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>
25 #include <linux/atomic.h>
26 #include <linux/ratelimit.h>
27 #include <asm/device.h>
30 struct device_private
;
32 struct driver_private
;
35 struct subsys_private
;
41 struct bus_attribute
{
42 struct attribute attr
;
43 ssize_t (*show
)(struct bus_type
*bus
, char *buf
);
44 ssize_t (*store
)(struct bus_type
*bus
, const char *buf
, size_t count
);
47 #define BUS_ATTR(_name, _mode, _show, _store) \
48 struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
50 extern int __must_check
bus_create_file(struct bus_type
*,
51 struct bus_attribute
*);
52 extern void bus_remove_file(struct bus_type
*, struct bus_attribute
*);
55 * struct bus_type - The bus type of the device
57 * @name: The name of the bus.
58 * @dev_name: Used for subsystems to enumerate devices like ("foo%u", dev->id).
59 * @dev_root: Default device to use as the parent.
60 * @bus_attrs: Default attributes of the bus.
61 * @dev_attrs: Default attributes of the devices on the bus.
62 * @drv_attrs: Default attributes of the device drivers on the bus.
63 * @match: Called, perhaps multiple times, whenever a new device or driver
64 * is added for this bus. It should return a nonzero value if the
65 * given device can be handled by the given driver.
66 * @uevent: Called when a device is added, removed, or a few other things
67 * that generate uevents to add the environment variables.
68 * @probe: Called when a new device or driver add to this bus, and callback
69 * the specific driver's probe to initial the matched device.
70 * @remove: Called when a device removed from this bus.
71 * @shutdown: Called at shut-down time to quiesce the device.
72 * @suspend: Called when a device on this bus wants to go to sleep mode.
73 * @resume: Called to bring a device on this bus out of sleep mode.
74 * @pm: Power management operations of this bus, callback the specific
75 * device driver's pm-ops.
76 * @iommu_ops: IOMMU specific operations for this bus, used to attach IOMMU
77 * driver implementations to a bus and allow the driver to do
79 * @p: The private data of the driver core, only the driver core can
82 * A bus is a channel between the processor and one or more devices. For the
83 * purposes of the device model, all devices are connected via a bus, even if
84 * it is an internal, virtual, "platform" bus. Buses can plug into each other.
85 * A USB controller is usually a PCI device, for example. The device model
86 * represents the actual connections between buses and the devices they control.
87 * A bus is represented by the bus_type structure. It contains the name, the
88 * default attributes, the bus' methods, PM operations, and the driver core's
94 struct device
*dev_root
;
95 struct bus_attribute
*bus_attrs
;
96 struct device_attribute
*dev_attrs
;
97 struct driver_attribute
*drv_attrs
;
99 int (*match
)(struct device
*dev
, struct device_driver
*drv
);
100 int (*uevent
)(struct device
*dev
, struct kobj_uevent_env
*env
);
101 int (*probe
)(struct device
*dev
);
102 int (*remove
)(struct device
*dev
);
103 void (*shutdown
)(struct device
*dev
);
105 int (*suspend
)(struct device
*dev
, pm_message_t state
);
106 int (*resume
)(struct device
*dev
);
108 const struct dev_pm_ops
*pm
;
110 struct iommu_ops
*iommu_ops
;
112 struct subsys_private
*p
;
115 /* This is a #define to keep the compiler from merging different
116 * instances of the __key variable */
117 #define bus_register(subsys) \
119 static struct lock_class_key __key; \
120 __bus_register(subsys, &__key); \
122 extern int __must_check
__bus_register(struct bus_type
*bus
,
123 struct lock_class_key
*key
);
124 extern void bus_unregister(struct bus_type
*bus
);
126 extern int __must_check
bus_rescan_devices(struct bus_type
*bus
);
128 /* iterator helpers for buses */
129 struct subsys_dev_iter
{
130 struct klist_iter ki
;
131 const struct device_type
*type
;
133 void subsys_dev_iter_init(struct subsys_dev_iter
*iter
,
134 struct bus_type
*subsys
,
135 struct device
*start
,
136 const struct device_type
*type
);
137 struct device
*subsys_dev_iter_next(struct subsys_dev_iter
*iter
);
138 void subsys_dev_iter_exit(struct subsys_dev_iter
*iter
);
140 int bus_for_each_dev(struct bus_type
*bus
, struct device
*start
, void *data
,
141 int (*fn
)(struct device
*dev
, void *data
));
142 struct device
*bus_find_device(struct bus_type
*bus
, struct device
*start
,
144 int (*match
)(struct device
*dev
, void *data
));
145 struct device
*bus_find_device_by_name(struct bus_type
*bus
,
146 struct device
*start
,
148 struct device
*subsys_find_device_by_id(struct bus_type
*bus
, unsigned int id
,
149 struct device
*hint
);
150 int bus_for_each_drv(struct bus_type
*bus
, struct device_driver
*start
,
151 void *data
, int (*fn
)(struct device_driver
*, void *));
152 void bus_sort_breadthfirst(struct bus_type
*bus
,
153 int (*compare
)(const struct device
*a
,
154 const struct device
*b
));
156 * Bus notifiers: Get notified of addition/removal of devices
157 * and binding/unbinding of drivers to devices.
