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));
342 int driver_deferred_probe_check_state(struct device *dev);
345 * struct subsys_interface - interfaces to device functions
346 * @name: name of the device function
347 * @subsys: subsytem of the devices to attach to
348 * @node: the list of functions registered at the subsystem
349 * @add_dev: device hookup to device function handler
350 * @remove_dev: device hookup to device function handler
352 * Simple interfaces attached to a subsystem. Multiple interfaces can
353 * attach to a subsystem and its devices. Unlike drivers, they do not
354 * exclusively claim or control devices. Interfaces usually represent
355 * a specific functionality of a subsystem/class of devices.
357 struct subsys_interface {
359 struct bus_type *subsys;
360 struct list_head node;
361 int (*add_dev)(struct device *dev, struct subsys_interface *sif);
362 void (*remove_dev)(struct device *dev, struct subsys_interface *sif);
365 int subsys_interface_register(struct subsys_interface *sif);
366 void subsys_interface_unregister(struct subsys_interface *sif);
368 int subsys_system_register(struct bus_type *subsys,
369 const struct attribute_group **groups);
370 int subsys_virtual_register(struct bus_type *subsys,
371 const struct attribute_group **groups);
374 * struct class - device classes
375 * @name: Name of the class.
376 * @owner: The module owner.
377 * @class_groups: Default attributes of this class.
378 * @dev_groups: Default attributes of the devices that belong to the class.
379 * @dev_kobj: The kobject that represents this class and links it into the hierarchy.
380 * @dev_uevent: Called when a device is added, removed from this class, or a
381 * few other things that generate uevents to add the environment
383 * @devnode: Callback to provide the devtmpfs.
384 * @class_release: Called to release this class.
385 * @dev_release: Called to release the device.
386 * @shutdown_pre: Called at shut-down time before driver shutdown.
387 * @ns_type: Callbacks so sysfs can detemine namespaces.
388 * @namespace: Namespace of the device belongs to this class.
389 * @get_ownership: Allows class to specify uid/gid of the sysfs directories
390 * for the devices belonging to the class. Usually tied to
391 * device's namespace.
392 * @pm: The default device power management operations of this class.
393 * @p: The private data of the driver core, no one other than the
394 * driver core can touch this.
396 * A class is a higher-level view of a device that abstracts out low-level
397 * implementation details. Drivers may see a SCSI disk or an ATA disk, but,
398 * at the class level, they are all simply disks. Classes allow user space
399 * to work with devices based on what they do, rather than how they are
400 * connected or how they work.
404 struct module *owner;
406 const struct attribute_group **class_groups;
407 const struct attribute_group **dev_groups;
408 struct kobject *dev_kobj;
410 int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
411 char *(*devnode)(struct device *dev, umode_t *mode);
413 void (*class_release)(struct class *class);
414 void (*dev_release)(struct device *dev);
416 int (*shutdown_pre)(struct device *dev);
418 const struct kobj_ns_type_operations *ns_type;
419 const void *(*namespace)(struct device *dev);
421 void (*get_ownership)(struct device *dev, kuid_t *uid, kgid_t *gid);
423 const struct dev_pm_ops *pm;
425 struct subsys_private *p;
428 struct class_dev_iter {
429 struct klist_iter ki;
430 const struct device_type *type;
433 extern struct kobject *sysfs_dev_block_kobj;
434 extern struct kobject *sysfs_dev_char_kobj;
435 extern int __must_check __class_register(struct class *class,
436 struct lock_class_key *key);
437 extern void class_unregister(struct class *class);
439 /* This is a #define to keep the compiler from merging different
440 * instances of the __key variable */
441 #define class_register(class) \
443 static struct lock_class_key __key; \
444 __class_register(class, &__key); \
448 struct class_compat *class_compat_register(const char *name);
449 void class_compat_unregister(struct class_compat *cls);
450 int class_compat_create_link(struct class_compat *cls, struct device *dev,
451 struct device *device_link);
452 void class_compat_remove_link(struct class_compat *cls, struct device *dev,
453 struct device *device_link);
455 extern void class_dev_iter_init(struct class_dev_iter *iter,
457 struct device *start,
458 const struct device_type *type);
459 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
460 extern void class_dev_iter_exit(struct class_dev_iter *iter);
462 extern int class_for_each_device(struct class *class, struct device *start,
464 int (*fn)(struct device *dev, void *data));
465 extern struct device *class_find_device(struct class *class,
466 struct device *start, const void *data,
467 int (*match)(struct device *, const void *));
469 struct class_attribute {
470 struct attribute attr;
471 ssize_t (*show)(struct class *class, struct class_attribute *attr,
473 ssize_t (*store)(struct class *class, struct class_attribute *attr,
474 const char *buf, size_t count);
477 #define CLASS_ATTR_RW(_name) \
478 struct class_attribute class_attr_##_name = __ATTR_RW(_name)
479 #define CLASS_ATTR_RO(_name) \
480 struct class_attribute class_attr_##_name = __ATTR_RO(_name)
481 #define CLASS_ATTR_WO(_name) \
482 struct class_attribute class_attr_##_name = __ATTR_WO(_name)
484 extern int __must_check class_create_file_ns(struct class *class,
485 const struct class_attribute *attr,
487 extern void class_remove_file_ns(struct class *class,
488 const struct class_attribute *attr,
491 static inline int __must_check class_create_file(struct class *class,
492 const struct class_attribute *attr)
494 return class_create_file_ns(class, attr, NULL);
497 static inline void class_remove_file(struct class *class,
498 const struct class_attribute *attr)
500 return class_remove_file_ns(class, attr, NULL);
503 /* Simple class attribute that is just a static string */
504 struct class_attribute_string {
505 struct class_attribute attr;
509 /* Currently read-only only */
510 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
511 { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
512 #define CLASS_ATTR_STRING(_name, _mode, _str) \
513 struct class_attribute_string class_attr_##_name = \
514 _CLASS_ATTR_STRING(_name, _mode, _str)
516 extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
519 struct class_interface {
520 struct list_head node;
523 int (*add_dev) (struct device *, struct class_interface *);
524 void (*remove_dev) (struct device *, struct class_interface *);
527 extern int __must_check class_interface_register(struct class_interface *);
528 extern void class_interface_unregister(struct class_interface *);
530 extern struct class * __must_check __class_create(struct module *owner,
532 struct lock_class_key *key);
533 extern void class_destroy(struct class *cls);
535 /* This is a #define to keep the compiler from merging different
536 * instances of the __key variable */
537 #define class_create(owner, name) \
539 static struct lock_class_key __key; \
540 __class_create(owner, name, &__key); \
544 * The type of device, "struct device" is embedded in. A class
545 * or bus can contain devices of different types
546 * like "partitions" and "disks", "mouse" and "event".
