thermal: add new get_crit_temp callback

Add a new callback so that the generic thermal can get
the critical trip point info of a thermal zone,
which is needed for building the tempX_crit hwmon sysfs attribute.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Len Brown <len.brown@intel.com>

2 files changed, 14 insertions, 0 deletions

diff --git a/drivers/acpi/thermal.c b/drivers/acpi/thermal.c
index 766bd25d3376..ec707ed1a70f 100644
--- a/drivers/acpi/thermal.c
+++ b/drivers/acpi/thermal.c
@@ -1012,6 +1012,18 @@ static int thermal_get_trip_temp(struct thermal_zone_device *thermal,
         return -EINVAL;
 }
 
+static int thermal_get_crit_temp(struct thermal_zone_device *thermal,
+                                unsigned long *temperature) {
+        struct acpi_thermal *tz = thermal->devdata;
+
+        if (tz->trips.critical.flags.valid) {
+                *temperature = KELVIN_TO_MILLICELSIUS(
+                                tz->trips.critical.temperature);
+                return 0;
+        } else
+                return -EINVAL;
+}
+
 typedef int (*cb)(struct thermal_zone_device *, int,
                   struct thermal_cooling_device *);
 static int acpi_thermal_cooling_device_cb(struct thermal_zone_device *thermal,
@@ -1103,6 +1115,7 @@ static struct thermal_zone_device_ops acpi_thermal_zone_ops = {
         .set_mode = thermal_set_mode,
         .get_trip_type = thermal_get_trip_type,
         .get_trip_temp = thermal_get_trip_temp,
+        .get_crit_temp = thermal_get_crit_temp,
 };
 
 static int acpi_thermal_register_thermal_zone(struct acpi_thermal *tz)
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 3ff680b44e81..16e6a8bdeb3c 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -41,6 +41,7 @@ struct thermal_zone_device_ops {
         int (*set_mode) (struct thermal_zone_device *, const char *);
         int (*get_trip_type) (struct thermal_zone_device *, int, char *);
         int (*get_trip_temp) (struct thermal_zone_device *, int, char *);
+        int (*get_crit_temp) (struct thermal_zone_device *, unsigned long *);
 };
 
 struct thermal_cooling_device_ops {