diff options
Diffstat (limited to 'drivers/extcon/extcon.c')
-rw-r--r-- | drivers/extcon/extcon.c | 201 |
1 files changed, 24 insertions, 177 deletions
diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c index 21a123c..4fef9ab 100644 --- a/drivers/extcon/extcon.c +++ b/drivers/extcon/extcon.c @@ -127,38 +127,6 @@ static int find_cable_index_by_id(struct extcon_dev *edev, const unsigned int id return -EINVAL; } -static int find_cable_id_by_name(struct extcon_dev *edev, const char *name) -{ - int id = -EINVAL; - int i = 0; - - /* Find the id of extcon cable */ - while (extcon_name[i]) { - if (!strncmp(extcon_name[i], name, CABLE_NAME_MAX)) { - id = i; - break; - } - i++; - } - - return id; -} - -static int find_cable_index_by_name(struct extcon_dev *edev, const char *name) -{ - int id; - - if (edev->max_supported == 0) - return -EINVAL; - - /* Find the the number of extcon cable */ - id = find_cable_id_by_name(edev, name); - if (id < 0) - return id; - - 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)) { @@ -374,25 +342,6 @@ int extcon_get_cable_state_(struct extcon_dev *edev, const unsigned int id) EXPORT_SYMBOL_GPL(extcon_get_cable_state_); /** - * extcon_get_cable_state() - Get the status of a specific cable. - * @edev: the extcon device that has the cable. - * @cable_name: cable name. - * - * Note that this is slower than extcon_get_cable_state_. - */ -int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name) -{ - int id; - - id = find_cable_id_by_name(edev, cable_name); - if (id < 0) - return id; - - return extcon_get_cable_state_(edev, id); -} -EXPORT_SYMBOL_GPL(extcon_get_cable_state); - -/** * extcon_set_cable_state_() - Set the status of a specific cable. * @edev: the extcon device that has the cable. * @id: the unique id of each external connector @@ -422,28 +371,6 @@ int extcon_set_cable_state_(struct extcon_dev *edev, unsigned int id, EXPORT_SYMBOL_GPL(extcon_set_cable_state_); /** - * extcon_set_cable_state() - Set the status of a specific cable. - * @edev: the extcon device that has the cable. - * @cable_name: cable name. - * @cable_state: the new cable status. The default semantics is - * true: attached / false: detached. - * - * Note that this is slower than extcon_set_cable_state_. - */ -int extcon_set_cable_state(struct extcon_dev *edev, - const char *cable_name, bool cable_state) -{ - int id; - - id = find_cable_id_by_name(edev, cable_name); - if (id < 0) - return id; - - return extcon_set_cable_state_(edev, id, cable_state); -} -EXPORT_SYMBOL_GPL(extcon_set_cable_state); - -/** * extcon_get_extcon_dev() - Get the extcon device instance from the name * @extcon_name: The extcon name provided with extcon_dev_register() */ @@ -467,105 +394,6 @@ out: EXPORT_SYMBOL_GPL(extcon_get_extcon_dev); /** - * extcon_register_interest() - Register a notifier for a state change of a - * specific cable, not an entier set of cables of a - * extcon device. - * @obj: an empty extcon_specific_cable_nb object to be returned. - * @extcon_name: the name of extcon device. - * if NULL, extcon_register_interest will register - * every cable with the target cable_name given. - * @cable_name: the target cable name. - * @nb: the notifier block to get notified. - * - * Provide an empty extcon_specific_cable_nb. extcon_register_interest() sets - * the struct for you. - * - * extcon_register_interest is a helper function for those who want to get - * notification for a single specific cable's status change. If a user wants - * to get notification for any changes of all cables of a extcon device, - * he/she should use the general extcon_register_notifier(). - * - * 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_interest(struct extcon_specific_cable_nb *obj, - const char *extcon_name, const char *cable_name, - struct notifier_block *nb) -{ - unsigned long flags; - int ret; - - if (!obj || !cable_name || !nb) - return -EINVAL; - - if (extcon_name) { - obj->edev = extcon_get_extcon_dev(extcon_name); - if (!obj->edev) - return -ENODEV; - - obj->cable_index = find_cable_index_by_name(obj->edev, - cable_name); - if (obj->cable_index < 0) - return obj->cable_index; - - obj->user_nb = nb; - - spin_lock_irqsave(&obj->edev->lock, flags); - 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; - 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 = dev_get_drvdata(dev); - - if (find_cable_index_by_name(extd, cable_name) < 0) - continue; - - class_dev_iter_exit(&iter); - return extcon_register_interest(obj, extd->name, - cable_name, nb); - } - - ret = -ENODEV; - } - - return ret; -} -EXPORT_SYMBOL_GPL(extcon_register_interest); - -/** - * extcon_unregister_interest() - Unregister the notifier registered by - * extcon_register_interest(). - * @obj: the extcon_specific_cable_nb object returned by - * extcon_register_interest(). - */ -int extcon_unregister_interest(struct extcon_specific_cable_nb *obj) -{ - unsigned long flags; - int ret; - - if (!obj) - return -EINVAL; - - spin_lock_irqsave(&obj->edev->lock, flags); - ret = raw_notifier_chain_unregister( - &obj->edev->nh[obj->cable_index], obj->user_nb); - spin_unlock_irqrestore(&obj->edev->lock, flags); - - return ret; -} -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 that has the external connecotr. @@ -582,14 +410,33 @@ int extcon_register_notifier(struct extcon_dev *edev, unsigned int id, unsigned long flags; int ret, idx; - if (!edev || !nb) + if (!nb) return -EINVAL; - idx = find_cable_index_by_id(edev, id); + if (edev) { + idx = find_cable_index_by_id(edev, id); - spin_lock_irqsave(&edev->lock, flags); - ret = raw_notifier_chain_register(&edev->nh[idx], nb); - spin_unlock_irqrestore(&edev->lock, flags); + spin_lock_irqsave(&edev->lock, flags); + ret = raw_notifier_chain_register(&edev->nh[idx], nb); + spin_unlock_irqrestore(&edev->lock, flags); + } else { + struct extcon_dev *extd; + + mutex_lock(&extcon_dev_list_lock); + list_for_each_entry(extd, &extcon_dev_list, entry) { + idx = find_cable_index_by_id(extd, id); + if (idx >= 0) + break; + } + mutex_unlock(&extcon_dev_list_lock); + + if (idx >= 0) { + edev = extd; + return extcon_register_notifier(extd, id, nb); + } else { + ret = -ENODEV; + } + } return ret; } |