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
;
45 struct bus_attribute
{
46 struct attribute attr
;
47 ssize_t (*show
)(struct bus_type
*bus
, char *buf
);
48 ssize_t (*store
)(struct bus_type
*bus
, const char *buf
, size_t count
);
51 #define BUS_ATTR(_name, _mode, _show, _store) \
52 struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
53 #define BUS_ATTR_RW(_name) \
54 struct bus_attribute bus_attr_##_name = __ATTR_RW(_name)
55 #define BUS_ATTR_RO(_name) \
56 struct bus_attribute bus_attr_##_name = __ATTR_RO(_name)
58 extern int __must_check
bus_create_file(struct bus_type
*,
59 struct bus_attribute
*);
60 extern void bus_remove_file(struct bus_type
*, struct bus_attribute
*);
63 * struct bus_type - The bus type of the device
65 * @name: The name of the bus.
66 * @dev_name: Used for subsystems to enumerate devices like ("foo%u", dev->id).
67 * @dev_root: Default device to use as the parent.
68 * @dev_attrs: Default attributes of the devices on the bus.
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 nonzero value if the
74 * given device can be handled by the given driver.
75 * @uevent: Called when a device is added, removed, or a few other things
76 * that generate uevents to add the environment variables.
77 * @probe: Called when a new device or driver add to this bus, and callback
78 * the specific driver's probe to initial the matched device.
79 * @remove: Called when a device removed from this bus.
80 * @shutdown: Called at shut-down time to quiesce the device.
82 * @online: Called to put the device back online (after offlining it).
83 * @offline: Called to put the device offline for hot-removal. May fail.
85 * @suspend: Called when a device on this bus wants to go to sleep mode.
86 * @resume: Called to bring a device on this bus out of sleep mode.
87 * @pm: Power management operations of this bus, callback the specific
88 * device driver's pm-ops.
89 * @iommu_ops: IOMMU specific operations for this bus, used to attach IOMMU
90 * driver implementations to a bus and allow the driver to do
92 * @p: The private data of the driver core, only the driver core can
94 * @lock_key: Lock class key for use by the lock validator
96 * A bus is a channel between the processor and one or more devices. For the
97 * purposes of the device model, all devices are connected via a bus, even if
98 * it is an internal, virtual, "platform" bus. Buses can plug into each other.
99 * A USB controller is usually a PCI device, for example. The device model
100 * represents the actual connections between buses and the devices they control.
101 * A bus is represented by the bus_type structure. It contains the name, the
102 * default attributes, the bus' methods, PM operations, and the driver core's
107 const char *dev_name
;
108 struct device
*dev_root
;
109 struct device_attribute
*dev_attrs
; /* use dev_groups instead */
110 const struct attribute_group
**bus_groups
;
111 const struct attribute_group
**dev_groups
;
112 const struct attribute_group
**drv_groups
;
114 int (*match
)(struct device
*dev
, struct device_driver
*drv
);
115 int (*uevent
)(struct device
*dev
, struct kobj_uevent_env
*env
);
116 int (*probe
)(struct device
*dev
);
117 int (*remove
)(struct device
*dev
);
118 void (*shutdown
)(struct device
*dev
);
120 int (*online
)(struct device
*dev
);
121 int (*offline
)(struct device
*dev
);
123 int (*suspend
)(struct device
*dev
, pm_message_t state
);
124 int (*resume
)(struct device
*dev
);
126 const struct dev_pm_ops
*pm
;
128 const struct iommu_ops
*iommu_ops
;
130 struct subsys_private
*p
;
131 struct lock_class_key lock_key
;
134 extern int __must_check
bus_register(struct bus_type
*bus
);
136 extern void bus_unregister(struct bus_type
*bus
);
138 extern int __must_check
bus_rescan_devices(struct bus_type
*bus
);
140 /* iterator helpers for buses */
141 struct subsys_dev_iter
{
142 struct klist_iter ki
;
143 const struct device_type
*type
;
145 void subsys_dev_iter_init(struct subsys_dev_iter
*iter
,
146 struct bus_type
*subsys
,
147 struct device
*start
,
148 const struct device_type
*type
);
149 struct device
*subsys_dev_iter_next(struct subsys_dev_iter
*iter
);
150 void subsys_dev_iter_exit(struct subsys_dev_iter
*iter
);
152 int bus_for_each_dev(struct bus_type
*bus
, struct device
*start
, void *data
,
153 int (*fn
)(struct device
*dev
, void *data
));
154 struct device
*bus_find_device(struct bus_type
*bus
, struct device
*start
,
156 int (*match
)(struct device
*dev
, void *data
));
157 struct device
*bus_find_device_by_name(struct bus_type
*bus
,
158 struct device
*start
,
160 struct device
*subsys_find_device_by_id(struct bus_type
*bus
, unsigned int id
,
161 struct device
*hint
);
162 int bus_for_each_drv(struct bus_type
*bus
, struct device_driver
*start
,
163 void *data
, int (*fn
)(struct device_driver
*, void *));
164 void bus_sort_breadthfirst(struct bus_type
*bus
,
165 int (*compare
)(const struct device
*a
,
166 const struct device
*b
));
168 * Bus notifiers: Get notified of addition/removal of devices
169 * and binding/unbinding of drivers to devices.
170 * In the long run, it should be a replacement for the platform
173 struct notifier_block
;
175 extern int bus_register_notifier(struct bus_type
*bus
,
176 struct notifier_block
*nb
);
177 extern int bus_unregister_notifier(struct bus_type
*bus
,
178 struct notifier_block
*nb
);
180 /* All 4 notifers below get called with the target struct device *
181 * as an argument. Note that those functions are likely to be called
182 * with the device lock held in the core, so be careful.
