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 positive value if the
74 * given device can be handled by the given driver and zero
75 * otherwise. It may also return error code if determining that
76 * the driver supports the device is not possible. In case of
77 * -EPROBE_DEFER it will queue the device for deferred probing.
78 * @uevent: Called when a device is added, removed, or a few other things
79 * that generate uevents to add the environment variables.
80 * @probe: Called when a new device or driver add to this bus, and callback
81 * the specific driver's probe to initial the matched device.
82 * @remove: Called when a device removed from this bus.
83 * @shutdown: Called at shut-down time to quiesce the device.
85 * @online: Called to put the device back online (after offlining it).
86 * @offline: Called to put the device offline for hot-removal. May fail.
88 * @suspend: Called when a device on this bus wants to go to sleep mode.
89 * @resume: Called to bring a device on this bus out of sleep mode.
90 * @pm: Power management operations of this bus, callback the specific
91 * device driver's pm-ops.
92 * @iommu_ops: IOMMU specific operations for this bus, used to attach IOMMU
93 * driver implementations to a bus and allow the driver to do
95 * @p: The private data of the driver core, only the driver core can
97 * @lock_key: Lock class key for use by the lock validator
99 * A bus is a channel between the processor and one or more devices. For the
100 * purposes of the device model, all devices are connected via a bus, even if
101 * it is an internal, virtual, "platform" bus. Buses can plug into each other.
102 * A USB controller is usually a PCI device, for example. The device model
103 * represents the actual connections between buses and the devices they control.
104 * A bus is represented by the bus_type structure. It contains the name, the
105 * default attributes, the bus' methods, PM operations, and the driver core's
110 const char *dev_name
;
111 struct device
*dev_root
;
112 struct device_attribute
*dev_attrs
; /* use dev_groups instead */
113 const struct attribute_group
**bus_groups
;
114 const struct attribute_group
**dev_groups
;
115 const struct attribute_group
**drv_groups
;
117 int (*match
)(struct device
*dev
, struct device_driver
*drv
);
118 int (*uevent
)(struct device
*dev
, struct kobj_uevent_env
*env
);
119 int (*probe
)(struct device
*dev
);
120 int (*remove
)(struct device
*dev
);
121 void (*shutdown
)(struct device
*dev
);
123 int (*online
)(struct device
*dev
);
124 int (*offline
)(struct device
*dev
);
126 int (*suspend
)(struct device
*dev
, pm_message_t state
);
127 int (*resume
)(struct device
*dev
);
129 const struct dev_pm_ops
*pm
;
131 const struct iommu_ops
*iommu_ops
;
133 struct subsys_private
*p
;
134 struct lock_class_key lock_key
;
137 extern int __must_check
bus_register(struct bus_type
*bus
);
139 extern void bus_unregister(struct bus_type
*bus
);
141 extern int __must_check
bus_rescan_devices(struct bus_type
*bus
);
143 /* iterator helpers for buses */
144 struct subsys_dev_iter
{
145 struct klist_iter ki
;
146 const struct device_type
*type
;
148 void subsys_dev_iter_init(struct subsys_dev_iter
*iter
,
149 struct bus_type
*subsys
,
150 struct device
*start
,
151 const struct device_type
*type
);
152 struct device
*subsys_dev_iter_next(struct subsys_dev_iter
*iter
);
153 void subsys_dev_iter_exit(struct subsys_dev_iter
*iter
);
155 int bus_for_each_dev(struct bus_type
*bus
, struct device
*start
, void *data
,
156 int (*fn
)(struct device
*dev
, void *data
));
157 struct device
*bus_find_device(struct bus_type
*bus
, struct device
*start
,
159 int (*match
)(struct device
*dev
, void *data
));
160 struct device
*bus_find_device_by_name(struct bus_type
*bus
,
161 struct device
*start
,
163 struct device
*subsys_find_device_by_id(struct bus_type
*bus
, unsigned int id
,
164 struct device
*hint
);
165 int bus_for_each_drv(struct bus_type
*bus
, struct device_driver
*start
,
166 void *data
, int (*fn
)(struct device_driver
*, void *));
167 void bus_sort_breadthfirst(struct bus_type
*bus
,
168 int (*compare
)(const struct device
*a
,
169 const struct device
*b
));
171 * Bus notifiers: Get notified of addition/removal of devices
172 * and binding/unbinding of drivers to devices.
173 * In the long run, it should be a replacement for the platform
176 struct notifier_block
;
178 extern int bus_register_notifier(struct bus_type
*bus
,
179 struct notifier_block
*nb
);
180 extern int bus_unregister_notifier(struct bus_type
*bus
,
181 struct notifier_block
*nb
);
183 /* All 4 notifers below get called with the target struct device *
184 * as an argument. Note that those functions are likely to be called
185 * with the device lock held in the core, so be careful.
187 #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
188 #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device to be removed */
189 #define BUS_NOTIFY_REMOVED_DEVICE 0x00000003 /* device removed */
190 #define BUS_NOTIFY_BIND_DRIVER 0x00000004 /* driver about to be
192 #define BUS_NOTIFY_BOUND_DRIVER 0x00000005 /* driver bound to device */
193 #define BUS_NOTIFY_UNBIND_DRIVER 0x00000006 /* driver about to be
195 #define BUS_NOTIFY_UNBOUND_DRIVER 0x00000007 /* driver is unbound
197 #define BUS_NOTIFY_DRIVER_NOT_BOUND 0x00000008 /* driver fails to be bound */
199 extern struct kset
*bus_get_kset(struct bus_type
*bus
);
200 extern struct klist
*bus_get_device_klist(struct bus_type
*bus
);
203 * enum probe_type - device driver probe type to try
204 * Device drivers may opt in for special handling of their
205 * respective probe routines. This tells the core what to
208 * @PROBE_DEFAULT_STRATEGY: Used by drivers that work equally well
209 * whether probed synchronously or asynchronously.
210 * @PROBE_PREFER_ASYNCHRONOUS: Drivers for "slow" devices which
211 * probing order is not essential for booting the system may
212 * opt into executing their probes asynchronously.
