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 * @dev_attrs: Default attributes of the devices on the bus.
70 * @bus_groups: Default attributes of the bus.
71 * @dev_groups: Default attributes of the devices on the bus.
72 * @drv_groups: Default attributes of the device drivers on the bus.
73 * @match: Called, perhaps multiple times, whenever a new device or driver
74 * is added for this bus. It should return a positive value if the
75 * given device can be handled by the given driver and zero
76 * otherwise. It may also return error code if determining that
77 * the driver supports the device is not possible. In case of
78 * -EPROBE_DEFER it will queue the device for deferred probing.
79 * @uevent: Called when a device is added, removed, or a few other things
80 * that generate uevents to add the environment variables.
81 * @probe: Called when a new device or driver add to this bus, and callback
82 * the specific driver's probe to initial the matched device.
83 * @remove: Called when a device removed from this bus.
84 * @shutdown: Called at shut-down time to quiesce the device.
86 * @online: Called to put the device back online (after offlining it).
87 * @offline: Called to put the device offline for hot-removal. May fail.
89 * @suspend: Called when a device on this bus wants to go to sleep mode.
90 * @resume: Called to bring a device on this bus out of sleep mode.
91 * @pm: Power management operations of this bus, callback the specific
92 * device driver's pm-ops.
93 * @iommu_ops: IOMMU specific operations for this bus, used to attach IOMMU
94 * driver implementations to a bus and allow the driver to do
96 * @p: The private data of the driver core, only the driver core can
98 * @lock_key: Lock class key for use by the lock validator
100 * A bus is a channel between the processor and one or more devices. For the
101 * purposes of the device model, all devices are connected via a bus, even if
102 * it is an internal, virtual, "platform" bus. Buses can plug into each other.
103 * A USB controller is usually a PCI device, for example. The device model
104 * represents the actual connections between buses and the devices they control.
105 * A bus is represented by the bus_type structure. It contains the name, the
106 * default attributes, the bus' methods, PM operations, and the driver core's
111 const char *dev_name;
112 struct device *dev_root;
113 struct device_attribute *dev_attrs; /* use dev_groups instead */
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 const struct dev_pm_ops *pm;
132 const struct iommu_ops *iommu_ops;
134 struct subsys_private *p;
135 struct lock_class_key lock_key;
138 extern int __must_check bus_register(struct bus_type *bus);
140 extern void bus_unregister(struct bus_type *bus);
142 extern int __must_check bus_rescan_devices(struct bus_type *bus);
144 /* iterator helpers for buses */
145 struct subsys_dev_iter {
146 struct klist_iter ki;
147 const struct device_type *type;
149 void subsys_dev_iter_init(struct subsys_dev_iter *iter,
150 struct bus_type *subsys,
151 struct device *start,
152 const struct device_type *type);
153 struct device *subsys_dev_iter_next(struct subsys_dev_iter *iter);
154 void subsys_dev_iter_exit(struct subsys_dev_iter *iter);
156 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
157 int (*fn)(struct device *dev, void *data));
158 struct device *bus_find_device(struct bus_type *bus, struct device *start,
160 int (*match)(struct device *dev, void *data));
161 struct device *bus_find_device_by_name(struct bus_type *bus,
162 struct device *start,
164 struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id,
165 struct device *hint);
166 int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
167 void *data, int (*fn)(struct device_driver *, void *));
168 void bus_sort_breadthfirst(struct bus_type *bus,
169 int (*compare)(const struct device *a,
170 const struct device *b));
172 * Bus notifiers: Get notified of addition/removal of devices
173 * and binding/unbinding of drivers to devices.
174 * In the long run, it should be a replacement for the platform
177 struct notifier_block;
179 extern int bus_register_notifier(struct bus_type *bus,
180 struct notifier_block *nb);
181 extern int bus_unregister_notifier(struct bus_type *bus,
182 struct notifier_block *nb);
184 /* All 4 notifers below get called with the target struct device *
185 * as an argument. Note that those functions are likely to be called
186 * with the device lock held in the core, so be careful.
188 #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
189 #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device to be removed */
190 #define BUS_NOTIFY_REMOVED_DEVICE 0x00000003 /* device removed */
191 #define BUS_NOTIFY_BIND_DRIVER 0x00000004 /* driver about to be
193 #define BUS_NOTIFY_BOUND_DRIVER 0x00000005 /* driver bound to device */
194 #define BUS_NOTIFY_UNBIND_DRIVER 0x00000006 /* driver about to be
196 #define BUS_NOTIFY_UNBOUND_DRIVER 0x00000007 /* driver is unbound
198 #define BUS_NOTIFY_DRIVER_NOT_BOUND 0x00000008 /* driver fails to be bound */
200 extern struct kset *bus_get_kset(struct bus_type *bus);
201 extern struct klist *bus_get_device_klist(struct bus_type *bus);
204 * enum probe_type - device driver probe type to try
205 * Device drivers may opt in for special handling of their
206 * respective probe routines. This tells the core what to
209 * @PROBE_DEFAULT_STRATEGY: Used by drivers that work equally well
210 * whether probed synchronously or asynchronously.
211 * @PROBE_PREFER_ASYNCHRONOUS: Drivers for "slow" devices which
212 * probing order is not essential for booting the system may
213 * opt into executing their probes asynchronously.
