1227 lines
40 KiB
C
1227 lines
40 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* device.h - generic, centralized driver model
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*
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* Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
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* Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de>
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* Copyright (c) 2008-2009 Novell Inc.
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*
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* See Documentation/driver-api/driver-model/ for more information.
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*/
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#ifndef _DEVICE_H_
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#define _DEVICE_H_
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#include <linux/dev_printk.h>
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#include <linux/energy_model.h>
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#include <linux/ioport.h>
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#include <linux/kobject.h>
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#include <linux/klist.h>
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#include <linux/list.h>
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#include <linux/lockdep.h>
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#include <linux/compiler.h>
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#include <linux/types.h>
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#include <linux/mutex.h>
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#include <linux/pm.h>
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#include <linux/atomic.h>
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#include <linux/uidgid.h>
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#include <linux/gfp.h>
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#include <linux/overflow.h>
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#include <linux/device/bus.h>
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#include <linux/device/class.h>
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#include <linux/device/driver.h>
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#include <linux/cleanup.h>
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#include <asm/device.h>
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struct device;
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struct device_private;
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struct device_driver;
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struct driver_private;
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struct module;
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struct class;
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struct subsys_private;
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struct device_node;
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struct fwnode_handle;
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struct iommu_ops;
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struct iommu_group;
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struct dev_pin_info;
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struct dev_iommu;
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struct msi_device_data;
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/**
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* struct subsys_interface - interfaces to device functions
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* @name: name of the device function
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* @subsys: subsystem of the devices to attach to
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* @node: the list of functions registered at the subsystem
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* @add_dev: device hookup to device function handler
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* @remove_dev: device hookup to device function handler
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*
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* Simple interfaces attached to a subsystem. Multiple interfaces can
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* attach to a subsystem and its devices. Unlike drivers, they do not
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* exclusively claim or control devices. Interfaces usually represent
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* a specific functionality of a subsystem/class of devices.
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*/
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struct subsys_interface {
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const char *name;
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struct bus_type *subsys;
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struct list_head node;
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int (*add_dev)(struct device *dev, struct subsys_interface *sif);
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void (*remove_dev)(struct device *dev, struct subsys_interface *sif);
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};
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int subsys_interface_register(struct subsys_interface *sif);
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void subsys_interface_unregister(struct subsys_interface *sif);
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int subsys_system_register(struct bus_type *subsys,
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const struct attribute_group **groups);
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int subsys_virtual_register(struct bus_type *subsys,
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const struct attribute_group **groups);
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/*
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* The type of device, "struct device" is embedded in. A class
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* or bus can contain devices of different types
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* like "partitions" and "disks", "mouse" and "event".
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* This identifies the device type and carries type-specific
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* information, equivalent to the kobj_type of a kobject.
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* If "name" is specified, the uevent will contain it in
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* the DEVTYPE variable.
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*/
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struct device_type {
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const char *name;
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const struct attribute_group **groups;
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int (*uevent)(const struct device *dev, struct kobj_uevent_env *env);
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char *(*devnode)(const struct device *dev, umode_t *mode,
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kuid_t *uid, kgid_t *gid);
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void (*release)(struct device *dev);
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const struct dev_pm_ops *pm;
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};
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/**
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* struct device_attribute - Interface for exporting device attributes.
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* @attr: sysfs attribute definition.
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* @show: Show handler.
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* @store: Store handler.
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*/
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struct device_attribute {
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struct attribute attr;
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ssize_t (*show)(struct device *dev, struct device_attribute *attr,
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char *buf);
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ssize_t (*store)(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count);
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};
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/**
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* struct dev_ext_attribute - Exported device attribute with extra context.
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* @attr: Exported device attribute.
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* @var: Pointer to context.
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*/
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struct dev_ext_attribute {
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struct device_attribute attr;
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void *var;
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};
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ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
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char *buf);
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ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count);
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ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
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char *buf);
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ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count);
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ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
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char *buf);
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ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count);
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/**
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* DEVICE_ATTR - Define a device attribute.
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* @_name: Attribute name.
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* @_mode: File mode.
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* @_show: Show handler. Optional, but mandatory if attribute is readable.
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* @_store: Store handler. Optional, but mandatory if attribute is writable.
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*
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* Convenience macro for defining a struct device_attribute.
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*
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* For example, ``DEVICE_ATTR(foo, 0644, foo_show, foo_store);`` expands to:
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*
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* .. code-block:: c
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*
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* struct device_attribute dev_attr_foo = {
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* .attr = { .name = "foo", .mode = 0644 },
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* .show = foo_show,
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* .store = foo_store,
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* };
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*/
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#define DEVICE_ATTR(_name, _mode, _show, _store) \
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struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
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/**
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* DEVICE_ATTR_PREALLOC - Define a preallocated device attribute.
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* @_name: Attribute name.
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* @_mode: File mode.
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* @_show: Show handler. Optional, but mandatory if attribute is readable.
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* @_store: Store handler. Optional, but mandatory if attribute is writable.
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*
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* Like DEVICE_ATTR(), but ``SYSFS_PREALLOC`` is set on @_mode.
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*/
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#define DEVICE_ATTR_PREALLOC(_name, _mode, _show, _store) \
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struct device_attribute dev_attr_##_name = \
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__ATTR_PREALLOC(_name, _mode, _show, _store)
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/**
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* DEVICE_ATTR_RW - Define a read-write device attribute.
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* @_name: Attribute name.
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*
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* Like DEVICE_ATTR(), but @_mode is 0644, @_show is <_name>_show,
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* and @_store is <_name>_store.
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*/
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#define DEVICE_ATTR_RW(_name) \
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struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
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/**
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* DEVICE_ATTR_ADMIN_RW - Define an admin-only read-write device attribute.
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* @_name: Attribute name.
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*
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* Like DEVICE_ATTR_RW(), but @_mode is 0600.
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*/
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#define DEVICE_ATTR_ADMIN_RW(_name) \
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struct device_attribute dev_attr_##_name = __ATTR_RW_MODE(_name, 0600)
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/**
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* DEVICE_ATTR_RO - Define a readable device attribute.
