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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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42d7d7539a
This patch remove extcon_dev_register()'s second parameter which means the pointer of parent device to simplify prototype of this function. So, if extcon device has the parent device, it should set the pointer of parent device to edev.dev.parent in extcon device driver instead of in extcon_dev_register(). Cc: Graeme Gregory <gg@slimlogic.co.uk> Cc: Kishon Vijay Abraham I <kishon@ti.com> Cc: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Cc: Mark Brown <broonie@kernel.org> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
329 lines
10 KiB
C
329 lines
10 KiB
C
/*
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* External connector (extcon) class driver
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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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#include <linux/notifier.h>
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#include <linux/sysfs.h>
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#define SUPPORTED_CABLE_MAX 32
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#define CABLE_NAME_MAX 30
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/*
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* The standard cable name is to help support general notifier
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* and notifiee device drivers to share the common names.
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* Please use standard cable names unless your notifier device has
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* a very unique and abnormal cable or
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* the cable type is supposed to be used with only one unique
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* pair of notifier/notifiee devices.
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*
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* Please add any other "standard" cables used with extcon dev.
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*
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* You may add a dot and number to specify version or specification
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* of the specific cable if it is required. (e.g., "Fast-charger.18"
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* and "Fast-charger.10" for 1.8A and 1.0A chargers)
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* However, the notifiee and notifier should be able to handle such
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* string and if the notifiee can negotiate the protocol or identify,
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* you don't need such convention. This convention is helpful when
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* notifier can distinguish but notifiee cannot.
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*/
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enum extcon_cable_name {
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EXTCON_USB = 0,
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EXTCON_USB_HOST,
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EXTCON_TA, /* Travel Adaptor */
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EXTCON_FAST_CHARGER,
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EXTCON_SLOW_CHARGER,
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EXTCON_CHARGE_DOWNSTREAM, /* Charging an external device */
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EXTCON_HDMI,
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EXTCON_MHL,
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EXTCON_DVI,
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EXTCON_VGA,
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EXTCON_DOCK,
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EXTCON_LINE_IN,
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EXTCON_LINE_OUT,
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EXTCON_MIC_IN,
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EXTCON_HEADPHONE_OUT,
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EXTCON_SPDIF_IN,
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EXTCON_SPDIF_OUT,
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EXTCON_VIDEO_IN,
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EXTCON_VIDEO_OUT,
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EXTCON_MECHANICAL,
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};
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extern const char extcon_cable_name[][CABLE_NAME_MAX + 1];
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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 NULL.
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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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* @print_name: An optional callback to override the method to print the
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* name of the extcon device.
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* @print_state: An optional callback to override the method to print the
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* status of the extcon device.
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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 search
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* 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 char **supported_cable;
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const u32 *mutually_exclusive;
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/* Optional callbacks to override class functions */
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ssize_t (*print_name)(struct extcon_dev *edev, char *buf);
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ssize_t (*print_state)(struct extcon_dev *edev, char *buf);
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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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* @internal_nb: A notifier block bridging extcon notifier
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* and cable notifier.
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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 internal_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 struct extcon_dev *extcon_get_extcon_dev(const char *extcon_name);
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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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* or cable_index, which is retrieved by extcon_find_cable_index
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*/
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extern int extcon_find_cable_index(struct extcon_dev *sdev,
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const char *cable_name);
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extern int extcon_get_cable_state_(struct extcon_dev *edev, int cable_index);
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extern int extcon_set_cable_state_(struct extcon_dev *edev, int cable_index,
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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,
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struct notifier_block *nb);
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extern int extcon_unregister_notifier(struct extcon_dev *edev,
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struct notifier_block *nb);
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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 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_find_cable_index(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_get_cable_state_(struct extcon_dev *edev,
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int cable_index)
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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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int cable_index, 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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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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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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#endif /* CONFIG_EXTCON */
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#endif /* __LINUX_EXTCON_H__ */
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