2 * device.h - generic, centralized driver model
4 * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
5 * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de>
6 * Copyright (c) 2008-2009 Novell Inc.
8 * This file is released under the GPLv2
10 * See Documentation/driver-model/ for more information.
16 #include <linux/ioport.h>
17 #include <linux/kobject.h>
18 #include <linux/klist.h>
19 #include <linux/list.h>
20 #include <linux/lockdep.h>
21 #include <linux/compiler.h>
22 #include <linux/types.h>
23 #include <linux/mutex.h>
24 #include <linux/pinctrl/devinfo.h>
26 #include <linux/atomic.h>
27 #include <linux/ratelimit.h>
28 #include <linux/uidgid.h>
29 #include <linux/gfp.h>
30 #include <asm/device.h>
33 struct device_private;
35 struct driver_private;
38 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 * @pm: Power management operations of this bus, callback the specific
93 * device driver's pm-ops.
94 * @iommu_ops: IOMMU specific operations for this bus, used to attach IOMMU
95 * driver implementations to a bus and allow the driver to do
97 * @p: The private data of the driver core, only the driver core can
99 * @lock_key: Lock class key for use by the lock validator
101 * A bus is a channel between the processor and one or more devices. For the
102 * purposes of the device model, all devices are connected via a bus, even if
103 * it is an internal, virtual, "platform" bus. Buses can plug into each other.
104 * A USB controller is usually a PCI device, for example. The device model
105 * represents the actual connections between buses and the devices they control.
106 * A bus is represented by the bus_type structure. It contains the name, the
107 * default attributes, the bus' methods, PM operations, and the driver core's
112 const char *dev_name;
113 struct device *dev_root;
114 const struct attribute_group **bus_groups;
115 const struct attribute_group **dev_groups;
116 const struct attribute_group **drv_groups;
118 int (*match)(struct device *dev, struct device_driver *drv);
119 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
120 int (*probe)(struct device *dev);
121 int (*remove)(struct device *dev);
122 void (*shutdown)(struct device *dev);
124 int (*online)(struct device *dev);
125 int (*offline)(struct device *dev);
127 int (*suspend)(struct device *dev, pm_message_t state);
128 int (*resume)(struct device *dev);
130 int (*num_vf)(struct device *dev);
132 const struct dev_pm_ops *pm;
134 const struct iommu_ops *iommu_ops;
136 struct subsys_private *p;
137 struct lock_class_key lock_key;
140 extern int __must_check bus_register(struct bus_type *bus);
142 extern void bus_unregister(struct bus_type *bus);
144 extern int __must_check bus_rescan_devices(struct bus_type *bus);
146 /* iterator helpers for buses */
147 struct subsys_dev_iter {
148 struct klist_iter ki;
149 const struct device_type *type;
151 void subsys_dev_iter_init(struct subsys_dev_iter *iter,
152 struct bus_type *subsys,
153 struct device *start,
154 const struct device_type *type);
155 struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter);
156 void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
158 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
159 int (*fn)(struct device *dev, void *data));
160 struct device *bus_find_device(struct bus_type *bus, struct device *start,
162 int (*match)(struct device *dev, void *data));
163 struct device *bus_find_device_by_name(struct bus_type *bus,
164 struct device *start,
166 struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id,
167 struct device *hint);
168 int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
169 void *data, int (*fn)(struct device_driver *, void *));
170 void bus_sort_breadthfirst(struct bus_type *bus,
171 int (*compare)(const struct device *a,
172 const struct device *b));
174 * Bus notifiers: Get notified of addition/removal of devices
175 * and binding/unbinding of drivers to devices.
176 * In the long run, it should be a replacement for the platform
179 struct notifier_block;
181 extern int bus_register_notifier(struct bus_type *bus,
182 struct notifier_block *nb);
183 extern int bus_unregister_notifier(struct bus_type *bus,
184 struct notifier_block *nb);
186 /* All 4 notifers below get called with the target struct device *
187 * as an argument. Note that those functions are likely to be called
188 * with the device lock held in the core, so be careful.
190 #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
191 #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device to be removed */
192 #define BUS_NOTIFY_REMOVED_DEVICE 0x00000003 /* device removed */
193 #define BUS_NOTIFY_BIND_DRIVER 0x00000004 /* driver about to be
195 #define BUS_NOTIFY_BOUND_DRIVER 0x00000005 /* driver bound to device */
196 #define BUS_NOTIFY_UNBIND_DRIVER 0x00000006 /* driver about to be
198 #define BUS_NOTIFY_UNBOUND_DRIVER 0x00000007 /* driver is unbound
200 #define BUS_NOTIFY_DRIVER_NOT_BOUND 0x00000008 /* driver fails to be bound */
202 extern struct kset *bus_get_kset(struct bus_type *bus);
203 extern struct klist *bus_get_device_klist(struct bus_type *bus);
206 * enum probe_type - device driver probe type to try
207 * Device drivers may opt in for special handling of their
208 * respective probe routines. This tells the core what to
211 * @PROBE_DEFAULT_STRATEGY: Used by drivers that work equally well
212 * whether probed synchronously or asynchronously.
213 * @PROBE_PREFER_ASYNCHRONOUS: Drivers for "slow" devices which
214 * probing order is not essential for booting the system may
215 * opt into executing their probes asynchronously.
216 * @PROBE_FORCE_SYNCHRONOUS: Use this to annotate drivers that need
217 * their probe routines to run synchronously with driver and
218 * device registration (with the exception of -EPROBE_DEFER
219 * handling - re-probing always ends up being done asynchronously).
221 * Note that the end goal is to switch the kernel to use asynchronous
222 * probing by default, so annotating drivers with
223 * %PROBE_PREFER_ASYNCHRONOUS is a temporary measure that allows us
224 * to speed up boot process while we are validating the rest of the
228 PROBE_DEFAULT_STRATEGY,
229 PROBE_PREFER_ASYNCHRONOUS,
230 PROBE_FORCE_SYNCHRONOUS,
234 * struct device_driver - The basic device driver structure
235 * @name: Name of the device driver.
