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/ioport.h>
17 #include <linux/kobject.h>
18 #include <linux/klist.h>
19 #include <linux/list.h>
20 #include <linux/lockdep.h>
21 #include <linux/compiler.h>
22 #include <linux/types.h>
23 #include <linux/mutex.h>
25 #include <linux/atomic.h>
26 #include <linux/uidgid.h>
27 #include <linux/gfp.h>
28 #include <linux/overflow.h>
29 #include <linux/device/bus.h>
30 #include <linux/device/class.h>
31 #include <linux/device/driver.h>
32 #include <asm/device.h>
35 struct device_private;
37 struct driver_private;
40 struct subsys_private;
49 * struct subsys_interface - interfaces to device functions
50 * @name: name of the device function
51 * @subsys: subsytem of the devices to attach to
52 * @node: the list of functions registered at the subsystem
53 * @add_dev: device hookup to device function handler
54 * @remove_dev: device hookup to device function handler
56 * Simple interfaces attached to a subsystem. Multiple interfaces can
57 * attach to a subsystem and its devices. Unlike drivers, they do not
58 * exclusively claim or control devices. Interfaces usually represent
59 * a specific functionality of a subsystem/class of devices.
61 struct subsys_interface {
63 struct bus_type *subsys;
64 struct list_head node;
65 int (*add_dev)(struct device *dev, struct subsys_interface *sif);
66 void (*remove_dev)(struct device *dev, struct subsys_interface *sif);
69 int subsys_interface_register(struct subsys_interface *sif);
70 void subsys_interface_unregister(struct subsys_interface *sif);
72 int subsys_system_register(struct bus_type *subsys,
73 const struct attribute_group **groups);
74 int subsys_virtual_register(struct bus_type *subsys,
75 const struct attribute_group **groups);
78 * The type of device, "struct device" is embedded in. A class
79 * or bus can contain devices of different types
80 * like "partitions" and "disks", "mouse" and "event".
81 * This identifies the device type and carries type-specific
82 * information, equivalent to the kobj_type of a kobject.
83 * If "name" is specified, the uevent will contain it in
84 * the DEVTYPE variable.
88 const struct attribute_group **groups;
89 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
90 char *(*devnode)(struct device *dev, umode_t *mode,
91 kuid_t *uid, kgid_t *gid);
92 void (*release)(struct device *dev);
94 const struct dev_pm_ops *pm;
97 /* interface for exporting device attributes */
98 struct device_attribute {
99 struct attribute attr;
100 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
102 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
103 const char *buf, size_t count);
106 struct dev_ext_attribute {
107 struct device_attribute attr;
111 ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
113 ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
114 const char *buf, size_t count);
115 ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
117 ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
118 const char *buf, size_t count);
119 ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
121 ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
122 const char *buf, size_t count);
124 #define DEVICE_ATTR(_name, _mode, _show, _store) \
125 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
126 #define DEVICE_ATTR_PREALLOC(_name, _mode, _show, _store) \
127 struct device_attribute dev_attr_##_name = \
128 __ATTR_PREALLOC(_name, _mode, _show, _store)
129 #define DEVICE_ATTR_RW(_name) \
130 struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
131 #define DEVICE_ATTR_ADMIN_RW(_name) \
132 struct device_attribute dev_attr_##_name = __ATTR_RW_MODE(_name, 0600)
133 #define DEVICE_ATTR_RO(_name) \
134 struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
135 #define DEVICE_ATTR_ADMIN_RO(_name) \
136 struct device_attribute dev_attr_##_name = __ATTR_RO_MODE(_name, 0400)
137 #define DEVICE_ATTR_WO(_name) \
138 struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
139 #define DEVICE_ULONG_ATTR(_name, _mode, _var) \
140 struct dev_ext_attribute dev_attr_##_name = \
141 { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
142 #define DEVICE_INT_ATTR(_name, _mode, _var) \
143 struct dev_ext_attribute dev_attr_##_name = \
144 { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
145 #define DEVICE_BOOL_ATTR(_name, _mode, _var) \
146 struct dev_ext_attribute dev_attr_##_name = \
147 { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
148 #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
149 struct device_attribute dev_attr_##_name = \
150 __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
