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 <linux/cleanup.h>
34 #include <asm/device.h>
37 struct device_private;
39 struct driver_private;
42 struct subsys_private;
49 struct msi_device_data;
52 * struct subsys_interface - interfaces to device functions
53 * @name: name of the device function
54 * @subsys: subsystem of the devices to attach to
55 * @node: the list of functions registered at the subsystem
56 * @add_dev: device hookup to device function handler
57 * @remove_dev: device hookup to device function handler
59 * Simple interfaces attached to a subsystem. Multiple interfaces can
60 * attach to a subsystem and its devices. Unlike drivers, they do not
61 * exclusively claim or control devices. Interfaces usually represent
62 * a specific functionality of a subsystem/class of devices.
64 struct subsys_interface {
66 struct bus_type *subsys;
67 struct list_head node;
68 int (*add_dev)(struct device *dev, struct subsys_interface *sif);
69 void (*remove_dev)(struct device *dev, struct subsys_interface *sif);
72 int subsys_interface_register(struct subsys_interface *sif);
73 void subsys_interface_unregister(struct subsys_interface *sif);
75 int subsys_system_register(struct bus_type *subsys,
76 const struct attribute_group **groups);
77 int subsys_virtual_register(struct bus_type *subsys,
78 const struct attribute_group **groups);
81 * The type of device, "struct device" is embedded in. A class
82 * or bus can contain devices of different types
83 * like "partitions" and "disks", "mouse" and "event".
84 * This identifies the device type and carries type-specific
85 * information, equivalent to the kobj_type of a kobject.
86 * If "name" is specified, the uevent will contain it in
87 * the DEVTYPE variable.
91 const struct attribute_group **groups;
92 int (*uevent)(const struct device *dev, struct kobj_uevent_env *env);
93 char *(*devnode)(const struct device *dev, umode_t *mode,
94 kuid_t *uid, kgid_t *gid);
95 void (*release)(struct device *dev);
97 const struct dev_pm_ops *pm;
100 /* interface for exporting device attributes */
101 struct device_attribute {
102 struct attribute attr;
103 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
105 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
106 const char *buf, size_t count);
109 struct dev_ext_attribute {
110 struct device_attribute attr;
114 ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
116 ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
117 const char *buf, size_t count);
118 ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
120 ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
121 const char *buf, size_t count);
122 ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
124 ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
125 const char *buf, size_t count);
127 #define DEVICE_ATTR(_name, _mode, _show, _store) \
128 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
129 #define DEVICE_ATTR_PREALLOC(_name, _mode, _show, _store) \
130 struct device_attribute dev_attr_##_name = \
131 __ATTR_PREALLOC(_name, _mode, _show, _store)
132 #define DEVICE_ATTR_RW(_name) \
133 struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
134 #define DEVICE_ATTR_ADMIN_RW(_name) \
135 struct device_attribute dev_attr_##_name = __ATTR_RW_MODE(_name, 0600)
136 #define DEVICE_ATTR_RO(_name) \
137 struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
138 #define DEVICE_ATTR_ADMIN_RO(_name) \
139 struct device_attribute dev_attr_##_name = __ATTR_RO_MODE(_name, 0400)
140 #define DEVICE_ATTR_WO(_name) \
141 struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
142 #define DEVICE_ULONG_ATTR(_name, _mode, _var) \
143 struct dev_ext_attribute dev_attr_##_name = \
144 { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
145 #define DEVICE_INT_ATTR(_name, _mode, _var) \
146 struct dev_ext_attribute dev_attr_##_name = \
147 { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
148 #define DEVICE_BOOL_ATTR(_name, _mode, _var) \
149 struct dev_ext_attribute dev_attr_##_name = \
150 { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
151 #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
152 struct device_attribute dev_attr_##_name = \
153 __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
155 int device_create_file(struct device *device,
156 const struct device_attribute *entry);
157 void device_remove_file(struct device *dev,
158 const struct device_attribute *attr);
159 bool device_remove_file_self(struct device *dev,
160 const struct device_attribute *attr);
161 int __must_check device_create_bin_file(struct device *dev,
162 const struct bin_attribute *attr);
163 void device_remove_bin_file(struct device *dev,
164 const struct bin_attribute *attr);
166 /* device resource management */
