1 // SPDX-License-Identifier: GPL-2.0
3 * device.h - generic, centralized driver model
5 * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
6 * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de>
7 * Copyright (c) 2008-2009 Novell Inc.
9 * See Documentation/driver-api/driver-model/ for more information.
15 #include <linux/dev_printk.h>
16 #include <linux/energy_model.h>
17 #include <linux/ioport.h>
18 #include <linux/kobject.h>
19 #include <linux/klist.h>
20 #include <linux/list.h>
21 #include <linux/lockdep.h>
22 #include <linux/compiler.h>
23 #include <linux/types.h>
24 #include <linux/mutex.h>
26 #include <linux/atomic.h>
27 #include <linux/uidgid.h>
28 #include <linux/gfp.h>
29 #include <linux/overflow.h>
30 #include <linux/device/bus.h>
31 #include <linux/device/class.h>
32 #include <linux/device/driver.h>
33 #include <asm/device.h>
36 struct device_private;
38 struct driver_private;
41 struct subsys_private;
50 * struct subsys_interface - interfaces to device functions
51 * @name: name of the device function
52 * @subsys: subsytem of the devices to attach to
53 * @node: the list of functions registered at the subsystem
54 * @add_dev: device hookup to device function handler
55 * @remove_dev: device hookup to device function handler
57 * Simple interfaces attached to a subsystem. Multiple interfaces can
58 * attach to a subsystem and its devices. Unlike drivers, they do not
59 * exclusively claim or control devices. Interfaces usually represent
60 * a specific functionality of a subsystem/class of devices.
62 struct subsys_interface {
64 struct bus_type *subsys;
65 struct list_head node;
66 int (*add_dev)(struct device *dev, struct subsys_interface *sif);
67 void (*remove_dev)(struct device *dev, struct subsys_interface *sif);
70 int subsys_interface_register(struct subsys_interface *sif);
71 void subsys_interface_unregister(struct subsys_interface *sif);
73 int subsys_system_register(struct bus_type *subsys,
74 const struct attribute_group **groups);
75 int subsys_virtual_register(struct bus_type *subsys,
76 const struct attribute_group **groups);
79 * The type of device, "struct device" is embedded in. A class
80 * or bus can contain devices of different types
81 * like "partitions" and "disks", "mouse" and "event".
82 * This identifies the device type and carries type-specific
83 * information, equivalent to the kobj_type of a kobject.
84 * If "name" is specified, the uevent will contain it in
85 * the DEVTYPE variable.
89 const struct attribute_group **groups;
90 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
91 char *(*devnode)(struct device *dev, umode_t *mode,
92 kuid_t *uid, kgid_t *gid);
93 void (*release)(struct device *dev);
95 const struct dev_pm_ops *pm;
98 /* interface for exporting device attributes */
99 struct device_attribute {
100 struct attribute attr;
101 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
103 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
104 const char *buf, size_t count);
107 struct dev_ext_attribute {
108 struct device_attribute attr;
112 ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
114 ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
115 const char *buf, size_t count);
116 ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
118 ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
119 const char *buf, size_t count);
120 ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
122 ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
123 const char *buf, size_t count);
125 #define DEVICE_ATTR(_name, _mode, _show, _store) \
126 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
127 #define DEVICE_ATTR_PREALLOC(_name, _mode, _show, _store) \
128 struct device_attribute dev_attr_##_name = \
129 __ATTR_PREALLOC(_name, _mode, _show, _store)
130 #define DEVICE_ATTR_RW(_name) \
131 struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
132 #define DEVICE_ATTR_ADMIN_RW(_name) \
133 struct device_attribute dev_attr_##_name = __ATTR_RW_MODE(_name, 0600)
134 #define DEVICE_ATTR_RO(_name) \
135 struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
136 #define DEVICE_ATTR_ADMIN_RO(_name) \
137 struct device_attribute dev_attr_##_name = __ATTR_RO_MODE(_name, 0400)
138 #define DEVICE_ATTR_WO(_name) \
139 struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
140 #define DEVICE_ULONG_ATTR(_name, _mode, _var) \
141 struct dev_ext_attribute dev_attr_##_name = \
142 { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
143 #define DEVICE_INT_ATTR(_name, _mode, _var) \
144 struct dev_ext_attribute dev_attr_##_name = \
145 { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
146 #define DEVICE_BOOL_ATTR(_name, _mode, _var) \
147 struct dev_ext_attribute dev_attr_##_name = \