214 * @PROBE_FORCE_SYNCHRONOUS: Use this to annotate drivers that need
215 * their probe routines to run synchronously with driver and
216 * device registration (with the exception of -EPROBE_DEFER
217 * handling - re-probing always ends up being done asynchronously).
219 * Note that the end goal is to switch the kernel to use asynchronous
220 * probing by default, so annotating drivers with
221 * %PROBE_PREFER_ASYNCHRONOUS is a temporary measure that allows us
222 * to speed up boot process while we are validating the rest of the
226 PROBE_DEFAULT_STRATEGY,
227 PROBE_PREFER_ASYNCHRONOUS,
228 PROBE_FORCE_SYNCHRONOUS,
232 * struct device_driver - The basic device driver structure
233 * @name: Name of the device driver.
234 * @bus: The bus which the device of this driver belongs to.
235 * @owner: The module owner.
236 * @mod_name: Used for built-in modules.
237 * @suppress_bind_attrs: Disables bind/unbind via sysfs.
238 * @probe_type: Type of the probe (synchronous or asynchronous) to use.
239 * @of_match_table: The open firmware table.
240 * @acpi_match_table: The ACPI match table.
241 * @probe: Called to query the existence of a specific device,
242 * whether this driver can work with it, and bind the driver
243 * to a specific device.
244 * @remove: Called when the device is removed from the system to
245 * unbind a device from this driver.
246 * @shutdown: Called at shut-down time to quiesce the device.
247 * @suspend: Called to put the device to sleep mode. Usually to a
249 * @resume: Called to bring a device from sleep mode.
250 * @groups: Default attributes that get created by the driver core
252 * @pm: Power management operations of the device which matched
254 * @p: Driver core's private data, no one other than the driver
255 * core can touch this.
257 * The device driver-model tracks all of the drivers known to the system.
258 * The main reason for this tracking is to enable the driver core to match
259 * up drivers with new devices. Once drivers are known objects within the
260 * system, however, a number of other things become possible. Device drivers
261 * can export information and configuration variables that are independent
262 * of any specific device.
264 struct device_driver {
266 struct bus_type *bus;
268 struct module *owner;
269 const char *mod_name; /* used for built-in modules */
271 bool suppress_bind_attrs; /* disables bind/unbind via sysfs */
272 enum probe_type probe_type;
274 const struct of_device_id *of_match_table;
275 const struct acpi_device_id *acpi_match_table;
277 int (*probe) (struct device *dev);
278 int (*remove) (struct device *dev);
279 void (*shutdown) (struct device *dev);
280 int (*suspend) (struct device *dev, pm_message_t state);
281 int (*resume) (struct device *dev);
282 const struct attribute_group **groups;
284 const struct dev_pm_ops *pm;
286 struct driver_private *p;
290 extern int __must_check driver_register(struct device_driver *drv);
291 extern void driver_unregister(struct device_driver *drv);
293 extern struct device_driver *driver_find(const char *name,
294 struct bus_type *bus);
295 extern int driver_probe_done(void);
296 extern void wait_for_device_probe(void);
299 /* sysfs interface for exporting driver attributes */
301 struct driver_attribute {
302 struct attribute attr;
303 ssize_t (*show)(struct device_driver *driver, char *buf);
304 ssize_t (*store)(struct device_driver *driver, const char *buf,
308 #define DRIVER_ATTR(_name, _mode, _show, _store) \
309 struct driver_attribute driver_attr_##_name = __ATTR(_name, _mode, _show, _store)
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_attrs: 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 * @suspend: Used to put the device to sleep mode, usually to a low power
375 * @resume: Used to bring the device from the sleep mode.
376 * @ns_type: Callbacks so sysfs can detemine namespaces.
377 * @namespace: Namespace of the device belongs to this class.
378 * @pm: The default device power management operations of this class.
379 * @p: The private data of the driver core, no one other than the
380 * driver core can touch this.
382 * A class is a higher-level view of a device that abstracts out low-level
383 * implementation details. Drivers may see a SCSI disk or an ATA disk, but,
384 * at the class level, they are all simply disks. Classes allow user space
385 * to work with devices based on what they do, rather than how they are
386 * connected or how they work.
