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 * @pm: The default device power management operations of this class.
388 * @p: The private data of the driver core, no one other than the
389 * driver core can touch this.
391 * A class is a higher-level view of a device that abstracts out low-level
392 * implementation details. Drivers may see a SCSI disk or an ATA disk, but,
393 * at the class level, they are all simply disks. Classes allow user space
394 * to work with devices based on what they do, rather than how they are
395 * connected or how they work.
399 struct module *owner;
401 const struct attribute_group **class_groups;
402 const struct attribute_group **dev_groups;
403 struct kobject *dev_kobj;
405 int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
406 char *(*devnode)(struct device *dev, umode_t *mode);
408 void (*class_release)(struct class *class);
409 void (*dev_release)(struct device *dev);
411 int (*shutdown_pre)(struct device *dev);
413 const struct kobj_ns_type_operations *ns_type;
414 const void *(*namespace)(struct device *dev);
416 const struct dev_pm_ops *pm;
418 struct subsys_private *p;
421 struct class_dev_iter {
422 struct klist_iter ki;
423 const struct device_type *type;
426 extern struct kobject *sysfs_dev_block_kobj;
427 extern struct kobject *sysfs_dev_char_kobj;
428 extern int __must_check __class_register(struct class *class,
429 struct lock_class_key *key);
430 extern void class_unregister(struct class *class);
432 /* This is a #define to keep the compiler from merging different
433 * instances of the __key variable */
434 #define class_register(class) \
436 static struct lock_class_key __key; \
437 __class_register(class, &__key); \
441 struct class_compat *class_compat_register(const char *name);
442 void class_compat_unregister(struct class_compat *cls);
443 int class_compat_create_link(struct class_compat *cls, struct device *dev,
444 struct device *device_link);
445 void class_compat_remove_link(struct class_compat *cls, struct device *dev,
446 struct device *device_link);
448 extern void class_dev_iter_init(struct class_dev_iter *iter,
450 struct device *start,
451 const struct device_type *type);
452 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
453 extern void class_dev_iter_exit(struct class_dev_iter *iter);
455 extern int class_for_each_device(struct class *class, struct device *start,
457 int (*fn)(struct device *dev, void *data));
458 extern struct device *class_find_device(struct class *class,
459 struct device *start, const void *data,
460 int (*match)(struct device *, const void *));
462 struct class_attribute {
463 struct attribute attr;
464 ssize_t (*show)(struct class *class, struct class_attribute *attr,
466 ssize_t (*store)(struct class *class, struct class_attribute *attr,
467 const char *buf, size_t count);
470 #define CLASS_ATTR_RW(_name) \
471 struct class_attribute class_attr_##_name = __ATTR_RW(_name)
472 #define CLASS_ATTR_RO(_name) \
473 struct class_attribute class_attr_##_name = __ATTR_RO(_name)
474 #define CLASS_ATTR_WO(_name) \
475 struct class_attribute class_attr_##_name = __ATTR_WO(_name)
477 extern int __must_check class_create_file_ns(struct class *class,
478 const struct class_attribute *attr,
480 extern void class_remove_file_ns(struct class *class,
481 const struct class_attribute *attr,
484 static inline int __must_check class_create_file(struct class *class,
485 const struct class_attribute *attr)
487 return class_create_file_ns(class, attr, NULL);
490 static inline void class_remove_file(struct class *class,
491 const struct class_attribute *attr)
493 return class_remove_file_ns(class, attr, NULL);
496 /* Simple class attribute that is just a static string */
497 struct class_attribute_string {
498 struct class_attribute attr;
502 /* Currently read-only only */
503 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
504 { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
505 #define CLASS_ATTR_STRING(_name, _mode, _str) \
506 struct class_attribute_string class_attr_##_name = \
507 _CLASS_ATTR_STRING(_name, _mode, _str)
509 extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
512 struct class_interface {
513 struct list_head node;
516 int (*add_dev) (struct device *, struct class_interface *);
517 void (*remove_dev) (struct device *, struct class_interface *);
520 extern int __must_check class_interface_register(struct class_interface *);
521 extern void class_interface_unregister(struct class_interface *);
523 extern struct class * __must_check __class_create(struct module *owner,
525 struct lock_class_key *key);
526 extern void class_destroy(struct class *cls);
528 /* This is a #define to keep the compiler from merging different
529 * instances of the __key variable */
530 #define class_create(owner, name) \
532 static struct lock_class_key __key; \
533 __class_create(owner, name, &__key); \
537 * The type of device, "struct device" is embedded in. A class
538 * or bus can contain devices of different types
539 * like "partitions" and "disks", "mouse" and "event".
540 * This identifies the device type and carries type-specific
541 * information, equivalent to the kobj_type of a kobject.
542 * If "name" is specified, the uevent will contain it in
543 * the DEVTYPE variable.
