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-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;
46 struct bus_attribute {
47 struct attribute attr;
48 ssize_t (*show)(struct bus_type *bus, char *buf);
49 ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
52 #define BUS_ATTR(_name, _mode, _show, _store) \
53 struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
54 #define BUS_ATTR_RW(_name) \
55 struct bus_attribute bus_attr_##_name = __ATTR_RW(_name)
56 #define BUS_ATTR_RO(_name) \
57 struct bus_attribute bus_attr_##_name = __ATTR_RO(_name)
59 extern int __must_check bus_create_file(struct bus_type *,
60 struct bus_attribute *);
61 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
64 * struct bus_type - The bus type of the device
66 * @name: The name of the bus.
67 * @dev_name: Used for subsystems to enumerate devices like ("foo%u", dev->id).
68 * @dev_root: Default device to use as the parent.
69 * @bus_groups: Default attributes of the bus.
70 * @dev_groups: Default attributes of the devices on the bus.
71 * @drv_groups: Default attributes of the device drivers on the bus.
72 * @match: Called, perhaps multiple times, whenever a new device or driver
73 * is added for this bus. It should return a positive value if the
74 * given device can be handled by the given driver and zero
75 * otherwise. It may also return error code if determining that
76 * the driver supports the device is not possible. In case of
77 * -EPROBE_DEFER it will queue the device for deferred probing.
78 * @uevent: Called when a device is added, removed, or a few other things
79 * that generate uevents to add the environment variables.
80 * @probe: Called when a new device or driver add to this bus, and callback
81 * the specific driver's probe to initial the matched device.
82 * @remove: Called when a device removed from this bus.
83 * @shutdown: Called at shut-down time to quiesce the device.
85 * @online: Called to put the device back online (after offlining it).
86 * @offline: Called to put the device offline for hot-removal. May fail.
88 * @suspend: Called when a device on this bus wants to go to sleep mode.
89 * @resume: Called to bring a device on this bus out of sleep mode.
90 * @num_vf: Called to find out how many virtual functions a device on this
92 * @dma_configure: Called to setup DMA configuration on a device on
94 * @pm: Power management operations of this bus, callback the specific
95 * device driver's pm-ops.
96 * @iommu_ops: IOMMU specific operations for this bus, used to attach IOMMU
97 * driver implementations to a bus and allow the driver to do
99 * @p: The private data of the driver core, only the driver core can
101 * @lock_key: Lock class key for use by the lock validator
102 * @need_parent_lock: When probing or removing a device on this bus, the
103 * device core should lock the device's parent.
105 * A bus is a channel between the processor and one or more devices. For the
106 * purposes of the device model, all devices are connected via a bus, even if
107 * it is an internal, virtual, "platform" bus. Buses can plug into each other.
108 * A USB controller is usually a PCI device, for example. The device model
109 * represents the actual connections between buses and the devices they control.
110 * A bus is represented by the bus_type structure. It contains the name, the
111 * default attributes, the bus' methods, PM operations, and the driver core's
116 const char *dev_name;
117 struct device *dev_root;
118 const struct attribute_group **bus_groups;
119 const struct attribute_group **dev_groups;
120 const struct attribute_group **drv_groups;
122 int (*match)(struct device *dev, struct device_driver *drv);
123 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
124 int (*probe)(struct device *dev);
125 int (*remove)(struct device *dev);
126 void (*shutdown)(struct device *dev);
128 int (*online)(struct device *dev);
129 int (*offline)(struct device *dev);
131 int (*suspend)(struct device *dev, pm_message_t state);
132 int (*resume)(struct device *dev);
134 int (*num_vf)(struct device *dev);
136 int (*dma_configure)(struct device *dev);
138 const struct dev_pm_ops *pm;
140 const struct iommu_ops *iommu_ops;
142 struct subsys_private *p;
143 struct lock_class_key lock_key;
145 bool need_parent_lock;
148 extern int __must_check bus_register(struct bus_type *bus);
150 extern void bus_unregister(struct bus_type *bus);
152 extern int __must_check bus_rescan_devices(struct bus_type *bus);
154 /* iterator helpers for buses */
155 struct subsys_dev_iter {
156 struct klist_iter ki;
157 const struct device_type *type;
159 void subsys_dev_iter_init(struct subsys_dev_iter *iter,
160 struct bus_type *subsys,
161 struct device *start,
162 const struct device_type *type);
163 struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter);
164 void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
166 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
167 int (*fn)(struct device *dev, void *data));
168 struct device *bus_find_device(struct bus_type *bus, struct device *start,
170 int (*match)(struct device *dev, void *data));
171 struct device *bus_find_device_by_name(struct bus_type *bus,
172 struct device *start,
174 struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id,
175 struct device *hint);
176 int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
177 void *data, int (*fn)(struct device_driver *, void *));
178 void bus_sort_breadthfirst(struct bus_type *bus,
179 int (*compare)(const struct device *a,
180 const struct device *b));
182 * Bus notifiers: Get notified of addition/removal of devices
183 * and binding/unbinding of drivers to devices.
184 * In the long run, it should be a replacement for the platform
187 struct notifier_block;
189 extern int bus_register_notifier(struct bus_type *bus,
190 struct notifier_block *nb);
191 extern int bus_unregister_notifier(struct bus_type *bus,
192 struct notifier_block *nb);
194 /* All 4 notifers below get called with the target struct device *
195 * as an argument. Note that those functions are likely to be called
196 * with the device lock held in the core, so be careful.
198 #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
199 #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device to be removed */
200 #define BUS_NOTIFY_REMOVED_DEVICE 0x00000003 /* device removed */
201 #define BUS_NOTIFY_BIND_DRIVER 0x00000004 /* driver about to be
203 #define BUS_NOTIFY_BOUND_DRIVER 0x00000005 /* driver bound to device */
204 #define BUS_NOTIFY_UNBIND_DRIVER 0x00000006 /* driver about to be
206 #define BUS_NOTIFY_UNBOUND_DRIVER 0x00000007 /* driver is unbound
208 #define BUS_NOTIFY_DRIVER_NOT_BOUND 0x00000008 /* driver fails to be bound */
210 extern struct kset *bus_get_kset(struct bus_type *bus);
211 extern struct klist *bus_get_device_klist(struct bus_type *bus);
214 * enum probe_type - device driver probe type to try
215 * Device drivers may opt in for special handling of their
216 * respective probe routines. This tells the core what to
219 * @PROBE_DEFAULT_STRATEGY: Used by drivers that work equally well
220 * whether probed synchronously or asynchronously.