236 * @bus: The bus which the device of this driver belongs to.
237 * @owner: The module owner.
238 * @mod_name: Used for built-in modules.
239 * @suppress_bind_attrs: Disables bind/unbind via sysfs.
240 * @probe_type: Type of the probe (synchronous or asynchronous) to use.
241 * @of_match_table: The open firmware table.
242 * @acpi_match_table: The ACPI match table.
243 * @probe: Called to query the existence of a specific device,
244 * whether this driver can work with it, and bind the driver
245 * to a specific device.
246 * @remove: Called when the device is removed from the system to
247 * unbind a device from this driver.
248 * @shutdown: Called at shut-down time to quiesce the device.
249 * @suspend: Called to put the device to sleep mode. Usually to a
251 * @resume: Called to bring a device from sleep mode.
252 * @groups: Default attributes that get created by the driver core
254 * @pm: Power management operations of the device which matched
256 * @p: Driver core's private data, no one other than the driver
257 * core can touch this.
259 * The device driver-model tracks all of the drivers known to the system.
260 * The main reason for this tracking is to enable the driver core to match
261 * up drivers with new devices. Once drivers are known objects within the
262 * system, however, a number of other things become possible. Device drivers
263 * can export information and configuration variables that are independent
264 * of any specific device.
266 struct device_driver {
268 struct bus_type *bus;
270 struct module *owner;
271 const char *mod_name; /* used for built-in modules */
273 bool suppress_bind_attrs; /* disables bind/unbind via sysfs */
274 enum probe_type probe_type;
276 const struct of_device_id *of_match_table;
277 const struct acpi_device_id *acpi_match_table;
279 int (*probe) (struct device *dev);
280 int (*remove) (struct device *dev);
281 void (*shutdown) (struct device *dev);
282 int (*suspend) (struct device *dev, pm_message_t state);
283 int (*resume) (struct device *dev);
284 const struct attribute_group **groups;
286 const struct dev_pm_ops *pm;
288 struct driver_private *p;
292 extern int __must_check driver_register(struct device_driver *drv);
293 extern void driver_unregister(struct device_driver *drv);
295 extern struct device_driver *driver_find(const char *name,
296 struct bus_type *bus);
297 extern int driver_probe_done(void);
298 extern void wait_for_device_probe(void);
301 /* sysfs interface for exporting driver attributes */
303 struct driver_attribute {
304 struct attribute attr;
305 ssize_t (*show)(struct device_driver *driver, char *buf);
306 ssize_t (*store)(struct device_driver *driver, const char *buf,
310 #define DRIVER_ATTR_RW(_name) \
311 struct driver_attribute driver_attr_##_name = __ATTR_RW(_name)
312 #define DRIVER_ATTR_RO(_name) \
313 struct driver_attribute driver_attr_##_name = __ATTR_RO(_name)
314 #define DRIVER_ATTR_WO(_name) \
315 struct driver_attribute driver_attr_##_name = __ATTR_WO(_name)
317 extern int __must_check driver_create_file(struct device_driver *driver,
318 const struct driver_attribute *attr);
319 extern void driver_remove_file(struct device_driver *driver,
320 const struct driver_attribute *attr);
322 extern int __must_check driver_for_each_device(struct device_driver *drv,
323 struct device *start,
325 int (*fn)(struct device *dev,
327 struct device *driver_find_device(struct device_driver *drv,
328 struct device *start, void *data,
329 int (*match)(struct device *dev, void *data));
332 * struct subsys_interface - interfaces to device functions
333 * @name: name of the device function
334 * @subsys: subsytem of the devices to attach to
335 * @node: the list of functions registered at the subsystem
336 * @add_dev: device hookup to device function handler
337 * @remove_dev: device hookup to device function handler
339 * Simple interfaces attached to a subsystem. Multiple interfaces can
340 * attach to a subsystem and its devices. Unlike drivers, they do not
341 * exclusively claim or control devices. Interfaces usually represent
342 * a specific functionality of a subsystem/class of devices.
344 struct subsys_interface {
346 struct bus_type *subsys;
347 struct list_head node;
348 int (*add_dev)(struct device *dev, struct subsys_interface *sif);
349 void (*remove_dev)(struct device *dev, struct subsys_interface *sif);
352 int subsys_interface_register(struct subsys_interface *sif);
353 void subsys_interface_unregister(struct subsys_interface *sif);
355 int subsys_system_register(struct bus_type *subsys,
356 const struct attribute_group **groups);
357 int subsys_virtual_register(struct bus_type *subsys,
358 const struct attribute_group **groups);
361 * struct class - device classes
362 * @name: Name of the class.
363 * @owner: The module owner.
364 * @class_groups: Default attributes of this class.
365 * @dev_groups: Default attributes of the devices that belong to the class.
366 * @dev_kobj: The kobject that represents this class and links it into the hierarchy.
367 * @dev_uevent: Called when a device is added, removed from this class, or a
368 * few other things that generate uevents to add the environment
370 * @devnode: Callback to provide the devtmpfs.
371 * @class_release: Called to release this class.
372 * @dev_release: Called to release the device.
373 * @shutdown_pre: Called at shut-down time before driver shutdown.
374 * @ns_type: Callbacks so sysfs can detemine namespaces.
375 * @namespace: Namespace of the device belongs to this class.
376 * @pm: The default device power management operations of this class.
377 * @p: The private data of the driver core, no one other than the
378 * driver core can touch this.
380 * A class is a higher-level view of a device that abstracts out low-level
381 * implementation details. Drivers may see a SCSI disk or an ATA disk, but,
382 * at the class level, they are all simply disks. Classes allow user space
383 * to work with devices based on what they do, rather than how they are
384 * connected or how they work.