152 int device_create_file(struct device *device,
153 const struct device_attribute *entry);
154 void device_remove_file(struct device *dev,
155 const struct device_attribute *attr);
156 bool device_remove_file_self(struct device *dev,
157 const struct device_attribute *attr);
158 int __must_check device_create_bin_file(struct device *dev,
159 const struct bin_attribute *attr);
160 void device_remove_bin_file(struct device *dev,
161 const struct bin_attribute *attr);
163 /* device resource management */
164 typedef void (*dr_release_t)(struct device *dev, void *res);
165 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
167 #ifdef CONFIG_DEBUG_DEVRES
168 void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
169 int nid, const char *name) __malloc;
170 #define devres_alloc(release, size, gfp) \
171 __devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release)
172 #define devres_alloc_node(release, size, gfp, nid) \
173 __devres_alloc_node(release, size, gfp, nid, #release)
175 void *devres_alloc_node(dr_release_t release, size_t size,
176 gfp_t gfp, int nid) __malloc;
177 static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
179 return devres_alloc_node(release, size, gfp, NUMA_NO_NODE);
183 void devres_for_each_res(struct device *dev, dr_release_t release,
184 dr_match_t match, void *match_data,
185 void (*fn)(struct device *, void *, void *),
187 void devres_free(void *res);
188 void devres_add(struct device *dev, void *res);
189 void *devres_find(struct device *dev, dr_release_t release,
190 dr_match_t match, void *match_data);
191 void *devres_get(struct device *dev, void *new_res,
192 dr_match_t match, void *match_data);
193 void *devres_remove(struct device *dev, dr_release_t release,
194 dr_match_t match, void *match_data);
195 int devres_destroy(struct device *dev, dr_release_t release,
196 dr_match_t match, void *match_data);
197 int devres_release(struct device *dev, dr_release_t release,
198 dr_match_t match, void *match_data);
201 void * __must_check devres_open_group(struct device *dev, void *id, gfp_t gfp);
202 void devres_close_group(struct device *dev, void *id);
203 void devres_remove_group(struct device *dev, void *id);
204 int devres_release_group(struct device *dev, void *id);
206 /* managed devm_k.alloc/kfree for device drivers */
207 void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
208 __printf(3, 0) char *devm_kvasprintf(struct device *dev, gfp_t gfp,
209 const char *fmt, va_list ap) __malloc;
210 __printf(3, 4) char *devm_kasprintf(struct device *dev, gfp_t gfp,
211 const char *fmt, ...) __malloc;
212 static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
214 return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
216 static inline void *devm_kmalloc_array(struct device *dev,
217 size_t n, size_t size, gfp_t flags)
221 if (unlikely(check_mul_overflow(n, size, &bytes)))
224 return devm_kmalloc(dev, bytes, flags);
226 static inline void *devm_kcalloc(struct device *dev,
227 size_t n, size_t size, gfp_t flags)
229 return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
231 void devm_kfree(struct device *dev, const void *p);
232 char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
233 const char *devm_kstrdup_const(struct device *dev, const char *s, gfp_t gfp);
234 void *devm_kmemdup(struct device *dev, const void *src, size_t len, gfp_t gfp);
236 unsigned long devm_get_free_pages(struct device *dev,
237 gfp_t gfp_mask, unsigned int order);
238 void devm_free_pages(struct device *dev, unsigned long addr);
240 void __iomem *devm_ioremap_resource(struct device *dev,
241 const struct resource *res);
242 void __iomem *devm_ioremap_resource_wc(struct device *dev,
243 const struct resource *res);
245 void __iomem *devm_of_iomap(struct device *dev,
246 struct device_node *node, int index,
247 resource_size_t *size);
249 /* allows to add/remove a custom action to devres stack */
250 int devm_add_action(struct device *dev, void (*action)(void *), void *data);
251 void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
252 void devm_release_action(struct device *dev, void (*action)(void *), void *data);
254 static inline int devm_add_action_or_reset(struct device *dev,
255 void (*action)(void *), void *data)
259 ret = devm_add_action(dev, action, data);
267 * devm_alloc_percpu - Resource-managed alloc_percpu
268 * @dev: Device to allocate per-cpu memory for
269 * @type: Type to allocate per-cpu memory for
271 * Managed alloc_percpu. Per-cpu memory allocated with this function is
272 * automatically freed on driver detach.
275 * Pointer to allocated memory on success, NULL on failure.