167 typedef void (*dr_release_t)(struct device *dev, void *res);
168 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
170 void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
171 int nid, const char *name) __malloc;
172 #define devres_alloc(release, size, gfp) \
173 __devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release)
174 #define devres_alloc_node(release, size, gfp, nid) \
175 __devres_alloc_node(release, size, gfp, nid, #release)
177 void devres_for_each_res(struct device *dev, dr_release_t release,
178 dr_match_t match, void *match_data,
179 void (*fn)(struct device *, void *, void *),
181 void devres_free(void *res);
182 void devres_add(struct device *dev, void *res);
183 void *devres_find(struct device *dev, dr_release_t release,
184 dr_match_t match, void *match_data);
185 void *devres_get(struct device *dev, void *new_res,
186 dr_match_t match, void *match_data);
187 void *devres_remove(struct device *dev, dr_release_t release,
188 dr_match_t match, void *match_data);
189 int devres_destroy(struct device *dev, dr_release_t release,
190 dr_match_t match, void *match_data);
191 int devres_release(struct device *dev, dr_release_t release,
192 dr_match_t match, void *match_data);
195 void * __must_check devres_open_group(struct device *dev, void *id, gfp_t gfp);
196 void devres_close_group(struct device *dev, void *id);
197 void devres_remove_group(struct device *dev, void *id);
198 int devres_release_group(struct device *dev, void *id);
200 /* managed devm_k.alloc/kfree for device drivers */
201 void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __alloc_size(2);
202 void *devm_krealloc(struct device *dev, void *ptr, size_t size,
203 gfp_t gfp) __must_check __realloc_size(3);
204 __printf(3, 0) char *devm_kvasprintf(struct device *dev, gfp_t gfp,
205 const char *fmt, va_list ap) __malloc;
206 __printf(3, 4) char *devm_kasprintf(struct device *dev, gfp_t gfp,
207 const char *fmt, ...) __malloc;
208 static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
210 return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
212 static inline void *devm_kmalloc_array(struct device *dev,
213 size_t n, size_t size, gfp_t flags)
217 if (unlikely(check_mul_overflow(n, size, &bytes)))
220 return devm_kmalloc(dev, bytes, flags);
222 static inline void *devm_kcalloc(struct device *dev,
223 size_t n, size_t size, gfp_t flags)
225 return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
227 void devm_kfree(struct device *dev, const void *p);
228 char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
229 const char *devm_kstrdup_const(struct device *dev, const char *s, gfp_t gfp);
230 void *devm_kmemdup(struct device *dev, const void *src, size_t len, gfp_t gfp)
233 unsigned long devm_get_free_pages(struct device *dev,
234 gfp_t gfp_mask, unsigned int order);
235 void devm_free_pages(struct device *dev, unsigned long addr);
237 void __iomem *devm_ioremap_resource(struct device *dev,
238 const struct resource *res);
239 void __iomem *devm_ioremap_resource_wc(struct device *dev,
240 const struct resource *res);
242 void __iomem *devm_of_iomap(struct device *dev,
243 struct device_node *node, int index,
244 resource_size_t *size);
246 /* allows to add/remove a custom action to devres stack */
247 void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
248 void devm_release_action(struct device *dev, void (*action)(void *), void *data);
250 int __devm_add_action(struct device *dev, void (*action)(void *), void *data, const char *name);
251 #define devm_add_action(release, action, data) \
252 __devm_add_action(release, action, data, #action)
254 static inline int __devm_add_action_or_reset(struct device *dev, void (*action)(void *),
255 void *data, const char *name)
259 ret = __devm_add_action(dev, action, data, name);
265 #define devm_add_action_or_reset(release, action, data) \
266 __devm_add_action_or_reset(release, action, data, #action)
269 * devm_alloc_percpu - Resource-managed alloc_percpu
270 * @dev: Device to allocate per-cpu memory for
271 * @type: Type to allocate per-cpu memory for
273 * Managed alloc_percpu. Per-cpu memory allocated with this function is
274 * automatically freed on driver detach.
277 * Pointer to allocated memory on success, NULL on failure.
279 #define devm_alloc_percpu(dev, type) \
280 ((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), \
283 void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,
285 void devm_free_percpu(struct device *dev, void __percpu *pdata);
287 struct device_dma_parameters {
289 * a low level driver may set these to teach IOMMU code about
292 unsigned int max_segment_size;
293 unsigned int min_align_mask;
294 unsigned long segment_boundary_mask;
298 * enum device_link_state - Device link states.
