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authorChanwoo Choi <cw00.choi@samsung.com>2015-05-19 20:01:12 +0900
committerChanwoo Choi <cw00.choi@samsung.com>2015-05-22 18:58:55 +0900
commit046050f6e623e442e9c71c525462ebd395dae526 (patch)
treea10b539ecc726366e80a466a8214ffd27ab44017 /drivers/extcon
parent8e9bc36df56d6fa1db78032533c0e167f8a0bdcf (diff)
extcon: Update the prototype of extcon_register_notifier() with enum extcon
Previously, extcon consumer driver used the extcon_register_interest() to register the notifier chain and then to receive the notifier event when external connector's state is changed. When registering the notifier chain for specific external connector with extcon_register_interest(), it used the the string name of external connector directly. There are potential problem because of unclear, non-standard and inconsequent cable name. Namely, it is not appropriate method to identify each external connector. So, this patch modify the prototype of extcon_register_notifier() by using the 'enum extcon' which are the unique id for each external connector instead of unclear string method. - Previously, the extcon consumer driver used the extcon_register_interest() with 'cable_name' to point out the specific external connector. Also. it used the un-needed structure (struct extcon_specific_cable_nb). : int extcon_register_interest(struct extcon_specific_cable_nb *obj, const char *extcon_name, const char *cable_name, struct notifier_block *nb) - Newly, the updated extcon_register_notifier() would definitely support the same feature to detech the changed state of external connector without any specific structure (struct extcon_specific_cable_nb). : int extcon_register_notifier(struct extcon_dev *edev, enum extcon id, struct notifier_block *nb) This patch support the both extcon_register_interest() and new extcon_register_ notifier(). But the extcon_{register|unregister}_interest() will be deprecated because extcon core would support the notifier event for extcon consumer driver with only updated extcon_register_notifier() and 'extcon_specific_cable_nb' will be removed if there are no extcon consumer driver with legacy extcon_{register|unregister}_interest(). Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Diffstat (limited to 'drivers/extcon')
-rw-r--r--drivers/extcon/extcon.c91
1 files changed, 48 insertions, 43 deletions
diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
index fce2687bde8e..5099c11d8833 100644
--- a/drivers/extcon/extcon.c
+++ b/drivers/extcon/extcon.c
@@ -146,6 +146,16 @@ static int find_cable_index_by_name(struct extcon_dev *edev, const char *name)
return find_cable_index_by_id(edev, id);
}
+static bool is_extcon_changed(u32 prev, u32 new, int idx, bool *attached)
+{
+ if (((prev >> idx) & 0x1) != ((new >> idx) & 0x1)) {
+ *attached = new ? true : false;
+ return true;
+ }
+
+ return false;
+}
+
static ssize_t state_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
@@ -254,23 +264,27 @@ int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state)
char *envp[3];
int env_offset = 0;
int length;
+ int index;
unsigned long flags;
+ bool attached;
spin_lock_irqsave(&edev->lock, flags);
if (edev->state != ((edev->state & ~mask) | (state & mask))) {
- u32 old_state = edev->state;
-
if (check_mutually_exclusive(edev, (edev->state & ~mask) |
(state & mask))) {
spin_unlock_irqrestore(&edev->lock, flags);
return -EPERM;
}
+ for (index = 0; index < edev->max_supported; index++) {
+ if (is_extcon_changed(edev->state, state, index, &attached))
+ raw_notifier_call_chain(&edev->nh[index], attached, edev);
+ }
+
edev->state &= ~mask;
edev->state |= state & mask;
- raw_notifier_call_chain(&edev->nh, old_state, edev);
/* This could be in interrupt handler */
prop_buf = (char *)get_zeroed_page(GFP_ATOMIC);
if (prop_buf) {
@@ -423,29 +437,6 @@ out:
}
EXPORT_SYMBOL_GPL(extcon_get_extcon_dev);