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* @_name: Attribute name.
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*
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* Like DEVICE_ATTR(), but @_mode is 0444 and @_show is <_name>_show.
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*/
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#define DEVICE_ATTR_RO(_name) \
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struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
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/**
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* DEVICE_ATTR_ADMIN_RO - Define an admin-only readable device attribute.
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* @_name: Attribute name.
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*
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* Like DEVICE_ATTR_RO(), but @_mode is 0400.
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*/
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#define DEVICE_ATTR_ADMIN_RO(_name) \
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struct device_attribute dev_attr_##_name = __ATTR_RO_MODE(_name, 0400)
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/**
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* DEVICE_ATTR_WO - Define an admin-only writable device attribute.
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* @_name: Attribute name.
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*
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* Like DEVICE_ATTR(), but @_mode is 0200 and @_store is <_name>_store.
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*/
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#define DEVICE_ATTR_WO(_name) \
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struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
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/**
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* DEVICE_ULONG_ATTR - Define a device attribute backed by an unsigned long.
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* @_name: Attribute name.
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* @_mode: File mode.
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* @_var: Identifier of unsigned long.
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*
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* Like DEVICE_ATTR(), but @_show and @_store are automatically provided
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* such that reads and writes to the attribute from userspace affect @_var.
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*/
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#define DEVICE_ULONG_ATTR(_name, _mode, _var) \
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struct dev_ext_attribute dev_attr_##_name = \
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{ __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
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/**
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* DEVICE_INT_ATTR - Define a device attribute backed by an int.
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* @_name: Attribute name.
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* @_mode: File mode.
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* @_var: Identifier of int.
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*
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* Like DEVICE_ULONG_ATTR(), but @_var is an int.
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*/
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#define DEVICE_INT_ATTR(_name, _mode, _var) \
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struct dev_ext_attribute dev_attr_##_name = \
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{ __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
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/**
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* DEVICE_BOOL_ATTR - Define a device attribute backed by a bool.
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* @_name: Attribute name.
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* @_mode: File mode.
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* @_var: Identifier of bool.
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*
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* Like DEVICE_ULONG_ATTR(), but @_var is a bool.
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*/
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#define DEVICE_BOOL_ATTR(_name, _mode, _var) \
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struct dev_ext_attribute dev_attr_##_name = \
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{ __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
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#define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
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struct device_attribute dev_attr_##_name = \
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__ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
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int device_create_file(struct device *device,
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const struct device_attribute *entry);
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void device_remove_file(struct device *dev,
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const struct device_attribute *attr);
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bool device_remove_file_self(struct device *dev,
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const struct device_attribute *attr);
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int __must_check device_create_bin_file(struct device *dev,
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const struct bin_attribute *attr);
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void device_remove_bin_file(struct device *dev,
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const struct bin_attribute *attr);
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/* device resource management */
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typedef void (*dr_release_t)(struct device *dev, void *res);
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typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
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void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
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int nid, const char *name) __malloc;
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#define devres_alloc(release, size, gfp) \
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__devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release)
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#define devres_alloc_node(release, size, gfp, nid) \
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__devres_alloc_node(release, size, gfp, nid, #release)
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void devres_for_each_res(struct device *dev, dr_release_t release,
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dr_match_t match, void *match_data,
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void (*fn)(struct device *, void *, void *),
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void *data);
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void devres_free(void *res);
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void devres_add(struct device *dev, void *res);
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void *devres_find(struct device *dev, dr_release_t release,
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dr_match_t match, void *match_data);
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void *devres_get(struct device *dev, void *new_res,
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dr_match_t match, void *match_data);
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void *devres_remove(struct device *dev, dr_release_t release,
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dr_match_t match, void *match_data);
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int devres_destroy(struct device *dev, dr_release_t release,
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dr_match_t match, void *match_data);
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int devres_release(struct device *dev, dr_release_t release,
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dr_match_t match, void *match_data);
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/* devres group */
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void * __must_check devres_open_group(struct device *dev, void *id, gfp_t gfp);
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void devres_close_group(struct device *dev, void *id);
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void devres_remove_group(struct device *dev, void *id);
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int devres_release_group(struct device *dev, void *id);
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/* managed devm_k.alloc/kfree for device drivers */
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void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __alloc_size(2);
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void *devm_krealloc(struct device *dev, void *ptr, size_t size,
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gfp_t gfp) __must_check __realloc_size(3);
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__printf(3, 0) char *devm_kvasprintf(struct device *dev, gfp_t gfp,
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const char *fmt, va_list ap) __malloc;
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__printf(3, 4) char *devm_kasprintf(struct device *dev, gfp_t gfp,
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const char *fmt, ...) __malloc;
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static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
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{
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return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
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}
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static inline void *devm_kmalloc_array(struct device *dev,
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size_t n, size_t size, gfp_t flags)
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{
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size_t bytes;
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if (unlikely(check_mul_overflow(n, size, &bytes)))
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return NULL;
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return devm_kmalloc(dev, bytes, flags);
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}
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static inline void *devm_kcalloc(struct device *dev,
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size_t n, size_t size, gfp_t flags)
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{
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return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
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}
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static inline __realloc_size(3, 4) void * __must_check
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devm_krealloc_array(struct device *dev, void *p, size_t new_n, size_t new_size, gfp_t flags)
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{
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size_t bytes;
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if (unlikely(check_mul_overflow(new_n, new_size, &bytes)))
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return NULL;
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return devm_krealloc(dev, p, bytes, flags);
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}
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void devm_kfree(struct device *dev, const void *p);
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char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
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const char *devm_kstrdup_const(struct device *dev, const char *s, gfp_t gfp);
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void *devm_kmemdup(struct device *dev, const void *src, size_t len, gfp_t gfp)
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__realloc_size(3);
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unsigned long devm_get_free_pages(struct device *dev,
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gfp_t gfp_mask, unsigned int order);
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void devm_free_pages(struct device *dev, unsigned long addr);
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void __iomem *devm_ioremap_resource(struct device *dev,
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const struct resource *res);
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void __iomem *devm_ioremap_resource_wc(struct device *dev,
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const struct resource *res);
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void __iomem *devm_of_iomap(struct device *dev,
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struct device_node *node, int index,
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resource_size_t *size);
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/* allows to add/remove a custom action to devres stack */
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void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
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void devm_release_action(struct device *dev, void (*action)(void *), void *data);
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int __devm_add_action(struct device *dev, void (*action)(void *), void *data, const char *name);
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#define devm_add_action(release, action, data) \
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__devm_add_action(release, action, data, #action)
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static inline int __devm_add_action_or_reset(struct device *dev, void (*action)(void *),
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void *data, const char *name)
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{
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int ret;
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ret = __devm_add_action(dev, action, data, name);
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if (ret)
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action(data);
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return ret;
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}
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#define devm_add_action_or_reset(release, action, data) \
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__devm_add_action_or_reset(release, action, data, #action)
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/**
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* devm_alloc_percpu - Resource-managed alloc_percpu
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* @dev: Device to allocate per-cpu memory for
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* @type: Type to allocate per-cpu memory for
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*
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* Managed alloc_percpu. Per-cpu memory allocated with this function is
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* automatically freed on driver detach.