299 * @DL_STATE_NONE: The presence of the drivers is not being tracked.
300 * @DL_STATE_DORMANT: None of the supplier/consumer drivers is present.
301 * @DL_STATE_AVAILABLE: The supplier driver is present, but the consumer is not.
302 * @DL_STATE_CONSUMER_PROBE: The consumer is probing (supplier driver present).
303 * @DL_STATE_ACTIVE: Both the supplier and consumer drivers are present.
304 * @DL_STATE_SUPPLIER_UNBIND: The supplier driver is unbinding.
306 enum device_link_state {
308 DL_STATE_DORMANT = 0,
310 DL_STATE_CONSUMER_PROBE,
312 DL_STATE_SUPPLIER_UNBIND,
318 * STATELESS: The core will not remove this link automatically.
319 * AUTOREMOVE_CONSUMER: Remove the link automatically on consumer driver unbind.
320 * PM_RUNTIME: If set, the runtime PM framework will use this link.
321 * RPM_ACTIVE: Run pm_runtime_get_sync() on the supplier during link creation.
322 * AUTOREMOVE_SUPPLIER: Remove the link automatically on supplier driver unbind.
323 * AUTOPROBE_CONSUMER: Probe consumer driver automatically after supplier binds.
324 * MANAGED: The core tracks presence of supplier/consumer drivers (internal).
325 * SYNC_STATE_ONLY: Link only affects sync_state() behavior.
326 * INFERRED: Inferred from data (eg: firmware) and not from driver actions.
328 #define DL_FLAG_STATELESS BIT(0)
329 #define DL_FLAG_AUTOREMOVE_CONSUMER BIT(1)
330 #define DL_FLAG_PM_RUNTIME BIT(2)
331 #define DL_FLAG_RPM_ACTIVE BIT(3)
332 #define DL_FLAG_AUTOREMOVE_SUPPLIER BIT(4)
333 #define DL_FLAG_AUTOPROBE_CONSUMER BIT(5)
334 #define DL_FLAG_MANAGED BIT(6)
335 #define DL_FLAG_SYNC_STATE_ONLY BIT(7)
336 #define DL_FLAG_INFERRED BIT(8)
337 #define DL_FLAG_CYCLE BIT(9)
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 * enum device_removable - Whether the device is removable. The criteria for a
355 * device to be classified as removable is determined by its subsystem or bus.
356 * @DEVICE_REMOVABLE_NOT_SUPPORTED: This attribute is not supported for this
358 * @DEVICE_REMOVABLE_UNKNOWN: Device location is Unknown.
359 * @DEVICE_FIXED: Device is not removable by the user.
360 * @DEVICE_REMOVABLE: Device is removable by the user.
362 enum device_removable {
363 DEVICE_REMOVABLE_NOT_SUPPORTED = 0, /* must be 0 */
364 DEVICE_REMOVABLE_UNKNOWN,
370 * struct dev_links_info - Device data related to device links.
371 * @suppliers: List of links to supplier devices.
372 * @consumers: List of links to consumer devices.
373 * @defer_sync: Hook to global list of devices that have deferred sync_state.
374 * @status: Driver status information.
376 struct dev_links_info {
377 struct list_head suppliers;
378 struct list_head consumers;
379 struct list_head defer_sync;
380 enum dl_dev_state status;
384 * struct dev_msi_info - Device data related to MSI
385 * @domain: The MSI interrupt domain associated to the device
386 * @data: Pointer to MSI device data
388 struct dev_msi_info {
389 #ifdef CONFIG_GENERIC_MSI_IRQ
390 struct irq_domain *domain;
391 struct msi_device_data *data;
396 * enum device_physical_location_panel - Describes which panel surface of the
397 * system's housing the device connection point resides on.
398 * @DEVICE_PANEL_TOP: Device connection point is on the top panel.
399 * @DEVICE_PANEL_BOTTOM: Device connection point is on the bottom panel.
400 * @DEVICE_PANEL_LEFT: Device connection point is on the left panel.
401 * @DEVICE_PANEL_RIGHT: Device connection point is on the right panel.
402 * @DEVICE_PANEL_FRONT: Device connection point is on the front panel.
403 * @DEVICE_PANEL_BACK: Device connection point is on the back panel.
404 * @DEVICE_PANEL_UNKNOWN: The panel with device connection point is unknown.
