[RFC PATCHv3 2/7] devfreq: event: Add the list of supported devfreq-event type

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This patch adds the list of supported devfreq-event type as following.
Each devfreq-event device driver would support the various devfreq-event type
for devfreq governor at the same time.
- DEVFREQ_EVENT_TYPE_RAW_DATA
- DEVFREQ_EVENT_TYPE_UTILIZATION
- DEVFREQ_EVENT_TYPE_BANDWIDTH
- DEVFREQ_EVENT_TYPE_LATENCY

Cc: MyungJoo Ham <myungjoo.ham@xxxxxxxxxxx>
Cc: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
---
 drivers/devfreq/devfreq-event.c | 44 +++++++++++++++++++++++++++++++++++++----
 include/linux/devfreq.h         | 29 ++++++++++++++++++++++-----
 2 files changed, 64 insertions(+), 9 deletions(-)

diff --git a/drivers/devfreq/devfreq-event.c b/drivers/devfreq/devfreq-event.c
index eaf59c1..9444f93 100644
--- a/drivers/devfreq/devfreq-event.c
+++ b/drivers/devfreq/devfreq-event.c
@@ -29,6 +29,9 @@
 #include <linux/of.h>
 #include "governor.h"
 
+#define EVENT_TYPE_RAW_DATA_MAX		U64_MAX
+#define EVENT_TYPE_UTILIZATION_MAX	100
+
 static struct class *devfreq_event_class;
 
 /* The list of all devfreq event list */
@@ -144,7 +147,8 @@ EXPORT_SYMBOL_GPL(devfreq_event_is_enabled);
  * Note that this function set the event to the devfreq-event device to start
  * for getting the event data which could be various event type.
  */
-int devfreq_event_set_event(struct devfreq_event_dev *edev)
+int devfreq_event_set_event(struct devfreq_event_dev *edev,
+				enum devfreq_event_type type)
 {
 	int ret;
 
@@ -158,7 +162,15 @@ int devfreq_event_set_event(struct devfreq_event_dev *edev)
 		return -EPERM;
 
 	mutex_lock(&edev->lock);
-	ret = edev->desc->ops->set_event(edev);
+
+	if ((edev->desc->type & type) == 0) {
+		dev_err(&edev->dev, "unsupported of devfreq-event type\n");
+		mutex_unlock(&edev->lock);
+		return -EINVAL;
+	}
+
+	ret = edev->desc->ops->set_event(edev, type);
+
 	mutex_unlock(&edev->lock);
 
 	return ret;
@@ -174,7 +186,9 @@ EXPORT_SYMBOL_GPL(devfreq_event_set_event);
  * current event data and total_event should be stored in second parameter
  * (total_event).
  */
-u64 devfreq_event_get_event(struct devfreq_event_dev *edev, u64 *total_event)
+u64 devfreq_event_get_event(struct devfreq_event_dev *edev,
+				enum devfreq_event_type type,
+				u64 *total_event)
 {
 	u64 event;
 
@@ -190,7 +204,27 @@ u64 devfreq_event_get_event(struct devfreq_event_dev *edev, u64 *total_event)
 		return 0;
 
 	mutex_lock(&edev->lock);
-	event = edev->desc->ops->get_event(edev, total_event);
+
+	if ((edev->desc->type & type) == 0) {
+		dev_err(&edev->dev, "unsupported of devfreq-event type\n");
+		return -EINVAL;
+	}
+
+	event = edev->desc->ops->get_event(edev, type, total_event);
+
+	switch (type) {
+	case DEVFREQ_EVENT_TYPE_RAW_DATA:
+	case DEVFREQ_EVENT_TYPE_BANDWIDTH:
+	case DEVFREQ_EVENT_TYPE_LATENCY:
+		if ((event > *total_event)
+			|| ((event > EVENT_TYPE_RAW_DATA_MAX) ||
+				*total_event > EVENT_TYPE_RAW_DATA_MAX))
+			event = 0;
+	case DEVFREQ_EVENT_TYPE_UTILIZATION:
+		if (event > EVENT_TYPE_UTILIZATION_MAX)
+			event = 0;
+	}
+
 	mutex_unlock(&edev->lock);
 
