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extcon: add possibility to get extcon device by OF node

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Since extcon property is not allowed in DT, extcon subsystem requires
another way to get extcon device. Lets try the simplest approach - get
edev by of_node.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
This commit is contained in:
Andrzej Hajda 2018-02-27 13:22:07 +01:00 committed by Chanwoo Choi
parent 1421717321
commit 370ed7a9b9
2 changed files with 40 additions and 10 deletions
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44
drivers/extcon/extcon.c
View File

@ -1336,6 +1336,28 @@ void extcon_dev_unregister(struct extcon_dev *edev)
EXPORT_SYMBOL_GPL(extcon_dev_unregister);
#ifdef CONFIG_OF
/*
* extcon_find_edev_by_node - Find the extcon device from devicetree.
* @node : OF node identifying edev
*
* Return the pointer of extcon device if success or ERR_PTR(err) if fail.
*/
struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
{
struct extcon_dev *edev;
mutex_lock(&extcon_dev_list_lock);
list_for_each_entry(edev, &extcon_dev_list, entry)
if (edev->dev.parent && edev->dev.parent->of_node == node)
goto out;
edev = ERR_PTR(-EPROBE_DEFER);
out:
mutex_unlock(&extcon_dev_list_lock);
return edev;
}
/*
* extcon_get_edev_by_phandle - Get the extcon device from devicetree.
* @dev : the instance to the given device
@ -1363,25 +1385,27 @@ struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
return ERR_PTR(-ENODEV);
}
mutex_lock(&extcon_dev_list_lock);
list_for_each_entry(edev, &extcon_dev_list, entry) {
if (edev->dev.parent && edev->dev.parent->of_node == node) {
mutex_unlock(&extcon_dev_list_lock);
of_node_put(node);
return edev;
}
}
mutex_unlock(&extcon_dev_list_lock);
edev = extcon_find_edev_by_node(node);
of_node_put(node);
return ERR_PTR(-EPROBE_DEFER);
return edev;
}
#else
struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
{
return ERR_PTR(-ENOSYS);
}
struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, int index)
{
return ERR_PTR(-ENOSYS);
}
#endif /* CONFIG_OF */
EXPORT_SYMBOL_GPL(extcon_find_edev_by_node);
EXPORT_SYMBOL_GPL(extcon_get_edev_by_phandle);
/**

6
include/linux/extcon.h
View File

@ -230,6 +230,7 @@ extern void devm_extcon_unregister_notifier_all(struct device *dev,
* Following APIs get the extcon_dev from devicetree or by through extcon name.
*/
extern struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name);
extern struct extcon_dev *extcon_find_edev_by_node(struct device_node *node);
extern struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
int index);
@ -283,6 +284,11 @@ static inline struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
return ERR_PTR(-ENODEV);
}
static inline struct extcon_dev *extcon_find_edev_by_node(struct device_node *node)
{
return ERR_PTR(-ENODEV);
}
static inline struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
int index)
{