184 #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
185 #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device to be removed */
186 #define BUS_NOTIFY_REMOVED_DEVICE 0x00000003 /* device removed */
187 #define BUS_NOTIFY_BIND_DRIVER 0x00000004 /* driver about to be
189 #define BUS_NOTIFY_BOUND_DRIVER 0x00000005 /* driver bound to device */
190 #define BUS_NOTIFY_UNBIND_DRIVER 0x00000006 /* driver about to be
192 #define BUS_NOTIFY_UNBOUND_DRIVER 0x00000007 /* driver is unbound
194 #define BUS_NOTIFY_DRIVER_NOT_BOUND 0x00000008 /* driver fails to be bound */
196 extern struct kset
*bus_get_kset(struct bus_type
*bus
);
197 extern struct klist
*bus_get_device_klist(struct bus_type
*bus
);
200 * enum probe_type - device driver probe type to try
201 * Device drivers may opt in for special handling of their
202 * respective probe routines. This tells the core what to
205 * @PROBE_DEFAULT_STRATEGY: Used by drivers that work equally well
206 * whether probed synchronously or asynchronously.
207 * @PROBE_PREFER_ASYNCHRONOUS: Drivers for "slow" devices which
208 * probing order is not essential for booting the system may
209 * opt into executing their probes asynchronously.
210 * @PROBE_FORCE_SYNCHRONOUS: Use this to annotate drivers that need
211 * their probe routines to run synchronously with driver and
212 * device registration (with the exception of -EPROBE_DEFER
213 * handling - re-probing always ends up being done asynchronously).
215 * Note that the end goal is to switch the kernel to use asynchronous
216 * probing by default, so annotating drivers with
217 * %PROBE_PREFER_ASYNCHRONOUS is a temporary measure that allows us
218 * to speed up boot process while we are validating the rest of the
222 PROBE_DEFAULT_STRATEGY
,
223 PROBE_PREFER_ASYNCHRONOUS
,
224 PROBE_FORCE_SYNCHRONOUS
,
228 * struct device_driver - The basic device driver structure
229 * @name: Name of the device driver.
230 * @bus: The bus which the device of this driver belongs to.
231 * @owner: The module owner.
232 * @mod_name: Used for built-in modules.
233 * @suppress_bind_attrs: Disables bind/unbind via sysfs.
234 * @probe_type: Type of the probe (synchronous or asynchronous) to use.
235 * @of_match_table: The open firmware table.
236 * @acpi_match_table: The ACPI match table.
237 * @probe: Called to query the existence of a specific device,
238 * whether this driver can work with it, and bind the driver
239 * to a specific device.
240 * @remove: Called when the device is removed from the system to
241 * unbind a device from this driver.
242 * @shutdown: Called at shut-down time to quiesce the device.
243 * @suspend: Called to put the device to sleep mode. Usually to a
245 * @resume: Called to bring a device from sleep mode.
246 * @groups: Default attributes that get created by the driver core
248 * @pm: Power management operations of the device which matched
250 * @p: Driver core's private data, no one other than the driver
251 * core can touch this.
253 * The device driver-model tracks all of the drivers known to the system.
254 * The main reason for this tracking is to enable the driver core to match
255 * up drivers with new devices. Once drivers are known objects within the
256 * system, however, a number of other things become possible. Device drivers
257 * can export information and configuration variables that are independent
258 * of any specific device.
260 struct device_driver
{
262 struct bus_type
*bus
;
264 struct module
*owner
;
265 const char *mod_name
; /* used for built-in modules */
267 bool suppress_bind_attrs
; /* disables bind/unbind via sysfs */
268 enum probe_type probe_type
;
270 const struct of_device_id
*of_match_table
;
271 const struct acpi_device_id
*acpi_match_table
;
273 int (*probe
) (struct device
*dev
);
274 int (*remove
) (struct device
*dev
);
275 void (*shutdown
) (struct device
*dev
);
276 int (*suspend
) (struct device
*dev
, pm_message_t state
);
277 int (*resume
) (struct device
*dev
);
278 const struct attribute_group
**groups
;
280 const struct dev_pm_ops
*pm
;
282 struct driver_private
*p
;
286 extern int __must_check
driver_register(struct device_driver
*drv
);
287 extern void driver_unregister(struct device_driver
*drv
);
289 extern struct device_driver
*driver_find(const char *name
,
290 struct bus_type
*bus
);
291 extern int driver_probe_done(void);
292 extern void wait_for_device_probe(void);
295 /* sysfs interface for exporting driver attributes */
297 struct driver_attribute
{
298 struct attribute attr
;
299 ssize_t (*show
)(struct device_driver
*driver
, char *buf
);
300 ssize_t (*store
)(struct device_driver
*driver
, const char *buf
,
304 #define DRIVER_ATTR(_name, _mode, _show, _store) \
305 struct driver_attribute driver_attr_##_name = __ATTR(_name, _mode, _show, _store)
306 #define DRIVER_ATTR_RW(_name) \
307 struct driver_attribute driver_attr_##_name = __ATTR_RW(_name)
308 #define DRIVER_ATTR_RO(_name) \
309 struct driver_attribute driver_attr_##_name = __ATTR_RO(_name)
310 #define DRIVER_ATTR_WO(_name) \
311 struct driver_attribute driver_attr_##_name = __ATTR_WO(_name)
313 extern int __must_check
driver_create_file(struct device_driver
*driver
,
314 const struct driver_attribute
*attr
);
315 extern void driver_remove_file(struct device_driver
*driver
,
316 const struct driver_attribute
*attr
);
318 extern int __must_check
driver_for_each_device(struct device_driver
*drv
,
319 struct device
*start
,
321 int (*fn
)(struct device
*dev
,
323 struct device
*driver_find_device(struct device_driver
*drv
,
324 struct device
*start
, void *data
,
325 int (*match
)(struct device
*dev
, void *data
));
328 * struct subsys_interface - interfaces to device functions
329 * @name: name of the device function
330 * @subsys: subsytem of the devices to attach to
331 * @node: the list of functions registered at the subsystem
332 * @add_dev: device hookup to device function handler
333 * @remove_dev: device hookup to device function handler
335 * Simple interfaces attached to a subsystem. Multiple interfaces can
336 * attach to a subsystem and its devices. Unlike drivers, they do not
337 * exclusively claim or control devices. Interfaces usually represent
338 * a specific functionality of a subsystem/class of devices.