277 #define devm_alloc_percpu(dev, type) \
278 ((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), \
281 void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,
283 void devm_free_percpu(struct device *dev, void __percpu *pdata);
285 struct device_dma_parameters {
287 * a low level driver may set these to teach IOMMU code about
290 unsigned int max_segment_size;
291 unsigned long segment_boundary_mask;
295 * struct device_connection - Device Connection Descriptor
296 * @fwnode: The device node of the connected device
297 * @endpoint: The names of the two devices connected together
298 * @id: Unique identifier for the connection
299 * @list: List head, private, for internal use only
301 * NOTE: @fwnode is not used together with @endpoint. @fwnode is used when
302 * platform firmware defines the connection. When the connection is registered
303 * with device_connection_add() @endpoint is used instead.
305 struct device_connection {
306 struct fwnode_handle *fwnode;
307 const char *endpoint[2];
309 struct list_head list;
312 typedef void *(*devcon_match_fn_t)(struct device_connection *con, int ep,
315 void *fwnode_connection_find_match(struct fwnode_handle *fwnode,
316 const char *con_id, void *data,
317 devcon_match_fn_t match);
318 void *device_connection_find_match(struct device *dev, const char *con_id,
319 void *data, devcon_match_fn_t match);
321 struct device *device_connection_find(struct device *dev, const char *con_id);
323 void device_connection_add(struct device_connection *con);
324 void device_connection_remove(struct device_connection *con);
327 * device_connections_add - Add multiple device connections at once
328 * @cons: Zero terminated array of device connection descriptors
330 static inline void device_connections_add(struct device_connection *cons)
332 struct device_connection *c;
334 for (c = cons; c->endpoint[0]; c++)
335 device_connection_add(c);
339 * device_connections_remove - Remove multiple device connections at once
340 * @cons: Zero terminated array of device connection descriptors
342 static inline void device_connections_remove(struct device_connection *cons)
344 struct device_connection *c;
346 for (c = cons; c->endpoint[0]; c++)
347 device_connection_remove(c);
351 * enum device_link_state - Device link states.
352 * @DL_STATE_NONE: The presence of the drivers is not being tracked.
353 * @DL_STATE_DORMANT: None of the supplier/consumer drivers is present.
354 * @DL_STATE_AVAILABLE: The supplier driver is present, but the consumer is not.
355 * @DL_STATE_CONSUMER_PROBE: The consumer is probing (supplier driver present).
356 * @DL_STATE_ACTIVE: Both the supplier and consumer drivers are present.
357 * @DL_STATE_SUPPLIER_UNBIND: The supplier driver is unbinding.
359 enum device_link_state {
361 DL_STATE_DORMANT = 0,
363 DL_STATE_CONSUMER_PROBE,
365 DL_STATE_SUPPLIER_UNBIND,
371 * STATELESS: The core will not remove this link automatically.
372 * AUTOREMOVE_CONSUMER: Remove the link automatically on consumer driver unbind.
373 * PM_RUNTIME: If set, the runtime PM framework will use this link.
374 * RPM_ACTIVE: Run pm_runtime_get_sync() on the supplier during link creation.
375 * AUTOREMOVE_SUPPLIER: Remove the link automatically on supplier driver unbind.
376 * AUTOPROBE_CONSUMER: Probe consumer driver automatically after supplier binds.
377 * MANAGED: The core tracks presence of supplier/consumer drivers (internal).
378 * SYNC_STATE_ONLY: Link only affects sync_state() behavior.
380 #define DL_FLAG_STATELESS BIT(0)
381 #define DL_FLAG_AUTOREMOVE_CONSUMER BIT(1)
382 #define DL_FLAG_PM_RUNTIME BIT(2)
383 #define DL_FLAG_RPM_ACTIVE BIT(3)
384 #define DL_FLAG_AUTOREMOVE_SUPPLIER BIT(4)
385 #define DL_FLAG_AUTOPROBE_CONSUMER BIT(5)
386 #define DL_FLAG_MANAGED BIT(6)
387 #define DL_FLAG_SYNC_STATE_ONLY BIT(7)
390 * enum dl_dev_state - Device driver presence tracking information.
391 * @DL_DEV_NO_DRIVER: There is no driver attached to the device.
392 * @DL_DEV_PROBING: A driver is probing.
393 * @DL_DEV_DRIVER_BOUND: The driver has been bound to the device.
394 * @DL_DEV_UNBINDING: The driver is unbinding from the device.