547 const struct attribute_group **groups;
548 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
549 char *(*devnode)(struct device *dev, umode_t *mode,
550 kuid_t *uid, kgid_t *gid);
551 void (*release)(struct device *dev);
553 const struct dev_pm_ops *pm;
556 /* interface for exporting device attributes */
557 struct device_attribute {
558 struct attribute attr;
559 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
561 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
562 const char *buf, size_t count);
565 struct dev_ext_attribute {
566 struct device_attribute attr;
570 ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
572 ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
573 const char *buf, size_t count);
574 ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
576 ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
577 const char *buf, size_t count);
578 ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
580 ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
581 const char *buf, size_t count);
583 #define DEVICE_ATTR(_name, _mode, _show, _store) \
584 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
585 #define DEVICE_ATTR_PREALLOC(_name, _mode, _show, _store) \
586 struct device_attribute dev_attr_##_name = \
587 __ATTR_PREALLOC(_name, _mode, _show, _store)
588 #define DEVICE_ATTR_RW(_name) \
589 struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
590 #define DEVICE_ATTR_RO(_name) \
591 struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
592 #define DEVICE_ATTR_WO(_name) \
593 struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
594 #define DEVICE_ULONG_ATTR(_name, _mode, _var) \
595 struct dev_ext_attribute dev_attr_##_name = \
596 { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
597 #define DEVICE_INT_ATTR(_name, _mode, _var) \
598 struct dev_ext_attribute dev_attr_##_name = \
599 { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
600 #define DEVICE_BOOL_ATTR(_name, _mode, _var) \
601 struct dev_ext_attribute dev_attr_##_name = \
602 { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
603 #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
604 struct device_attribute dev_attr_##_name = \
605 __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
607 extern int device_create_file(struct device *device,
608 const struct device_attribute *entry);
609 extern void device_remove_file(struct device *dev,
610 const struct device_attribute *attr);
611 extern bool device_remove_file_self(struct device *dev,
612 const struct device_attribute *attr);
613 extern int __must_check device_create_bin_file(struct device *dev,
614 const struct bin_attribute *attr);
615 extern void device_remove_bin_file(struct device *dev,
616 const struct bin_attribute *attr);
618 /* device resource management */
619 typedef void (*dr_release_t)(struct device *dev, void *res);
620 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
622 #ifdef CONFIG_DEBUG_DEVRES
623 extern void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
624 int nid, const char *name) __malloc;
625 #define devres_alloc(release, size, gfp) \
626 __devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release)
627 #define devres_alloc_node(release, size, gfp, nid) \
628 __devres_alloc_node(release, size, gfp, nid, #release)
630 extern void *devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
632 static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
634 return devres_alloc_node(release, size, gfp, NUMA_NO_NODE);
638 extern void devres_for_each_res(struct device *dev, dr_release_t release,
639 dr_match_t match, void *match_data,
640 void (*fn)(struct device *, void *, void *),
642 extern void devres_free(void *res);
643 extern void devres_add(struct device *dev, void *res);
644 extern void *devres_find(struct device *dev, dr_release_t release,
645 dr_match_t match, void *match_data);
646 extern void *devres_get(struct device *dev, void *new_res,
647 dr_match_t match, void *match_data);
648 extern void *devres_remove(struct device *dev, dr_release_t release,
649 dr_match_t match, void *match_data);
650 extern int devres_destroy(struct device *dev, dr_release_t release,
651 dr_match_t match, void *match_data);
652 extern int devres_release(struct device *dev, dr_release_t release,
653 dr_match_t match, void *match_data);
656 extern void * __must_check devres_open_group(struct device *dev, void *id,
658 extern void devres_close_group(struct device *dev, void *id);
659 extern void devres_remove_group(struct device *dev, void *id);
660 extern int devres_release_group(struct device *dev, void *id);
662 /* managed devm_k.alloc/kfree for device drivers */
663 extern void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
664 extern __printf(3, 0)
665 char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt,
666 va_list ap) __malloc;
667 extern __printf(3, 4)
668 char *devm_kasprintf(struct device *dev, gfp_t gfp, const char *fmt, ...) __malloc;
669 static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
671 return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
673 static inline void *devm_kmalloc_array(struct device *dev,
674 size_t n, size_t size, gfp_t flags)
678 if (unlikely(check_mul_overflow(n, size, &bytes)))
681 return devm_kmalloc(dev, bytes, flags);
683 static inline void *devm_kcalloc(struct device *dev,
684 size_t n, size_t size, gfp_t flags)
686 return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
688 extern void devm_kfree(struct device *dev, void *p);
689 extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
690 extern void *devm_kmemdup(struct device *dev, const void *src, size_t len,
693 extern unsigned long devm_get_free_pages(struct device *dev,
694 gfp_t gfp_mask, unsigned int order);
695 extern void devm_free_pages(struct device *dev, unsigned long addr);
697 void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);
699 /* allows to add/remove a custom action to devres stack */
700 int devm_add_action(struct device *dev, void (*action)(void *), void *data);
701 void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
703 static inline int devm_add_action_or_reset(struct device *dev,
704 void (*action)(void *), void *data)
708 ret = devm_add_action(dev, action, data);
716 * devm_alloc_percpu - Resource-managed alloc_percpu
717 * @dev: Device to allocate per-cpu memory for
718 * @type: Type to allocate per-cpu memory for
720 * Managed alloc_percpu. Per-cpu memory allocated with this function is
721 * automatically freed on driver detach.