388 struct module *owner;
390 const struct attribute_group **class_groups;
391 const struct attribute_group **dev_groups;
392 struct kobject *dev_kobj;
394 int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
395 char *(*devnode)(struct device *dev, umode_t *mode);
397 void (*class_release)(struct class *class);
398 void (*dev_release)(struct device *dev);
400 int (*shutdown_pre)(struct device *dev);
402 const struct kobj_ns_type_operations *ns_type;
403 const void *(*namespace)(struct device *dev);
405 const struct dev_pm_ops *pm;
407 struct subsys_private *p;
410 struct class_dev_iter {
411 struct klist_iter ki;
412 const struct device_type *type;
415 extern struct kobject *sysfs_dev_block_kobj;
416 extern struct kobject *sysfs_dev_char_kobj;
417 extern int __must_check __class_register(struct class *class,
418 struct lock_class_key *key);
419 extern void class_unregister(struct class *class);
421 /* This is a #define to keep the compiler from merging different
422 * instances of the __key variable */
423 #define class_register(class) \
425 static struct lock_class_key __key; \
426 __class_register(class, &__key); \
430 struct class_compat *class_compat_register(const char *name);
431 void class_compat_unregister(struct class_compat *cls);
432 int class_compat_create_link(struct class_compat *cls, struct device *dev,
433 struct device *device_link);
434 void class_compat_remove_link(struct class_compat *cls, struct device *dev,
435 struct device *device_link);
437 extern void class_dev_iter_init(struct class_dev_iter *iter,
439 struct device *start,
440 const struct device_type *type);
441 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
442 extern void class_dev_iter_exit(struct class_dev_iter *iter);
444 extern int class_for_each_device(struct class *class, struct device *start,
446 int (*fn)(struct device *dev, void *data));
447 extern struct device *class_find_device(struct class *class,
448 struct device *start, const void *data,
449 int (*match)(struct device *, const void *));
451 struct class_attribute {
452 struct attribute attr;
453 ssize_t (*show)(struct class *class, struct class_attribute *attr,
455 ssize_t (*store)(struct class *class, struct class_attribute *attr,
456 const char *buf, size_t count);
459 #define CLASS_ATTR_RW(_name) \
460 struct class_attribute class_attr_##_name = __ATTR_RW(_name)
461 #define CLASS_ATTR_RO(_name) \
462 struct class_attribute class_attr_##_name = __ATTR_RO(_name)
463 #define CLASS_ATTR_WO(_name) \
464 struct class_attribute class_attr_##_name = __ATTR_WO(_name)
466 extern int __must_check class_create_file_ns(struct class *class,
467 const struct class_attribute *attr,
469 extern void class_remove_file_ns(struct class *class,
470 const struct class_attribute *attr,
473 static inline int __must_check class_create_file(struct class *class,
474 const struct class_attribute *attr)
476 return class_create_file_ns(class, attr, NULL);
479 static inline void class_remove_file(struct class *class,
480 const struct class_attribute *attr)
482 return class_remove_file_ns(class, attr, NULL);
485 /* Simple class attribute that is just a static string */
486 struct class_attribute_string {
487 struct class_attribute attr;
491 /* Currently read-only only */
492 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
493 { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
494 #define CLASS_ATTR_STRING(_name, _mode, _str) \
495 struct class_attribute_string class_attr_##_name = \
496 _CLASS_ATTR_STRING(_name, _mode, _str)
498 extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
501 struct class_interface {
502 struct list_head node;
505 int (*add_dev) (struct device *, struct class_interface *);
506 void (*remove_dev) (struct device *, struct class_interface *);
509 extern int __must_check class_interface_register(struct class_interface *);
510 extern void class_interface_unregister(struct class_interface *);
512 extern struct class * __must_check __class_create(struct module *owner,
514 struct lock_class_key *key);
515 extern void class_destroy(struct class *cls);
517 /* This is a #define to keep the compiler from merging different
518 * instances of the __key variable */
519 #define class_create(owner, name) \
521 static struct lock_class_key __key; \
522 __class_create(owner, name, &__key); \
526 * The type of device, "struct device" is embedded in. A class
527 * or bus can contain devices of different types
528 * like "partitions" and "disks", "mouse" and "event".
529 * This identifies the device type and carries type-specific
530 * information, equivalent to the kobj_type of a kobject.
531 * If "name" is specified, the uevent will contain it in
532 * the DEVTYPE variable.
536 const struct attribute_group **groups;
537 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
538 char *(*devnode)(struct device *dev, umode_t *mode,
539 kuid_t *uid, kgid_t *gid);
540 void (*release)(struct device *dev);
542 const struct dev_pm_ops *pm;
545 /* interface for exporting device attributes */
546 struct device_attribute {
547 struct attribute attr;
548 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
550 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
551 const char *buf, size_t count);
554 struct dev_ext_attribute {
555 struct device_attribute attr;
559 ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
561 ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
562 const char *buf, size_t count);
563 ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
565 ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
566 const char *buf, size_t count);
567 ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
569 ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
570 const char *buf, size_t count);
572 #define DEVICE_ATTR(_name, _mode, _show, _store) \
573 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
574 #define DEVICE_ATTR_RW(_name) \
575 struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
576 #define DEVICE_ATTR_RO(_name) \
577 struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
578 #define DEVICE_ATTR_WO(_name) \
579 struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
580 #define DEVICE_ULONG_ATTR(_name, _mode, _var) \
581 struct dev_ext_attribute dev_attr_##_name = \
582 { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
583 #define DEVICE_INT_ATTR(_name, _mode, _var) \
584 struct dev_ext_attribute dev_attr_##_name = \
585 { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
586 #define DEVICE_BOOL_ATTR(_name, _mode, _var) \
587 struct dev_ext_attribute dev_attr_##_name = \
588 { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
589 #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
590 struct device_attribute dev_attr_##_name = \
591 __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
593 extern int device_create_file(struct device *device,
594 const struct device_attribute *entry);