148 { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
149 #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
150 struct device_attribute dev_attr_##_name = \
151 __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
153 int device_create_file(struct device *device,
154 const struct device_attribute *entry);
155 void device_remove_file(struct device *dev,
156 const struct device_attribute *attr);
157 bool device_remove_file_self(struct device *dev,
158 const struct device_attribute *attr);
159 int __must_check device_create_bin_file(struct device *dev,
160 const struct bin_attribute *attr);
161 void device_remove_bin_file(struct device *dev,
162 const struct bin_attribute *attr);
164 /* device resource management */
165 typedef void (*dr_release_t)(struct device *dev, void *res);
166 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
168 #ifdef CONFIG_DEBUG_DEVRES
169 void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
170 int nid, const char *name) __malloc;
171 #define devres_alloc(release, size, gfp) \
172 __devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release)
173 #define devres_alloc_node(release, size, gfp, nid) \
174 __devres_alloc_node(release, size, gfp, nid, #release)
176 void *devres_alloc_node(dr_release_t release, size_t size,
177 gfp_t gfp, int nid) __malloc;
178 static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
180 return devres_alloc_node(release, size, gfp, NUMA_NO_NODE);
184 void devres_for_each_res(struct device *dev, dr_release_t release,
185 dr_match_t match, void *match_data,
186 void (*fn)(struct device *, void *, void *),
188 void devres_free(void *res);
189 void devres_add(struct device *dev, void *res);
190 void *devres_find(struct device *dev, dr_release_t release,
191 dr_match_t match, void *match_data);
192 void *devres_get(struct device *dev, void *new_res,
193 dr_match_t match, void *match_data);
194 void *devres_remove(struct device *dev, dr_release_t release,
195 dr_match_t match, void *match_data);
196 int devres_destroy(struct device *dev, dr_release_t release,
197 dr_match_t match, void *match_data);
198 int devres_release(struct device *dev, dr_release_t release,
199 dr_match_t match, void *match_data);
202 void * __must_check devres_open_group(struct device *dev, void *id, gfp_t gfp);
203 void devres_close_group(struct device *dev, void *id);
204 void devres_remove_group(struct device *dev, void *id);
205 int devres_release_group(struct device *dev, void *id);
207 /* managed devm_k.alloc/kfree for device drivers */
208 void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
209 __printf(3, 0) char *devm_kvasprintf(struct device *dev, gfp_t gfp,
210 const char *fmt, va_list ap) __malloc;
211 __printf(3, 4) char *devm_kasprintf(struct device *dev, gfp_t gfp,
212 const char *fmt, ...) __malloc;
213 static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
215 return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
217 static inline void *devm_kmalloc_array(struct device *dev,
218 size_t n, size_t size, gfp_t flags)
222 if (unlikely(check_mul_overflow(n, size, &bytes)))
225 return devm_kmalloc(dev, bytes, flags);
227 static inline void *devm_kcalloc(struct device *dev,
228 size_t n, size_t size, gfp_t flags)
230 return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
232 void devm_kfree(struct device *dev, const void *p);
233 char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
234 const char *devm_kstrdup_const(struct device *dev, const char *s, gfp_t gfp);
235 void *devm_kmemdup(struct device *dev, const void *src, size_t len, gfp_t gfp);
237 unsigned long devm_get_free_pages(struct device *dev,
238 gfp_t gfp_mask, unsigned int order);
239 void devm_free_pages(struct device *dev, unsigned long addr);
241 void __iomem *devm_ioremap_resource(struct device *dev,
242 const struct resource *res);
243 void __iomem *devm_ioremap_resource_wc(struct device *dev,
244 const struct resource *res);
246 void __iomem *devm_of_iomap(struct device *dev,
247 struct device_node *node, int index,
248 resource_size_t *size);
250 /* allows to add/remove a custom action to devres stack */
251 int devm_add_action(struct device *dev, void (*action)(void *), void *data);
252 void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
253 void devm_release_action(struct device *dev, void (*action)(void *), void *data);
255 static inline int devm_add_action_or_reset(struct device *dev,
256 void (*action)(void *), void *data)
260 ret = devm_add_action(dev, action, data);
268 * devm_alloc_percpu - Resource-managed alloc_percpu
269 * @dev: Device to allocate per-cpu memory for
270 * @type: Type to allocate per-cpu memory for
272 * Managed alloc_percpu. Per-cpu memory allocated with this function is
273 * automatically freed on driver detach.