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*
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* RETURNS:
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* Pointer to allocated memory on success, NULL on failure.
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*/
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#define devm_alloc_percpu(dev, type) \
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((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), \
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__alignof__(type)))
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void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,
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size_t align);
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void devm_free_percpu(struct device *dev, void __percpu *pdata);
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struct device_dma_parameters {
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/*
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* a low level driver may set these to teach IOMMU code about
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* sg limitations.
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*/
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unsigned int max_segment_size;
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unsigned int min_align_mask;
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unsigned long segment_boundary_mask;
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};
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/**
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* enum device_link_state - Device link states.
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* @DL_STATE_NONE: The presence of the drivers is not being tracked.
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* @DL_STATE_DORMANT: None of the supplier/consumer drivers is present.
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* @DL_STATE_AVAILABLE: The supplier driver is present, but the consumer is not.
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* @DL_STATE_CONSUMER_PROBE: The consumer is probing (supplier driver present).
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* @DL_STATE_ACTIVE: Both the supplier and consumer drivers are present.
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* @DL_STATE_SUPPLIER_UNBIND: The supplier driver is unbinding.
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*/
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enum device_link_state {
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DL_STATE_NONE = -1,
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DL_STATE_DORMANT = 0,
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DL_STATE_AVAILABLE,
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DL_STATE_CONSUMER_PROBE,
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DL_STATE_ACTIVE,
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DL_STATE_SUPPLIER_UNBIND,
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};
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/*
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* Device link flags.
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*
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* STATELESS: The core will not remove this link automatically.
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* AUTOREMOVE_CONSUMER: Remove the link automatically on consumer driver unbind.
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* PM_RUNTIME: If set, the runtime PM framework will use this link.
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* RPM_ACTIVE: Run pm_runtime_get_sync() on the supplier during link creation.
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* AUTOREMOVE_SUPPLIER: Remove the link automatically on supplier driver unbind.
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* AUTOPROBE_CONSUMER: Probe consumer driver automatically after supplier binds.
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* MANAGED: The core tracks presence of supplier/consumer drivers (internal).
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* SYNC_STATE_ONLY: Link only affects sync_state() behavior.
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* INFERRED: Inferred from data (eg: firmware) and not from driver actions.
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*/
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#define DL_FLAG_STATELESS BIT(0)
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#define DL_FLAG_AUTOREMOVE_CONSUMER BIT(1)
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#define DL_FLAG_PM_RUNTIME BIT(2)
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#define DL_FLAG_RPM_ACTIVE BIT(3)
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#define DL_FLAG_AUTOREMOVE_SUPPLIER BIT(4)
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#define DL_FLAG_AUTOPROBE_CONSUMER BIT(5)
|
|
#define DL_FLAG_MANAGED BIT(6)
|
|
#define DL_FLAG_SYNC_STATE_ONLY BIT(7)
|
|
#define DL_FLAG_INFERRED BIT(8)
|
|
#define DL_FLAG_CYCLE BIT(9)
|
|
|
|
/**
|
|
* enum dl_dev_state - Device driver presence tracking information.
|
|
* @DL_DEV_NO_DRIVER: There is no driver attached to the device.
|
|
* @DL_DEV_PROBING: A driver is probing.
|
|
* @DL_DEV_DRIVER_BOUND: The driver has been bound to the device.
|
|
* @DL_DEV_UNBINDING: The driver is unbinding from the device.
|
|
*/
|
|
enum dl_dev_state {
|
|
DL_DEV_NO_DRIVER = 0,
|
|
DL_DEV_PROBING,
|
|
DL_DEV_DRIVER_BOUND,
|
|
DL_DEV_UNBINDING,
|
|
};
|
|
|
|
/**
|
|
* enum device_removable - Whether the device is removable. The criteria for a
|
|
* device to be classified as removable is determined by its subsystem or bus.
|
|
* @DEVICE_REMOVABLE_NOT_SUPPORTED: This attribute is not supported for this
|
|
* device (default).
|
|
* @DEVICE_REMOVABLE_UNKNOWN: Device location is Unknown.
|
|
* @DEVICE_FIXED: Device is not removable by the user.
|
|
* @DEVICE_REMOVABLE: Device is removable by the user.
|
|
*/
|
|
enum device_removable {
|
|
DEVICE_REMOVABLE_NOT_SUPPORTED = 0, /* must be 0 */
|
|
DEVICE_REMOVABLE_UNKNOWN,
|
|
DEVICE_FIXED,
|
|
DEVICE_REMOVABLE,
|
|
};
|
|
|
|
/**
|
|
* struct dev_links_info - Device data related to device links.
|
|
* @suppliers: List of links to supplier devices.
|
|
* @consumers: List of links to consumer devices.
