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![Chanwoo Choi](/assets/img/avatar_default.png)
This patch adds the synchronization extcon APIs to support the notifications for both state and property. When extcon_*_sync() functions is called, the extcon informs the information from extcon provider to extcon client. The extcon driver may need to change the both state and multiple properties at the same time. After setting the data of a external connector, the extcon send the notification to client driver with the extcon_*_sync(). The list of new extcon APIs as following: - extcon_sync() : Send the notification for each external connector to synchronize the information between extcon provider driver and extcon client driver. - extcon_set_state_sync() : Set the state of external connector with noti. - extcon_set_property_sync() : Set the property of external connector with noti. For example, case 1, change the state of external connector and synchronized the data. extcon_set_state_sync(edev, EXTCON_USB, 1); case 2, change both the state and property of external connector and synchronized the data. extcon_set_state(edev, EXTCON_USB, 1); extcon_set_property(edev, EXTCON_USB, EXTCON_PROP_USB_VBUS 1); extcon_sync(edev, EXTCON_USB); case 3, change the property of external connector and synchronized the data. extcon_set_property(edev, EXTCON_USB, EXTCON_PROP_USB_VBUS, 0); extcon_sync(edev, EXTCON_USB); case 4, change the property of external connector and synchronized the data. extcon_set_property_sync(edev, EXTCON_USB, EXTCON_PROP_USB_VBUS, 0); Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Tested-by: Chris Zhong <zyw@rock-chips.com> Tested-by: Guenter Roeck <groeck@chromium.org> Reviewed-by: Guenter Roeck <groeck@chromium.org>
444 lines
14 KiB
C
444 lines
14 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 type of supported external connectors
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*/
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#define EXTCON_TYPE_USB BIT(0) /* USB connector */
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#define EXTCON_TYPE_CHG BIT(1) /* Charger connector */
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#define EXTCON_TYPE_JACK BIT(2) /* Jack connector */
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#define EXTCON_TYPE_DISP BIT(3) /* Display connector */
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#define EXTCON_TYPE_MISC BIT(4) /* Miscellaneous connector */
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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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/* USB external connector */
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#define EXTCON_USB 1
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#define EXTCON_USB_HOST 2
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/* Charging external connector */
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#define EXTCON_CHG_USB_SDP 5 /* Standard Downstream Port */
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#define EXTCON_CHG_USB_DCP 6 /* Dedicated Charging Port */
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#define EXTCON_CHG_USB_CDP 7 /* Charging Downstream Port */
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#define EXTCON_CHG_USB_ACA 8 /* Accessory Charger Adapter */
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#define EXTCON_CHG_USB_FAST 9
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#define EXTCON_CHG_USB_SLOW 10
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/* Jack external connector */
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#define EXTCON_JACK_MICROPHONE 20
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#define EXTCON_JACK_HEADPHONE 21
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#define EXTCON_JACK_LINE_IN 22
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#define EXTCON_JACK_LINE_OUT 23
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#define EXTCON_JACK_VIDEO_IN 24
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#define EXTCON_JACK_VIDEO_OUT 25
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#define EXTCON_JACK_SPDIF_IN 26 /* Sony Philips Digital InterFace */
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#define EXTCON_JACK_SPDIF_OUT 27
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/* Display external connector */
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#define EXTCON_DISP_HDMI 40 /* High-Definition Multimedia Interface */
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#define EXTCON_DISP_MHL 41 /* Mobile High-Definition Link */
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#define EXTCON_DISP_DVI 42 /* Digital Visual Interface */
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#define EXTCON_DISP_VGA 43 /* Video Graphics Array */
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/* Miscellaneous external connector */
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#define EXTCON_DOCK 60
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#define EXTCON_JIG 61
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#define EXTCON_MECHANICAL 62
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#define EXTCON_NUM 63
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/*
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* Define the property of supported external connectors.
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*
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* When adding the new extcon property, they *must* have
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* the type/value/default information. Also, you *have to*
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* modify the EXTCON_PROP_[type]_START/END definitions
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* which mean the range of the supported properties
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* for each extcon type.
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*
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* The naming style of property
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* : EXTCON_PROP_[type]_[property name]
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*
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* EXTCON_PROP_USB_[property name] : USB property
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* EXTCON_PROP_CHG_[property name] : Charger property
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* EXTCON_PROP_JACK_[property name] : Jack property
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* EXTCON_PROP_DISP_[property name] : Display property
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*/
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/*
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* Properties of EXTCON_TYPE_USB.