276 * Pointer to allocated memory on success, NULL on failure.
278 #define devm_alloc_percpu(dev, type) \
279 ((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), \
282 void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,
284 void devm_free_percpu(struct device *dev, void __percpu *pdata);
286 struct device_dma_parameters {
288 * a low level driver may set these to teach IOMMU code about
291 unsigned int max_segment_size;
292 unsigned long segment_boundary_mask;
296 * struct device_connection - Device Connection Descriptor
297 * @fwnode: The device node of the connected device
298 * @endpoint: The names of the two devices connected together
299 * @id: Unique identifier for the connection
300 * @list: List head, private, for internal use only
302 * NOTE: @fwnode is not used together with @endpoint. @fwnode is used when
303 * platform firmware defines the connection. When the connection is registered
304 * with device_connection_add() @endpoint is used instead.
306 struct device_connection {
307 struct fwnode_handle *fwnode;
308 const char *endpoint[2];
310 struct list_head list;
313 typedef void *(*devcon_match_fn_t)(struct device_connection *con, int ep,
316 void *fwnode_connection_find_match(struct fwnode_handle *fwnode,
317 const char *con_id, void *data,
318 devcon_match_fn_t match);
319 void *device_connection_find_match(struct device *dev, const char *con_id,
320 void *data, devcon_match_fn_t match);
322 void device_connection_add(struct device_connection *con);
323 void device_connection_remove(struct device_connection *con);
326 * device_connections_add - Add multiple device connections at once
327 * @cons: Zero terminated array of device connection descriptors
329 static inline void device_connections_add(struct device_connection *cons)
331 struct device_connection *c;
333 for (c = cons; c->endpoint[0]; c++)
334 device_connection_add(c);
338 * device_connections_remove - Remove multiple device connections at once
339 * @cons: Zero terminated array of device connection descriptors
341 static inline void device_connections_remove(struct device_connection *cons)
343 struct device_connection *c;
345 for (c = cons; c->endpoint[0]; c++)
346 device_connection_remove(c);
350 * enum device_link_state - Device link states.
351 * @DL_STATE_NONE: The presence of the drivers is not being tracked.
352 * @DL_STATE_DORMANT: None of the supplier/consumer drivers is present.
353 * @DL_STATE_AVAILABLE: The supplier driver is present, but the consumer is not.
354 * @DL_STATE_CONSUMER_PROBE: The consumer is probing (supplier driver present).
355 * @DL_STATE_ACTIVE: Both the supplier and consumer drivers are present.
356 * @DL_STATE_SUPPLIER_UNBIND: The supplier driver is unbinding.
358 enum device_link_state {
360 DL_STATE_DORMANT = 0,
362 DL_STATE_CONSUMER_PROBE,
364 DL_STATE_SUPPLIER_UNBIND,
370 * STATELESS: The core will not remove this link automatically.
371 * AUTOREMOVE_CONSUMER: Remove the link automatically on consumer driver unbind.