213 * @PROBE_FORCE_SYNCHRONOUS: Use this to annotate drivers that need
214 * their probe routines to run synchronously with driver and
215 * device registration (with the exception of -EPROBE_DEFER
216 * handling - re-probing always ends up being done asynchronously).
218 * Note that the end goal is to switch the kernel to use asynchronous
219 * probing by default, so annotating drivers with
220 * %PROBE_PREFER_ASYNCHRONOUS is a temporary measure that allows us
221 * to speed up boot process while we are validating the rest of the
225 PROBE_DEFAULT_STRATEGY
,
226 PROBE_PREFER_ASYNCHRONOUS
,
227 PROBE_FORCE_SYNCHRONOUS
,
231 * struct device_driver - The basic device driver structure
232 * @name: Name of the device driver.
233 * @bus: The bus which the device of this driver belongs to.
234 * @owner: The module owner.
235 * @mod_name: Used for built-in modules.
236 * @suppress_bind_attrs: Disables bind/unbind via sysfs.
237 * @probe_type: Type of the probe (synchronous or asynchronous) to use.
238 * @of_match_table: The open firmware table.
239 * @acpi_match_table: The ACPI match table.
240 * @probe: Called to query the existence of a specific device,
241 * whether this driver can work with it, and bind the driver
242 * to a specific device.
243 * @remove: Called when the device is removed from the system to
244 * unbind a device from this driver.
245 * @shutdown: Called at shut-down time to quiesce the device.
246 * @suspend: Called to put the device to sleep mode. Usually to a
248 * @resume: Called to bring a device from sleep mode.
249 * @groups: Default attributes that get created by the driver core
251 * @pm: Power management operations of the device which matched
253 * @p: Driver core's private data, no one other than the driver
254 * core can touch this.
256 * The device driver-model tracks all of the drivers known to the system.
257 * The main reason for this tracking is to enable the driver core to match
258 * up drivers with new devices. Once drivers are known objects within the
259 * system, however, a number of other things become possible. Device drivers
260 * can export information and configuration variables that are independent
261 * of any specific device.
263 struct device_driver
{
265 struct bus_type
*bus
;
267 struct module
*owner
;
268 const char *mod_name
; /* used for built-in modules */
270 bool suppress_bind_attrs
; /* disables bind/unbind via sysfs */
271 enum probe_type probe_type
;
273 const struct of_device_id
*of_match_table
;
274 const struct acpi_device_id
*acpi_match_table
;
276 int (*probe
) (struct device
*dev
);
277 int (*remove
) (struct device
*dev
);
278 void (*shutdown
) (struct device
*dev
);
279 int (*suspend
) (struct device
*dev
, pm_message_t state
);
280 int (*resume
) (struct device
*dev
);
281 const struct attribute_group
**groups
;
283 const struct dev_pm_ops
*pm
;
285 struct driver_private
*p
;
289 extern int __must_check
driver_register(struct device_driver
*drv
);
290 extern void driver_unregister(struct device_driver
*drv
);
292 extern struct device_driver
*driver_find(const char *name
,
293 struct bus_type
*bus
);
294 extern int driver_probe_done(void);
295 extern void wait_for_device_probe(void);
298 /* sysfs interface for exporting driver attributes */
300 struct driver_attribute
{
301 struct attribute attr
;
302 ssize_t (*show
)(struct device_driver
*driver
, char *buf
);
303 ssize_t (*store
)(struct device_driver
*driver
, const char *buf
,
307 #define DRIVER_ATTR(_name, _mode, _show, _store) \
308 struct driver_attribute driver_attr_##_name = __ATTR(_name, _mode, _show, _store)
309 #define DRIVER_ATTR_RW(_name) \
310 struct driver_attribute driver_attr_##_name = __ATTR_RW(_name)
311 #define DRIVER_ATTR_RO(_name) \
312 struct driver_attribute driver_attr_##_name = __ATTR_RO(_name)
313 #define DRIVER_ATTR_WO(_name) \
314 struct driver_attribute driver_attr_##_name = __ATTR_WO(_name)
316 extern int __must_check
driver_create_file(struct device_driver
*driver
,
317 const struct driver_attribute
*attr
);
318 extern void driver_remove_file(struct device_driver
*driver
,
319 const struct driver_attribute
*attr
);
321 extern int __must_check
driver_for_each_device(struct device_driver
*drv
,
322 struct device
*start
,
324 int (*fn
)(struct device
*dev
,
326 struct device
*driver_find_device(struct device_driver
*drv
,
327 struct device
*start
, void *data
,
328 int (*match
)(struct device
*dev
, void *data
));
331 * struct subsys_interface - interfaces to device functions
332 * @name: name of the device function
333 * @subsys: subsytem of the devices to attach to
334 * @node: the list of functions registered at the subsystem
335 * @add_dev: device hookup to device function handler
336 * @remove_dev: device hookup to device function handler
338 * Simple interfaces attached to a subsystem. Multiple interfaces can
339 * attach to a subsystem and its devices. Unlike drivers, they do not
340 * exclusively claim or control devices. Interfaces usually represent
341 * a specific functionality of a subsystem/class of devices.
343 struct subsys_interface
{
345 struct bus_type
*subsys
;
346 struct list_head node
;
347 int (*add_dev
)(struct device
*dev
, struct subsys_interface
*sif
);
348 void (*remove_dev
)(struct device
*dev
, struct subsys_interface
*sif
);
351 int subsys_interface_register(struct subsys_interface
*sif
);
352 void subsys_interface_unregister(struct subsys_interface
*sif
);
354 int subsys_system_register(struct bus_type
*subsys
,
355 const struct attribute_group
**groups
);
356 int subsys_virtual_register(struct bus_type
*subsys
,
357 const struct attribute_group
**groups
);
360 * struct class - device classes
361 * @name: Name of the class.
362 * @owner: The module owner.
363 * @class_attrs: Default attributes of this class.
364 * @dev_groups: Default attributes of the devices that belong to the class.
365 * @dev_kobj: The kobject that represents this class and links it into the hierarchy.
366 * @dev_uevent: Called when a device is added, removed from this class, or a
367 * few other things that generate uevents to add the environment
369 * @devnode: Callback to provide the devtmpfs.
