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 void *devm_krealloc(struct device *dev, void *ptr, size_t size,
210 gfp_t gfp) __must_check;
211 __printf(3, 0) char *devm_kvasprintf(struct device *dev, gfp_t gfp,
212 const char *fmt, va_list ap) __malloc;
213 __printf(3, 4) char *devm_kasprintf(struct device *dev, gfp_t gfp,
214 const char *fmt, ...) __malloc;
215 static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
217 return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
219 static inline void *devm_kmalloc_array(struct device *dev,
220 size_t n, size_t size, gfp_t flags)
224 if (unlikely(check_mul_overflow(n, size, &bytes)))
227 return devm_kmalloc(dev, bytes, flags);
229 static inline void *devm_kcalloc(struct device *dev,
230 size_t n, size_t size, gfp_t flags)
232 return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
234 void devm_kfree(struct device *dev, const void *p);
235 char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
236 const char *devm_kstrdup_const(struct device *dev, const char *s, gfp_t gfp);
237 void *devm_kmemdup(struct device *dev, const void *src, size_t len, gfp_t gfp);
239 unsigned long devm_get_free_pages(struct device *dev,
240 gfp_t gfp_mask, unsigned int order);
241 void devm_free_pages(struct device *dev, unsigned long addr);
243 void __iomem *devm_ioremap_resource(struct device *dev,
244 const struct resource *res);
245 void __iomem *devm_ioremap_resource_wc(struct device *dev,
246 const struct resource *res);
248 void __iomem *devm_of_iomap(struct device *dev,
249 struct device_node *node, int index,
250 resource_size_t *size);
252 /* allows to add/remove a custom action to devres stack */
253 int devm_add_action(struct device *dev, void (*action)(void *), void *data);
254 void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
255 void devm_release_action(struct device *dev, void (*action)(void *), void *data);
257 static inline int devm_add_action_or_reset(struct device *dev,
258 void (*action)(void *), void *data)
262 ret = devm_add_action(dev, action, data);
270 * devm_alloc_percpu - Resource-managed alloc_percpu
271 * @dev: Device to allocate per-cpu memory for
272 * @type: Type to allocate per-cpu memory for
274 * Managed alloc_percpu. Per-cpu memory allocated with this function is
275 * automatically freed on driver detach.
278 * Pointer to allocated memory on success, NULL on failure.
280 #define devm_alloc_percpu(dev, type) \
281 ((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), \
284 void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,
286 void devm_free_percpu(struct device *dev, void __percpu *pdata);
288 struct device_dma_parameters {
290 * a low level driver may set these to teach IOMMU code about
293 unsigned int max_segment_size;
294 unsigned int min_align_mask;
295 unsigned long segment_boundary_mask;
299 * enum device_link_state - Device link states.
300 * @DL_STATE_NONE: The presence of the drivers is not being tracked.
301 * @DL_STATE_DORMANT: None of the supplier/consumer drivers is present.
302 * @DL_STATE_AVAILABLE: The supplier driver is present, but the consumer is not.
303 * @DL_STATE_CONSUMER_PROBE: The consumer is probing (supplier driver present).
304 * @DL_STATE_ACTIVE: Both the supplier and consumer drivers are present.
305 * @DL_STATE_SUPPLIER_UNBIND: The supplier driver is unbinding.
307 enum device_link_state {
309 DL_STATE_DORMANT = 0,
311 DL_STATE_CONSUMER_PROBE,
313 DL_STATE_SUPPLIER_UNBIND,
319 * STATELESS: The core will not remove this link automatically.
320 * AUTOREMOVE_CONSUMER: Remove the link automatically on consumer driver unbind.
321 * PM_RUNTIME: If set, the runtime PM framework will use this link.
322 * RPM_ACTIVE: Run pm_runtime_get_sync() on the supplier during link creation.
323 * AUTOREMOVE_SUPPLIER: Remove the link automatically on supplier driver unbind.