|
|
* @defer_sync: Hook to global list of devices that have deferred sync_state.
|
|
* @status: Driver status information.
|
|
*/
|
|
struct dev_links_info {
|
|
struct list_head suppliers;
|
|
struct list_head consumers;
|
|
struct list_head defer_sync;
|
|
enum dl_dev_state status;
|
|
};
|
|
|
|
/**
|
|
* struct dev_msi_info - Device data related to MSI
|
|
* @domain: The MSI interrupt domain associated to the device
|
|
* @data: Pointer to MSI device data
|
|
*/
|
|
struct dev_msi_info {
|
|
#ifdef CONFIG_GENERIC_MSI_IRQ
|
|
struct irq_domain *domain;
|
|
struct msi_device_data *data;
|
|
#endif
|
|
};
|
|
|
|
/**
|
|
* enum device_physical_location_panel - Describes which panel surface of the
|
|
* system's housing the device connection point resides on.
|
|
* @DEVICE_PANEL_TOP: Device connection point is on the top panel.
|
|
* @DEVICE_PANEL_BOTTOM: Device connection point is on the bottom panel.
|
|
* @DEVICE_PANEL_LEFT: Device connection point is on the left panel.
|
|
* @DEVICE_PANEL_RIGHT: Device connection point is on the right panel.
|
|
* @DEVICE_PANEL_FRONT: Device connection point is on the front panel.
|
|
* @DEVICE_PANEL_BACK: Device connection point is on the back panel.
|
|
* @DEVICE_PANEL_UNKNOWN: The panel with device connection point is unknown.
|
|
*/
|
|
enum device_physical_location_panel {
|
|
DEVICE_PANEL_TOP,
|
|
DEVICE_PANEL_BOTTOM,
|
|
DEVICE_PANEL_LEFT,
|
|
DEVICE_PANEL_RIGHT,
|
|
DEVICE_PANEL_FRONT,
|
|
DEVICE_PANEL_BACK,
|
|
DEVICE_PANEL_UNKNOWN,
|
|
};
|
|
|
|
/**
|
|
* enum device_physical_location_vertical_position - Describes vertical
|
|
* position of the device connection point on the panel surface.
|
|
* @DEVICE_VERT_POS_UPPER: Device connection point is at upper part of panel.
|
|
* @DEVICE_VERT_POS_CENTER: Device connection point is at center part of panel.
|
|
* @DEVICE_VERT_POS_LOWER: Device connection point is at lower part of panel.
|
|
*/
|
|
enum device_physical_location_vertical_position {
|
|
DEVICE_VERT_POS_UPPER,
|
|
DEVICE_VERT_POS_CENTER,
|
|
DEVICE_VERT_POS_LOWER,
|
|
};
|
|
|
|
/**
|
|
* enum device_physical_location_horizontal_position - Describes horizontal
|
|
* position of the device connection point on the panel surface.
|
|
* @DEVICE_HORI_POS_LEFT: Device connection point is at left part of panel.
|
|
* @DEVICE_HORI_POS_CENTER: Device connection point is at center part of panel.
|
|
* @DEVICE_HORI_POS_RIGHT: Device connection point is at right part of panel.
|
|
*/
|
|
enum device_physical_location_horizontal_position {
|
|
DEVICE_HORI_POS_LEFT,
|
|
DEVICE_HORI_POS_CENTER,
|
|
DEVICE_HORI_POS_RIGHT,
|
|
};
|
|
|
|
/**
|
|
* struct device_physical_location - Device data related to physical location
|
|
* of the device connection point.
|
|
* @panel: Panel surface of the system's housing that the device connection
|
|
* point resides on.
|
|
* @vertical_position: Vertical position of the device connection point within
|
|
* the panel.
|
|
* @horizontal_position: Horizontal position of the device connection point
|
|
* within the panel.
|
|
* @dock: Set if the device connection point resides in a docking station or
|
|
* port replicator.
|
|
* @lid: Set if this device connection point resides on the lid of laptop
|
|
* system.
|
|
*/
|
|
struct device_physical_location {
|
|
enum device_physical_location_panel panel;
|
|
enum device_physical_location_vertical_position vertical_position;
|
|
enum device_physical_location_horizontal_position horizontal_position;
|
|
bool dock;
|
|
bool lid;
|
|
};
|
|
|
|
/**
|
|
* struct device - The basic device structure
|
|
* @parent: The device's "parent" device, the device to which it is attached.
|
|
* In most cases, a parent device is some sort of bus or host
|
|
* controller. If parent is NULL, the device, is a top-level device,
|
|
* which is not usually what you want.
|
|
* @p: Holds the private data of the driver core portions of the device.
|
|
* See the comment of the struct device_private for detail.
|
|
* @kobj: A top-level, abstract class from which other classes are derived.
|
|
* @init_name: Initial name of the device.
|
|
* @type: The type of device.
|
|
* This identifies the device type and carries type-specific
|
|
* information.
|
|
* @mutex: Mutex to synchronize calls to its driver.
|
|
* @bus: Type of bus device is on.
|
|
* @driver: Which driver has allocated this
|
|
* @platform_data: Platform data specific to the device.
|
|
* Example: For devices on custom boards, as typical of embedded
|
|
* and SOC based hardware, Linux often uses platform_data to point
|
|
* to board-specific structures describing devices and how they
|
|
* are wired. That can include what ports are available, chip
|
|
* variants, which GPIO pins act in what additional roles, and so
|
|
* on. This shrinks the "Board Support Packages" (BSPs) and
|
|
* minimizes board-specific #ifdefs in drivers.
|
|
* @driver_data: Private pointer for driver specific info.
|
|
* @links: Links to suppliers and consumers of this device.
|
|
* @power: For device power management.
|
|
* See Documentation/driver-api/pm/devices.rst for details.
|
|
* @pm_domain: Provide callbacks that are executed during system suspend,
|
|
* hibernation, system resume and during runtime PM transitions
|
|
* along with subsystem-level and driver-level callbacks.
