summaryrefslogtreecommitdiff
path: root/drivers/extcon
diff options
context:
space:
mode:
authorChanwoo Choi <cw00.choi@samsung.com>2016-06-27 11:03:39 (GMT)
committerChanwoo Choi <cw00.choi@samsung.com>2016-06-27 12:03:23 (GMT)
commit58f386560a68dd98bd6744a28fc853eef11faebe (patch)
tree79265ea59e032c3bd44523374e3a59c263d5fce1 /drivers/extcon
parentb225d00f3ad2d996f914790a0f6324a4efd18768 (diff)
downloadlinux-58f386560a68dd98bd6744a28fc853eef11faebe.tar.xz
extcon: Add resource-managed functions to register extcon notifier
This patch adds the resource-managed functions for register/unregister the extcon notifier with the id of each external connector. This function will make it easy to handle the extcon notifier. - int devm_extcon_register_notifier(struct device *dev, struct extcon_dev *edev, unsigned int id, struct notifier_block *nb); - void devm_extcon_unregister_notifier(struct device *dev, struct extcon_dev *edev, unsigned int id, struct notifier_block *nb); Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Diffstat (limited to 'drivers/extcon')
-rw-r--r--drivers/extcon/devres.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/extcon/devres.c b/drivers/extcon/devres.c
index 694ca85..e686acd 100644
--- a/drivers/extcon/devres.c
+++ b/drivers/extcon/devres.c
@@ -37,6 +37,19 @@ static void devm_extcon_dev_unreg(struct device *dev, void *res)
extcon_dev_unregister(*(struct extcon_dev **)res);
}
+struct extcon_dev_notifier_devres {
+ struct extcon_dev *edev;
+ unsigned int id;
+ struct notifier_block *nb;
+};
+
+static void devm_extcon_dev_notifier_unreg(struct device *dev, void *res)
+{
+ struct extcon_dev_notifier_devres *this = res;
+
+ extcon_unregister_notifier(this->edev, this->id, this->nb);
+}
+
/**
* devm_extcon_dev_allocate - Allocate managed extcon device
* @dev: device owning the extcon device being created
@@ -141,3 +154,63 @@ void devm_extcon_dev_unregister(struct device *dev, struct extcon_dev *edev)
devm_extcon_dev_match, edev));
}
EXPORT_SYMBOL_GPL(devm_extcon_dev_unregister);
+
+/**
+ * devm_extcon_register_notifier() - Resource-managed extcon_register_notifier()
+ * @dev: device to allocate 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.
+ *
+ * This function manages automatically the notifier of extcon device using
+ * device resource management and simplify the control of unregistering
+ * the notifier of extcon device.
+ *
+ * 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.
+ *
+ * Returns 0 if success or negaive error number if failure.
+ */
+int devm_extcon_register_notifier(struct device *dev, struct extcon_dev *edev,
+ unsigned int id, struct notifier_block *nb)
+{
+ struct extcon_dev_notifier_devres *ptr;
+ int ret;
+
+ ptr = devres_alloc(devm_extcon_dev_notifier_unreg, sizeof(*ptr),
+ GFP_KERNEL);
+ if (!ptr)
+ return -ENOMEM;
+
+ ret = extcon_register_notifier(edev, id, nb);
+ if (ret) {
+ devres_free(ptr);
+ return ret;
+ }
+
+ ptr->edev = edev;
+ ptr->id = id;
+ ptr->nb = nb;
+ devres_add(dev, ptr);
+
+ return 0;
+}
+EXPORT_SYMBOL(devm_extcon_register_notifier);
+
+/**
+ * devm_extcon_unregister_notifier()
+ - Resource-managed extcon_unregister_notifier()
+ * @dev: device to allocate 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.
+ */
+void devm_extcon_unregister_notifier(struct device *dev,
+ struct extcon_dev *edev, unsigned int id,
+ struct notifier_block *nb)
+{
+ WARN_ON(devres_release(dev, devm_extcon_dev_notifier_unreg,
+ devm_extcon_dev_match, edev));
+}
+EXPORT_SYMBOL(devm_extcon_unregister_notifier);