158 * In the long run, it should be a replacement for the platform
161 struct notifier_block
;
163 extern int bus_register_notifier(struct bus_type
*bus
,
164 struct notifier_block
*nb
);
165 extern int bus_unregister_notifier(struct bus_type
*bus
,
166 struct notifier_block
*nb
);
168 /* All 4 notifers below get called with the target struct device *
169 * as an argument. Note that those functions are likely to be called
170 * with the device lock held in the core, so be careful.
172 #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
173 #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device removed */
174 #define BUS_NOTIFY_BIND_DRIVER 0x00000003 /* driver about to be
176 #define BUS_NOTIFY_BOUND_DRIVER 0x00000004 /* driver bound to device */
177 #define BUS_NOTIFY_UNBIND_DRIVER 0x00000005 /* driver about to be
179 #define BUS_NOTIFY_UNBOUND_DRIVER 0x00000006 /* driver is unbound
182 extern struct kset
*bus_get_kset(struct bus_type
*bus
);
183 extern struct klist
*bus_get_device_klist(struct bus_type
*bus
);
186 * struct device_driver - The basic device driver structure
187 * @name: Name of the device driver.
188 * @bus: The bus which the device of this driver belongs to.
189 * @owner: The module owner.
190 * @mod_name: Used for built-in modules.
191 * @suppress_bind_attrs: Disables bind/unbind via sysfs.
192 * @of_match_table: The open firmware table.
193 * @acpi_match_table: The ACPI match table.
194 * @probe: Called to query the existence of a specific device,
195 * whether this driver can work with it, and bind the driver
196 * to a specific device.
197 * @remove: Called when the device is removed from the system to
198 * unbind a device from this driver.
199 * @shutdown: Called at shut-down time to quiesce the device.
200 * @suspend: Called to put the device to sleep mode. Usually to a
202 * @resume: Called to bring a device from sleep mode.
203 * @groups: Default attributes that get created by the driver core
205 * @pm: Power management operations of the device which matched
207 * @p: Driver core's private data, no one other than the driver
208 * core can touch this.
210 * The device driver-model tracks all of the drivers known to the system.
211 * The main reason for this tracking is to enable the driver core to match
212 * up drivers with new devices. Once drivers are known objects within the
213 * system, however, a number of other things become possible. Device drivers
214 * can export information and configuration variables that are independent
215 * of any specific device.
217 struct device_driver
{
219 struct bus_type
*bus
;
221 struct module
*owner
;
222 const char *mod_name
; /* used for built-in modules */
224 bool suppress_bind_attrs
; /* disables bind/unbind via sysfs */
226 const struct of_device_id
*of_match_table
;
227 const struct acpi_device_id
*acpi_match_table
;
229 int (*probe
) (struct device
*dev
);
230 int (*remove
) (struct device
*dev
);
231 void (*shutdown
) (struct device
*dev
);
232 int (*suspend
) (struct device
*dev
, pm_message_t state
);
233 int (*resume
) (struct device
*dev
);
234 const struct attribute_group
**groups
;
236 const struct dev_pm_ops
*pm
;
238 struct driver_private
*p
;
242 extern int __must_check
driver_register(struct device_driver
*drv
);
243 extern void driver_unregister(struct device_driver
*drv
);
245 extern struct device_driver
*driver_find(const char *name
,
246 struct bus_type
*bus
);
247 extern int driver_probe_done(void);
248 extern void wait_for_device_probe(void);
251 /* sysfs interface for exporting driver attributes */
253 struct driver_attribute
{
254 struct attribute attr
;
255 ssize_t (*show
)(struct device_driver
*driver
, char *buf
);
256 ssize_t (*store
)(struct device_driver
*driver
, const char *buf
,
260 #define DRIVER_ATTR(_name, _mode, _show, _store) \
261 struct driver_attribute driver_attr_##_name = \
262 __ATTR(_name, _mode, _show, _store)
264 extern int __must_check
driver_create_file(struct device_driver
*driver
,
265 const struct driver_attribute
*attr
);
266 extern void driver_remove_file(struct device_driver
*driver
,
267 const struct driver_attribute
*attr
);
269 extern int __must_check
driver_for_each_device(struct device_driver
*drv
,
270 struct device
*start
,
272 int (*fn
)(struct device
*dev
,
274 struct device
*driver_find_device(struct device_driver
*drv
,
275 struct device
*start
, void *data
,
276 int (*match
)(struct device
*dev
, void *data
));
279 * struct subsys_interface - interfaces to device functions
280 * @name: name of the device function
281 * @subsys: subsytem of the devices to attach to
282 * @node: the list of functions registered at the subsystem
283 * @add_dev: device hookup to device function handler
284 * @remove_dev: device hookup to device function handler
286 * Simple interfaces attached to a subsystem. Multiple interfaces can
287 * attach to a subsystem and its devices. Unlike drivers, they do not
288 * exclusively claim or control devices. Interfaces usually represent
289 * a specific functionality of a subsystem/class of devices.