324 * AUTOPROBE_CONSUMER: Probe consumer driver automatically after supplier binds.
325 * MANAGED: The core tracks presence of supplier/consumer drivers (internal).
326 * SYNC_STATE_ONLY: Link only affects sync_state() behavior.
327 * INFERRED: Inferred from data (eg: firmware) and not from driver actions.
329 #define DL_FLAG_STATELESS BIT(0)
330 #define DL_FLAG_AUTOREMOVE_CONSUMER BIT(1)
331 #define DL_FLAG_PM_RUNTIME BIT(2)
332 #define DL_FLAG_RPM_ACTIVE BIT(3)
333 #define DL_FLAG_AUTOREMOVE_SUPPLIER BIT(4)
334 #define DL_FLAG_AUTOPROBE_CONSUMER BIT(5)
335 #define DL_FLAG_MANAGED BIT(6)
336 #define DL_FLAG_SYNC_STATE_ONLY BIT(7)
337 #define DL_FLAG_INFERRED BIT(8)
340 * enum dl_dev_state - Device driver presence tracking information.
341 * @DL_DEV_NO_DRIVER: There is no driver attached to the device.
342 * @DL_DEV_PROBING: A driver is probing.
343 * @DL_DEV_DRIVER_BOUND: The driver has been bound to the device.
344 * @DL_DEV_UNBINDING: The driver is unbinding from the device.
347 DL_DEV_NO_DRIVER = 0,
354 * struct dev_links_info - Device data related to device links.
355 * @suppliers: List of links to supplier devices.
356 * @consumers: List of links to consumer devices.
357 * @defer_sync: Hook to global list of devices that have deferred sync_state.
358 * @status: Driver status information.
360 struct dev_links_info {
361 struct list_head suppliers;
362 struct list_head consumers;
363 struct list_head defer_sync;
364 enum dl_dev_state status;
368 * struct device - The basic device structure
369 * @parent: The device's "parent" device, the device to which it is attached.
370 * In most cases, a parent device is some sort of bus or host
371 * controller. If parent is NULL, the device, is a top-level device,
372 * which is not usually what you want.
373 * @p: Holds the private data of the driver core portions of the device.
374 * See the comment of the struct device_private for detail.
375 * @kobj: A top-level, abstract class from which other classes are derived.
376 * @init_name: Initial name of the device.
377 * @type: The type of device.
378 * This identifies the device type and carries type-specific
380 * @mutex: Mutex to synchronize calls to its driver.
381 * @lockdep_mutex: An optional debug lock that a subsystem can use as a
382 * peer lock to gain localized lockdep coverage of the device_lock.
383 * @bus: Type of bus device is on.
384 * @driver: Which driver has allocated this
385 * @platform_data: Platform data specific to the device.
386 * Example: For devices on custom boards, as typical of embedded
387 * and SOC based hardware, Linux often uses platform_data to point
388 * to board-specific structures describing devices and how they
389 * are wired. That can include what ports are available, chip
390 * variants, which GPIO pins act in what additional roles, and so
391 * on. This shrinks the "Board Support Packages" (BSPs) and
392 * minimizes board-specific #ifdefs in drivers.
393 * @driver_data: Private pointer for driver specific info.
394 * @links: Links to suppliers and consumers of this device.
395 * @power: For device power management.
396 * See Documentation/driver-api/pm/devices.rst for details.
397 * @pm_domain: Provide callbacks that are executed during system suspend,
398 * hibernation, system resume and during runtime PM transitions
399 * along with subsystem-level and driver-level callbacks.
400 * @em_pd: device's energy model performance domain
401 * @pins: For device pin management.
402 * See Documentation/driver-api/pinctl.rst for details.
403 * @msi_list: Hosts MSI descriptors
404 * @msi_domain: The generic MSI domain this device is using.
405 * @numa_node: NUMA node this device is close to.
406 * @dma_ops: DMA mapping operations for this device.
407 * @dma_mask: Dma mask (if dma'ble device).