595 extern void device_remove_file(struct device *dev,
596 const struct device_attribute *attr);
597 extern bool device_remove_file_self(struct device *dev,
598 const struct device_attribute *attr);
599 extern int __must_check device_create_bin_file(struct device *dev,
600 const struct bin_attribute *attr);
601 extern void device_remove_bin_file(struct device *dev,
602 const struct bin_attribute *attr);
604 /* device resource management */
605 typedef void (*dr_release_t)(struct device *dev, void *res);
606 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
608 #ifdef CONFIG_DEBUG_DEVRES
609 extern void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
610 int nid, const char *name) __malloc;
611 #define devres_alloc(release, size, gfp) \
612 __devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release)
613 #define devres_alloc_node(release, size, gfp, nid) \
614 __devres_alloc_node(release, size, gfp, nid, #release)
616 extern void *devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
618 static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
620 return devres_alloc_node(release, size, gfp, NUMA_NO_NODE);
624 extern void devres_for_each_res(struct device *dev, dr_release_t release,
625 dr_match_t match, void *match_data,
626 void (*fn)(struct device *, void *, void *),
628 extern void devres_free(void *res);
629 extern void devres_add(struct device *dev, void *res);
630 extern void *devres_find(struct device *dev, dr_release_t release,
631 dr_match_t match, void *match_data);
632 extern void *devres_get(struct device *dev, void *new_res,
633 dr_match_t match, void *match_data);
634 extern void *devres_remove(struct device *dev, dr_release_t release,
635 dr_match_t match, void *match_data);
636 extern int devres_destroy(struct device *dev, dr_release_t release,
637 dr_match_t match, void *match_data);
638 extern int devres_release(struct device *dev, dr_release_t release,
639 dr_match_t match, void *match_data);
642 extern void * __must_check devres_open_group(struct device *dev, void *id,
644 extern void devres_close_group(struct device *dev, void *id);
645 extern void devres_remove_group(struct device *dev, void *id);
646 extern int devres_release_group(struct device *dev, void *id);
648 /* managed devm_k.alloc/kfree for device drivers */
649 extern void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
650 extern __printf(3, 0)
651 char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt,
652 va_list ap) __malloc;
653 extern __printf(3, 4)
654 char *devm_kasprintf(struct device *dev, gfp_t gfp, const char *fmt, ...) __malloc;
655 static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
657 return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
659 static inline void *devm_kmalloc_array(struct device *dev,
660 size_t n, size_t size, gfp_t flags)
662 if (size != 0 && n > SIZE_MAX / size)
664 return devm_kmalloc(dev, n * size, flags);
666 static inline void *devm_kcalloc(struct device *dev,
667 size_t n, size_t size, gfp_t flags)
669 return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
671 extern void devm_kfree(struct device *dev, void *p);
672 extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
673 extern void *devm_kmemdup(struct device *dev, const void *src, size_t len,
676 extern unsigned long devm_get_free_pages(struct device *dev,
677 gfp_t gfp_mask, unsigned int order);
678 extern void devm_free_pages(struct device *dev, unsigned long addr);
680 void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);
682 /* allows to add/remove a custom action to devres stack */
683 int devm_add_action(struct device *dev, void (*action)(void *), void *data);
684 void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
686 static inline int devm_add_action_or_reset(struct device *dev,
687 void (*action)(void *), void *data)
691 ret = devm_add_action(dev, action, data);
699 * devm_alloc_percpu - Resource-managed alloc_percpu
700 * @dev: Device to allocate per-cpu memory for
701 * @type: Type to allocate per-cpu memory for
703 * Managed alloc_percpu. Per-cpu memory allocated with this function is
704 * automatically freed on driver detach.
707 * Pointer to allocated memory on success, NULL on failure.
709 #define devm_alloc_percpu(dev, type) \
710 ((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), \
713 void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,
715 void devm_free_percpu(struct device *dev, void __percpu *pdata);
717 struct device_dma_parameters {
719 * a low level driver may set these to teach IOMMU code about
722 unsigned int max_segment_size;
723 unsigned long segment_boundary_mask;
727 * enum device_link_state - Device link states.
728 * @DL_STATE_NONE: The presence of the drivers is not being tracked.
729 * @DL_STATE_DORMANT: None of the supplier/consumer drivers is present.
730 * @DL_STATE_AVAILABLE: The supplier driver is present, but the consumer is not.
731 * @DL_STATE_CONSUMER_PROBE: The consumer is probing (supplier driver present).
732 * @DL_STATE_ACTIVE: Both the supplier and consumer drivers are present.
733 * @DL_STATE_SUPPLIER_UNBIND: The supplier driver is unbinding.
735 enum device_link_state {
737 DL_STATE_DORMANT = 0,
739 DL_STATE_CONSUMER_PROBE,
741 DL_STATE_SUPPLIER_UNBIND,
747 * STATELESS: The core won't track the presence of supplier/consumer drivers.
748 * AUTOREMOVE: Remove this link automatically on consumer driver unbind.
749 * PM_RUNTIME: If set, the runtime PM framework will use this link.
750 * RPM_ACTIVE: Run pm_runtime_get_sync() on the supplier during link creation.
752 #define DL_FLAG_STATELESS BIT(0)
753 #define DL_FLAG_AUTOREMOVE BIT(1)
754 #define DL_FLAG_PM_RUNTIME BIT(2)
755 #define DL_FLAG_RPM_ACTIVE BIT(3)
758 * struct device_link - Device link representation.
759 * @supplier: The device on the supplier end of the link.
760 * @s_node: Hook to the supplier device's list of links to consumers.
761 * @consumer: The device on the consumer end of the link.
762 * @c_node: Hook to the consumer device's list of links to suppliers.
763 * @status: The state of the link (with respect to the presence of drivers).
764 * @flags: Link flags.
765 * @rpm_active: Whether or not the consumer device is runtime-PM-active.
766 * @rcu_head: An RCU head to use for deferred execution of SRCU callbacks.
769 struct device *supplier;
770 struct list_head s_node;
771 struct device *consumer;
772 struct list_head c_node;
773 enum device_link_state status;
777 struct rcu_head rcu_head;
782 * enum dl_dev_state - Device driver presence tracking information.
783 * @DL_DEV_NO_DRIVER: There is no driver attached to the device.
784 * @DL_DEV_PROBING: A driver is probing.
785 * @DL_DEV_DRIVER_BOUND: The driver has been bound to the device.
786 * @DL_DEV_UNBINDING: The driver is unbinding from the device.
789 DL_DEV_NO_DRIVER = 0,
796 * struct dev_links_info - Device data related to device links.