340 struct subsys_interface
{
342 struct bus_type
*subsys
;
343 struct list_head node
;
344 int (*add_dev
)(struct device
*dev
, struct subsys_interface
*sif
);
345 void (*remove_dev
)(struct device
*dev
, struct subsys_interface
*sif
);
348 int subsys_interface_register(struct subsys_interface
*sif
);
349 void subsys_interface_unregister(struct subsys_interface
*sif
);
351 int subsys_system_register(struct bus_type
*subsys
,
352 const struct attribute_group
**groups
);
353 int subsys_virtual_register(struct bus_type
*subsys
,
354 const struct attribute_group
**groups
);
357 * struct class - device classes
358 * @name: Name of the class.
359 * @owner: The module owner.
360 * @class_attrs: Default attributes of this class.
361 * @dev_groups: Default attributes of the devices that belong to the class.
362 * @dev_kobj: The kobject that represents this class and links it into the hierarchy.
363 * @dev_uevent: Called when a device is added, removed from this class, or a
364 * few other things that generate uevents to add the environment
366 * @devnode: Callback to provide the devtmpfs.
367 * @class_release: Called to release this class.
368 * @dev_release: Called to release the device.
369 * @suspend: Used to put the device to sleep mode, usually to a low power
371 * @resume: Used to bring the device from the sleep mode.
372 * @ns_type: Callbacks so sysfs can detemine namespaces.
373 * @namespace: Namespace of the device belongs to this class.
374 * @pm: The default device power management operations of this class.
375 * @p: The private data of the driver core, no one other than the
376 * driver core can touch this.
378 * A class is a higher-level view of a device that abstracts out low-level
379 * implementation details. Drivers may see a SCSI disk or an ATA disk, but,
380 * at the class level, they are all simply disks. Classes allow user space
381 * to work with devices based on what they do, rather than how they are
382 * connected or how they work.
386 struct module
*owner
;
388 struct class_attribute
*class_attrs
;
389 const struct attribute_group
**dev_groups
;
390 struct kobject
*dev_kobj
;
392 int (*dev_uevent
)(struct device
*dev
, struct kobj_uevent_env
*env
);
393 char *(*devnode
)(struct device
*dev
, umode_t
*mode
);
395 void (*class_release
)(struct class *class);
396 void (*dev_release
)(struct device
*dev
);
398 int (*suspend
)(struct device
*dev
, pm_message_t state
);
399 int (*resume
)(struct device
*dev
);
401 const struct kobj_ns_type_operations
*ns_type
;
402 const void *(*namespace)(struct device
*dev
);
404 const struct dev_pm_ops
*pm
;
406 struct subsys_private
*p
;
409 struct class_dev_iter
{
410 struct klist_iter ki
;
411 const struct device_type
*type
;
414 extern struct kobject
*sysfs_dev_block_kobj
;
415 extern struct kobject
*sysfs_dev_char_kobj
;
416 extern int __must_check
__class_register(struct class *class,
417 struct lock_class_key
*key
);
418 extern void class_unregister(struct class *class);
420 /* This is a #define to keep the compiler from merging different
421 * instances of the __key variable */
422 #define class_register(class) \
424 static struct lock_class_key __key; \
425 __class_register(class, &__key); \
429 struct class_compat
*class_compat_register(const char *name
);
430 void class_compat_unregister(struct class_compat
*cls
);
431 int class_compat_create_link(struct class_compat
*cls
, struct device
*dev
,
432 struct device
*device_link
);
433 void class_compat_remove_link(struct class_compat
*cls
, struct device
*dev
,
434 struct device
*device_link
);
436 extern void class_dev_iter_init(struct class_dev_iter
*iter
,
438 struct device
*start
,
439 const struct device_type
*type
);
440 extern struct device
*class_dev_iter_next(struct class_dev_iter
*iter
);
441 extern void class_dev_iter_exit(struct class_dev_iter
*iter
);
443 extern int class_for_each_device(struct class *class, struct device
*start
,
445 int (*fn
)(struct device
*dev
, void *data
));
446 extern struct device
*class_find_device(struct class *class,
447 struct device
*start
, const void *data
,
448 int (*match
)(struct device
*, const void *));
450 struct class_attribute
{
451 struct attribute attr
;
452 ssize_t (*show
)(struct class *class, struct class_attribute
*attr
,
454 ssize_t (*store
)(struct class *class, struct class_attribute
*attr
,
455 const char *buf
, size_t count
);
458 #define CLASS_ATTR(_name, _mode, _show, _store) \
459 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
460 #define CLASS_ATTR_RW(_name) \
461 struct class_attribute class_attr_##_name = __ATTR_RW(_name)
462 #define CLASS_ATTR_RO(_name) \
463 struct class_attribute class_attr_##_name = __ATTR_RO(_name)
465 extern int __must_check
class_create_file_ns(struct class *class,
466 const struct class_attribute
*attr
,
468 extern void class_remove_file_ns(struct class *class,
469 const struct class_attribute
*attr
,
472 static inline int __must_check
class_create_file(struct class *class,
473 const struct class_attribute
*attr
)
475 return class_create_file_ns(class, attr
, NULL
);
478 static inline void class_remove_file(struct class *class,
479 const struct class_attribute
*attr
)
481 return class_remove_file_ns(class, attr
, NULL
);
484 /* Simple class attribute that is just a static string */
485 struct class_attribute_string
{
486 struct class_attribute attr
;
490 /* Currently read-only only */
491 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
492 { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
493 #define CLASS_ATTR_STRING(_name, _mode, _str) \
494 struct class_attribute_string class_attr_##_name = \
495 _CLASS_ATTR_STRING(_name, _mode, _str)
497 extern ssize_t
show_class_attr_string(struct class *class, struct class_attribute
*attr
,
500 struct class_interface
{
501 struct list_head node
;
504 int (*add_dev
) (struct device
*, struct class_interface
*);
505 void (*remove_dev
) (struct device
*, struct class_interface
*);
508 extern int __must_check
class_interface_register(struct class_interface
*);
509 extern void class_interface_unregister(struct class_interface
*);
511 extern struct class * __must_check
__class_create(struct module
*owner
,
513 struct lock_class_key
*key
);
514 extern void class_destroy(struct class *cls
);
516 /* This is a #define to keep the compiler from merging different
517 * instances of the __key variable */
518 #define class_create(owner, name) \
520 static struct lock_class_key __key; \
521 __class_create(owner, name, &__key); \
525 * The type of device, "struct device" is embedded in. A class
526 * or bus can contain devices of different types
527 * like "partitions" and "disks", "mouse" and "event".
