/* * External connector (extcon) class driver * * Copyright (C) 2012 Samsung Electronics * Author: Donggeun Kim * Author: MyungJoo Ham * * based on switch class driver * Copyright (C) 2008 Google, Inc. * Author: Mike Lockwood * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and * may be copied, distributed, and modified under those terms. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #ifndef __LINUX_EXTCON_H__ #define __LINUX_EXTCON_H__ #include #define SUPPORTED_CABLE_MAX 32 #define CABLE_NAME_MAX 30 /* * The standard cable name is to help support general notifier * and notifee device drivers to share the common names. * Please use standard cable names unless your notifier device has * a very unique and abnormal cable or * the cable type is supposed to be used with only one unique * pair of notifier/notifee devices. * * Please add any other "standard" cables used with extcon dev. * * You may add a dot and number to specify version or specification * of the specific cable if it is required. (e.g., "Fast-charger.18" * and "Fast-charger.10" for 1.8A and 1.0A chargers) * However, the notifee and notifier should be able to handle such * string and if the notifee can negotiate the protocol or idenify, * you don't need such convention. This convention is helpful when * notifier can distinguish but notifiee cannot. */ enum extcon_cable_name { EXTCON_USB = 0, EXTCON_USB_HOST, EXTCON_TA, /* Travel Adaptor */ EXTCON_FAST_CHARGER, EXTCON_SLOW_CHARGER, EXTCON_CHARGE_DOWNSTREAM, /* Charging an external device */ EXTCON_HDMI, EXTCON_MHL, EXTCON_DVI, EXTCON_VGA, EXTCON_DOCK, EXTCON_LINE_IN, EXTCON_LINE_OUT, EXTCON_MIC_IN, EXTCON_HEADPHONE_OUT, EXTCON_SPDIF_IN, EXTCON_SPDIF_OUT, EXTCON_VIDEO_IN, EXTCON_VIDEO_OUT, }; extern const char *extcon_cable_name[]; struct extcon_cable; /** * struct extcon_dev - An extcon device represents one external connector. * @name The name of this extcon device. Parent device name is used * if NULL. * @supported_cable Array of supported cable name ending with NULL. * If supported_cable is NULL, cable name related APIs * are disabled. * @print_name An optional callback to override the method to print the * name of the extcon device. * @print_state An optional callback to override the method to print the * status of the extcon device. * @dev Device of this extcon. Do not provide at register-time. * @state Attach/detach state of this extcon. Do not provide at * register-time * @nh Notifier for the state change events from this extcon * @entry To support list of extcon devices so that uses can search * for extcon devices based on the extcon name. * @lock * @max_supported Internal value to store the number of cables. * @extcon_dev_type Device_type struct to provide attribute_groups * customized for each extcon device. * @cables Sysfs subdirectories. Each represents one cable. * * In most cases, users only need to provide "User initializing data" of * this struct when registering an extcon. In some exceptional cases, * optional callbacks may be needed. However, the values in "internal data" * are overwritten by register function. */ struct extcon_dev { /* --- Optional user initializing data --- */ const char *name; const char **supported_cable; /* --- Optional callbacks to override class functions --- */ ssize_t (*print_name)(struct extcon_dev *edev, char *buf); ssize_t (*print_state)(struct extcon_dev *edev, char *buf); /* --- Internal data. Please do not set. --- */ struct device *dev; u32 state; struct raw_notifier_head nh; struct list_head entry; spinlock_t lock; /* could be called by irq handler */ int max_supported; /* /sys/class/extcon/.../cable.n/... */ struct device_type extcon_dev_type; struct extcon_cable *cables; }; /** * struct extcon_cable - An internal data for each cable of extcon device. * @edev The extcon device * @cable_index Index of this cable in the edev * @attr_g Attribute group for the cable * @attr_name "name" sysfs entry * @attr_state "state" sysfs entry * @attrs Array pointing to attr_name and attr_state for attr_g */ struct extcon_cable { struct extcon_dev *edev; int cable_index; struct attribute_group attr_g; struct device_attribute attr_name; struct device_attribute attr_state; struct attribute *attrs[3]; /* to be fed to attr_g.attrs */ }; /** * struct extcon_specific_cable_nb - An internal data for * extcon_register_interest(). * @internal_nb a notifier block bridging extcon notifier and cable notifier. * @user_nb user provided