370 * @class_release: Called to release this class.
371 * @dev_release: Called to release the device.
372 * @suspend: Used to put the device to sleep mode, usually to a low power
374 * @resume: Used to bring the device from the sleep mode.
375 * @ns_type: Callbacks so sysfs can detemine namespaces.
376 * @namespace: Namespace of the device belongs to this class.
377 * @pm: The default device power management operations of this class.
378 * @p: The private data of the driver core, no one other than the
379 * driver core can touch this.
381 * A class is a higher-level view of a device that abstracts out low-level
382 * implementation details. Drivers may see a SCSI disk or an ATA disk, but,
383 * at the class level, they are all simply disks. Classes allow user space
384 * to work with devices based on what they do, rather than how they are
385 * connected or how they work.
389 struct module
*owner
;
391 struct class_attribute
*class_attrs
;
392 const struct attribute_group
**dev_groups
;
393 struct kobject
*dev_kobj
;
395 int (*dev_uevent
)(struct device
*dev
, struct kobj_uevent_env
*env
);
396 char *(*devnode
)(struct device
*dev
, umode_t
*mode
);
398 void (*class_release
)(struct class *class);
399 void (*dev_release
)(struct device
*dev
);
401 int (*suspend
)(struct device
*dev
, pm_message_t state
);
402 int (*resume
)(struct device
*dev
);
404 const struct kobj_ns_type_operations
*ns_type
;
405 const void *(*namespace)(struct device
*dev
);
407 const struct dev_pm_ops
*pm
;
409 struct subsys_private
*p
;
412 struct class_dev_iter
{
413 struct klist_iter ki
;
414 const struct device_type
*type
;
417 extern struct kobject
*sysfs_dev_block_kobj
;
418 extern struct kobject
*sysfs_dev_char_kobj
;
419 extern int __must_check
__class_register(struct class *class,
420 struct lock_class_key
*key
);
421 extern void class_unregister(struct class *class);
423 /* This is a #define to keep the compiler from merging different
424 * instances of the __key variable */
425 #define class_register(class) \
427 static struct lock_class_key __key; \
428 __class_register(class, &__key); \
432 struct class_compat
*class_compat_register(const char *name
);
433 void class_compat_unregister(struct class_compat
*cls
);
434 int class_compat_create_link(struct class_compat
*cls
, struct device
*dev
,
435 struct device
*device_link
);
436 void class_compat_remove_link(struct class_compat
*cls
, struct device
*dev
,
437 struct device
*device_link
);
439 extern void class_dev_iter_init(struct class_dev_iter
*iter
,
441 struct device
*start
,
442 const struct device_type
*type
);
443 extern struct device
*class_dev_iter_next(struct class_dev_iter
*iter
);
444 extern void class_dev_iter_exit(struct class_dev_iter
*iter
);
446 extern int class_for_each_device(struct class *class, struct device
*start
,
448 int (*fn
)(struct device
*dev
, void *data
));
449 extern struct device
*class_find_device(struct class *class,
450 struct device
*start
, const void *data
,
451 int (*match
)(struct device
*, const void *));
453 struct class_attribute
{
454 struct attribute attr
;
455 ssize_t (*show
)(struct class *class, struct class_attribute
*attr
,
457 ssize_t (*store
)(struct class *class, struct class_attribute
*attr
,
458 const char *buf
, size_t count
);
461 #define CLASS_ATTR(_name, _mode, _show, _store) \
462 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
463 #define CLASS_ATTR_RW(_name) \
464 struct class_attribute class_attr_##_name = __ATTR_RW(_name)
465 #define CLASS_ATTR_RO(_name) \
466 struct class_attribute class_attr_##_name = __ATTR_RO(_name)
468 extern int __must_check
class_create_file_ns(struct class *class,
469 const struct class_attribute
*attr
,
471 extern void class_remove_file_ns(struct class *class,
472 const struct class_attribute
*attr
,
475 static inline int __must_check
class_create_file(struct class *class,
476 const struct class_attribute
*attr
)
478 return class_create_file_ns(class, attr
, NULL
);
481 static inline void class_remove_file(struct class *class,
482 const struct class_attribute
*attr
)
484 return class_remove_file_ns(class, attr
, NULL
);
487 /* Simple class attribute that is just a static string */
488 struct class_attribute_string
{
489 struct class_attribute attr
;
493 /* Currently read-only only */
494 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
495 { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
496 #define CLASS_ATTR_STRING(_name, _mode, _str) \
497 struct class_attribute_string class_attr_##_name = \
498 _CLASS_ATTR_STRING(_name, _mode, _str)
500 extern ssize_t
show_class_attr_string(struct class *class, struct class_attribute
*attr
,
503 struct class_interface
{
504 struct list_head node
;
507 int (*add_dev
) (struct device
*, struct class_interface
*);
508 void (*remove_dev
) (struct device
*, struct class_interface
*);
511 extern int __must_check
class_interface_register(struct class_interface
*);
512 extern void class_interface_unregister(struct class_interface
*);
514 extern struct class * __must_check
__class_create(struct module
*owner
,
516 struct lock_class_key
*key
);
517 extern void class_destroy(struct class *cls
);
519 /* This is a #define to keep the compiler from merging different
520 * instances of the __key variable */
521 #define class_create(owner, name) \
523 static struct lock_class_key __key; \
524 __class_create(owner, name, &__key); \
528 * The type of device, "struct device" is embedded in. A class
529 * or bus can contain devices of different types
530 * like "partitions" and "disks", "mouse" and "event".
531 * This identifies the device type and carries type-specific
532 * information, equivalent to the kobj_type of a kobject.
533 * If "name" is specified, the uevent will contain it in
534 * the DEVTYPE variable.
