1 // SPDX-License-Identifier: GPL-2.0
3 * device.h - generic, centralized driver model
7 * Copyright (c) 2008-2009 Novell Inc.
9 * See Documentation/driver-model/ for more information.
15 #include <linux/ioport.h>
16 #include <linux/kobject.h>
17 #include <linux/klist.h>
18 #include <linux/list.h>
19 #include <linux/lockdep.h>
20 #include <linux/compiler.h>
21 #include <linux/types.h>
22 #include <linux/mutex.h>
24 #include <linux/atomic.h>
25 #include <linux/ratelimit.h>
26 #include <linux/uidgid.h>
27 #include <linux/gfp.h>
28 #include <linux/overflow.h>
29 #include <asm/device.h>
32 struct device_private;
34 struct driver_private;
37 struct subsys_private;
47 struct bus_attribute {
48 struct attribute attr;
49 ssize_t (*show)(struct bus_type *bus, char *buf);
50 ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
53 #define BUS_ATTR_RW(_name) \
54 struct bus_attribute bus_attr_##_name = __ATTR_RW(_name)
55 #define BUS_ATTR_RO(_name) \
56 struct bus_attribute bus_attr_##_name = __ATTR_RO(_name)
57 #define BUS_ATTR_WO(_name) \
58 struct bus_attribute bus_attr_##_name = __ATTR_WO(_name)
60 extern int __must_check bus_create_file(struct bus_type *,
61 struct bus_attribute *);
62 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
65 * struct bus_type - The bus type of the device
67 * @name: The name of the bus.
68 * @dev_name: Used for subsystems to enumerate devices like ("foo%u", dev->id).
69 * @dev_root: Default device to use as the parent.
70 * @bus_groups: Default attributes of the bus.
71 * @dev_groups: Default attributes of the devices on the bus.
72 * @drv_groups: Default attributes of the device drivers on the bus.
73 * @match: Called, perhaps multiple times, whenever a new device or driver
74 * is added for this bus. It should return a positive value if the
75 * given device can be handled by the given driver and zero
76 * otherwise. It may also return error code if determining that
77 * the driver supports the device is not possible. In case of
78 * -EPROBE_DEFER it will queue the device for deferred probing.
79 * @uevent: Called when a device is added, removed, or a few other things
80 * that generate uevents to add the environment variables.
81 * @probe: Called when a new device or driver add to this bus, and callback
82 * the specific driver's probe to initial the matched device.
83 * @remove: Called when a device removed from this bus.
84 * @shutdown: Called at shut-down time to quiesce the device.
86 * @online: Called to put the device back online (after offlining it).
87 * @offline: Called to put the device offline for hot-removal. May fail.
89 * @suspend: Called when a device on this bus wants to go to sleep mode.
90 * @resume: Called to bring a device on this bus out of sleep mode.
91 * @num_vf: Called to find out how many virtual functions a device on this
93 * @dma_configure: Called to setup DMA configuration on a device on
95 * @pm: Power management operations of this bus, callback the specific
96 * device driver's pm-ops.
97 * @iommu_ops: IOMMU specific operations for this bus, used to attach IOMMU
98 * driver implementations to a bus and allow the driver to do
100 * @p: The private data of the driver core, only the driver core can
102 * @lock_key: Lock class key for use by the lock validator
103 * @need_parent_lock: When probing or removing a device on this bus, the
104 * device core should lock the device's parent.
106 * A bus is a channel between the processor and one or more devices. For the
107 * purposes of the device model, all devices are connected via a bus, even if
108 * it is an internal, virtual, "platform" bus. Buses can plug into each other.
109 * A USB controller is usually a PCI device, for example. The device model
110 * represents the actual connections between buses and the devices they control.
111 * A bus is represented by the bus_type structure. It contains the name, the
112 * default attributes, the bus' methods, PM operations, and the driver core's
117 const char *dev_name;
118 struct device *dev_root;
119 const struct attribute_group **bus_groups;
120 const struct attribute_group **dev_groups;
121 const struct attribute_group **drv_groups;
123 int (*match)(struct device *dev, struct device_driver *drv);
124 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
125 int (*probe)(struct device *dev);
126 int (*remove)(struct device *dev);
127 void (*shutdown)(struct device *dev);
129 int (*online)(struct device *dev);
130 int (*offline)(struct device *dev);
132 int (*suspend)(struct device *dev, pm_message_t state);
133 int (*resume)(struct device *dev);
135 int (*num_vf)(struct device *dev);
137 int (*dma_configure)(struct device *dev);
139 const struct dev_pm_ops *pm;
141 const struct iommu_ops *iommu_ops;
143 struct subsys_private *p;
144 struct lock_class_key lock_key;
146 bool need_parent_lock;
149 extern int __must_check bus_register(struct bus_type *bus);
151 extern void bus_unregister(struct bus_type *bus);
153 extern int __must_check bus_rescan_devices(struct bus_type *bus);
155 /* iterator helpers for buses */
156 struct subsys_dev_iter {
157 struct klist_iter ki;
158 const struct device_type *type;
160 void subsys_dev_iter_init(struct subsys_dev_iter *iter,
161 struct bus_type *subsys,
162 struct device *start,
163 const struct device_type *type);
164 struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter);
165 void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
167 int device_match_of_node(struct device *dev, const void *np);
169 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
170 int (*fn)(struct device *dev, void *data));
171 struct device *bus_find_device(struct bus_type *bus, struct device *start,
173 int (*match)(struct device *dev, const void *data));
174 struct device *bus_find_device_by_name(struct bus_type *bus,
175 struct device *start,
177 struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id,
178 struct device *hint);
179 int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
180 void *data, int (*fn)(struct device_driver *, void *));
181 void bus_sort_breadthfirst(struct bus_type *bus,
182 int (*compare)(const struct device *a,
183 const struct device *b));
185 * Bus notifiers: Get notified of addition/removal of devices
186 * and binding/unbinding of drivers to devices.
187 * In the long run, it should be a replacement for the platform
190 struct notifier_block;
192 extern int bus_register_notifier(struct bus_type *bus,
193 struct notifier_block *nb);
194 extern int bus_unregister_notifier(struct bus_type *bus,
195 struct notifier_block *nb);
197 /* All 4 notifers below get called with the target struct device *
198 * as an argument. Note that those functions are likely to be called
199 * with the device lock held in the core, so be careful.
201 #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
202 #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device to be removed */
203 #define BUS_NOTIFY_REMOVED_DEVICE 0x00000003 /* device removed */
204 #define BUS_NOTIFY_BIND_DRIVER 0x00000004 /* driver about to be
206 #define BUS_NOTIFY_BOUND_DRIVER 0x00000005 /* driver bound to device */
207 #define BUS_NOTIFY_UNBIND_DRIVER 0x00000006 /* driver about to be
209 #define BUS_NOTIFY_UNBOUND_DRIVER 0x00000007 /* driver is unbound
211 #define BUS_NOTIFY_DRIVER_NOT_BOUND 0x00000008 /* driver fails to be bound */
213 extern struct kset *bus_get_kset(struct bus_type *bus);
214 extern struct klist *bus_get_device_klist(struct bus_type *bus);
217 * enum probe_type - device driver probe type to try
218 * Device drivers may opt in for special handling of their
219 * respective probe routines. This tells the core what to
222 * @PROBE_DEFAULT_STRATEGY: Used by drivers that work equally well
223 * whether probed synchronously or asynchronously.