291 struct subsys_interface
{
293 struct bus_type
*subsys
;
294 struct list_head node
;
295 int (*add_dev
)(struct device
*dev
, struct subsys_interface
*sif
);
296 int (*remove_dev
)(struct device
*dev
, struct subsys_interface
*sif
);
299 int subsys_interface_register(struct subsys_interface
*sif
);
300 void subsys_interface_unregister(struct subsys_interface
*sif
);
302 int subsys_system_register(struct bus_type
*subsys
,
303 const struct attribute_group
**groups
);
306 * struct class - device classes
307 * @name: Name of the class.
308 * @owner: The module owner.
309 * @class_attrs: Default attributes of this class.
310 * @dev_attrs: Default attributes of the devices belong to the class.
311 * @dev_bin_attrs: Default binary attributes of the devices belong to the class.
312 * @dev_kobj: The kobject that represents this class and links it into the hierarchy.
313 * @dev_uevent: Called when a device is added, removed from this class, or a
314 * few other things that generate uevents to add the environment
316 * @devnode: Callback to provide the devtmpfs.
317 * @class_release: Called to release this class.
318 * @dev_release: Called to release the device.
319 * @suspend: Used to put the device to sleep mode, usually to a low power
321 * @resume: Used to bring the device from the sleep mode.
322 * @ns_type: Callbacks so sysfs can detemine namespaces.
323 * @namespace: Namespace of the device belongs to this class.
324 * @pm: The default device power management operations of this class.
325 * @p: The private data of the driver core, no one other than the
326 * driver core can touch this.
328 * A class is a higher-level view of a device that abstracts out low-level
329 * implementation details. Drivers may see a SCSI disk or an ATA disk, but,
330 * at the class level, they are all simply disks. Classes allow user space
331 * to work with devices based on what they do, rather than how they are
332 * connected or how they work.
336 struct module
*owner
;
338 struct class_attribute
*class_attrs
;
339 struct device_attribute
*dev_attrs
;
340 struct bin_attribute
*dev_bin_attrs
;
341 struct kobject
*dev_kobj
;
343 int (*dev_uevent
)(struct device
*dev
, struct kobj_uevent_env
*env
);
344 char *(*devnode
)(struct device
*dev
, umode_t
*mode
);
346 void (*class_release
)(struct class *class);
347 void (*dev_release
)(struct device
*dev
);
349 int (*suspend
)(struct device
*dev
, pm_message_t state
);
350 int (*resume
)(struct device
*dev
);
352 const struct kobj_ns_type_operations
*ns_type
;
353 const void *(*namespace)(struct device
*dev
);
355 const struct dev_pm_ops
*pm
;
357 struct subsys_private
*p
;
360 struct class_dev_iter
{
361 struct klist_iter ki
;
362 const struct device_type
*type
;
365 extern struct kobject
*sysfs_dev_block_kobj
;
366 extern struct kobject
*sysfs_dev_char_kobj
;
367 extern int __must_check
__class_register(struct class *class,
368 struct lock_class_key
*key
);
369 extern void class_unregister(struct class *class);
371 /* This is a #define to keep the compiler from merging different
372 * instances of the __key variable */
373 #define class_register(class) \
375 static struct lock_class_key __key; \
376 __class_register(class, &__key); \
380 struct class_compat
*class_compat_register(const char *name
);
381 void class_compat_unregister(struct class_compat
*cls
);
382 int class_compat_create_link(struct class_compat
*cls
, struct device
*dev
,
383 struct device
*device_link
);
384 void class_compat_remove_link(struct class_compat
*cls
, struct device
*dev
,
385 struct device
*device_link
);
387 extern void class_dev_iter_init(struct class_dev_iter
*iter
,
389 struct device
*start
,
390 const struct device_type
*type
);
391 extern struct device
*class_dev_iter_next(struct class_dev_iter
*iter
);
392 extern void class_dev_iter_exit(struct class_dev_iter
*iter
);
394 extern int class_for_each_device(struct class *class, struct device
*start
,
396 int (*fn
)(struct device
*dev
, void *data
));
397 extern struct device
*class_find_device(struct class *class,
398 struct device
*start
, void *data
,
399 int (*match
)(struct device
*, void *));
401 struct class_attribute
{
402 struct attribute attr
;
403 ssize_t (*show
)(struct class *class, struct class_attribute
*attr
,
405 ssize_t (*store
)(struct class *class, struct class_attribute
*attr
,
406 const char *buf
, size_t count
);
407 const void *(*namespace)(struct class *class,
408 const struct class_attribute
*attr
);
411 #define CLASS_ATTR(_name, _mode, _show, _store) \
412 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
414 extern int __must_check
class_create_file(struct class *class,
415 const struct class_attribute
*attr
);
416 extern void class_remove_file(struct class *class,
417 const struct class_attribute
*attr
);
419 /* Simple class attribute that is just a static string */
421 struct class_attribute_string
{
422 struct class_attribute attr
;
426 /* Currently read-only only */
427 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
428 { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
429 #define CLASS_ATTR_STRING(_name, _mode, _str) \
430 struct class_attribute_string class_attr_##_name = \
431 _CLASS_ATTR_STRING(_name, _mode, _str)
433 extern ssize_t
show_class_attr_string(struct class *class, struct class_attribute
*attr
,
436 struct class_interface
{
437 struct list_head node
;
440 int (*add_dev
) (struct device
*, struct class_interface
*);
441 void (*remove_dev
) (struct device
*, struct class_interface
*);
444 extern int __must_check
class_interface_register(struct class_interface
*);
445 extern void class_interface_unregister(struct class_interface
*);
447 extern struct class * __must_check
__class_create(struct module
*owner
,
449 struct lock_class_key
*key
);
450 extern void class_destroy(struct class *cls
);
452 /* This is a #define to keep the compiler from merging different
453 * instances of the __key variable */
454 #define class_create(owner, name) \
456 static struct lock_class_key __key; \
457 __class_create(owner, name, &__key); \
461 * The type of device, "struct device" is embedded in. A class
462 * or bus can contain devices of different types
463 * like "partitions" and "disks", "mouse" and "event".
