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author | Chanwoo Choi <cw00.choi@samsung.com> | 2016-06-27 20:03:39 +0900 |
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committer | Chanwoo Choi <cw00.choi@samsung.com> | 2016-06-27 21:03:23 +0900 |
commit | 58f386560a68dd98bd6744a28fc853eef11faebe (patch) | |
tree | 79265ea59e032c3bd44523374e3a59c263d5fce1 /drivers/extcon | |
parent | b225d00f3ad2d996f914790a0f6324a4efd18768 (diff) | |
download | talos-op-linux-58f386560a68dd98bd6744a28fc853eef11faebe.tar.gz talos-op-linux-58f386560a68dd98bd6744a28fc853eef11faebe.zip |
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.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/extcon/devres.c b/drivers/extcon/devres.c index 694ca85d5a70..e686acd1c459 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); |