224 * @PROBE_PREFER_ASYNCHRONOUS: Drivers for "slow" devices which
225 * probing order is not essential for booting the system may
226 * opt into executing their probes asynchronously.
227 * @PROBE_FORCE_SYNCHRONOUS: Use this to annotate drivers that need
228 * their probe routines to run synchronously with driver and
229 * device registration (with the exception of -EPROBE_DEFER
230 * handling - re-probing always ends up being done asynchronously).
232 * Note that the end goal is to switch the kernel to use asynchronous
233 * probing by default, so annotating drivers with
234 * %PROBE_PREFER_ASYNCHRONOUS is a temporary measure that allows us
235 * to speed up boot process while we are validating the rest of the
239 PROBE_DEFAULT_STRATEGY,
240 PROBE_PREFER_ASYNCHRONOUS,
241 PROBE_FORCE_SYNCHRONOUS,
245 * struct device_driver - The basic device driver structure
246 * @name: Name of the device driver.
247 * @bus: The bus which the device of this driver belongs to.
248 * @owner: The module owner.
249 * @mod_name: Used for built-in modules.
250 * @suppress_bind_attrs: Disables bind/unbind via sysfs.
251 * @probe_type: Type of the probe (synchronous or asynchronous) to use.
252 * @of_match_table: The open firmware table.
253 * @acpi_match_table: The ACPI match table.
254 * @probe: Called to query the existence of a specific device,
255 * whether this driver can work with it, and bind the driver
256 * to a specific device.
257 * @remove: Called when the device is removed from the system to
258 * unbind a device from this driver.
259 * @shutdown: Called at shut-down time to quiesce the device.
260 * @suspend: Called to put the device to sleep mode. Usually to a
262 * @resume: Called to bring a device from sleep mode.
263 * @groups: Default attributes that get created by the driver core
265 * @pm: Power management operations of the device which matched
267 * @coredump: Called when sysfs entry is written to. The device driver
268 * is expected to call the dev_coredump API resulting in a
270 * @p: Driver core's private data, no one other than the driver
271 * core can touch this.
273 * The device driver-model tracks all of the drivers known to the system.
274 * The main reason for this tracking is to enable the driver core to match
275 * up drivers with new devices. Once drivers are known objects within the
276 * system, however, a number of other things become possible. Device drivers
277 * can export information and configuration variables that are independent
278 * of any specific device.
280 struct device_driver {
282 struct bus_type *bus;
284 struct module *owner;
285 const char *mod_name; /* used for built-in modules */
287 bool suppress_bind_attrs; /* disables bind/unbind via sysfs */
288 enum probe_type probe_type;
290 const struct of_device_id *of_match_table;
291 const struct acpi_device_id *acpi_match_table;
293 int (*probe) (struct device *dev);
294 int (*remove) (struct device *dev);
295 void (*shutdown) (struct device *dev);
296 int (*suspend) (struct device *dev, pm_message_t state);
297 int (*resume) (struct device *dev);
298 const struct attribute_group **groups;
300 const struct dev_pm_ops *pm;
301 void (*coredump) (struct device *dev);
303 struct driver_private *p;
307 extern int __must_check driver_register(struct device_driver *drv);
308 extern void driver_unregister(struct device_driver *drv);
310 extern struct device_driver *driver_find(const char *name,
311 struct bus_type *bus);
312 extern int driver_probe_done(void);
313 extern void wait_for_device_probe(void);
315 /* sysfs interface for exporting driver attributes */
317 struct driver_attribute {
318 struct attribute attr;
319 ssize_t (*show)(struct device_driver *driver, char *buf);
320 ssize_t (*store)(struct device_driver *driver, const char *buf,
324 #define DRIVER_ATTR_RW(_name) \
325 struct driver_attribute driver_attr_##_name = __ATTR_RW(_name)
326 #define DRIVER_ATTR_RO(_name) \
327 struct driver_attribute driver_attr_##_name = __ATTR_RO(_name)
328 #define DRIVER_ATTR_WO(_name) \
329 struct driver_attribute driver_attr_##_name = __ATTR_WO(_name)
331 extern int __must_check driver_create_file(struct device_driver *driver,
332 const struct driver_attribute *attr);
333 extern void driver_remove_file(struct device_driver *driver,
334 const struct driver_attribute *attr);
336 extern int __must_check driver_for_each_device(struct device_driver *drv,
337 struct device *start,
339 int (*fn)(struct device *dev,
341 struct device *driver_find_device(struct device_driver *drv,
342 struct device *start, const void *data,
343 int (*match)(struct device *dev, const void *data));
345 void driver_deferred_probe_add(struct device *dev);
346 int driver_deferred_probe_check_state(struct device *dev);
347 int driver_deferred_probe_check_state_continue(struct device *dev);
350 * struct subsys_interface - interfaces to device functions
351 * @name: name of the device function
352 * @subsys: subsytem of the devices to attach to
353 * @node: the list of functions registered at the subsystem
354 * @add_dev: device hookup to device function handler
355 * @remove_dev: device hookup to device function handler
357 * Simple interfaces attached to a subsystem. Multiple interfaces can
358 * attach to a subsystem and its devices. Unlike drivers, they do not
359 * exclusively claim or control devices. Interfaces usually represent
360 * a specific functionality of a subsystem/class of devices.
362 struct subsys_interface {
364 struct bus_type *subsys;
365 struct list_head node;
366 int (*add_dev)(struct device *dev, struct subsys_interface *sif);
367 void (*remove_dev)(struct device *dev, struct subsys_interface *sif);
370 int subsys_interface_register(struct subsys_interface *sif);
371 void subsys_interface_unregister(struct subsys_interface *sif);
373 int subsys_system_register(struct bus_type *subsys,
374 const struct attribute_group **groups);
375 int subsys_virtual_register(struct bus_type *subsys,
376 const struct attribute_group **groups);
379 * struct class - device classes
380 * @name: Name of the class.
381 * @owner: The module owner.
382 * @class_groups: Default attributes of this class.
383 * @dev_groups: Default attributes of the devices that belong to the class.
384 * @dev_kobj: The kobject that represents this class and links it into the hierarchy.
385 * @dev_uevent: Called when a device is added, removed from this class, or a
386 * few other things that generate uevents to add the environment
388 * @devnode: Callback to provide the devtmpfs.
389 * @class_release: Called to release this class.
390 * @dev_release: Called to release the device.
391 * @shutdown_pre: Called at shut-down time before driver shutdown.
392 * @ns_type: Callbacks so sysfs can detemine namespaces.
393 * @namespace: Namespace of the device belongs to this class.
394 * @get_ownership: Allows class to specify uid/gid of the sysfs directories
395 * for the devices belonging to the class. Usually tied to
396 * device's namespace.