408 * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
409 * hardware supports 64-bit addresses for consistent allocations
411 * @bus_dma_limit: Limit of an upstream bridge or bus which imposes a smaller
412 * DMA limit than the device itself supports.
413 * @dma_range_map: map for DMA memory ranges relative to that of RAM
414 * @dma_parms: A low level driver may set these to teach IOMMU code about
415 * segment limitations.
416 * @dma_pools: Dma pools (if dma'ble device).
417 * @dma_mem: Internal for coherent mem override.
418 * @cma_area: Contiguous memory area for dma allocations
419 * @archdata: For arch-specific additions.
420 * @of_node: Associated device tree node.
421 * @fwnode: Associated device node supplied by platform firmware.
422 * @devt: For creating the sysfs "dev".
423 * @id: device instance
424 * @devres_lock: Spinlock to protect the resource of the device.
425 * @devres_head: The resources list of the device.
426 * @knode_class: The node used to add the device to the class list.
427 * @class: The class of the device.
428 * @groups: Optional attribute groups.
429 * @release: Callback to free the device after all references have
430 * gone away. This should be set by the allocator of the
431 * device (i.e. the bus driver that discovered the device).
432 * @iommu_group: IOMMU group the device belongs to.
433 * @iommu: Per device generic IOMMU runtime data
435 * @offline_disabled: If set, the device is permanently online.
436 * @offline: Set after successful invocation of bus type's .offline().
437 * @of_node_reused: Set if the device-tree node is shared with an ancestor
439 * @state_synced: The hardware state of this device has been synced to match
440 * the software state of this device by calling the driver/bus
441 * sync_state() callback.
442 * @dma_coherent: this particular device is dma coherent, even if the
443 * architecture supports non-coherent devices.
444 * @dma_ops_bypass: If set to %true then the dma_ops are bypassed for the
445 * streaming DMA operations (->map_* / ->unmap_* / ->sync_*),
446 * and optionall (if the coherent mask is large enough) also
447 * for dma allocations. This flag is managed by the dma ops
448 * instance from ->dma_supported.
450 * At the lowest level, every device in a Linux system is represented by an
451 * instance of struct device. The device structure contains the information
452 * that the device model core needs to model the system. Most subsystems,
453 * however, track additional information about the devices they host. As a
454 * result, it is rare for devices to be represented by bare device structures;
455 * instead, that structure, like kobject structures, is usually embedded within
456 * a higher-level representation of the device.
460 struct device *parent;
462 struct device_private *p;
464 const char *init_name; /* initial name of the device */
465 const struct device_type *type;
467 struct bus_type *bus; /* type of bus device is on */
468 struct device_driver *driver; /* which driver has allocated this
470 void *platform_data; /* Platform specific data, device
471 core doesn't touch it */
472 void *driver_data; /* Driver data, set and get with
473 dev_set_drvdata/dev_get_drvdata */
474 #ifdef CONFIG_PROVE_LOCKING
475 struct mutex lockdep_mutex;
477 struct mutex mutex; /* mutex to synchronize calls to
481 struct dev_links_info links;
482 struct dev_pm_info power;
483 struct dev_pm_domain *pm_domain;
485 #ifdef CONFIG_ENERGY_MODEL
486 struct em_perf_domain *em_pd;
489 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
490 struct irq_domain *msi_domain;
492 #ifdef CONFIG_PINCTRL
493 struct dev_pin_info *pins;