390 struct module *owner;
392 struct class_attribute *class_attrs;
393 const struct attribute_group **dev_groups;
394 struct kobject *dev_kobj;
396 int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
397 char *(*devnode)(struct device *dev, umode_t *mode);
399 void (*class_release)(struct class *class);
400 void (*dev_release)(struct device *dev);
402 int (*suspend)(struct device *dev, pm_message_t state);
403 int (*resume)(struct device *dev);
405 const struct kobj_ns_type_operations *ns_type;
406 const void *(*namespace)(struct device *dev);
408 const struct dev_pm_ops *pm;
410 struct subsys_private *p;
413 struct class_dev_iter {
414 struct klist_iter ki;
415 const struct device_type *type;
418 extern struct kobject *sysfs_dev_block_kobj;
419 extern struct kobject *sysfs_dev_char_kobj;
420 extern int __must_check __class_register(struct class *class,
421 struct lock_class_key *key);
422 extern void class_unregister(struct class *class);
424 /* This is a #define to keep the compiler from merging different
425 * instances of the __key variable */
426 #define class_register(class) \
428 static struct lock_class_key __key; \
429 __class_register(class, &__key); \
433 struct class_compat *class_compat_register(const char *name);
434 void class_compat_unregister(struct class_compat *cls);
435 int class_compat_create_link(struct class_compat *cls, struct device *dev,
436 struct device *device_link);
437 void class_compat_remove_link(struct class_compat *cls, struct device *dev,
438 struct device *device_link);
440 extern void class_dev_iter_init(struct class_dev_iter *iter,
442 struct device *start,
443 const struct device_type *type);
444 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
445 extern void class_dev_iter_exit(struct class_dev_iter *iter);
447 extern int class_for_each_device(struct class *class, struct device *start,
449 int (*fn)(struct device *dev, void *data));
450 extern struct device *class_find_device(struct class *class,
451 struct device *start, const void *data,
452 int (*match)(struct device *, const void *));
454 struct class_attribute {
455 struct attribute attr;
456 ssize_t (*show)(struct class *class, struct class_attribute *attr,
458 ssize_t (*store)(struct class *class, struct class_attribute *attr,
459 const char *buf, size_t count);
462 #define CLASS_ATTR(_name, _mode, _show, _store) \
463 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
464 #define CLASS_ATTR_RW(_name) \
465 struct class_attribute class_attr_##_name = __ATTR_RW(_name)
466 #define CLASS_ATTR_RO(_name) \
467 struct class_attribute class_attr_##_name = __ATTR_RO(_name)
469 extern int __must_check class_create_file_ns(struct class *class,
470 const struct class_attribute *attr,
472 extern void class_remove_file_ns(struct class *class,
473 const struct class_attribute *attr,
476 static inline int __must_check class_create_file(struct class *class,
477 const struct class_attribute *attr)
479 return class_create_file_ns(class, attr, NULL);
482 static inline void class_remove_file(struct class *class,
483 const struct class_attribute *attr)
485 return class_remove_file_ns(class, attr, NULL);
488 /* Simple class attribute that is just a static string */
489 struct class_attribute_string {
490 struct class_attribute attr;
494 /* Currently read-only only */
495 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
496 { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
497 #define CLASS_ATTR_STRING(_name, _mode, _str) \
498 struct class_attribute_string class_attr_##_name = \
499 _CLASS_ATTR_STRING(_name, _mode, _str)
501 extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
504 struct class_interface {
505 struct list_head node;
508 int (*add_dev) (struct device *, struct class_interface *);
509 void (*remove_dev) (struct device *, struct class_interface *);
512 extern int __must_check class_interface_register(struct class_interface *);
513 extern void class_interface_unregister(struct class_interface *);
515 extern struct class * __must_check __class_create(struct module *owner,
517 struct lock_class_key *key);
518 extern void class_destroy(struct class *cls);
520 /* This is a #define to keep the compiler from merging different
521 * instances of the __key variable */
522 #define class_create(owner, name) \
524 static struct lock_class_key __key; \
525 __class_create(owner, name, &__key); \
529 * The type of device, "struct device" is embedded in. A class
530 * or bus can contain devices of different types
531 * like "partitions" and "disks", "mouse" and "event".
532 * This identifies the device type and carries type-specific
533 * information, equivalent to the kobj_type of a kobject.
534 * If "name" is specified, the uevent will contain it in
535 * the DEVTYPE variable.
539 const struct attribute_group **groups;
540 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
541 char *(*devnode)(struct device *dev, umode_t *mode,
542 kuid_t *uid, kgid_t *gid);
543 void (*release)(struct device *dev);
545 const struct dev_pm_ops *pm;
548 /* interface for exporting device attributes */
549 struct device_attribute {
550 struct attribute attr;
551 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
553 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
554 const char *buf, size_t count);
557 struct dev_ext_attribute {
558 struct device_attribute attr;
562 ssize_t device_show_ulong(struct device *dev, struct device_attribute *attr,
564 ssize_t device_store_ulong(struct device *dev, struct device_attribute *attr,
565 const char *buf, size_t count);
566 ssize_t device_show_int(struct device *dev, struct device_attribute *attr,
568 ssize_t device_store_int(struct device *dev, struct device_attribute *attr,
569 const char *buf, size_t count);
570 ssize_t device_show_bool(struct device *dev, struct device_attribute *attr,
572 ssize_t device_store_bool(struct device *dev, struct device_attribute *attr,
573 const char *buf, size_t count);
575 #define DEVICE_ATTR(_name, _mode, _show, _store) \
576 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
577 #define DEVICE_ATTR_RW(_name) \
578 struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
579 #define DEVICE_ATTR_RO(_name) \
580 struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
581 #define DEVICE_ATTR_WO(_name) \
582 struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