528 * This identifies the device type and carries type-specific
529 * information, equivalent to the kobj_type of a kobject.
530 * If "name" is specified, the uevent will contain it in
531 * the DEVTYPE variable.
535 const struct attribute_group
**groups
;
536 int (*uevent
)(struct device
*dev
, struct kobj_uevent_env
*env
);
537 char *(*devnode
)(struct device
*dev
, umode_t
*mode
,
538 kuid_t
*uid
, kgid_t
*gid
);
539 void (*release
)(struct device
*dev
);
541 const struct dev_pm_ops
*pm
;
544 /* interface for exporting device attributes */
545 struct device_attribute
{
546 struct attribute attr
;
547 ssize_t (*show
)(struct device
*dev
, struct device_attribute
*attr
,
549 ssize_t (*store
)(struct device
*dev
, struct device_attribute
*attr
,
550 const char *buf
, size_t count
);
553 struct dev_ext_attribute
{
554 struct device_attribute attr
;
558 ssize_t
device_show_ulong(struct device
*dev
, struct device_attribute
*attr
,
560 ssize_t
device_store_ulong(struct device
*dev
, struct device_attribute
*attr
,
561 const char *buf
, size_t count
);
562 ssize_t
device_show_int(struct device
*dev
, struct device_attribute
*attr
,
564 ssize_t
device_store_int(struct device
*dev
, struct device_attribute
*attr
,
565 const char *buf
, size_t count
);
566 ssize_t
device_show_bool(struct device
*dev
, struct device_attribute
*attr
,
568 ssize_t
device_store_bool(struct device
*dev
, struct device_attribute
*attr
,
569 const char *buf
, size_t count
);
571 #define DEVICE_ATTR(_name, _mode, _show, _store) \
572 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
573 #define DEVICE_ATTR_RW(_name) \
574 struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
575 #define DEVICE_ATTR_RO(_name) \
576 struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
577 #define DEVICE_ATTR_WO(_name) \
578 struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
579 #define DEVICE_ULONG_ATTR(_name, _mode, _var) \
580 struct dev_ext_attribute dev_attr_##_name = \
581 { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
582 #define DEVICE_INT_ATTR(_name, _mode, _var) \
583 struct dev_ext_attribute dev_attr_##_name = \
584 { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
585 #define DEVICE_BOOL_ATTR(_name, _mode, _var) \
586 struct dev_ext_attribute dev_attr_##_name = \
587 { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
588 #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
589 struct device_attribute dev_attr_##_name = \
590 __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
592 extern int device_create_file(struct device
*device
,
593 const struct device_attribute
*entry
);
594 extern void device_remove_file(struct device
*dev
,
595 const struct device_attribute
*attr
);
596 extern bool device_remove_file_self(struct device
*dev
,
597 const struct device_attribute
*attr
);
598 extern int __must_check
device_create_bin_file(struct device
*dev
,
599 const struct bin_attribute
*attr
);
600 extern void device_remove_bin_file(struct device
*dev
,
601 const struct bin_attribute
*attr
);
603 /* device resource management */
604 typedef void (*dr_release_t
)(struct device
*dev
, void *res
);
605 typedef int (*dr_match_t
)(struct device
*dev
, void *res
, void *match_data
);
607 #ifdef CONFIG_DEBUG_DEVRES
608 extern void *__devres_alloc_node(dr_release_t release
, size_t size
, gfp_t gfp
,
609 int nid
, const char *name
);
610 #define devres_alloc(release, size, gfp) \
611 __devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release)
612 #define devres_alloc_node(release, size, gfp, nid) \
613 __devres_alloc_node(release, size, gfp, nid, #release)
615 extern void *devres_alloc_node(dr_release_t release
, size_t size
, gfp_t gfp
,
617 static inline void *devres_alloc(dr_release_t release
, size_t size
, gfp_t gfp
)
619 return devres_alloc_node(release
, size
, gfp
, NUMA_NO_NODE
);
623 extern void devres_for_each_res(struct device
*dev
, dr_release_t release
,
624 dr_match_t match
, void *match_data
,
625 void (*fn
)(struct device
*, void *, void *),
627 extern void devres_free(void *res
);
628 extern void devres_add(struct device
*dev
, void *res
);
629 extern void *devres_find(struct device
*dev
, dr_release_t release
,
630 dr_match_t match
, void *match_data
);
631 extern void *devres_get(struct device
*dev
, void *new_res
,
632 dr_match_t match
, void *match_data
);
633 extern void *devres_remove(struct device
*dev
, dr_release_t release
,
634 dr_match_t match
, void *match_data
);
635 extern int devres_destroy(struct device
*dev
, dr_release_t release
,
636 dr_match_t match
, void *match_data
);
637 extern int devres_release(struct device
*dev
, dr_release_t release
,
638 dr_match_t match
, void *match_data
);
641 extern void * __must_check
devres_open_group(struct device
*dev
, void *id
,
643 extern void devres_close_group(struct device
*dev
, void *id
);
644 extern void devres_remove_group(struct device
*dev
, void *id
);
645 extern int devres_release_group(struct device
*dev
, void *id
);
647 /* managed devm_k.alloc/kfree for device drivers */
648 extern void *devm_kmalloc(struct device
*dev
, size_t size
, gfp_t gfp
);
649 extern __printf(3, 0)
650 char *devm_kvasprintf(struct device
*dev
, gfp_t gfp
, const char *fmt
,
652 extern __printf(3, 4)
653 char *devm_kasprintf(struct device
*dev
, gfp_t gfp
, const char *fmt
, ...);
654 static inline void *devm_kzalloc(struct device
*dev
, size_t size
, gfp_t gfp
)
656 return devm_kmalloc(dev
, size
, gfp
| __GFP_ZERO
);
658 static inline void *devm_kmalloc_array(struct device
*dev
,
659 size_t n
, size_t size
, gfp_t flags
)
661 if (size
!= 0 && n
> SIZE_MAX
/ size
)
663 return devm_kmalloc(dev
, n
* size
, flags
);
665 static inline void *devm_kcalloc(struct device
*dev
,
666 size_t n
, size_t size
, gfp_t flags
)
668 return devm_kmalloc_array(dev
, n
, size
, flags
| __GFP_ZERO
);
670 extern void devm_kfree(struct device
*dev
, void *p
);
671 extern char *devm_kstrdup(struct device
*dev
, const char *s
, gfp_t gfp
);
672 extern void *devm_kmemdup(struct device
*dev
, const void *src
, size_t len
,
675 extern unsigned long devm_get_free_pages(struct device
*dev
,
676 gfp_t gfp_mask
, unsigned int order
);
677 extern void devm_free_pages(struct device
*dev
, unsigned long addr
);
679 void __iomem
*devm_ioremap_resource(struct device
*dev
, struct resource
*res
);
681 /* allows to add/remove a custom action to devres stack */
682 int devm_add_action(struct device
*dev
, void (*action
)(void *), void *data
);
683 void devm_remove_action(struct device
*dev
, void (*action
)(void *), void *data
);
685 struct device_dma_parameters
{
687 * a low level driver may set these to teach IOMMU code about
690 unsigned int max_segment_size
;
691 unsigned long segment_boundary_mask
;
695 * struct device - The basic device structure
696 * @parent: The device's "parent" device, the device to which it is attached.