372 * PM_RUNTIME: If set, the runtime PM framework will use this link.
373 * RPM_ACTIVE: Run pm_runtime_get_sync() on the supplier during link creation.
374 * AUTOREMOVE_SUPPLIER: Remove the link automatically on supplier driver unbind.
375 * AUTOPROBE_CONSUMER: Probe consumer driver automatically after supplier binds.
376 * MANAGED: The core tracks presence of supplier/consumer drivers (internal).
377 * SYNC_STATE_ONLY: Link only affects sync_state() behavior.
379 #define DL_FLAG_STATELESS BIT(0)
380 #define DL_FLAG_AUTOREMOVE_CONSUMER BIT(1)
381 #define DL_FLAG_PM_RUNTIME BIT(2)
382 #define DL_FLAG_RPM_ACTIVE BIT(3)
383 #define DL_FLAG_AUTOREMOVE_SUPPLIER BIT(4)
384 #define DL_FLAG_AUTOPROBE_CONSUMER BIT(5)
385 #define DL_FLAG_MANAGED BIT(6)
386 #define DL_FLAG_SYNC_STATE_ONLY BIT(7)
389 * enum dl_dev_state - Device driver presence tracking information.
390 * @DL_DEV_NO_DRIVER: There is no driver attached to the device.
391 * @DL_DEV_PROBING: A driver is probing.
392 * @DL_DEV_DRIVER_BOUND: The driver has been bound to the device.
393 * @DL_DEV_UNBINDING: The driver is unbinding from the device.
396 DL_DEV_NO_DRIVER = 0,
403 * struct dev_links_info - Device data related to device links.
404 * @suppliers: List of links to supplier devices.
405 * @consumers: List of links to consumer devices.
406 * @needs_suppliers: Hook to global list of devices waiting for suppliers.
407 * @defer_hook: Hook to global list of devices that have deferred sync_state or
408 * deferred fw_devlink.
409 * @need_for_probe: If needs_suppliers is on a list, this indicates if the
410 * suppliers are needed for probe or not.
411 * @status: Driver status information.
413 struct dev_links_info {
414 struct list_head suppliers;
415 struct list_head consumers;
416 struct list_head needs_suppliers;
417 struct list_head defer_hook;
419 enum dl_dev_state status;
423 * struct device - The basic device structure
424 * @parent: The device's "parent" device, the device to which it is attached.
425 * In most cases, a parent device is some sort of bus or host
426 * controller. If parent is NULL, the device, is a top-level device,
427 * which is not usually what you want.
428 * @p: Holds the private data of the driver core portions of the device.
429 * See the comment of the struct device_private for detail.
430 * @kobj: A top-level, abstract class from which other classes are derived.
431 * @init_name: Initial name of the device.
432 * @type: The type of device.
433 * This identifies the device type and carries type-specific
435 * @mutex: Mutex to synchronize calls to its driver.
436 * @lockdep_mutex: An optional debug lock that a subsystem can use as a
437 * peer lock to gain localized lockdep coverage of the device_lock.
438 * @bus: Type of bus device is on.
439 * @driver: Which driver has allocated this
440 * @platform_data: Platform data specific to the device.
441 * Example: For devices on custom boards, as typical of embedded
442 * and SOC based hardware, Linux often uses platform_data to point
443 * to board-specific structures describing devices and how they
444 * are wired. That can include what ports are available, chip
445 * variants, which GPIO pins act in what additional roles, and so
446 * on. This shrinks the "Board Support Packages" (BSPs) and
447 * minimizes board-specific #ifdefs in drivers.
448 * @driver_data: Private pointer for driver specific info.
449 * @links: Links to suppliers and consumers of this device.
450 * @power: For device power management.
451 * See Documentation/driver-api/pm/devices.rst for details.
452 * @pm_domain: Provide callbacks that are executed during system suspend,
453 * hibernation, system resume and during runtime PM transitions
454 * along with subsystem-level and driver-level callbacks.