724 * Pointer to allocated memory on success, NULL on failure.
726 #define devm_alloc_percpu(dev, type) \
727 ((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), \
730 void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,
732 void devm_free_percpu(struct device *dev, void __percpu *pdata);
734 struct device_dma_parameters {
736 * a low level driver may set these to teach IOMMU code about
739 unsigned int max_segment_size;
740 unsigned long segment_boundary_mask;
744 * struct device_connection - Device Connection Descriptor
745 * @endpoint: The names of the two devices connected together
746 * @id: Unique identifier for the connection
747 * @list: List head, private, for internal use only
749 struct device_connection {
750 const char *endpoint[2];
752 struct list_head list;
755 void *device_connection_find_match(struct device *dev, const char *con_id,
757 void *(*match)(struct device_connection *con,
758 int ep, void *data));
760 struct device *device_connection_find(struct device *dev, const char *con_id);
762 void device_connection_add(struct device_connection *con);
763 void device_connection_remove(struct device_connection *con);
766 * enum device_link_state - Device link states.
767 * @DL_STATE_NONE: The presence of the drivers is not being tracked.
768 * @DL_STATE_DORMANT: None of the supplier/consumer drivers is present.
769 * @DL_STATE_AVAILABLE: The supplier driver is present, but the consumer is not.
770 * @DL_STATE_CONSUMER_PROBE: The consumer is probing (supplier driver present).
771 * @DL_STATE_ACTIVE: Both the supplier and consumer drivers are present.
772 * @DL_STATE_SUPPLIER_UNBIND: The supplier driver is unbinding.
774 enum device_link_state {
776 DL_STATE_DORMANT = 0,
778 DL_STATE_CONSUMER_PROBE,
780 DL_STATE_SUPPLIER_UNBIND,
786 * STATELESS: The core won't track the presence of supplier/consumer drivers.
787 * AUTOREMOVE_CONSUMER: Remove the link automatically on consumer driver unbind.
788 * PM_RUNTIME: If set, the runtime PM framework will use this link.
789 * RPM_ACTIVE: Run pm_runtime_get_sync() on the supplier during link creation.
790 * AUTOREMOVE_SUPPLIER: Remove the link automatically on supplier driver unbind.
792 #define DL_FLAG_STATELESS BIT(0)
793 #define DL_FLAG_AUTOREMOVE_CONSUMER BIT(1)
794 #define DL_FLAG_PM_RUNTIME BIT(2)
795 #define DL_FLAG_RPM_ACTIVE BIT(3)
796 #define DL_FLAG_AUTOREMOVE_SUPPLIER BIT(4)
799 * struct device_link - Device link representation.
800 * @supplier: The device on the supplier end of the link.
801 * @s_node: Hook to the supplier device's list of links to consumers.
802 * @consumer: The device on the consumer end of the link.
803 * @c_node: Hook to the consumer device's list of links to suppliers.
804 * @status: The state of the link (with respect to the presence of drivers).
805 * @flags: Link flags.
806 * @rpm_active: Whether or not the consumer device is runtime-PM-active.
807 * @kref: Count repeated addition of the same link.
808 * @rcu_head: An RCU head to use for deferred execution of SRCU callbacks.
811 struct device *supplier;
812 struct list_head s_node;
813 struct device *consumer;
814 struct list_head c_node;
815 enum device_link_state status;
820 struct rcu_head rcu_head;
825 * enum dl_dev_state - Device driver presence tracking information.
826 * @DL_DEV_NO_DRIVER: There is no driver attached to the device.
827 * @DL_DEV_PROBING: A driver is probing.
828 * @DL_DEV_DRIVER_BOUND: The driver has been bound to the device.
829 * @DL_DEV_UNBINDING: The driver is unbinding from the device.
832 DL_DEV_NO_DRIVER = 0,
839 * struct dev_links_info - Device data related to device links.
840 * @suppliers: List of links to supplier devices.
841 * @consumers: List of links to consumer devices.
842 * @status: Driver status information.
844 struct dev_links_info {
845 struct list_head suppliers;
846 struct list_head consumers;
847 enum dl_dev_state status;
851 * struct device - The basic device structure
852 * @parent: The device's "parent" device, the device to which it is attached.
853 * In most cases, a parent device is some sort of bus or host
854 * controller. If parent is NULL, the device, is a top-level device,
855 * which is not usually what you want.
