Add apis for platform thermal drivers to query for slope and offset
attributes, which might be needed for temperature calculations.
Signed-off-by: Rajendra Nayak <rnayak@xxxxxxxxxxxxxx>
---
Documentation/thermal/sysfs-api.txt | 12 ++++++++++++
drivers/thermal/thermal_core.c | 30 ++++++++++++++++++++++++++++++
include/linux/thermal.h | 8 ++++++++
3 files changed, 50 insertions(+)
diff --git a/Documentation/thermal/sysfs-api.txt b/Documentation/thermal/sysfs-api.txt
index ed419d6..3450cb0 100644
--- a/Documentation/thermal/sysfs-api.txt
+++ b/Documentation/thermal/sysfs-api.txt
@@ -140,6 +140,18 @@ temperature) and throttle appropriate devices.
Normally this function will not need to be called and the resource
management code will ensure that the resource is freed.
+1.1.7 int thermal_zone_get_slope(struct thermal_zone_device *tz)
+
+ This interface is used to read the slope attribute value
+ for the thermal zone device, which might be useful for platform
+ drivers for temperature calculations.
+
+1.1.8 int thermal_zone_get_offset(struct thermal_zone_device *tz)
+
+ This interface is used to read the offset attribute value
+ for the thermal zone device, which might be useful for platform
+ drivers for temperature calculations.
+
1.2 thermal cooling device interface
1.2.1 struct thermal_cooling_device *thermal_cooling_device_register(char *name,
void *devdata, struct thermal_cooling_device_ops *)
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 5133cd1..b118aae 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -2065,6 +2065,36 @@ exit:
}
EXPORT_SYMBOL_GPL(thermal_zone_get_zone_by_name);
+/**
+ * thermal_zone_get_slope - return the slope attribute of the thermal zone
+ * @tz: thermal zone device with the slope attribute
+ *
+ * Return: If the thermal zone device has a slope attribute, return it, else
+ * return 1.
+ */
+int thermal_zone_get_slope(struct thermal_zone_device *tz)
+{
+ if (tz && tz->tzp)
+ return tz->tzp->slope;
+ return 1;
+}
+EXPORT_SYMBOL_GPL(thermal_zone_get_slope);
+
+/**
+ * thermal_zone_get_offset - return the offset attribute of the thermal zone
+ * @tz: thermal zone device with the offset attribute
+ *
+ * Return: If the thermal zone device has a offset attribute, return it, else
+ * return 0.
+ */
+int thermal_zone_get_offset(struct thermal_zone_device *tz)
+{
+ if (tz && tz->tzp)
+ return tz->tzp->offset;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(thermal_zone_get_offset);
+
#ifdef CONFIG_NET
static const struct genl_multicast_group thermal_event_mcgrps[] = {
{ .name = THERMAL_GENL_MCAST_GROUP_NAME, },
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index 1b8a5a7..fd206b9 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -432,6 +432,8 @@ thermal_of_cooling_device_register(struct device_node *np, char *, void *,
void thermal_cooling_device_unregister(struct thermal_cooling_device *);
struct thermal_zone_device *thermal_zone_get_zone_by_name(const char *name);
int thermal_zone_get_temp(struct thermal_zone_device *tz, int *temp);
+int thermal_zone_get_slope(struct thermal_zone_device *tz);
+int thermal_zone_get_offset(struct thermal_zone_device *tz);
int get_tz_trend(struct thermal_zone_device *, int);
struct thermal_instance *get_thermal_instance(struct thermal_zone_device *,
@@ -489,6 +491,12 @@ static inline struct thermal_zone_device *thermal_zone_get_zone_by_name(
static inline int thermal_zone_get_temp(
struct thermal_zone_device *tz, int *temp)
{ return -ENODEV; }
+static inline int thermal_zone_get_slope(
+ struct thermal_zone_device *tz)
+{ return -ENODEV; }
+static inline int thermal_zone_get_offset(
+ struct thermal_zone_device *tz)
+{ return -ENODEV; }
static inline int get_tz_trend(struct thermal_zone_device *tz, int trip)
{ return -ENODEV; }
static inline struct thermal_instance *
--
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