397 * @pm: The default device power management operations of this class.
398 * @p: The private data of the driver core, no one other than the
399 * driver core can touch this.
401 * A class is a higher-level view of a device that abstracts out low-level
402 * implementation details. Drivers may see a SCSI disk or an ATA disk, but,
403 * at the class level, they are all simply disks. Classes allow user space
404 * to work with devices based on what they do, rather than how they are
405 * connected or how they work.
409 struct module *owner;
411 const struct attribute_group **class_groups;
412 const struct attribute_group **dev_groups;
413 struct kobject *dev_kobj;
415 int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
416 char *(*devnode)(struct device *dev, umode_t *mode);
418 void (*class_release)(struct class *class);
419 void (*dev_release)(struct device *dev);
421 int (*shutdown_pre)(struct device *dev);
423 const struct kobj_ns_type_operations *ns_type;
424 const void *(*namespace)(struct device *dev);
426 void (*get_ownership)(struct device *dev, kuid_t *uid, kgid_t *gid);
428 const struct dev_pm_ops *pm;
430 struct subsys_private *p;
433 struct class_dev_iter {
434 struct klist_iter ki;
435 const struct device_type *type;
438 extern struct kobject *sysfs_dev_block_kobj;
439 extern struct kobject *sysfs_dev_char_kobj;
440 extern int __must_check __class_register(struct class *class,
441 struct lock_class_key *key);
442 extern void class_unregister(struct class *class);
444 /* This is a #define to keep the compiler from merging different
445 * instances of the __key variable */
446 #define class_register(class) \
448 static struct lock_class_key __key; \
449 __class_register(class, &__key); \
453 struct class_compat *class_compat_register(const char *name);
454 void class_compat_unregister(struct class_compat *cls);
455 int class_compat_create_link(struct class_compat *cls, struct device *dev,
456 struct device *device_link);
457 void class_compat_remove_link(struct class_compat *cls, struct device *dev,
458 struct device *device_link);
460 extern void class_dev_iter_init(struct class_dev_iter *iter,
462 struct device *start,
463 const struct device_type *type);
464 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
465 extern void class_dev_iter_exit(struct class_dev_iter *iter);
467 extern int class_for_each_device(struct class *class, struct device *start,
469 int (*fn)(struct device *dev, void *data));
470 extern struct device *class_find_device(struct class *class,
471 struct device *start, const void *data,
472 int (*match)(struct device *, const void *));
474 struct class_attribute {
475 struct attribute attr;
476 ssize_t (*show)(struct class *class, struct class_attribute *attr,
478 ssize_t (*store)(struct class *class, struct class_attribute *attr,
479 const char *buf, size_t count);
482 #define CLASS_ATTR_RW(_name) \
483 struct class_attribute class_attr_##_name = __ATTR_RW(_name)
484 #define CLASS_ATTR_RO(_name) \
485 struct class_attribute class_attr_##_name = __ATTR_RO(_name)
486 #define CLASS_ATTR_WO(_name) \
487 struct class_attribute class_attr_##_name = __ATTR_WO(_name)
489 extern int __must_check class_create_file_ns(struct class *class,
490 const struct class_attribute *attr,
492 extern void class_remove_file_ns(struct class *class,
493 const struct class_attribute *attr,
496 static inline int __must_check class_create_file(struct class *class,
497 const struct class_attribute *attr)
499 return class_create_file_ns(class, attr, NULL);
502 static inline void class_remove_file(struct class *class,
503 const struct class_attribute *attr)
505 return class_remove_file_ns(class, attr, NULL);
508 /* Simple class attribute that is just a static string */
509 struct class_attribute_string {
510 struct class_attribute attr;
514 /* Currently read-only only */
515 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
516 { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
517 #define CLASS_ATTR_STRING(_name, _mode, _str) \
518 struct class_attribute_string class_attr_##_name = \
519 _CLASS_ATTR_STRING(_name, _mode, _str)
521 extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
524 struct class_interface {
525 struct list_head node;
528 int (*add_dev) (struct device *, struct class_interface *);
529 void (*remove_dev) (struct device *, struct class_interface *);
532 extern int __must_check class_interface_register(struct class_interface *);
533 extern void class_interface_unregister(struct class_interface *);
535 extern struct class * __must_check __class_create(struct module *owner,
537 struct lock_class_key *key);
538 extern void class_destroy(struct class *cls);
540 /* This is a #define to keep the compiler from merging different
541 * instances of the __key variable */
542 #define class_create(owner, name) \
544 static struct lock_class_key __key; \
545 __class_create(owner, name, &__key); \
549 * The type of device, "struct device" is embedded in. A class
550 * or bus can contain devices of different types
551 * like "partitions" and "disks", "mouse" and "event".
552 * This identifies the device type and carries type-specific
553 * information, equivalent to the kobj_type of a kobject.
554 * If "name" is specified, the uevent will contain it in
555 * the DEVTYPE variable.
