     - Core temperature (in millidegrees Celsius).
-temp1_crit      - Maximum junction temperature  (in millidegrees Celsius).
+temp1_max       - All cooling devices should be turned on (on Core2).
+temp1_crit      - Maximum junction temperature (in millidegrees Celsius).
 temp1_crit_alarm - Set when Out-of-spec bit is set, never clears.
                   Correct CPU operation is no longer guaranteed.
 temp1_label     - Contains string "Core X", where X is processor

diff --git a/drivers/hwmon/coretemp.c b/drivers/hwmon/coretemp.c
index 3ee60d2..52914e9 100644 (file)
--- a/drivers/hwmon/coretemp.c
+++ b/drivers/hwmon/coretemp.c
@@ -38,7 +38,8 @@
 
 #define DRVNAME        "coretemp"
 
-typedef enum { SHOW_TEMP, SHOW_TJMAX, SHOW_LABEL, SHOW_NAME } SHOW;
+typedef enum { SHOW_TEMP, SHOW_TJMAX, SHOW_TTARGET, SHOW_LABEL,
+               SHOW_NAME } SHOW;
 
 /*
  * Functions declaration
@@ -55,6 +56,7 @@ struct coretemp_data {
        unsigned long last_updated;     /* in jiffies */
        int temp;
        int tjmax;
+       int ttarget;
        u8 alarm;
 };
 
@@ -93,9 +95,10 @@ static ssize_t show_temp(struct device *dev,
 
        if (attr->index == SHOW_TEMP)
                err = data->valid ? sprintf(buf, "%d\n", data->temp) : -EAGAIN;
-       else
+       else if (attr->index == SHOW_TJMAX)
                err = sprintf(buf, "%d\n", data->tjmax);
-
+       else
+               err = sprintf(buf, "%d\n", data->ttarget);
        return err;
 }
 
@@ -103,6 +106,8 @@ static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, show_temp, NULL,
                          SHOW_TEMP);
 static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO, show_temp, NULL,
                          SHOW_TJMAX);
+static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO, show_temp, NULL,
+                         SHOW_TTARGET);
 static DEVICE_ATTR(temp1_crit_alarm, S_IRUGO, show_alarm, NULL);
 static SENSOR_DEVICE_ATTR(temp1_label, S_IRUGO, show_name, NULL, SHOW_LABEL);
 static SENSOR_DEVICE_ATTR(name, S_IRUGO, show_name, NULL, SHOW_NAME);
@@ -223,8 +228,26 @@ static int __devinit coretemp_probe(struct platform_device *pdev)
 
        platform_set_drvdata(pdev, data);
 
+       /* read the still undocumented IA32_TEMPERATURE_TARGET it exists
+          on older CPUs but not in this register */
+
+       if (c->x86_model > 0xe) {
+               err = rdmsr_safe_on_cpu(data->id, 0x1a2, &eax, &edx);
+               if (err) {
+                       dev_warn(&pdev->dev, "Unable to read"
+                                       " IA32_TEMPERATURE_TARGET MSR\n");
+               } else {
+                       data->ttarget = data->tjmax -
+                                       (((eax >> 8) & 0xff) * 1000);
+                       err = device_create_file(&pdev->dev,
+                                       &sensor_dev_attr_temp1_max.dev_attr);
+                       if (err)
+                               goto exit_free;
+               }
+       }
+
        if ((err = sysfs_create_group(&pdev->dev.kobj, &coretemp_group)))
-               goto exit_free;
+               goto exit_dev;
 
        data->hwmon_dev = hwmon_device_register(&pdev->dev);
        if (IS_ERR(data->hwmon_dev)) {
@@ -238,6 +261,8 @@ static int __devinit coretemp_probe(struct platform_device *pdev)
 
 exit_class:
        sysfs_remove_group(&pdev->dev.kobj, &coretemp_group);
+exit_dev:
+       device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr);
 exit_free:
        kfree(data);
 exit:
@@ -250,6 +275,7 @@ static int __devexit coretemp_remove(struct platform_device *pdev)
 
        hwmon_device_unregister(data->hwmon_dev);
        sysfs_remove_group(&pdev->dev.kobj, &coretemp_group);
+       device_remove_file(&pdev->dev, &sensor_dev_attr_temp1_max.dev_attr);
        platform_set_drvdata(pdev, NULL);
        kfree(data);
        return 0;