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Subject[PATCH 3/5] devfreq: Add devm_devfreq_{register,unregister}_opp_notfier function
Date
This patch add resource-managed function for devfreq opp as following
functions. The devm_devfreq_register_opp_notifier() manages automatically
the registration of devfreq opp using device resource management.
- devm_devfreq_register_opp_notifier
- devm_devfreq_unregister_opp_notifier()

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
---
drivers/devfreq/devfreq.c | 48 +++++++++++++++++++++++++++++++++++++++++++++++
include/linux/devfreq.h | 14 ++++++++++++++
2 files changed, 62 insertions(+)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 0b80b60..3439406 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -1293,6 +1293,54 @@ int devfreq_unregister_opp_notifier(struct device *dev, struct devfreq *devfreq)
return ret;
}

+static void devm_devfreq_opp_release(struct device *dev, void *res)
+{
+ devfreq_unregister_opp_notifier(dev, *(struct devfreq **)res);
+}
+
+/**
+ * devm_ devfreq_register_opp_notifier()
+ * - Resource-managed devfreq_register_opp_notifier()
+ * @dev: The devfreq user device. (parent of devfreq)
+ * @devfreq: The devfreq object.
+ */
+int devm_devfreq_register_opp_notifier(struct device *dev,
+ struct devfreq *devfreq)
+{
+ struct devfreq **ptr;
+ int ret;
+
+ ptr = devres_alloc(devm_devfreq_opp_release, sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return -ENOMEM;
+
+ ret = devfreq_register_opp_notifier(dev, devfreq);
+ if (ret) {
+ devres_free(ptr);
+ return ret;
+ }
+
+ *ptr = devfreq;
+ devres_add(dev, ptr);
+
+ return 0;
+}
+EXPORT_SYMBOL(devm_devfreq_register_opp_notifier);
+
+/**
+ * devm_devfreq_unregister_opp_notifier()
+ * - Resource-managed devfreq_unregister_opp_notifier()
+ * @dev: The devfreq user device. (parent of devfreq)
+ * @devfreq: The devfreq object.
+ */
+void devm_devfreq_unregister_opp_notifier(struct device *dev,
+ struct devfreq *devfreq)
+{
+ WARN_ON(devres_release(dev, devm_devfreq_opp_release,
+ devm_devfreq_dev_match, devfreq));
+}
+EXPORT_SYMBOL(devm_devfreq_unregister_opp_notifier);
+
MODULE_AUTHOR("MyungJoo Ham <myungjoo.ham@samsung.com>");
MODULE_DESCRIPTION("devfreq class support");
MODULE_LICENSE("GPL");
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index 45c29db..90f95a3 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -241,6 +241,10 @@ extern int devfreq_register_opp_notifier(struct device *dev,
struct devfreq *devfreq);
extern int devfreq_unregister_opp_notifier(struct device *dev,
struct devfreq *devfreq);
+extern int devm_devfreq_register_opp_notifier(struct device *dev,
+ struct devfreq *devfreq);
+extern void devm_devfreq_unregister_opp_notifier(struct device *dev,
+ struct devfreq *devfreq);

#if IS_ENABLED(CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND)
/**
@@ -317,6 +321,16 @@ static inline int devfreq_unregister_opp_notifier(struct device *dev,
return -EINVAL;
}

+static inline int devm_devfreq_register_opp_notifier(struct device *dev,
+ struct devfreq *devfreq)
+{
+ return -EINVAL;
+}
+
+static inline void devm_devfreq_unregister_opp_notifier(struct device *dev,
+ struct devfreq *devfreq)
+{
+}
#endif /* CONFIG_PM_DEVFREQ */

#endif /* __LINUX_DEVFREQ_H__ */
--
1.8.0


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