559 const struct attribute_group **groups;
560 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
561 char *(*devnode)(struct device *dev, umode_t *mode,
562 kuid_t *uid, kgid_t *gid);
563 void (*release)(struct device *dev);
565 const struct dev_pm_ops *pm;
568 /* interface for exporting device attributes */
569 struct device_attribute {
570 struct attribute attr;
571 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
573 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
574 const char *buf, size_t count);
577 struct dev_ext_attribute {
578 struct device_attribute attr;
582 ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
584 ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
585 const char *buf, size_t count);
586 ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
588 ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
589 const char *buf, size_t count);
590 ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
592 ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
593 const char *buf, size_t count);
595 #define DEVICE_ATTR(_name, _mode, _show, _store) \
596 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
597 #define DEVICE_ATTR_PREALLOC(_name, _mode, _show, _store) \
598 struct device_attribute dev_attr_##_name = \
599 __ATTR_PREALLOC(_name, _mode, _show, _store)
600 #define DEVICE_ATTR_RW(_name) \
601 struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
602 #define DEVICE_ATTR_RO(_name) \
603 struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
604 #define DEVICE_ATTR_WO(_name) \
605 struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
606 #define DEVICE_ULONG_ATTR(_name, _mode, _var) \
607 struct dev_ext_attribute dev_attr_##_name = \
608 { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
609 #define DEVICE_INT_ATTR(_name, _mode, _var) \
610 struct dev_ext_attribute dev_attr_##_name = \
611 { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
612 #define DEVICE_BOOL_ATTR(_name, _mode, _var) \
613 struct dev_ext_attribute dev_attr_##_name = \
614 { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
615 #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
616 struct device_attribute dev_attr_##_name = \
617 __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
619 extern int device_create_file(struct device *device,
620 const struct device_attribute *entry);
621 extern void device_remove_file(struct device *dev,
622 const struct device_attribute *attr);
623 extern bool device_remove_file_self(struct device *dev,
624 const struct device_attribute *attr);
625 extern int __must_check device_create_bin_file(struct device *dev,
626 const struct bin_attribute *attr);
627 extern void device_remove_bin_file(struct device *dev,
628 const struct bin_attribute *attr);
630 /* device resource management */
631 typedef void (*dr_release_t)(struct device *dev, void *res);
632 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
634 #ifdef CONFIG_DEBUG_DEVRES
635 extern void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
636 int nid, const char *name) __malloc;
637 #define devres_alloc(release, size, gfp) \
638 __devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release)
639 #define devres_alloc_node(release, size, gfp, nid) \
640 __devres_alloc_node(release, size, gfp, nid, #release)
642 extern void *devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
644 static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
646 return devres_alloc_node(release, size, gfp, NUMA_NO_NODE);
650 extern void devres_for_each_res(struct device *dev, dr_release_t release,
651 dr_match_t match, void *match_data,
652 void (*fn)(struct device *, void *, void *),
654 extern void devres_free(void *res);
655 extern void devres_add(struct device *dev, void *res);
656 extern void *devres_find(struct device *dev, dr_release_t release,
657 dr_match_t match, void *match_data);
658 extern void *devres_get(struct device *dev, void *new_res,
659 dr_match_t match, void *match_data);
660 extern void *devres_remove(struct device *dev, dr_release_t release,
661 dr_match_t match, void *match_data);
662 extern int devres_destroy(struct device *dev, dr_release_t release,
663 dr_match_t match, void *match_data);
664 extern int devres_release(struct device *dev, dr_release_t release,
665 dr_match_t match, void *match_data);
668 extern void * __must_check devres_open_group(struct device *dev, void *id,
670 extern void devres_close_group(struct device *dev, void *id);
671 extern void devres_remove_group(struct device *dev, void *id);
672 extern int devres_release_group(struct device *dev, void *id);
674 /* managed devm_k.alloc/kfree for device drivers */
675 extern void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
676 extern __printf(3, 0)
677 char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt,
678 va_list ap) __malloc;
679 extern __printf(3, 4)
680 char *devm_kasprintf(struct device *dev, gfp_t gfp, const char *fmt, ...) __malloc;
681 static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
683 return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
685 static inline void *devm_kmalloc_array(struct device *dev,
686 size_t n, size_t size, gfp_t flags)
690 if (unlikely(check_mul_overflow(n, size, &bytes)))
693 return devm_kmalloc(dev, bytes, flags);
695 static inline void *devm_kcalloc(struct device *dev,
696 size_t n, size_t size, gfp_t flags)
698 return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
700 extern void devm_kfree(struct device *dev, const void *p);
701 extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
702 extern const char *devm_kstrdup_const(struct device *dev,
703 const char *s, gfp_t gfp);
704 extern void *devm_kmemdup(struct device *dev, const void *src, size_t len,
707 extern unsigned long devm_get_free_pages(struct device *dev,
708 gfp_t gfp_mask, unsigned int order);
709 extern void devm_free_pages(struct device *dev, unsigned long addr);
711 void __iomem *devm_ioremap_resource(struct device *dev,
712 const struct resource *res);
714 void __iomem *devm_of_iomap(struct device *dev,
715 struct device_node *node, int index,
716 resource_size_t *size);
718 /* allows to add/remove a custom action to devres stack */
719 int devm_add_action(struct device *dev, void (*action)(void *), void *data);
720 void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
721 void devm_release_action(struct device *dev, void (*action)(void *), void *data);
723 static inline int devm_add_action_or_reset(struct device *dev,
724 void (*action)(void *), void *data)
728 ret = devm_add_action(dev, action, data);
736 * devm_alloc_percpu - Resource-managed alloc_percpu
737 * @dev: Device to allocate per-cpu memory for
738 * @type: Type to allocate per-cpu memory for
740 * Managed alloc_percpu. Per-cpu memory allocated with this function is
741 * automatically freed on driver detach.
744 * Pointer to allocated memory on success, NULL on failure.
746 #define devm_alloc_percpu(dev, type) \
747 ((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), \
750 void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,
752 void devm_free_percpu(struct device *dev, void __percpu *pdata);
754 struct device_dma_parameters {
756 * a low level driver may set these to teach IOMMU code about
759 unsigned int max_segment_size;
760 unsigned long segment_boundary_mask;
764 * struct device_connection - Device Connection Descriptor
765 * @fwnode: The device node of the connected device
766 * @endpoint: The names of the two devices connected together
767 * @id: Unique identifier for the connection
768 * @list: List head, private, for internal use only
770 * NOTE: @fwnode is not used together with @endpoint. @fwnode is used when
771 * platform firmware defines the connection. When the connection is registered
772 * with device_connection_add() @endpoint is used instead.
774 struct device_connection {
775 struct fwnode_handle *fwnode;
776 const char *endpoint[2];
778 struct list_head list;
781 void *device_connection_find_match(struct device *dev, const char *con_id,
783 void *(*match)(struct device_connection *con,
784 int ep, void *data));
786 struct device *device_connection_find(struct device *dev, const char *con_id);
788 void device_connection_add(struct device_connection *con);
789 void device_connection_remove(struct device_connection *con);
792 * device_connections_add - Add multiple device connections at once
793 * @cons: Zero terminated array of device connection descriptors
795 static inline void device_connections_add(struct device_connection *cons)
797 struct device_connection *c;
799 for (c = cons; c->endpoint[0]; c++)
800 device_connection_add(c);
804 * device_connections_remove - Remove multiple device connections at once
805 * @cons: Zero terminated array of device connection descriptors
807 static inline void device_connections_remove(struct device_connection *cons)
809 struct device_connection *c;
811 for (c = cons; c->endpoint[0]; c++)
812 device_connection_remove(c);
816 * enum device_link_state - Device link states.
817 * @DL_STATE_NONE: The presence of the drivers is not being tracked.
818 * @DL_STATE_DORMANT: None of the supplier/consumer drivers is present.
819 * @DL_STATE_AVAILABLE: The supplier driver is present, but the consumer is not.
820 * @DL_STATE_CONSUMER_PROBE: The consumer is probing (supplier driver present).
821 * @DL_STATE_ACTIVE: Both the supplier and consumer drivers are present.
822 * @DL_STATE_SUPPLIER_UNBIND: The supplier driver is unbinding.
824 enum device_link_state {
826 DL_STATE_DORMANT = 0,
828 DL_STATE_CONSUMER_PROBE,
830 DL_STATE_SUPPLIER_UNBIND,
836 * STATELESS: The core won't track the presence of supplier/consumer drivers.
837 * AUTOREMOVE_CONSUMER: Remove the link automatically on consumer driver unbind.
838 * PM_RUNTIME: If set, the runtime PM framework will use this link.
839 * RPM_ACTIVE: Run pm_runtime_get_sync() on the supplier during link creation.
840 * AUTOREMOVE_SUPPLIER: Remove the link automatically on supplier driver unbind.
841 * AUTOPROBE_CONSUMER: Probe consumer driver automatically after supplier binds.