455 * @pins: For device pin management.
456 * See Documentation/driver-api/pinctl.rst for details.
457 * @msi_list: Hosts MSI descriptors
458 * @msi_domain: The generic MSI domain this device is using.
459 * @numa_node: NUMA node this device is close to.
460 * @dma_ops: DMA mapping operations for this device.
461 * @dma_mask: Dma mask (if dma'ble device).
462 * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
463 * hardware supports 64-bit addresses for consistent allocations
465 * @bus_dma_limit: Limit of an upstream bridge or bus which imposes a smaller
466 * DMA limit than the device itself supports.
467 * @dma_pfn_offset: offset of DMA memory range relatively of RAM
468 * @dma_parms: A low level driver may set these to teach IOMMU code about
469 * segment limitations.
470 * @dma_pools: Dma pools (if dma'ble device).
471 * @dma_mem: Internal for coherent mem override.
472 * @cma_area: Contiguous memory area for dma allocations
473 * @archdata: For arch-specific additions.
474 * @of_node: Associated device tree node.
475 * @fwnode: Associated device node supplied by platform firmware.
476 * @devt: For creating the sysfs "dev".
477 * @id: device instance
478 * @devres_lock: Spinlock to protect the resource of the device.
479 * @devres_head: The resources list of the device.
480 * @knode_class: The node used to add the device to the class list.
481 * @class: The class of the device.
482 * @groups: Optional attribute groups.
483 * @release: Callback to free the device after all references have
484 * gone away. This should be set by the allocator of the
485 * device (i.e. the bus driver that discovered the device).
486 * @iommu_group: IOMMU group the device belongs to.
487 * @iommu: Per device generic IOMMU runtime data
489 * @offline_disabled: If set, the device is permanently online.
490 * @offline: Set after successful invocation of bus type's .offline().
491 * @of_node_reused: Set if the device-tree node is shared with an ancestor
493 * @state_synced: The hardware state of this device has been synced to match
494 * the software state of this device by calling the driver/bus
495 * sync_state() callback.
496 * @dma_coherent: this particular device is dma coherent, even if the
497 * architecture supports non-coherent devices.
498 * @dma_ops_bypass: If set to %true then the dma_ops are bypassed for the
499 * streaming DMA operations (->map_* / ->unmap_* / ->sync_*),
500 * and optionall (if the coherent mask is large enough) also
501 * for dma allocations. This flag is managed by the dma ops
502 * instance from ->dma_supported.
504 * At the lowest level, every device in a Linux system is represented by an
505 * instance of struct device. The device structure contains the information
506 * that the device model core needs to model the system. Most subsystems,
507 * however, track additional information about the devices they host. As a
508 * result, it is rare for devices to be represented by bare device structures;
509 * instead, that structure, like kobject structures, is usually embedded within
510 * a higher-level representation of the device.
