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Diffstat (limited to 'include/linux/extcon.h')
| -rw-r--r-- | include/linux/extcon.h | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/include/linux/extcon.h b/include/linux/extcon.h new file mode 100644 index 00000000000..9cb3aaaf67f --- /dev/null +++ b/include/linux/extcon.h @@ -0,0 +1,82 @@ +/* + * External connector (extcon) class driver + * + * Copyright (C) 2012 Samsung Electronics + * Author: Donggeun Kim <dg77.kim@samsung.com> + * Author: MyungJoo Ham <myungjoo.ham@samsung.com> + * + * based on switch class driver + * Copyright (C) 2008 Google, Inc. + * Author: Mike Lockwood <lockwood@android.com> + * + * 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__ + +/** + * struct extcon_dev - An extcon device represents one external connector. + * @name The name of this extcon device. Parent device name is used + * if NULL. + * @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 + * + * 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; + + /* --- 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; +}; + +#if IS_ENABLED(CONFIG_EXTCON) +extern int extcon_dev_register(struct extcon_dev *edev, struct device *dev); +extern void extcon_dev_unregister(struct extcon_dev *edev); + +static inline u32 extcon_get_state(struct extcon_dev *edev) +{ + return edev->state; +} + +extern void extcon_set_state(struct extcon_dev *edev, u32 state); +#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) { } +#endif /* CONFIG_EXTCON */ +#endif /* __LINUX_EXTCON_H__ */ |