|
|
* @em_pd: device's energy model performance domain
|
|
* @pins: For device pin management.
|
|
* See Documentation/driver-api/pin-control.rst for details.
|
|
* @msi: MSI related data
|
|
* @numa_node: NUMA node this device is close to.
|
|
* @dma_ops: DMA mapping operations for this device.
|
|
* @dma_mask: Dma mask (if dma'ble device).
|
|
* @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
|
|
* hardware supports 64-bit addresses for consistent allocations
|
|
* such descriptors.
|
|
* @bus_dma_limit: Limit of an upstream bridge or bus which imposes a smaller
|
|
* DMA limit than the device itself supports.
|
|
* @dma_range_map: map for DMA memory ranges relative to that of RAM
|
|
* @dma_parms: A low level driver may set these to teach IOMMU code about
|
|
* segment limitations.
|
|
* @dma_pools: Dma pools (if dma'ble device).
|
|
* @dma_mem: Internal for coherent mem override.
|
|
* @cma_area: Contiguous memory area for dma allocations
|
|
* @dma_io_tlb_mem: Pointer to the swiotlb pool used. Not for driver use.
|
|
* @archdata: For arch-specific additions.
|
|
* @of_node: Associated device tree node.
|
|
* @fwnode: Associated device node supplied by platform firmware.
|
|
* @devt: For creating the sysfs "dev".
|
|
* @id: device instance
|
|
* @devres_lock: Spinlock to protect the resource of the device.
|
|
* @devres_head: The resources list of the device.
|
|
* @knode_class: The node used to add the device to the class list.
|
|
* @class: The class of the device.
|
|
* @groups: Optional attribute groups.
|
|
* @release: Callback to free the device after all references have
|
|
* gone away. This should be set by the allocator of the
|
|
* device (i.e. the bus driver that discovered the device).
|
|
* @iommu_group: IOMMU group the device belongs to.
|
|
* @iommu: Per device generic IOMMU runtime data
|
|
* @physical_location: Describes physical location of the device connection
|
|
* point in the system housing.
|
|
* @removable: Whether the device can be removed from the system. This
|
|
* should be set by the subsystem / bus driver that discovered
|
|
* the device.
|
|
*
|
|
* @offline_disabled: If set, the device is permanently online.
|
|
* @offline: Set after successful invocation of bus type's .offline().
|
|
* @of_node_reused: Set if the device-tree node is shared with an ancestor
|
|
* device.
|
|
* @state_synced: The hardware state of this device has been synced to match
|
|
* the software state of this device by calling the driver/bus
|
|
* sync_state() callback.
|
|
* @can_match: The device has matched with a driver at least once or it is in
|
|
* a bus (like AMBA) which can't check for matching drivers until
|
|
* other devices probe successfully.
|
|
* @dma_coherent: this particular device is dma coherent, even if the
|
|
* architecture supports non-coherent devices.
|
|
* @dma_ops_bypass: If set to %true then the dma_ops are bypassed for the
|
|
* streaming DMA operations (->map_* / ->unmap_* / ->sync_*),
|
|
* and optionall (if the coherent mask is large enough) also
|
|
* for dma allocations. This flag is managed by the dma ops
|
|
* instance from ->dma_supported.
|
|
*
|
|
* At the lowest level, every device in a Linux system is represented by an
|
|
* instance of struct device. The device structure contains the information
|
|
* that the device model core needs to model the system. Most subsystems,
|
|
* however, track additional information about the devices they host. As a
|
|
* result, it is rare for devices to be represented by bare device structures;
|
|
* instead, that structure, like kobject structures, is usually embedded within
|
|
* a higher-level representation of the device.
|
|
*/
|
|
struct device {
|
|
struct kobject kobj;
|
|
struct device *parent;
|
|
|
|
struct device_private *p;
|
|
|
|
const char *init_name; /* initial name of the device */
|
|
const struct device_type *type;
|
|
|
|
const struct bus_type *bus; /* type of bus device is on */
|
|
struct device_driver *driver; /* which driver has allocated this
|
|
device */
|
|
void *platform_data; /* Platform specific data, device
|
|
core doesn't touch it */
|
|
void *driver_data; /* Driver data, set and get with
|
|
dev_set_drvdata/dev_get_drvdata */
|
|
struct mutex mutex; /* mutex to synchronize calls to
|
|
* its driver.
|
|
*/
|
|
|
|
struct dev_links_info links;
|
|
struct dev_pm_info power;
|
|
struct dev_pm_domain *pm_domain;
|
|
|
|
#ifdef CONFIG_ENERGY_MODEL
|
|
struct em_perf_domain *em_pd;
|
|
#endif
|
|
|
|
#ifdef CONFIG_PINCTRL
|
|
struct dev_pin_info *pins;
|
|
#endif
|
|
struct dev_msi_info msi;
|
|
#ifdef CONFIG_DMA_OPS
|
|
const struct dma_map_ops *dma_ops;
|
|
#endif
|
|
u64 *dma_mask; /* dma mask (if dma'able device) */
|
|
u64 coherent_dma_mask;/* Like dma_mask, but for
|
|
alloc_coherent mappings as
|
|
not all hardware supports
|
|
64 bit addresses for consistent
|
|
allocations such descriptors. */
|
|
u64 bus_dma_limit; /* upstream dma constraint */
|
|
const struct bus_dma_region *dma_range_map;
|
|
|
|
struct device_dma_parameters *dma_parms;
|
|
|
|
struct list_head dma_pools; /* dma pools (if dma'ble) */
|
|
|
|
#ifdef CONFIG_DMA_DECLARE_COHERENT
|
|
struct dma_coherent_mem *dma_mem; /* internal for coherent mem
|
|
override */
|
|
#endif
|
|
#ifdef CONFIG_DMA_CMA
|
|
struct cma *cma_area; /* contiguous memory area for dma
|
|
allocations */
|
|
#endif
|
|
#ifdef CONFIG_SWIOTLB
|
|
struct io_tlb_mem *dma_io_tlb_mem;
|
|
#endif
|
|
/* arch specific additions */
|
|
struct dev_archdata archdata;
|
|
|
|
struct device_node *of_node; /* associated device tree node */
|
|
struct fwnode_handle *fwnode; /* firmware device node */
|
|
|
|
#ifdef CONFIG_NUMA
|
|
int numa_node; /* NUMA node this device is close to */
|
|
#endif
|
|
dev_t devt; /* dev_t, creates the sysfs "dev" */
|
|
u32 id; /* device instance */
|
|
|
|
spinlock_t devres_lock;
|
|
struct list_head devres_head;
|
|
|
|
const struct class *class;
|
|
const struct attribute_group **groups; /* optional groups */
|
|
|
|
void (*release)(struct device *dev);
|
|
struct iommu_group *iommu_group;
|
|
struct dev_iommu *iommu;
|
|
|
|
struct device_physical_location *physical_location;
|
|
|
|
enum device_removable removable;
|
|
|
|
bool offline_disabled:1;
|
|
bool offline:1;
|
|
bool of_node_reused:1;
|
|
bool state_synced:1;
|
|
bool can_match:1;
|
|
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
|
|
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
|
|
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
|
|
bool dma_coherent:1;
|
|
#endif
|
|
#ifdef CONFIG_DMA_OPS_BYPASS
|
|
bool dma_ops_bypass : 1;
|
|
#endif
|
|
};
|
|
|
|
/**
|
|
* struct device_link - Device link representation.
