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 <asm/device.h>
29 struct device_private;
31 struct driver_private;
34 struct subsys_private;
39 struct bus_attribute {
40 struct attribute attr;
41 ssize_t (*show)(struct bus_type *bus, char *buf);
42 ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
45 #define BUS_ATTR(_name, _mode, _show, _store) \
46 struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
48 extern int __must_check bus_create_file(struct bus_type *,
49 struct bus_attribute *);
50 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
53 * struct bus_type - The bus type of the device
55 * @name: The name of the bus.
56 * @bus_attrs: Default attributes of the bus.
57 * @dev_attrs: Default attributes of the devices on the bus.
58 * @drv_attrs: Default attributes of the device drivers on the bus.
59 * @match: Called, perhaps multiple times, whenever a new device or driver
60 * is added for this bus. It should return a nonzero value if the
61 * given device can be handled by the given driver.
62 * @uevent: Called when a device is added, removed, or a few other things
63 * that generate uevents to add the environment variables.
64 * @probe: Called when a new device or driver add to this bus, and callback
65 * the specific driver's probe to initial the matched device.
66 * @remove: Called when a device removed from this bus.
67 * @shutdown: Called at shut-down time to quiesce the device.
68 * @suspend: Called when a device on this bus wants to go to sleep mode.
69 * @resume: Called to bring a device on this bus out of sleep mode.
70 * @pm: Power management operations of this bus, callback the specific
71 * device driver's pm-ops.
72 * @iommu_ops IOMMU specific operations for this bus, used to attach IOMMU
73 * driver implementations to a bus and allow the driver to do
75 * @p: The private data of the driver core, only the driver core can
78 * A bus is a channel between the processor and one or more devices. For the
79 * purposes of the device model, all devices are connected via a bus, even if
80 * it is an internal, virtual, "platform" bus. Buses can plug into each other.
81 * A USB controller is usually a PCI device, for example. The device model
82 * represents the actual connections between buses and the devices they control.
83 * A bus is represented by the bus_type structure. It contains the name, the
84 * default attributes, the bus' methods, PM operations, and the driver core's
89 struct bus_attribute *bus_attrs;
90 struct device_attribute *dev_attrs;
91 struct driver_attribute *drv_attrs;
93 int (*match)(struct device *dev, struct device_driver *drv);
94 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
95 int (*probe)(struct device *dev);
96 int (*remove)(struct device *dev);
97 void (*shutdown)(struct device *dev);
99 int (*suspend)(struct device *dev, pm_message_t state);
100 int (*resume)(struct device *dev);
102 const struct dev_pm_ops *pm;
104 struct iommu_ops *iommu_ops;
106 struct subsys_private *p;
109 extern int __must_check bus_register(struct bus_type *bus);
110 extern void bus_unregister(struct bus_type *bus);
112 extern int __must_check bus_rescan_devices(struct bus_type *bus);
114 /* iterator helpers for buses */
116 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
117 int (*fn)(struct device *dev, void *data));
118 struct device *bus_find_device(struct bus_type *bus, struct device *start,
120 int (*match)(struct device *dev, void *data));
121 struct device *bus_find_device_by_name(struct bus_type *bus,
122 struct device *start,
125 int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,
126 void *data, int (*fn)(struct device_driver *, void *));
128 void bus_sort_breadthfirst(struct bus_type *bus,
129 int (*compare)(const struct device *a,
130 const struct device *b));
132 * Bus notifiers: Get notified of addition/removal of devices
133 * and binding/unbinding of drivers to devices.
134 * In the long run, it should be a replacement for the platform
137 struct notifier_block;
139 extern int bus_register_notifier(struct bus_type *bus,
140 struct notifier_block *nb);
141 extern int bus_unregister_notifier(struct bus_type *bus,
142 struct notifier_block *nb);
144 /* All 4 notifers below get called with the target struct device *
145 * as an argument. Note that those functions are likely to be called
146 * with the device lock held in the core, so be careful.
148 #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
149 #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device removed */
150 #define BUS_NOTIFY_BIND_DRIVER 0x00000003 /* driver about to be
152 #define BUS_NOTIFY_BOUND_DRIVER 0x00000004 /* driver bound to device */
153 #define BUS_NOTIFY_UNBIND_DRIVER 0x00000005 /* driver about to be
155 #define BUS_NOTIFY_UNBOUND_DRIVER 0x00000006 /* driver is unbound
158 extern struct kset *bus_get_kset(struct bus_type *bus);
159 extern struct klist *bus_get_device_klist(struct bus_type *bus);
162 * struct device_driver - The basic device driver structure
163 * @name: Name of the device driver.