547 * This identifies the device type and carries type-specific
548 * information, equivalent to the kobj_type of a kobject.
549 * If "name" is specified, the uevent will contain it in
550 * the DEVTYPE variable.
554 const struct attribute_group **groups;
555 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
556 char *(*devnode)(struct device *dev, umode_t *mode,
557 kuid_t *uid, kgid_t *gid);
558 void (*release)(struct device *dev);
560 const struct dev_pm_ops *pm;
563 /* interface for exporting device attributes */
564 struct device_attribute {
565 struct attribute attr;
566 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
568 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
569 const char *buf, size_t count);
572 struct dev_ext_attribute {
573 struct device_attribute attr;
577 ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
579 ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
580 const char *buf, size_t count);
581 ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
583 ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
584 const char *buf, size_t count);
585 ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
587 ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
588 const char *buf, size_t count);
590 #define DEVICE_ATTR(_name, _mode, _show, _store) \
591 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
592 #define DEVICE_ATTR_PREALLOC(_name, _mode, _show, _store) \
593 struct device_attribute dev_attr_##_name = \
594 __ATTR_PREALLOC(_name, _mode, _show, _store)
595 #define DEVICE_ATTR_RW(_name) \
596 struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
597 #define DEVICE_ATTR_RO(_name) \
598 struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
599 #define DEVICE_ATTR_WO(_name) \
600 struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
601 #define DEVICE_ULONG_ATTR(_name, _mode, _var) \
602 struct dev_ext_attribute dev_attr_##_name = \
603 { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
604 #define DEVICE_INT_ATTR(_name, _mode, _var) \
605 struct dev_ext_attribute dev_attr_##_name = \
606 { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
607 #define DEVICE_BOOL_ATTR(_name, _mode, _var) \
608 struct dev_ext_attribute dev_attr_##_name = \
609 { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
610 #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
611 struct device_attribute dev_attr_##_name = \
612 __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
614 extern int device_create_file(struct device *device,
615 const struct device_attribute *entry);
616 extern void device_remove_file(struct device *dev,
617 const struct device_attribute *attr);
618 extern bool device_remove_file_self(struct device *dev,
619 const struct device_attribute *attr);
620 extern int __must_check device_create_bin_file(struct device *dev,
621 const struct bin_attribute *attr);
622 extern void device_remove_bin_file(struct device *dev,
623 const struct bin_attribute *attr);
625 /* device resource management */
626 typedef void (*dr_release_t)(struct device *dev, void *res);
627 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
629 #ifdef CONFIG_DEBUG_DEVRES
630 extern void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
631 int nid, const char *name) __malloc;
632 #define devres_alloc(release, size, gfp) \
633 __devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release)
634 #define devres_alloc_node(release, size, gfp, nid) \
635 __devres_alloc_node(release, size, gfp, nid, #release)
637 extern void *devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
639 static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
641 return devres_alloc_node(release, size, gfp, NUMA_NO_NODE);
645 extern void devres_for_each_res(struct device *dev, dr_release_t release,
646 dr_match_t match, void *match_data,
647 void (*fn)(struct device *, void *, void *),
649 extern void devres_free(void *res);
650 extern void devres_add(struct device *dev, void *res);
651 extern void *devres_find(struct device *dev, dr_release_t release,
652 dr_match_t match, void *match_data);
653 extern void *devres_get(struct device *dev, void *new_res,
654 dr_match_t match, void *match_data);
655 extern void *devres_remove(struct device *dev, dr_release_t release,
656 dr_match_t match, void *match_data);
657 extern int devres_destroy(struct device *dev, dr_release_t release,
658 dr_match_t match, void *match_data);
659 extern int devres_release(struct device *dev, dr_release_t release,
660 dr_match_t match, void *match_data);
663 extern void * __must_check devres_open_group(struct device *dev, void *id,
665 extern void devres_close_group(struct device *dev, void *id);
666 extern void devres_remove_group(struct device *dev, void *id);
667 extern int devres_release_group(struct device *dev, void *id);
669 /* managed devm_k.alloc/kfree for device drivers */
670 extern void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
671 extern __printf(3, 0)
672 char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt,