495 #ifdef CONFIG_GENERIC_MSI_IRQ
496 struct list_head msi_list;
498 #ifdef CONFIG_DMA_OPS
499 const struct dma_map_ops *dma_ops;
501 u64 *dma_mask; /* dma mask (if dma'able device) */
502 u64 coherent_dma_mask;/* Like dma_mask, but for
503 alloc_coherent mappings as
504 not all hardware supports
505 64 bit addresses for consistent
506 allocations such descriptors. */
507 u64 bus_dma_limit; /* upstream dma constraint */
508 const struct bus_dma_region *dma_range_map;
510 struct device_dma_parameters *dma_parms;
512 struct list_head dma_pools; /* dma pools (if dma'ble) */
514 #ifdef CONFIG_DMA_DECLARE_COHERENT
515 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
518 #ifdef CONFIG_DMA_CMA
519 struct cma *cma_area; /* contiguous memory area for dma
522 /* arch specific additions */
523 struct dev_archdata archdata;
525 struct device_node *of_node; /* associated device tree node */
526 struct fwnode_handle *fwnode; /* firmware device node */
529 int numa_node; /* NUMA node this device is close to */
531 dev_t devt; /* dev_t, creates the sysfs "dev" */
532 u32 id; /* device instance */
534 spinlock_t devres_lock;
535 struct list_head devres_head;
538 const struct attribute_group **groups; /* optional groups */
540 void (*release)(struct device *dev);
541 struct iommu_group *iommu_group;
542 struct dev_iommu *iommu;
544 bool offline_disabled:1;
546 bool of_node_reused:1;
548 #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
549 defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
550 defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
553 #ifdef CONFIG_DMA_OPS_BYPASS
554 bool dma_ops_bypass : 1;
559 * struct device_link - Device link representation.
560 * @supplier: The device on the supplier end of the link.
561 * @s_node: Hook to the supplier device's list of links to consumers.
562 * @consumer: The device on the consumer end of the link.
563 * @c_node: Hook to the consumer device's list of links to suppliers.
564 * @link_dev: device used to expose link details in sysfs
565 * @status: The state of the link (with respect to the presence of drivers).
566 * @flags: Link flags.
567 * @rpm_active: Whether or not the consumer device is runtime-PM-active.
568 * @kref: Count repeated addition of the same link.
569 * @rcu_head: An RCU head to use for deferred execution of SRCU callbacks.
570 * @supplier_preactivated: Supplier has been made active before consumer probe.
573 struct device *supplier;
574 struct list_head s_node;
575 struct device *consumer;
576 struct list_head c_node;
577 struct device link_dev;
578 enum device_link_state status;
580 refcount_t rpm_active;
583 struct rcu_head rcu_head;
585 bool supplier_preactivated; /* Owned by consumer probe. */
588 static inline struct device *kobj_to_dev(struct kobject *kobj)
590 return container_of(kobj, struct device, kobj);
594 * device_iommu_mapped - Returns true when the device DMA is translated
596 * @dev: Device to perform the check on
598 static inline bool device_iommu_mapped(struct device *dev)
600 return (dev->iommu_group != NULL);
603 /* Get the wakeup routines, which depend on struct device */
604 #include <linux/pm_wakeup.h>
606 static inline const char *dev_name(const struct device *dev)
608 /* Use the init name until the kobject becomes available */
610 return dev->init_name;
612 return kobject_name(&dev->kobj);
616 * dev_bus_name - Return a device's bus/class name, if at all possible
617 * @dev: struct device to get the bus/class name of
619 * Will return the name of the bus/class the device is attached to. If it is
620 * not attached to a bus/class, an empty string will be returned.