406 enum device_physical_location_panel {
413 DEVICE_PANEL_UNKNOWN,
417 * enum device_physical_location_vertical_position - Describes vertical
418 * position of the device connection point on the panel surface.
419 * @DEVICE_VERT_POS_UPPER: Device connection point is at upper part of panel.
420 * @DEVICE_VERT_POS_CENTER: Device connection point is at center part of panel.
421 * @DEVICE_VERT_POS_LOWER: Device connection point is at lower part of panel.
423 enum device_physical_location_vertical_position {
424 DEVICE_VERT_POS_UPPER,
425 DEVICE_VERT_POS_CENTER,
426 DEVICE_VERT_POS_LOWER,
430 * enum device_physical_location_horizontal_position - Describes horizontal
431 * position of the device connection point on the panel surface.
432 * @DEVICE_HORI_POS_LEFT: Device connection point is at left part of panel.
433 * @DEVICE_HORI_POS_CENTER: Device connection point is at center part of panel.
434 * @DEVICE_HORI_POS_RIGHT: Device connection point is at right part of panel.
436 enum device_physical_location_horizontal_position {
437 DEVICE_HORI_POS_LEFT,
438 DEVICE_HORI_POS_CENTER,
439 DEVICE_HORI_POS_RIGHT,
443 * struct device_physical_location - Device data related to physical location
444 * of the device connection point.
445 * @panel: Panel surface of the system's housing that the device connection
447 * @vertical_position: Vertical position of the device connection point within
449 * @horizontal_position: Horizontal position of the device connection point
451 * @dock: Set if the device connection point resides in a docking station or
453 * @lid: Set if this device connection point resides on the lid of laptop
456 struct device_physical_location {
457 enum device_physical_location_panel panel;
458 enum device_physical_location_vertical_position vertical_position;
459 enum device_physical_location_horizontal_position horizontal_position;
465 * struct device - The basic device structure
466 * @parent: The device's "parent" device, the device to which it is attached.
467 * In most cases, a parent device is some sort of bus or host
468 * controller. If parent is NULL, the device, is a top-level device,
469 * which is not usually what you want.
470 * @p: Holds the private data of the driver core portions of the device.
471 * See the comment of the struct device_private for detail.
472 * @kobj: A top-level, abstract class from which other classes are derived.
473 * @init_name: Initial name of the device.
474 * @type: The type of device.
475 * This identifies the device type and carries type-specific
477 * @mutex: Mutex to synchronize calls to its driver.
478 * @bus: Type of bus device is on.
479 * @driver: Which driver has allocated this
480 * @platform_data: Platform data specific to the device.
481 * Example: For devices on custom boards, as typical of embedded
482 * and SOC based hardware, Linux often uses platform_data to point
483 * to board-specific structures describing devices and how they
484 * are wired. That can include what ports are available, chip
485 * variants, which GPIO pins act in what additional roles, and so
486 * on. This shrinks the "Board Support Packages" (BSPs) and
487 * minimizes board-specific #ifdefs in drivers.
488 * @driver_data: Private pointer for driver specific info.
489 * @links: Links to suppliers and consumers of this device.
490 * @power: For device power management.
491 * See Documentation/driver-api/pm/devices.rst for details.
492 * @pm_domain: Provide callbacks that are executed during system suspend,
493 * hibernation, system resume and during runtime PM transitions
494 * along with subsystem-level and driver-level callbacks.
495 * @em_pd: device's energy model performance domain
496 * @pins: For device pin management.
497 * See Documentation/driver-api/pin-control.rst for details.
498 * @msi: MSI related data
499 * @numa_node: NUMA node this device is close to.
500 * @dma_ops: DMA mapping operations for this device.
501 * @dma_mask: Dma mask (if dma'ble device).
502 * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
503 * hardware supports 64-bit addresses for consistent allocations
505 * @bus_dma_limit: Limit of an upstream bridge or bus which imposes a smaller
506 * DMA limit than the device itself supports.
507 * @dma_range_map: map for DMA memory ranges relative to that of RAM
508 * @dma_parms: A low level driver may set these to teach IOMMU code about
509 * segment limitations.
510 * @dma_pools: Dma pools (if dma'ble device).
511 * @dma_mem: Internal for coherent mem override.
512 * @cma_area: Contiguous memory area for dma allocations
513 * @dma_io_tlb_mem: Pointer to the swiotlb pool used. Not for driver use.