583 #define DEVICE_ULONG_ATTR(_name, _mode, _var) \
584 struct dev_ext_attribute dev_attr_##_name = \
585 { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
586 #define DEVICE_INT_ATTR(_name, _mode, _var) \
587 struct dev_ext_attribute dev_attr_##_name = \
588 { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
589 #define DEVICE_BOOL_ATTR(_name, _mode, _var) \
590 struct dev_ext_attribute dev_attr_##_name = \
591 { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
592 #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
593 struct device_attribute dev_attr_##_name = \
594 __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
596 extern int device_create_file(struct device *device,
597 const struct device_attribute *entry);
598 extern void device_remove_file(struct device *dev,
599 const struct device_attribute *attr);
600 extern bool device_remove_file_self(struct device *dev,
601 const struct device_attribute *attr);
602 extern int __must_check device_create_bin_file(struct device *dev,
603 const struct bin_attribute *attr);
604 extern void device_remove_bin_file(struct device *dev,
605 const struct bin_attribute *attr);
607 /* device resource management */
608 typedef void (*dr_release_t)(struct device *dev, void *res);
609 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
611 #ifdef CONFIG_DEBUG_DEVRES
612 extern void *__devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
613 int nid, const char *name) __malloc;
614 #define devres_alloc(release, size, gfp) \
615 __devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release)
616 #define devres_alloc_node(release, size, gfp, nid) \
617 __devres_alloc_node(release, size, gfp, nid, #release)
619 extern void *devres_alloc_node(dr_release_t release, size_t size, gfp_t gfp,
621 static inline void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp)
623 return devres_alloc_node(release, size, gfp, NUMA_NO_NODE);
627 extern void devres_for_each_res(struct device *dev, dr_release_t release,
628 dr_match_t match, void *match_data,
629 void (*fn)(struct device *, void *, void *),
631 extern void devres_free(void *res);
632 extern void devres_add(struct device *dev, void *res);
633 extern void *devres_find(struct device *dev, dr_release_t release,
634 dr_match_t match, void *match_data);
635 extern void *devres_get(struct device *dev, void *new_res,
636 dr_match_t match, void *match_data);
637 extern void *devres_remove(struct device *dev, dr_release_t release,
638 dr_match_t match, void *match_data);
639 extern int devres_destroy(struct device *dev, dr_release_t release,
640 dr_match_t match, void *match_data);
641 extern int devres_release(struct device *dev, dr_release_t release,
642 dr_match_t match, void *match_data);
645 extern void * __must_check devres_open_group(struct device *dev, void *id,
647 extern void devres_close_group(struct device *dev, void *id);
648 extern void devres_remove_group(struct device *dev, void *id);
649 extern int devres_release_group(struct device *dev, void *id);
651 /* managed devm_k.alloc/kfree for device drivers */
652 extern void *devm_kmalloc(struct device *dev, size_t size, gfp_t gfp) __malloc;
653 extern __printf(3, 0)
654 char *devm_kvasprintf(struct device *dev, gfp_t gfp, const char *fmt,
655 va_list ap) __malloc;
656 extern __printf(3, 4)
657 char *devm_kasprintf(struct device *dev, gfp_t gfp, const char *fmt, ...) __malloc;
658 static inline void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp)
660 return devm_kmalloc(dev, size, gfp | __GFP_ZERO);
662 static inline void *devm_kmalloc_array(struct device *dev,
663 size_t n, size_t size, gfp_t flags)
665 if (size != 0 && n > SIZE_MAX / size)
667 return devm_kmalloc(dev, n * size, flags);
669 static inline void *devm_kcalloc(struct device *dev,
670 size_t n, size_t size, gfp_t flags)
672 return devm_kmalloc_array(dev, n, size, flags | __GFP_ZERO);
674 extern void devm_kfree(struct device *dev, void *p);
675 extern char *devm_kstrdup(struct device *dev, const char *s, gfp_t gfp) __malloc;
676 extern void *devm_kmemdup(struct device *dev, const void *src, size_t len,
679 extern unsigned long devm_get_free_pages(struct device *dev,
680 gfp_t gfp_mask, unsigned int order);
681 extern void devm_free_pages(struct device *dev, unsigned long addr);
683 void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);
685 /* allows to add/remove a custom action to devres stack */
686 int devm_add_action(struct device *dev, void (*action)(void *), void *data);
687 void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
689 static inline int devm_add_action_or_reset(struct device *dev,
690 void (*action)(void *), void *data)
694 ret = devm_add_action(dev, action, data);
702 * devm_alloc_percpu - Resource-managed alloc_percpu
703 * @dev: Device to allocate per-cpu memory for
704 * @type: Type to allocate per-cpu memory for
706 * Managed alloc_percpu. Per-cpu memory allocated with this function is
707 * automatically freed on driver detach.
710 * Pointer to allocated memory on success, NULL on failure.
712 #define devm_alloc_percpu(dev, type) \
713 ((typeof(type) __percpu *)__devm_alloc_percpu((dev), sizeof(type), \
716 void __percpu *__devm_alloc_percpu(struct device *dev, size_t size,
718 void devm_free_percpu(struct device *dev, void __percpu *pdata);
720 struct device_dma_parameters {
722 * a low level driver may set these to teach IOMMU code about
725 unsigned int max_segment_size;
726 unsigned long segment_boundary_mask;
730 * struct device - The basic device structure
731 * @parent: The device's "parent" device, the device to which it is attached.
732 * In most cases, a parent device is some sort of bus or host
733 * controller. If parent is NULL, the device, is a top-level device,
734 * which is not usually what you want.
735 * @p: Holds the private data of the driver core portions of the device.
736 * See the comment of the struct device_private for detail.
737 * @kobj: A top-level, abstract class from which other classes are derived.
738 * @init_name: Initial name of the device.
739 * @type: The type of device.
740 * This identifies the device type and carries type-specific
742 * @mutex: Mutex to synchronize calls to its driver.
743 * @bus: Type of bus device is on.
744 * @driver: Which driver has allocated this
745 * @platform_data: Platform data specific to the device.