|
|
* @supplier: The device on the supplier end of the link.
|
|
* @s_node: Hook to the supplier device's list of links to consumers.
|
|
* @consumer: The device on the consumer end of the link.
|
|
* @c_node: Hook to the consumer device's list of links to suppliers.
|
|
* @link_dev: device used to expose link details in sysfs
|
|
* @status: The state of the link (with respect to the presence of drivers).
|
|
* @flags: Link flags.
|
|
* @rpm_active: Whether or not the consumer device is runtime-PM-active.
|
|
* @kref: Count repeated addition of the same link.
|
|
* @rm_work: Work structure used for removing the link.
|
|
* @supplier_preactivated: Supplier has been made active before consumer probe.
|
|
*/
|
|
struct device_link {
|
|
struct device *supplier;
|
|
struct list_head s_node;
|
|
struct device *consumer;
|
|
struct list_head c_node;
|
|
struct device link_dev;
|
|
enum device_link_state status;
|
|
u32 flags;
|
|
refcount_t rpm_active;
|
|
struct kref kref;
|
|
struct work_struct rm_work;
|
|
bool supplier_preactivated; /* Owned by consumer probe. */
|
|
};
|
|
|
|
#define kobj_to_dev(__kobj) container_of_const(__kobj, struct device, kobj)
|
|
|
|
/**
|
|
* device_iommu_mapped - Returns true when the device DMA is translated
|
|
* by an IOMMU
|
|
* @dev: Device to perform the check on
|
|
*/
|
|
static inline bool device_iommu_mapped(struct device *dev)
|
|
{
|
|
return (dev->iommu_group != NULL);
|
|
}
|
|
|
|
/* Get the wakeup routines, which depend on struct device */
|
|
#include <linux/pm_wakeup.h>
|
|
|
|
/**
|
|
* dev_name - Return a device's name.
|
|
* @dev: Device with name to get.
|
|
* Return: The kobject name of the device, or its initial name if unavailable.
|
|
*/
|
|
static inline const char *dev_name(const struct device *dev)
|
|
{
|
|
/* Use the init name until the kobject becomes available */
|
|
if (dev->init_name)
|
|
return dev->init_name;
|
|
|
|
return kobject_name(&dev->kobj);
|
|
}
|
|
|
|
/**
|
|
* dev_bus_name - Return a device's bus/class name, if at all possible
|
|
* @dev: struct device to get the bus/class name of
|
|
*
|
|
* Will return the name of the bus/class the device is attached to. If it is
|
|
* not attached to a bus/class, an empty string will be returned.
|
|
*/
|
|
static inline const char *dev_bus_name(const struct device *dev)
|
|
{
|
|
return dev->bus ? dev->bus->name : (dev->class ? dev->class->name : "");
|
|
}
|
|
|
|
__printf(2, 3) int dev_set_name(struct device *dev, const char *name, ...);
|
|
|
|
#ifdef CONFIG_NUMA
|
|
static inline int dev_to_node(struct device *dev)
|
|
{
|
|
return dev->numa_node;
|
|
}
|
|
static inline void set_dev_node(struct device *dev, int node)
|
|
{
|
|
dev->numa_node = node;
|
|
}
|
|
#else
|
|
static inline int dev_to_node(struct device *dev)
|
|
{
|
|
return NUMA_NO_NODE;
|
|
}
|
|
static inline void set_dev_node(struct device *dev, int node)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
|
|
{
|
|
#ifdef CONFIG_GENERIC_MSI_IRQ
|
|
return dev->msi.domain;
|
|
#else
|
|
return NULL;
|
|
#endif
|
|
}
|
|
|
|
static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d)
|
|
{
|
|
#ifdef CONFIG_GENERIC_MSI_IRQ
|
|
dev->msi.domain = d;
|
|
#endif
|
|
}
|
|
|
|
static inline void *dev_get_drvdata(const struct device *dev)
|
|
{
|
|
return dev->driver_data;
|
|
}
|
|
|
|
static inline void dev_set_drvdata(struct device *dev, void *data)
|
|
{
|
|
dev->driver_data = data;
|
|
}
|
|
|
|
static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
|
|
{
|
|
return dev ? dev->power.subsys_data : NULL;
|
|
}
|
|
|
|
static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
|
|
{
|
|
return dev->kobj.uevent_suppress;
|
|
}
|
|
|
|
static inline void dev_set_uevent_suppress(struct device *dev, int val)
|
|
{
|
|
dev->kobj.uevent_suppress = val;
|
|
}
|
|
|
|
static inline int device_is_registered(struct device *dev)
|
|
{
|
|
return dev->kobj.state_in_sysfs;
|
|
}
|
|
|
|
static inline void device_enable_async_suspend(struct device *dev)
|
|
{
|
|
if (!dev->power.is_prepared)
|
|
dev->power.async_suspend = true;
|
|
}
|
|
|
|
static inline void device_disable_async_suspend(struct device *dev)
|
|
{
|
|
if (!dev->power.is_prepared)
|
|
dev->power.async_suspend = false;
|
|
}
|
|
|
|
static inline bool device_async_suspend_enabled(struct device *dev)
|
|
{
|
|
return !!dev->power.async_suspend;
|
|
}
|
|
|
|
static inline bool device_pm_not_required(struct device *dev)
|
|
{
|
|
return dev->power.no_pm;
|
|
}
|
|
|
|