697 * In most cases, a parent device is some sort of bus or host
698 * controller. If parent is NULL, the device, is a top-level device,
699 * which is not usually what you want.
700 * @p: Holds the private data of the driver core portions of the device.
701 * See the comment of the struct device_private for detail.
702 * @kobj: A top-level, abstract class from which other classes are derived.
703 * @init_name: Initial name of the device.
704 * @type: The type of device.
705 * This identifies the device type and carries type-specific
707 * @mutex: Mutex to synchronize calls to its driver.
708 * @bus: Type of bus device is on.
709 * @driver: Which driver has allocated this
710 * @platform_data: Platform data specific to the device.
711 * Example: For devices on custom boards, as typical of embedded
712 * and SOC based hardware, Linux often uses platform_data to point
713 * to board-specific structures describing devices and how they
714 * are wired. That can include what ports are available, chip
715 * variants, which GPIO pins act in what additional roles, and so
716 * on. This shrinks the "Board Support Packages" (BSPs) and
717 * minimizes board-specific #ifdefs in drivers.
718 * @driver_data: Private pointer for driver specific info.
719 * @power: For device power management.
720 * See Documentation/power/devices.txt for details.
721 * @pm_domain: Provide callbacks that are executed during system suspend,
722 * hibernation, system resume and during runtime PM transitions
723 * along with subsystem-level and driver-level callbacks.
724 * @pins: For device pin management.
725 * See Documentation/pinctrl.txt for details.
726 * @msi_list: Hosts MSI descriptors
727 * @msi_domain: The generic MSI domain this device is using.
728 * @numa_node: NUMA node this device is close to.
729 * @dma_mask: Dma mask (if dma'ble device).
730 * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
731 * hardware supports 64-bit addresses for consistent allocations
733 * @dma_pfn_offset: offset of DMA memory range relatively of RAM
734 * @dma_parms: A low level driver may set these to teach IOMMU code about
735 * segment limitations.
736 * @dma_pools: Dma pools (if dma'ble device).
737 * @dma_mem: Internal for coherent mem override.
738 * @cma_area: Contiguous memory area for dma allocations
739 * @archdata: For arch-specific additions.
740 * @of_node: Associated device tree node.
741 * @fwnode: Associated device node supplied by platform firmware.
742 * @devt: For creating the sysfs "dev".
743 * @id: device instance
744 * @devres_lock: Spinlock to protect the resource of the device.
745 * @devres_head: The resources list of the device.
746 * @knode_class: The node used to add the device to the class list.
747 * @class: The class of the device.
748 * @groups: Optional attribute groups.
749 * @release: Callback to free the device after all references have
750 * gone away. This should be set by the allocator of the
751 * device (i.e. the bus driver that discovered the device).
752 * @iommu_group: IOMMU group the device belongs to.
754 * @offline_disabled: If set, the device is permanently online.
755 * @offline: Set after successful invocation of bus type's .offline().
757 * At the lowest level, every device in a Linux system is represented by an
758 * instance of struct device. The device structure contains the information
759 * that the device model core needs to model the system. Most subsystems,
760 * however, track additional information about the devices they host. As a
761 * result, it is rare for devices to be represented by bare device structures;
762 * instead, that structure, like kobject structures, is usually embedded within
763 * a higher-level representation of the device.