856 * @p: Holds the private data of the driver core portions of the device.
857 * See the comment of the struct device_private for detail.
858 * @kobj: A top-level, abstract class from which other classes are derived.
859 * @init_name: Initial name of the device.
860 * @type: The type of device.
861 * This identifies the device type and carries type-specific
863 * @mutex: Mutex to synchronize calls to its driver.
864 * @bus: Type of bus device is on.
865 * @driver: Which driver has allocated this
866 * @platform_data: Platform data specific to the device.
867 * Example: For devices on custom boards, as typical of embedded
868 * and SOC based hardware, Linux often uses platform_data to point
869 * to board-specific structures describing devices and how they
870 * are wired. That can include what ports are available, chip
871 * variants, which GPIO pins act in what additional roles, and so
872 * on. This shrinks the "Board Support Packages" (BSPs) and
873 * minimizes board-specific #ifdefs in drivers.
874 * @driver_data: Private pointer for driver specific info.
875 * @links: Links to suppliers and consumers of this device.
876 * @power: For device power management.
877 * See Documentation/driver-api/pm/devices.rst for details.
878 * @pm_domain: Provide callbacks that are executed during system suspend,
879 * hibernation, system resume and during runtime PM transitions
880 * along with subsystem-level and driver-level callbacks.
881 * @pins: For device pin management.
882 * See Documentation/driver-api/pinctl.rst for details.
883 * @msi_list: Hosts MSI descriptors
884 * @msi_domain: The generic MSI domain this device is using.
885 * @numa_node: NUMA node this device is close to.
886 * @dma_ops: DMA mapping operations for this device.
887 * @dma_mask: Dma mask (if dma'ble device).
888 * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
889 * hardware supports 64-bit addresses for consistent allocations
891 * @bus_dma_mask: Mask of an upstream bridge or bus which imposes a smaller DMA
892 * limit than the device itself supports.
893 * @dma_pfn_offset: offset of DMA memory range relatively of RAM
894 * @dma_parms: A low level driver may set these to teach IOMMU code about
895 * segment limitations.
896 * @dma_pools: Dma pools (if dma'ble device).
897 * @dma_mem: Internal for coherent mem override.
898 * @cma_area: Contiguous memory area for dma allocations
899 * @archdata: For arch-specific additions.
900 * @of_node: Associated device tree node.
901 * @fwnode: Associated device node supplied by platform firmware.
902 * @devt: For creating the sysfs "dev".
903 * @id: device instance
904 * @devres_lock: Spinlock to protect the resource of the device.
905 * @devres_head: The resources list of the device.
906 * @knode_class: The node used to add the device to the class list.
907 * @class: The class of the device.
908 * @groups: Optional attribute groups.
909 * @release: Callback to free the device after all references have
910 * gone away. This should be set by the allocator of the
911 * device (i.e. the bus driver that discovered the device).
912 * @iommu_group: IOMMU group the device belongs to.
913 * @iommu_fwspec: IOMMU-specific properties supplied by firmware.
915 * @offline_disabled: If set, the device is permanently online.
916 * @offline: Set after successful invocation of bus type's .offline().
917 * @of_node_reused: Set if the device-tree node is shared with an ancestor
920 * At the lowest level, every device in a Linux system is represented by an
921 * instance of struct device. The device structure contains the information
922 * that the device model core needs to model the system. Most subsystems,
923 * however, track additional information about the devices they host. As a
924 * result, it is rare for devices to be represented by bare device structures;
925 * instead, that structure, like kobject structures, is usually embedded within
926 * a higher-level representation of the device.