673 va_list ap) __malloc;
674 extern __printf(3, 4)
675 char *devm_kasprintf(struct device *dev, gfp_t gfp, const char *fmt, ...) __malloc;
676 static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
678 return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
680 static inline void *devm_kmalloc_array(struct device *dev,
681 size_t n, size_t size, gfp_t flags)
685 if (unlikely(check_mul_overflow(n, size, &bytes)))
688 return devm_kmalloc(dev, bytes, flags);
690 static inline void *devm_kcalloc(struct device *dev,
691 size_t n, size_t size, gfp_t flags)
693 return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
695 extern void devm_kfree(struct device *dev, void *p);
696 extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
697 extern void *devm_kmemdup(struct device *dev, const void *src, size_t len,
700 extern unsigned long devm_get_free_pages(struct device *dev,
701 gfp_t gfp_mask, unsigned int order);
702 extern void devm_free_pages(struct device *dev, unsigned long addr);
704 void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);
706 void __iomem *devm_of_iomap(struct device *dev,
707 struct device_node *node, int index,
708 resource_size_t *size);
710 /* allows to add/remove a custom action to devres stack */
711 int devm_add_action(struct device *dev, void (*action)(void *), void *data);
712 void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
714 static inline int devm_add_action_or_reset(struct device *dev,
715 void (*action)(void *), void *data)
719 ret = devm_add_action(dev, action, data);
727 * devm_alloc_percpu - Resource-managed alloc_percpu
728 * @dev: Device to allocate per-cpu memory for
729 * @type: Type to allocate per-cpu memory for
731 * Managed alloc_percpu. Per-cpu memory allocated with this function is
732 * automatically freed on driver detach.
735 * Pointer to allocated memory on success, NULL on failure.
737 #define devm_alloc_percpu(dev, type) \
738 ((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), \
741 void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,
743 void devm_free_percpu(struct device *dev, void __percpu *pdata);
745 struct device_dma_parameters {
747 * a low level driver may set these to teach IOMMU code about
750 unsigned int max_segment_size;
751 unsigned long segment_boundary_mask;
755 * struct device_connection - Device Connection Descriptor
756 * @endpoint: The names of the two devices connected together
757 * @id: Unique identifier for the connection
758 * @list: List head, private, for internal use only
760 struct device_connection {
761 const char *endpoint[2];
763 struct list_head list;
766 void *device_connection_find_match(struct device *dev, const char *con_id,
768 void *(*match)(struct device_connection *con,
769 int ep, void *data));
771 struct device *device_connection_find(struct device *dev, const char *con_id);
773 void device_connection_add(struct device_connection *con);
774 void device_connection_remove(struct device_connection *con);
777 * device_connections_add - Add multiple device connections at once
778 * @cons: Zero terminated array of device connection descriptors
780 static inline void device_connections_add(struct device_connection *cons)
782 struct device_connection *c;
784 for (c = cons; c->endpoint[0]; c++)
785 device_connection_add(c);
789 * device_connections_remove - Remove multiple device connections at once
790 * @cons: Zero terminated array of device connection descriptors
792 static inline void device_connections_remove(struct device_connection *cons)
794 struct device_connection *c;
796 for (c = cons; c->endpoint[0]; c++)
797 device_connection_remove(c);
801 * enum device_link_state - Device link states.
802 * @DL_STATE_NONE: The presence of the drivers is not being tracked.
803 * @DL_STATE_DORMANT: None of the supplier/consumer drivers is present.
804 * @DL_STATE_AVAILABLE: The supplier driver is present, but the consumer is not.
805 * @DL_STATE_CONSUMER_PROBE: The consumer is probing (supplier driver present).
806 * @DL_STATE_ACTIVE: Both the supplier and consumer drivers are present.
807 * @DL_STATE_SUPPLIER_UNBIND: The supplier driver is unbinding.
809 enum device_link_state {
811 DL_STATE_DORMANT = 0,
813 DL_STATE_CONSUMER_PROBE,
815 DL_STATE_SUPPLIER_UNBIND,
821 * STATELESS: The core won't track the presence of supplier/consumer drivers.
822 * AUTOREMOVE_CONSUMER: Remove the link automatically on consumer driver unbind.
823 * PM_RUNTIME: If set, the runtime PM framework will use this link.
824 * RPM_ACTIVE: Run pm_runtime_get_sync() on the supplier during link creation.
825 * AUTOREMOVE_SUPPLIER: Remove the link automatically on supplier driver unbind.
827 #define DL_FLAG_STATELESS BIT(0)
828 #define DL_FLAG_AUTOREMOVE_CONSUMER BIT(1)
829 #define DL_FLAG_PM_RUNTIME BIT(2)
830 #define DL_FLAG_RPM_ACTIVE BIT(3)
831 #define DL_FLAG_AUTOREMOVE_SUPPLIER BIT(4)
834 * struct device_link - Device link representation.
835 * @supplier: The device on the supplier end of the link.