164 * @bus: The bus which the device of this driver belongs to.
165 * @owner: The module owner.
166 * @mod_name: Used for built-in modules.
167 * @suppress_bind_attrs: Disables bind/unbind via sysfs.
168 * @of_match_table: The open firmware table.
169 * @probe: Called to query the existence of a specific device,
170 * whether this driver can work with it, and bind the driver
171 * to a specific device.
172 * @remove: Called when the device is removed from the system to
173 * unbind a device from this driver.
174 * @shutdown: Called at shut-down time to quiesce the device.
175 * @suspend: Called to put the device to sleep mode. Usually to a
177 * @resume: Called to bring a device from sleep mode.
178 * @groups: Default attributes that get created by the driver core
180 * @pm: Power management operations of the device which matched
182 * @p: Driver core's private data, no one other than the driver
183 * core can touch this.
185 * The device driver-model tracks all of the drivers known to the system.
186 * The main reason for this tracking is to enable the driver core to match
187 * up drivers with new devices. Once drivers are known objects within the
188 * system, however, a number of other things become possible. Device drivers
189 * can export information and configuration variables that are independent
190 * of any specific device.
192 struct device_driver {
194 struct bus_type *bus;
196 struct module *owner;
197 const char *mod_name; /* used for built-in modules */
199 bool suppress_bind_attrs; /* disables bind/unbind via sysfs */
201 const struct of_device_id *of_match_table;
203 int (*probe) (struct device *dev);
204 int (*remove) (struct device *dev);
205 void (*shutdown) (struct device *dev);
206 int (*suspend) (struct device *dev, pm_message_t state);
207 int (*resume) (struct device *dev);
208 const struct attribute_group **groups;
210 const struct dev_pm_ops *pm;
212 struct driver_private *p;
216 extern int __must_check driver_register(struct device_driver *drv);
217 extern void driver_unregister(struct device_driver *drv);
219 extern struct device_driver *get_driver(struct device_driver *drv);
220 extern void put_driver(struct device_driver *drv);
221 extern struct device_driver *driver_find(const char *name,
222 struct bus_type *bus);
223 extern int driver_probe_done(void);
224 extern void wait_for_device_probe(void);
227 /* sysfs interface for exporting driver attributes */
229 struct driver_attribute {
230 struct attribute attr;
231 ssize_t (*show)(struct device_driver *driver, char *buf);
232 ssize_t (*store)(struct device_driver *driver, const char *buf,
236 #define DRIVER_ATTR(_name, _mode, _show, _store) \
237 struct driver_attribute driver_attr_##_name = \
238 __ATTR(_name, _mode, _show, _store)
240 extern int __must_check driver_create_file(struct device_driver *driver,
241 const struct driver_attribute *attr);
242 extern void driver_remove_file(struct device_driver *driver,
243 const struct driver_attribute *attr);
245 extern int __must_check driver_add_kobj(struct device_driver *drv,
246 struct kobject *kobj,
247 const char *fmt, ...);
249 extern int __must_check driver_for_each_device(struct device_driver *drv,
250 struct device *start,
252 int (*fn)(struct device *dev,
254 struct device *driver_find_device(struct device_driver *drv,
255 struct device *start, void *data,
256 int (*match)(struct device *dev, void *data));
259 * struct class - device classes
260 * @name: Name of the class.
261 * @owner: The module owner.
262 * @class_attrs: Default attributes of this class.
263 * @dev_attrs: Default attributes of the devices belong to the class.
264 * @dev_bin_attrs: Default binary attributes of the devices belong to the class.
265 * @dev_kobj: The kobject that represents this class and links it into the hierarchy.
266 * @dev_uevent: Called when a device is added, removed from this class, or a
267 * few other things that generate uevents to add the environment
269 * @devnode: Callback to provide the devtmpfs.
270 * @class_release: Called to release this class.
271 * @dev_release: Called to release the device.
272 * @suspend: Used to put the device to sleep mode, usually to a low power
274 * @resume: Used to bring the device from the sleep mode.
275 * @ns_type: Callbacks so sysfs can detemine namespaces.