766 struct device
*parent
;
768 struct device_private
*p
;
771 const char *init_name
; /* initial name of the device */
772 const struct device_type
*type
;
774 struct mutex mutex
; /* mutex to synchronize calls to
778 struct bus_type
*bus
; /* type of bus device is on */
779 struct device_driver
*driver
; /* which driver has allocated this
781 void *platform_data
; /* Platform specific data, device
782 core doesn't touch it */
783 void *driver_data
; /* Driver data, set and get with
784 dev_set/get_drvdata */
785 struct dev_pm_info power
;
786 struct dev_pm_domain
*pm_domain
;
788 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
789 struct irq_domain
*msi_domain
;
791 #ifdef CONFIG_PINCTRL
792 struct dev_pin_info
*pins
;
794 #ifdef CONFIG_GENERIC_MSI_IRQ
795 struct list_head msi_list
;
799 int numa_node
; /* NUMA node this device is close to */
801 u64
*dma_mask
; /* dma mask (if dma'able device) */
802 u64 coherent_dma_mask
;/* Like dma_mask, but for
803 alloc_coherent mappings as
804 not all hardware supports
805 64 bit addresses for consistent
806 allocations such descriptors. */
807 unsigned long dma_pfn_offset
;
809 struct device_dma_parameters
*dma_parms
;
811 struct list_head dma_pools
; /* dma pools (if dma'ble) */
813 struct dma_coherent_mem
*dma_mem
; /* internal for coherent mem
815 #ifdef CONFIG_DMA_CMA
816 struct cma
*cma_area
; /* contiguous memory area for dma
819 /* arch specific additions */
820 struct dev_archdata archdata
;
822 struct device_node
*of_node
; /* associated device tree node */
823 struct fwnode_handle
*fwnode
; /* firmware device node */
825 dev_t devt
; /* dev_t, creates the sysfs "dev" */
826 u32 id
; /* device instance */
828 spinlock_t devres_lock
;
829 struct list_head devres_head
;
831 struct klist_node knode_class
;
833 const struct attribute_group
**groups
; /* optional groups */
835 void (*release
)(struct device
*dev
);
836 struct iommu_group
*iommu_group
;
838 bool offline_disabled
:1;
842 static inline struct device
*kobj_to_dev(struct kobject
*kobj
)
844 return container_of(kobj
, struct device
, kobj
);
847 /* Get the wakeup routines, which depend on struct device */
848 #include <linux/pm_wakeup.h>
850 static inline const char *dev_name(const struct device
*dev
)
852 /* Use the init name until the kobject becomes available */
854 return dev
->init_name
;
856 return kobject_name(&dev
->kobj
);
859 extern __printf(2, 3)
860 int dev_set_name(struct device
*dev
, const char *name
, ...);
863 static inline int dev_to_node(struct device
*dev
)
865 return dev
->numa_node
;
867 static inline void set_dev_node(struct device
*dev
, int node
)
869 dev
->numa_node
= node
;
872 static inline int dev_to_node(struct device
*dev
)
876 static inline void set_dev_node(struct device
*dev
, int node
)
881 static inline struct irq_domain
*dev_get_msi_domain(const struct device
*dev
)
883 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
884 return dev
->msi_domain
;
890 static inline void dev_set_msi_domain(struct device
*dev
, struct irq_domain
*d
)
892 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
897 static inline void *dev_get_drvdata(const struct device
*dev
)
899 return dev
->driver_data
;
902 static inline void dev_set_drvdata(struct device
*dev
, void *data
)
904 dev
->driver_data
= data
;
907 static inline struct pm_subsys_data
*dev_to_psd(struct device
*dev
)
909 return dev
? dev
->power
.subsys_data
: NULL
;
912 static inline unsigned int dev_get_uevent_suppress(const struct device
*dev
)
914 return dev
->kobj
.uevent_suppress
;
917 static inline void dev_set_uevent_suppress(struct device
*dev
, int val
)
919 dev
->kobj
.uevent_suppress
= val
;
922 static inline int device_is_registered(struct device
*dev
)
924 return dev
->kobj
.state_in_sysfs
;
927 static inline void device_enable_async_suspend(struct device
*dev
)
929 if (!dev
->power
.is_prepared
)
930 dev
->power
.async_suspend
= true;
933 static inline void device_disable_async_suspend(struct device
*dev
)
935 if (!dev
->power
.is_prepared
)
936 dev
->power
.async_suspend
= false;
939 static inline bool device_async_suspend_enabled(struct device
*dev
)
941 return !!dev
->power
.async_suspend
;
944 static inline void pm_suspend_ignore_children(struct device
*dev
, bool enable
)
946 dev
->power
.ignore_children
= enable
;
949 static inline void dev_pm_syscore_device(struct device
*dev
, bool val
)
951 #ifdef CONFIG_PM_SLEEP
952 dev
->power
.syscore
= val
;
956 static inline void device_lock(struct device
*dev
)
958 mutex_lock(&dev
->mutex
);
961 static inline int device_trylock(struct device
*dev
)
963 return mutex_trylock(&dev
->mutex
);
966 static inline void device_unlock(struct device
*dev
)
968 mutex_unlock(&dev
->mutex
);
971 static inline void device_lock_assert(struct device
*dev
)
973 lockdep_assert_held(&dev
->mutex
);
976 static inline struct device_node
*dev_of_node(struct device
*dev
)
978 if (!IS_ENABLED(CONFIG_OF
))
983 void driver_init(void);
986 * High level routines for use by the bus drivers
988 extern int __must_check
device_register(struct device
*dev
);
989 extern void device_unregister(struct device
*dev
);
990 extern void device_initialize(struct device
*dev
);
991 extern int __must_check
device_add(struct device
*dev
);
992 extern void device_del(struct device
*dev
);
993 extern int device_for_each_child(struct device
*dev
, void *data
,
994 int (*fn
)(struct device
*dev
, void *data
));
995 extern int device_for_each_child_reverse(struct device
*dev
, void *data
,
996 int (*fn
)(struct device
*dev
, void *data
));
997 extern struct device
*device_find_child(struct device
*dev
, void *data
,
998 int (*match
)(struct device
*dev
, void *data
));
999 extern int device_rename(struct device
*dev
, const char *new_name
);
1000 extern int device_move(struct device
*dev
, struct device
*new_parent
,
1001 enum dpm_order dpm_order
);
1002 extern const char *device_get_devnode(struct device
*dev
,
1003 umode_t
*mode
, kuid_t
*uid
, kgid_t
*gid
,
1006 static inline bool device_supports_offline(struct device
*dev
)
1008 return dev
->bus
&& dev
->bus
->offline
&& dev
->bus
->online
;
1011 extern void lock_device_hotplug(void);
1012 extern void unlock_device_hotplug(void);
1013 extern int lock_device_hotplug_sysfs(void);
1014 extern int device_offline(struct device
*dev
);
1015 extern int device_online(struct device
*dev
);
1016 extern void set_primary_fwnode(struct device
*dev
, struct fwnode_handle
*fwnode
);
1017 extern void set_secondary_fwnode(struct device
*dev
, struct fwnode_handle
*fwnode
);
1020 * Root device objects for grouping under /sys/devices
1022 extern struct device
*__root_device_register(const char *name
,
1023 struct module
*owner
);
1025 /* This is a macro to avoid include problems with THIS_MODULE */
1026 #define root_device_register(name) \
1027 __root_device_register(name, THIS_MODULE)
1029 extern void root_device_unregister(struct device
*root
);
1031 static inline void *dev_get_platdata(const struct device
*dev
)
1033 return dev
->platform_data
;
1037 * Manual binding of a device to driver. See drivers/base/bus.c
1038 * for information on use.