843 #define DL_FLAG_STATELESS BIT(0)
844 #define DL_FLAG_AUTOREMOVE_CONSUMER BIT(1)
845 #define DL_FLAG_PM_RUNTIME BIT(2)
846 #define DL_FLAG_RPM_ACTIVE BIT(3)
847 #define DL_FLAG_AUTOREMOVE_SUPPLIER BIT(4)
848 #define DL_FLAG_AUTOPROBE_CONSUMER BIT(5)
851 * struct device_link - Device link representation.
852 * @supplier: The device on the supplier end of the link.
853 * @s_node: Hook to the supplier device's list of links to consumers.
854 * @consumer: The device on the consumer end of the link.
855 * @c_node: Hook to the consumer device's list of links to suppliers.
856 * @status: The state of the link (with respect to the presence of drivers).
857 * @flags: Link flags.
858 * @rpm_active: Whether or not the consumer device is runtime-PM-active.
859 * @kref: Count repeated addition of the same link.
860 * @rcu_head: An RCU head to use for deferred execution of SRCU callbacks.
861 * @supplier_preactivated: Supplier has been made active before consumer probe.
864 struct device *supplier;
865 struct list_head s_node;
866 struct device *consumer;
867 struct list_head c_node;
868 enum device_link_state status;
870 refcount_t rpm_active;
873 struct rcu_head rcu_head;
875 bool supplier_preactivated; /* Owned by consumer probe. */
879 * enum dl_dev_state - Device driver presence tracking information.
880 * @DL_DEV_NO_DRIVER: There is no driver attached to the device.
881 * @DL_DEV_PROBING: A driver is probing.
882 * @DL_DEV_DRIVER_BOUND: The driver has been bound to the device.
883 * @DL_DEV_UNBINDING: The driver is unbinding from the device.
886 DL_DEV_NO_DRIVER = 0,
893 * struct dev_links_info - Device data related to device links.
894 * @suppliers: List of links to supplier devices.
895 * @consumers: List of links to consumer devices.
896 * @status: Driver status information.
898 struct dev_links_info {
899 struct list_head suppliers;
900 struct list_head consumers;
901 enum dl_dev_state status;
905 * struct device - The basic device structure
906 * @parent: The device's "parent" device, the device to which it is attached.
907 * In most cases, a parent device is some sort of bus or host
908 * controller. If parent is NULL, the device, is a top-level device,
909 * which is not usually what you want.
910 * @p: Holds the private data of the driver core portions of the device.
911 * See the comment of the struct device_private for detail.
912 * @kobj: A top-level, abstract class from which other classes are derived.
913 * @init_name: Initial name of the device.
914 * @type: The type of device.
915 * This identifies the device type and carries type-specific
917 * @mutex: Mutex to synchronize calls to its driver.
918 * @bus: Type of bus device is on.
919 * @driver: Which driver has allocated this
920 * @platform_data: Platform data specific to the device.
921 * Example: For devices on custom boards, as typical of embedded
922 * and SOC based hardware, Linux often uses platform_data to point
923 * to board-specific structures describing devices and how they
924 * are wired. That can include what ports are available, chip
925 * variants, which GPIO pins act in what additional roles, and so
926 * on. This shrinks the "Board Support Packages" (BSPs) and
927 * minimizes board-specific #ifdefs in drivers.
928 * @driver_data: Private pointer for driver specific info.
929 * @links: Links to suppliers and consumers of this device.
930 * @power: For device power management.
931 * See Documentation/driver-api/pm/devices.rst for details.
932 * @pm_domain: Provide callbacks that are executed during system suspend,
933 * hibernation, system resume and during runtime PM transitions
934 * along with subsystem-level and driver-level callbacks.
935 * @pins: For device pin management.
936 * See Documentation/driver-api/pinctl.rst for details.
937 * @msi_list: Hosts MSI descriptors
938 * @msi_domain: The generic MSI domain this device is using.
939 * @numa_node: NUMA node this device is close to.
940 * @dma_ops: DMA mapping operations for this device.
941 * @dma_mask: Dma mask (if dma'ble device).
942 * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
943 * hardware supports 64-bit addresses for consistent allocations
945 * @bus_dma_mask: Mask of an upstream bridge or bus which imposes a smaller DMA
946 * limit than the device itself supports.
947 * @dma_pfn_offset: offset of DMA memory range relatively of RAM
948 * @dma_parms: A low level driver may set these to teach IOMMU code about
949 * segment limitations.
950 * @dma_pools: Dma pools (if dma'ble device).
951 * @dma_mem: Internal for coherent mem override.
952 * @cma_area: Contiguous memory area for dma allocations
953 * @archdata: For arch-specific additions.
954 * @of_node: Associated device tree node.
955 * @fwnode: Associated device node supplied by platform firmware.
956 * @devt: For creating the sysfs "dev".
957 * @id: device instance
958 * @devres_lock: Spinlock to protect the resource of the device.
959 * @devres_head: The resources list of the device.
960 * @knode_class: The node used to add the device to the class list.
961 * @class: The class of the device.
962 * @groups: Optional attribute groups.
963 * @release: Callback to free the device after all references have
964 * gone away. This should be set by the allocator of the
965 * device (i.e. the bus driver that discovered the device).
966 * @iommu_group: IOMMU group the device belongs to.
967 * @iommu_fwspec: IOMMU-specific properties supplied by firmware.
968 * @iommu_param: Per device generic IOMMU runtime data
970 * @offline_disabled: If set, the device is permanently online.
971 * @offline: Set after successful invocation of bus type's .offline().
972 * @of_node_reused: Set if the device-tree node is shared with an ancestor
974 * @dma_coherent: this particular device is dma coherent, even if the
975 * architecture supports non-coherent devices.
977 * At the lowest level, every device in a Linux system is represented by an
978 * instance of struct device. The device structure contains the information
979 * that the device model core needs to model the system. Most subsystems,
980 * however, track additional information about the devices they host. As a
981 * result, it is rare for devices to be represented by bare device structures;
982 * instead, that structure, like kobject structures, is usually embedded within
983 * a higher-level representation of the device.