221 * @PROBE_PREFER_ASYNCHRONOUS: Drivers for "slow" devices which
222 * probing order is not essential for booting the system may
223 * opt into executing their probes asynchronously.
224 * @PROBE_FORCE_SYNCHRONOUS: Use this to annotate drivers that need
225 * their probe routines to run synchronously with driver and
226 * device registration (with the exception of -EPROBE_DEFER
227 * handling - re-probing always ends up being done asynchronously).
229 * Note that the end goal is to switch the kernel to use asynchronous
230 * probing by default, so annotating drivers with
231 * %PROBE_PREFER_ASYNCHRONOUS is a temporary measure that allows us
232 * to speed up boot process while we are validating the rest of the
236 PROBE_DEFAULT_STRATEGY,
237 PROBE_PREFER_ASYNCHRONOUS,
238 PROBE_FORCE_SYNCHRONOUS,
242 * struct device_driver - The basic device driver structure
243 * @name: Name of the device driver.
244 * @bus: The bus which the device of this driver belongs to.
245 * @owner: The module owner.
246 * @mod_name: Used for built-in modules.
247 * @suppress_bind_attrs: Disables bind/unbind via sysfs.
248 * @probe_type: Type of the probe (synchronous or asynchronous) to use.
249 * @of_match_table: The open firmware table.
250 * @acpi_match_table: The ACPI match table.
251 * @probe: Called to query the existence of a specific device,
252 * whether this driver can work with it, and bind the driver
253 * to a specific device.
254 * @remove: Called when the device is removed from the system to
255 * unbind a device from this driver.
256 * @shutdown: Called at shut-down time to quiesce the device.
257 * @suspend: Called to put the device to sleep mode. Usually to a
259 * @resume: Called to bring a device from sleep mode.
260 * @groups: Default attributes that get created by the driver core
262 * @pm: Power management operations of the device which matched
264 * @coredump: Called when sysfs entry is written to. The device driver
265 * is expected to call the dev_coredump API resulting in a
267 * @p: Driver core's private data, no one other than the driver
268 * core can touch this.
270 * The device driver-model tracks all of the drivers known to the system.
271 * The main reason for this tracking is to enable the driver core to match
272 * up drivers with new devices. Once drivers are known objects within the
273 * system, however, a number of other things become possible. Device drivers
274 * can export information and configuration variables that are independent
275 * of any specific device.
277 struct device_driver {
279 struct bus_type *bus;
281 struct module *owner;
282 const char *mod_name; /* used for built-in modules */
284 bool suppress_bind_attrs; /* disables bind/unbind via sysfs */
285 enum probe_type probe_type;
287 const struct of_device_id *of_match_table;
288 const struct acpi_device_id *acpi_match_table;
290 int (*probe) (struct device *dev);
291 int (*remove) (struct device *dev);
292 void (*shutdown) (struct device *dev);
293 int (*suspend) (struct device *dev, pm_message_t state);
294 int (*resume) (struct device *dev);
295 const struct attribute_group **groups;
297 const struct dev_pm_ops *pm;
298 void (*coredump) (struct device *dev);
300 struct driver_private *p;
304 extern int __must_check driver_register(struct device_driver *drv);
305 extern void driver_unregister(struct device_driver *drv);
307 extern struct device_driver *driver_find(const char *name,
308 struct bus_type *bus);
309 extern int driver_probe_done(void);
310 extern void wait_for_device_probe(void);
312 /* sysfs interface for exporting driver attributes */
314 struct driver_attribute {
315 struct attribute attr;
316 ssize_t (*show)(struct device_driver *driver, char *buf);
317 ssize_t (*store)(struct device_driver *driver, const char *buf,
321 #define DRIVER_ATTR_RW(_name) \
322 struct driver_attribute driver_attr_##_name = __ATTR_RW(_name)
323 #define DRIVER_ATTR_RO(_name) \
324 struct driver_attribute driver_attr_##_name = __ATTR_RO(_name)
325 #define DRIVER_ATTR_WO(_name) \
326 struct driver_attribute driver_attr_##_name = __ATTR_WO(_name)
328 extern int __must_check driver_create_file(struct device_driver *driver,
329 const struct driver_attribute *attr);
330 extern void driver_remove_file(struct device_driver *driver,
331 const struct driver_attribute *attr);
333 extern int __must_check driver_for_each_device(struct device_driver *drv,
334 struct device *start,
336 int (*fn)(struct device *dev,
338 struct device *driver_find_device(struct device_driver *drv,
339 struct device *start, void *data,
340 int (*match)(struct device *dev, void *data));
343 * struct subsys_interface - interfaces to device functions
344 * @name: name of the device function
345 * @subsys: subsytem of the devices to attach to
346 * @node: the list of functions registered at the subsystem
347 * @add_dev: device hookup to device function handler
348 * @remove_dev: device hookup to device function handler
350 * Simple interfaces attached to a subsystem. Multiple interfaces can
351 * attach to a subsystem and its devices. Unlike drivers, they do not
352 * exclusively claim or control devices. Interfaces usually represent
353 * a specific functionality of a subsystem/class of devices.
355 struct subsys_interface {
357 struct bus_type *subsys;
358 struct list_head node;
359 int (*add_dev)(struct device *dev, struct subsys_interface *sif);
360 void (*remove_dev)(struct device *dev, struct subsys_interface *sif);
363 int subsys_interface_register(struct subsys_interface *sif);
364 void subsys_interface_unregister(struct subsys_interface *sif);
366 int subsys_system_register(struct bus_type *subsys,
367 const struct attribute_group **groups);
368 int subsys_virtual_register(struct bus_type *subsys,
369 const struct attribute_group **groups);
372 * struct class - device classes
373 * @name: Name of the class.
374 * @owner: The module owner.
375 * @class_groups: Default attributes of this class.
376 * @dev_groups: Default attributes of the devices that belong to the class.
377 * @dev_kobj: The kobject that represents this class and links it into the hierarchy.
378 * @dev_uevent: Called when a device is added, removed from this class, or a
379 * few other things that generate uevents to add the environment
381 * @devnode: Callback to provide the devtmpfs.
382 * @class_release: Called to release this class.
383 * @dev_release: Called to release the device.
384 * @shutdown_pre: Called at shut-down time before driver shutdown.
385 * @ns_type: Callbacks so sysfs can detemine namespaces.
386 * @namespace: Namespace of the device belongs to this class.