746 * Example: For devices on custom boards, as typical of embedded
747 * and SOC based hardware, Linux often uses platform_data to point
748 * to board-specific structures describing devices and how they
749 * are wired. That can include what ports are available, chip
750 * variants, which GPIO pins act in what additional roles, and so
751 * on. This shrinks the "Board Support Packages" (BSPs) and
752 * minimizes board-specific #ifdefs in drivers.
753 * @driver_data: Private pointer for driver specific info.
754 * @power: For device power management.
755 * See Documentation/power/admin-guide/devices.rst for details.
756 * @pm_domain: Provide callbacks that are executed during system suspend,
757 * hibernation, system resume and during runtime PM transitions
758 * along with subsystem-level and driver-level callbacks.
759 * @pins: For device pin management.
760 * See Documentation/pinctrl.txt for details.
761 * @msi_list: Hosts MSI descriptors
762 * @msi_domain: The generic MSI domain this device is using.
763 * @numa_node: NUMA node this device is close to.
764 * @dma_mask: Dma mask (if dma'ble device).
765 * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
766 * hardware supports 64-bit addresses for consistent allocations
768 * @dma_pfn_offset: offset of DMA memory range relatively of RAM
769 * @dma_parms: A low level driver may set these to teach IOMMU code about
770 * segment limitations.
771 * @dma_pools: Dma pools (if dma'ble device).
772 * @dma_mem: Internal for coherent mem override.
773 * @cma_area: Contiguous memory area for dma allocations
774 * @archdata: For arch-specific additions.
775 * @of_node: Associated device tree node.
776 * @fwnode: Associated device node supplied by platform firmware.
777 * @devt: For creating the sysfs "dev".
778 * @id: device instance
779 * @devres_lock: Spinlock to protect the resource of the device.
780 * @devres_head: The resources list of the device.
781 * @knode_class: The node used to add the device to the class list.
782 * @class: The class of the device.
783 * @groups: Optional attribute groups.
784 * @release: Callback to free the device after all references have
785 * gone away. This should be set by the allocator of the
786 * device (i.e. the bus driver that discovered the device).
787 * @iommu_group: IOMMU group the device belongs to.
788 * @iommu_fwspec: IOMMU-specific properties supplied by firmware.
790 * @offline_disabled: If set, the device is permanently online.
791 * @offline: Set after successful invocation of bus type's .offline().
793 * At the lowest level, every device in a Linux system is represented by an
794 * instance of struct device. The device structure contains the information
795 * that the device model core needs to model the system. Most subsystems,
796 * however, track additional information about the devices they host. As a
797 * result, it is rare for devices to be represented by bare device structures;
798 * instead, that structure, like kobject structures, is usually embedded within
799 * a higher-level representation of the device.
802 struct device *parent;
804 struct device_private *p;
807 const char *init_name; /* initial name of the device */
808 const struct device_type *type;
810 struct mutex mutex; /* mutex to synchronize calls to
814 struct bus_type *bus; /* type of bus device is on */
815 struct device_driver *driver; /* which driver has allocated this
817 void *platform_data; /* Platform specific data, device
818 core doesn't touch it */
819 void *driver_data; /* Driver data, set and get with
820 dev_set/get_drvdata */
821 struct dev_pm_info power;
822 struct dev_pm_domain *pm_domain;
824 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
825 struct irq_domain *msi_domain;
827 #ifdef CONFIG_PINCTRL
828 struct dev_pin_info *pins;
830 #ifdef CONFIG_GENERIC_MSI_IRQ
831 struct list_head msi_list;
835 int numa_node; /* NUMA node this device is close to */
837 u64 *dma_mask; /* dma mask (if dma'able device) */
838 u64 coherent_dma_mask;/* Like dma_mask, but for
839 alloc_coherent mappings as
840 not all hardware supports
841 64 bit addresses for consistent
842 allocations such descriptors. */
843 unsigned long dma_pfn_offset;
845 struct device_dma_parameters *dma_parms;
847 struct list_head dma_pools; /* dma pools (if dma'ble) */
849 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
851 #ifdef CONFIG_DMA_CMA
852 struct cma *cma_area; /* contiguous memory area for dma
855 /* arch specific additions */
856 struct dev_archdata archdata;
858 struct device_node *of_node; /* associated device tree node */
859 struct fwnode_handle *fwnode; /* firmware device node */
861 dev_t devt; /* dev_t, creates the sysfs "dev" */
862 u32 id; /* device instance */
864 spinlock_t devres_lock;
865 struct list_head devres_head;
867 struct klist_node knode_class;
869 const struct attribute_group **groups; /* optional groups */
871 void (*release)(struct device *dev);
872 struct iommu_group *iommu_group;
873 struct iommu_fwspec *iommu_fwspec;
875 bool offline_disabled:1;
879 static inline struct device *kobj_to_dev(struct kobject *kobj)
881 return container_of(kobj, struct device, kobj);
884 /* Get the wakeup routines, which depend on struct device */
885 #include <linux/pm_wakeup.h>
887 static inline const char *dev_name(const struct device *dev)
889 /* Use the init name until the kobject becomes available */
891 return dev->init_name;
893 return kobject_name(&dev->kobj);
896 extern __printf(2, 3)
897 int dev_set_name(struct device *dev, const char *name, ...);
900 static inline int dev_to_node(struct device *dev)
902 return dev->numa_node;
904 static inline void set_dev_node(struct device *dev, int node)
906 dev->numa_node = node;
909 static inline int dev_to_node(struct device *dev)