622 static inline const char *dev_bus_name(const struct device *dev)
624 return dev->bus ? dev->bus->name : (dev->class ? dev->class->name : "");
627 __printf(2, 3) int dev_set_name(struct device *dev, const char *name, ...);
630 static inline int dev_to_node(struct device *dev)
632 return dev->numa_node;
634 static inline void set_dev_node(struct device *dev, int node)
636 dev->numa_node = node;
639 static inline int dev_to_node(struct device *dev)
643 static inline void set_dev_node(struct device *dev, int node)
648 static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
650 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
651 return dev->msi_domain;
657 static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d)
659 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
664 static inline void *dev_get_drvdata(const struct device *dev)
666 return dev->driver_data;
669 static inline void dev_set_drvdata(struct device *dev, void *data)
671 dev->driver_data = data;
674 static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
676 return dev ? dev->power.subsys_data : NULL;
679 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
681 return dev->kobj.uevent_suppress;
684 static inline void dev_set_uevent_suppress(struct device *dev, int val)
686 dev->kobj.uevent_suppress = val;
689 static inline int device_is_registered(struct device *dev)
691 return dev->kobj.state_in_sysfs;
694 static inline void device_enable_async_suspend(struct device *dev)
696 if (!dev->power.is_prepared)
697 dev->power.async_suspend = true;
700 static inline void device_disable_async_suspend(struct device *dev)
702 if (!dev->power.is_prepared)
703 dev->power.async_suspend = false;
706 static inline bool device_async_suspend_enabled(struct device *dev)
708 return !!dev->power.async_suspend;
711 static inline bool device_pm_not_required(struct device *dev)
713 return dev->power.no_pm;
716 static inline void device_set_pm_not_required(struct device *dev)
718 dev->power.no_pm = true;
721 static inline void dev_pm_syscore_device(struct device *dev, bool val)
723 #ifdef CONFIG_PM_SLEEP
724 dev->power.syscore = val;
728 static inline void dev_pm_set_driver_flags(struct device *dev, u32 flags)
730 dev->power.driver_flags = flags;
733 static inline bool dev_pm_test_driver_flags(struct device *dev, u32 flags)
735 return !!(dev->power.driver_flags & flags);
738 static inline void device_lock(struct device *dev)
740 mutex_lock(&dev->mutex);
743 static inline int device_lock_interruptible(struct device *dev)
745 return mutex_lock_interruptible(&dev->mutex);
748 static inline int device_trylock(struct device *dev)
750 return mutex_trylock(&dev->mutex);
753 static inline void device_unlock(struct device *dev)
755 mutex_unlock(&dev->mutex);
758 static inline void device_lock_assert(struct device *dev)
760 lockdep_assert_held(&dev->mutex);
763 static inline struct device_node *dev_of_node(struct device *dev)
765 if (!IS_ENABLED(CONFIG_OF) || !dev)
770 static inline bool dev_has_sync_state(struct device *dev)
774 if (dev->driver && dev->driver->sync_state)
776 if (dev->bus && dev->bus->sync_state)
782 * High level routines for use by the bus drivers
784 int __must_check device_register(struct device *dev);
785 void device_unregister(struct device *dev);
786 void device_initialize(struct device *dev);
787 int __must_check device_add(struct device *dev);
788 void device_del(struct device *dev);
789 int device_for_each_child(struct device *dev, void *data,
790 int (*fn)(struct device *dev, void *data));
791 int device_for_each_child_reverse(struct device *dev, void *data,
792 int (*fn)(struct device *dev, void *data));
793 struct device *device_find_child(struct device *dev, void *data,
794 int (*match)(struct device *dev, void *data));
795 struct device *device_find_child_by_name(struct device *parent,
797 int device_rename(struct device *dev, const char *new_name);
798 int device_move(struct device *dev, struct device *new_parent,
799 enum dpm_order dpm_order);
800 int device_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid);
801 const char *device_get_devnode(struct device *dev, umode_t *mode, kuid_t *uid,
802 kgid_t *gid, const char **tmp);
803 int device_is_dependent(struct device *dev, void *target);
805 static inline bool device_supports_offline(struct device *dev)
807 return dev->bus && dev->bus->offline && dev->bus->online;
810 void lock_device_hotplug(void);
811 void unlock_device_hotplug(void);
812 int lock_device_hotplug_sysfs(void);
813 int device_offline(struct device *dev);
814 int device_online(struct device *dev);
815 void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
816 void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
817 void device_set_of_node_from_dev(struct device *dev, const struct device *dev2);
819 static inline int dev_num_vf(struct device *dev)
821 if (dev->bus && dev->bus->num_vf)
822 return dev->bus->num_vf(dev);
827 * Root device objects for grouping under /sys/devices
829 struct device *__root_device_register(const char *name, struct module *owner);
831 /* This is a macro to avoid include problems with THIS_MODULE */
832 #define root_device_register(name) \
833 __root_device_register(name, THIS_MODULE)
835 void root_device_unregister(struct device *root);
837 static inline void *dev_get_platdata(const struct device *dev)
839 return dev->platform_data;
843 * Manual binding of a device to driver. See drivers/base/bus.c
844 * for information on use.