 	return event;
@@ -215,8 +249,10 @@ int devfreq_event_reset_event(struct devfreq_event_dev *edev)
 		return -EPERM;
 
 	mutex_lock(&edev->lock);
+
 	if (edev->desc->ops && edev->desc->ops->reset)
 		ret = edev->desc->ops->reset(edev);
+
 	mutex_unlock(&edev->lock);
 
 	if (ret < 0)
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index a8d2277..82da235 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -197,6 +197,14 @@ struct devfreq_event_dev {
 	const struct devfreq_event_desc *desc;
 };
 
+/* The supported type by devfreq-event device */
+enum devfreq_event_type {
+	DEVFREQ_EVENT_TYPE_RAW_DATA	= BIT(0),
+	DEVFREQ_EVENT_TYPE_UTILIZATION	= BIT(1),
+	DEVFREQ_EVENT_TYPE_BANDWIDTH	= BIT(2),
+	DEVFREQ_EVENT_TYPE_LATENCY	= BIT(3),
+};
+
 /**
  * struct devfreq_event_ops - the operations of devfreq-event device
  *
@@ -219,8 +227,10 @@ struct devfreq_event_ops {
 	int (*reset)(struct devfreq_event_dev *event_dev);
 
 	/* Mandatory functions */
-	int (*set_event)(struct devfreq_event_dev *event_dev);
-	u64 (*get_event)(struct devfreq_event_dev *event_dev, u64 *total_event);
+	int (*set_event)(struct devfreq_event_dev *event_dev,
+			enum devfreq_event_type type);
+	u64 (*get_event)(struct devfreq_event_dev *event_dev,
+			enum devfreq_event_type type, u64 *total_event);
 };
 
 /**
@@ -228,6 +238,10 @@ struct devfreq_event_ops {
  *
  * @name	: the name of devfreq-event device.
  * @driver_data	: the private data for devfreq-event driver.
+ * @event_type	: the supported devfreq-event type among as following
+ *		  - DEVFREQ_EVENT_TYPE_UTILIZATION
+ *		  - DEVFREQ_EVENT_TYPE_BANDWIDTH
+ *		  - DEVFREQ_EVENT_TYPE_LATENCY
  * @ops		: the operation to control devfreq-event device.
  *
  * Each devfreq-event device is described with a this structure.
@@ -236,6 +250,7 @@ struct devfreq_event_ops {
 struct devfreq_event_desc {
 	const char *name;
 	void *driver_data;
+	enum devfreq_event_type type;
 
 	struct devfreq_event_ops *ops;
 };
@@ -273,8 +288,10 @@ extern void devm_devfreq_unregister_opp_notifier(struct device *dev,
 extern int devfreq_event_enable_edev(struct devfreq_event_dev *edev);
 extern int devfreq_event_disable_edev(struct devfreq_event_dev *edev);
 extern bool devfreq_event_is_enabled(struct devfreq_event_dev *edev);
-extern int devfreq_event_set_event(struct devfreq_event_dev *edev);
+extern int devfreq_event_set_event(struct devfreq_event_dev *edev,
+				enum devfreq_event_type type);
 extern u64 devfreq_event_get_event(struct devfreq_event_dev *edev,
+				enum devfreq_event_type type,
 				u64 *total_event);
 extern int devfreq_event_reset_event(struct devfreq_event_dev *edev);
 extern void *devfreq_event_get_drvdata(struct devfreq_event_dev *edev);
@@ -397,13 +414,15 @@ static inline bool devfreq_event_is_enabled(struct devfreq_event_dev *edev);
 	return false;
 }
 
-static inline int devfreq_event_set_event(struct devfreq_event_dev *edev);
+static inline int devfreq_event_set_event(struct devfreq_event_dev *edev,
+					enum devfreq_event_type type)
 {
 	return -EINVAL;
 }
 
 static inline u64 devfreq_event_get_event(struct devfreq_event_dev *edev
-					u64 *total_event);
+					enum devfreq_event_type type,
+					u64 *total_event)
 {
 	return 0;
 }
-- 
1.8.5.5

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