987 struct device *parent;
989 struct device_private *p;
991 const char *init_name; /* initial name of the device */
992 const struct device_type *type;
994 struct bus_type *bus; /* type of bus device is on */
995 struct device_driver *driver; /* which driver has allocated this
997 void *platform_data; /* Platform specific data, device
998 core doesn't touch it */
999 void *driver_data; /* Driver data, set and get with
1000 dev_set_drvdata/dev_get_drvdata */
1001 struct mutex mutex; /* mutex to synchronize calls to
1005 struct dev_links_info links;
1006 struct dev_pm_info power;
1007 struct dev_pm_domain *pm_domain;
1009 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
1010 struct irq_domain *msi_domain;
1012 #ifdef CONFIG_PINCTRL
1013 struct dev_pin_info *pins;
1015 #ifdef CONFIG_GENERIC_MSI_IRQ
1016 struct list_head msi_list;
1019 const struct dma_map_ops *dma_ops;
1020 u64 *dma_mask; /* dma mask (if dma'able device) */
1021 u64 coherent_dma_mask;/* Like dma_mask, but for
1022 alloc_coherent mappings as
1023 not all hardware supports
1024 64 bit addresses for consistent
1025 allocations such descriptors. */
1026 u64 bus_dma_mask; /* upstream dma_mask constraint */
1027 unsigned long dma_pfn_offset;
1029 struct device_dma_parameters *dma_parms;
1031 struct list_head dma_pools; /* dma pools (if dma'ble) */
1033 #ifdef CONFIG_DMA_DECLARE_COHERENT
1034 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
1037 #ifdef CONFIG_DMA_CMA
1038 struct cma *cma_area; /* contiguous memory area for dma
1041 /* arch specific additions */
1042 struct dev_archdata archdata;
1044 struct device_node *of_node; /* associated device tree node */
1045 struct fwnode_handle *fwnode; /* firmware device node */
1048 int numa_node; /* NUMA node this device is close to */
1050 dev_t devt; /* dev_t, creates the sysfs "dev" */
1051 u32 id; /* device instance */
1053 spinlock_t devres_lock;
1054 struct list_head devres_head;
1056 struct class *class;
1057 const struct attribute_group **groups; /* optional groups */
1059 void (*release)(struct device *dev);
1060 struct iommu_group *iommu_group;
1061 struct iommu_fwspec *iommu_fwspec;
1062 struct iommu_param *iommu_param;
1064 bool offline_disabled:1;
1066 bool of_node_reused:1;
1067 #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
1068 defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
1069 defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL)
1070 bool dma_coherent:1;
1074 static inline struct device *kobj_to_dev(struct kobject *kobj)
1076 return container_of(kobj, struct device, kobj);
1080 * device_iommu_mapped - Returns true when the device DMA is translated
1082 * @dev: Device to perform the check on
1084 static inline bool device_iommu_mapped(struct device *dev)
1086 return (dev->iommu_group != NULL);
1089 /* Get the wakeup routines, which depend on struct device */
1090 #include <linux/pm_wakeup.h>
1092 static inline const char *dev_name(const struct device *dev)
1094 /* Use the init name until the kobject becomes available */
1096 return dev->init_name;
1098 return kobject_name(&dev->kobj);
1101 extern __printf(2, 3)
1102 int dev_set_name(struct device *dev, const char *name, ...);
1105 static inline int dev_to_node(struct device *dev)
1107 return dev->numa_node;
1109 static inline void set_dev_node(struct device *dev, int node)
1111 dev->numa_node = node;
1114 static inline int dev_to_node(struct device *dev)
1116 return NUMA_NO_NODE;
1118 static inline void set_dev_node(struct device *dev, int node)
1123 static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
1125 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
1126 return dev->msi_domain;
1132 static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d)
1134 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
1135 dev->msi_domain = d;
1139 static inline void *dev_get_drvdata(const struct device *dev)
1141 return dev->driver_data;
1144 static inline void dev_set_drvdata(struct device *dev, void *data)
1146 dev->driver_data = data;
1149 static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
1151 return dev ? dev->power.subsys_data : NULL;
1154 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
1156 return dev->kobj.uevent_suppress;
1159 static inline void dev_set_uevent_suppress(struct device *dev, int val)
1161 dev->kobj.uevent_suppress = val;
1164 static inline int device_is_registered(struct device *dev)
1166 return dev->kobj.state_in_sysfs;
1169 static inline void device_enable_async_suspend(struct device *dev)
1171 if (!dev->power.is_prepared)
1172 dev->power.async_suspend = true;
1175 static inline void device_disable_async_suspend(struct device *dev)
1177 if (!dev->power.is_prepared)
1178 dev->power.async_suspend = false;
1181 static inline bool device_async_suspend_enabled(struct device *dev)
1183 return !!dev->power.async_suspend;
1186 static inline bool device_pm_not_required(struct device *dev)
1188 return dev->power.no_pm;
1191 static inline void device_set_pm_not_required(struct device *dev)
1193 dev->power.no_pm = true;
1196 static inline void dev_pm_syscore_device(struct device *dev, bool val)
1198 #ifdef CONFIG_PM_SLEEP
1199 dev->power.syscore = val;
1203 static inline void dev_pm_set_driver_flags(struct device *dev, u32 flags)
1205 dev->power.driver_flags = flags;
1208 static inline bool dev_pm_test_driver_flags(struct device *dev, u32 flags)
1210 return !!(dev->power.driver_flags & flags);
1213 static inline void device_lock(struct device *dev)
1215 mutex_lock(&dev->mutex);
1218 static inline int device_lock_interruptible(struct device *dev)
1220 return mutex_lock_interruptible(&dev->mutex);
1223 static inline int device_trylock(struct device *dev)
1225 return mutex_trylock(&dev->mutex);
1228 static inline void device_unlock(struct device *dev)
1230 mutex_unlock(&dev->mutex);
1233 static inline void device_lock_assert(struct device *dev)
1235 lockdep_assert_held(&dev->mutex);
1238 static inline struct device_node *dev_of_node(struct device *dev)
1240 if (!IS_ENABLED(CONFIG_OF) || !dev)
1242 return dev->of_node;
1245 void driver_init(void);
1248 * High level routines for use by the bus drivers
1250 extern int __must_check device_register(struct device *dev);
1251 extern void device_unregister(struct device *dev);
1252 extern void device_initialize(struct device *dev);
1253 extern int __must_check device_add(struct device *dev);
1254 extern void device_del(struct device *dev);
1255 extern int device_for_each_child(struct device *dev, void *data,
1256 int (*fn)(struct device *dev, void *data));
1257 extern int device_for_each_child_reverse(struct device *dev, void *data,
1258 int (*fn)(struct device *dev, void *data));
1259 extern struct device *device_find_child(struct device *dev, void *data,
1260 int (*match)(struct device *dev, void *data));
1261 extern struct device *device_find_child_by_name(struct device *parent,
1263 extern int device_rename(struct device *dev, const char *new_name);
1264 extern int device_move(struct device *dev, struct device *new_parent,
1265 enum dpm_order dpm_order);
1266 extern const char *device_get_devnode(struct device *dev,
1267 umode_t *mode, kuid_t *uid, kgid_t *gid,
1270 static inline bool device_supports_offline(struct device *dev)
1272 return dev->bus && dev->bus->offline && dev->bus->online;
1275 extern void lock_device_hotplug(void);
1276 extern void unlock_device_hotplug(void);
1277 extern int lock_device_hotplug_sysfs(void);
1278 extern int device_offline(struct device *dev);
1279 extern int device_online(struct device *dev);
1280 extern void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
1281 extern void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
1282 void device_set_of_node_from_dev(struct device *dev, const struct device *dev2);
1284 static inline int dev_num_vf(struct device *dev)
1286 if (dev->bus && dev->bus->num_vf)
1287 return dev->bus->num_vf(dev);
1292 * Root device objects for grouping under /sys/devices
1294 extern struct device *__root_device_register(const char *name,
1295 struct module *owner);
1297 /* This is a macro to avoid include problems with THIS_MODULE */
1298 #define root_device_register(name) \
1299 __root_device_register(name, THIS_MODULE)
1301 extern void root_device_unregister(struct device *root);
1303 static inline void *dev_get_platdata(const struct device *dev)
1305 return dev->platform_data;
1309 * Manual binding of a device to driver. See drivers/base/bus.c
1310 * for information on use.