514 * @archdata: For arch-specific additions.
515 * @of_node: Associated device tree node.
516 * @fwnode: Associated device node supplied by platform firmware.
517 * @devt: For creating the sysfs "dev".
518 * @id: device instance
519 * @devres_lock: Spinlock to protect the resource of the device.
520 * @devres_head: The resources list of the device.
521 * @knode_class: The node used to add the device to the class list.
522 * @class: The class of the device.
523 * @groups: Optional attribute groups.
524 * @release: Callback to free the device after all references have
525 * gone away. This should be set by the allocator of the
526 * device (i.e. the bus driver that discovered the device).
527 * @iommu_group: IOMMU group the device belongs to.
528 * @iommu: Per device generic IOMMU runtime data
529 * @physical_location: Describes physical location of the device connection
530 * point in the system housing.
531 * @removable: Whether the device can be removed from the system. This
532 * should be set by the subsystem / bus driver that discovered
535 * @offline_disabled: If set, the device is permanently online.
536 * @offline: Set after successful invocation of bus type's .offline().
537 * @of_node_reused: Set if the device-tree node is shared with an ancestor
539 * @state_synced: The hardware state of this device has been synced to match
540 * the software state of this device by calling the driver/bus
541 * sync_state() callback.
542 * @can_match: The device has matched with a driver at least once or it is in
543 * a bus (like AMBA) which can't check for matching drivers until
544 * other devices probe successfully.
545 * @dma_coherent: this particular device is dma coherent, even if the
546 * architecture supports non-coherent devices.
547 * @dma_ops_bypass: If set to %true then the dma_ops are bypassed for the
548 * streaming DMA operations (->map_* / ->unmap_* / ->sync_*),
549 * and optionall (if the coherent mask is large enough) also
550 * for dma allocations. This flag is managed by the dma ops
551 * instance from ->dma_supported.
553 * At the lowest level, every device in a Linux system is represented by an
554 * instance of struct device. The device structure contains the information
555 * that the device model core needs to model the system. Most subsystems,
556 * however, track additional information about the devices they host. As a
557 * result, it is rare for devices to be represented by bare device structures;
558 * instead, that structure, like kobject structures, is usually embedded within
559 * a higher-level representation of the device.
563 struct device *parent;
565 struct device_private *p;
567 const char *init_name; /* initial name of the device */
568 const struct device_type *type;
570 const struct bus_type *bus; /* type of bus device is on */
571 struct device_driver *driver; /* which driver has allocated this
573 void *platform_data; /* Platform specific data, device
574 core doesn't touch it */
575 void *driver_data; /* Driver data, set and get with
576 dev_set_drvdata/dev_get_drvdata */
577 struct mutex mutex; /* mutex to synchronize calls to
581 struct dev_links_info links;
582 struct dev_pm_info power;
583 struct dev_pm_domain *pm_domain;
585 #ifdef CONFIG_ENERGY_MODEL
586 struct em_perf_domain *em_pd;
589 #ifdef CONFIG_PINCTRL
590 struct dev_pin_info *pins;
592 struct dev_msi_info msi;
593 #ifdef CONFIG_DMA_OPS
594 const struct dma_map_ops *dma_ops;
596 u64 *dma_mask; /* dma mask (if dma'able device) */
597 u64 coherent_dma_mask;/* Like dma_mask, but for
598 alloc_coherent mappings as
599 not all hardware supports
600 64 bit addresses for consistent
601 allocations such descriptors. */
602 u64 bus_dma_limit; /* upstream dma constraint */
603 const struct bus_dma_region *dma_range_map;
605 struct device_dma_parameters *dma_parms;
607 struct list_head dma_pools; /* dma pools (if dma'ble) */
609 #ifdef CONFIG_DMA_DECLARE_COHERENT
610 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
613 #ifdef CONFIG_DMA_CMA
614 struct cma *cma_area; /* contiguous memory area for dma
617 #ifdef CONFIG_SWIOTLB
618 struct io_tlb_mem *dma_io_tlb_mem;
620 /* arch specific additions */
621 struct dev_archdata archdata;
623 struct device_node *of_node; /* associated device tree node */
624 struct fwnode_handle *fwnode; /* firmware device node */
627 int numa_node; /* NUMA node this device is close to */
629 dev_t devt; /* dev_t, creates the sysfs "dev" */
630 u32 id; /* device instance */
632 spinlock_t devres_lock;
633 struct list_head devres_head;
635 const struct class *class;
636 const struct attribute_group **groups; /* optional groups */
638 void (*release)(struct device *dev);
639 struct iommu_group *iommu_group;
640 struct dev_iommu *iommu;
642 struct device_physical_location *physical_location;
644 enum device_removable removable;
646 bool offline_disabled:1;
648 bool of_node_reused:1;
651 #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
652 defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
653 defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
656 #ifdef CONFIG_DMA_OPS_BYPASS
657 bool dma_ops_bypass : 1;
662 * struct device_link - Device link representation.