836 * @s_node: Hook to the supplier device's list of links to consumers.
837 * @consumer: The device on the consumer end of the link.
838 * @c_node: Hook to the consumer device's list of links to suppliers.
839 * @status: The state of the link (with respect to the presence of drivers).
840 * @flags: Link flags.
841 * @rpm_active: Whether or not the consumer device is runtime-PM-active.
842 * @kref: Count repeated addition of the same link.
843 * @rcu_head: An RCU head to use for deferred execution of SRCU callbacks.
846 struct device *supplier;
847 struct list_head s_node;
848 struct device *consumer;
849 struct list_head c_node;
850 enum device_link_state status;
855 struct rcu_head rcu_head;
860 * enum dl_dev_state - Device driver presence tracking information.
861 * @DL_DEV_NO_DRIVER: There is no driver attached to the device.
862 * @DL_DEV_PROBING: A driver is probing.
863 * @DL_DEV_DRIVER_BOUND: The driver has been bound to the device.
864 * @DL_DEV_UNBINDING: The driver is unbinding from the device.
867 DL_DEV_NO_DRIVER = 0,
874 * struct dev_links_info - Device data related to device links.
875 * @suppliers: List of links to supplier devices.
876 * @consumers: List of links to consumer devices.
877 * @status: Driver status information.
879 struct dev_links_info {
880 struct list_head suppliers;
881 struct list_head consumers;
882 enum dl_dev_state status;
886 * struct device - The basic device structure
887 * @parent: The device's "parent" device, the device to which it is attached.
888 * In most cases, a parent device is some sort of bus or host
889 * controller. If parent is NULL, the device, is a top-level device,
890 * which is not usually what you want.
891 * @p: Holds the private data of the driver core portions of the device.
892 * See the comment of the struct device_private for detail.
893 * @kobj: A top-level, abstract class from which other classes are derived.
894 * @init_name: Initial name of the device.
895 * @type: The type of device.
896 * This identifies the device type and carries type-specific
898 * @mutex: Mutex to synchronize calls to its driver.
899 * @bus: Type of bus device is on.
900 * @driver: Which driver has allocated this
901 * @platform_data: Platform data specific to the device.
902 * Example: For devices on custom boards, as typical of embedded
903 * and SOC based hardware, Linux often uses platform_data to point
904 * to board-specific structures describing devices and how they
905 * are wired. That can include what ports are available, chip
906 * variants, which GPIO pins act in what additional roles, and so
907 * on. This shrinks the "Board Support Packages" (BSPs) and
908 * minimizes board-specific #ifdefs in drivers.
909 * @driver_data: Private pointer for driver specific info.
910 * @links: Links to suppliers and consumers of this device.
911 * @power: For device power management.
912 * See Documentation/driver-api/pm/devices.rst for details.
913 * @pm_domain: Provide callbacks that are executed during system suspend,
914 * hibernation, system resume and during runtime PM transitions
915 * along with subsystem-level and driver-level callbacks.
916 * @pins: For device pin management.
917 * See Documentation/driver-api/pinctl.rst for details.
918 * @msi_list: Hosts MSI descriptors
919 * @msi_domain: The generic MSI domain this device is using.
920 * @numa_node: NUMA node this device is close to.
921 * @dma_ops: DMA mapping operations for this device.
922 * @dma_mask: Dma mask (if dma'ble device).
923 * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
924 * hardware supports 64-bit addresses for consistent allocations
926 * @bus_dma_mask: Mask of an upstream bridge or bus which imposes a smaller DMA
927 * limit than the device itself supports.
928 * @dma_pfn_offset: offset of DMA memory range relatively of RAM
929 * @dma_parms: A low level driver may set these to teach IOMMU code about
930 * segment limitations.
931 * @dma_pools: Dma pools (if dma'ble device).
932 * @dma_mem: Internal for coherent mem override.
933 * @cma_area: Contiguous memory area for dma allocations
934 * @archdata: For arch-specific additions.
935 * @of_node: Associated device tree node.
936 * @fwnode: Associated device node supplied by platform firmware.
937 * @devt: For creating the sysfs "dev".
938 * @id: device instance
939 * @devres_lock: Spinlock to protect the resource of the device.
940 * @devres_head: The resources list of the device.
941 * @knode_class: The node used to add the device to the class list.
942 * @class: The class of the device.
943 * @groups: Optional attribute groups.
944 * @release: Callback to free the device after all references have
945 * gone away. This should be set by the allocator of the
946 * device (i.e. the bus driver that discovered the device).
947 * @iommu_group: IOMMU group the device belongs to.
948 * @iommu_fwspec: IOMMU-specific properties supplied by firmware.
950 * @offline_disabled: If set, the device is permanently online.
951 * @offline: Set after successful invocation of bus type's .offline().
952 * @of_node_reused: Set if the device-tree node is shared with an ancestor
955 * At the lowest level, every device in a Linux system is represented by an
956 * instance of struct device. The device structure contains the information
957 * that the device model core needs to model the system. Most subsystems,
958 * however, track additional information about the devices they host. As a
959 * result, it is rare for devices to be represented by bare device structures;
960 * instead, that structure, like kobject structures, is usually embedded within
961 * a higher-level representation of the device.