387 * @get_ownership: Allows class to specify uid/gid of the sysfs directories
388 * for the devices belonging to the class. Usually tied to
389 * device's namespace.
390 * @pm: The default device power management operations of this class.
391 * @p: The private data of the driver core, no one other than the
392 * driver core can touch this.
394 * A class is a higher-level view of a device that abstracts out low-level
395 * implementation details. Drivers may see a SCSI disk or an ATA disk, but,
396 * at the class level, they are all simply disks. Classes allow user space
397 * to work with devices based on what they do, rather than how they are
398 * connected or how they work.
402 struct module *owner;
404 const struct attribute_group **class_groups;
405 const struct attribute_group **dev_groups;
406 struct kobject *dev_kobj;
408 int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
409 char *(*devnode)(struct device *dev, umode_t *mode);
411 void (*class_release)(struct class *class);
412 void (*dev_release)(struct device *dev);
414 int (*shutdown_pre)(struct device *dev);
416 const struct kobj_ns_type_operations *ns_type;
417 const void *(*namespace)(struct device *dev);
419 void (*get_ownership)(struct device *dev, kuid_t *uid, kgid_t *gid);
421 const struct dev_pm_ops *pm;
423 struct subsys_private *p;
426 struct class_dev_iter {
427 struct klist_iter ki;
428 const struct device_type *type;
431 extern struct kobject *sysfs_dev_block_kobj;
432 extern struct kobject *sysfs_dev_char_kobj;
433 extern int __must_check __class_register(struct class *class,
434 struct lock_class_key *key);
435 extern void class_unregister(struct class *class);
437 /* This is a #define to keep the compiler from merging different
438 * instances of the __key variable */
439 #define class_register(class) \
441 static struct lock_class_key __key; \
442 __class_register(class, &__key); \
446 struct class_compat *class_compat_register(const char *name);
447 void class_compat_unregister(struct class_compat *cls);
448 int class_compat_create_link(struct class_compat *cls, struct device *dev,
449 struct device *device_link);
450 void class_compat_remove_link(struct class_compat *cls, struct device *dev,
451 struct device *device_link);
453 extern void class_dev_iter_init(struct class_dev_iter *iter,
455 struct device *start,
456 const struct device_type *type);
457 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
458 extern void class_dev_iter_exit(struct class_dev_iter *iter);
460 extern int class_for_each_device(struct class *class, struct device *start,
462 int (*fn)(struct device *dev, void *data));
463 extern struct device *class_find_device(struct class *class,
464 struct device *start, const void *data,
465 int (*match)(struct device *, const void *));
467 struct class_attribute {
468 struct attribute attr;
469 ssize_t (*show)(struct class *class, struct class_attribute *attr,
471 ssize_t (*store)(struct class *class, struct class_attribute *attr,
472 const char *buf, size_t count);
475 #define CLASS_ATTR_RW(_name) \
476 struct class_attribute class_attr_##_name = __ATTR_RW(_name)
477 #define CLASS_ATTR_RO(_name) \
478 struct class_attribute class_attr_##_name = __ATTR_RO(_name)
479 #define CLASS_ATTR_WO(_name) \
480 struct class_attribute class_attr_##_name = __ATTR_WO(_name)
482 extern int __must_check class_create_file_ns(struct class *class,
483 const struct class_attribute *attr,
485 extern void class_remove_file_ns(struct class *class,
486 const struct class_attribute *attr,
489 static inline int __must_check class_create_file(struct class *class,
490 const struct class_attribute *attr)
492 return class_create_file_ns(class, attr, NULL);
495 static inline void class_remove_file(struct class *class,
496 const struct class_attribute *attr)
498 return class_remove_file_ns(class, attr, NULL);
501 /* Simple class attribute that is just a static string */
502 struct class_attribute_string {
503 struct class_attribute attr;
507 /* Currently read-only only */
508 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
509 { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
510 #define CLASS_ATTR_STRING(_name, _mode, _str) \
511 struct class_attribute_string class_attr_##_name = \
512 _CLASS_ATTR_STRING(_name, _mode, _str)
514 extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
517 struct class_interface {
518 struct list_head node;
521 int (*add_dev) (struct device *, struct class_interface *);
522 void (*remove_dev) (struct device *, struct class_interface *);
525 extern int __must_check class_interface_register(struct class_interface *);
526 extern void class_interface_unregister(struct class_interface *);
528 extern struct class * __must_check __class_create(struct module *owner,
530 struct lock_class_key *key);
531 extern void class_destroy(struct class *cls);
533 /* This is a #define to keep the compiler from merging different
534 * instances of the __key variable */
535 #define class_create(owner, name) \
537 static struct lock_class_key __key; \
538 __class_create(owner, name, &__key); \
542 * The type of device, "struct device" is embedded in. A class
543 * or bus can contain devices of different types
544 * like "partitions" and "disks", "mouse" and "event".
545 * This identifies the device type and carries type-specific
546 * information, equivalent to the kobj_type of a kobject.
547 * If "name" is specified, the uevent will contain it in
548 * the DEVTYPE variable.