913 static inline void set_dev_node(struct device *dev, int node)
918 static inline struct irq_domain *dev_get_msi_domain(const struct device *dev)
920 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
921 return dev->msi_domain;
927 static inline void dev_set_msi_domain(struct device *dev, struct irq_domain *d)
929 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
934 static inline void *dev_get_drvdata(const struct device *dev)
936 return dev->driver_data;
939 static inline void dev_set_drvdata(struct device *dev, void *data)
941 dev->driver_data = data;
944 static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
946 return dev ? dev->power.subsys_data : NULL;
949 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
951 return dev->kobj.uevent_suppress;
954 static inline void dev_set_uevent_suppress(struct device *dev, int val)
956 dev->kobj.uevent_suppress = val;
959 static inline int device_is_registered(struct device *dev)
961 return dev->kobj.state_in_sysfs;
964 static inline void device_enable_async_suspend(struct device *dev)
966 if (!dev->power.is_prepared)
967 dev->power.async_suspend = true;
970 static inline void device_disable_async_suspend(struct device *dev)
972 if (!dev->power.is_prepared)
973 dev->power.async_suspend = false;
976 static inline bool device_async_suspend_enabled(struct device *dev)
978 return !!dev->power.async_suspend;
981 static inline void dev_pm_syscore_device(struct device *dev, bool val)
983 #ifdef CONFIG_PM_SLEEP
984 dev->power.syscore = val;
988 static inline void device_lock(struct device *dev)
990 mutex_lock(&dev->mutex);
993 static inline int device_lock_interruptible(struct device *dev)
995 return mutex_lock_interruptible(&dev->mutex);
998 static inline int device_trylock(struct device *dev)
1000 return mutex_trylock(&dev->mutex);
1003 static inline void device_unlock(struct device *dev)
1005 mutex_unlock(&dev->mutex);
1008 static inline void device_lock_assert(struct device *dev)
1010 lockdep_assert_held(&dev->mutex);
1013 static inline struct device_node *dev_of_node(struct device *dev)
1015 if (!IS_ENABLED(CONFIG_OF))
1017 return dev->of_node;
1020 void driver_init(void);
1023 * High level routines for use by the bus drivers
1025 extern int __must_check device_register(struct device *dev);
1026 extern void device_unregister(struct device *dev);
1027 extern void device_initialize(struct device *dev);
1028 extern int __must_check device_add(struct device *dev);
1029 extern void device_del(struct device *dev);
1030 extern int device_for_each_child(struct device *dev, void *data,
1031 int (*fn)(struct device *dev, void *data));
1032 extern int device_for_each_child_reverse(struct device *dev, void *data,
1033 int (*fn)(struct device *dev, void *data));
1034 extern struct device *device_find_child(struct device *dev, void *data,
1035 int (*match)(struct device *dev, void *data));
1036 extern int device_rename(struct device *dev, const char *new_name);
1037 extern int device_move(struct device *dev, struct device *new_parent,
1038 enum dpm_order dpm_order);
1039 extern const char *device_get_devnode(struct device *dev,
1040 umode_t *mode, kuid_t *uid, kgid_t *gid,
1043 static inline bool device_supports_offline(struct device *dev)
1045 return dev->bus && dev->bus->offline && dev->bus->online;
1048 extern void lock_device_hotplug(void);
1049 extern void unlock_device_hotplug(void);
1050 extern int lock_device_hotplug_sysfs(void);
1051 extern int device_offline(struct device *dev);
1052 extern int device_online(struct device *dev);
1053 extern void set_primary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
1054 extern void set_secondary_fwnode(struct device *dev, struct fwnode_handle *fwnode);
1057 * Root device objects for grouping under /sys/devices
1059 extern struct device *__root_device_register(const char *name,
1060 struct module *owner);
1062 /* This is a macro to avoid include problems with THIS_MODULE */
1063 #define root_device_register(name) \
1064 __root_device_register(name, THIS_MODULE)
1066 extern void root_device_unregister(struct device *root);
1068 static inline void *dev_get_platdata(const struct device *dev)
1070 return dev->platform_data;
1074 * Manual binding of a device to driver. See drivers/base/bus.c
1075 * for information on use.
1077 extern int __must_check device_bind_driver(struct device *dev);
1078 extern void device_release_driver(struct device *dev);
1079 extern int __must_check device_attach(struct device *dev);
1080 extern int __must_check driver_attach(struct device_driver *drv);
1081 extern void device_initial_probe(struct device *dev);
1082 extern int __must_check device_reprobe(struct device *dev);
1084 extern bool device_is_bound(struct device *dev);
1087 * Easy functions for dynamically creating devices on the fly
1089 extern __printf(5, 0)
1090 struct device *device_create_vargs(struct class *cls, struct device *parent,
1091 dev_t devt, void *drvdata,
1092 const char *fmt, va_list vargs);
1093 extern __printf(5, 6)
1094 struct device *device_create(struct class *cls, struct device *parent,
1095 dev_t devt, void *drvdata,
1096 const char *fmt, ...);
1097 extern __printf(6, 7)
1098 struct device *device_create_with_groups(struct class *cls,
1099 struct device *parent, dev_t devt, void *drvdata,
1100 const struct attribute_group **groups,
1101 const char *fmt, ...);
1102 extern void device_destroy(struct class *cls, dev_t devt);
1105 * Platform "fixup" functions - allow the platform to have their say
1106 * about devices and actions that the general device layer doesn't
1109 /* Notify platform of device discovery */
1110 extern int (*platform_notify)(struct device *dev);
1112 extern int (*platform_notify_remove)(struct device *dev);
1116 * get_device - atomically increment the reference count for the device.