964 struct device *parent;
966 struct device_private *p;
969 const char *init_name; /* initial name of the device */
970 const struct device_type *type;
972 struct mutex mutex; /* mutex to synchronize calls to
976 struct bus_type *bus; /* type of bus device is on */
977 struct device_driver *driver; /* which driver has allocated this
979 void *platform_data; /* Platform specific data, device
980 core doesn't touch it */
981 void *driver_data; /* Driver data, set and get with
982 dev_set/get_drvdata */
983 struct dev_links_info links;
984 struct dev_pm_info power;
985 struct dev_pm_domain *pm_domain;
987 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
988 struct irq_domain *msi_domain;
990 #ifdef CONFIG_PINCTRL
991 struct dev_pin_info *pins;
993 #ifdef CONFIG_GENERIC_MSI_IRQ
994 struct list_head msi_list;
998 int numa_node; /* NUMA node this device is close to */
1000 const struct dma_map_ops *dma_ops;
1001 u64 *dma_mask; /* dma mask (if dma'able device) */
1002 u64 coherent_dma_mask;/* Like dma_mask, but for
1003 alloc_coherent mappings as
1004 not all hardware supports
1005 64 bit addresses for consistent
1006 allocations such descriptors. */
1007 u64 bus_dma_mask; /* upstream dma_mask constraint */
1008 unsigned long dma_pfn_offset;
1010 struct device_dma_parameters *dma_parms;
1012 struct list_head dma_pools; /* dma pools (if dma'ble) */
1014 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
1016 #ifdef CONFIG_DMA_CMA
1017 struct cma *cma_area; /* contiguous memory area for dma
1020 /* arch specific additions */
1021 struct dev_archdata archdata;
1023 struct device_node *of_node; /* associated device tree node */
1024 struct fwnode_handle *fwnode; /* firmware device node */
1026 dev_t devt; /* dev_t, creates the sysfs "dev" */
1027 u32 id; /* device instance */
1029 spinlock_t devres_lock;
1030 struct list_head devres_head;
1032 struct klist_node knode_class;
1033 struct class *class;
1034 const struct attribute_group **groups; /* optional groups */
1036 void (*release)(struct device *dev);
1037 struct iommu_group *iommu_group;
1038 struct iommu_fwspec *iommu_fwspec;
1040 bool offline_disabled:1;
1042 bool of_node_reused:1;
1045 static inline struct device *kobj_to_dev(struct kobject *kobj)
1047 return container_of(kobj, struct device, kobj);
1050 /* Get the wakeup routines, which depend on struct device */
1051 #include <linux/pm_wakeup.h>
1053 static inline const char *dev_name(const struct device *dev)
1055 /* Use the init name until the kobject becomes available */
1057 return dev->init_name;
1059 return kobject_name(&dev->kobj);
1062 extern __printf(2, 3)
1063 int dev_set_name(struct device *dev, const char *name, ...);
1066 static inline int dev_to_node(struct device *dev)
1068 return dev->numa_node;
1070 static inline void set_dev_node(struct device *dev, int node)
1072 dev->numa_node = node;
1075 static inline int dev_to_node(struct device *dev)
1079 static inline void set_dev_node(struct device *dev, int node)
1084 static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
1086 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
1087 return dev->msi_domain;
1093 static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d)
1095 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
1096 dev->msi_domain = d;
1100 static inline void *dev_get_drvdata(const struct device *dev)
1102 return dev->driver_data;
1105 static inline void dev_set_drvdata(struct device *dev, void *data)
1107 dev->driver_data = data;
1110 static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
1112 return dev ? dev->power.subsys_data : NULL;
1115 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
1117 return dev->kobj.uevent_suppress;
1120 static inline void dev_set_uevent_suppress(struct device *dev, int val)
1122 dev->kobj.uevent_suppress = val;
1125 static inline int device_is_registered(struct device *dev)
1127 return dev->kobj.state_in_sysfs;
1130 static inline void device_enable_async_suspend(struct device *dev)
1132 if (!dev->power.is_prepared)
1133 dev->power.async_suspend = true;
1136 static inline void device_disable_async_suspend(struct device *dev)
1138 if (!dev->power.is_prepared)
1139 dev->power.async_suspend = false;
1142 static inline bool device_async_suspend_enabled(struct device *dev)
1144 return !!dev->power.async_suspend;
1147 static inline void dev_pm_syscore_device(struct device *dev, bool val)
1149 #ifdef CONFIG_PM_SLEEP
1150 dev->power.syscore = val;
1154 static inline void dev_pm_set_driver_flags(struct device *dev, u32 flags)
1156 dev->power.driver_flags = flags;
1159 static inline bool dev_pm_test_driver_flags(struct device *dev, u32 flags)
1161 return !!(dev->power.driver_flags & flags);
1164 static inline void device_lock(struct device *dev)
1166 mutex_lock(&dev->mutex);
1169 static inline int device_lock_interruptible(struct device *dev)
1171 return mutex_lock_interruptible(&dev->mutex);
1174 static inline int device_trylock(struct device *dev)
1176 return mutex_trylock(&dev->mutex);
1179 static inline void device_unlock(struct device *dev)
1181 mutex_unlock(&dev->mutex);
1184 static inline void device_lock_assert(struct device *dev)