static inline void device_set_pm_not_required(struct device *dev)
|
|
{
|
|
dev->power.no_pm = true;
|
|
}
|
|
|
|
static inline void dev_pm_syscore_device(struct device *dev, bool val)
|
|
{
|
|
#ifdef CONFIG_PM_SLEEP
|
|
dev->power.syscore = val;
|
|
#endif
|
|
}
|
|
|
|
static inline void dev_pm_set_driver_flags(struct device *dev, u32 flags)
|
|
{
|
|
dev->power.driver_flags = flags;
|
|
}
|
|
|
|
static inline bool dev_pm_test_driver_flags(struct device *dev, u32 flags)
|
|
{
|
|
return !!(dev->power.driver_flags & flags);
|
|
}
|
|
|
|
static inline void device_lock(struct device *dev)
|
|
{
|
|
mutex_lock(&dev->mutex);
|
|
}
|
|
|
|
static inline int device_lock_interruptible(struct device *dev)
|
|
{
|
|
return mutex_lock_interruptible(&dev->mutex);
|
|
}
|
|
|
|
static inline int device_trylock(struct device *dev)
|
|
{
|
|
return mutex_trylock(&dev->mutex);
|
|
}
|
|
|
|
static inline void device_unlock(struct device *dev)
|
|
{
|
|
mutex_unlock(&dev->mutex);
|
|
}
|
|
|
|
static inline void device_lock_assert(struct device *dev)
|
|
{
|
|
lockdep_assert_held(&dev->mutex);
|
|
}
|
|
|
|
static inline struct device_node *dev_of_node(struct device *dev)
|
|
{
|
|
if (!IS_ENABLED(CONFIG_OF) || !dev)
|
|
return NULL;
|
|
return dev->of_node;
|
|
}
|
|
|
|
static inline bool dev_has_sync_state(struct device *dev)
|
|
{
|
|
if (!dev)
|
|
return false;
|
|
if (dev->driver && dev->driver->sync_state)
|
|
return true;
|
|
if (dev->bus && dev->bus->sync_state)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
static inline void dev_set_removable(struct device *dev,
|
|
enum device_removable removable)
|
|
{
|
|
dev->removable = removable;
|
|
}
|
|
|
|
static inline bool dev_is_removable(struct device *dev)
|
|
{
|
|
return dev->removable == DEVICE_REMOVABLE;
|
|
}
|
|
|
|
static inline bool dev_removable_is_valid(struct device *dev)
|
|
{
|
|
return dev->removable != DEVICE_REMOVABLE_NOT_SUPPORTED;
|
|
}
|
|
|
|
/*
|
|
* High level routines for use by the bus drivers
|
|
*/
|
|
int __must_check device_register(struct device *dev);
|
|
void device_unregister(struct device *dev);
|
|
void device_initialize(struct device *dev);
|
|
int __must_check device_add(struct device *dev);
|
|
void device_del(struct device *dev);
|
|
|
|
DEFINE_FREE(device_del, struct device *, if (_T) device_del(_T))
|
|
|
|
int device_for_each_child(struct device *dev, void *data,
|
|
int (*fn)(struct device *dev, void *data));
|
|
int device_for_each_child_reverse(struct device *dev, void *data,
|
|
int (*fn)(struct device *dev, void *data));
|
|
struct device *device_find_child(struct device *dev, void *data,
|
|
int (*match)(struct device *dev, void *data));
|
|
struct device *device_find_child_by_name(struct device *parent,
|
|
const char *name);
|
|
struct device *device_find_any_child(struct device *parent);
|
|
|
|
int device_rename(struct device *dev, const char *new_name);
|
|
int device_move(struct device *dev, struct device *new_parent,
|
|
enum dpm_order dpm_order);
|
|
int device_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid);
|
|
int device_is_dependent(struct device *dev, void *target);
|
|
|
|
static inline bool device_supports_offline(struct device *dev)
|
|
{
|
|
return dev->bus && dev->bus->offline && dev->bus->online;
|
|
}
|
|
|
|
#define __device_lock_set_class(dev, name, key) \
|
|
do { \
|
|
struct device *__d2 __maybe_unused = dev; \
|
|
lock_set_class(&__d2->mutex.dep_map, name, key, 0, _THIS_IP_); \
|
|
} while (0)
|
|
|
|
/**
|
|
* device_lock_set_class - Specify a temporary lock class while a device
|
|
* is attached to a driver
|
|
* @dev: device to modify
|
|
* @key: lock class key data
|
|
*
|
|
* This must be called with the device_lock() already held, for example
|
|
* from driver ->probe(). Take care to only override the default
|
|
* lockdep_no_validate class.
|
|
*/
|
|
#ifdef CONFIG_LOCKDEP
|
|
#define device_lock_set_class(dev, key) \
|
|
do { \
|
|
struct device *__d = dev; \
|
|
dev_WARN_ONCE(__d, !lockdep_match_class(&__d->mutex, \
|
|
&__lockdep_no_validate__), \
|
|
"overriding existing custom lock class\n"); \
|
|
__device_lock_set_class(__d, #key, key); \
|
|
} while (0)
|
|
#else
|
|
#define device_lock_set_class(dev, key) __device_lock_set_class(dev, #key, key)
|
|
#endif
|
|
|
|
/**
|
|
* device_lock_reset_class - Return a device to the default lockdep novalidate state
|
|
* @dev: device to modify
|
|
*
|
|
* This must be called with the device_lock() already held, for example
|
|
* from driver ->remove().