1040 extern int __must_check
device_bind_driver(struct device
*dev
);
1041 extern void device_release_driver(struct device
*dev
);
1042 extern int __must_check
device_attach(struct device
*dev
);
1043 extern int __must_check
driver_attach(struct device_driver
*drv
);
1044 extern void device_initial_probe(struct device
*dev
);
1045 extern int __must_check
device_reprobe(struct device
*dev
);
1047 extern bool device_is_bound(struct device
*dev
);
1050 * Easy functions for dynamically creating devices on the fly
1052 extern __printf(5, 0)
1053 struct device
*device_create_vargs(struct class *cls
, struct device
*parent
,
1054 dev_t devt
, void *drvdata
,
1055 const char *fmt
, va_list vargs
);
1056 extern __printf(5, 6)
1057 struct device
*device_create(struct class *cls
, struct device
*parent
,
1058 dev_t devt
, void *drvdata
,
1059 const char *fmt
, ...);
1060 extern __printf(6, 7)
1061 struct device
*device_create_with_groups(struct class *cls
,
1062 struct device
*parent
, dev_t devt
, void *drvdata
,
1063 const struct attribute_group
**groups
,
1064 const char *fmt
, ...);
1065 extern void device_destroy(struct class *cls
, dev_t devt
);
1068 * Platform "fixup" functions - allow the platform to have their say
1069 * about devices and actions that the general device layer doesn't
1072 /* Notify platform of device discovery */
1073 extern int (*platform_notify
)(struct device
*dev
);
1075 extern int (*platform_notify_remove
)(struct device
*dev
);
1079 * get_device - atomically increment the reference count for the device.
1082 extern struct device
*get_device(struct device
*dev
);
1083 extern void put_device(struct device
*dev
);
1085 #ifdef CONFIG_DEVTMPFS
1086 extern int devtmpfs_create_node(struct device
*dev
);
1087 extern int devtmpfs_delete_node(struct device
*dev
);
1088 extern int devtmpfs_mount(const char *mntdir
);
1090 static inline int devtmpfs_create_node(struct device
*dev
) { return 0; }
1091 static inline int devtmpfs_delete_node(struct device
*dev
) { return 0; }
1092 static inline int devtmpfs_mount(const char *mountpoint
) { return 0; }
1095 /* drivers/base/power/shutdown.c */
1096 extern void device_shutdown(void);
1098 /* debugging and troubleshooting/diagnostic helpers. */
1099 extern const char *dev_driver_string(const struct device
*dev
);
1102 #ifdef CONFIG_PRINTK
1104 extern __printf(3, 0)
1105 int dev_vprintk_emit(int level
, const struct device
*dev
,
1106 const char *fmt
, va_list args
);
1107 extern __printf(3, 4)
1108 int dev_printk_emit(int level
, const struct device
*dev
, const char *fmt
, ...);
1110 extern __printf(3, 4)
1111 void dev_printk(const char *level
, const struct device
*dev
,
1112 const char *fmt
, ...);
1113 extern __printf(2, 3)
1114 void dev_emerg(const struct device
*dev
, const char *fmt
, ...);
1115 extern __printf(2, 3)
1116 void dev_alert(const struct device
*dev
, const char *fmt
, ...);
1117 extern __printf(2, 3)
1118 void dev_crit(const struct device
*dev
, const char *fmt
, ...);
1119 extern __printf(2, 3)
1120 void dev_err(const struct device
*dev
, const char *fmt
, ...);
1121 extern __printf(2, 3)
1122 void dev_warn(const struct device
*dev
, const char *fmt
, ...);
1123 extern __printf(2, 3)
1124 void dev_notice(const struct device
*dev
, const char *fmt
, ...);
1125 extern __printf(2, 3)
1126 void _dev_info(const struct device
*dev
, const char *fmt
, ...);
1130 static inline __printf(3, 0)
1131 int dev_vprintk_emit(int level
, const struct device
*dev
,
1132 const char *fmt
, va_list args
)
1134 static inline __printf(3, 4)
1135 int dev_printk_emit(int level
, const struct device
*dev
, const char *fmt
, ...)
1138 static inline void __dev_printk(const char *level
, const struct device
*dev
,
1139 struct va_format
*vaf
)
1141 static inline __printf(3, 4)
1142 void dev_printk(const char *level
, const struct device
*dev
,
1143 const char *fmt
, ...)
1146 static inline __printf(2, 3)
1147 void dev_emerg(const struct device
*dev
, const char *fmt
, ...)
1149 static inline __printf(2, 3)
1150 void dev_crit(const struct device
*dev
, const char *fmt
, ...)
1152 static inline __printf(2, 3)
1153 void dev_alert(const struct device
*dev
, const char *fmt
, ...)
1155 static inline __printf(2, 3)
1156 void dev_err(const struct device
*dev
, const char *fmt
, ...)
1158 static inline __printf(2, 3)
1159 void dev_warn(const struct device
*dev
, const char *fmt
, ...)
1161 static inline __printf(2, 3)
1162 void dev_notice(const struct device
*dev
, const char *fmt
, ...)
1164 static inline __printf(2, 3)
1165 void _dev_info(const struct device
*dev
, const char *fmt
, ...)