464 * This identifies the device type and carries type-specific
465 * information, equivalent to the kobj_type of a kobject.
466 * If "name" is specified, the uevent will contain it in
467 * the DEVTYPE variable.
471 const struct attribute_group
**groups
;
472 int (*uevent
)(struct device
*dev
, struct kobj_uevent_env
*env
);
473 char *(*devnode
)(struct device
*dev
, umode_t
*mode
);
474 void (*release
)(struct device
*dev
);
476 const struct dev_pm_ops
*pm
;
479 /* interface for exporting device attributes */
480 struct device_attribute
{
481 struct attribute attr
;
482 ssize_t (*show
)(struct device
*dev
, struct device_attribute
*attr
,
484 ssize_t (*store
)(struct device
*dev
, struct device_attribute
*attr
,
485 const char *buf
, size_t count
);
488 struct dev_ext_attribute
{
489 struct device_attribute attr
;
493 ssize_t
device_show_ulong(struct device
*dev
, struct device_attribute
*attr
,
495 ssize_t
device_store_ulong(struct device
*dev
, struct device_attribute
*attr
,
496 const char *buf
, size_t count
);
497 ssize_t
device_show_int(struct device
*dev
, struct device_attribute
*attr
,
499 ssize_t
device_store_int(struct device
*dev
, struct device_attribute
*attr
,
500 const char *buf
, size_t count
);
501 ssize_t
device_show_bool(struct device
*dev
, struct device_attribute
*attr
,
503 ssize_t
device_store_bool(struct device
*dev
, struct device_attribute
*attr
,
504 const char *buf
, size_t count
);
506 #define DEVICE_ATTR(_name, _mode, _show, _store) \
507 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
508 #define DEVICE_ULONG_ATTR(_name, _mode, _var) \
509 struct dev_ext_attribute dev_attr_##_name = \
510 { __ATTR(_name, _mode, device_show_ulong, device_store_ulong), &(_var) }
511 #define DEVICE_INT_ATTR(_name, _mode, _var) \
512 struct dev_ext_attribute dev_attr_##_name = \
513 { __ATTR(_name, _mode, device_show_int, device_store_int), &(_var) }
514 #define DEVICE_BOOL_ATTR(_name, _mode, _var) \
515 struct dev_ext_attribute dev_attr_##_name = \
516 { __ATTR(_name, _mode, device_show_bool, device_store_bool), &(_var) }
517 #define DEVICE_ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) \
518 struct device_attribute dev_attr_##_name = \
519 __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store)
521 extern int device_create_file(struct device
*device
,
522 const struct device_attribute
*entry
);
523 extern void device_remove_file(struct device
*dev
,
524 const struct device_attribute
*attr
);
525 extern int __must_check
device_create_bin_file(struct device
*dev
,
526 const struct bin_attribute
*attr
);
527 extern void device_remove_bin_file(struct device
*dev
,
528 const struct bin_attribute
*attr
);
529 extern int device_schedule_callback_owner(struct device
*dev
,
530 void (*func
)(struct device
*dev
), struct module
*owner
);
532 /* This is a macro to avoid include problems with THIS_MODULE */
533 #define device_schedule_callback(dev, func) \
534 device_schedule_callback_owner(dev, func, THIS_MODULE)
536 /* device resource management */
537 typedef void (*dr_release_t
)(struct device
*dev
, void *res
);
538 typedef int (*dr_match_t
)(struct device
*dev
, void *res
, void *match_data
);
540 #ifdef CONFIG_DEBUG_DEVRES
541 extern void *__devres_alloc(dr_release_t release
, size_t size
, gfp_t gfp
,
543 #define devres_alloc(release, size, gfp) \
544 __devres_alloc(release, size, gfp, #release)
546 extern void *devres_alloc(dr_release_t release
, size_t size
, gfp_t gfp
);
548 extern void devres_for_each_res(struct device
*dev
, dr_release_t release
,
549 dr_match_t match
, void *match_data
,
550 void (*fn
)(struct device
*, void *, void *),
552 extern void devres_free(void *res
);
553 extern void devres_add(struct device
*dev
, void *res
);
554 extern void *devres_find(struct device
*dev
, dr_release_t release
,
555 dr_match_t match
, void *match_data
);
556 extern void *devres_get(struct device
*dev
, void *new_res
,
557 dr_match_t match
, void *match_data
);
558 extern void *devres_remove(struct device
*dev
, dr_release_t release
,
559 dr_match_t match
, void *match_data
);
560 extern int devres_destroy(struct device
*dev
, dr_release_t release
,
561 dr_match_t match