538 const struct attribute_group
**groups
;
539 int (*uevent
)(struct device
*dev
, struct kobj_uevent_env
*env
);
540 char *(*devnode
)(struct device
*dev
, umode_t
*mode
,
541 kuid_t
*uid
, kgid_t
*gid
);
542 void (*release
)(struct device
*dev
);
544 const struct dev_pm_ops
*pm
;
547 /* interface for exporting device attributes */
548 struct device_attribute
{
549 struct attribute attr
;
550 ssize_t (*show
)(struct device
*dev
, struct device_attribute
*attr
,
552 ssize_t (*store
)(struct device
*dev
, struct device_attribute
*attr
,
553 const char *buf
, size_t count
);
556 struct dev_ext_attribute
{
557 struct device_attribute attr
;
561 ssize_t
device_show_ulong(struct device
*dev
, struct device_attribute
*attr
,
563 ssize_t
device_store_ulong(struct device
*dev
, struct device_attribute
*attr
,
564 const char *buf
, size_t count
);
565 ssize_t
device_show_int(struct device
*dev
, struct device_attribute
*attr
,
567 ssize_t
device_store_int(struct device
*dev
, struct device_attribute
*attr
,
568 const char *buf
, size_t count
);
569 ssize_t
device_show_bool(struct device
*dev
, struct device_attribute
*attr
,
571 ssize_t
device_store_bool(struct device
*dev
, struct device_attribute
*attr
,
572 const char *buf
, size_t count
);
574 #define DEVICE_ATTR(_name, _mode, _show, _store) \
575 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
576 #define DEVICE_ATTR_RW(_name) \
577 struct device_attribute dev_attr_##_name = __ATTR_RW(_name)
578 #define DEVICE_ATTR_RO(_name) \
579 struct device_attribute dev_attr_##_name = __ATTR_RO(_name)
580 #define DEVICE_ATTR_WO(_name) \
581 struct device_attribute dev_attr_##_name = __ATTR_WO(_name)
582 #define DEVICE_ULONG_ATTR(_name, _mode, _var) \
583 struct dev_ext_attribute dev_attr_##_name = \
584 { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
585 #define DEVICE_INT_ATTR(_name, _mode, _var) \
586 struct dev_ext_attribute dev_attr_##_name = \
587 { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
588 #define DEVICE_BOOL_ATTR(_name, _mode, _var) \
589 struct dev_ext_attribute dev_attr_##_name = \
590 { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
591 #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
592 struct device_attribute dev_attr_##_name = \
593 __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
595 extern int device_create_file(struct device
*device
,
596 const struct device_attribute
*entry
);
597 extern void device_remove_file(struct device
*dev
,
598 const struct device_attribute
*attr
);
599 extern bool device_remove_file_self(struct device
*dev
,
600 const struct device_attribute
*attr
);
601 extern int __must_check
device_create_bin_file(struct device
*dev
,
602 const struct bin_attribute
*attr
);
603 extern void device_remove_bin_file(struct device
*dev
,
604 const struct bin_attribute
*attr
);
606 /* device resource management */
607 typedef void (*dr_release_t
)(struct device
*dev
, void *res
);
608 typedef int (*dr_match_t
)(struct device
*dev
, void *res
, void *match_data
);
610 #ifdef CONFIG_DEBUG_DEVRES
611 extern void *__devres_alloc_node(dr_release_t release
, size_t size
, gfp_t gfp
,
612 int nid
, const char *name
);
613 #define devres_alloc(release, size, gfp) \
614 __devres_alloc_node(release, size, gfp, NUMA_NO_NODE, #release)
615 #define devres_alloc_node(release, size, gfp, nid) \
616 __devres_alloc_node(release, size, gfp, nid, #release)
618 extern void *devres_alloc_node(dr_release_t release
, size_t size
, gfp_t gfp
,
620 static inline void *devres_alloc(dr_release_t release
, size_t size
, gfp_t gfp
)
622 return devres_alloc_node(release
, size
, gfp
, NUMA_NO_NODE
);
626 extern void devres_for_each_res(struct device
*dev
, dr_release_t release
,
627 dr_match_t match
, void *match_data
,
628 void (*fn
)(struct device
*, void *, void *),
630 extern void devres_free(void *res
);
631 extern void devres_add(struct device
*dev
, void *res
);
632 extern void *devres_find(struct device
*dev
, dr_release_t release
,
633 dr_match_t match
, void *match_data
);
634 extern void *devres_get(struct device
*dev
, void *new_res
,
635 dr_match_t match
, void *match_data
);
636 extern void *devres_remove(struct device
*dev
, dr_release_t release
,
637 dr_match_t match
, void *match_data
);
638 extern int devres_destroy(struct device
*dev
, dr_release_t release
,
639 dr_match_t match
, void *match_data
);
640 extern int devres_release(struct device
*dev
, dr_release_t release
,
641 dr_match_t match
, void *match_data
);
644 extern void * __must_check
devres_open_group(struct device
*dev
, void *id
,
646 extern void devres_close_group(struct device
*dev
, void *id
);
647 extern void devres_remove_group(struct device
*dev
, void *id
);
648 extern int devres_release_group(struct device
*dev
, void *id
);
650 /* managed devm_k.alloc/kfree for device drivers */
651 extern void *devm_kmalloc(struct device
*dev
, size_t size
, gfp_t gfp
);
652 extern __printf(3, 0)
653 char *devm_kvasprintf(struct device
*dev
, gfp_t gfp
, const char *fmt
,
655 extern __printf(3, 4)
656 char *devm_kasprintf(struct device
*dev
, gfp_t gfp
, const char *fmt
, ...);
657 static inline void *devm_kzalloc(struct device
*dev
, size_t size
, gfp_t gfp
)
659 return devm_kmalloc(dev
, size
, gfp
| __GFP_ZERO
);
661 static inline void *devm_kmalloc_array(struct device
*dev
,
662 size_t n
, size_t size
, gfp_t flags
)
664 if (size
!= 0 && n
> SIZE_MAX
/ size
)
666 return devm_kmalloc(dev
, n
* size
, flags
);
668 static inline void *devm_kcalloc(struct device
*dev
,
669 size_t n
, size_t size
, gfp_t flags
)
671 return devm_kmalloc_array(dev
, n
, size
, flags
| __GFP_ZERO
);
673 extern void devm_kfree(struct device
*dev
, void *p
);
674 extern char *devm_kstrdup(struct device
*dev
, const char *s
, gfp_t gfp
);
675 extern void *devm_kmemdup(struct device
*dev
, const void *src
, size_t len
,
678 extern unsigned long devm_get_free_pages(struct device
*dev
,
679 gfp_t gfp_mask
, unsigned int order
);
680 extern void devm_free_pages(struct device
*dev
, unsigned long addr
);
682 void __iomem
*devm_ioremap_resource(struct device
*dev
, struct resource
*res
);
684 /* allows to add/remove a custom action to devres stack */
685 int devm_add_action(struct device
*dev
, void (*action
)(void *), void *data
);
686 void devm_remove_action(struct device
*dev
, void (*action
)(void *), void *data
);
688 struct device_dma_parameters
{
690 * a low level driver may set these to teach IOMMU code about
693 unsigned int max_segment_size
;
694 unsigned long segment_boundary_mask
;
698 * struct device - The basic device structure
699 * @parent: The device's "parent" device, the device to which it is attached.
