R0dn3yS/android_kernel_xiaomi_sm7250
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

extcon: Add usage of blocking notifier chain

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

Change-Id: I0e8e3b29d169ca833f85e42d2df98dd8380cbf46
Signed-off-by: Mayank Rana <mrana@codeaurora.org>
Signed-off-by: Jack Pham <jackp@codeaurora.org>
This commit is contained in:
Mayank Rana 2017-07-06 16:42:06 -07:00 committed by Hemant Kumar
parent d32d784e4a
commit 9dce266c7a
3 changed files with 75 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
drivers/extcon/extcon.c
View File

@ -486,6 +486,21 @@ 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 an external connector.
* @edev: the extcon device
@ -924,6 +939,38 @@ 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 notifier block from the extcon.
* @edev: the extcon device
@ -1258,6 +1305,13 @@ 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]);

1
drivers/extcon/extcon.h
View File

@ -48,6 +48,7 @@ struct extcon_dev {
struct device dev;
struct raw_notifier_head nh_all;
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 */

20
include/linux/extcon.h
View File

@ -208,6 +208,10 @@ 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);
@ -237,6 +241,8 @@ extern struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
/* Following API get the name 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_get_state(struct extcon_dev *edev, unsigned int id)
{
@ -268,6 +274,20 @@ 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)