797 * @suppliers: List of links to supplier devices.
798 * @consumers: List of links to consumer devices.
799 * @status: Driver status information.
801 struct dev_links_info {
802 struct list_head suppliers;
803 struct list_head consumers;
804 enum dl_dev_state status;
808 * struct device - The basic device structure
809 * @parent: The device's "parent" device, the device to which it is attached.
810 * In most cases, a parent device is some sort of bus or host
811 * controller. If parent is NULL, the device, is a top-level device,
812 * which is not usually what you want.
813 * @p: Holds the private data of the driver core portions of the device.
814 * See the comment of the struct device_private for detail.
815 * @kobj: A top-level, abstract class from which other classes are derived.
816 * @init_name: Initial name of the device.
817 * @type: The type of device.
818 * This identifies the device type and carries type-specific
820 * @mutex: Mutex to synchronize calls to its driver.
821 * @bus: Type of bus device is on.
822 * @driver: Which driver has allocated this
823 * @platform_data: Platform data specific to the device.
824 * Example: For devices on custom boards, as typical of embedded
825 * and SOC based hardware, Linux often uses platform_data to point
826 * to board-specific structures describing devices and how they
827 * are wired. That can include what ports are available, chip
828 * variants, which GPIO pins act in what additional roles, and so
829 * on. This shrinks the "Board Support Packages" (BSPs) and
830 * minimizes board-specific #ifdefs in drivers.
831 * @driver_data: Private pointer for driver specific info.
832 * @links: Links to suppliers and consumers of this device.
833 * @power: For device power management.
834 * See Documentation/driver-api/pm/devices.rst for details.
835 * @pm_domain: Provide callbacks that are executed during system suspend,
836 * hibernation, system resume and during runtime PM transitions
837 * along with subsystem-level and driver-level callbacks.
838 * @pins: For device pin management.
839 * See Documentation/driver-api/pinctl.rst for details.
840 * @msi_list: Hosts MSI descriptors
841 * @msi_domain: The generic MSI domain this device is using.
842 * @numa_node: NUMA node this device is close to.
843 * @dma_ops: DMA mapping operations for this device.
844 * @dma_mask: Dma mask (if dma'ble device).
845 * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
846 * hardware supports 64-bit addresses for consistent allocations
848 * @dma_pfn_offset: offset of DMA memory range relatively of RAM
849 * @dma_parms: A low level driver may set these to teach IOMMU code about
850 * segment limitations.
851 * @dma_pools: Dma pools (if dma'ble device).
852 * @dma_mem: Internal for coherent mem override.
853 * @cma_area: Contiguous memory area for dma allocations
854 * @archdata: For arch-specific additions.
855 * @of_node: Associated device tree node.
856 * @fwnode: Associated device node supplied by platform firmware.
857 * @devt: For creating the sysfs "dev".
858 * @id: device instance
859 * @devres_lock: Spinlock to protect the resource of the device.
860 * @devres_head: The resources list of the device.
861 * @knode_class: The node used to add the device to the class list.
862 * @class: The class of the device.
863 * @groups: Optional attribute groups.
864 * @release: Callback to free the device after all references have
865 * gone away. This should be set by the allocator of the
866 * device (i.e. the bus driver that discovered the device).
867 * @iommu_group: IOMMU group the device belongs to.
868 * @iommu_fwspec: IOMMU-specific properties supplied by firmware.
870 * @offline_disabled: If set, the device is permanently online.
871 * @offline: Set after successful invocation of bus type's .offline().
872 * @of_node_reused: Set if the device-tree node is shared with an ancestor
875 * At the lowest level, every device in a Linux system is represented by an
876 * instance of struct device. The device structure contains the information
877 * that the device model core needs to model the system. Most subsystems,
878 * however, track additional information about the devices they host. As a
879 * result, it is rare for devices to be represented by bare device structures;
880 * instead, that structure, like kobject structures, is usually embedded within
881 * a higher-level representation of the device.
884 struct device *parent;
886 struct device_private *p;
889 const char *init_name; /* initial name of the device */
890 const struct device_type *type;
892 struct mutex mutex; /* mutex to synchronize calls to
896 struct bus_type *bus; /* type of bus device is on */
897 struct device_driver *driver; /* which driver has allocated this
899 void *platform_data; /* Platform specific data, device
900 core doesn't touch it */
901 void *driver_data; /* Driver data, set and get with
902 dev_set/get_drvdata */
903 struct dev_links_info links;
904 struct dev_pm_info power;
905 struct dev_pm_domain *pm_domain;
907 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
908 struct irq_domain *msi_domain;
910 #ifdef CONFIG_PINCTRL
911 struct dev_pin_info *pins;
913 #ifdef CONFIG_GENERIC_MSI_IRQ
914 struct list_head msi_list;
918 int numa_node; /* NUMA node this device is close to */
920 const struct dma_map_ops *dma_ops;
921 u64 *dma_mask; /* dma mask (if dma'able device) */
922 u64 coherent_dma_mask;/* Like dma_mask, but for
923 alloc_coherent mappings as
924 not all hardware supports
925 64 bit addresses for consistent
926 allocations such descriptors. */
927 unsigned long dma_pfn_offset;
929 struct device_dma_parameters *dma_parms;
931 struct list_head dma_pools; /* dma pools (if dma'ble) */
933 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
935 #ifdef CONFIG_DMA_CMA
936 struct cma *cma_area; /* contiguous memory area for dma
939 /* arch specific additions */
940 struct dev_archdata archdata;
942 struct device_node *of_node; /* associated device tree node */
