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The extcon has two type of extcon devices as following.
- 'extcon provider deivce' adds new extcon device and detect the
state/properties of external connector. Also, it notifies the
state/properties to the extcon consumer device.
- 'extcon consumer device' gets the change state/properties
from extcon provider device.
Prior to that, include/linux/extcon.h contains all exported API for
both provider and consumer device driver. To clarify the meaning of
header file and to remove the wrong use-case on consumer device,
this patch separates into extcon.h and extcon-provider.h.
[Description for include/linux/{extcon.h|extcon-provider.h}]
- extcon.h includes the extcon API and data structure for extcon consumer
device driver. This header file contains the following APIs:
: Register/unregister the notifier to catch the change of extcon device
: Get the extcon device instance
: Get the extcon device name
: Get the state of each external connector
: Get the property value of each external connector
: Get the property capability of each external connector
- extcon-provider.h includes the extcon API and data structure for extcon
provider device driver. This header file contains the following APIs:
: Include 'include/linux/extcon.h'
: Allocate the memory for extcon device instance
: Register/unregister extcon device
: Set the state of each external connector
: Set the property value of each external connector
: Set the property capability of each external connector
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Acked-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
143 lines
4.3 KiB
C
143 lines
4.3 KiB
C
/*
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* External Connector (extcon) framework
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* - linux/include/linux/extcon-provider.h for extcon provider device driver.
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*
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* Copyright (C) 2017 Samsung Electronics
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* Author: Chanwoo Choi <cw00.choi@samsung.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef __LINUX_EXTCON_PROVIDER_H__
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#define __LINUX_EXTCON_PROVIDER_H__
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#include <linux/extcon.h>
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struct extcon_dev;
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#if IS_ENABLED(CONFIG_EXTCON)
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/* Following APIs register/unregister the extcon device. */
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extern int extcon_dev_register(struct extcon_dev *edev);
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extern void extcon_dev_unregister(struct extcon_dev *edev);
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extern int devm_extcon_dev_register(struct device *dev,
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struct extcon_dev *edev);
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extern void devm_extcon_dev_unregister(struct device *dev,
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struct extcon_dev *edev);
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/* Following APIs allocate/free the memory of the extcon device. */
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extern struct extcon_dev *extcon_dev_allocate(const unsigned int *cable);
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extern void extcon_dev_free(struct extcon_dev *edev);
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extern struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
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const unsigned int *cable);
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extern void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev);
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/* Synchronize the state and property value for each external connector. */
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extern int extcon_sync(struct extcon_dev *edev, unsigned int id);
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/*
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* Following APIs set the connected state of each external connector.
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* The 'id' argument indicates the defined external connector.
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*/
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extern int extcon_set_state(struct extcon_dev *edev, unsigned int id,
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bool state);
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extern int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id,
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bool state);
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/*
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* Following APIs set the property of each external connector.
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* The 'id' argument indicates the defined external connector
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* and the 'prop' indicates the extcon property.
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*
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* And extcon_set_property_capability() set the capability of the property
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* for each external connector. They are used to set the capability of the
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* property of each external connector based on the id and property.
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*/
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extern int extcon_set_property(struct extcon_dev *edev, unsigned int id,
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unsigned int prop,
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union extcon_property_value prop_val);
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extern int extcon_set_property_sync(struct extcon_dev *edev, unsigned int id,
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unsigned int prop,
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union extcon_property_value prop_val);
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extern int extcon_set_property_capability(struct extcon_dev *edev,
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unsigned int id, unsigned int prop);
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#else /* CONFIG_EXTCON */
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static inline int extcon_dev_register(struct extcon_dev *edev)
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{
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return 0;
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}
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static inline void extcon_dev_unregister(struct extcon_dev *edev) { }
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static inline int devm_extcon_dev_register(struct device *dev,
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struct extcon_dev *edev)
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{
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return -EINVAL;
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}
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static inline void devm_extcon_dev_unregister(struct device *dev,
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struct extcon_dev *edev) { }
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static inline struct extcon_dev *extcon_dev_allocate(const unsigned int *cable)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline void extcon_dev_free(struct extcon_dev *edev) { }
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static inline struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
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const unsigned int *cable)
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{
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return ERR_PTR(-ENOSYS);
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}
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static inline void devm_extcon_dev_free(struct extcon_dev *edev) { }
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static inline int extcon_set_state(struct extcon_dev *edev, unsigned int id,
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bool state)
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{
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return 0;
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}
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static inline int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id,
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bool state)
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{
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return 0;
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}
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static inline int extcon_sync(struct extcon_dev *edev, unsigned int id)
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{
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return 0;
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}
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static inline int extcon_set_property(struct extcon_dev *edev, unsigned int id,
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unsigned int prop,
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union extcon_property_value prop_val)
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{
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return 0;
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}
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static inline int extcon_set_property_sync(struct extcon_dev *edev,
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unsigned int id, unsigned int prop,
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union extcon_property_value prop_val)
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{
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return 0;
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}
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static inline int extcon_set_property_capability(struct extcon_dev *edev,
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unsigned int id, unsigned int prop)
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{
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return 0;
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}
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#endif /* CONFIG_EXTCON */
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#endif /* __LINUX_EXTCON_PROVIDER_H__ */
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