1312 extern int __must_check device_bind_driver(struct device *dev);
1313 extern void device_release_driver(struct device *dev);
1314 extern int __must_check device_attach(struct device *dev);
1315 extern int __must_check driver_attach(struct device_driver *drv);
1316 extern void device_initial_probe(struct device *dev);
1317 extern int __must_check device_reprobe(struct device *dev);
1319 extern bool device_is_bound(struct device *dev);
1322 * Easy functions for dynamically creating devices on the fly
1324 extern __printf(5, 0)
1325 struct device *device_create_vargs(struct class *cls, struct device *parent,
1326 dev_t devt, void *drvdata,
1327 const char *fmt, va_list vargs);
1328 extern __printf(5, 6)
1329 struct device *device_create(struct class *cls, struct device *parent,
1330 dev_t devt, void *drvdata,
1331 const char *fmt, ...);
1332 extern __printf(6, 7)
1333 struct device *device_create_with_groups(struct class *cls,
1334 struct device *parent, dev_t devt, void *drvdata,
1335 const struct attribute_group **groups,
1336 const char *fmt, ...);
1337 extern void device_destroy(struct class *cls, dev_t devt);
1339 extern int __must_check device_add_groups(struct device *dev,
1340 const struct attribute_group **groups);
1341 extern void device_remove_groups(struct device *dev,
1342 const struct attribute_group **groups);
1344 static inline int __must_check device_add_group(struct device *dev,
1345 const struct attribute_group *grp)
1347 const struct attribute_group *groups[] = { grp, NULL };
1349 return device_add_groups(dev, groups);
1352 static inline void device_remove_group(struct device *dev,
1353 const struct attribute_group *grp)
1355 const struct attribute_group *groups[] = { grp, NULL };
1357 return device_remove_groups(dev, groups);
1360 extern int __must_check devm_device_add_groups(struct device *dev,
1361 const struct attribute_group **groups);
1362 extern void devm_device_remove_groups(struct device *dev,
1363 const struct attribute_group **groups);
1364 extern int __must_check devm_device_add_group(struct device *dev,
1365 const struct attribute_group *grp);
1366 extern void devm_device_remove_group(struct device *dev,
1367 const struct attribute_group *grp);
1370 * Platform "fixup" functions - allow the platform to have their say
1371 * about devices and actions that the general device layer doesn't
1374 /* Notify platform of device discovery */
1375 extern int (*platform_notify)(struct device *dev);
1377 extern int (*platform_notify_remove)(struct device *dev);
1381 * get_device - atomically increment the reference count for the device.
1384 extern struct device *get_device(struct device *dev);
1385 extern void put_device(struct device *dev);
1387 #ifdef CONFIG_DEVTMPFS
1388 extern int devtmpfs_create_node(struct device *dev);
1389 extern int devtmpfs_delete_node(struct device *dev);
1390 extern int devtmpfs_mount(const char *mntdir);
1392 static inline int devtmpfs_create_node(struct device *dev) { return 0; }
1393 static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
1394 static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
1397 /* drivers/base/power/shutdown.c */
1398 extern void device_shutdown(void);
1400 /* debugging and troubleshooting/diagnostic helpers. */
1401 extern const char *dev_driver_string(const struct device *dev);
1403 /* Device links interface. */
1404 struct device_link *device_link_add(struct device *consumer,
1405 struct device *supplier, u32 flags);
1406 void device_link_del(struct device_link *link);
1407 void device_link_remove(void *consumer, struct device *supplier);
1410 #define dev_fmt(fmt) fmt
1413 #ifdef CONFIG_PRINTK
1415 __printf(3, 0) __cold
1416 int dev_vprintk_emit(int level, const struct device *dev,
1417 const char *fmt, va_list args);
1418 __printf(3, 4) __cold
1419 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...);
1421 __printf(3, 4) __cold
1422 void dev_printk(const char *level, const struct device *dev,
1423 const char *fmt, ...);
1424 __printf(2, 3) __cold
1425 void _dev_emerg(const struct device *dev, const char *fmt, ...);
1426 __printf(2, 3) __cold
1427 void _dev_alert(const struct device *dev, const char *fmt, ...);
1428 __printf(2, 3) __cold
1429 void _dev_crit(const struct device *dev, const char *fmt, ...);
1430 __printf(2, 3) __cold
1431 void _dev_err(const struct device *dev, const char *fmt, ...);
1432 __printf(2, 3) __cold
1433 void _dev_warn(const struct device *dev, const char *fmt, ...);
1434 __printf(2, 3) __cold
1435 void _dev_notice(const struct device *dev, const char *fmt, ...);
1436 __printf(2, 3) __cold
1437 void _dev_info(const struct device *dev, const char *fmt, ...);
1441 static inline __printf(3, 0)
1442 int dev_vprintk_emit(int level, const struct device *dev,
1443 const char *fmt, va_list args)
1445 static inline __printf(3, 4)
1446 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
1449 static inline void __dev_printk(const char *level, const struct device *dev,
1450 struct va_format *vaf)
1452 static inline __printf(3, 4)
1453 void dev_printk(const char *level, const struct device *dev,
1454 const char *fmt, ...)
1457 static inline __printf(2, 3)
1458 void _dev_emerg(const struct device *dev, const char *fmt, ...)
1460 static inline __printf(2, 3)
1461 void _dev_crit(const struct device *dev, const char *fmt, ...)
1463 static inline __printf(2, 3)
1464 void _dev_alert(const struct device *dev, const char *fmt, ...)
1466 static inline __printf(2, 3)
1467 void _dev_err(const struct device *dev, const char *fmt, ...)
1469 static inline __printf(2, 3)
1470 void _dev_warn(const struct device *dev, const char *fmt, ...)
1472 static inline __printf(2, 3)
1473 void _dev_notice(const struct device *dev, const char *fmt, ...)
1475 static inline __printf(2, 3)
1476 void _dev_info(const struct device *dev, const char *fmt, ...)
1482 * #defines for all the dev_<level> macros to prefix with whatever
1483 * possible use of #define dev_fmt(fmt) ...
