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Commit 1e466abb authored by Mayank Rana's avatar Mayank Rana
Browse files

extcon: Add usage of blocking notifier chain 



This change adds required APIs to register blocking notifier call
for blocking functionality using extcon framework.

Change-Id: I0e8e3b29d169ca833f85e42d2df98dd8380cbf46
Signed-off-by: default avatarMayank Rana <mrana@codeaurora.org>
parent 4d9a308b

drivers/extcon/extcon.c

+54 −0
Original line number Diff line number Diff line
@@ -482,6 +482,21 @@ int extcon_sync(struct extcon_dev *edev, unsigned int id) 
}

EXPORT_SYMBOL_GPL(extcon_sync);



int extcon_blocking_sync(struct extcon_dev *edev, unsigned int id, bool val)

{

	int index;



	if (!edev)

		return -EINVAL;



	index = find_cable_index_by_id(edev, id);

	if (index < 0)

		return index;



	return blocking_notifier_call_chain(&edev->bnh[index], val, edev);

}

EXPORT_SYMBOL(extcon_blocking_sync);



/**

 * extcon_get_state() - Get the state of a external connector.

 * @edev:	the extcon device that has the cable.
@@ -940,6 +955,38 @@ int extcon_register_notifier(struct extcon_dev *edev, unsigned int id, 
}

EXPORT_SYMBOL_GPL(extcon_register_notifier);



int extcon_register_blocking_notifier(struct extcon_dev *edev, unsigned int id,

			struct notifier_block *nb)

{

	int idx = -EINVAL;



	if (!edev || !nb)

		return -EINVAL;



	idx = find_cable_index_by_id(edev, id);

	if (idx < 0)

		return idx;



	return blocking_notifier_chain_register(&edev->bnh[idx], nb);

}

EXPORT_SYMBOL(extcon_register_blocking_notifier);



int extcon_unregister_blocking_notifier(struct extcon_dev *edev,

			unsigned int id, struct notifier_block *nb)

{

	int idx;



	if (!edev || !nb)

		return -EINVAL;



	idx = find_cable_index_by_id(edev, id);

	if (idx < 0)

		return idx;



	return blocking_notifier_chain_unregister(&edev->bnh[idx], nb);

}

EXPORT_SYMBOL(extcon_unregister_blocking_notifier);



/**

 * extcon_unregister_notifier() - Unregister a notifiee from the extcon device.

 * @edev:	the extcon device that has the external connecotr.
@@ -1222,6 +1269,13 @@ int extcon_dev_register(struct extcon_dev *edev) 
		goto err_dev;

	}



	edev->bnh = devm_kzalloc(&edev->dev,

			sizeof(*edev->bnh) * edev->max_supported, GFP_KERNEL);

	if (!edev->bnh) {

		ret = -ENOMEM;

		goto err_dev;

	}



	for (index = 0; index < edev->max_supported; index++)

		RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]);

include/linux/extcon.h

+21 −1
Original line number Diff line number Diff line
@@ -202,6 +202,7 @@ struct extcon_dev { 
	/* Internal data. Please do not set. */

	struct device dev;

	struct raw_notifier_head *nh;

	struct blocking_notifier_head *bnh;

	struct list_head entry;

	int max_supported;

	spinlock_t lock;	/* could be called by irq handler */
@@ -289,6 +290,10 @@ extern int extcon_register_notifier(struct extcon_dev *edev, unsigned int id, 
				    struct notifier_block *nb);

extern int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,

				    struct notifier_block *nb);

extern int extcon_register_blocking_notifier(struct extcon_dev *edev,

		unsigned int id, struct notifier_block *nb);

extern int extcon_unregister_blocking_notifier(struct extcon_dev *edev,

		unsigned int id, struct notifier_block *nb);

extern int devm_extcon_register_notifier(struct device *dev,

				struct extcon_dev *edev, unsigned int id,

				struct notifier_block *nb);
@@ -306,7 +311,8 @@ extern struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev, 
/* Following API to get information of extcon device */

extern const char *extcon_get_edev_name(struct extcon_dev *edev);





extern int extcon_blocking_sync(struct extcon_dev *edev, unsigned int id,

							bool val);

#else /* CONFIG_EXTCON */

static inline int extcon_dev_register(struct extcon_dev *edev)

{
@@ -413,6 +419,20 @@ static inline int extcon_unregister_notifier(struct extcon_dev *edev, 
	return 0;

}



static inline int extcon_register_blocking_notifier(struct extcon_dev *edev,

					unsigned int id,

					struct notifier_block *nb)

{

	return 0;

}



static inline int extcon_unregister_blocking_notifier(struct extcon_dev *edev,

					unsigned int id,

					struct notifier_block *nb)

{

	return 0;

}



static inline int devm_extcon_register_notifier(struct device *dev,

				struct extcon_dev *edev, unsigned int id,

				struct notifier_block *nb)