, void *match_data
);
562 extern int devres_release(struct device
*dev
, dr_release_t release
,
563 dr_match_t match
, void *match_data
);
566 extern void * __must_check
devres_open_group(struct device
*dev
, void *id
,
568 extern void devres_close_group(struct device
*dev
, void *id
);
569 extern void devres_remove_group(struct device
*dev
, void *id
);
570 extern int devres_release_group(struct device
*dev
, void *id
);
572 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
573 extern void *devm_kzalloc(struct device
*dev
, size_t size
, gfp_t gfp
);
574 extern void devm_kfree(struct device
*dev
, void *p
);
576 void __iomem
*devm_request_and_ioremap(struct device
*dev
,
577 struct resource
*res
);
579 struct device_dma_parameters
{
581 * a low level driver may set these to teach IOMMU code about
584 unsigned int max_segment_size
;
585 unsigned long segment_boundary_mask
;
588 struct acpi_dev_node
{
595 * struct device - The basic device structure
596 * @parent: The device's "parent" device, the device to which it is attached.
597 * In most cases, a parent device is some sort of bus or host
598 * controller. If parent is NULL, the device, is a top-level device,
599 * which is not usually what you want.
600 * @p: Holds the private data of the driver core portions of the device.
601 * See the comment of the struct device_private for detail.
602 * @kobj: A top-level, abstract class from which other classes are derived.
603 * @init_name: Initial name of the device.
604 * @type: The type of device.
605 * This identifies the device type and carries type-specific
607 * @mutex: Mutex to synchronize calls to its driver.
608 * @bus: Type of bus device is on.
609 * @driver: Which driver has allocated this
610 * @platform_data: Platform data specific to the device.
611 * Example: For devices on custom boards, as typical of embedded
612 * and SOC based hardware, Linux often uses platform_data to point
613 * to board-specific structures describing devices and how they
614 * are wired. That can include what ports are available, chip
615 * variants, which GPIO pins act in what additional roles, and so
616 * on. This shrinks the "Board Support Packages" (BSPs) and
617 * minimizes board-specific #ifdefs in drivers.
618 * @power: For device power management.
619 * See Documentation/power/devices.txt for details.
620 * @pm_domain: Provide callbacks that are executed during system suspend,
621 * hibernation, system resume and during runtime PM transitions
622 * along with subsystem-level and driver-level callbacks.
623 * @numa_node: NUMA node this device is close to.
624 * @dma_mask: Dma mask (if dma'ble device).
625 * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
626 * hardware supports 64-bit addresses for consistent allocations
628 * @dma_parms: A low level driver may set these to teach IOMMU code about
629 * segment limitations.
630 * @dma_pools: Dma pools (if dma'ble device).
631 * @dma_mem: Internal for coherent mem override.
632 * @archdata: For arch-specific additions.
633 * @of_node: Associated device tree node.
634 * @acpi_node: Associated ACPI device node.
635 * @devt: For creating the sysfs "dev".
636 * @id: device instance
637 * @devres_lock: Spinlock to protect the resource of the device.
638 * @devres_head: The resources list of the device.
639 * @knode_class: The node used to add the device to the class list.
640 * @class: The class of the device.
641 * @groups: Optional attribute groups.
642 * @release: Callback to free the device after all references have
643 * gone away. This should be set by the allocator of the
644 * device (i.e. the bus driver that discovered the device).
646 * At the lowest level, every device in a Linux system is represented by an
647 * instance of struct device. The device structure contains the information
648 * that the device model core needs to model the system. Most subsystems,
649 * however, track additional information about the devices they host. As a
650 * result, it is rare for devices to be represented by bare device structures;
651 * instead, that structure, like kobject structures, is usually embedded within
652 * a higher-level representation of the device.