1119 extern struct device *get_device(struct device *dev);
1120 extern void put_device(struct device *dev);
1122 #ifdef CONFIG_DEVTMPFS
1123 extern int devtmpfs_create_node(struct device *dev);
1124 extern int devtmpfs_delete_node(struct device *dev);
1125 extern int devtmpfs_mount(const char *mntdir);
1127 static inline int devtmpfs_create_node(struct device *dev) { return 0; }
1128 static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
1129 static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
1132 /* drivers/base/power/shutdown.c */
1133 extern void device_shutdown(void);
1135 /* debugging and troubleshooting/diagnostic helpers. */
1136 extern const char *dev_driver_string(const struct device *dev);
1139 #ifdef CONFIG_PRINTK
1141 extern __printf(3, 0)
1142 int dev_vprintk_emit(int level, const struct device *dev,
1143 const char *fmt, va_list args);
1144 extern __printf(3, 4)
1145 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...);
1147 extern __printf(3, 4)
1148 void dev_printk(const char *level, const struct device *dev,
1149 const char *fmt, ...);
1150 extern __printf(2, 3)
1151 void dev_emerg(const struct device *dev, const char *fmt, ...);
1152 extern __printf(2, 3)
1153 void dev_alert(const struct device *dev, const char *fmt, ...);
1154 extern __printf(2, 3)
1155 void dev_crit(const struct device *dev, const char *fmt, ...);
1156 extern __printf(2, 3)
1157 void dev_err(const struct device *dev, const char *fmt, ...);
1158 extern __printf(2, 3)
1159 void dev_warn(const struct device *dev, const char *fmt, ...);
1160 extern __printf(2, 3)
1161 void dev_notice(const struct device *dev, const char *fmt, ...);
1162 extern __printf(2, 3)
1163 void _dev_info(const struct device *dev, const char *fmt, ...);
1167 static inline __printf(3, 0)
1168 int dev_vprintk_emit(int level, const struct device *dev,
1169 const char *fmt, va_list args)
1171 static inline __printf(3, 4)
1172 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
1175 static inline void __dev_printk(const char *level, const struct device *dev,
1176 struct va_format *vaf)
1178 static inline __printf(3, 4)
1179 void dev_printk(const char *level, const struct device *dev,
1180 const char *fmt, ...)
1183 static inline __printf(2, 3)
1184 void dev_emerg(const struct device *dev, const char *fmt, ...)
1186 static inline __printf(2, 3)
1187 void dev_crit(const struct device *dev, const char *fmt, ...)
1189 static inline __printf(2, 3)
1190 void dev_alert(const struct device *dev, const char *fmt, ...)
1192 static inline __printf(2, 3)
1193 void dev_err(const struct device *dev, const char *fmt, ...)
1195 static inline __printf(2, 3)
1196 void dev_warn(const struct device *dev, const char *fmt, ...)
1198 static inline __printf(2, 3)
1199 void dev_notice(const struct device *dev, const char *fmt, ...)
1201 static inline __printf(2, 3)
1202 void _dev_info(const struct device *dev, const char *fmt, ...)
1208 * Stupid hackaround for existing uses of non-printk uses dev_info
1210 * Note that the definition of dev_info below is actually _dev_info
1211 * and a macro is used to avoid redefining dev_info
1214 #define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)
1216 #if defined(CONFIG_DYNAMIC_DEBUG)
1217 #define dev_dbg(dev, format, ...) \
1219 dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
1221 #elif defined(DEBUG)
1222 #define dev_dbg(dev, format, arg...) \
1223 dev_printk(KERN_DEBUG, dev, format, ##arg)
1225 #define dev_dbg(dev, format, arg...) \
1228 dev_printk(KERN_DEBUG, dev, format, ##arg); \
1232 #ifdef CONFIG_PRINTK
1233 #define dev_level_once(dev_level, dev, fmt, ...) \
1235 static bool __print_once __read_mostly; \
1237 if (!__print_once) { \
1238 __print_once = true; \
1239 dev_level(dev, fmt, ##__VA_ARGS__); \
1243 #define dev_level_once(dev_level, dev, fmt, ...) \
1246 dev_level(dev, fmt, ##__VA_ARGS__); \
1250 #define dev_emerg_once(dev, fmt, ...) \
1251 dev_level_once(dev_emerg, dev, fmt, ##__VA_ARGS__)
1252 #define dev_alert_once(dev, fmt, ...) \
1253 dev_level_once(dev_alert, dev, fmt, ##__VA_ARGS__)
1254 #define dev_crit_once(dev, fmt, ...) \
1255 dev_level_once(dev_crit, dev, fmt, ##__VA_ARGS__)
1256 #define dev_err_once(dev, fmt, ...) \
1257 dev_level_once(dev_err, dev, fmt, ##__VA_ARGS__)
1258 #define dev_warn_once(dev, fmt, ...) \
1259 dev_level_once(dev_warn, dev, fmt, ##__VA_ARGS__)
1260 #define dev_notice_once(dev, fmt, ...) \
1261 dev_level_once(dev_notice, dev, fmt, ##__VA_ARGS__)
1262 #define dev_info_once(dev, fmt, ...) \
1263 dev_level_once(dev_info, dev, fmt, ##__VA_ARGS__)
1264 #define dev_dbg_once(dev, fmt, ...) \
1265 dev_level_once(dev_dbg, dev, fmt, ##__VA_ARGS__)