514 struct device *parent;
516 struct device_private *p;
518 const char *init_name; /* initial name of the device */
519 const struct device_type *type;
521 struct bus_type *bus; /* type of bus device is on */
522 struct device_driver *driver; /* which driver has allocated this
524 void *platform_data; /* Platform specific data, device
525 core doesn't touch it */
526 void *driver_data; /* Driver data, set and get with
527 dev_set_drvdata/dev_get_drvdata */
528 #ifdef CONFIG_PROVE_LOCKING
529 struct mutex lockdep_mutex;
531 struct mutex mutex; /* mutex to synchronize calls to
535 struct dev_links_info links;
536 struct dev_pm_info power;
537 struct dev_pm_domain *pm_domain;
539 #ifdef CONFIG_ENERGY_MODEL
540 struct em_perf_domain *em_pd;
543 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
544 struct irq_domain *msi_domain;
546 #ifdef CONFIG_PINCTRL
547 struct dev_pin_info *pins;
549 #ifdef CONFIG_GENERIC_MSI_IRQ
550 struct list_head msi_list;
552 #ifdef CONFIG_DMA_OPS
553 const struct dma_map_ops *dma_ops;
555 u64 *dma_mask; /* dma mask (if dma'able device) */
556 u64 coherent_dma_mask;/* Like dma_mask, but for
557 alloc_coherent mappings as
558 not all hardware supports
559 64 bit addresses for consistent
560 allocations such descriptors. */
561 u64 bus_dma_limit; /* upstream dma constraint */
562 unsigned long dma_pfn_offset;
564 struct device_dma_parameters *dma_parms;
566 struct list_head dma_pools; /* dma pools (if dma'ble) */
568 #ifdef CONFIG_DMA_DECLARE_COHERENT
569 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
572 #ifdef CONFIG_DMA_CMA
573 struct cma *cma_area; /* contiguous memory area for dma
576 /* arch specific additions */
577 struct dev_archdata archdata;
579 struct device_node *of_node; /* associated device tree node */
580 struct fwnode_handle *fwnode; /* firmware device node */
583 int numa_node; /* NUMA node this device is close to */
585 dev_t devt; /* dev_t, creates the sysfs "dev" */
586 u32 id; /* device instance */
588 spinlock_t devres_lock;
589 struct list_head devres_head;
592 const struct attribute_group **groups; /* optional groups */
594 void (*release)(struct device *dev);
595 struct iommu_group *iommu_group;
596 struct dev_iommu *iommu;
598 bool offline_disabled:1;
600 bool of_node_reused:1;
602 #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
603 defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
604 defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
607 #ifdef CONFIG_DMA_OPS_BYPASS
608 bool dma_ops_bypass : 1;
613 * struct device_link - Device link representation.
614 * @supplier: The device on the supplier end of the link.
615 * @s_node: Hook to the supplier device's list of links to consumers.
616 * @consumer: The device on the consumer end of the link.
617 * @c_node: Hook to the consumer device's list of links to suppliers.
618 * @link_dev: device used to expose link details in sysfs
619 * @status: The state of the link (with respect to the presence of drivers).
620 * @flags: Link flags.
621 * @rpm_active: Whether or not the consumer device is runtime-PM-active.
622 * @kref: Count repeated addition of the same link.
623 * @rcu_head: An RCU head to use for deferred execution of SRCU callbacks.
624 * @supplier_preactivated: Supplier has been made active before consumer probe.
627 struct device *supplier;
628 struct list_head s_node;
629 struct device *consumer;
630 struct list_head c_node;
631 struct device link_dev;
632 enum device_link_state status;
634 refcount_t rpm_active;
637 struct rcu_head rcu_head;
639 bool supplier_preactivated; /* Owned by consumer probe. */
642 static inline struct device *kobj_to_dev(struct kobject *kobj)
644 return container_of(kobj, struct device, kobj);
648 * device_iommu_mapped - Returns true when the device DMA is translated
650 * @dev: Device to perform the check on
652 static inline bool device_iommu_mapped(struct device *dev)
654 return (dev->iommu_group != NULL);
657 /* Get the wakeup routines, which depend on struct device */
658 #include <linux/pm_wakeup.h>
660 static inline const char *dev_name(const struct device *dev)
662 /* Use the init name until the kobject becomes available */
664 return dev->init_name;
666 return kobject_name(&dev->kobj);
669 __printf(2, 3) int dev_set_name(struct device *dev, const char *name, ...);
672 static inline int dev_to_node(struct device *dev)
674 return dev->numa_node;
676 static inline void set_dev_node(struct device *dev, int node)
678 dev->numa_node = node;
681 static inline int dev_to_node(struct device *dev)
685 static inline void set_dev_node(struct device *dev, int node)
690 static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
692 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
693 return dev->msi_domain;