943 struct fwnode_handle *fwnode; /* firmware device node */
945 dev_t devt; /* dev_t, creates the sysfs "dev" */
946 u32 id; /* device instance */
948 spinlock_t devres_lock;
949 struct list_head devres_head;
951 struct klist_node knode_class;
953 const struct attribute_group **groups; /* optional groups */
955 void (*release)(struct device *dev);
956 struct iommu_group *iommu_group;
957 struct iommu_fwspec *iommu_fwspec;
959 bool offline_disabled:1;
961 bool of_node_reused:1;
964 static inline struct device *kobj_to_dev(struct kobject *kobj)
966 return container_of(kobj, struct device, kobj);
969 /* Get the wakeup routines, which depend on struct device */
970 #include <linux/pm_wakeup.h>
972 static inline const char *dev_name(const struct device *dev)
974 /* Use the init name until the kobject becomes available */
976 return dev->init_name;
978 return kobject_name(&dev->kobj);
981 extern __printf(2, 3)
982 int dev_set_name(struct device *dev, const char *name, ...);
985 static inline int dev_to_node(struct device *dev)
987 return dev->numa_node;
989 static inline void set_dev_node(struct device *dev, int node)
991 dev->numa_node = node;
994 static inline int dev_to_node(struct device *dev)
998 static inline void set_dev_node(struct device *dev, int node)
1003 static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
1005 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
1006 return dev->msi_domain;
1012 static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d)
1014 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
1015 dev->msi_domain = d;
1019 static inline void *dev_get_drvdata(const struct device *dev)
1021 return dev->driver_data;
1024 static inline void dev_set_drvdata(struct device *dev, void *data)
1026 dev->driver_data = data;
1029 static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
1031 return dev ? dev->power.subsys_data : NULL;
1034 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
1036 return dev->kobj.uevent_suppress;
1039 static inline void dev_set_uevent_suppress(struct device *dev, int val)
1041 dev->kobj.uevent_suppress = val;
1044 static inline int device_is_registered(struct device *dev)
1046 return dev->kobj.state_in_sysfs;
1049 static inline void device_enable_async_suspend(struct device *dev)
1051 if (!dev->power.is_prepared)
1052 dev->power.async_suspend = true;
1055 static inline void device_disable_async_suspend(struct device *dev)
1057 if (!dev->power.is_prepared)
1058 dev->power.async_suspend = false;
1061 static inline bool device_async_suspend_enabled(struct device *dev)
1063 return !!dev->power.async_suspend;
1066 static inline void dev_pm_syscore_device(struct device *dev, bool val)
1068 #ifdef CONFIG_PM_SLEEP
1069 dev->power.syscore = val;
1073 static inline void dev_pm_set_driver_flags(struct device *dev, u32 flags)
1075 dev->power.driver_flags = flags;
1078 static inline bool dev_pm_test_driver_flags(struct device *dev, u32 flags)
1080 return !!(dev->power.driver_flags & flags);
1083 static inline void device_lock(struct device *dev)
1085 mutex_lock(&dev->mutex);
1088 static inline int device_lock_interruptible(struct device *dev)
1090 return mutex_lock_interruptible(&dev->mutex);
1093 static inline int device_trylock(struct device *dev)
1095 return mutex_trylock(&dev->mutex);
1098 static inline void device_unlock(struct device *dev)
1100 mutex_unlock(&dev->mutex);
1103 static inline void device_lock_assert(struct device *dev)
1105 lockdep_assert_held(&dev->mutex);
1108 static inline struct device_node *dev_of_node(struct device *dev)
1110 if (!IS_ENABLED(CONFIG_OF))
1112 return dev->of_node;
1115 void driver_init(void);
1118 * High level routines for use by the bus drivers
1120 extern int __must_check device_register(struct device *dev);
1121 extern void device_unregister(struct device *dev);
1122 extern void device_initialize(struct device *dev);
1123 extern int __must_check device_add(struct device *dev);
1124 extern void device_del(struct device *dev);
1125 extern int device_for_each_child(struct device *dev, void *data,
1126 int (*fn)(struct device *dev, void *data));
1127 extern int device_for_each_child_reverse(struct device *dev, void *data,
1128 int (*fn)(struct device *dev, void *data));
1129 extern struct device *device_find_child(struct device *dev, void *data,
1130 int (*match)(struct device *dev, void *data));
1131 extern int device_rename(struct device *dev, const char *new_name);
1132 extern int device_move(struct device *dev, struct device *new_parent,
1133 enum dpm_order dpm_order);
1134 extern const char *device_get_devnode(struct device *dev,
1135 umode_t *mode, kuid_t *uid, kgid_t *gid,
1138 static inline bool device_supports_offline(struct device *dev)
1140 return dev->bus && dev->bus->offline && dev->bus->online;
1143 extern void lock_device_hotplug(void);
1144 extern void unlock_device_hotplug(void);
1145 extern int lock_device_hotplug_sysfs(void);
1146 extern int device_offline(struct device *dev);
1147 extern int device_online(struct device *dev);
1148 extern void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
1149 extern void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
1150 void device_set_of_node_from_dev(struct device *dev, const struct device *dev2);
1152 static inline int dev_num_vf(struct device *dev)
1154 if (dev->bus && dev->bus->num_vf)
1155 return dev->bus->num_vf(dev);
1160 * Root device objects for grouping under /sys/devices
1162 extern struct device *__root_device_register(const char *name,
1163 struct module *owner);
1165 /* This is a macro to avoid include problems with THIS_MODULE */
1166 #define root_device_register(name) \
1167 __root_device_register(name, THIS_MODULE)
1169 extern void root_device_unregister(struct device *root);
1171 static inline void *dev_get_platdata(const struct device *dev)
1173 return dev->platform_data;
1177 * Manual binding of a device to driver. See drivers/base/bus.c
1178 * for information on use.