397 DL_DEV_NO_DRIVER = 0,
404 * struct dev_links_info - Device data related to device links.
405 * @suppliers: List of links to supplier devices.
406 * @consumers: List of links to consumer devices.
407 * @needs_suppliers: Hook to global list of devices waiting for suppliers.
408 * @defer_hook: Hook to global list of devices that have deferred sync_state or
409 * deferred fw_devlink.
410 * @need_for_probe: If needs_suppliers is on a list, this indicates if the
411 * suppliers are needed for probe or not.
412 * @status: Driver status information.
414 struct dev_links_info {
415 struct list_head suppliers;
416 struct list_head consumers;
417 struct list_head needs_suppliers;
418 struct list_head defer_hook;
420 enum dl_dev_state status;
424 * struct device - The basic device structure
425 * @parent: The device's "parent" device, the device to which it is attached.
426 * In most cases, a parent device is some sort of bus or host
427 * controller. If parent is NULL, the device, is a top-level device,
428 * which is not usually what you want.
429 * @p: Holds the private data of the driver core portions of the device.
430 * See the comment of the struct device_private for detail.
431 * @kobj: A top-level, abstract class from which other classes are derived.
432 * @init_name: Initial name of the device.
433 * @type: The type of device.
434 * This identifies the device type and carries type-specific
436 * @mutex: Mutex to synchronize calls to its driver.
437 * @lockdep_mutex: An optional debug lock that a subsystem can use as a
438 * peer lock to gain localized lockdep coverage of the device_lock.
439 * @bus: Type of bus device is on.
440 * @driver: Which driver has allocated this
441 * @platform_data: Platform data specific to the device.
442 * Example: For devices on custom boards, as typical of embedded
443 * and SOC based hardware, Linux often uses platform_data to point
444 * to board-specific structures describing devices and how they
445 * are wired. That can include what ports are available, chip
446 * variants, which GPIO pins act in what additional roles, and so
447 * on. This shrinks the "Board Support Packages" (BSPs) and
448 * minimizes board-specific #ifdefs in drivers.
449 * @driver_data: Private pointer for driver specific info.
450 * @links: Links to suppliers and consumers of this device.
451 * @power: For device power management.
452 * See Documentation/driver-api/pm/devices.rst for details.
453 * @pm_domain: Provide callbacks that are executed during system suspend,
454 * hibernation, system resume and during runtime PM transitions
455 * along with subsystem-level and driver-level callbacks.
456 * @pins: For device pin management.
457 * See Documentation/driver-api/pinctl.rst for details.
458 * @msi_list: Hosts MSI descriptors
459 * @msi_domain: The generic MSI domain this device is using.
460 * @numa_node: NUMA node this device is close to.
461 * @dma_ops: DMA mapping operations for this device.
462 * @dma_mask: Dma mask (if dma'ble device).
463 * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
464 * hardware supports 64-bit addresses for consistent allocations
466 * @bus_dma_limit: Limit of an upstream bridge or bus which imposes a smaller
467 * DMA limit than the device itself supports.
468 * @dma_pfn_offset: offset of DMA memory range relatively of RAM
469 * @dma_parms: A low level driver may set these to teach IOMMU code about
470 * segment limitations.
471 * @dma_pools: Dma pools (if dma'ble device).
472 * @dma_mem: Internal for coherent mem override.
473 * @cma_area: Contiguous memory area for dma allocations
474 * @archdata: For arch-specific additions.
475 * @of_node: Associated device tree node.
476 * @fwnode: Associated device node supplied by platform firmware.
477 * @devt: For creating the sysfs "dev".
478 * @id: device instance
479 * @devres_lock: Spinlock to protect the resource of the device.
480 * @devres_head: The resources list of the device.
481 * @knode_class: The node used to add the device to the class list.
482 * @class: The class of the device.
483 * @groups: Optional attribute groups.
484 * @release: Callback to free the device after all references have
485 * gone away. This should be set by the allocator of the
486 * device (i.e. the bus driver that discovered the device).
487 * @iommu_group: IOMMU group the device belongs to.
488 * @iommu: Per device generic IOMMU runtime data
490 * @offline_disabled: If set, the device is permanently online.
491 * @offline: Set after successful invocation of bus type's .offline().
492 * @of_node_reused: Set if the device-tree node is shared with an ancestor
494 * @state_synced: The hardware state of this device has been synced to match
495 * the software state of this device by calling the driver/bus
496 * sync_state() callback.