700 * In most cases, a parent device is some sort of bus or host
701 * controller. If parent is NULL, the device, is a top-level device,
702 * which is not usually what you want.
703 * @p: Holds the private data of the driver core portions of the device.
704 * See the comment of the struct device_private for detail.
705 * @kobj: A top-level, abstract class from which other classes are derived.
706 * @init_name: Initial name of the device.
707 * @type: The type of device.
708 * This identifies the device type and carries type-specific
710 * @mutex: Mutex to synchronize calls to its driver.
711 * @bus: Type of bus device is on.
712 * @driver: Which driver has allocated this
713 * @platform_data: Platform data specific to the device.
714 * Example: For devices on custom boards, as typical of embedded
715 * and SOC based hardware, Linux often uses platform_data to point
716 * to board-specific structures describing devices and how they
717 * are wired. That can include what ports are available, chip
718 * variants, which GPIO pins act in what additional roles, and so
719 * on. This shrinks the "Board Support Packages" (BSPs) and
720 * minimizes board-specific #ifdefs in drivers.
721 * @driver_data: Private pointer for driver specific info.
722 * @power: For device power management.
723 * See Documentation/power/devices.txt for details.
724 * @pm_domain: Provide callbacks that are executed during system suspend,
725 * hibernation, system resume and during runtime PM transitions
726 * along with subsystem-level and driver-level callbacks.
727 * @pins: For device pin management.
728 * See Documentation/pinctrl.txt for details.
729 * @msi_list: Hosts MSI descriptors
730 * @msi_domain: The generic MSI domain this device is using.
731 * @numa_node: NUMA node this device is close to.
732 * @dma_mask: Dma mask (if dma'ble device).
733 * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
734 * hardware supports 64-bit addresses for consistent allocations
736 * @dma_pfn_offset: offset of DMA memory range relatively of RAM
737 * @dma_parms: A low level driver may set these to teach IOMMU code about
738 * segment limitations.
739 * @dma_pools: Dma pools (if dma'ble device).
740 * @dma_mem: Internal for coherent mem override.
741 * @cma_area: Contiguous memory area for dma allocations
742 * @archdata: For arch-specific additions.
743 * @of_node: Associated device tree node.
744 * @fwnode: Associated device node supplied by platform firmware.
745 * @devt: For creating the sysfs "dev".
746 * @id: device instance
747 * @devres_lock: Spinlock to protect the resource of the device.
748 * @devres_head: The resources list of the device.
749 * @knode_class: The node used to add the device to the class list.
750 * @class: The class of the device.
751 * @groups: Optional attribute groups.
752 * @release: Callback to free the device after all references have
753 * gone away. This should be set by the allocator of the
754 * device (i.e. the bus driver that discovered the device).
755 * @iommu_group: IOMMU group the device belongs to.
757 * @offline_disabled: If set, the device is permanently online.
758 * @offline: Set after successful invocation of bus type's .offline().
760 * At the lowest level, every device in a Linux system is represented by an
761 * instance of struct device. The device structure contains the information
762 * that the device model core needs to model the system. Most subsystems,
763 * however, track additional information about the devices they host. As a
764 * result, it is rare for devices to be represented by bare device structures;
765 * instead, that structure, like kobject structures, is usually embedded within
766 * a higher-level representation of the device.
769 struct device
*parent
;
771 struct device_private
*p
;
774 const char *init_name
; /* initial name of the device */
775 const struct device_type
*type
;
777 struct mutex mutex
; /* mutex to synchronize calls to
781 struct bus_type
*bus
; /* type of bus device is on */
782 struct device_driver
*driver
; /* which driver has allocated this
784 void *platform_data
; /* Platform specific data, device
785 core doesn't touch it */
786 void *driver_data
; /* Driver data, set and get with
787 dev_set/get_drvdata */
788 struct dev_pm_info power
;
789 struct dev_pm_domain
*pm_domain
;
791 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
792 struct irq_domain
*msi_domain
;
794 #ifdef CONFIG_PINCTRL
795 struct dev_pin_info
*pins
;
797 #ifdef CONFIG_GENERIC_MSI_IRQ
798 struct list_head msi_list
;
802 int numa_node
; /* NUMA node this device is close to */
804 u64
*dma_mask
; /* dma mask (if dma'able device) */
805 u64 coherent_dma_mask
;/* Like dma_mask, but for
806 alloc_coherent mappings as
807 not all hardware supports
808 64 bit addresses for consistent
809 allocations such descriptors. */
810 unsigned long dma_pfn_offset
;
812 struct device_dma_parameters
*dma_parms
;
814 struct list_head dma_pools
; /* dma pools (if dma'ble) */
816 struct dma_coherent_mem
*dma_mem
; /* internal for coherent mem
818 #ifdef CONFIG_DMA_CMA
819 struct cma
*cma_area
; /* contiguous memory area for dma
822 /* arch specific additions */
823 struct dev_archdata archdata
;
825 struct device_node
*of_node
; /* associated device tree node */
826 struct fwnode_handle
*fwnode
; /* firmware device node */
828 dev_t devt
; /* dev_t, creates the sysfs "dev" */
829 u32 id
; /* device instance */
831 spinlock_t devres_lock
;
832 struct list_head devres_head
;