929 struct device *parent;
931 struct device_private *p;
934 const char *init_name; /* initial name of the device */
935 const struct device_type *type;
937 struct mutex mutex; /* mutex to synchronize calls to
941 struct bus_type *bus; /* type of bus device is on */
942 struct device_driver *driver; /* which driver has allocated this
944 void *platform_data; /* Platform specific data, device
945 core doesn't touch it */
946 void *driver_data; /* Driver data, set and get with
947 dev_set/get_drvdata */
948 struct dev_links_info links;
949 struct dev_pm_info power;
950 struct dev_pm_domain *pm_domain;
952 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
953 struct irq_domain *msi_domain;
955 #ifdef CONFIG_PINCTRL
956 struct dev_pin_info *pins;
958 #ifdef CONFIG_GENERIC_MSI_IRQ
959 struct list_head msi_list;
963 int numa_node; /* NUMA node this device is close to */
965 const struct dma_map_ops *dma_ops;
966 u64 *dma_mask; /* dma mask (if dma'able device) */
967 u64 coherent_dma_mask;/* Like dma_mask, but for
968 alloc_coherent mappings as
969 not all hardware supports
970 64 bit addresses for consistent
971 allocations such descriptors. */
972 u64 bus_dma_mask; /* upstream dma_mask constraint */
973 unsigned long dma_pfn_offset;
975 struct device_dma_parameters *dma_parms;
977 struct list_head dma_pools; /* dma pools (if dma'ble) */
979 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
981 #ifdef CONFIG_DMA_CMA
982 struct cma *cma_area; /* contiguous memory area for dma
985 /* arch specific additions */
986 struct dev_archdata archdata;
988 struct device_node *of_node; /* associated device tree node */
989 struct fwnode_handle *fwnode; /* firmware device node */
991 dev_t devt; /* dev_t, creates the sysfs "dev" */
992 u32 id; /* device instance */
994 spinlock_t devres_lock;
995 struct list_head devres_head;
997 struct klist_node knode_class;
999 const struct attribute_group **groups; /* optional groups */
1001 void (*release)(struct device *dev);
1002 struct iommu_group *iommu_group;
1003 struct iommu_fwspec *iommu_fwspec;
1005 bool offline_disabled:1;
1007 bool of_node_reused:1;
1010 static inline struct device *kobj_to_dev(struct kobject *kobj)
1012 return container_of(kobj, struct device, kobj);
1015 /* Get the wakeup routines, which depend on struct device */
1016 #include <linux/pm_wakeup.h>
1018 static inline const char *dev_name(const struct device *dev)
1020 /* Use the init name until the kobject becomes available */
1022 return dev->init_name;
1024 return kobject_name(&dev->kobj);
1027 extern __printf(2, 3)
1028 int dev_set_name(struct device *dev, const char *name, ...);
1031 static inline int dev_to_node(struct device *dev)
1033 return dev->numa_node;
1035 static inline void set_dev_node(struct device *dev, int node)
1037 dev->numa_node = node;
1040 static inline int dev_to_node(struct device *dev)
1044 static inline void set_dev_node(struct device *dev, int node)
1049 static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
1051 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
1052 return dev->msi_domain;
1058 static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d)
1060 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
1061 dev->msi_domain = d;
1065 static inline void *dev_get_drvdata(const struct device *dev)
1067 return dev->driver_data;
1070 static inline void dev_set_drvdata(struct device *dev, void *data)
1072 dev->driver_data = data;
1075 static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
1077 return dev ? dev->power.subsys_data : NULL;
1080 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
1082 return dev->kobj.uevent_suppress;
1085 static inline void dev_set_uevent_suppress(struct device *dev, int val)
1087 dev->kobj.uevent_suppress = val;
1090 static inline int device_is_registered(struct device *dev)
1092 return dev->kobj.state_in_sysfs;
1095 static inline void device_enable_async_suspend(struct device *dev)
1097 if (!dev->power.is_prepared)
1098 dev->power.async_suspend = true;
1101 static inline void device_disable_async_suspend(struct device *dev)
1103 if (!dev->power.is_prepared)
1104 dev->power.async_suspend = false;
1107 static inline bool device_async_suspend_enabled(struct device *dev)
1109 return !!dev->power.async_suspend;
1112 static inline void dev_pm_syscore_device(struct device *dev, bool val)
1114 #ifdef CONFIG_PM_SLEEP
1115 dev->power.syscore = val;
1119 static inline void dev_pm_set_driver_flags(struct device *dev, u32 flags)
1121 dev->power.driver_flags = flags;
1124 static inline bool dev_pm_test_driver_flags(struct device *dev, u32 flags)
1126 return !!(dev->power.driver_flags & flags);
1129 static inline void device_lock(struct device *dev)
1131 mutex_lock(&dev->mutex);
1134 static inline int device_lock_interruptible(struct device *dev)
1136 return mutex_lock_interruptible(&dev->mutex);
1139 static inline int device_trylock(struct device *dev)
1141 return mutex_trylock(&dev->mutex);
1144 static inline void device_unlock(struct device *dev)
1146 mutex_unlock(&dev->mutex);
1149 static inline void device_lock_assert(struct device *dev)