1486 #define dev_emerg(dev, fmt, ...) \
1487 _dev_emerg(dev, dev_fmt(fmt), ##__VA_ARGS__)
1488 #define dev_crit(dev, fmt, ...) \
1489 _dev_crit(dev, dev_fmt(fmt), ##__VA_ARGS__)
1490 #define dev_alert(dev, fmt, ...) \
1491 _dev_alert(dev, dev_fmt(fmt), ##__VA_ARGS__)
1492 #define dev_err(dev, fmt, ...) \
1493 _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__)
1494 #define dev_warn(dev, fmt, ...) \
1495 _dev_warn(dev, dev_fmt(fmt), ##__VA_ARGS__)
1496 #define dev_notice(dev, fmt, ...) \
1497 _dev_notice(dev, dev_fmt(fmt), ##__VA_ARGS__)
1498 #define dev_info(dev, fmt, ...) \
1499 _dev_info(dev, dev_fmt(fmt), ##__VA_ARGS__)
1501 #if defined(CONFIG_DYNAMIC_DEBUG)
1502 #define dev_dbg(dev, fmt, ...) \
1503 dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__)
1504 #elif defined(DEBUG)
1505 #define dev_dbg(dev, fmt, ...) \
1506 dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__)
1508 #define dev_dbg(dev, fmt, ...) \
1511 dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
1515 #ifdef CONFIG_PRINTK
1516 #define dev_level_once(dev_level, dev, fmt, ...) \
1518 static bool __print_once __read_mostly; \
1520 if (!__print_once) { \
1521 __print_once = true; \
1522 dev_level(dev, fmt, ##__VA_ARGS__); \
1526 #define dev_level_once(dev_level, dev, fmt, ...) \
1529 dev_level(dev, fmt, ##__VA_ARGS__); \
1533 #define dev_emerg_once(dev, fmt, ...) \
1534 dev_level_once(dev_emerg, dev, fmt, ##__VA_ARGS__)
1535 #define dev_alert_once(dev, fmt, ...) \
1536 dev_level_once(dev_alert, dev, fmt, ##__VA_ARGS__)
1537 #define dev_crit_once(dev, fmt, ...) \
1538 dev_level_once(dev_crit, dev, fmt, ##__VA_ARGS__)
1539 #define dev_err_once(dev, fmt, ...) \
1540 dev_level_once(dev_err, dev, fmt, ##__VA_ARGS__)
1541 #define dev_warn_once(dev, fmt, ...) \
1542 dev_level_once(dev_warn, dev, fmt, ##__VA_ARGS__)
1543 #define dev_notice_once(dev, fmt, ...) \
1544 dev_level_once(dev_notice, dev, fmt, ##__VA_ARGS__)
1545 #define dev_info_once(dev, fmt, ...) \
1546 dev_level_once(dev_info, dev, fmt, ##__VA_ARGS__)
1547 #define dev_dbg_once(dev, fmt, ...) \
1548 dev_level_once(dev_dbg, dev, fmt, ##__VA_ARGS__)
1550 #define dev_level_ratelimited(dev_level, dev, fmt, ...) \
1552 static DEFINE_RATELIMIT_STATE(_rs, \
1553 DEFAULT_RATELIMIT_INTERVAL, \
1554 DEFAULT_RATELIMIT_BURST); \
1555 if (__ratelimit(&_rs)) \
1556 dev_level(dev, fmt, ##__VA_ARGS__); \
1559 #define dev_emerg_ratelimited(dev, fmt, ...) \
1560 dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__)
1561 #define dev_alert_ratelimited(dev, fmt, ...) \
1562 dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__)
1563 #define dev_crit_ratelimited(dev, fmt, ...) \
1564 dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__)
1565 #define dev_err_ratelimited(dev, fmt, ...) \
1566 dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__)
1567 #define dev_warn_ratelimited(dev, fmt, ...) \
1568 dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__)
1569 #define dev_notice_ratelimited(dev, fmt, ...) \
1570 dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
1571 #define dev_info_ratelimited(dev, fmt, ...) \
1572 dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
1573 #if defined(CONFIG_DYNAMIC_DEBUG)
1574 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
1575 #define dev_dbg_ratelimited(dev, fmt, ...) \
1577 static DEFINE_RATELIMIT_STATE(_rs, \
1578 DEFAULT_RATELIMIT_INTERVAL, \
1579 DEFAULT_RATELIMIT_BURST); \
1580 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
1581 if (DYNAMIC_DEBUG_BRANCH(descriptor) && \
1582 __ratelimit(&_rs)) \
1583 __dynamic_dev_dbg(&descriptor, dev, dev_fmt(fmt), \
1586 #elif defined(DEBUG)
1587 #define dev_dbg_ratelimited(dev, fmt, ...) \
1589 static DEFINE_RATELIMIT_STATE(_rs, \
1590 DEFAULT_RATELIMIT_INTERVAL, \
1591 DEFAULT_RATELIMIT_BURST); \
1592 if (__ratelimit(&_rs)) \
1593 dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
1596 #define dev_dbg_ratelimited(dev, fmt, ...) \
1599 dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
1603 #ifdef VERBOSE_DEBUG
1604 #define dev_vdbg dev_dbg
1606 #define dev_vdbg(dev, fmt, ...) \
1609 dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
1614 * dev_WARN*() acts like dev_printk(), but with the key difference of
1615 * using WARN/WARN_ONCE to include file/line information and a backtrace.
1617 #define dev_WARN(dev, format, arg...) \
1618 WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg);
1620 #define dev_WARN_ONCE(dev, condition, format, arg...) \
1621 WARN_ONCE(condition, "%s %s: " format, \
1622 dev_driver_string(dev), dev_name(dev), ## arg)
1624 /* Create alias, so I can be autoloaded. */
1625 #define MODULE_ALIAS_CHARDEV(major,minor) \
1626 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
1627 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
1628 MODULE_ALIAS("char-major-" __stringify(major) "-*")
1630 #ifdef CONFIG_SYSFS_DEPRECATED
1631 extern long sysfs_deprecated;
1633 #define sysfs_deprecated 0
1637 * module_driver() - Helper macro for drivers that don't do anything
1638 * special in module init/exit. This eliminates a lot of boilerplate.
1639 * Each module may only use this macro once, and calling it replaces
1640 * module_init() and module_exit().
1642 * @__driver: driver name
1643 * @__register: register function for this driver type
1644 * @__unregister: unregister function for this driver type
1645 * @...: Additional arguments to be passed to __register and __unregister.
1647 * Use this macro to construct bus specific macros for registering
1648 * drivers, and do not use it on its own.
1650 #define module_driver(__driver, __register, __unregister, ...) \
1651 static int __init __driver##_init(void) \
1653 return __register(&(__driver) , ##__VA_ARGS__); \
1655 module_init(__driver##_init); \
1656 static void __exit __driver##_exit(void) \
1658 __unregister(&(__driver) , ##__VA_ARGS__); \
1660 module_exit(__driver##_exit);
1663 * builtin_driver() - Helper macro for drivers that don't do anything
1664 * special in init and have no exit. This eliminates some boilerplate.
1665 * Each driver may only use this macro once, and calling it replaces
1666 * device_initcall (or in some cases, the legacy __initcall). This is
1667 * meant to be a direct parallel of module_driver() above but without
1668 * the __exit stuff that is not used for builtin cases.
1670 * @__driver: driver name
1671 * @__register: register function for this driver type
1672 * @...: Additional arguments to be passed to __register
1674 * Use this macro to construct bus specific macros for registering
1675 * drivers, and do not use it on its own.
1677 #define builtin_driver(__driver, __register, ...) \
1678 static int __init __driver##_init(void) \
1680 return __register(&(__driver) , ##__VA_ARGS__); \
1682 device_initcall(__driver##_init);
1684 #endif /* _DEVICE_H_ */