497 * @dma_coherent: this particular device is dma coherent, even if the
498 * architecture supports non-coherent devices.
500 * At the lowest level, every device in a Linux system is represented by an
501 * instance of struct device. The device structure contains the information
502 * that the device model core needs to model the system. Most subsystems,
503 * however, track additional information about the devices they host. As a
504 * result, it is rare for devices to be represented by bare device structures;
505 * instead, that structure, like kobject structures, is usually embedded within
506 * a higher-level representation of the device.
510 struct device *parent;
512 struct device_private *p;
514 const char *init_name; /* initial name of the device */
515 const struct device_type *type;
517 struct bus_type *bus; /* type of bus device is on */
518 struct device_driver *driver; /* which driver has allocated this
520 void *platform_data; /* Platform specific data, device
521 core doesn't touch it */
522 void *driver_data; /* Driver data, set and get with
523 dev_set_drvdata/dev_get_drvdata */
524 #ifdef CONFIG_PROVE_LOCKING
525 struct mutex lockdep_mutex;
527 struct mutex mutex; /* mutex to synchronize calls to
531 struct dev_links_info links;
532 struct dev_pm_info power;
533 struct dev_pm_domain *pm_domain;
535 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
536 struct irq_domain *msi_domain;
538 #ifdef CONFIG_PINCTRL
539 struct dev_pin_info *pins;
541 #ifdef CONFIG_GENERIC_MSI_IRQ
542 struct list_head msi_list;
545 const struct dma_map_ops *dma_ops;
546 u64 *dma_mask; /* dma mask (if dma'able device) */
547 u64 coherent_dma_mask;/* Like dma_mask, but for
548 alloc_coherent mappings as
549 not all hardware supports
550 64 bit addresses for consistent
551 allocations such descriptors. */
552 u64 bus_dma_limit; /* upstream dma constraint */
553 unsigned long dma_pfn_offset;
555 struct device_dma_parameters *dma_parms;
557 struct list_head dma_pools; /* dma pools (if dma'ble) */
559 #ifdef CONFIG_DMA_DECLARE_COHERENT
560 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
563 #ifdef CONFIG_DMA_CMA
564 struct cma *cma_area; /* contiguous memory area for dma
567 /* arch specific additions */
568 struct dev_archdata archdata;
570 struct device_node *of_node; /* associated device tree node */
571 struct fwnode_handle *fwnode; /* firmware device node */
574 int numa_node; /* NUMA node this device is close to */
576 dev_t devt; /* dev_t, creates the sysfs "dev" */
577 u32 id; /* device instance */
579 spinlock_t devres_lock;
580 struct list_head devres_head;
583 const struct attribute_group **groups; /* optional groups */
585 void (*release)(struct device *dev);
586 struct iommu_group *iommu_group;
587 struct dev_iommu *iommu;
589 bool offline_disabled:1;
591 bool of_node_reused:1;
593 #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
594 defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
595 defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
601 * struct device_link - Device link representation.
602 * @supplier: The device on the supplier end of the link.
603 * @s_node: Hook to the supplier device's list of links to consumers.
604 * @consumer: The device on the consumer end of the link.
605 * @c_node: Hook to the consumer device's list of links to suppliers.
606 * @link_dev: device used to expose link details in sysfs
607 * @status: The state of the link (with respect to the presence of drivers).
608 * @flags: Link flags.
609 * @rpm_active: Whether or not the consumer device is runtime-PM-active.
610 * @kref: Count repeated addition of the same link.
611 * @rcu_head: An RCU head to use for deferred execution of SRCU callbacks.
612 * @supplier_preactivated: Supplier has been made active before consumer probe.