663 * @supplier: The device on the supplier end of the link.
664 * @s_node: Hook to the supplier device's list of links to consumers.
665 * @consumer: The device on the consumer end of the link.
666 * @c_node: Hook to the consumer device's list of links to suppliers.
667 * @link_dev: device used to expose link details in sysfs
668 * @status: The state of the link (with respect to the presence of drivers).
669 * @flags: Link flags.
670 * @rpm_active: Whether or not the consumer device is runtime-PM-active.
671 * @kref: Count repeated addition of the same link.
672 * @rm_work: Work structure used for removing the link.
673 * @supplier_preactivated: Supplier has been made active before consumer probe.
676 struct device *supplier;
677 struct list_head s_node;
678 struct device *consumer;
679 struct list_head c_node;
680 struct device link_dev;
681 enum device_link_state status;
683 refcount_t rpm_active;
685 struct work_struct rm_work;
686 bool supplier_preactivated; /* Owned by consumer probe. */
689 #define kobj_to_dev(__kobj) container_of_const(__kobj, struct device, kobj)
692 * device_iommu_mapped - Returns true when the device DMA is translated
694 * @dev: Device to perform the check on
696 static inline bool device_iommu_mapped(struct device *dev)
698 return (dev->iommu_group != NULL);
701 /* Get the wakeup routines, which depend on struct device */
702 #include <linux/pm_wakeup.h>
704 static inline const char *dev_name(const struct device *dev)
706 /* Use the init name until the kobject becomes available */
708 return dev->init_name;
710 return kobject_name(&dev->kobj);
714 * dev_bus_name - Return a device's bus/class name, if at all possible
715 * @dev: struct device to get the bus/class name of
717 * Will return the name of the bus/class the device is attached to. If it is
718 * not attached to a bus/class, an empty string will be returned.
720 static inline const char *dev_bus_name(const struct device *dev)
722 return dev->bus ? dev->bus->name : (dev->class ? dev->class->name : "");
725 __printf(2, 3) int dev_set_name(struct device *dev, const char *name, ...);
728 static inline int dev_to_node(struct device *dev)
730 return dev->numa_node;
732 static inline void set_dev_node(struct device *dev, int node)
734 dev->numa_node = node;
737 static inline int dev_to_node(struct device *dev)
741 static inline void set_dev_node(struct device *dev, int node)
746 static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
748 #ifdef CONFIG_GENERIC_MSI_IRQ
749 return dev->msi.domain;
755 static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d)
757 #ifdef CONFIG_GENERIC_MSI_IRQ
762 static inline void *dev_get_drvdata(const struct device *dev)
764 return dev->driver_data;
767 static inline void dev_set_drvdata(struct device *dev, void *data)
769 dev->driver_data = data;
772 static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
774 return dev ? dev->power.subsys_data : NULL;
777 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
779 return dev->kobj.uevent_suppress;
782 static inline void dev_set_uevent_suppress(struct device *dev, int val)
784 dev->kobj.uevent_suppress = val;
787 static inline int device_is_registered(struct device *dev)
789 return dev->kobj.state_in_sysfs;
792 static inline void device_enable_async_suspend(struct device *dev)
794 if (!dev->power.is_prepared)
795 dev->power.async_suspend = true;
798 static inline void device_disable_async_suspend(struct device *dev)
800 if (!dev->power.is_prepared)
801 dev->power.async_suspend = false;
804 static inline bool device_async_suspend_enabled(struct device *dev)
806 return !!dev->power.async_suspend;
809 static inline bool device_pm_not_required(struct device *dev)
811 return dev->power.no_pm;
814 static inline void device_set_pm_not_required(struct device *dev)
816 dev->power.no_pm = true;
