forked from mirrors/linux
2519b7650e
This patch removes the optional print_state() function pointer which included in 'struct extcon_dev' because the extcon must maintain the consistent name of extcon device on sysfs instead of inconsistent state of external connectors. Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
350 lines
10 KiB
C
350 lines
10 KiB
C
/*
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* External connector (extcon) class driver
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*
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* Copyright (C) 2015 Samsung Electronics
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* Author: Chanwoo Choi <cw00.choi@samsung.com>
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*
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* Copyright (C) 2012 Samsung Electronics
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* Author: Donggeun Kim <dg77.kim@samsung.com>
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* Author: MyungJoo Ham <myungjoo.ham@samsung.com>
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*
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* based on switch class driver
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* Copyright (C) 2008 Google, Inc.
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* Author: Mike Lockwood <lockwood@android.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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*/
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#ifndef __LINUX_EXTCON_H__
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#define __LINUX_EXTCON_H__
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#include <linux/device.h>
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/*
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* Define the unique id of supported external connectors
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*/
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#define EXTCON_NONE 0
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#define EXTCON_USB 1 /* USB connector */
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#define EXTCON_USB_HOST 2
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#define EXTCON_TA 3 /* Charger connector */
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#define EXTCON_FAST_CHARGER 4
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#define EXTCON_SLOW_CHARGER 5
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#define EXTCON_CHARGE_DOWNSTREAM 6
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#define EXTCON_LINE_IN 7 /* Audio/Video connector */
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#define EXTCON_LINE_OUT 8
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#define EXTCON_MICROPHONE 9
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#define EXTCON_HEADPHONE 10
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#define EXTCON_HDMI 11
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#define EXTCON_MHL 12
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#define EXTCON_DVI 13
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#define EXTCON_VGA 14
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#define EXTCON_SPDIF_IN 15
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#define EXTCON_SPDIF_OUT 16
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#define EXTCON_VIDEO_IN 17
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#define EXTCON_VIDEO_OUT 18
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#define EXTCON_DOCK 19 /* Misc connector */
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#define EXTCON_JIG 20
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#define EXTCON_MECHANICAL 21
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struct extcon_cable;
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/**
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* struct extcon_dev - An extcon device represents one external connector.
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* @name: The name of this extcon device. Parent device name is
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* used if NULL.
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* @supported_cable: Array of supported cable names ending with EXTCON_NONE.
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* If supported_cable is NULL, cable name related APIs
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* are disabled.
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* @mutually_exclusive: Array of mutually exclusive set of cables that cannot
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* be attached simultaneously. The array should be
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* ending with NULL or be NULL (no mutually exclusive
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* cables). For example, if it is { 0x7, 0x30, 0}, then,
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* {0, 1}, {0, 1, 2}, {0, 2}, {1, 2}, or {4, 5} cannot
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* be attached simulataneously. {0x7, 0} is equivalent to
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* {0x3, 0x6, 0x5, 0}. If it is {0xFFFFFFFF, 0}, there
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* can be no simultaneous connections.
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* @dev: Device of this extcon.
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* @state: Attach/detach state of this extcon. Do not provide at
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* register-time.
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* @nh: Notifier for the state change events from this extcon
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* @entry: To support list of extcon devices so that users can
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* search for extcon devices based on the extcon name.
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* @lock:
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* @max_supported: Internal value to store the number of cables.
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* @extcon_dev_type: Device_type struct to provide attribute_groups
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* customized for each extcon device.
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* @cables: Sysfs subdirectories. Each represents one cable.
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*
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* In most cases, users only need to provide "User initializing data" of
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* this struct when registering an extcon. In some exceptional cases,
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* optional callbacks may be needed. However, the values in "internal data"
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* are overwritten by register function.
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*/
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struct extcon_dev {
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/* Optional user initializing data */
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const char *name;
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const unsigned int *supported_cable;
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const u32 *mutually_exclusive;
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/* Internal data. Please do not set. */
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struct device dev;
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struct raw_notifier_head *nh;
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struct list_head entry;
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int max_supported;
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spinlock_t lock; /* could be called by irq handler */
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u32 state;
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/* /sys/class/extcon/.../cable.n/... */
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struct device_type extcon_dev_type;
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struct extcon_cable *cables;
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/* /sys/class/extcon/.../mutually_exclusive/... */
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struct attribute_group attr_g_muex;
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struct attribute **attrs_muex;
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struct device_attribute *d_attrs_muex;
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};
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/**
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* struct extcon_cable - An internal data for each cable of extcon device.
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* @edev: The extcon device
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* @cable_index: Index of this cable in the edev
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* @attr_g: Attribute group for the cable
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* @attr_name: "name" sysfs entry
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* @attr_state: "state" sysfs entry
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* @attrs: Array pointing to attr_name and attr_state for attr_g
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*/
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struct extcon_cable {
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struct extcon_dev *edev;
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int cable_index;
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struct attribute_group attr_g;
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struct device_attribute attr_name;
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struct device_attribute attr_state;
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struct attribute *attrs[3]; /* to be fed to attr_g.attrs */
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};
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/**
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* struct extcon_specific_cable_nb - An internal data for
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* extcon_register_interest().