834 struct klist_node knode_class
;
836 const struct attribute_group
**groups
; /* optional groups */
838 void (*release
)(struct device
*dev
);
839 struct iommu_group
*iommu_group
;
841 bool offline_disabled
:1;
845 static inline struct device
*kobj_to_dev(struct kobject
*kobj
)
847 return container_of(kobj
, struct device
, kobj
);
850 /* Get the wakeup routines, which depend on struct device */
851 #include <linux/pm_wakeup.h>
853 static inline const char *dev_name(const struct device
*dev
)
855 /* Use the init name until the kobject becomes available */
857 return dev
->init_name
;
859 return kobject_name(&dev
->kobj
);
862 extern __printf(2, 3)
863 int dev_set_name(struct device
*dev
, const char *name
, ...);
866 static inline int dev_to_node(struct device
*dev
)
868 return dev
->numa_node
;
870 static inline void set_dev_node(struct device
*dev
, int node
)
872 dev
->numa_node
= node
;
875 static inline int dev_to_node(struct device
*dev
)
879 static inline void set_dev_node(struct device
*dev
, int node
)
884 static inline struct irq_domain
*dev_get_msi_domain(const struct device
*dev
)
886 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
887 return dev
->msi_domain
;
893 static inline void dev_set_msi_domain(struct device
*dev
, struct irq_domain
*d
)
895 #ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
900 static inline void *dev_get_drvdata(const struct device
*dev
)
902 return dev
->driver_data
;
905 static inline void dev_set_drvdata(struct device
*dev
, void *data
)
907 dev
->driver_data
= data
;
910 static inline struct pm_subsys_data
*dev_to_psd(struct device
*dev
)
912 return dev
? dev
->power
.subsys_data
: NULL
;
915 static inline unsigned int dev_get_uevent_suppress(const struct device
*dev
)
917 return dev
->kobj
.uevent_suppress
;
920 static inline void dev_set_uevent_suppress(struct device
*dev
, int val
)
922 dev
->kobj
.uevent_suppress
= val
;
925 static inline int device_is_registered(struct device
*dev
)
927 return dev
->kobj
.state_in_sysfs
;
930 static inline void device_enable_async_suspend(struct device
*dev
)
932 if (!dev
->power
.is_prepared
)
933 dev
->power
.async_suspend
= true;
936 static inline void device_disable_async_suspend(struct device
*dev
)
938 if (!dev
->power
.is_prepared
)
939 dev
->power
.async_suspend
= false;
942 static inline bool device_async_suspend_enabled(struct device
*dev
)
944 return !!dev
->power
.async_suspend
;
947 static inline void pm_suspend_ignore_children(struct device
*dev
, bool enable
)
949 dev
->power
.ignore_children
= enable
;
952 static inline void dev_pm_syscore_device(struct device
*dev
, bool val
)
954 #ifdef CONFIG_PM_SLEEP
955 dev
->power
.syscore
= val
;
959 static inline void device_lock(struct device
*dev
)
961 mutex_lock(&dev
->mutex
);
964 static inline int device_lock_interruptible(struct device
*dev
)
966 return mutex_lock_interruptible(&dev
->mutex
);
969 static inline int device_trylock(struct device
*dev
)
971 return mutex_trylock(&dev
->mutex
);
974 static inline void device_unlock(struct device
*dev
)
976 mutex_unlock(&dev
->mutex
);
979 static inline void device_lock_assert(struct device
*dev
)
981 lockdep_assert_held(&dev
->mutex
);
984 static inline struct device_node
*dev_of_node(struct device
*dev
)
986 if (!IS_ENABLED(CONFIG_OF
))
991 void driver_init(void);
994 * High level routines for use by the bus drivers
996 extern int __must_check
device_register(struct device
*dev
);
997 extern void device_unregister(struct device
*dev
);
998 extern void device_initialize(struct device
*dev
);
999 extern int __must_check
device_add(struct device
*dev
);
1000 extern void device_del(struct device
*dev
);
1001 extern int device_for_each_child(struct device
*dev
, void *data
,
1002 int (*fn
)(struct device
*dev
, void *data
));
1003 extern int device_for_each_child_reverse(struct device
*dev
, void *data
,
1004 int (*fn
)(struct device
*dev
, void *data
));
1005 extern struct device
*device_find_child(struct device
*dev
, void *data
,
1006 int (*match
)(struct device
*dev
, void *data
));
1007 extern int device_rename(struct device
*dev
, const char *new_name
);
1008 extern int device_move(struct device
*dev
, struct device
*new_parent
,
1009 enum dpm_order dpm_order
);
1010 extern const char *device_get_devnode(struct device
*dev
,
1011 umode_t
*mode
, kuid_t
*uid
, kgid_t
*gid
,
1014 static inline bool device_supports_offline(struct device
*dev
)
1016 return dev
->bus
&& dev
->bus
->offline
&& dev
->bus
->online
;
1019 extern void lock_device_hotplug(void);
1020 extern void unlock_device_hotplug(void);
1021 extern int lock_device_hotplug_sysfs(void);
1022 extern int device_offline(struct device
*dev
);
1023 extern int device_online(struct device
*dev
);
1024 extern void set_primary_fwnode(struct device
*dev
, struct fwnode_handle
*fwnode
);
1025 extern void set_secondary_fwnode(struct device
*dev
, struct fwnode_handle
*fwnode
);
1028 * Root device objects for grouping under /sys/devices
1030 extern struct device
*__root_device_register(const char *name
,
1031 struct module
*owner
);
1033 /* This is a macro to avoid include problems with THIS_MODULE */
1034 #define root_device_register(name) \
1035 __root_device_register(name, THIS_MODULE)
1037 extern void root_device_unregister(struct device
*root
);
1039 static inline void *dev_get_platdata(const struct device
*dev
)
1041 return dev
->platform_data
;
1045 * Manual binding of a device to driver. See drivers/base/bus.c
1046 * for information on use.