1180 extern int __must_check device_bind_driver(struct device *dev);
1181 extern void device_release_driver(struct device *dev);
1182 extern int __must_check device_attach(struct device *dev);
1183 extern int __must_check driver_attach(struct device_driver *drv);
1184 extern void device_initial_probe(struct device *dev);
1185 extern int __must_check device_reprobe(struct device *dev);
1187 extern bool device_is_bound(struct device *dev);
1190 * Easy functions for dynamically creating devices on the fly
1192 extern __printf(5, 0)
1193 struct device *device_create_vargs(struct class *cls, struct device *parent,
1194 dev_t devt, void *drvdata,
1195 const char *fmt, va_list vargs);
1196 extern __printf(5, 6)
1197 struct device *device_create(struct class *cls, struct device *parent,
1198 dev_t devt, void *drvdata,
1199 const char *fmt, ...);
1200 extern __printf(6, 7)
1201 struct device *device_create_with_groups(struct class *cls,
1202 struct device *parent, dev_t devt, void *drvdata,
1203 const struct attribute_group **groups,
1204 const char *fmt, ...);
1205 extern void device_destroy(struct class *cls, dev_t devt);
1207 extern int __must_check device_add_groups(struct device *dev,
1208 const struct attribute_group **groups);
1209 extern void device_remove_groups(struct device *dev,
1210 const struct attribute_group **groups);
1212 static inline int __must_check device_add_group(struct device *dev,
1213 const struct attribute_group *grp)
1215 const struct attribute_group *groups[] = { grp, NULL };
1217 return device_add_groups(dev, groups);
1220 static inline void device_remove_group(struct device *dev,
1221 const struct attribute_group *grp)
1223 const struct attribute_group *groups[] = { grp, NULL };
1225 return device_remove_groups(dev, groups);
1228 extern int __must_check devm_device_add_groups(struct device *dev,
1229 const struct attribute_group **groups);
1230 extern void devm_device_remove_groups(struct device *dev,
1231 const struct attribute_group **groups);
1232 extern int __must_check devm_device_add_group(struct device *dev,
1233 const struct attribute_group *grp);
1234 extern void devm_device_remove_group(struct device *dev,
1235 const struct attribute_group *grp);
1238 * Platform "fixup" functions - allow the platform to have their say
1239 * about devices and actions that the general device layer doesn't
1242 /* Notify platform of device discovery */
1243 extern int (*platform_notify)(struct device *dev);
1245 extern int (*platform_notify_remove)(struct device *dev);
1249 * get_device - atomically increment the reference count for the device.
1252 extern struct device *get_device(struct device *dev);
1253 extern void put_device(struct device *dev);
1255 #ifdef CONFIG_DEVTMPFS
1256 extern int devtmpfs_create_node(struct device *dev);
1257 extern int devtmpfs_delete_node(struct device *dev);
1258 extern int devtmpfs_mount(const char *mntdir);
1260 static inline int devtmpfs_create_node(struct device *dev) { return 0; }
1261 static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
1262 static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
1265 /* drivers/base/power/shutdown.c */
1266 extern void device_shutdown(void);
1268 /* debugging and troubleshooting/diagnostic helpers. */
1269 extern const char *dev_driver_string(const struct device *dev);
1271 /* Device links interface. */
1272 struct device_link *device_link_add(struct device *consumer,
1273 struct device *supplier, u32 flags);
1274 void device_link_del(struct device_link *link);
1276 #ifdef CONFIG_PRINTK
1278 extern __printf(3, 0)
1279 int dev_vprintk_emit(int level, const struct device *dev,
1280 const char *fmt, va_list args);
1281 extern __printf(3, 4)
1282 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...);
1284 extern __printf(3, 4)
1285 void dev_printk(const char *level, const struct device *dev,
1286 const char *fmt, ...);
1287 extern __printf(2, 3)
1288 void dev_emerg(const struct device *dev, const char *fmt, ...);
1289 extern __printf(2, 3)
1290 void dev_alert(const struct device *dev, const char *fmt, ...);
1291 extern __printf(2, 3)
1292 void dev_crit(const struct device *dev, const char *fmt, ...);
1293 extern __printf(2, 3)
1294 void dev_err(const struct device *dev, const char *fmt, ...);
1295 extern __printf(2, 3)
1296 void dev_warn(const struct device *dev, const char *fmt, ...);
1297 extern __printf(2, 3)
1298 void dev_notice(const struct device *dev, const char *fmt, ...);
1299 extern __printf(2, 3)
1300 void _dev_info(const struct device *dev, const char *fmt, ...);
1304 static inline __printf(3, 0)
1305 int dev_vprintk_emit(int level, const struct device *dev,
1306 const char *fmt, va_list args)
1308 static inline __printf(3, 4)
1309 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
1312 static inline void __dev_printk(const char *level, const struct device *dev,
1313 struct va_format *vaf)
1315 static inline __printf(3, 4)
1316 void dev_printk(const char *level, const struct device *dev,
1317 const char *fmt, ...)
1320 static inline __printf(2, 3)
1321 void dev_emerg(const struct device *dev, const char *fmt, ...)
1323 static inline __printf(2, 3)
1324 void dev_crit(const struct device *dev, const char *fmt, ...)
1326 static inline __printf(2, 3)
1327 void dev_alert(const struct device *dev, const char *fmt, ...)
1329 static inline __printf(2, 3)
1330 void dev_err(const struct device *dev, const char *fmt, ...)
1332 static inline __printf(2, 3)
1333 void dev_warn(const struct device *dev, const char *fmt, ...)
1335 static inline __printf(2, 3)
1336 void dev_notice(const struct device *dev, const char *fmt, ...)
1338 static inline __printf(2, 3)
1339 void _dev_info(const struct device *dev, const char *fmt, ...)