819 static inline void dev_pm_syscore_device(struct device *dev, bool val)
821 #ifdef CONFIG_PM_SLEEP
822 dev->power.syscore = val;
826 static inline void dev_pm_set_driver_flags(struct device *dev, u32 flags)
828 dev->power.driver_flags = flags;
831 static inline bool dev_pm_test_driver_flags(struct device *dev, u32 flags)
833 return !!(dev->power.driver_flags & flags);
836 static inline void device_lock(struct device *dev)
838 mutex_lock(&dev->mutex);
841 static inline int device_lock_interruptible(struct device *dev)
843 return mutex_lock_interruptible(&dev->mutex);
846 static inline int device_trylock(struct device *dev)
848 return mutex_trylock(&dev->mutex);
851 static inline void device_unlock(struct device *dev)
853 mutex_unlock(&dev->mutex);
856 static inline void device_lock_assert(struct device *dev)
858 lockdep_assert_held(&dev->mutex);
861 static inline struct device_node *dev_of_node(struct device *dev)
863 if (!IS_ENABLED(CONFIG_OF) || !dev)
868 static inline bool dev_has_sync_state(struct device *dev)
872 if (dev->driver && dev->driver->sync_state)
874 if (dev->bus && dev->bus->sync_state)
879 static inline void dev_set_removable(struct device *dev,
880 enum device_removable removable)
882 dev->removable = removable;
885 static inline bool dev_is_removable(struct device *dev)
887 return dev->removable == DEVICE_REMOVABLE;
890 static inline bool dev_removable_is_valid(struct device *dev)
892 return dev->removable != DEVICE_REMOVABLE_NOT_SUPPORTED;
896 * High level routines for use by the bus drivers
898 int __must_check device_register(struct device *dev);
899 void device_unregister(struct device *dev);
900 void device_initialize(struct device *dev);
901 int __must_check device_add(struct device *dev);
902 void device_del(struct device *dev);
904 DEFINE_FREE(device_del, struct device *, if (_T) device_del(_T))
906 int device_for_each_child(struct device *dev, void *data,
907 int (*fn)(struct device *dev, void *data));
908 int device_for_each_child_reverse(struct device *dev, void *data,
909 int (*fn)(struct device *dev, void *data));
910 struct device *device_find_child(struct device *dev, void *data,
911 int (*match)(struct device *dev, void *data));
912 struct device *device_find_child_by_name(struct device *parent,
914 struct device *device_find_any_child(struct device *parent);
916 int device_rename(struct device *dev, const char *new_name);
917 int device_move(struct device *dev, struct device *new_parent,
918 enum dpm_order dpm_order);
919 int device_change_owner(struct device *dev, kuid_t kuid, kgid_t kgid);
920 int device_is_dependent(struct device *dev, void *target);
922 static inline bool device_supports_offline(struct device *dev)
924 return dev->bus && dev->bus->offline && dev->bus->online;
927 #define __device_lock_set_class(dev, name, key) \
929 struct device *__d2 __maybe_unused = dev; \
930 lock_set_class(&__d2->mutex.dep_map, name, key, 0, _THIS_IP_); \
934 * device_lock_set_class - Specify a temporary lock class while a device
935 * is attached to a driver
936 * @dev: device to modify
937 * @key: lock class key data
939 * This must be called with the device_lock() already held, for example
940 * from driver ->probe(). Take care to only override the default
941 * lockdep_no_validate class.
943 #ifdef CONFIG_LOCKDEP
944 #define device_lock_set_class(dev, key) \
946 struct device *__d = dev; \
947 dev_WARN_ONCE(__d, !lockdep_match_class(&__d->mutex, \
948 &__lockdep_no_validate__), \
949 "overriding existing custom lock class\n"); \
950 __device_lock_set_class(__d, #key, key); \
953 #define device_lock_set_class(dev, key) __device_lock_set_class(dev, #key, key)
957 * device_lock_reset_class - Return a device to the default lockdep novalidate state
958 * @dev: device to modify
960 * This must be called with the device_lock() already held, for example
961 * from driver ->remove().