615 struct device *supplier;
616 struct list_head s_node;
617 struct device *consumer;
618 struct list_head c_node;
619 struct device link_dev;
620 enum device_link_state status;
622 refcount_t rpm_active;
625 struct rcu_head rcu_head;
627 bool supplier_preactivated; /* Owned by consumer probe. */
630 static inline struct device *kobj_to_dev(struct kobject *kobj)
632 return container_of(kobj, struct device, kobj);
636 * device_iommu_mapped - Returns true when the device DMA is translated
638 * @dev: Device to perform the check on
640 static inline bool device_iommu_mapped(struct device *dev)
642 return (dev->iommu_group != NULL);
645 /* Get the wakeup routines, which depend on struct device */
646 #include <linux/pm_wakeup.h>
648 static inline const char *dev_name(const struct device *dev)
650 /* Use the init name until the kobject becomes available */
652 return dev->init_name;
654 return kobject_name(&dev->kobj);
657 __printf(2, 3) int dev_set_name(struct device *dev, const char *name, ...);
660 static inline int dev_to_node(struct device *dev)
662 return dev->numa_node;
664 static inline void set_dev_node(struct device *dev, int node)
666 dev->numa_node = node;
669 static inline int dev_to_node(struct device *dev)
673 static inline void set_dev_node(struct device *dev, int node)
678 static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
680 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
681 return dev->msi_domain;
687 static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d)
689 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
694 static inline void *dev_get_drvdata(const struct device *dev)
696 return dev->driver_data;
699 static inline void dev_set_drvdata(struct device *dev, void *data)
701 dev->driver_data = data;
704 static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
706 return dev ? dev->power.subsys_data : NULL;
709 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
711 return dev->kobj.uevent_suppress;
714 static inline void dev_set_uevent_suppress(struct device *dev, int val)
716 dev->kobj.uevent_suppress = val;
719 static inline int device_is_registered(struct device *dev)
721 return dev->kobj.state_in_sysfs;
724 static inline void device_enable_async_suspend(struct device *dev)
726 if (!dev->power.is_prepared)
727 dev->power.async_suspend = true;
730 static inline void device_disable_async_suspend(struct device *dev)
732 if (!dev->power.is_prepared)
733 dev->power.async_suspend = false;
736 static inline bool device_async_suspend_enabled(struct device *dev)
738 return !!dev->power.async_suspend;
741 static inline bool device_pm_not_required(struct device *dev)
743 return dev->power.no_pm;
746 static inline void device_set_pm_not_required(struct device *dev)
748 dev->power.no_pm = true;
751 static inline void dev_pm_syscore_device(struct device *dev, bool val)
753 #ifdef CONFIG_PM_SLEEP
754 dev->power.syscore = val;
758 static inline void dev_pm_set_driver_flags(struct device *dev, u32 flags)
760 dev->power.driver_flags = flags;
763 static inline bool dev_pm_test_driver_flags(struct device *dev, u32 flags)
765 return !!(dev->power.driver_flags & flags);
768 static inline void device_lock(struct device *dev)
770 mutex_lock(&dev->mutex);
773 static inline int device_lock_interruptible(struct device *dev)
775 return mutex_lock_interruptible(&dev->mutex);
778 static inline int device_trylock(struct device *dev)
780 return mutex_trylock(&dev->mutex);
783 static inline void device_unlock(struct device *dev)
785 mutex_unlock(&dev->mutex);
788 static inline void device_lock_assert(struct device *dev)
790 lockdep_assert_held(&dev->mutex);
793 static inline struct device_node *dev_of_node(struct device *dev)
795 if (!IS_ENABLED(CONFIG_OF) || !dev)
800 static inline bool dev_has_sync_state(struct device *dev)
804 if (dev->driver && dev->driver->sync_state)
806 if (dev->bus && dev->bus->sync_state)
812 * High level routines for use by the bus drivers
814 int __must_check device_register(struct device *dev);
815 void device_unregister(struct device *dev);
816 void device_initialize(struct device *dev);
817 int __must_check device_add(struct device *dev);
818 void device_del(struct device *dev);
819 int device_for_each_child(struct device *dev, void *data,
820 int (*fn)(struct device *dev, void *data));
821 int device_for_each_child_reverse(struct device *dev, void *data,
822 int (*fn)(struct device *dev, void *data));
823 struct device *device_find_child(struct device *dev, void *data,
824 int (*match)(struct device *dev, void *data));
825 struct device *device_find_child_by_name(struct device *parent,
827 int device_rename(struct device *dev, const char *new_name);
828 int device_move(struct device *dev, struct device *new_parent,
829 enum dpm_order dpm_order);
830 int device_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid);
831 const char *device_get_devnode(struct device *dev, umode_t *mode, kuid_t *uid,
832 kgid_t *gid, const char **tmp);
834 static inline bool device_supports_offline(struct device *dev)
836 return dev->bus && dev->bus->offline && dev->bus->online;
839 void lock_device_hotplug(void);
840 void unlock_device_hotplug(void);
841 int lock_device_hotplug_sysfs(void);
842 int device_offline(struct device *dev);
843 int device_online(struct device *dev);
844 void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
845 void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
846 void device_set_of_node_from_dev(struct device *dev, const struct device *dev2);
848 static inline int dev_num_vf(struct device *dev)
850 if (dev->bus && dev->bus->num_vf)
851 return dev->bus->num_vf(dev);
856 * Root device objects for grouping under /sys/devices
858 struct device *__root_device_register(const char *name, struct module *owner);
860 /* This is a macro to avoid include problems with THIS_MODULE */
861 #define root_device_register(name) \
862 __root_device_register(name, THIS_MODULE)
864 void root_device_unregister(struct device *root);
866 static inline void *dev_get_platdata(const struct device *dev)
868 return dev->platform_data;
872 * Manual binding of a device to driver. See drivers/base/bus.c
873 * for information on use.