846 int __must_check device_bind_driver(struct device *dev);
847 void device_release_driver(struct device *dev);
848 int __must_check device_attach(struct device *dev);
849 int __must_check driver_attach(struct device_driver *drv);
850 void device_initial_probe(struct device *dev);
851 int __must_check device_reprobe(struct device *dev);
853 bool device_is_bound(struct device *dev);
856 * Easy functions for dynamically creating devices on the fly
858 __printf(5, 6) struct device *
859 device_create(struct class *cls, struct device *parent, dev_t devt,
860 void *drvdata, const char *fmt, ...);
861 __printf(6, 7) struct device *
862 device_create_with_groups(struct class *cls, struct device *parent, dev_t devt,
863 void *drvdata, const struct attribute_group **groups,
864 const char *fmt, ...);
865 void device_destroy(struct class *cls, dev_t devt);
867 int __must_check device_add_groups(struct device *dev,
868 const struct attribute_group **groups);
869 void device_remove_groups(struct device *dev,
870 const struct attribute_group **groups);
872 static inline int __must_check device_add_group(struct device *dev,
873 const struct attribute_group *grp)
875 const struct attribute_group *groups[] = { grp, NULL };
877 return device_add_groups(dev, groups);
880 static inline void device_remove_group(struct device *dev,
881 const struct attribute_group *grp)
883 const struct attribute_group *groups[] = { grp, NULL };
885 return device_remove_groups(dev, groups);
888 int __must_check devm_device_add_groups(struct device *dev,
889 const struct attribute_group **groups);
890 void devm_device_remove_groups(struct device *dev,
891 const struct attribute_group **groups);
892 int __must_check devm_device_add_group(struct device *dev,
893 const struct attribute_group *grp);
894 void devm_device_remove_group(struct device *dev,
895 const struct attribute_group *grp);
898 * Platform "fixup" functions - allow the platform to have their say
899 * about devices and actions that the general device layer doesn't
902 /* Notify platform of device discovery */
903 extern int (*platform_notify)(struct device *dev);
905 extern int (*platform_notify_remove)(struct device *dev);
909 * get_device - atomically increment the reference count for the device.
912 struct device *get_device(struct device *dev);
913 void put_device(struct device *dev);
914 bool kill_device(struct device *dev);
916 #ifdef CONFIG_DEVTMPFS
917 int devtmpfs_mount(void);
919 static inline int devtmpfs_mount(void) { return 0; }
922 /* drivers/base/power/shutdown.c */
923 void device_shutdown(void);
925 /* debugging and troubleshooting/diagnostic helpers. */
926 const char *dev_driver_string(const struct device *dev);
928 /* Device links interface. */
929 struct device_link *device_link_add(struct device *consumer,
930 struct device *supplier, u32 flags);
931 void device_link_del(struct device_link *link);
932 void device_link_remove(void *consumer, struct device *supplier);
933 void device_links_supplier_sync_state_pause(void);
934 void device_links_supplier_sync_state_resume(void);
936 extern __printf(3, 4)
937 int dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
939 /* Create alias, so I can be autoloaded. */
940 #define MODULE_ALIAS_CHARDEV(major,minor) \
941 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
942 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
943 MODULE_ALIAS("char-major-" __stringify(major) "-*")
945 #ifdef CONFIG_SYSFS_DEPRECATED
946 extern long sysfs_deprecated;
948 #define sysfs_deprecated 0
951 #endif /* _DEVICE_H_ */