1048 extern int __must_check
device_bind_driver(struct device
*dev
);
1049 extern void device_release_driver(struct device
*dev
);
1050 extern int __must_check
device_attach(struct device
*dev
);
1051 extern int __must_check
driver_attach(struct device_driver
*drv
);
1052 extern void device_initial_probe(struct device
*dev
);
1053 extern int __must_check
device_reprobe(struct device
*dev
);
1055 extern bool device_is_bound(struct device
*dev
);
1058 * Easy functions for dynamically creating devices on the fly
1060 extern __printf(5, 0)
1061 struct device
*device_create_vargs(struct class *cls
, struct device
*parent
,
1062 dev_t devt
, void *drvdata
,
1063 const char *fmt
, va_list vargs
);
1064 extern __printf(5, 6)
1065 struct device
*device_create(struct class *cls
, struct device
*parent
,
1066 dev_t devt
, void *drvdata
,
1067 const char *fmt
, ...);
1068 extern __printf(6, 7)
1069 struct device
*device_create_with_groups(struct class *cls
,
1070 struct device
*parent
, dev_t devt
, void *drvdata
,
1071 const struct attribute_group
**groups
,
1072 const char *fmt
, ...);
1073 extern void device_destroy(struct class *cls
, dev_t devt
);
1076 * Platform "fixup" functions - allow the platform to have their say
1077 * about devices and actions that the general device layer doesn't
1080 /* Notify platform of device discovery */
1081 extern int (*platform_notify
)(struct device
*dev
);
1083 extern int (*platform_notify_remove
)(struct device
*dev
);
1087 * get_device - atomically increment the reference count for the device.
1090 extern struct device
*get_device(struct device
*dev
);
1091 extern void put_device(struct device
*dev
);
1093 #ifdef CONFIG_DEVTMPFS
1094 extern int devtmpfs_create_node(struct device
*dev
);
1095 extern int devtmpfs_delete_node(struct device
*dev
);
1096 extern int devtmpfs_mount(const char *mntdir
);
1098 static inline int devtmpfs_create_node(struct device
*dev
) { return 0; }
1099 static inline int devtmpfs_delete_node(struct device
*dev
) { return 0; }
1100 static inline int devtmpfs_mount(const char *mountpoint
) { return 0; }
1103 /* drivers/base/power/shutdown.c */
1104 extern void device_shutdown(void);
1106 /* debugging and troubleshooting/diagnostic helpers. */
1107 extern const char *dev_driver_string(const struct device
*dev
);
1110 #ifdef CONFIG_PRINTK
1112 extern __printf(3, 0)
1113 int dev_vprintk_emit(int level
, const struct device
*dev
,
1114 const char *fmt
, va_list args
);
1115 extern __printf(3, 4)
1116 int dev_printk_emit(int level
, const struct device
*dev
, const char *fmt
, ...);
1118 extern __printf(3, 4)
1119 void dev_printk(const char *level
, const struct device
*dev
,
1120 const char *fmt
, ...);
1121 extern __printf(2, 3)
1122 void dev_emerg(const struct device
*dev
, const char *fmt
, ...);
1123 extern __printf(2, 3)
1124 void dev_alert(const struct device
*dev
, const char *fmt
, ...);
1125 extern __printf(2, 3)
1126 void dev_crit(const struct device
*dev
, const char *fmt
, ...);
1127 extern __printf(2, 3)
1128 void dev_err(const struct device
*dev
, const char *fmt
, ...);
1129 extern __printf(2, 3)
1130 void dev_warn(const struct device
*dev
, const char *fmt
, ...);
1131 extern __printf(2, 3)
1132 void dev_notice(const struct device
*dev
, const char *fmt
, ...);
1133 extern __printf(2, 3)
1134 void _dev_info(const struct device
*dev
, const char *fmt
, ...);
1138 static inline __printf(3, 0)
1139 int dev_vprintk_emit(int level
, const struct device
*dev
,
1140 const char *fmt
, va_list args
)
1142 static inline __printf(3, 4)
1143 int dev_printk_emit(int level
, const struct device
*dev
, const char *fmt
, ...)
1146 static inline void __dev_printk(const char *level
, const struct device
*dev
,
1147 struct va_format
*vaf
)
1149 static inline __printf(3, 4)
1150 void dev_printk(const char *level
, const struct device
*dev
,
1151 const char *fmt
, ...)
1154 static inline __printf(2, 3)
1155 void dev_emerg(const struct device
*dev
, const char *fmt
, ...)
1157 static inline __printf(2, 3)
1158 void dev_crit(const struct device
*dev
, const char *fmt
, ...)
1160 static inline __printf(2, 3)
1161 void dev_alert(const struct device
*dev
, const char *fmt
, ...)
1163 static inline __printf(2, 3)
1164 void dev_err(const struct device
*dev
, const char *fmt
, ...)
1166 static inline __printf(2, 3)
1167 void dev_warn(const struct device
*dev
, const char *fmt
, ...)
1169 static inline __printf(2, 3)
1170 void dev_notice(const struct device
*dev
, const char *fmt
, ...)
1172 static inline __printf(2, 3)
1173 void _dev_info(const struct device
*dev
, const char *fmt
, ...)