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*
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* - EXTCON_PROP_USB_VBUS
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* @type: integer (intval)
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* @value: 0 (low) or 1 (high)
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* @default: 0 (low)
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*/
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#define EXTCON_PROP_USB_VBUS 0
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#define EXTCON_PROP_USB_MIN 0
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#define EXTCON_PROP_USB_MAX 0
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#define EXTCON_PROP_USB_CNT (EXTCON_PROP_USB_MAX - EXTCON_PROP_USB_MIN + 1)
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/* Properties of EXTCON_TYPE_CHG. */
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#define EXTCON_PROP_CHG_MIN 50
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#define EXTCON_PROP_CHG_MAX 50
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#define EXTCON_PROP_CHG_CNT (EXTCON_PROP_CHG_MAX - EXTCON_PROP_CHG_MIN + 1)
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/* Properties of EXTCON_TYPE_JACK. */
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#define EXTCON_PROP_JACK_MIN 100
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#define EXTCON_PROP_JACK_MAX 100
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#define EXTCON_PROP_JACK_CNT (EXTCON_PROP_JACK_MAX - EXTCON_PROP_JACK_MIN + 1)
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/* Properties of EXTCON_TYPE_DISP. */
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#define EXTCON_PROP_DISP_MIN 150
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#define EXTCON_PROP_DISP_MAX 150
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#define EXTCON_PROP_DISP_CNT (EXTCON_PROP_DISP_MAX - EXTCON_PROP_DISP_MIN + 1)
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/*
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* Define the type of property's value.
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*
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* Define the property's value as union type. Because each property
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* would need the different data type to store it.
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*/
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union extcon_property_value {
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int intval; /* type : integer (intval) */
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};
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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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#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_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 id.
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*/
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extern int extcon_get_state(struct extcon_dev *edev, unsigned int id);
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extern int extcon_set_state(struct extcon_dev *edev, unsigned int id,
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bool cable_state);
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extern int extcon_set_state_sync(struct extcon_dev *edev, unsigned int id,
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bool cable_state);
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/*
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* Synchronize the state and property data for a specific external connector.
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*/
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extern int extcon_sync(struct extcon_dev *edev, unsigned int id);
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/*
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* get/set_property access the property value of each external connector.
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* They are used to access the property of each cable based on the property id.
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*/
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extern int extcon_get_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(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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/*
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* get/set_property_capability set the capability of the property for each
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* external connector. They are used to set the capability of the property
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* of each external connector based on the id and property.
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*/
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extern int extcon_get_property_capability(struct extcon_dev *edev,
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unsigned int id, unsigned int prop);
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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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/*
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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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extern int devm_extcon_register_notifier(struct device *dev,
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struct extcon_dev *edev, unsigned int id,
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struct notifier_block *nb);
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extern void devm_extcon_unregister_notifier(struct device *dev,
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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 int extcon_get_state(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_state(struct extcon_dev *edev, unsigned int id,
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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_set_state_sync(struct extcon_dev *edev, unsigned int id,
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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_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_get_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(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_get_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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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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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 devm_extcon_register_notifier(struct device *dev,
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struct extcon_dev *edev, unsigned int id,
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struct notifier_block *nb)
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{
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return -ENOSYS;
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}
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static inline void devm_extcon_unregister_notifier(struct device *dev,
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struct extcon_dev *edev, unsigned int id,
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struct notifier_block *nb) { }
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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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/*
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* Following structure and API are deprecated. EXTCON remains the function
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* definition to prevent the build break.
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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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static inline int extcon_register_interest(struct extcon_specific_cable_nb *obj,
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const char *extcon_name, const char *cable_name,
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struct notifier_block *nb)
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{
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return -EINVAL;
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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 -EINVAL;
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}
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static inline int extcon_get_cable_state_(struct extcon_dev *edev, unsigned int id)
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{
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return extcon_get_state(edev, id);
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}
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static inline int extcon_set_cable_state_(struct extcon_dev *edev, unsigned int id,
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bool cable_state)
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{
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return extcon_set_state_sync(edev, id, cable_state);
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}
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#endif /* __LINUX_EXTCON_H__ */
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