mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 21:57:43 +00:00
de55d8716a
External connector class (extcon) is based on and an extension of Android kernel's switch class located at linux/drivers/switch/. This patch provides the before-extension switch class moved to the location where the extcon will be located (linux/drivers/extcon/) and updates to handle class properly. The before-extension class, switch class of Android kernel, commits imported are: switch: switch class and GPIO drivers. (splitted) Author: Mike Lockwood <lockwood@android.com> switch: Use device_create instead of device_create_drvdata. Author: Arve Hjønnevåg <arve@android.com> In this patch, upon the commits of Android kernel, we have added: - Relocated and renamed for extcon. - Comments, module name, and author information are updated - Code clean for successing patches - Bugfix: enabling write access without write functions - Class/device/sysfs create/remove handling - Added comments about uevents - Format changes for extcon_dev_register() to have a parent dev. Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com> -- Changes from v7 - Compiler error fixed when it is compiled as a module. - Removed out-of-date Kconfig entry Changes from v6 - Updated comment/strings - Revised "Android-compatible" mode. * Automatically activated if CONFIG_ANDROID && !CONFIG_ANDROID_SWITCH * Creates /sys/class/switch/*, which is a copy of /sys/class/extcon/* Changes from v5 - Split the patch - Style fixes - "Android-compatible" mode is enabled by Kconfig option. Changes from v2 - Updated name_show - Sysfs entries are handled by class itself. - Updated the method to add/remove devices for the class - Comments on uevent send - Able to become a module - Compatible with Android platform Changes from RFC - Renamed to extcon (external connector) from multistate switch - Added a seperated directory (drivers/extcon) - Added kerneldoc comments - Removed unused variables from extcon_gpio.c - Added ABI Documentation. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
82 lines
2.6 KiB
C
82 lines
2.6 KiB
C
/*
|
|
* 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__ */
|