linux-kernel - [PATCHv2 2/9] extcon: Add devm_extcon_dev_allocate/free to manage the resource of extcon device

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Date:	Mon, 21 Apr 2014 21:02:15 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	myungjoo.ham@...sung.com, balbi@...com, gg@...mlogic.co.uk,
	kishon@...com, ckeepax@...nsource.wolfsonmicro.com,
	broonie@...nel.org, k.kozlowski@...sung.com,
	kyungmin.park@...sung.com, Chanwoo Choi <cw00.choi@...sung.com>
Subject: [PATCHv2 2/9] extcon: Add devm_extcon_dev_allocate/free to manage the
 resource of extcon device

This patch add device managed devm_extcon_dev_{allocate,free} to automatically
free the memory of extcon_dev structure without handling free operation.

Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
---
 drivers/extcon/extcon-class.c | 46 +++++++++++++++++++++++++++++++++++++++++++
 include/linux/extcon.h        | 11 +++++++++++
 2 files changed, 57 insertions(+)

diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c
index 3e485bc..677c502 100644
--- a/drivers/extcon/extcon-class.c
+++ b/drivers/extcon/extcon-class.c
@@ -848,6 +848,11 @@ void extcon_dev_free(struct extcon_dev *edev)
 }
 EXPORT_SYMBOL_GPL(extcon_dev_free);
 
+static void devm_extcon_dev_release(struct device *dev, void *res)
+{
+	extcon_dev_free(*(struct extcon_dev **)res);
+}
+
 static void devm_extcon_dev_unreg(struct device *dev, void *res)
 {
 	extcon_dev_unregister(*(struct extcon_dev **)res);
@@ -866,6 +871,47 @@ static int devm_extcon_dev_match(struct device *dev, void *res, void *data)
 }
 
 /**
+ * devm_extcon_dev_allocate - Allocate managed extcon device
+ * @dev:		device owning the extcon device being created
+ * @supported_cable:	Array of supported cable names ending with NULL.
+ *			If supported_cable is NULL, cable name related APIs
+ *			are disabled.
+ *
+ * This function manages automatically the memory of extcon device using device
+ * resource management and simplify the control of freeing the memory of extcon
+ * device.
+ *
+ * Returns the pointer memory of allocated extcon_dev if success or NULL if fail
+ */
+struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
+					    const char **supported_cable)
+{
+	struct extcon_dev **ptr, *edev;
+
+	ptr = devres_alloc(devm_extcon_dev_release, sizeof(*ptr), GFP_KERNEL);
+	if (!ptr)
+		return NULL;
+
+	edev = extcon_dev_allocate(supported_cable);
+	if (!IS_ERR(edev)) {
+		*ptr = edev;
+		devres_add(dev, ptr);
+	} else {
+		devres_free(ptr);
+	}
+
+	return edev;
+}
+EXPORT_SYMBOL_GPL(devm_extcon_dev_allocate);
+
+void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev)
+{
+	WARN_ON(devres_release(dev, devm_extcon_dev_release,
+			       devm_extcon_dev_match, edev));
+}
+EXPORT_SYMBOL_GPL(devm_extcon_dev_free);
+
+/**
  * devm_extcon_dev_register() - Resource-managed extcon_dev_register()
  * @dev:	device to allocate extcon device
  * @edev:	the new extcon device to register
diff --git a/include/linux/extcon.h b/include/linux/extcon.h
index 20587ee..2bc66ca 100644
--- a/include/linux/extcon.h
+++ b/include/linux/extcon.h
@@ -254,6 +254,9 @@ extern int extcon_unregister_notifier(struct extcon_dev *edev,
 /*
  * Following APIs control the memory of extcon device.
  */
+extern struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
+						   const char **cables);
+extern void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev);
 extern struct extcon_dev *extcon_dev_allocate(const char **cables);
 extern void extcon_dev_free(struct extcon_dev *edev);
 
@@ -368,5 +371,13 @@ static inline struct extcon_dev *extcon_dev_allocate(const char **cables)
 }
 
 static inline void extcon_dev_free(struct extcon_dev *edev) { }
+
+static inline struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
+							  const char **cables)
+{
+	return ERR_PTR(-ENOMEM);
+}
+
+static inline void devm_extcon_dev_free(struct extcon_dev *edev) { }
 #endif /* CONFIG_EXTCON */
 #endif /* __LINUX_EXTCON_H__ */
-- 
1.8.0

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