1267 #define dev_level_ratelimited(dev_level, dev, fmt, ...) \
1269 static DEFINE_RATELIMIT_STATE(_rs, \
1270 DEFAULT_RATELIMIT_INTERVAL, \
1271 DEFAULT_RATELIMIT_BURST); \
1272 if (__ratelimit(&_rs)) \
1273 dev_level(dev, fmt, ##__VA_ARGS__); \
1276 #define dev_emerg_ratelimited(dev, fmt, ...) \
1277 dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__)
1278 #define dev_alert_ratelimited(dev, fmt, ...) \
1279 dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__)
1280 #define dev_crit_ratelimited(dev, fmt, ...) \
1281 dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__)
1282 #define dev_err_ratelimited(dev, fmt, ...) \
1283 dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__)
1284 #define dev_warn_ratelimited(dev, fmt, ...) \
1285 dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__)
1286 #define dev_notice_ratelimited(dev, fmt, ...) \
1287 dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
1288 #define dev_info_ratelimited(dev, fmt, ...) \
1289 dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
1290 #if defined(CONFIG_DYNAMIC_DEBUG)
1291 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
1292 #define dev_dbg_ratelimited(dev, fmt, ...) \
1294 static DEFINE_RATELIMIT_STATE(_rs, \
1295 DEFAULT_RATELIMIT_INTERVAL, \
1296 DEFAULT_RATELIMIT_BURST); \
1297 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
1298 if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) && \
1299 __ratelimit(&_rs)) \
1300 __dynamic_dev_dbg(&descriptor, dev, fmt, \
1303 #elif defined(DEBUG)
1304 #define dev_dbg_ratelimited(dev, fmt, ...) \
1306 static DEFINE_RATELIMIT_STATE(_rs, \
1307 DEFAULT_RATELIMIT_INTERVAL, \
1308 DEFAULT_RATELIMIT_BURST); \
1309 if (__ratelimit(&_rs)) \
1310 dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \
1313 #define dev_dbg_ratelimited(dev, fmt, ...) \
1316 dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \
1320 #ifdef VERBOSE_DEBUG
1321 #define dev_vdbg dev_dbg
1323 #define dev_vdbg(dev, format, arg...) \
1326 dev_printk(KERN_DEBUG, dev, format, ##arg); \
1331 * dev_WARN*() acts like dev_printk(), but with the key difference of
1332 * using WARN/WARN_ONCE to include file/line information and a backtrace.
1334 #define dev_WARN(dev, format, arg...) \
1335 WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg);
1337 #define dev_WARN_ONCE(dev, condition, format, arg...) \
1338 WARN_ONCE(condition, "%s %s: " format, \
1339 dev_driver_string(dev), dev_name(dev), ## arg)
1341 /* Create alias, so I can be autoloaded. */
1342 #define MODULE_ALIAS_CHARDEV(major,minor) \
1343 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
1344 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
1345 MODULE_ALIAS("char-major-" __stringify(major) "-*")
1347 #ifdef CONFIG_SYSFS_DEPRECATED
1348 extern long sysfs_deprecated;
1350 #define sysfs_deprecated 0
1354 * module_driver() - Helper macro for drivers that don't do anything
1355 * special in module init/exit. This eliminates a lot of boilerplate.
1356 * Each module may only use this macro once, and calling it replaces
1357 * module_init() and module_exit().
1359 * @__driver: driver name
1360 * @__register: register function for this driver type
1361 * @__unregister: unregister function for this driver type
1362 * @...: Additional arguments to be passed to __register and __unregister.
1364 * Use this macro to construct bus specific macros for registering
1365 * drivers, and do not use it on its own.
1367 #define module_driver(__driver, __register, __unregister, ...) \
1368 static int __init __driver##_init(void) \
1370 return __register(&(__driver) , ##__VA_ARGS__); \
1372 module_init(__driver##_init); \
1373 static void __exit __driver##_exit(void) \
1375 __unregister(&(__driver) , ##__VA_ARGS__); \
1377 module_exit(__driver##_exit);
1380 * builtin_driver() - Helper macro for drivers that don't do anything
1381 * special in init and have no exit. This eliminates some boilerplate.
1382 * Each driver may only use this macro once, and calling it replaces
1383 * device_initcall (or in some cases, the legacy __initcall). This is
1384 * meant to be a direct parallel of module_driver() above but without
1385 * the __exit stuff that is not used for builtin cases.
1387 * @__driver: driver name
1388 * @__register: register function for this driver type
1389 * @...: Additional arguments to be passed to __register
1391 * Use this macro to construct bus specific macros for registering
1392 * drivers, and do not use it on its own.
1394 #define builtin_driver(__driver, __register, ...) \
1395 static int __init __driver##_init(void) \
1397 return __register(&(__driver) , ##__VA_ARGS__); \
1399 device_initcall(__driver##_init);
1401 #endif /* _DEVICE_H_ */