1186 lockdep_assert_held(&dev->mutex);
1189 static inline struct device_node *dev_of_node(struct device *dev)
1191 if (!IS_ENABLED(CONFIG_OF))
1193 return dev->of_node;
1196 void driver_init(void);
1199 * High level routines for use by the bus drivers
1201 extern int __must_check device_register(struct device *dev);
1202 extern void device_unregister(struct device *dev);
1203 extern void device_initialize(struct device *dev);
1204 extern int __must_check device_add(struct device *dev);
1205 extern void device_del(struct device *dev);
1206 extern int device_for_each_child(struct device *dev, void *data,
1207 int (*fn)(struct device *dev, void *data));
1208 extern int device_for_each_child_reverse(struct device *dev, void *data,
1209 int (*fn)(struct device *dev, void *data));
1210 extern struct device *device_find_child(struct device *dev, void *data,
1211 int (*match)(struct device *dev, void *data));
1212 extern int device_rename(struct device *dev, const char *new_name);
1213 extern int device_move(struct device *dev, struct device *new_parent,
1214 enum dpm_order dpm_order);
1215 extern const char *device_get_devnode(struct device *dev,
1216 umode_t *mode, kuid_t *uid, kgid_t *gid,
1219 static inline bool device_supports_offline(struct device *dev)
1221 return dev->bus && dev->bus->offline && dev->bus->online;
1224 extern void lock_device_hotplug(void);
1225 extern void unlock_device_hotplug(void);
1226 extern int lock_device_hotplug_sysfs(void);
1227 extern int device_offline(struct device *dev);
1228 extern int device_online(struct device *dev);
1229 extern void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
1230 extern void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
1231 void device_set_of_node_from_dev(struct device *dev, const struct device *dev2);
1233 static inline int dev_num_vf(struct device *dev)
1235 if (dev->bus && dev->bus->num_vf)
1236 return dev->bus->num_vf(dev);
1241 * Root device objects for grouping under /sys/devices
1243 extern struct device *__root_device_register(const char *name,
1244 struct module *owner);
1246 /* This is a macro to avoid include problems with THIS_MODULE */
1247 #define root_device_register(name) \
1248 __root_device_register(name, THIS_MODULE)
1250 extern void root_device_unregister(struct device *root);
1252 static inline void *dev_get_platdata(const struct device *dev)
1254 return dev->platform_data;
1258 * Manual binding of a device to driver. See drivers/base/bus.c
1259 * for information on use.
1261 extern int __must_check device_bind_driver(struct device *dev);
1262 extern void device_release_driver(struct device *dev);
1263 extern int __must_check device_attach(struct device *dev);
1264 extern int __must_check driver_attach(struct device_driver *drv);
1265 extern void device_initial_probe(struct device *dev);
1266 extern int __must_check device_reprobe(struct device *dev);
1268 extern bool device_is_bound(struct device *dev);
1271 * Easy functions for dynamically creating devices on the fly
1273 extern __printf(5, 0)
1274 struct device *device_create_vargs(struct class *cls, struct device *parent,
1275 dev_t devt, void *drvdata,
1276 const char *fmt, va_list vargs);
1277 extern __printf(5, 6)
1278 struct device *device_create(struct class *cls, struct device *parent,
1279 dev_t devt, void *drvdata,
1280 const char *fmt, ...);
1281 extern __printf(6, 7)
1282 struct device *device_create_with_groups(struct class *cls,
1283 struct device *parent, dev_t devt, void *drvdata,
1284 const struct attribute_group **groups,
1285 const char *fmt, ...);
1286 extern void device_destroy(struct class *cls, dev_t devt);
1288 extern int __must_check device_add_groups(struct device *dev,
1289 const struct attribute_group **groups);
1290 extern void device_remove_groups(struct device *dev,
1291 const struct attribute_group **groups);
1293 static inline int __must_check device_add_group(struct device *dev,
1294 const struct attribute_group *grp)
1296 const struct attribute_group *groups[] = { grp, NULL };
1298 return device_add_groups(dev, groups);
1301 static inline void device_remove_group(struct device *dev,
1302 const struct attribute_group *grp)
1304 const struct attribute_group *groups[] = { grp, NULL };
1306 return device_remove_groups(dev, groups);
1309 extern int __must_check devm_device_add_groups(struct device *dev,
1310 const struct attribute_group **groups);
1311 extern void devm_device_remove_groups(struct device *dev,
1312 const struct attribute_group **groups);
1313 extern int __must_check devm_device_add_group(struct device *dev,
1314 const struct attribute_group *grp);
1315 extern void devm_device_remove_group(struct device *dev,
1316 const struct attribute_group *grp);
1319 * Platform "fixup" functions - allow the platform to have their say
1320 * about devices and actions that the general device layer doesn't
1323 /* Notify platform of device discovery */
1324 extern int (*platform_notify)(struct device *dev);
1326 extern int (*platform_notify_remove)(struct device *dev);
1330 * get_device - atomically increment the reference count for the device.