655 struct device
*parent
;
657 struct device_private
*p
;
660 const char *init_name
; /* initial name of the device */
661 const struct device_type
*type
;
663 struct mutex mutex
; /* mutex to synchronize calls to
667 struct bus_type
*bus
; /* type of bus device is on */
668 struct device_driver
*driver
; /* which driver has allocated this
670 void *platform_data
; /* Platform specific data, device
671 core doesn't touch it */
672 struct dev_pm_info power
;
673 struct dev_pm_domain
*pm_domain
;
676 int numa_node
; /* NUMA node this device is close to */
678 u64
*dma_mask
; /* dma mask (if dma'able device) */
679 u64 coherent_dma_mask
;/* Like dma_mask, but for
680 alloc_coherent mappings as
681 not all hardware supports
682 64 bit addresses for consistent
683 allocations such descriptors. */
685 struct device_dma_parameters
*dma_parms
;
687 struct list_head dma_pools
; /* dma pools (if dma'ble) */
689 struct dma_coherent_mem
*dma_mem
; /* internal for coherent mem
692 struct cma
*cma_area
; /* contiguous memory area for dma
695 /* arch specific additions */
696 struct dev_archdata archdata
;
698 struct device_node
*of_node
; /* associated device tree node */
699 struct acpi_dev_node acpi_node
; /* associated ACPI device node */
701 dev_t devt
; /* dev_t, creates the sysfs "dev" */
702 u32 id
; /* device instance */
704 spinlock_t devres_lock
;
705 struct list_head devres_head
;
707 struct klist_node knode_class
;
709 const struct attribute_group
**groups
; /* optional groups */
711 void (*release
)(struct device
*dev
);
712 struct iommu_group
*iommu_group
;
715 static inline struct device
*kobj_to_dev(struct kobject
*kobj
)
717 return container_of(kobj
, struct device
, kobj
);
721 #define ACPI_HANDLE(dev) ((dev)->acpi_node.handle)
722 #define ACPI_HANDLE_SET(dev, _handle_) (dev)->acpi_node.handle = (_handle_)
724 #define ACPI_HANDLE(dev) (NULL)
725 #define ACPI_HANDLE_SET(dev, _handle_) do { } while (0)
728 /* Get the wakeup routines, which depend on struct device */
729 #include <linux/pm_wakeup.h>
731 static inline const char *dev_name(const struct device
*dev
)
733 /* Use the init name until the kobject becomes available */
735 return dev
->init_name
;
737 return kobject_name(&dev
->kobj
);
740 extern __printf(2, 3)
741 int dev_set_name(struct device
*dev
, const char *name
, ...);
744 static inline int dev_to_node(struct device
*dev
)
746 return dev
->numa_node
;
748 static inline void set_dev_node(struct device
*dev
, int node
)
750 dev
->numa_node
= node
;
753 static inline int dev_to_node(struct device
*dev
)
757 static inline void set_dev_node(struct device
*dev
, int node
)
762 static inline struct pm_subsys_data
*dev_to_psd(struct device
*dev
)
764 return dev
? dev
->power
.subsys_data
: NULL
;
767 static inline unsigned int dev_get_uevent_suppress(const struct device
*dev
)
769 return dev
->kobj
.uevent_suppress
;
772 static inline void dev_set_uevent_suppress(struct device
*dev
, int val
)
774 dev
->kobj
.uevent_suppress
= val
;
777 static inline int device_is_registered(struct device
*dev
)
779 return dev
->kobj
.state_in_sysfs
;
782 static inline void device_enable_async_suspend(struct device
*dev
)
784 if (!dev
->power
.is_prepared
)
785 dev
->power
.async_suspend
= true;
788 static inline void device_disable_async_suspend(struct device
*dev
)
790 if (!dev
->power
.is_prepared
)
791 dev
->power
.async_suspend
= false;
794 static inline bool device_async_suspend_enabled(struct device
*dev
)
796 return !!dev
->power
.async_suspend
;
799 static inline void pm_suspend_ignore_children(struct device
*dev
, bool enable
)
801 dev
->power
.ignore_children
= enable
;
804 static inline void dev_pm_syscore_device(struct device
*dev
, bool val
)
806 #ifdef CONFIG_PM_SLEEP
807 dev
->power
.syscore
= val
;
811 static inline void device_lock(struct device
*dev
)
813 mutex_lock(&dev
->mutex
);
816 static inline int device_trylock(struct device
*dev
)
818 return mutex_trylock(&dev
->mutex
);
821 static inline void device_unlock(struct device
*dev
)
823 mutex_unlock(&dev
->mutex
);
826 void driver_init(void);
829 * High level routines for use by the bus drivers
831 extern int __must_check
device_register(struct device
*dev
);
832 extern void device_unregister(struct device
*dev
);
833 extern void device_initialize(struct device
*dev
);
834 extern int __must_check
device_add(struct device
*dev
);
835 extern void device_del(struct device
*dev
);
836 extern int device_for_each_child(struct device
*dev
, void *data
,
837 int (*fn
)(struct device
*dev
, void *data
));
838 extern struct device
*device_find_child(struct device
*dev
, void *data
,
839 int (*match
)(struct device
*dev
, void *data
));
840 extern int device_rename(struct device
*dev
, const char *new_name
);
841 extern int device_move(struct device
*dev
, struct device
*new_parent
,
842 enum dpm_order dpm_order
);
843 extern const char *device_get_devnode(struct device
*dev
,
844 umode_t
*mode
, const char **tmp
);
845 extern void *dev_get_drvdata(const struct device
*dev
);
846 extern int dev_set_drvdata(struct device
*dev
, void *data
);
849 * Root device objects for grouping under /sys/devices
851 extern struct device
*__root_device_register(const char *name
,
852 struct module
*owner
);
855 * This is a macro to avoid include problems with THIS_MODULE,
856 * just as per what is done for device_schedule_callback() above.
