/*
* External connector (extcon) class driver
*
* Copyright (C) 2015 Samsung Electronics
* Author: Chanwoo Choi <cw00.choi@samsung.com>
*
* 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__
#include <linux/device.h>
#include <linux/notifier.h>
#include <linux/sysfs.h>
/*
* Define the unique id of supported external connectors
*/
#define EXTCON_NONE 0
#define EXTCON_USB 1 /* USB connector */
#define EXTCON_USB_HOST 2
#define EXTCON_TA 3 /* Charger connector */
#define EXTCON_FAST_CHARGER 4
#define EXTCON_SLOW_CHARGER 5
#define EXTCON_CHARGE_DOWNSTREAM 6
#define EXTCON_LINE_IN 7 /* Audio/Video connector */
#define EXTCON_LINE_OUT 8
#define EXTCON_MICROPHONE 9
#define EXTCON_HEADPHONE 10
#define EXTCON_HDMI 11
#define EXTCON_MHL 12
#define EXTCON_DVI 13
#define EXTCON_VGA 14
#define EXTCON_SPDIF_IN 15
#define EXTCON_SPDIF_OUT 16
#define EXTCON_VIDEO_IN 17
#define EXTCON_VIDEO_OUT 18
#define EXTCON_DOCK 19 /* Misc connector */
#define EXTCON_JIG 20
#define EXTCON_MECHANICAL 21
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 names ending with EXTCON_NONE.
* If supported_cable is NULL, cable name related APIs
* are disabled.
* @mutually_exclusive: Array of mutually exclusive set of cables that cannot
* be attached simultaneously. The array should be
* ending with NULL or be NULL (no mutually exclusive
* cables). For example, if it is { 0x7, 0x30, 0}, then,
* {0, 1}, {0, 1, 2}, {0, 2}, {1, 2}, or {4, 5} cannot
* be attached simulataneously. {0x7, 0} is equivalent to
* {0x3, 0x6, 0x5, 0}. If it is {0xFFFFFFFF, 0}, there
* can be no simultaneous connections.
* @print_state: An optional callback to override the method to print the
* status of the extcon device.
* @dev: Device of this extcon.
* @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 users 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 unsigned int *supported_cable;
const u32 *mutually_exclusive;
/* Optional callbacks to override class functions */
ssize_t (*print_state)(struct extcon_dev *edev, char *buf);
/* Internal data. Please do not set. */
struct device dev;
struct raw_notifier_head *nh;
struct list_head entry;
int max_supported;
spinlock_t lock; /* could be called by irq handler */
u32 state;
/* /sys/class/extcon/.../cable.n/... */
struct device_type extcon_dev_type;
struct extcon_cable *cables;
/* /sys/class/extcon/.../mutually_exclusive/... */
struct attribute_group attr_g_muex;
struct attribute **attrs_muex;
struct device_attribute *d_attrs_muex;
};
/**
* 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().
* @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 *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);
extern void extcon_dev_unregister(struct extcon_dev *edev);
extern int devm_extcon_dev_register(struct device *dev,
struct extcon_dev *edev);
extern void devm_extcon_dev_unregister(struct device *dev,
struct extcon_dev *edev);
extern struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name);
/*
* Following APIs control the memory of extcon device.
*/
extern struct extcon_dev *extcon_dev_allocate(const unsigned int *cable);
extern void extcon_dev_free(struct extcon_dev *edev);
extern struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
const unsigned int *cable);
extern void devm_extcon_dev_free(struct device *dev, struct extcon_dev *edev);
/*
* 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 int extcon_set_state(struct extcon_dev *edev, u32 state);
extern int 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.
*/
extern int extcon_get_cable_state_(struct extcon_dev *edev, unsigned int id);
extern int extcon_set_cable_state_(struct extcon_dev *edev, unsigned int id,
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.
* Registrar 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 for 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, unsigned int id,
struct notifier_block *nb);
extern int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
struct notifier_block *nb);
/*
* Following API get the extcon device from devicetree.
* This function use phandle of devicetree to get extcon device directly.
*/
extern struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
int index);
/* Following API to get information of extcon device */
extern const char *extcon_get_edev_name(struct extcon_dev *edev);
#else /* CONFIG_EXTCON */
static inline int extcon_dev_register(struct extcon_dev *edev)
{
return 0;
}
static inline void extcon_dev_unregister(struct extcon_dev *edev) { }
static inline int devm_extcon_dev_register(struct device *dev,
struct extcon_dev *edev)
{
return -EINVAL;
}
static inline void devm_extcon_dev_unregister(struct device *dev,
struct extcon_dev *edev) { }
static inline struct extcon_dev *extcon_dev_allocate(const unsigned int *cable)
{
return ERR_PTR(-ENOSYS);
}
static inline void extcon_dev_free(struct extcon_dev *edev) { }
static inline struct extcon_dev *devm_extcon_dev_allocate(struct device *dev,
const unsigned int *cable)
{
return ERR_PTR(-ENOSYS);
}
static inline void devm_extcon_dev_free(struct extcon_dev *edev) { }
static inline u32 extcon_get_state(struct extcon_dev *edev)
{
return 0;
}
static inline int extcon_set_state(struct extcon_dev *edev, u32 state)
{
return 0;
}
static inline int extcon_update_state(struct extcon_dev *edev, u32 mask,
u32 state)
{
return 0;
}
static inline int extcon_get_cable_state_(struct extcon_dev *edev,
unsigned int id)
{
return 0;
}
static inline int extcon_set_cable_state_(struct extcon_dev *edev,
unsigned int id, 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,
unsigned int id,
struct notifier_block *nb)
{
return 0;
}
static inline int extcon_unregister_notifier(struct extcon_dev *edev,
unsigned int id,
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;
}
static inline struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
int index)
{
return ERR_PTR(-ENODEV);
}
#endif /* CONFIG_EXTCON */
#endif /* __LINUX_EXTCON_H__ */