-static int _call_per_cable(struct notifier_block *nb, unsigned long val,
- void *ptr)
-{
- struct extcon_specific_cable_nb *obj = container_of(nb,
- struct extcon_specific_cable_nb, internal_nb);
- struct extcon_dev *edev = ptr;
-
- if ((val & (1 << obj->cable_index)) !=
- (edev->state & (1 << obj->cable_index))) {
- bool cable_state = true;
-
- obj->previous_value = val;
-
- if (val & (1 << obj->cable_index))
- cable_state = false;
-
- return obj->user_nb->notifier_call(obj->user_nb,
- cable_state, ptr);
- }
-
- return NOTIFY_OK;
-}
-
/**
* extcon_register_interest() - Register a notifier for a state change of a
* specific cable, not an entier set of cables of a
@@ -491,11 +482,10 @@ int extcon_register_interest(struct extcon_specific_cable_nb *obj,
obj->user_nb = nb;
- obj->internal_nb.notifier_call = _call_per_cable;
-
spin_lock_irqsave(&obj->edev->lock, flags);
- ret = raw_notifier_chain_register(&obj->edev->nh,
- &obj->internal_nb);
+ ret = raw_notifier_chain_register(
+ &obj->edev->nh[obj->cable_index],
+ obj->user_nb);
spin_unlock_irqrestore(&obj->edev->lock, flags);
} else {
struct class_dev_iter iter;
@@ -538,7 +528,8 @@ int extcon_unregister_interest(struct extcon_specific_cable_nb *obj)
return -EINVAL;
spin_lock_irqsave(&obj->edev->lock, flags);
- ret = raw_notifier_chain_unregister(&obj->edev->nh, &obj->internal_nb);
+ ret = raw_notifier_chain_unregister(
+ &obj->edev->nh[obj->cable_index], obj->user_nb);
spin_unlock_irqrestore(&obj->edev->lock, flags);
return ret;
@@ -548,21 +539,24 @@ EXPORT_SYMBOL_GPL(extcon_unregister_interest);
/**
* extcon_register_notifier() - Register a notifiee to get notified by
* any attach status changes from the extcon.
- * @edev: the extcon device.
+ * @edev: the extcon device that has the external connecotr.
+ * @id: the unique id of each external connector in extcon enumeration.
* @nb: a notifier block to be registered.
*
* Note that the second parameter given to the callback of nb (val) is
* "old_state", not the current state. The current state can be retrieved
* by looking at the third pameter (edev pointer)'s state value.
*/
-int extcon_register_notifier(struct extcon_dev *edev,
- struct notifier_block *nb)
+int extcon_register_notifier(struct extcon_dev *edev, enum extcon id,
+ struct notifier_block *nb)
{
unsigned long flags;
- int ret;
+ int ret, idx;
+
+ idx = find_cable_index_by_id(edev, id);
spin_lock_irqsave(&edev->lock, flags);
- ret = raw_notifier_chain_register(&edev->nh, nb);
+ ret = raw_notifier_chain_register(&edev->nh[idx], nb);
spin_unlock_irqrestore(&edev->lock, flags);
return ret;
@@ -571,17 +565,20 @@ EXPORT_SYMBOL_GPL(extcon_register_notifier);
/**
* extcon_unregister_notifier() - Unregister a notifiee from the extcon device.
- * @edev: the extcon device.
- * @nb: a registered notifier block to be unregistered.
+ * @edev: the extcon device that has the external connecotr.
+ * @id: the unique id of each external connector in extcon enumeration.
+ * @nb: a notifier block to be registered.
*/
-int extcon_unregister_notifier(struct extcon_dev *edev,
- struct notifier_block *nb)
+int extcon_unregister_notifier(struct extcon_dev *edev, enum extcon id,
+ struct notifier_block *nb)
{
unsigned long flags;
- int ret;
+ int ret, idx;
+
+ idx = find_cable_index_by_id(edev, id);
spin_lock_irqsave(&edev->lock, flags);
- ret = raw_notifier_chain_unregister(&edev->nh, nb);
+ ret = raw_notifier_chain_unregister(&edev->nh[idx], nb);
spin_unlock_irqrestore(&edev->lock, flags);
return ret;
@@ -893,7 +890,15 @@ int extcon_dev_register(struct extcon_dev *edev)
spin_lock_init(&edev->lock);
- RAW_INIT_NOTIFIER_HEAD(&edev->nh);
+ edev->nh = devm_kzalloc(&edev->dev,
+ sizeof(*edev->nh) * edev->max_supported, GFP_KERNEL);
+ if (!edev->nh) {
+ ret = -ENOMEM;
+ goto err_dev;
+ }
+
+ for (index = 0; index < edev->max_supported; index++)
+ RAW_INIT_NOTIFIER_HEAD(&edev->nh[index]);
dev_set_drvdata(&edev->dev, edev);
edev->state = 0;