963 #define device_lock_reset_class(dev) \
965 struct device *__d __maybe_unused = dev; \
966 lock_set_novalidate_class(&__d->mutex.dep_map, "&dev->mutex", \
970 void lock_device_hotplug(void);
971 void unlock_device_hotplug(void);
972 int lock_device_hotplug_sysfs(void);
973 int device_offline(struct device *dev);
974 int device_online(struct device *dev);
975 void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
976 void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
977 void device_set_of_node_from_dev(struct device *dev, const struct device *dev2);
978 void device_set_node(struct device *dev, struct fwnode_handle *fwnode);
980 static inline int dev_num_vf(struct device *dev)
982 if (dev->bus && dev->bus->num_vf)
983 return dev->bus->num_vf(dev);
988 * Root device objects for grouping under /sys/devices
990 struct device *__root_device_register(const char *name, struct module *owner);
992 /* This is a macro to avoid include problems with THIS_MODULE */
993 #define root_device_register(name) \
994 __root_device_register(name, THIS_MODULE)
996 void root_device_unregister(struct device *root);
998 static inline void *dev_get_platdata(const struct device *dev)
1000 return dev->platform_data;
1004 * Manual binding of a device to driver. See drivers/base/bus.c
1005 * for information on use.
1007 int __must_check device_driver_attach(struct device_driver *drv,
1008 struct device *dev);
1009 int __must_check device_bind_driver(struct device *dev);
1010 void device_release_driver(struct device *dev);
1011 int __must_check device_attach(struct device *dev);
1012 int __must_check driver_attach(struct device_driver *drv);
1013 void device_initial_probe(struct device *dev);
1014 int __must_check device_reprobe(struct device *dev);
1016 bool device_is_bound(struct device *dev);
1019 * Easy functions for dynamically creating devices on the fly
1021 __printf(5, 6) struct device *
1022 device_create(const struct class *cls, struct device *parent, dev_t devt,
1023 void *drvdata, const char *fmt, ...);
1024 __printf(6, 7) struct device *
1025 device_create_with_groups(const struct class *cls, struct device *parent, dev_t devt,
1026 void *drvdata, const struct attribute_group **groups,
1027 const char *fmt, ...);
1028 void device_destroy(const struct class *cls, dev_t devt);
1030 int __must_check device_add_groups(struct device *dev,
1031 const struct attribute_group **groups);
1032 void device_remove_groups(struct device *dev,
1033 const struct attribute_group **groups);
1035 static inline int __must_check device_add_group(struct device *dev,
1036 const struct attribute_group *grp)
1038 const struct attribute_group *groups[] = { grp, NULL };
1040 return device_add_groups(dev, groups);
1043 static inline void device_remove_group(struct device *dev,
1044 const struct attribute_group *grp)
1046 const struct attribute_group *groups[] = { grp, NULL };
1048 return device_remove_groups(dev, groups);
1051 int __must_check devm_device_add_groups(struct device *dev,
1052 const struct attribute_group **groups);
1053 int __must_check devm_device_add_group(struct device *dev,
1054 const struct attribute_group *grp);
1057 * Platform "fixup" functions - allow the platform to have their say
1058 * about devices and actions that the general device layer doesn't
1061 /* Notify platform of device discovery */
1062 extern int (*platform_notify)(struct device *dev);
1064 extern int (*platform_notify_remove)(struct device *dev);
1068 * get_device - atomically increment the reference count for the device.
1071 struct device *get_device(struct device *dev);
1072 void put_device(struct device *dev);
1074 DEFINE_FREE(put_device, struct device *, if (_T) put_device(_T))
1076 bool kill_device(struct device *dev);
1078 #ifdef CONFIG_DEVTMPFS
1079 int devtmpfs_mount(void);
1081 static inline int devtmpfs_mount(void) { return 0; }
1084 /* drivers/base/power/shutdown.c */
1085 void device_shutdown(void);
1087 /* debugging and troubleshooting/diagnostic helpers. */
1088 const char *dev_driver_string(const struct device *dev);
1090 /* Device links interface. */
1091 struct device_link *device_link_add(struct device *consumer,
1092 struct device *supplier, u32 flags);
1093 void device_link_del(struct device_link *link);
1094 void device_link_remove(void *consumer, struct device *supplier);
1095 void device_links_supplier_sync_state_pause(void);
1096 void device_links_supplier_sync_state_resume(void);
1098 __printf(3, 4) int dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
1100 /* Create alias, so I can be autoloaded. */
1101 #define MODULE_ALIAS_CHARDEV(major,minor) \
1102 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
1103 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
1104 MODULE_ALIAS("char-major-" __stringify(major) "-*")
1106 #endif /* _DEVICE_H_ */