There are some scnearios where a driver/framework needs to register interest for a particular cable without specifying the extcon device name. One such scenario is charger notifications. The platform will have charger cabel which will be bound to any extcon device. It's not mandatory for the charger driver to know which extcon device it should use. This patch enables the support for registering interest for a cable just by cable name wihtout specifying the extcon device name
Signed-off-by: Jenny TC <jenny...@intel.com> --- v1: Initial submit V2: Removed the new API and modified the extcon_register_interest API to accomodate the new requirement drivers/extcon/extcon-class.c | 43 +++++++++++++++++++++++++++++++---------- 1 file changed, 33 insertions(+), 10 deletions(-) diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c index 946a318..738919e 100644 --- a/drivers/extcon/extcon-class.c +++ b/drivers/extcon/extcon-class.c @@ -466,22 +466,45 @@ int extcon_register_interest(struct extcon_specific_cable_nb *obj, const char *extcon_name, const char *cable_name, struct notifier_block *nb) { - if (!obj || !extcon_name || !cable_name || !nb) + + if (!obj || !cable_name || !nb) return -EINVAL; - obj->edev = extcon_get_extcon_dev(extcon_name); - if (!obj->edev) - return -ENODEV; + if (extcon_name) { + + obj->edev = extcon_get_extcon_dev(extcon_name); + if (!obj->edev) + return -ENODEV; + + obj->cable_index = extcon_find_cable_index(obj->edev, cable_name); + if (obj->cable_index < 0) + return -ENODEV; - obj->cable_index = extcon_find_cable_index(obj->edev, cable_name); - if (obj->cable_index < 0) - return -ENODEV; + obj->user_nb = nb; - obj->user_nb = nb; + obj->internal_nb.notifier_call = _call_per_cable; - obj->internal_nb.notifier_call = _call_per_cable; + return raw_notifier_chain_register(&obj->edev->nh, &obj->internal_nb); + } else { + struct class_dev_iter iter; + struct extcon_dev *extd; + struct device *dev; + if (!extcon_class) + return -ENODEV; + class_dev_iter_init(&iter, extcon_class, NULL, NULL); + while ((dev = class_dev_iter_next(&iter))) { + extd = (struct extcon_dev *)dev_get_drvdata(dev); + + if (extcon_find_cable_index(extd, cable_name) < 0) + continue; + + class_dev_iter_exit(&iter); + return extcon_register_interest(obj, extd->name, + cable_name, nb); + } - return raw_notifier_chain_register(&obj->edev->nh, &obj->internal_nb); + return -ENODEV; + } } /** -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/