1345 * Stupid hackaround for existing uses of non-printk uses dev_info
1347 * Note that the definition of dev_info below is actually _dev_info
1348 * and a macro is used to avoid redefining dev_info
1351 #define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)
1353 #if defined(CONFIG_DYNAMIC_DEBUG)
1354 #define dev_dbg(dev, format, ...) \
1356 dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
1358 #elif defined(DEBUG)
1359 #define dev_dbg(dev, format, arg...) \
1360 dev_printk(KERN_DEBUG, dev, format, ##arg)
1362 #define dev_dbg(dev, format, arg...) \
1365 dev_printk(KERN_DEBUG, dev, format, ##arg); \
1369 #ifdef CONFIG_PRINTK
1370 #define dev_level_once(dev_level, dev, fmt, ...) \
1372 static bool __print_once __read_mostly; \
1374 if (!__print_once) { \
1375 __print_once = true; \
1376 dev_level(dev, fmt, ##__VA_ARGS__); \
1380 #define dev_level_once(dev_level, dev, fmt, ...) \
1383 dev_level(dev, fmt, ##__VA_ARGS__); \
1387 #define dev_emerg_once(dev, fmt, ...) \
1388 dev_level_once(dev_emerg, dev, fmt, ##__VA_ARGS__)
1389 #define dev_alert_once(dev, fmt, ...) \
1390 dev_level_once(dev_alert, dev, fmt, ##__VA_ARGS__)
1391 #define dev_crit_once(dev, fmt, ...) \
1392 dev_level_once(dev_crit, dev, fmt, ##__VA_ARGS__)
1393 #define dev_err_once(dev, fmt, ...) \
1394 dev_level_once(dev_err, dev, fmt, ##__VA_ARGS__)
1395 #define dev_warn_once(dev, fmt, ...) \
1396 dev_level_once(dev_warn, dev, fmt, ##__VA_ARGS__)
1397 #define dev_notice_once(dev, fmt, ...) \
1398 dev_level_once(dev_notice, dev, fmt, ##__VA_ARGS__)
1399 #define dev_info_once(dev, fmt, ...) \
1400 dev_level_once(dev_info, dev, fmt, ##__VA_ARGS__)
1401 #define dev_dbg_once(dev, fmt, ...) \
1402 dev_level_once(dev_dbg, dev, fmt, ##__VA_ARGS__)
1404 #define dev_level_ratelimited(dev_level, dev, fmt, ...) \
1406 static DEFINE_RATELIMIT_STATE(_rs, \
1407 DEFAULT_RATELIMIT_INTERVAL, \
1408 DEFAULT_RATELIMIT_BURST); \
1409 if (__ratelimit(&_rs)) \
1410 dev_level(dev, fmt, ##__VA_ARGS__); \
1413 #define dev_emerg_ratelimited(dev, fmt, ...) \
1414 dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__)
1415 #define dev_alert_ratelimited(dev, fmt, ...) \
1416 dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__)
1417 #define dev_crit_ratelimited(dev, fmt, ...) \
1418 dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__)
1419 #define dev_err_ratelimited(dev, fmt, ...) \
1420 dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__)
1421 #define dev_warn_ratelimited(dev, fmt, ...) \
1422 dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__)
1423 #define dev_notice_ratelimited(dev, fmt, ...) \
1424 dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
1425 #define dev_info_ratelimited(dev, fmt, ...) \
1426 dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
1427 #if defined(CONFIG_DYNAMIC_DEBUG)
1428 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
1429 #define dev_dbg_ratelimited(dev, fmt, ...) \
1431 static DEFINE_RATELIMIT_STATE(_rs, \
1432 DEFAULT_RATELIMIT_INTERVAL, \
1433 DEFAULT_RATELIMIT_BURST); \
1434 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
1435 if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) && \
1436 __ratelimit(&_rs)) \
1437 __dynamic_dev_dbg(&descriptor, dev, fmt, \
1440 #elif defined(DEBUG)
1441 #define dev_dbg_ratelimited(dev, fmt, ...) \
1443 static DEFINE_RATELIMIT_STATE(_rs, \
1444 DEFAULT_RATELIMIT_INTERVAL, \
1445 DEFAULT_RATELIMIT_BURST); \
1446 if (__ratelimit(&_rs)) \
1447 dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \
1450 #define dev_dbg_ratelimited(dev, fmt, ...) \
1453 dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \
1457 #ifdef VERBOSE_DEBUG
1458 #define dev_vdbg dev_dbg
1460 #define dev_vdbg(dev, format, arg...) \
1463 dev_printk(KERN_DEBUG, dev, format, ##arg); \
1468 * dev_WARN*() acts like dev_printk(), but with the key difference of
1469 * using WARN/WARN_ONCE to include file/line information and a backtrace.
1471 #define dev_WARN(dev, format, arg...) \
1472 WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg);
1474 #define dev_WARN_ONCE(dev, condition, format, arg...) \
1475 WARN_ONCE(condition, "%s %s: " format, \
1476 dev_driver_string(dev), dev_name(dev), ## arg)
1478 /* Create alias, so I can be autoloaded. */
1479 #define MODULE_ALIAS_CHARDEV(major,minor) \
1480 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
1481 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
1482 MODULE_ALIAS("char-major-" __stringify(major) "-*")
1484 #ifdef CONFIG_SYSFS_DEPRECATED
1485 extern long sysfs_deprecated;
1487 #define sysfs_deprecated 0
1491 * module_driver() - Helper macro for drivers that don't do anything
1492 * special in module init/exit. This eliminates a lot of boilerplate.
1493 * Each module may only use this macro once, and calling it replaces
1494 * module_init() and module_exit().
1496 * @__driver: driver name
1497 * @__register: register function for this driver type
1498 * @__unregister: unregister function for this driver type
1499 * @...: Additional arguments to be passed to __register and __unregister.
1501 * Use this macro to construct bus specific macros for registering
1502 * drivers, and do not use it on its own.
1504 #define module_driver(__driver, __register, __unregister, ...) \
1505 static int __init __driver##_init(void) \
1507 return __register(&(__driver) , ##__VA_ARGS__); \
1509 module_init(__driver##_init); \
1510 static void __exit __driver##_exit(void) \
1512 __unregister(&(__driver) , ##__VA_ARGS__); \
1514 module_exit(__driver##_exit);
1517 * builtin_driver() - Helper macro for drivers that don't do anything
1518 * special in init and have no exit. This eliminates some boilerplate.
1519 * Each driver may only use this macro once, and calling it replaces
1520 * device_initcall (or in some cases, the legacy __initcall). This is
1521 * meant to be a direct parallel of module_driver() above but without
1522 * the __exit stuff that is not used for builtin cases.
1524 * @__driver: driver name
1525 * @__register: register function for this driver type
1526 * @...: Additional arguments to be passed to __register
1528 * Use this macro to construct bus specific macros for registering
1529 * drivers, and do not use it on its own.
1531 #define builtin_driver(__driver, __register, ...) \
1532 static int __init __driver##_init(void) \
1534 return __register(&(__driver) , ##__VA_ARGS__); \
1536 device_initcall(__driver##_init);
1538 #endif /* _DEVICE_H_ */