This patch adds a policy sysfs attribute to a thermal zone.
This attribute will give us the throttling policy used
for the zone. This is a RO attribute.
Signed-off-by: Durgadoss R <durgadoss.r@xxxxxxxxx>
---
drivers/thermal/thermal_sys.c | 40 ++++++++++++++++++++++++++++++++++++++++
include/linux/thermal.h | 1 +
2 files changed, 41 insertions(+)
diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c
index 243a3f0..195e529 100644
--- a/drivers/thermal/thermal_sys.c
+++ b/drivers/thermal/thermal_sys.c
@@ -411,6 +411,27 @@ passive_show(struct device *dev, struct device_attribute *attr,
return sprintf(buf, "%d\n", tz->forced_passive);
}
+static ssize_t show_throttle_policy(struct device *dev,
+ struct device_attribute *devattr, char *buf)
+{
+ struct thermal_zone_device *tz = to_thermal_zone(dev);
+ struct thermal_zone_params *tzp = tz->tzp;
+
+ if (!tzp)
+ return sprintf(buf, "step_wise(default)\n");
+
+ switch (tzp->throttle_policy) {
+ case THERMAL_FAIR_SHARE:
+ return sprintf(buf, "fair_share\n");
+ case THERMAL_STEP_WISE:
+ return sprintf(buf, "step_wise\n");
+ case THERMAL_USER_SPACE:
+ return sprintf(buf, "user_space\n");
+ default:
+ return sprintf(buf, "unknown\n");
+ }
+}
+
static DEVICE_ATTR(type, 0444, type_show, NULL);
static DEVICE_ATTR(temp, 0444, temp_show, NULL);
static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
@@ -1269,6 +1290,15 @@ leave:
}
EXPORT_SYMBOL(thermal_zone_device_update);
+static int create_policy_attr(struct thermal_zone_device *tz)
+{
+ sysfs_attr_init(&tz->policy_attr.attr);
+ tz->policy_attr.attr.name = "throttle_policy";
+ tz->policy_attr.attr.mode = S_IRUGO | S_IWUSR;
+ tz->policy_attr.show = show_throttle_policy;
+ return device_create_file(&tz->device, &tz->policy_attr);
+}
+
/**
* create_trip_attrs - create attributes for trip points
* @tz: the thermal zone device
@@ -1479,6 +1509,14 @@ struct thermal_zone_device *thermal_zone_device_register(const char *type,
/* Retrieve platform level parameters for this zone */
retrieve_zone_params(tz);
+ result = create_policy_attr(tz);
+ if (result) {
+ dev_err(&tz->device,
+ "create_policy_attr for zone %s failed:%d\n",
+ tz->type, result);
+ goto unregister;
+ }
+
mutex_lock(&thermal_list_lock);
list_add_tail(&tz->node, &thermal_tz_list);
if (ops->bind)
@@ -1539,6 +1577,8 @@ void thermal_zone_device_unregister(struct thermal_zone_device *tz)
device_remove_file(&tz->device, &dev_attr_mode);
remove_trip_attrs(tz);
+ device_remove_file(&tz->device, &tz->policy_attr);
+
thermal_remove_hwmon_sysfs(tz);
release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
idr_destroy(&tz->idr);
diff --git a/include/linux/thermal.h b/include/linux/thermal.h
index f9ce1e2..1d49f05 100644
--- a/include/linux/thermal.h
+++ b/include/linux/thermal.h
@@ -173,6 +173,7 @@ struct thermal_zone_device {
struct list_head node;
struct delayed_work poll_queue;
struct thermal_zone_params *tzp;
+ struct device_attribute policy_attr;
};
/*
--
1.7.9.5
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