notifier block for events from a specific cable. * @cable_index the target cable. * @edev the target extcon device. * @previous_value the saved previous event value. */ struct extcon_specific_cable_nb { struct notifier_block internal_nb; struct notifier_block *user_nb; int cable_index; struct extcon_dev *edev; unsigned long previous_value; }; #if IS_ENABLED(CONFIG_EXTCON) /* * Following APIs are for notifiers or configurations. * Notifiers are the external port and connection devices. */ extern int extcon_dev_register(struct extcon_dev *edev, struct device *dev); extern void extcon_dev_unregister(struct extcon_dev *edev); extern struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name); /* * get/set/update_state access the 32b encoded state value, which represents * states of all possible cables of the multistate port. For example, if one * calls extcon_set_state(edev, 0x7), it may mean that all the three cables * are attached to the port. */ static inline u32 extcon_get_state(struct extcon_dev *edev) { return edev->state; } extern void extcon_set_state(struct extcon_dev *edev, u32 state); extern void extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state); /* * get/set_cable_state access each bit of the 32b encoded state value. * They are used to access the status of each cable based on the cable_name * or cable_index, which is retrived by extcon_find_cable_index */ extern int extcon_find_cable_index(struct extcon_dev *sdev, const char *cable_name); extern int extcon_get_cable_state_(struct extcon_dev *edev, int cable_index); extern int extcon_set_cable_state_(struct extcon_dev *edev, int cable_index, bool cable_state); extern int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name); extern int extcon_set_cable_state(struct extcon_dev *edev, const char *cable_name, bool cable_state); /* * Following APIs are for notifiees (those who want to be notified) * to register a callback for events from a specific cable of the extcon. * Notifiees are the connected device drivers wanting to get notified by * a specific external port of a connection device. */ extern int extcon_register_interest(struct extcon_specific_cable_nb *obj, const char *extcon_name, const char *cable_name, struct notifier_block *nb); extern int extcon_unregister_interest(struct extcon_specific_cable_nb *nb); /* * Following APIs are to monitor every action of a notifier. * Registerer gets notified for every external port of a connection device. * Probably this could be used to debug an action of notifier; however, * we do not recommend to use this at normal 'notifiee' device drivers who * want to be notified by a specific external port of the notifier. */ extern int extcon_register_notifier(struct extcon_dev *edev, struct notifier_block *nb); extern int extcon_unregister_notifier(struct extcon_dev *edev, struct notifier_block *nb); #else /* CONFIG_EXTCON */ static inline int extcon_dev_register(struct extcon_dev *edev, struct device *dev) { return 0; } static inline void extcon_dev_unregister(struct extcon_dev *edev) { } static inline u32 extcon_get_state(struct extcon_dev *edev) { return 0; } static inline void extcon_set_state(struct extcon_dev *edev, u32 state) { } static inline void extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state) { } static inline int extcon_find_cable_index(struct extcon_dev *edev, const char *cable_name) { return 0; } static inline int extcon_get_cable_state_(struct extcon_dev *edev, int cable_index) { return 0; } static inline int extcon_set_cable_state_(struct extcon_dev *edev, int cable_index, bool cable_state) { return 0; } static inline int extcon_get_cable_state(struct extcon_dev *edev, const char *cable_name) { return 0; } static inline int extcon_set_cable_state(struct extcon_dev *edev, const char *cable_name, int state) { return 0; } static inline struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name) { return NULL; } static inline int extcon_register_notifier(struct extcon_dev *edev, struct notifier_block *nb) { return 0; } static inline int extcon_unregister_notifier(struct extcon_dev *edev, struct notifier_block *nb) { return 0; } static inline int extcon_register_interest(struct extcon_specific_cable_nb *obj, const char *extcon_name, const char *cable_name, struct notifier_block *nb) { return 0; } static inline int extcon_unregister_interest(struct extcon_specific_cable_nb *obj) { return 0; } #endif /* CONFIG_EXTCON */ #endif /* __LINUX_EXTCON_H__ */