1151 lockdep_assert_held(&dev->mutex);
1154 static inline struct device_node *dev_of_node(struct device *dev)
1156 if (!IS_ENABLED(CONFIG_OF))
1158 return dev->of_node;
1161 void driver_init(void);
1164 * High level routines for use by the bus drivers
1166 extern int __must_check device_register(struct device *dev);
1167 extern void device_unregister(struct device *dev);
1168 extern void device_initialize(struct device *dev);
1169 extern int __must_check device_add(struct device *dev);
1170 extern void device_del(struct device *dev);
1171 extern int device_for_each_child(struct device *dev, void *data,
1172 int (*fn)(struct device *dev, void *data));
1173 extern int device_for_each_child_reverse(struct device *dev, void *data,
1174 int (*fn)(struct device *dev, void *data));
1175 extern struct device *device_find_child(struct device *dev, void *data,
1176 int (*match)(struct device *dev, void *data));
1177 extern int device_rename(struct device *dev, const char *new_name);
1178 extern int device_move(struct device *dev, struct device *new_parent,
1179 enum dpm_order dpm_order);
1180 extern const char *device_get_devnode(struct device *dev,
1181 umode_t *mode, kuid_t *uid, kgid_t *gid,
1184 static inline bool device_supports_offline(struct device *dev)
1186 return dev->bus && dev->bus->offline && dev->bus->online;
1189 extern void lock_device_hotplug(void);
1190 extern void unlock_device_hotplug(void);
1191 extern int lock_device_hotplug_sysfs(void);
1192 extern int device_offline(struct device *dev);
1193 extern int device_online(struct device *dev);
1194 extern void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
1195 extern void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
1196 void device_set_of_node_from_dev(struct device *dev, const struct device *dev2);
1198 static inline int dev_num_vf(struct device *dev)
1200 if (dev->bus && dev->bus->num_vf)
1201 return dev->bus->num_vf(dev);
1206 * Root device objects for grouping under /sys/devices
1208 extern struct device *__root_device_register(const char *name,
1209 struct module *owner);
1211 /* This is a macro to avoid include problems with THIS_MODULE */
1212 #define root_device_register(name) \
1213 __root_device_register(name, THIS_MODULE)
1215 extern void root_device_unregister(struct device *root);
1217 static inline void *dev_get_platdata(const struct device *dev)
1219 return dev->platform_data;
1223 * Manual binding of a device to driver. See drivers/base/bus.c
1224 * for information on use.
1226 extern int __must_check device_bind_driver(struct device *dev);
1227 extern void device_release_driver(struct device *dev);
1228 extern int __must_check device_attach(struct device *dev);
1229 extern int __must_check driver_attach(struct device_driver *drv);
1230 extern void device_initial_probe(struct device *dev);
1231 extern int __must_check device_reprobe(struct device *dev);
1233 extern bool device_is_bound(struct device *dev);
1236 * Easy functions for dynamically creating devices on the fly
1238 extern __printf(5, 0)
1239 struct device *device_create_vargs(struct class *cls, struct device *parent,
1240 dev_t devt, void *drvdata,
1241 const char *fmt, va_list vargs);
1242 extern __printf(5, 6)
1243 struct device *device_create(struct class *cls, struct device *parent,
1244 dev_t devt, void *drvdata,
1245 const char *fmt, ...);
1246 extern __printf(6, 7)
1247 struct device *device_create_with_groups(struct class *cls,
1248 struct device *parent, dev_t devt, void *drvdata,
1249 const struct attribute_group **groups,
1250 const char *fmt, ...);
1251 extern void device_destroy(struct class *cls, dev_t devt);
1253 extern int __must_check device_add_groups(struct device *dev,
1254 const struct attribute_group **groups);
1255 extern void device_remove_groups(struct device *dev,
1256 const struct attribute_group **groups);
1258 static inline int __must_check device_add_group(struct device *dev,
1259 const struct attribute_group *grp)
1261 const struct attribute_group *groups[] = { grp, NULL };
1263 return device_add_groups(dev, groups);
1266 static inline void device_remove_group(struct device *dev,
1267 const struct attribute_group *grp)
1269 const struct attribute_group *groups[] = { grp, NULL };
1271 return device_remove_groups(dev, groups);
1274 extern int __must_check devm_device_add_groups(struct device *dev,
1275 const struct attribute_group **groups);
1276 extern void devm_device_remove_groups(struct device *dev,
1277 const struct attribute_group **groups);
1278 extern int __must_check devm_device_add_group(struct device *dev,
1279 const struct attribute_group *grp);
1280 extern void devm_device_remove_group(struct device *dev,
1281 const struct attribute_group *grp);
1284 * Platform "fixup" functions - allow the platform to have their say
1285 * about devices and actions that the general device layer doesn't
1288 /* Notify platform of device discovery */
1289 extern int (*platform_notify)(struct device *dev);
1291 extern int (*platform_notify_remove)(struct device *dev);
1295 * get_device - atomically increment the reference count for the device.