552 const struct attribute_group **groups;
553 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
554 char *(*devnode)(struct device *dev, umode_t *mode,
555 kuid_t *uid, kgid_t *gid);
556 void (*release)(struct device *dev);
558 const struct dev_pm_ops *pm;
561 /* interface for exporting device attributes */
562 struct device_attribute {
563 struct attribute attr;
564 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
566 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
567 const char *buf, size_t count);
570 struct dev_ext_attribute {
571 struct device_attribute attr;
575 ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
577 ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
578 const char *buf, size_t count);
579 ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
581 ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
582 const char *buf, size_t count);
583 ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
585 ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
586 const char *buf, size_t count);
588 #define DEVICE_ATTR(_name, _mode, _show, _store) \
589 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
590 #define DEVICE_ATTR_PREALLOC(_name, _mode, _show, _store) \
591 struct device_attribute dev_attr_##_name = \
592 __ATTR_PREALLOC(_name, _mode, _show, _store)
593 #define DEVICE_ATTR_RW(_name) \
594 struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
595 #define DEVICE_ATTR_RO(_name) \
596 struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
597 #define DEVICE_ATTR_WO(_name) \
598 struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
599 #define DEVICE_ULONG_ATTR(_name, _mode, _var) \
600 struct dev_ext_attribute dev_attr_##_name = \
601 { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
602 #define DEVICE_INT_ATTR(_name, _mode, _var) \
603 struct dev_ext_attribute dev_attr_##_name = \
604 { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
605 #define DEVICE_BOOL_ATTR(_name, _mode, _var) \
606 struct dev_ext_attribute dev_attr_##_name = \
607 { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
608 #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
609 struct device_attribute dev_attr_##_name = \
610 __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
612 extern int device_create_file(struct device *device,
613 const struct device_attribute *entry);
614 extern void device_remove_file(struct device *dev,
615 const struct device_attribute *attr);
616 extern bool device_remove_file_self(struct device *dev,
617 const struct device_attribute *attr);
618 extern int __must_check device_create_bin_file(struct device *dev,
619 const struct bin_attribute *attr);
620 extern void device_remove_bin_file(struct device *dev,
621 const struct bin_attribute *attr);
623 /* device resource management */
624 typedef void (*dr_release_t)(struct device *dev, void *res);
625 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
627 #ifdef CONFIG_DEBUG_DEVRES
628 extern void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
629 int nid, const char *name) __malloc;
630 #define devres_alloc(release, size, gfp) \
631 __devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release)
632 #define devres_alloc_node(release, size, gfp, nid) \
633 __devres_alloc_node(release, size, gfp, nid, #release)
635 extern void *devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
637 static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
639 return devres_alloc_node(release, size, gfp, NUMA_NO_NODE);
643 extern void devres_for_each_res(struct device *dev, dr_release_t release,
644 dr_match_t match, void *match_data,
645 void (*fn)(struct device *, void *, void *),
647 extern void devres_free(void *res);
648 extern void devres_add(struct device *dev, void *res);
649 extern void *devres_find(struct device *dev, dr_release_t release,
650 dr_match_t match, void *match_data);
651 extern void *devres_get(struct device *dev, void *new_res,
652 dr_match_t match, void *match_data);
653 extern void *devres_remove(struct device *dev, dr_release_t release,
654 dr_match_t match, void *match_data);
655 extern int devres_destroy(struct device *dev, dr_release_t release,
656 dr_match_t match, void *match_data);
657 extern int devres_release(struct device *dev, dr_release_t release,
658 dr_match_t match, void *match_data);
661 extern void * __must_check devres_open_group(struct device *dev, void *id,
663 extern void devres_close_group(struct device *dev, void *id);
664 extern void devres_remove_group(struct device *dev, void *id);
665 extern int devres_release_group(struct device *dev, void *id);
667 /* managed devm_k.alloc/kfree for device drivers */
668 extern void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
669 extern __printf(3, 0)
670 char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt,
671 va_list ap) __malloc;
672 extern __printf(3, 4)
673 char *devm_kasprintf(struct device *dev, gfp_t gfp, const char *fmt, ...) __malloc;
674 static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
676 return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
678 static inline void *devm_kmalloc_array(struct device *dev,
679 size_t n, size_t size, gfp_t flags)
683 if (unlikely(check_mul_overflow(n, size, &bytes)))
686 return devm_kmalloc(dev, bytes, flags);
688 static inline void *devm_kcalloc(struct device *dev,
689 size_t n, size_t size, gfp_t flags)
691 return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
693 extern void devm_kfree(struct device *dev, void *p);
694 extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
695 extern void *devm_kmemdup(struct device *dev, const void *src, size_t len,
698 extern unsigned long devm_get_free_pages(struct device *dev,
699 gfp_t gfp_mask, unsigned int order);
700 extern void devm_free_pages(struct device *dev, unsigned long addr);
702 void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);
704 /* allows to add/remove a custom action to devres stack */
705 int devm_add_action(struct device *dev, void (*action)(void *), void *data);
706 void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
708 static inline int devm_add_action_or_reset(struct device *dev,
709 void (*action)(void *), void *data)
713 ret = devm_add_action(dev, action, data);
721 * devm_alloc_percpu - Resource-managed alloc_percpu
722 * @dev: Device to allocate per-cpu memory for
723 * @type: Type to allocate per-cpu memory for
725 * Managed alloc_percpu. Per-cpu memory allocated with this function is
726 * automatically freed on driver detach.
729 * Pointer to allocated memory on success, NULL on failure.
731 #define devm_alloc_percpu(dev, type) \
732 ((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), \
735 void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,
737 void devm_free_percpu(struct device *dev, void __percpu *pdata);
739 struct device_dma_parameters {
741 * a low level driver may set these to teach IOMMU code about
744 unsigned int max_segment_size;
745 unsigned long segment_boundary_mask;
749 * struct device_connection - Device Connection Descriptor
750 * @endpoint: The names of the two devices connected together
751 * @id: Unique identifier for the connection
752 * @list: List head, private, for internal use only
754 struct device_connection {
755 const char *endpoint[2];
757 struct list_head list;
760 void *device_connection_find_match(struct device *dev, const char *con_id,
762 void *(*match)(struct device_connection *con,
763 int ep, void *data));
765 struct device *device_connection_find(struct device *dev, const char *con_id);
767 void device_connection_add(struct device_connection *con);
768 void device_connection_remove(struct device_connection *con);
771 * enum device_link_state - Device link states.
772 * @DL_STATE_NONE: The presence of the drivers is not being tracked.
773 * @DL_STATE_DORMANT: None of the supplier/consumer drivers is present.
774 * @DL_STATE_AVAILABLE: The supplier driver is present, but the consumer is not.
775 * @DL_STATE_CONSUMER_PROBE: The consumer is probing (supplier driver present).
776 * @DL_STATE_ACTIVE: Both the supplier and consumer drivers are present.
777 * @DL_STATE_SUPPLIER_UNBIND: The supplier driver is unbinding.
779 enum device_link_state {
781 DL_STATE_DORMANT = 0,
783 DL_STATE_CONSUMER_PROBE,
785 DL_STATE_SUPPLIER_UNBIND,
791 * STATELESS: The core won't track the presence of supplier/consumer drivers.
792 * AUTOREMOVE_CONSUMER: Remove the link automatically on consumer driver unbind.
793 * PM_RUNTIME: If set, the runtime PM framework will use this link.
794 * RPM_ACTIVE: Run pm_runtime_get_sync() on the supplier during link creation.
795 * AUTOREMOVE_SUPPLIER: Remove the link automatically on supplier driver unbind.
797 #define DL_FLAG_STATELESS BIT(0)
798 #define DL_FLAG_AUTOREMOVE_CONSUMER BIT(1)
799 #define DL_FLAG_PM_RUNTIME BIT(2)
800 #define DL_FLAG_RPM_ACTIVE BIT(3)
801 #define DL_FLAG_AUTOREMOVE_SUPPLIER BIT(4)
804 * struct device_link - Device link representation.