699 static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d)
701 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
706 static inline void *dev_get_drvdata(const struct device *dev)
708 return dev->driver_data;
711 static inline void dev_set_drvdata(struct device *dev, void *data)
713 dev->driver_data = data;
716 static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
718 return dev ? dev->power.subsys_data : NULL;
721 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
723 return dev->kobj.uevent_suppress;
726 static inline void dev_set_uevent_suppress(struct device *dev, int val)
728 dev->kobj.uevent_suppress = val;
731 static inline int device_is_registered(struct device *dev)
733 return dev->kobj.state_in_sysfs;
736 static inline void device_enable_async_suspend(struct device *dev)
738 if (!dev->power.is_prepared)
739 dev->power.async_suspend = true;
742 static inline void device_disable_async_suspend(struct device *dev)
744 if (!dev->power.is_prepared)
745 dev->power.async_suspend = false;
748 static inline bool device_async_suspend_enabled(struct device *dev)
750 return !!dev->power.async_suspend;
753 static inline bool device_pm_not_required(struct device *dev)
755 return dev->power.no_pm;
758 static inline void device_set_pm_not_required(struct device *dev)
760 dev->power.no_pm = true;
763 static inline void dev_pm_syscore_device(struct device *dev, bool val)
765 #ifdef CONFIG_PM_SLEEP
766 dev->power.syscore = val;
770 static inline void dev_pm_set_driver_flags(struct device *dev, u32 flags)
772 dev->power.driver_flags = flags;
775 static inline bool dev_pm_test_driver_flags(struct device *dev, u32 flags)
777 return !!(dev->power.driver_flags & flags);
780 static inline void device_lock(struct device *dev)
782 mutex_lock(&dev->mutex);
785 static inline int device_lock_interruptible(struct device *dev)
787 return mutex_lock_interruptible(&dev->mutex);
790 static inline int device_trylock(struct device *dev)
792 return mutex_trylock(&dev->mutex);
795 static inline void device_unlock(struct device *dev)
797 mutex_unlock(&dev->mutex);
800 static inline void device_lock_assert(struct device *dev)
802 lockdep_assert_held(&dev->mutex);
805 static inline struct device_node *dev_of_node(struct device *dev)
807 if (!IS_ENABLED(CONFIG_OF) || !dev)
812 static inline bool dev_has_sync_state(struct device *dev)
816 if (dev->driver && dev->driver->sync_state)
818 if (dev->bus && dev->bus->sync_state)
824 * High level routines for use by the bus drivers
826 int __must_check device_register(struct device *dev);
827 void device_unregister(struct device *dev);
828 void device_initialize(struct device *dev);
829 int __must_check device_add(struct device *dev);
830 void device_del(struct device *dev);
831 int device_for_each_child(struct device *dev, void *data,
832 int (*fn)(struct device *dev, void *data));
833 int device_for_each_child_reverse(struct device *dev, void *data,
834 int (*fn)(struct device *dev, void *data));
835 struct device *device_find_child(struct device *dev, void *data,
836 int (*match)(struct device *dev, void *data));
837 struct device *device_find_child_by_name(struct device *parent,
839 int device_rename(struct device *dev, const char *new_name);
840 int device_move(struct device *dev, struct device *new_parent,
841 enum dpm_order dpm_order);
842 int device_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid);
843 const char *device_get_devnode(struct device *dev, umode_t *mode, kuid_t *uid,
844 kgid_t *gid, const char **tmp);
845 int device_is_dependent(struct device *dev, void *target);
847 static inline bool device_supports_offline(struct device *dev)
849 return dev->bus && dev->bus->offline && dev->bus->online;
852 void lock_device_hotplug(void);
853 void unlock_device_hotplug(void);
854 int lock_device_hotplug_sysfs(void);
855 int device_offline(struct device *dev);
856 int device_online(struct device *dev);
857 void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
858 void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
859 void device_set_of_node_from_dev(struct device *dev, const struct device *dev2);
861 static inline int dev_num_vf(struct device *dev)
863 if (dev->bus && dev->bus->num_vf)
864 return dev->bus->num_vf(dev);
869 * Root device objects for grouping under /sys/devices
871 struct device *__root_device_register(const char *name, struct module *owner);
873 /* This is a macro to avoid include problems with THIS_MODULE */
874 #define root_device_register(name) \
875 __root_device_register(name, THIS_MODULE)
877 void root_device_unregister(struct device *root);
879 static inline void *dev_get_platdata(const struct device *dev)
881 return dev->platform_data;
885 * Manual binding of a device to driver. See drivers/base/bus.c
886 * for information on use.