1298 extern struct device *get_device(struct device *dev);
1299 extern void put_device(struct device *dev);
1301 #ifdef CONFIG_DEVTMPFS
1302 extern int devtmpfs_create_node(struct device *dev);
1303 extern int devtmpfs_delete_node(struct device *dev);
1304 extern int devtmpfs_mount(const char *mntdir);
1306 static inline int devtmpfs_create_node(struct device *dev) { return 0; }
1307 static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
1308 static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
1311 /* drivers/base/power/shutdown.c */
1312 extern void device_shutdown(void);
1314 /* debugging and troubleshooting/diagnostic helpers. */
1315 extern const char *dev_driver_string(const struct device *dev);
1317 /* Device links interface. */
1318 struct device_link *device_link_add(struct device *consumer,
1319 struct device *supplier, u32 flags);
1320 void device_link_del(struct device_link *link);
1321 void device_link_remove(void *consumer, struct device *supplier);
1323 #ifdef CONFIG_PRINTK
1325 extern __printf(3, 0)
1326 int dev_vprintk_emit(int level, const struct device *dev,
1327 const char *fmt, va_list args);
1328 extern __printf(3, 4)
1329 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...);
1331 extern __printf(3, 4)
1332 void dev_printk(const char *level, const struct device *dev,
1333 const char *fmt, ...);
1334 extern __printf(2, 3)
1335 void dev_emerg(const struct device *dev, const char *fmt, ...);
1336 extern __printf(2, 3)
1337 void dev_alert(const struct device *dev, const char *fmt, ...);
1338 extern __printf(2, 3)
1339 void dev_crit(const struct device *dev, const char *fmt, ...);
1340 extern __printf(2, 3)
1341 void dev_err(const struct device *dev, const char *fmt, ...);
1342 extern __printf(2, 3)
1343 void dev_warn(const struct device *dev, const char *fmt, ...);
1344 extern __printf(2, 3)
1345 void dev_notice(const struct device *dev, const char *fmt, ...);
1346 extern __printf(2, 3)
1347 void _dev_info(const struct device *dev, const char *fmt, ...);
1351 static inline __printf(3, 0)
1352 int dev_vprintk_emit(int level, const struct device *dev,
1353 const char *fmt, va_list args)
1355 static inline __printf(3, 4)
1356 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
1359 static inline void __dev_printk(const char *level, const struct device *dev,
1360 struct va_format *vaf)
1362 static inline __printf(3, 4)
1363 void dev_printk(const char *level, const struct device *dev,
1364 const char *fmt, ...)
1367 static inline __printf(2, 3)
1368 void dev_emerg(const struct device *dev, const char *fmt, ...)
1370 static inline __printf(2, 3)
1371 void dev_crit(const struct device *dev, const char *fmt, ...)
1373 static inline __printf(2, 3)
1374 void dev_alert(const struct device *dev, const char *fmt, ...)
1376 static inline __printf(2, 3)
1377 void dev_err(const struct device *dev, const char *fmt, ...)
1379 static inline __printf(2, 3)
1380 void dev_warn(const struct device *dev, const char *fmt, ...)
1382 static inline __printf(2, 3)
1383 void dev_notice(const struct device *dev, const char *fmt, ...)
1385 static inline __printf(2, 3)
1386 void _dev_info(const struct device *dev, const char *fmt, ...)
1392 * Stupid hackaround for existing uses of non-printk uses dev_info
1394 * Note that the definition of dev_info below is actually _dev_info
1395 * and a macro is used to avoid redefining dev_info
1398 #define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)
1400 #if defined(CONFIG_DYNAMIC_DEBUG)
1401 #define dev_dbg(dev, format, ...) \
1403 dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
1405 #elif defined(DEBUG)
1406 #define dev_dbg(dev, format, arg...) \
1407 dev_printk(KERN_DEBUG, dev, format, ##arg)
1409 #define dev_dbg(dev, format, arg...) \
1412 dev_printk(KERN_DEBUG, dev, format, ##arg); \
1416 #ifdef CONFIG_PRINTK
1417 #define dev_level_once(dev_level, dev, fmt, ...) \
1419 static bool __print_once __read_mostly; \
1421 if (!__print_once) { \
1422 __print_once = true; \
1423 dev_level(dev, fmt, ##__VA_ARGS__); \
1427 #define dev_level_once(dev_level, dev, fmt, ...) \
1430 dev_level(dev, fmt, ##__VA_ARGS__); \
1434 #define dev_emerg_once(dev, fmt, ...) \
1435 dev_level_once(dev_emerg, dev, fmt, ##__VA_ARGS__)
1436 #define dev_alert_once(dev, fmt, ...) \
1437 dev_level_once(dev_alert, dev, fmt, ##__VA_ARGS__)
1438 #define dev_crit_once(dev, fmt, ...) \
1439 dev_level_once(dev_crit, dev, fmt, ##__VA_ARGS__)
1440 #define dev_err_once(dev, fmt, ...) \
1441 dev_level_once(dev_err, dev, fmt, ##__VA_ARGS__)
1442 #define dev_warn_once(dev, fmt, ...) \
1443 dev_level_once(dev_warn, dev, fmt, ##__VA_ARGS__)
1444 #define dev_notice_once(dev, fmt, ...) \
1445 dev_level_once(dev_notice, dev, fmt, ##__VA_ARGS__)
1446 #define dev_info_once(dev, fmt, ...) \
1447 dev_level_once(dev_info, dev, fmt, ##__VA_ARGS__)