858 #define root_device_register(name) \
859 __root_device_register(name, THIS_MODULE)
861 extern void root_device_unregister(struct device
*root
);
863 static inline void *dev_get_platdata(const struct device
*dev
)
865 return dev
->platform_data
;
869 * Manual binding of a device to driver. See drivers/base/bus.c
870 * for information on use.
872 extern int __must_check
device_bind_driver(struct device
*dev
);
873 extern void device_release_driver(struct device
*dev
);
874 extern int __must_check
device_attach(struct device
*dev
);
875 extern int __must_check
driver_attach(struct device_driver
*drv
);
876 extern int __must_check
device_reprobe(struct device
*dev
);
879 * Easy functions for dynamically creating devices on the fly
881 extern struct device
*device_create_vargs(struct class *cls
,
882 struct device
*parent
,
887 extern __printf(5, 6)
888 struct device
*device_create(struct class *cls
, struct device
*parent
,
889 dev_t devt
, void *drvdata
,
890 const char *fmt
, ...);
891 extern void device_destroy(struct class *cls
, dev_t devt
);
894 * Platform "fixup" functions - allow the platform to have their say
895 * about devices and actions that the general device layer doesn't
898 /* Notify platform of device discovery */
899 extern int (*platform_notify
)(struct device
*dev
);
901 extern int (*platform_notify_remove
)(struct device
*dev
);
905 * get_device - atomically increment the reference count for the device.
908 extern struct device
*get_device(struct device
*dev
);
909 extern void put_device(struct device
*dev
);
911 #ifdef CONFIG_DEVTMPFS
912 extern int devtmpfs_create_node(struct device
*dev
);
913 extern int devtmpfs_delete_node(struct device
*dev
);
914 extern int devtmpfs_mount(const char *mntdir
);
916 static inline int devtmpfs_create_node(struct device
*dev
) { return 0; }
917 static inline int devtmpfs_delete_node(struct device
*dev
) { return 0; }
918 static inline int devtmpfs_mount(const char *mountpoint
) { return 0; }
921 /* drivers/base/power/shutdown.c */
922 extern void device_shutdown(void);
924 /* debugging and troubleshooting/diagnostic helpers. */
925 extern const char *dev_driver_string(const struct device
*dev
);
930 extern __printf(3, 0)
931 int dev_vprintk_emit(int level
, const struct device
*dev
,
932 const char *fmt
, va_list args
);
933 extern __printf(3, 4)
934 int dev_printk_emit(int level
, const struct device
*dev
, const char *fmt
, ...);
936 extern __printf(3, 4)
937 int dev_printk(const char *level
, const struct device
*dev
,
938 const char *fmt
, ...);
939 extern __printf(2, 3)
940 int dev_emerg(const struct device
*dev
, const char *fmt
, ...);
941 extern __printf(2, 3)
942 int dev_alert(const struct device
*dev
, const char *fmt
, ...);
943 extern __printf(2, 3)
944 int dev_crit(const struct device
*dev
, const char *fmt
, ...);
945 extern __printf(2, 3)
946 int dev_err(const struct device
*dev
, const char *fmt
, ...);
947 extern __printf(2, 3)
948 int dev_warn(const struct device
*dev
, const char *fmt
, ...);
949 extern __printf(2, 3)
950 int dev_notice(const struct device
*dev
, const char *fmt
, ...);
951 extern __printf(2, 3)
952 int _dev_info(const struct device
*dev
, const char *fmt
, ...);
956 static inline __printf(3, 0)
957 int dev_vprintk_emit(int level
, const struct device
*dev
,
958 const char *fmt
, va_list args
)
960 static inline __printf(3, 4)
961 int dev_printk_emit(int level
, const struct device
*dev
, const char *fmt
, ...)
964 static inline int __dev_printk(const char *level
, const struct device
*dev
,
965 struct va_format
*vaf
)
967 static inline __printf(3, 4)
968 int dev_printk(const char *level
, const struct device
*dev
,
969 const char *fmt
, ...)
972 static inline __printf(2, 3)
973 int dev_emerg(const struct device
*dev
, const char *fmt
, ...)
975 static inline __printf(2, 3)
976 int dev_crit(const struct device
*dev
, const char *fmt
, ...)
