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// SPDX-License-Identifier: GPL-2.0
* device.h - generic, centralized driver model
* Copyright (c) 2001-2003 Patrick Mochel <>
* Copyright (c) 2004-2009 Greg Kroah-Hartman <>
* Copyright (c) 2008-2009 Novell Inc.
* See Documentation/driver-api/driver-model/ for more information.
#ifndef _DEVICE_H_
#define _DEVICE_H_
#include <linux/dev_printk.h>
#include <linux/energy_model.h>
#include <linux/ioport.h>
#include <linux/kobject.h>
#include <linux/klist.h>
#include <linux/list.h>
#include <linux/lockdep.h>
#include <linux/compiler.h>
#include <linux/types.h>
#include <linux/mutex.h>
#include <linux/pm.h>
#include <linux/atomic.h>
#include <linux/uidgid.h>
#include <linux/gfp.h>
#include <linux/overflow.h>
#include <linux/device/bus.h>
#include <linux/device/class.h>
#include <linux/device/driver.h>
#include <asm/device.h>
struct device;
struct device_private;
struct device_driver;
struct driver_private;
struct module;
struct class;
struct subsys_private;
struct device_node;
struct fwnode_handle;
struct iommu_ops;
struct iommu_group;
struct dev_pin_info;
struct dev_iommu;
* struct subsys_interface - interfaces to device functions
* @name: name of the device function
* @subsys: subsystem of the devices to attach to
* @node: the list of functions registered at the subsystem
* @add_dev: device hookup to device function handler
* @remove_dev: device hookup to device function handler
* Simple interfaces attached to a subsystem. Multiple interfaces can
* attach to a subsystem and its devices. Unlike drivers, they do not
* exclusively claim or control devices. Interfaces usually represent
* a specific functionality of a subsystem/class of devices.
struct subsys_interface {
const char *name;
struct bus_type *subsys;
struct list_head node;
int (*add_dev)(struct device *dev, struct subsys_interface *sif);
void (*remove_dev)(struct device *dev, struct subsys_interface *sif);
int subsys_interface_register(struct subsys_interface *sif);
void subsys_interface_unregister(struct subsys_interface *sif);
int subsys_system_register(struct bus_type *subsys,
const struct attribute_group **groups);
int subsys_virtual_register(struct bus_type *subsys,
const struct attribute_group **groups);
* The type of device, "struct device" is embedded in. A class
* or bus can contain devices of different types
* like "partitions" and "disks", "mouse" and "event".
* This identifies the device type and carries type-specific
* information, equivalent to the kobj_type of a kobject.
* If "name" is specified, the uevent will contain it in
* the DEVTYPE variable.
struct device_type {
const char *name;
const struct attribute_group **groups;
int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
char *(*devnode)(struct device *dev, umode_t *mode,
kuid_t *uid, kgid_t *gid);
void (*release)(struct device *dev);
const struct dev_pm_ops *pm;
/* interface for exporting device attributes */
struct device_attribute {
struct attribute attr;
ssize_t (*show)(struct device *dev, struct device_attribute *attr,
char *buf);
ssize_t (*store)(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count);
struct dev_ext_attribute {
struct device_attribute attr;
void *var;
ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
char *buf);
ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count);
ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
char *buf);
ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count);
ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
char *buf);
ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count);
#define DEVICE_ATTR(_name, _mode, _show, _store) \
struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
#define DEVICE_ATTR_PREALLOC(_name, _mode, _show, _store) \
struct device_attribute dev_attr_##_name = \
__ATTR_PREALLOC(_name, _mode, _show, _store)
#define DEVICE_ATTR_RW(_name) \
struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
#define DEVICE_ATTR_ADMIN_RW(_name) \
struct device_attribute dev_attr_##_name = __ATTR_RW_MODE(_name, 0600)
#define DEVICE_ATTR_RO(_name) \
struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
#define DEVICE_ATTR_ADMIN_RO(_name) \
struct device_attribute dev_attr_##_name = __ATTR_RO_MODE(_name, 0400)
#define DEVICE_ATTR_WO(_name) \
struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
#define DEVICE_ULONG_ATTR(_name, _mode, _var) \
struct dev_ext_attribute dev_attr_##_name = \
{ __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
#define DEVICE_INT_ATTR(_name, _mode, _var) \
struct dev_ext_attribute dev_attr_##_name = \
{ __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
#define DEVICE_BOOL_ATTR(_name, _mode, _var) \
struct dev_ext_attribute dev_attr_##_name = \
{ __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