805 * @supplier: The device on the supplier end of the link.
806 * @s_node: Hook to the supplier device's list of links to consumers.
807 * @consumer: The device on the consumer end of the link.
808 * @c_node: Hook to the consumer device's list of links to suppliers.
809 * @status: The state of the link (with respect to the presence of drivers).
810 * @flags: Link flags.
811 * @rpm_active: Whether or not the consumer device is runtime-PM-active.
812 * @kref: Count repeated addition of the same link.
813 * @rcu_head: An RCU head to use for deferred execution of SRCU callbacks.
816 struct device *supplier;
817 struct list_head s_node;
818 struct device *consumer;
819 struct list_head c_node;
820 enum device_link_state status;
825 struct rcu_head rcu_head;
830 * enum dl_dev_state - Device driver presence tracking information.
831 * @DL_DEV_NO_DRIVER: There is no driver attached to the device.
832 * @DL_DEV_PROBING: A driver is probing.
833 * @DL_DEV_DRIVER_BOUND: The driver has been bound to the device.
834 * @DL_DEV_UNBINDING: The driver is unbinding from the device.
837 DL_DEV_NO_DRIVER = 0,
844 * struct dev_links_info - Device data related to device links.
845 * @suppliers: List of links to supplier devices.
846 * @consumers: List of links to consumer devices.
847 * @status: Driver status information.
849 struct dev_links_info {
850 struct list_head suppliers;
851 struct list_head consumers;
852 enum dl_dev_state status;
856 * struct device - The basic device structure
857 * @parent: The device's "parent" device, the device to which it is attached.
858 * In most cases, a parent device is some sort of bus or host
859 * controller. If parent is NULL, the device, is a top-level device,
860 * which is not usually what you want.
861 * @p: Holds the private data of the driver core portions of the device.
862 * See the comment of the struct device_private for detail.
863 * @kobj: A top-level, abstract class from which other classes are derived.
864 * @init_name: Initial name of the device.
865 * @type: The type of device.
866 * This identifies the device type and carries type-specific
868 * @mutex: Mutex to synchronize calls to its driver.
869 * @bus: Type of bus device is on.
870 * @driver: Which driver has allocated this
871 * @platform_data: Platform data specific to the device.
872 * Example: For devices on custom boards, as typical of embedded
873 * and SOC based hardware, Linux often uses platform_data to point
874 * to board-specific structures describing devices and how they
875 * are wired. That can include what ports are available, chip
876 * variants, which GPIO pins act in what additional roles, and so
877 * on. This shrinks the "Board Support Packages" (BSPs) and
878 * minimizes board-specific #ifdefs in drivers.
879 * @driver_data: Private pointer for driver specific info.
880 * @links: Links to suppliers and consumers of this device.
881 * @power: For device power management.
882 * See Documentation/driver-api/pm/devices.rst for details.
883 * @pm_domain: Provide callbacks that are executed during system suspend,
884 * hibernation, system resume and during runtime PM transitions
885 * along with subsystem-level and driver-level callbacks.
886 * @pins: For device pin management.
887 * See Documentation/driver-api/pinctl.rst for details.
888 * @msi_list: Hosts MSI descriptors
889 * @msi_domain: The generic MSI domain this device is using.
890 * @numa_node: NUMA node this device is close to.
891 * @dma_ops: DMA mapping operations for this device.
892 * @dma_mask: Dma mask (if dma'ble device).
893 * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
894 * hardware supports 64-bit addresses for consistent allocations
896 * @bus_dma_mask: Mask of an upstream bridge or bus which imposes a smaller DMA
897 * limit than the device itself supports.
898 * @dma_pfn_offset: offset of DMA memory range relatively of RAM
899 * @dma_parms: A low level driver may set these to teach IOMMU code about
900 * segment limitations.
901 * @dma_pools: Dma pools (if dma'ble device).
902 * @dma_mem: Internal for coherent mem override.
903 * @cma_area: Contiguous memory area for dma allocations
904 * @archdata: For arch-specific additions.
905 * @of_node: Associated device tree node.
906 * @fwnode: Associated device node supplied by platform firmware.
907 * @devt: For creating the sysfs "dev".
908 * @id: device instance
909 * @devres_lock: Spinlock to protect the resource of the device.
910 * @devres_head: The resources list of the device.
911 * @knode_class: The node used to add the device to the class list.
912 * @class: The class of the device.
913 * @groups: Optional attribute groups.
914 * @release: Callback to free the device after all references have
915 * gone away. This should be set by the allocator of the
916 * device (i.e. the bus driver that discovered the device).
917 * @iommu_group: IOMMU group the device belongs to.
918 * @iommu_fwspec: IOMMU-specific properties supplied by firmware.
920 * @offline_disabled: If set, the device is permanently online.
921 * @offline: Set after successful invocation of bus type's .offline().
922 * @of_node_reused: Set if the device-tree node is shared with an ancestor
925 * At the lowest level, every device in a Linux system is represented by an
926 * instance of struct device. The device structure contains the information
927 * that the device model core needs to model the system. Most subsystems,
928 * however, track additional information about the devices they host. As a
929 * result, it is rare for devices to be represented by bare device structures;
930 * instead, that structure, like kobject structures, is usually embedded within
931 * a higher-level representation of the device.