1448 #define dev_dbg_once(dev, fmt, ...) \
1449 dev_level_once(dev_dbg, dev, fmt, ##__VA_ARGS__)
1451 #define dev_level_ratelimited(dev_level, dev, fmt, ...) \
1453 static DEFINE_RATELIMIT_STATE(_rs, \
1454 DEFAULT_RATELIMIT_INTERVAL, \
1455 DEFAULT_RATELIMIT_BURST); \
1456 if (__ratelimit(&_rs)) \
1457 dev_level(dev, fmt, ##__VA_ARGS__); \
1460 #define dev_emerg_ratelimited(dev, fmt, ...) \
1461 dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__)
1462 #define dev_alert_ratelimited(dev, fmt, ...) \
1463 dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__)
1464 #define dev_crit_ratelimited(dev, fmt, ...) \
1465 dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__)
1466 #define dev_err_ratelimited(dev, fmt, ...) \
1467 dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__)
1468 #define dev_warn_ratelimited(dev, fmt, ...) \
1469 dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__)
1470 #define dev_notice_ratelimited(dev, fmt, ...) \
1471 dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
1472 #define dev_info_ratelimited(dev, fmt, ...) \
1473 dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
1474 #if defined(CONFIG_DYNAMIC_DEBUG)
1475 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
1476 #define dev_dbg_ratelimited(dev, fmt, ...) \
1478 static DEFINE_RATELIMIT_STATE(_rs, \
1479 DEFAULT_RATELIMIT_INTERVAL, \
1480 DEFAULT_RATELIMIT_BURST); \
1481 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
1482 if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) && \
1483 __ratelimit(&_rs)) \
1484 __dynamic_dev_dbg(&descriptor, dev, fmt, \
1487 #elif defined(DEBUG)
1488 #define dev_dbg_ratelimited(dev, fmt, ...) \
1490 static DEFINE_RATELIMIT_STATE(_rs, \
1491 DEFAULT_RATELIMIT_INTERVAL, \
1492 DEFAULT_RATELIMIT_BURST); \
1493 if (__ratelimit(&_rs)) \
1494 dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \
1497 #define dev_dbg_ratelimited(dev, fmt, ...) \
1500 dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \
1504 #ifdef VERBOSE_DEBUG
1505 #define dev_vdbg dev_dbg
1507 #define dev_vdbg(dev, format, arg...) \
1510 dev_printk(KERN_DEBUG, dev, format, ##arg); \
1515 * dev_WARN*() acts like dev_printk(), but with the key difference of
1516 * using WARN/WARN_ONCE to include file/line information and a backtrace.
1518 #define dev_WARN(dev, format, arg...) \
1519 WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg);
1521 #define dev_WARN_ONCE(dev, condition, format, arg...) \
1522 WARN_ONCE(condition, "%s %s: " format, \
1523 dev_driver_string(dev), dev_name(dev), ## arg)
1525 /* Create alias, so I can be autoloaded. */
1526 #define MODULE_ALIAS_CHARDEV(major,minor) \
1527 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
1528 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
1529 MODULE_ALIAS("char-major-" __stringify(major) "-*")
1531 #ifdef CONFIG_SYSFS_DEPRECATED
1532 extern long sysfs_deprecated;
1534 #define sysfs_deprecated 0
1538 * module_driver() - Helper macro for drivers that don't do anything
1539 * special in module init/exit. This eliminates a lot of boilerplate.
1540 * Each module may only use this macro once, and calling it replaces
1541 * module_init() and module_exit().
1543 * @__driver: driver name
1544 * @__register: register function for this driver type
1545 * @__unregister: unregister function for this driver type
1546 * @...: Additional arguments to be passed to __register and __unregister.
1548 * Use this macro to construct bus specific macros for registering
1549 * drivers, and do not use it on its own.
1551 #define module_driver(__driver, __register, __unregister, ...) \
1552 static int __init __driver##_init(void) \
1554 return __register(&(__driver) , ##__VA_ARGS__); \
1556 module_init(__driver##_init); \
1557 static void __exit __driver##_exit(void) \
1559 __unregister(&(__driver) , ##__VA_ARGS__); \
1561 module_exit(__driver##_exit);
1564 * builtin_driver() - Helper macro for drivers that don't do anything
1565 * special in init and have no exit. This eliminates some boilerplate.
1566 * Each driver may only use this macro once, and calling it replaces
1567 * device_initcall (or in some cases, the legacy __initcall). This is
1568 * meant to be a direct parallel of module_driver() above but without
1569 * the __exit stuff that is not used for builtin cases.
1571 * @__driver: driver name
1572 * @__register: register function for this driver type
1573 * @...: Additional arguments to be passed to __register
1575 * Use this macro to construct bus specific macros for registering
1576 * drivers, and do not use it on its own.
1578 #define builtin_driver(__driver, __register, ...) \
1579 static int __init __driver##_init(void) \
1581 return __register(&(__driver) , ##__VA_ARGS__); \
1583 device_initcall(__driver##_init);
1585 #endif /* _DEVICE_H_ */