#define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
struct device_attribute dev_attr_##_name = \
__ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
int device_create_file(struct device *device,
const struct device_attribute *entry);
void device_remove_file(struct device *dev,
const struct device_attribute *attr);
bool device_remove_file_self(struct device *dev,
const struct device_attribute *attr);
int __must_check device_create_bin_file(struct device *dev,
const struct bin_attribute *attr);
void device_remove_bin_file(struct device *dev,
const struct bin_attribute *attr);
/* device resource management */
typedef void (*dr_release_t)(struct device *dev, void *res);
typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
int nid, const char *name) __malloc;
#define devres_alloc(release, size, gfp) \
__devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release)
#define devres_alloc_node(release, size, gfp, nid) \
__devres_alloc_node(release, size, gfp, nid, #release)
void devres_for_each_res(struct device *dev, dr_release_t release,
dr_match_t match, void *match_data,
void (*fn)(struct device *, void *, void *),
void *data);
void devres_free(void *res);
void devres_add(struct device *dev, void *res);
void *devres_find(struct device *dev, dr_release_t release,
dr_match_t match, void *match_data);
void *devres_get(struct device *dev, void *new_res,
dr_match_t match, void *match_data);
void *devres_remove(struct device *dev, dr_release_t release,
dr_match_t match, void *match_data);
int devres_destroy(struct device *dev, dr_release_t release,
dr_match_t match, void *match_data);
int devres_release(struct device *dev, dr_release_t release,
dr_match_t match, void *match_data);
/* devres group */
void * __must_check devres_open_group(struct device *dev, void *id, gfp_t gfp);
void devres_close_group(struct device *dev, void *id);
void devres_remove_group(struct device *dev, void *id);
int devres_release_group(struct device *dev, void *id);
/* managed devm_k.alloc/kfree for device drivers */
void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
void *devm_krealloc(struct device *dev, void *ptr, size_t size,
gfp_t gfp) __must_check;
__printf(3, 0) char *devm_kvasprintf(struct device *dev, gfp_t gfp,
const char *fmt, va_list ap) __malloc;
__printf(3, 4) char *devm_kasprintf(struct device *dev, gfp_t gfp,
const char *fmt, ...) __malloc;
static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
static inline void *devm_kmalloc_array(struct device *dev,
size_t n, size_t size, gfp_t flags)
size_t bytes;
if (unlikely(check_mul_overflow(n, size, &bytes)))
return NULL;
return devm_kmalloc(dev, bytes, flags);
static inline void *devm_kcalloc(struct device *dev,
size_t n, size_t size, gfp_t flags)
return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
void devm_kfree(struct device *dev, const void *p);
char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
const char *devm_kstrdup_const(struct device *dev, const char *s, gfp_t gfp);
void *devm_kmemdup(struct device *dev, const void *src, size_t len, gfp_t gfp);
unsigned long devm_get_free_pages(struct device *dev,
gfp_t gfp_mask, unsigned int order);
void devm_free_pages(struct device *dev, unsigned long addr);
void __iomem *devm_ioremap_resource(struct device *dev,
const struct resource *res);
void __iomem *devm_ioremap_resource_wc(struct device *dev,
const struct resource *res);
void __iomem *devm_of_iomap(struct device *dev,
struct device_node *node, int index,
resource_size_t *size);
/* allows to add/remove a custom action to devres stack */
int devm_add_action(struct device *dev, void (*action)(void *), void *data);
void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
void devm_release_action(struct device *dev, void (*action)(void *), void *data);
static inline int devm_add_action_or_reset(struct device *dev,
void (*action)(void *), void *data)
int ret;
ret = devm_add_action(dev, action, data);
if (ret)
return ret;
* devm_alloc_percpu - Resource-managed alloc_percpu
* @dev: Device to allocate per-cpu memory for
* @type: Type to allocate per-cpu memory for
* Managed alloc_percpu. Per-cpu memory allocated with this function is
* automatically freed on driver detach.
* Pointer to allocated memory on success, NULL on failure.
#define devm_alloc_percpu(dev, type) \
((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), \
void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,
size_t align);
void devm_free_percpu(struct device *dev, void __percpu *pdata);
struct device_dma_parameters {
* a low level driver may set these to teach IOMMU code about
* sg limitations.
unsigned int max_segment_size;
unsigned int min_align_mask;
unsigned long segment_boundary_mask;
* enum device_link_state - Device link states.