934 struct device *parent;
936 struct device_private *p;
939 const char *init_name; /* initial name of the device */
940 const struct device_type *type;
942 struct mutex mutex; /* mutex to synchronize calls to
946 struct bus_type *bus; /* type of bus device is on */
947 struct device_driver *driver; /* which driver has allocated this
949 void *platform_data; /* Platform specific data, device
950 core doesn't touch it */
951 void *driver_data; /* Driver data, set and get with
952 dev_set/get_drvdata */
953 struct dev_links_info links;
954 struct dev_pm_info power;
955 struct dev_pm_domain *pm_domain;
957 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
958 struct irq_domain *msi_domain;
960 #ifdef CONFIG_PINCTRL
961 struct dev_pin_info *pins;
963 #ifdef CONFIG_GENERIC_MSI_IRQ
964 struct list_head msi_list;
968 int numa_node; /* NUMA node this device is close to */
970 const struct dma_map_ops *dma_ops;
971 u64 *dma_mask; /* dma mask (if dma'able device) */
972 u64 coherent_dma_mask;/* Like dma_mask, but for
973 alloc_coherent mappings as
974 not all hardware supports
975 64 bit addresses for consistent
976 allocations such descriptors. */
977 u64 bus_dma_mask; /* upstream dma_mask constraint */
978 unsigned long dma_pfn_offset;
980 struct device_dma_parameters *dma_parms;
982 struct list_head dma_pools; /* dma pools (if dma'ble) */
984 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
986 #ifdef CONFIG_DMA_CMA
987 struct cma *cma_area; /* contiguous memory area for dma
990 /* arch specific additions */
991 struct dev_archdata archdata;
993 struct device_node *of_node; /* associated device tree node */
994 struct fwnode_handle *fwnode; /* firmware device node */
996 dev_t devt; /* dev_t, creates the sysfs "dev" */
997 u32 id; /* device instance */
999 spinlock_t devres_lock;
1000 struct list_head devres_head;
1002 struct klist_node knode_class;
1003 struct class *class;
1004 const struct attribute_group **groups; /* optional groups */
1006 void (*release)(struct device *dev);
1007 struct iommu_group *iommu_group;
1008 struct iommu_fwspec *iommu_fwspec;
1010 bool offline_disabled:1;
1012 bool of_node_reused:1;
1015 static inline struct device *kobj_to_dev(struct kobject *kobj)
1017 return container_of(kobj, struct device, kobj);
1020 /* Get the wakeup routines, which depend on struct device */
1021 #include <linux/pm_wakeup.h>
1023 static inline const char *dev_name(const struct device *dev)
1025 /* Use the init name until the kobject becomes available */
1027 return dev->init_name;
1029 return kobject_name(&dev->kobj);
1032 extern __printf(2, 3)
1033 int dev_set_name(struct device *dev, const char *name, ...);
1036 static inline int dev_to_node(struct device *dev)
1038 return dev->numa_node;
1040 static inline void set_dev_node(struct device *dev, int node)
1042 dev->numa_node = node;
1045 static inline int dev_to_node(struct device *dev)
1049 static inline void set_dev_node(struct device *dev, int node)
1054 static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
1056 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
1057 return dev->msi_domain;
1063 static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d)
1065 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
1066 dev->msi_domain = d;
1070 static inline void *dev_get_drvdata(const struct device *dev)
1072 return dev->driver_data;
1075 static inline void dev_set_drvdata(struct device *dev, void *data)
1077 dev->driver_data = data;
1080 static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
1082 return dev ? dev->power.subsys_data : NULL;
1085 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
1087 return dev->kobj.uevent_suppress;
1090 static inline void dev_set_uevent_suppress(struct device *dev, int val)
1092 dev->kobj.uevent_suppress = val;
1095 static inline int device_is_registered(struct device *dev)
1097 return dev->kobj.state_in_sysfs;
1100 static inline void device_enable_async_suspend(struct device *dev)
1102 if (!dev->power.is_prepared)
1103 dev->power.async_suspend = true;
1106 static inline void device_disable_async_suspend(struct device *dev)
1108 if (!dev->power.is_prepared)
1109 dev->power.async_suspend = false;
1112 static inline bool device_async_suspend_enabled(struct device *dev)
1114 return !!dev->power.async_suspend;
1117 static inline void dev_pm_syscore_device(struct device *dev, bool val)
1119 #ifdef CONFIG_PM_SLEEP
1120 dev->power.syscore = val;
1124 static inline void dev_pm_set_driver_flags(struct device *dev, u32 flags)
1126 dev->power.driver_flags = flags;
1129 static inline bool dev_pm_test_driver_flags(struct device *dev, u32 flags)
1131 return !!(dev->power.driver_flags & flags);
1134 static inline void device_lock(struct device *dev)
1136 mutex_lock(&dev->mutex);
1139 static inline int device_lock_interruptible(struct device *dev)
1141 return mutex_lock_interruptible(&dev->mutex);
1144 static inline int device_trylock(struct device *dev)
1146 return mutex_trylock(&dev->mutex);
1149 static inline void device_unlock(struct device *dev)
1151 mutex_unlock(&dev->mutex);
1154 static inline void device_lock_assert(struct device *dev)
1156 lockdep_assert_held(&dev->mutex);
1159 static inline struct device_node *dev_of_node(struct device *dev)
1161 if (!IS_ENABLED(CONFIG_OF))
1163 return dev->of_node;
1166 void driver_init(void);
1169 * High level routines for use by the bus drivers
1171 extern int __must_check device_register(struct device *dev);
1172 extern void device_unregister(struct device *dev);
1173 extern void device_initialize(struct device *dev);
1174 extern int __must_check device_add(struct device *dev);
1175 extern void device_del(struct device *dev);
1176 extern int device_for_each_child(struct device *dev, void *data,
1177 int (*fn)(struct device *dev, void *data));
1178 extern int device_for_each_child_reverse(struct device *dev, void *data,
1179 int (*fn)(struct device *dev, void *data));
1180 extern struct device *device_find_child(struct device *dev, void *data,
1181 int (*match)(struct device *dev, void *data));
1182 extern int device_rename(struct device *dev, const char *new_name);
1183 extern int device_move(struct device *dev, struct device *new_parent,
1184 enum dpm_order dpm_order);
1185 extern const char *device_get_devnode(struct device *dev,
1186 umode_t *mode, kuid_t *uid, kgid_t *gid,
1189 static inline bool device_supports_offline(struct device *dev)
1191 return dev->bus && dev->bus->offline && dev->bus->online;
1194 extern void lock_device_hotplug(void);
1195 extern void unlock_device_hotplug(void);
1196 extern int lock_device_hotplug_sysfs(void);
1197 extern int device_offline(struct device *dev);
1198 extern int device_online(struct device *dev);
1199 extern void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
1200 extern void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
1201 void device_set_of_node_from_dev(struct device *dev, const struct device *dev2);
1203 static inline int dev_num_vf(struct device *dev)
1205 if (dev->bus && dev->bus->num_vf)
1206 return dev->bus->num_vf(dev);
1211 * Root device objects for grouping under /sys/devices
1213 extern struct device *__root_device_register(const char *name,
1214 struct module *owner);
1216 /* This is a macro to avoid include problems with THIS_MODULE */
1217 #define root_device_register(name) \
1218 __root_device_register(name, THIS_MODULE)
1220 extern void root_device_unregister(struct device *root);
1222 static inline void *dev_get_platdata(const struct device *dev)
1224 return dev->platform_data;
1228 * Manual binding of a device to driver. See drivers/base/bus.c
1229 * for information on use.