1333 extern struct device *get_device(struct device *dev);
1334 extern void put_device(struct device *dev);
1336 #ifdef CONFIG_DEVTMPFS
1337 extern int devtmpfs_create_node(struct device *dev);
1338 extern int devtmpfs_delete_node(struct device *dev);
1339 extern int devtmpfs_mount(const char *mntdir);
1341 static inline int devtmpfs_create_node(struct device *dev) { return 0; }
1342 static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
1343 static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
1346 /* drivers/base/power/shutdown.c */
1347 extern void device_shutdown(void);
1349 /* debugging and troubleshooting/diagnostic helpers. */
1350 extern const char *dev_driver_string(const struct device *dev);
1352 /* Device links interface. */
1353 struct device_link *device_link_add(struct device *consumer,
1354 struct device *supplier, u32 flags);
1355 void device_link_del(struct device_link *link);
1356 void device_link_remove(void *consumer, struct device *supplier);
1359 #define dev_fmt(fmt) fmt
1362 #ifdef CONFIG_PRINTK
1365 int dev_vprintk_emit(int level, const struct device *dev,
1366 const char *fmt, va_list args);
1368 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...);
1371 void dev_printk(const char *level, const struct device *dev,
1372 const char *fmt, ...);
1374 void _dev_emerg(const struct device *dev, const char *fmt, ...);
1376 void _dev_alert(const struct device *dev, const char *fmt, ...);
1378 void _dev_crit(const struct device *dev, const char *fmt, ...);
1380 void _dev_err(const struct device *dev, const char *fmt, ...);
1382 void _dev_warn(const struct device *dev, const char *fmt, ...);
1384 void _dev_notice(const struct device *dev, const char *fmt, ...);
1386 void _dev_info(const struct device *dev, const char *fmt, ...);
1390 static inline __printf(3, 0)
1391 int dev_vprintk_emit(int level, const struct device *dev,
1392 const char *fmt, va_list args)
1394 static inline __printf(3, 4)
1395 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
1398 static inline void __dev_printk(const char *level, const struct device *dev,
1399 struct va_format *vaf)
1401 static inline __printf(3, 4)
1402 void dev_printk(const char *level, const struct device *dev,
1403 const char *fmt, ...)
1406 static inline __printf(2, 3)
1407 void _dev_emerg(const struct device *dev, const char *fmt, ...)
1409 static inline __printf(2, 3)
1410 void _dev_crit(const struct device *dev, const char *fmt, ...)
1412 static inline __printf(2, 3)
1413 void _dev_alert(const struct device *dev, const char *fmt, ...)
1415 static inline __printf(2, 3)
1416 void _dev_err(const struct device *dev, const char *fmt, ...)
1418 static inline __printf(2, 3)
1419 void _dev_warn(const struct device *dev, const char *fmt, ...)
1421 static inline __printf(2, 3)
1422 void _dev_notice(const struct device *dev, const char *fmt, ...)
1424 static inline __printf(2, 3)
1425 void _dev_info(const struct device *dev, const char *fmt, ...)
1431 * #defines for all the dev_<level> macros to prefix with whatever
1432 * possible use of #define dev_fmt(fmt) ...
1435 #define dev_emerg(dev, fmt, ...) \
1436 _dev_emerg(dev, dev_fmt(fmt), ##__VA_ARGS__)
1437 #define dev_crit(dev, fmt, ...) \
1438 _dev_crit(dev, dev_fmt(fmt), ##__VA_ARGS__)
1439 #define dev_alert(dev, fmt, ...) \
1440 _dev_alert(dev, dev_fmt(fmt), ##__VA_ARGS__)
1441 #define dev_err(dev, fmt, ...) \
1442 _dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__)
1443 #define dev_warn(dev, fmt, ...) \
1444 _dev_warn(dev, dev_fmt(fmt), ##__VA_ARGS__)
1445 #define dev_notice(dev, fmt, ...) \
1446 _dev_notice(dev, dev_fmt(fmt), ##__VA_ARGS__)
1447 #define dev_info(dev, fmt, ...) \
1448 _dev_info(dev, dev_fmt(fmt), ##__VA_ARGS__)
1450 #if defined(CONFIG_DYNAMIC_DEBUG)
1451 #define dev_dbg(dev, fmt, ...) \
1452 dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__)
1453 #elif defined(DEBUG)
1454 #define dev_dbg(dev, fmt, ...) \
1455 dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__)
1457 #define dev_dbg(dev, fmt, ...) \
1460 dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
1464 #ifdef CONFIG_PRINTK
1465 #define dev_level_once(dev_level, dev, fmt, ...) \
1467 static bool __print_once __read_mostly; \
1469 if (!__print_once) { \
1470 __print_once = true; \
1471 dev_level(dev, fmt, ##__VA_ARGS__); \
1475 #define dev_level_once(dev_level, dev, fmt, ...) \
1478 dev_level(dev, fmt, ##__VA_ARGS__); \
1482 #define dev_emerg_once(dev, fmt, ...) \
1483 dev_level_once(dev_emerg, dev, fmt, ##__VA_ARGS__)
1484 #define dev_alert_once(dev, fmt, ...) \
1485 dev_level_once(dev_alert, dev, fmt, ##__VA_ARGS__)
1486 #define dev_crit_once(dev, fmt, ...) \
1487 dev_level_once(dev_crit, dev, fmt, ##__VA_ARGS__)
1488 #define dev_err_once(dev, fmt, ...) \
1489 dev_level_once(dev_err, dev, fmt, ##__VA_ARGS__)
1490 #define dev_warn_once(dev, fmt, ...) \
1491 dev_level_once(dev_warn, dev, fmt, ##__VA_ARGS__)
1492 #define dev_notice_once(dev, fmt, ...) \