|
|
*/
|
|
#define device_lock_reset_class(dev) \
|
|
do { \
|
|
struct device *__d __maybe_unused = dev; \
|
|
lock_set_novalidate_class(&__d->mutex.dep_map, "&dev->mutex", \
|
|
_THIS_IP_); \
|
|
} while (0)
|
|
|
|
void lock_device_hotplug(void);
|
|
void unlock_device_hotplug(void);
|
|
int lock_device_hotplug_sysfs(void);
|
|
int device_offline(struct device *dev);
|
|
int device_online(struct device *dev);
|
|
void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
|
|
void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
|
|
void device_set_of_node_from_dev(struct device *dev, const struct device *dev2);
|
|
void device_set_node(struct device *dev, struct fwnode_handle *fwnode);
|
|
|
|
static inline int dev_num_vf(struct device *dev)
|
|
{
|
|
if (dev->bus && dev->bus->num_vf)
|
|
return dev->bus->num_vf(dev);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Root device objects for grouping under /sys/devices
|
|
*/
|
|
struct device *__root_device_register(const char *name, struct module *owner);
|
|
|
|
/* This is a macro to avoid include problems with THIS_MODULE */
|
|
#define root_device_register(name) \
|
|
__root_device_register(name, THIS_MODULE)
|
|
|
|
void root_device_unregister(struct device *root);
|
|
|
|
static inline void *dev_get_platdata(const struct device *dev)
|
|
{
|
|
return dev->platform_data;
|
|
}
|
|
|
|
/*
|
|
* Manual binding of a device to driver. See drivers/base/bus.c
|
|
* for information on use.
|
|
*/
|
|
int __must_check device_driver_attach(struct device_driver *drv,
|
|
struct device *dev);
|
|
int __must_check device_bind_driver(struct device *dev);
|
|
void device_release_driver(struct device *dev);
|
|
int __must_check device_attach(struct device *dev);
|
|
int __must_check driver_attach(struct device_driver *drv);
|
|
void device_initial_probe(struct device *dev);
|
|
int __must_check device_reprobe(struct device *dev);
|
|
|
|
bool device_is_bound(struct device *dev);
|
|
|
|
/*
|
|
* Easy functions for dynamically creating devices on the fly
|
|
*/
|
|
__printf(5, 6) struct device *
|
|
device_create(const struct class *cls, struct device *parent, dev_t devt,
|
|
void *drvdata, const char *fmt, ...);
|
|
__printf(6, 7) struct device *
|
|
device_create_with_groups(const struct class *cls, struct device *parent, dev_t devt,
|
|
void *drvdata, const struct attribute_group **groups,
|
|
const char *fmt, ...);
|
|
void device_destroy(const struct class *cls, dev_t devt);
|
|
|
|
int __must_check device_add_groups(struct device *dev,
|
|
const struct attribute_group **groups);
|
|
void device_remove_groups(struct device *dev,
|
|
const struct attribute_group **groups);
|
|
|
|
static inline int __must_check device_add_group(struct device *dev,
|
|
const struct attribute_group *grp)
|
|
{
|
|
const struct attribute_group *groups[] = { grp, NULL };
|
|
|
|
return device_add_groups(dev, groups);
|
|
}
|
|
|
|
static inline void device_remove_group(struct device *dev,
|
|
const struct attribute_group *grp)
|
|
{
|
|
const struct attribute_group *groups[] = { grp, NULL };
|
|
|
|
return device_remove_groups(dev, groups);
|
|
}
|
|
|
|
int __must_check devm_device_add_groups(struct device *dev,
|
|
const struct attribute_group **groups);
|
|
int __must_check devm_device_add_group(struct device *dev,
|
|
const struct attribute_group *grp);
|
|
|
|
/*
|
|
* Platform "fixup" functions - allow the platform to have their say
|
|
* about devices and actions that the general device layer doesn't
|
|
* know about.
|
|
*/
|
|
/* Notify platform of device discovery */
|
|
extern int (*platform_notify)(struct device *dev);
|
|
|
|
extern int (*platform_notify_remove)(struct device *dev);
|
|
|
|
|
|
/*
|
|
* get_device - atomically increment the reference count for the device.
|
|
*
|
|
*/
|
|
struct device *get_device(struct device *dev);
|
|
void put_device(struct device *dev);
|
|
|
|
DEFINE_FREE(put_device, struct device *, if (_T) put_device(_T))
|
|
|
|
bool kill_device(struct device *dev);
|
|
|
|
#ifdef CONFIG_DEVTMPFS
|
|
int devtmpfs_mount(void);
|
|
#else
|
|
static inline int devtmpfs_mount(void) { return 0; }
|
|
#endif
|
|
|
|
/* drivers/base/power/shutdown.c */
|
|
void device_shutdown(void);
|
|
|
|
/* debugging and troubleshooting/diagnostic helpers. */
|
|
const char *dev_driver_string(const struct device *dev);
|
|
|
|
/* Device links interface. */
|
|
struct device_link *device_link_add(struct device *consumer,
|
|
struct device *supplier, u32 flags);
|
|
void device_link_del(struct device_link *link);
|
|
void device_link_remove(void *consumer, struct device *supplier);
|
|
void device_links_supplier_sync_state_pause(void);
|
|
void device_links_supplier_sync_state_resume(void);
|
|
|
|
__printf(3, 4) int dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
|
|
|
|
/* Create alias, so I can be autoloaded. */
|
|
#define MODULE_ALIAS_CHARDEV(major,minor) \
|
|
MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
|
|
#define MODULE_ALIAS_CHARDEV_MAJOR(major) \
|
|
MODULE_ALIAS("char-major-" __stringify(major) "-*")
|
|
|
|
#endif /* _DEVICE_H_ */
|