1231 extern int __must_check device_bind_driver(struct device *dev);
1232 extern void device_release_driver(struct device *dev);
1233 extern int __must_check device_attach(struct device *dev);
1234 extern int __must_check driver_attach(struct device_driver *drv);
1235 extern void device_initial_probe(struct device *dev);
1236 extern int __must_check device_reprobe(struct device *dev);
1238 extern bool device_is_bound(struct device *dev);
1241 * Easy functions for dynamically creating devices on the fly
1243 extern __printf(5, 0)
1244 struct device *device_create_vargs(struct class *cls, struct device *parent,
1245 dev_t devt, void *drvdata,
1246 const char *fmt, va_list vargs);
1247 extern __printf(5, 6)
1248 struct device *device_create(struct class *cls, struct device *parent,
1249 dev_t devt, void *drvdata,
1250 const char *fmt, ...);
1251 extern __printf(6, 7)
1252 struct device *device_create_with_groups(struct class *cls,
1253 struct device *parent, dev_t devt, void *drvdata,
1254 const struct attribute_group **groups,
1255 const char *fmt, ...);
1256 extern void device_destroy(struct class *cls, dev_t devt);
1258 extern int __must_check device_add_groups(struct device *dev,
1259 const struct attribute_group **groups);
1260 extern void device_remove_groups(struct device *dev,
1261 const struct attribute_group **groups);
1263 static inline int __must_check device_add_group(struct device *dev,
1264 const struct attribute_group *grp)
1266 const struct attribute_group *groups[] = { grp, NULL };
1268 return device_add_groups(dev, groups);
1271 static inline void device_remove_group(struct device *dev,
1272 const struct attribute_group *grp)
1274 const struct attribute_group *groups[] = { grp, NULL };
1276 return device_remove_groups(dev, groups);
1279 extern int __must_check devm_device_add_groups(struct device *dev,
1280 const struct attribute_group **groups);
1281 extern void devm_device_remove_groups(struct device *dev,
1282 const struct attribute_group **groups);
1283 extern int __must_check devm_device_add_group(struct device *dev,
1284 const struct attribute_group *grp);
1285 extern void devm_device_remove_group(struct device *dev,
1286 const struct attribute_group *grp);
1289 * Platform "fixup" functions - allow the platform to have their say
1290 * about devices and actions that the general device layer doesn't
1293 /* Notify platform of device discovery */
1294 extern int (*platform_notify)(struct device *dev);
1296 extern int (*platform_notify_remove)(struct device *dev);
1300 * get_device - atomically increment the reference count for the device.
1303 extern struct device *get_device(struct device *dev);
1304 extern void put_device(struct device *dev);
1306 #ifdef CONFIG_DEVTMPFS
1307 extern int devtmpfs_create_node(struct device *dev);
1308 extern int devtmpfs_delete_node(struct device *dev);
1309 extern int devtmpfs_mount(const char *mntdir);
1311 static inline int devtmpfs_create_node(struct device *dev) { return 0; }
1312 static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
1313 static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
1316 /* drivers/base/power/shutdown.c */
1317 extern void device_shutdown(void);
1319 /* debugging and troubleshooting/diagnostic helpers. */
1320 extern const char *dev_driver_string(const struct device *dev);
1322 /* Device links interface. */
1323 struct device_link *device_link_add(struct device *consumer,
1324 struct device *supplier, u32 flags);
1325 void device_link_del(struct device_link *link);
1326 void device_link_remove(void *consumer, struct device *supplier);
1328 #ifdef CONFIG_PRINTK
1330 extern __printf(3, 0)
1331 int dev_vprintk_emit(int level, const struct device *dev,
1332 const char *fmt, va_list args);
1333 extern __printf(3, 4)
1334 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...);
1336 extern __printf(3, 4)
1337 void dev_printk(const char *level, const struct device *dev,
1338 const char *fmt, ...);
1339 extern __printf(2, 3)
1340 void dev_emerg(const struct device *dev, const char *fmt, ...);
1341 extern __printf(2, 3)
1342 void dev_alert(const struct device *dev, const char *fmt, ...);
1343 extern __printf(2, 3)
1344 void dev_crit(const struct device *dev, const char *fmt, ...);
1345 extern __printf(2, 3)
1346 void dev_err(const struct device *dev, const char *fmt, ...);
1347 extern __printf(2, 3)
1348 void dev_warn(const struct device *dev, const char *fmt, ...);
1349 extern __printf(2, 3)
1350 void dev_notice(const struct device *dev, const char *fmt, ...);
1351 extern __printf(2, 3)
1352 void _dev_info(const struct device *dev, const char *fmt, ...);
1356 static inline __printf(3, 0)
1357 int dev_vprintk_emit(int level, const struct device *dev,
1358 const char *fmt, va_list args)
1360 static inline __printf(3, 4)
1361 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
1364 static inline void __dev_printk(const char *level, const struct device *dev,
1365 struct va_format *vaf)
1367 static inline __printf(3, 4)
1368 void dev_printk(const char *level, const struct device *dev,
1369 const char *fmt, ...)
1372 static inline __printf(2, 3)
1373 void dev_emerg(const struct device *dev, const char *fmt, ...)
1375 static inline __printf(2, 3)
1376 void dev_crit(const struct device *dev, const char *fmt, ...)
1378 static inline __printf(2, 3)
1379 void dev_alert(const struct device *dev, const char *fmt, ...)
1381 static inline __printf(2, 3)
1382 void dev_err(const struct device *dev, const char *fmt, ...)
1384 static inline __printf(2, 3)
1385 void dev_warn(const struct device *dev, const char *fmt, ...)
1387 static inline __printf(2, 3)
1388 void dev_notice(const struct device *dev, const char *fmt, ...)
1390 static inline __printf(2, 3)
1391 void _dev_info(const struct device *dev, const char *fmt, ...)