1493 dev_level_once(dev_notice, dev, fmt, ##__VA_ARGS__)
1494 #define dev_info_once(dev, fmt, ...) \
1495 dev_level_once(dev_info, dev, fmt, ##__VA_ARGS__)
1496 #define dev_dbg_once(dev, fmt, ...) \
1497 dev_level_once(dev_dbg, dev, fmt, ##__VA_ARGS__)
1499 #define dev_level_ratelimited(dev_level, dev, fmt, ...) \
1501 static DEFINE_RATELIMIT_STATE(_rs, \
1502 DEFAULT_RATELIMIT_INTERVAL, \
1503 DEFAULT_RATELIMIT_BURST); \
1504 if (__ratelimit(&_rs)) \
1505 dev_level(dev, fmt, ##__VA_ARGS__); \
1508 #define dev_emerg_ratelimited(dev, fmt, ...) \
1509 dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__)
1510 #define dev_alert_ratelimited(dev, fmt, ...) \
1511 dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__)
1512 #define dev_crit_ratelimited(dev, fmt, ...) \
1513 dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__)
1514 #define dev_err_ratelimited(dev, fmt, ...) \
1515 dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__)
1516 #define dev_warn_ratelimited(dev, fmt, ...) \
1517 dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__)
1518 #define dev_notice_ratelimited(dev, fmt, ...) \
1519 dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
1520 #define dev_info_ratelimited(dev, fmt, ...) \
1521 dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
1522 #if defined(CONFIG_DYNAMIC_DEBUG)
1523 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
1524 #define dev_dbg_ratelimited(dev, fmt, ...) \
1526 static DEFINE_RATELIMIT_STATE(_rs, \
1527 DEFAULT_RATELIMIT_INTERVAL, \
1528 DEFAULT_RATELIMIT_BURST); \
1529 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
1530 if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) && \
1531 __ratelimit(&_rs)) \
1532 __dynamic_dev_dbg(&descriptor, dev, dev_fmt(fmt), \
1535 #elif defined(DEBUG)
1536 #define dev_dbg_ratelimited(dev, fmt, ...) \
1538 static DEFINE_RATELIMIT_STATE(_rs, \
1539 DEFAULT_RATELIMIT_INTERVAL, \
1540 DEFAULT_RATELIMIT_BURST); \
1541 if (__ratelimit(&_rs)) \
1542 dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
1545 #define dev_dbg_ratelimited(dev, fmt, ...) \
1548 dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
1552 #ifdef VERBOSE_DEBUG
1553 #define dev_vdbg dev_dbg
1555 #define dev_vdbg(dev, fmt, ...) \
1558 dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
1563 * dev_WARN*() acts like dev_printk(), but with the key difference of
1564 * using WARN/WARN_ONCE to include file/line information and a backtrace.
1566 #define dev_WARN(dev, format, arg...) \
1567 WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg);
1569 #define dev_WARN_ONCE(dev, condition, format, arg...) \
1570 WARN_ONCE(condition, "%s %s: " format, \
1571 dev_driver_string(dev), dev_name(dev), ## arg)
1573 /* Create alias, so I can be autoloaded. */
1574 #define MODULE_ALIAS_CHARDEV(major,minor) \
1575 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
1576 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
1577 MODULE_ALIAS("char-major-" __stringify(major) "-*")
1579 #ifdef CONFIG_SYSFS_DEPRECATED
1580 extern long sysfs_deprecated;
1582 #define sysfs_deprecated 0
1586 * module_driver() - Helper macro for drivers that don't do anything
1587 * special in module init/exit. This eliminates a lot of boilerplate.
1588 * Each module may only use this macro once, and calling it replaces
1589 * module_init() and module_exit().
1591 * @__driver: driver name
1592 * @__register: register function for this driver type
1593 * @__unregister: unregister function for this driver type
1594 * @...: Additional arguments to be passed to __register and __unregister.
1596 * Use this macro to construct bus specific macros for registering
1597 * drivers, and do not use it on its own.
1599 #define module_driver(__driver, __register, __unregister, ...) \
1600 static int __init __driver##_init(void) \
1602 return __register(&(__driver) , ##__VA_ARGS__); \
1604 module_init(__driver##_init); \
1605 static void __exit __driver##_exit(void) \
1607 __unregister(&(__driver) , ##__VA_ARGS__); \
1609 module_exit(__driver##_exit);
1612 * builtin_driver() - Helper macro for drivers that don't do anything
1613 * special in init and have no exit. This eliminates some boilerplate.
1614 * Each driver may only use this macro once, and calling it replaces
1615 * device_initcall (or in some cases, the legacy __initcall). This is
1616 * meant to be a direct parallel of module_driver() above but without
1617 * the __exit stuff that is not used for builtin cases.
1619 * @__driver: driver name
1620 * @__register: register function for this driver type
1621 * @...: Additional arguments to be passed to __register
1623 * Use this macro to construct bus specific macros for registering
1624 * drivers, and do not use it on its own.
1626 #define builtin_driver(__driver, __register, ...) \
1627 static int __init __driver##_init(void) \
1629 return __register(&(__driver) , ##__VA_ARGS__); \
1631 device_initcall(__driver##_init);
1633 #endif /* _DEVICE_H_ */