326 lines
10 KiB
C
326 lines
10 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__
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/sysfs.h>
|
|
|
|
#define SUPPORTED_CABLE_MAX 32
|
|
#define CABLE_NAME_MAX 30
|
|
|
|
/*
|
|
* The standard cable name is to help support general notifier
|
|
* and notifiee 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/notifiee 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 notifiee and notifier should be able to handle such
|
|
* string and if the notifiee can negotiate the protocol or identify,
|
|
* 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,
|
|
EXTCON_MECHANICAL,
|
|
};
|
|
extern const char extcon_cable_name[][CABLE_NAME_MAX + 1];
|
|
|
|
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 NULL.
|
|
* 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_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 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 char **supported_cable;
|
|
const u32 *mutually_exclusive;
|
|
|
|
/* --- 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;
|
|
/* /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().
|
|
* @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 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
|
|
* or cable_index, which is retrieved 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.
|
|
* 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,
|
|
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 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_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__ */
|