1179 * Stupid hackaround for existing uses of non-printk uses dev_info
1181 * Note that the definition of dev_info below is actually _dev_info
1182 * and a macro is used to avoid redefining dev_info
1185 #define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)
1187 #if defined(CONFIG_DYNAMIC_DEBUG)
1188 #define dev_dbg(dev, format, ...) \
1190 dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
1192 #elif defined(DEBUG)
1193 #define dev_dbg(dev, format, arg...) \
1194 dev_printk(KERN_DEBUG, dev, format, ##arg)
1196 #define dev_dbg(dev, format, arg...) \
1199 dev_printk(KERN_DEBUG, dev, format, ##arg); \
1203 #ifdef CONFIG_PRINTK
1204 #define dev_level_once(dev_level, dev, fmt, ...) \
1206 static bool __print_once __read_mostly; \
1208 if (!__print_once) { \
1209 __print_once = true; \
1210 dev_level(dev, fmt, ##__VA_ARGS__); \
1214 #define dev_level_once(dev_level, dev, fmt, ...) \
1217 dev_level(dev, fmt, ##__VA_ARGS__); \
1221 #define dev_emerg_once(dev, fmt, ...) \
1222 dev_level_once(dev_emerg, dev, fmt, ##__VA_ARGS__)
1223 #define dev_alert_once(dev, fmt, ...) \
1224 dev_level_once(dev_alert, dev, fmt, ##__VA_ARGS__)
1225 #define dev_crit_once(dev, fmt, ...) \
1226 dev_level_once(dev_crit, dev, fmt, ##__VA_ARGS__)
1227 #define dev_err_once(dev, fmt, ...) \
1228 dev_level_once(dev_err, dev, fmt, ##__VA_ARGS__)
1229 #define dev_warn_once(dev, fmt, ...) \
1230 dev_level_once(dev_warn, dev, fmt, ##__VA_ARGS__)
1231 #define dev_notice_once(dev, fmt, ...) \
1232 dev_level_once(dev_notice, dev, fmt, ##__VA_ARGS__)
1233 #define dev_info_once(dev, fmt, ...) \
1234 dev_level_once(dev_info, dev, fmt, ##__VA_ARGS__)
1235 #define dev_dbg_once(dev, fmt, ...) \
1236 dev_level_once(dev_dbg, dev, fmt, ##__VA_ARGS__)
1238 #define dev_level_ratelimited(dev_level, dev, fmt, ...) \
1240 static DEFINE_RATELIMIT_STATE(_rs, \
1241 DEFAULT_RATELIMIT_INTERVAL, \
1242 DEFAULT_RATELIMIT_BURST); \
1243 if (__ratelimit(&_rs)) \
1244 dev_level(dev, fmt, ##__VA_ARGS__); \
1247 #define dev_emerg_ratelimited(dev, fmt, ...) \
1248 dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__)
1249 #define dev_alert_ratelimited(dev, fmt, ...) \
1250 dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__)
1251 #define dev_crit_ratelimited(dev, fmt, ...) \
1252 dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__)
1253 #define dev_err_ratelimited(dev, fmt, ...) \
1254 dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__)
1255 #define dev_warn_ratelimited(dev, fmt, ...) \
1256 dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__)
1257 #define dev_notice_ratelimited(dev, fmt, ...) \
1258 dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
1259 #define dev_info_ratelimited(dev, fmt, ...) \
1260 dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
1261 #if defined(CONFIG_DYNAMIC_DEBUG)
1262 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
1263 #define dev_dbg_ratelimited(dev, fmt, ...) \
1265 static DEFINE_RATELIMIT_STATE(_rs, \
1266 DEFAULT_RATELIMIT_INTERVAL, \
1267 DEFAULT_RATELIMIT_BURST); \
1268 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
1269 if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) && \
1270 __ratelimit(&_rs)) \
1271 __dynamic_dev_dbg(&descriptor, dev, fmt, \
1274 #elif defined(DEBUG)
1275 #define dev_dbg_ratelimited(dev, fmt, ...) \
1277 static DEFINE_RATELIMIT_STATE(_rs, \
1278 DEFAULT_RATELIMIT_INTERVAL, \
1279 DEFAULT_RATELIMIT_BURST); \
1280 if (__ratelimit(&_rs)) \
1281 dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); \
1284 #define dev_dbg_ratelimited(dev, fmt, ...) \
1285 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
1288 #ifdef VERBOSE_DEBUG
1289 #define dev_vdbg dev_dbg
1291 #define dev_vdbg(dev, format, arg...) \
1294 dev_printk(KERN_DEBUG, dev, format, ##arg); \
1299 * dev_WARN*() acts like dev_printk(), but with the key difference of
1300 * using WARN/WARN_ONCE to include file/line information and a backtrace.
1302 #define dev_WARN(dev, format, arg...) \
1303 WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg);
1305 #define dev_WARN_ONCE(dev, condition, format, arg...) \
1306 WARN_ONCE(condition, "%s %s: " format, \
1307 dev_driver_string(dev), dev_name(dev), ## arg)
1309 /* Create alias, so I can be autoloaded. */
1310 #define MODULE_ALIAS_CHARDEV(major,minor) \
1311 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
1312 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
1313 MODULE_ALIAS("char-major-" __stringify(major) "-*")
1315 #ifdef CONFIG_SYSFS_DEPRECATED
1316 extern long sysfs_deprecated
;
1318 #define sysfs_deprecated 0
1322 * module_driver() - Helper macro for drivers that don't do anything
1323 * special in module init/exit. This eliminates a lot of boilerplate.
1324 * Each module may only use this macro once, and calling it replaces
1325 * module_init() and module_exit().
1327 * @__driver: driver name
1328 * @__register: register function for this driver type
1329 * @__unregister: unregister function for this driver type
1330 * @...: Additional arguments to be passed to __register and __unregister.
1332 * Use this macro to construct bus specific macros for registering
1333 * drivers, and do not use it on its own.
1335 #define module_driver(__driver, __register, __unregister, ...) \
1336 static int __init __driver##_init(void) \
1338 return __register(&(__driver) , ##__VA_ARGS__); \
1340 module_init(__driver##_init); \
1341 static void __exit __driver##_exit(void) \
1343 __unregister(&(__driver) , ##__VA_ARGS__); \
1345 module_exit(__driver##_exit);
1348 * builtin_driver() - Helper macro for drivers that don't do anything
1349 * special in init and have no exit. This eliminates some boilerplate.
1350 * Each driver may only use this macro once, and calling it replaces
1351 * device_initcall (or in some cases, the legacy __initcall). This is
1352 * meant to be a direct parallel of module_driver() above but without
1353 * the __exit stuff that is not used for builtin cases.
1355 * @__driver: driver name
1356 * @__register: register function for this driver type
1357 * @...: Additional arguments to be passed to __register
1359 * Use this macro to construct bus specific macros for registering
1360 * drivers, and do not use it on its own.
1362 #define builtin_driver(__driver, __register, ...) \
1363 static int __init __driver##_init(void) \
1365 return __register(&(__driver) , ##__VA_ARGS__); \
1367 device_initcall(__driver##_init);
1369 #endif /* _DEVICE_H_ */