1397 * Stupid hackaround for existing uses of non-printk uses dev_info
1399 * Note that the definition of dev_info below is actually _dev_info
1400 * and a macro is used to avoid redefining dev_info
1403 #define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)
1405 #if defined(CONFIG_DYNAMIC_DEBUG)
1406 #define dev_dbg(dev, format, ...) \
1408 dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
1410 #elif defined(DEBUG)
1411 #define dev_dbg(dev, format, arg...) \
1412 dev_printk(KERN_DEBUG, dev, format, ##arg)
1414 #define dev_dbg(dev, format, arg...) \
1417 dev_printk(KERN_DEBUG, dev, format, ##arg); \
1421 #ifdef CONFIG_PRINTK
1422 #define dev_level_once(dev_level, dev, fmt, ...) \
1424 static bool __print_once __read_mostly; \
1426 if (!__print_once) { \
1427 __print_once = true; \
1428 dev_level(dev, fmt, ##__VA_ARGS__); \
1432 #define dev_level_once(dev_level, dev, fmt, ...) \
1435 dev_level(dev, fmt, ##__VA_ARGS__); \
1439 #define dev_emerg_once(dev, fmt, ...) \
1440 dev_level_once(dev_emerg, dev, fmt, ##__VA_ARGS__)
1441 #define dev_alert_once(dev, fmt, ...) \
1442 dev_level_once(dev_alert, dev, fmt, ##__VA_ARGS__)
1443 #define dev_crit_once(dev, fmt, ...) \
1444 dev_level_once(dev_crit, dev, fmt, ##__VA_ARGS__)
1445 #define dev_err_once(dev, fmt, ...) \
1446 dev_level_once(dev_err, dev, fmt, ##__VA_ARGS__)
1447 #define dev_warn_once(dev, fmt, ...) \
1448 dev_level_once(dev_warn, dev, fmt, ##__VA_ARGS__)
1449 #define dev_notice_once(dev, fmt, ...) \
1450 dev_level_once(dev_notice, dev, fmt, ##__VA_ARGS__)
1451 #define dev_info_once(dev, fmt, ...) \
1452 dev_level_once(dev_info, dev, fmt, ##__VA_ARGS__)
1453 #define dev_dbg_once(dev, fmt, ...) \
1454 dev_level_once(dev_dbg, dev, fmt, ##__VA_ARGS__)
1456 #define dev_level_ratelimited(dev_level, dev, fmt, ...) \
1458 static DEFINE_RATELIMIT_STATE(_rs, \
1459 DEFAULT_RATELIMIT_INTERVAL, \
1460 DEFAULT_RATELIMIT_BURST); \
1461 if (__ratelimit(&_rs)) \
1462 dev_level(dev, fmt, ##__VA_ARGS__); \
1465 #define dev_emerg_ratelimited(dev, fmt, ...) \
1466 dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__)
1467 #define dev_alert_ratelimited(dev, fmt, ...) \
1468 dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__)
1469 #define dev_crit_ratelimited(dev, fmt, ...) \
1470 dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__)
1471 #define dev_err_ratelimited(dev, fmt, ...) \
1472 dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__)
1473 #define dev_warn_ratelimited(dev, fmt, ...) \
1474 dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__)
1475 #define dev_notice_ratelimited(dev, fmt, ...) \
1476 dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
1477 #define dev_info_ratelimited(dev, fmt, ...) \
1478 dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
1479 #if defined(CONFIG_DYNAMIC_DEBUG)
1480 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
1481 #define dev_dbg_ratelimited(dev, fmt, ...) \
1483 static DEFINE_RATELIMIT_STATE(_rs, \
1484 DEFAULT_RATELIMIT_INTERVAL, \
1485 DEFAULT_RATELIMIT_BURST); \
1486 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
1487 if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) && \
1488 __ratelimit(&_rs)) \
1489 __dynamic_dev_dbg(&descriptor, dev, fmt, \
1492 #elif defined(DEBUG)
1493 #define dev_dbg_ratelimited(dev, fmt, ...) \
1495 static DEFINE_RATELIMIT_STATE(_rs, \
1496 DEFAULT_RATELIMIT_INTERVAL, \
1497 DEFAULT_RATELIMIT_BURST); \
1498 if (__ratelimit(&_rs)) \
1499 dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \
1502 #define dev_dbg_ratelimited(dev, fmt, ...) \
1505 dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \
1509 #ifdef VERBOSE_DEBUG
1510 #define dev_vdbg dev_dbg
1512 #define dev_vdbg(dev, format, arg...) \
1515 dev_printk(KERN_DEBUG, dev, format, ##arg); \
1520 * dev_WARN*() acts like dev_printk(), but with the key difference of
1521 * using WARN/WARN_ONCE to include file/line information and a backtrace.
1523 #define dev_WARN(dev, format, arg...) \
1524 WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg);
1526 #define dev_WARN_ONCE(dev, condition, format, arg...) \
1527 WARN_ONCE(condition, "%s %s: " format, \
1528 dev_driver_string(dev), dev_name(dev), ## arg)
1530 /* Create alias, so I can be autoloaded. */
1531 #define MODULE_ALIAS_CHARDEV(major,minor) \
1532 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
1533 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
1534 MODULE_ALIAS("char-major-" __stringify(major) "-*")
1536 #ifdef CONFIG_SYSFS_DEPRECATED
1537 extern long sysfs_deprecated;
1539 #define sysfs_deprecated 0
1543 * module_driver() - Helper macro for drivers that don't do anything
1544 * special in module init/exit. This eliminates a lot of boilerplate.
1545 * Each module may only use this macro once, and calling it replaces
1546 * module_init() and module_exit().
1548 * @__driver: driver name
1549 * @__register: register function for this driver type
1550 * @__unregister: unregister function for this driver type
1551 * @...: Additional arguments to be passed to __register and __unregister.
1553 * Use this macro to construct bus specific macros for registering
1554 * drivers, and do not use it on its own.
1556 #define module_driver(__driver, __register, __unregister, ...) \
1557 static int __init __driver##_init(void) \
1559 return __register(&(__driver) , ##__VA_ARGS__); \
1561 module_init(__driver##_init); \
1562 static void __exit __driver##_exit(void) \
1564 __unregister(&(__driver) , ##__VA_ARGS__); \
1566 module_exit(__driver##_exit);
1569 * builtin_driver() - Helper macro for drivers that don't do anything
1570 * special in init and have no exit. This eliminates some boilerplate.
1571 * Each driver may only use this macro once, and calling it replaces
1572 * device_initcall (or in some cases, the legacy __initcall). This is
1573 * meant to be a direct parallel of module_driver() above but without
1574 * the __exit stuff that is not used for builtin cases.
1576 * @__driver: driver name
1577 * @__register: register function for this driver type
1578 * @...: Additional arguments to be passed to __register
1580 * Use this macro to construct bus specific macros for registering
1581 * drivers, and do not use it on its own.
1583 #define builtin_driver(__driver, __register, ...) \
1584 static int __init __driver##_init(void) \
1586 return __register(&(__driver) , ##__VA_ARGS__); \
1588 device_initcall(__driver##_init);
1590 #endif /* _DEVICE_H_ */