978 static inline __printf(2, 3)
979 int dev_alert(const struct device
*dev
, const char *fmt
, ...)
981 static inline __printf(2, 3)
982 int dev_err(const struct device
*dev
, const char *fmt
, ...)
984 static inline __printf(2, 3)
985 int dev_warn(const struct device
*dev
, const char *fmt
, ...)
987 static inline __printf(2, 3)
988 int dev_notice(const struct device
*dev
, const char *fmt
, ...)
990 static inline __printf(2, 3)
991 int _dev_info(const struct device
*dev
, const char *fmt
, ...)
997 * Stupid hackaround for existing uses of non-printk uses dev_info
999 * Note that the definition of dev_info below is actually _dev_info
1000 * and a macro is used to avoid redefining dev_info
1003 #define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)
1005 #if defined(CONFIG_DYNAMIC_DEBUG)
1006 #define dev_dbg(dev, format, ...) \
1008 dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
1010 #elif defined(DEBUG)
1011 #define dev_dbg(dev, format, arg...) \
1012 dev_printk(KERN_DEBUG, dev, format, ##arg)
1014 #define dev_dbg(dev, format, arg...) \
1017 dev_printk(KERN_DEBUG, dev, format, ##arg); \
1022 #define dev_level_ratelimited(dev_level, dev, fmt, ...) \
1024 static DEFINE_RATELIMIT_STATE(_rs, \
1025 DEFAULT_RATELIMIT_INTERVAL, \
1026 DEFAULT_RATELIMIT_BURST); \
1027 if (__ratelimit(&_rs)) \
1028 dev_level(dev, fmt, ##__VA_ARGS__); \
1031 #define dev_emerg_ratelimited(dev, fmt, ...) \
1032 dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__)
1033 #define dev_alert_ratelimited(dev, fmt, ...) \
1034 dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__)
1035 #define dev_crit_ratelimited(dev, fmt, ...) \
1036 dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__)
1037 #define dev_err_ratelimited(dev, fmt, ...) \
1038 dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__)
1039 #define dev_warn_ratelimited(dev, fmt, ...) \
1040 dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__)
1041 #define dev_notice_ratelimited(dev, fmt, ...) \
1042 dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
1043 #define dev_info_ratelimited(dev, fmt, ...) \
1044 dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
1045 #if defined(CONFIG_DYNAMIC_DEBUG) || defined(DEBUG)
1046 #define dev_dbg_ratelimited(dev, fmt, ...) \
1048 static DEFINE_RATELIMIT_STATE(_rs, \
1049 DEFAULT_RATELIMIT_INTERVAL, \
1050 DEFAULT_RATELIMIT_BURST); \
1051 DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
1052 if (unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT) && \
1053 __ratelimit(&_rs)) \
1054 __dynamic_pr_debug(&descriptor, pr_fmt(fmt), \
1058 #define dev_dbg_ratelimited(dev, fmt, ...) \
1059 no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
1062 #ifdef VERBOSE_DEBUG
1063 #define dev_vdbg dev_dbg
1065 #define dev_vdbg(dev, format, arg...) \
1068 dev_printk(KERN_DEBUG, dev, format, ##arg); \
1074 * dev_WARN*() acts like dev_printk(), but with the key difference
1075 * of using a WARN/WARN_ON to get the message out, including the
1076 * file/line information and a backtrace.
1078 #define dev_WARN(dev, format, arg...) \
1079 WARN(1, "Device: %s\n" format, dev_driver_string(dev), ## arg);
1081 #define dev_WARN_ONCE(dev, condition, format, arg...) \
1082 WARN_ONCE(condition, "Device %s\n" format, \
1083 dev_driver_string(dev), ## arg)
1085 /* Create alias, so I can be autoloaded. */
1086 #define MODULE_ALIAS_CHARDEV(major,minor) \
1087 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
1088 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
1089 MODULE_ALIAS("char-major-" __stringify(major) "-*")
1091 #ifdef CONFIG_SYSFS_DEPRECATED
1092 extern long sysfs_deprecated
;
1094 #define sysfs_deprecated 0
1098 * module_driver() - Helper macro for drivers that don't do anything
1099 * special in module init/exit. This eliminates a lot of boilerplate.
1100 * Each module may only use this macro once, and calling it replaces
1101 * module_init() and module_exit().
1103 * @__driver: driver name
1104 * @__register: register function for this driver type
1105 * @__unregister: unregister function for this driver type
1106 * @...: Additional arguments to be passed to __register and __unregister.
1108 * Use this macro to construct bus specific macros for registering
1109 * drivers, and do not use it on its own.
1111 #define module_driver(__driver, __register, __unregister, ...) \
1112 static int __init __driver##_init(void) \
1114 return __register(&(__driver) , ##__VA_ARGS__); \
1116 module_init(__driver##_init); \
1117 static void __exit __driver##_exit(void) \
1119 __unregister(&(__driver) , ##__VA_ARGS__); \
1121 module_exit(__driver##_exit);
1123 #endif /* _DEVICE_H_ */
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