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* @user_nb: user provided notifier block for events from
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* a specific cable.
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* @cable_index: the target cable.
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* @edev: the target extcon device.
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* @previous_value: the saved previous event value.
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*/
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struct extcon_specific_cable_nb {
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struct notifier_block *user_nb;
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int cable_index;
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struct extcon_dev *edev;
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unsigned long previous_value;
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};
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#if IS_ENABLED(CONFIG_EXTCON)
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/*
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* Following APIs are for notifiers or configurations.
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* Notifiers are the external port and connection devices.
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*/
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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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extern struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name);
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/*
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* Following APIs control the memory of extcon device.
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*/
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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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/*
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* get/set/update_state access the 32b encoded state value, which represents
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* states of all possible cables of the multistate port. For example, if one
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* calls extcon_set_state(edev, 0x7), it may mean that all the three cables
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* are attached to the port.
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*/
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static inline u32 extcon_get_state(struct extcon_dev *edev)
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{
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return edev->state;
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}
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extern int extcon_set_state(struct extcon_dev *edev, u32 state);
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extern int extcon_update_state(struct extcon_dev *edev, u32 mask, u32 state);
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/*
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* get/set_cable_state access each bit of the 32b encoded state value.
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* They are used to access the status of each cable based on the cable_name.
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*/
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extern int extcon_get_cable_state_(struct extcon_dev *edev, unsigned int id);
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extern int extcon_set_cable_state_(struct extcon_dev *edev, unsigned int id,
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bool cable_state);
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extern int extcon_get_cable_state(struct extcon_dev *edev,
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const char *cable_name);
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extern int extcon_set_cable_state(struct extcon_dev *edev,
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const char *cable_name, bool cable_state);
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/*
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* Following APIs are for notifiees (those who want to be notified)
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* to register a callback for events from a specific cable of the extcon.
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* Notifiees are the connected device drivers wanting to get notified by
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* a specific external port of a connection device.
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*/
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extern int extcon_register_interest(struct extcon_specific_cable_nb *obj,
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const char *extcon_name,
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const char *cable_name,
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struct notifier_block *nb);
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extern int extcon_unregister_interest(struct extcon_specific_cable_nb *nb);
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/*
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* Following APIs are to monitor every action of a notifier.
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* Registrar gets notified for every external port of a connection device.
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* Probably this could be used to debug an action of notifier; however,
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* we do not recommend to use this for normal 'notifiee' device drivers who
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* want to be notified by a specific external port of the notifier.
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*/
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extern int extcon_register_notifier(struct extcon_dev *edev, unsigned int id,
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struct notifier_block *nb);
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extern int extcon_unregister_notifier(struct extcon_dev *edev, unsigned int id,
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struct notifier_block *nb);
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/*
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* Following API get the extcon device from devicetree.
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* This function use phandle of devicetree to get extcon device directly.
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*/
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extern struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
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int index);
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/* Following API to get information of extcon device */
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extern const char *extcon_get_edev_name(struct extcon_dev *edev);
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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 u32 extcon_get_state(struct extcon_dev *edev)
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{
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return 0;
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}
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static inline int extcon_set_state(struct extcon_dev *edev, u32 state)
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{
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return 0;
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}
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static inline int extcon_update_state(struct extcon_dev *edev, u32 mask,
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u32 state)
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{
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return 0;
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}
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static inline int extcon_get_cable_state_(struct extcon_dev *edev,
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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_cable_state_(struct extcon_dev *edev,
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unsigned int id, bool cable_state)
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{
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return 0;
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}
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static inline int extcon_get_cable_state(struct extcon_dev *edev,
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const char *cable_name)
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{
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return 0;
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}
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static inline int extcon_set_cable_state(struct extcon_dev *edev,
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const char *cable_name, int state)
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{
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return 0;
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}
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static inline struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name)
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{
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return NULL;
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}
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static inline int extcon_register_notifier(struct extcon_dev *edev,
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unsigned int id,
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struct notifier_block *nb)
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{
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return 0;
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}
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static inline int extcon_unregister_notifier(struct extcon_dev *edev,
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unsigned int id,
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struct notifier_block *nb)
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{
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return 0;
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}
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static inline int extcon_register_interest(struct extcon_specific_cable_nb *obj,
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const char *extcon_name,
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const char *cable_name,
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struct notifier_block *nb)
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{
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return 0;
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}
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static inline int extcon_unregister_interest(struct extcon_specific_cable_nb
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*obj)
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{
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return 0;
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}
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static inline struct extcon_dev *extcon_get_edev_by_phandle(struct device *dev,
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int index)
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{
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return ERR_PTR(-ENODEV);
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}
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#endif /* CONFIG_EXTCON */
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#endif /* __LINUX_EXTCON_H__ */
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