* @DL_STATE_NONE: The presence of the drivers is not being tracked.
* @DL_STATE_DORMANT: None of the supplier/consumer drivers is present.
* @DL_STATE_AVAILABLE: The supplier driver is present, but the consumer is not.
* @DL_STATE_CONSUMER_PROBE: The consumer is probing (supplier driver present).
* @DL_STATE_ACTIVE: Both the supplier and consumer drivers are present.
* @DL_STATE_SUPPLIER_UNBIND: The supplier driver is unbinding.
enum device_link_state {
* Device link flags.
* STATELESS: The core will not remove this link automatically.
* AUTOREMOVE_CONSUMER: Remove the link automatically on consumer driver unbind.
* PM_RUNTIME: If set, the runtime PM framework will use this link.
* RPM_ACTIVE: Run pm_runtime_get_sync() on the supplier during link creation.
* AUTOREMOVE_SUPPLIER: Remove the link automatically on supplier driver unbind.
* AUTOPROBE_CONSUMER: Probe consumer driver automatically after supplier binds.
* MANAGED: The core tracks presence of supplier/consumer drivers (internal).
* SYNC_STATE_ONLY: Link only affects sync_state() behavior.
* INFERRED: Inferred from data (eg: firmware) and not from driver actions.
* 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 {
* 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 {
* 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 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.
* @lockdep_mutex: An optional debug lock that a subsystem can use as a
* peer lock to gain localized lockdep coverage of the device_lock.
* @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_lock: Lock to protect MSI mask cache and mask register
* @msi_list: Hosts MSI descriptors
* @msi_domain: The generic MSI domain this device is using.
* @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
* @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;
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 lockdep_mutex;
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;
struct em_perf_domain *em_pd;
struct irq_domain *msi_domain;
struct dev_pin_info *pins;
raw_spinlock_t msi_lock;
struct list_head msi_list;
const struct dma_map_ops *dma_ops;
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) */
struct dma_coherent_mem *dma_mem; /* internal for coherent mem
override */
struct cma *cma_area; /* contiguous memory area for dma
allocations */
struct io_tlb_mem *dma_io_tlb_mem;
/* arch specific additions */
struct dev_archdata archdata;
struct device_node *of_node; /* associated device tree node */
struct fwnode_handle *fwnode; /* firmware device node */
int numa_node; /* NUMA node this device is close to */
dev_t devt; /* dev_t, creates the sysfs "dev" */
u32 id; /* device instance */
spinlock_t devres_lock;
struct list_head devres_head;
struct class *class;
const struct attribute_group **groups; /* optional groups */
void (*release)(struct device *dev);
struct iommu_group *iommu_group;
struct dev_iommu *iommu;
enum device_removable removable;
bool offline_disabled:1;
bool offline:1;
bool of_node_reused:1;
bool state_synced:1;
bool can_match:1;
bool dma_coherent:1;
bool dma_ops_bypass : 1;
* 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. */
static inline struct device *kobj_to_dev(struct kobject *kobj)
return container_of(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>
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, ...);
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;
static inline int dev_to_node(struct device *dev)
return NUMA_NO_NODE;
static inline void set_dev_node(struct device *dev, int node)
static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
return dev->msi_domain;
return NULL;
static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d)
dev->msi_domain = d;
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)
dev->power.syscore = val;
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)
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)
static inline void device_lock_assert(struct device *dev)
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);
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);
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);
const char *device_get_devnode(struct device *dev, umode_t *mode, kuid_t *uid,
kgid_t *gid, const char **tmp);
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;
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(struct class *cls, struct device *parent, dev_t devt,
void *drvdata, const char *fmt, ...);
__printf(6, 7) struct device *
device_create_with_groups(struct class *cls, struct device *parent, dev_t devt,
void *drvdata, const struct attribute_group **groups,
const char *fmt, ...);
void device_destroy(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);
void devm_device_remove_groups(struct device *dev,
const struct attribute_group **groups);
int __must_check devm_device_add_group(struct device *dev,
const struct attribute_group *grp);
void devm_device_remove_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);
bool kill_device(struct device *dev);
int devtmpfs_mount(void);
static inline int devtmpfs_mount(void) { return 0; }
/* 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);
extern __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))
MODULE_ALIAS("char-major-" __stringify(major) "-*")
extern long sysfs_deprecated;
#define sysfs_deprecated 0
#endif /* _DEVICE_H_ */