888 int __must_check device_bind_driver(struct device *dev);
889 void device_release_driver(struct device *dev);
890 int __must_check device_attach(struct device *dev);
891 int __must_check driver_attach(struct device_driver *drv);
892 void device_initial_probe(struct device *dev);
893 int __must_check device_reprobe(struct device *dev);
895 bool device_is_bound(struct device *dev);
898 * Easy functions for dynamically creating devices on the fly
900 __printf(5, 6) struct device *
901 device_create(struct class *cls, struct device *parent, dev_t devt,
902 void *drvdata, const char *fmt, ...);
903 __printf(6, 7) struct device *
904 device_create_with_groups(struct class *cls, struct device *parent, dev_t devt,
905 void *drvdata, const struct attribute_group **groups,
906 const char *fmt, ...);
907 void device_destroy(struct class *cls, dev_t devt);
909 int __must_check device_add_groups(struct device *dev,
910 const struct attribute_group **groups);
911 void device_remove_groups(struct device *dev,
912 const struct attribute_group **groups);
914 static inline int __must_check device_add_group(struct device *dev,
915 const struct attribute_group *grp)
917 const struct attribute_group *groups[] = { grp, NULL };
919 return device_add_groups(dev, groups);
922 static inline void device_remove_group(struct device *dev,
923 const struct attribute_group *grp)
925 const struct attribute_group *groups[] = { grp, NULL };
927 return device_remove_groups(dev, groups);
930 int __must_check devm_device_add_groups(struct device *dev,
931 const struct attribute_group **groups);
932 void devm_device_remove_groups(struct device *dev,
933 const struct attribute_group **groups);
934 int __must_check devm_device_add_group(struct device *dev,
935 const struct attribute_group *grp);
936 void devm_device_remove_group(struct device *dev,
937 const struct attribute_group *grp);
940 * Platform "fixup" functions - allow the platform to have their say
941 * about devices and actions that the general device layer doesn't
944 /* Notify platform of device discovery */
945 extern int (*platform_notify)(struct device *dev);
947 extern int (*platform_notify_remove)(struct device *dev);
951 * get_device - atomically increment the reference count for the device.
954 struct device *get_device(struct device *dev);
955 void put_device(struct device *dev);
956 bool kill_device(struct device *dev);
958 #ifdef CONFIG_DEVTMPFS
959 int devtmpfs_mount(void);
961 static inline int devtmpfs_mount(void) { return 0; }
964 /* drivers/base/power/shutdown.c */
965 void device_shutdown(void);
967 /* debugging and troubleshooting/diagnostic helpers. */
968 const char *dev_driver_string(const struct device *dev);
970 /* Device links interface. */
971 struct device_link *device_link_add(struct device *consumer,
972 struct device *supplier, u32 flags);
973 void device_link_del(struct device_link *link);
974 void device_link_remove(void *consumer, struct device *supplier);
975 void device_links_supplier_sync_state_pause(void);
976 void device_links_supplier_sync_state_resume(void);
978 extern __printf(3, 4)
979 int dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
981 /* Create alias, so I can be autoloaded. */
982 #define MODULE_ALIAS_CHARDEV(major,minor) \
983 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
984 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
985 MODULE_ALIAS("char-major-" __stringify(major) "-*")
987 #ifdef CONFIG_SYSFS_DEPRECATED
988 extern long sysfs_deprecated;
990 #define sysfs_deprecated 0
993 #endif /* _DEVICE_H_ */