1171 * Stupid hackaround for existing uses of non-printk uses dev_info
1173 * Note that the definition of dev_info below is actually _dev_info
1174 * and a macro is used to avoid redefining dev_info
1177 #define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)
1179 #if defined(CONFIG_DYNAMIC_DEBUG)
1180 #define dev_dbg(dev, format, ...) \
1182 dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
1184 #elif defined(DEBUG)
1185 #define dev_dbg(dev, format, arg...) \
1186 dev_printk(KERN_DEBUG, dev, format, ##arg)
1188 #define dev_dbg(dev, format, arg...) \
1191 dev_printk(KERN_DEBUG, dev, format, ##arg); \
1195 #ifdef CONFIG_PRINTK
1196 #define dev_level_once(dev_level, dev, fmt, ...) \
1198 static bool __print_once __read_mostly; \
1200 if (!__print_once) { \
1201 __print_once = true; \
1202 dev_level(dev, fmt, ##__VA_ARGS__); \
1206 #define dev_level_once(dev_level, dev, fmt, ...) \
1209 dev_level(dev, fmt, ##__VA_ARGS__); \
1213 #define dev_emerg_once(dev, fmt, ...) \
1214 dev_level_once(dev_emerg, dev, fmt, ##__VA_ARGS__)
1215 #define dev_alert_once(dev, fmt, ...) \
1216 dev_level_once(dev_alert, dev, fmt, ##__VA_ARGS__)
1217 #define dev_crit_once(dev, fmt, ...) \
1218 dev_level_once(dev_crit, dev, fmt, ##__VA_ARGS__)
1219 #define dev_err_once(dev, fmt, ...) \
1220 dev_level_once(dev_err, dev, fmt, ##__VA_ARGS__)
1221 #define dev_warn_once(dev, fmt, ...) \
1222 dev_level_once(dev_warn, dev, fmt, ##__VA_ARGS__)
1223 #define dev_notice_once(dev, fmt, ...) \
1224 dev_level_once(dev_notice, dev, fmt, ##__VA_ARGS__)
1225 #define dev_info_once(dev, fmt, ...) \
1226 dev_level_once(dev_info, dev, fmt, ##__VA_ARGS__)
1227 #define dev_dbg_once(dev, fmt, ...) \
1228 dev_level_once(dev_dbg, dev, fmt, ##__VA_ARGS__)
1230 #define dev_level_ratelimited(dev_level, dev, fmt, ...) \
1232 static DEFINE_RATELIMIT_STATE(_rs, \
1233 DEFAULT_RATELIMIT_INTERVAL, \
1234 DEFAULT_RATELIMIT_BURST); \
1235 if (__ratelimit(&_rs)) \
1236 dev_level(dev, fmt, ##__VA_ARGS__); \
1239 #define dev_emerg_ratelimited(dev, fmt, ...) \
1240 dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__)
1241 #define dev_alert_ratelimited(dev, fmt, ...) \
1242 dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__)
1243 #define dev_crit_ratelimited(dev, fmt, ...) \
1244 dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__)
1245 #define dev_err_ratelimited(dev, fmt, ...) \
1246 dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__)
1247 #define dev_warn_ratelimited(dev, fmt, ...) \
1248 dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__)
1249 #define dev_notice_ratelimited(dev, fmt, ...) \
1250 dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
1251 #define dev_info_ratelimited(dev, fmt, ...) \
1252 dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
1253 #if defined(CONFIG_DYNAMIC_DEBUG)
1254 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
1255 #define dev_dbg_ratelimited(dev, fmt, ...) \
1257 static DEFINE_RATELIMIT_STATE(_rs, \
1258 DEFAULT_RATELIMIT_INTERVAL, \
1259 DEFAULT_RATELIMIT_BURST); \
1260 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
1261 if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) && \
1262 __ratelimit(&_rs)) \
1263 __dynamic_dev_dbg(&descriptor, dev, fmt, \
1266 #elif defined(DEBUG)
1267 #define dev_dbg_ratelimited(dev, fmt, ...) \
1269 static DEFINE_RATELIMIT_STATE(_rs, \
1270 DEFAULT_RATELIMIT_INTERVAL, \
1271 DEFAULT_RATELIMIT_BURST); \
1272 if (__ratelimit(&_rs)) \
1273 dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \
1276 #define dev_dbg_ratelimited(dev, fmt, ...) \
1277 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
1280 #ifdef VERBOSE_DEBUG
1281 #define dev_vdbg dev_dbg
1283 #define dev_vdbg(dev, format, arg...) \
1286 dev_printk(KERN_DEBUG, dev, format, ##arg); \
1291 * dev_WARN*() acts like dev_printk(), but with the key difference of
1292 * using WARN/WARN_ONCE to include file/line information and a backtrace.
1294 #define dev_WARN(dev, format, arg...) \
1295 WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg);
1297 #define dev_WARN_ONCE(dev, condition, format, arg...) \
1298 WARN_ONCE(condition, "%s %s: " format, \
1299 dev_driver_string(dev), dev_name(dev), ## arg)
1301 /* Create alias, so I can be autoloaded. */
1302 #define MODULE_ALIAS_CHARDEV(major,minor) \
1303 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
1304 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
1305 MODULE_ALIAS("char-major-" __stringify(major) "-*")
1307 #ifdef CONFIG_SYSFS_DEPRECATED
1308 extern long sysfs_deprecated
;
1310 #define sysfs_deprecated 0
1314 * module_driver() - Helper macro for drivers that don't do anything
1315 * special in module init/exit. This eliminates a lot of boilerplate.
1316 * Each module may only use this macro once, and calling it replaces
1317 * module_init() and module_exit().
1319 * @__driver: driver name
1320 * @__register: register function for this driver type
1321 * @__unregister: unregister function for this driver type
1322 * @...: Additional arguments to be passed to __register and __unregister.
1324 * Use this macro to construct bus specific macros for registering
1325 * drivers, and do not use it on its own.
1327 #define module_driver(__driver, __register, __unregister, ...) \
1328 static int __init __driver##_init(void) \
1330 return __register(&(__driver) , ##__VA_ARGS__); \
1332 module_init(__driver##_init); \
1333 static void __exit __driver##_exit(void) \
1335 __unregister(&(__driver) , ##__VA_ARGS__); \
1337 module_exit(__driver##_exit);
1340 * builtin_driver() - Helper macro for drivers that don't do anything
1341 * special in init and have no exit. This eliminates some boilerplate.
1342 * Each driver may only use this macro once, and calling it replaces
1343 * device_initcall (or in some cases, the legacy __initcall). This is
1344 * meant to be a direct parallel of module_driver() above but without
1345 * the __exit stuff that is not used for builtin cases.
1347 * @__driver: driver name
1348 * @__register: register function for this driver type
1349 * @...: Additional arguments to be passed to __register
1351 * Use this macro to construct bus specific macros for registering
1352 * drivers, and do not use it on its own.
1354 #define builtin_driver(__driver, __register, ...) \
1355 static int __init __driver##_init(void) \
1357 return __register(&(__driver) , ##__VA_ARGS__); \
1359 device_initcall(__driver##_init);
1361 #endif /* _DEVICE_H_ */