875 int __must_check device_bind_driver(struct device *dev);
876 void device_release_driver(struct device *dev);
877 int __must_check device_attach(struct device *dev);
878 int __must_check driver_attach(struct device_driver *drv);
879 void device_initial_probe(struct device *dev);
880 int __must_check device_reprobe(struct device *dev);
882 bool device_is_bound(struct device *dev);
885 * Easy functions for dynamically creating devices on the fly
887 __printf(5, 6) struct device *
888 device_create(struct class *cls, struct device *parent, dev_t devt,
889 void *drvdata, const char *fmt, ...);
890 __printf(6, 7) struct device *
891 device_create_with_groups(struct class *cls, struct device *parent, dev_t devt,
892 void *drvdata, const struct attribute_group **groups,
893 const char *fmt, ...);
894 void device_destroy(struct class *cls, dev_t devt);
896 int __must_check device_add_groups(struct device *dev,
897 const struct attribute_group **groups);
898 void device_remove_groups(struct device *dev,
899 const struct attribute_group **groups);
901 static inline int __must_check device_add_group(struct device *dev,
902 const struct attribute_group *grp)
904 const struct attribute_group *groups[] = { grp, NULL };
906 return device_add_groups(dev, groups);
909 static inline void device_remove_group(struct device *dev,
910 const struct attribute_group *grp)
912 const struct attribute_group *groups[] = { grp, NULL };
914 return device_remove_groups(dev, groups);
917 int __must_check devm_device_add_groups(struct device *dev,
918 const struct attribute_group **groups);
919 void devm_device_remove_groups(struct device *dev,
920 const struct attribute_group **groups);
921 int __must_check devm_device_add_group(struct device *dev,
922 const struct attribute_group *grp);
923 void devm_device_remove_group(struct device *dev,
924 const struct attribute_group *grp);
927 * Platform "fixup" functions - allow the platform to have their say
928 * about devices and actions that the general device layer doesn't
931 /* Notify platform of device discovery */
932 extern int (*platform_notify)(struct device *dev);
934 extern int (*platform_notify_remove)(struct device *dev);
938 * get_device - atomically increment the reference count for the device.
941 struct device *get_device(struct device *dev);
942 void put_device(struct device *dev);
943 bool kill_device(struct device *dev);
945 #ifdef CONFIG_DEVTMPFS
946 int devtmpfs_mount(void);
948 static inline int devtmpfs_mount(void) { return 0; }
951 /* drivers/base/power/shutdown.c */
952 void device_shutdown(void);
954 /* debugging and troubleshooting/diagnostic helpers. */
955 const char *dev_driver_string(const struct device *dev);
957 /* Device links interface. */
958 struct device_link *device_link_add(struct device *consumer,
959 struct device *supplier, u32 flags);
960 void device_link_del(struct device_link *link);
961 void device_link_remove(void *consumer, struct device *supplier);
962 void device_links_supplier_sync_state_pause(void);
963 void device_links_supplier_sync_state_resume(void);
965 extern __printf(3, 4)
966 int dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
968 /* Create alias, so I can be autoloaded. */
969 #define MODULE_ALIAS_CHARDEV(major,minor) \
970 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
971 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
972 MODULE_ALIAS("char-major-" __stringify(major) "-*")
974 #ifdef CONFIG_SYSFS_DEPRECATED
975 extern long sysfs_deprecated;
977 #define sysfs_deprecated 0
980 #endif /* _DEVICE_H_ */