276 * @namespace: Namespace of the device belongs to this class.
277 * @pm: The default device power management operations of this class.
278 * @p: The private data of the driver core, no one other than the
279 * driver core can touch this.
281 * A class is a higher-level view of a device that abstracts out low-level
282 * implementation details. Drivers may see a SCSI disk or an ATA disk, but,
283 * at the class level, they are all simply disks. Classes allow user space
284 * to work with devices based on what they do, rather than how they are
285 * connected or how they work.
289 struct module *owner;
291 struct class_attribute *class_attrs;
292 struct device_attribute *dev_attrs;
293 struct bin_attribute *dev_bin_attrs;
294 struct kobject *dev_kobj;
296 int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
297 char *(*devnode)(struct device *dev, mode_t *mode);
299 void (*class_release)(struct class *class);
300 void (*dev_release)(struct device *dev);
302 int (*suspend)(struct device *dev, pm_message_t state);
303 int (*resume)(struct device *dev);
305 const struct kobj_ns_type_operations *ns_type;
306 const void *(*namespace)(struct device *dev);
308 const struct dev_pm_ops *pm;
310 struct subsys_private *p;
313 struct class_dev_iter {
314 struct klist_iter ki;
315 const struct device_type *type;
318 extern struct kobject *sysfs_dev_block_kobj;
319 extern struct kobject *sysfs_dev_char_kobj;
320 extern int __must_check __class_register(struct class *class,
321 struct lock_class_key *key);
322 extern void class_unregister(struct class *class);
324 /* This is a #define to keep the compiler from merging different
325 * instances of the __key variable */
326 #define class_register(class) \
328 static struct lock_class_key __key; \
329 __class_register(class, &__key); \
333 struct class_compat *class_compat_register(const char *name);
334 void class_compat_unregister(struct class_compat *cls);
335 int class_compat_create_link(struct class_compat *cls, struct device *dev,
336 struct device *device_link);
337 void class_compat_remove_link(struct class_compat *cls, struct device *dev,
338 struct device *device_link);
340 extern void class_dev_iter_init(struct class_dev_iter *iter,
342 struct device *start,
343 const struct device_type *type);
344 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
345 extern void class_dev_iter_exit(struct class_dev_iter *iter);
347 extern int class_for_each_device(struct class *class, struct device *start,
349 int (*fn)(struct device *dev, void *data));
350 extern struct device *class_find_device(struct class *class,
351 struct device *start, void *data,
352 int (*match)(struct device *, void *));
354 struct class_attribute {
355 struct attribute attr;
356 ssize_t (*show)(struct class *class, struct class_attribute *attr,
358 ssize_t (*store)(struct class *class, struct class_attribute *attr,
359 const char *buf, size_t count);
360 const void *(*namespace)(struct class *class,
361 const struct class_attribute *attr);
364 #define CLASS_ATTR(_name, _mode, _show, _store) \
365 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
367 extern int __must_check class_create_file(struct class *class,
368 const struct class_attribute *attr);
369 extern void class_remove_file(struct class *class,
370 const struct class_attribute *attr);
372 /* Simple class attribute that is just a static string */
374 struct class_attribute_string {
375 struct class_attribute attr;
379 /* Currently read-only only */
380 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
381 { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
382 #define CLASS_ATTR_STRING(_name, _mode, _str) \
383 struct class_attribute_string class_attr_##_name = \
384 _CLASS_ATTR_STRING(_name, _mode, _str)
386 extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
389 struct class_interface {
390 struct list_head node;
393 int (*add_dev) (struct device *, struct class_interface *);
394 void (*remove_dev) (struct device *, struct class_interface *);
397 extern int __must_check class_interface_register(struct class_interface *);
398 extern void class_interface_unregister(struct class_interface *);
400 extern struct class * __must_check __class_create(struct module *owner,
402 struct lock_class_key *key);
403 extern void class_destroy(struct class *cls);
405 /* This is a #define to keep the compiler from merging different
406 * instances of the __key variable */
407 #define class_create(owner, name) \
409 static struct lock_class_key __key; \
410 __class_create(owner, name, &__key); \
414 * The type of device, "struct device" is embedded in. A class
415 * or bus can contain devices of different types
416 * like "partitions" and "disks", "mouse" and "event".
417 * This identifies the device type and carries type-specific
418 * information, equivalent to the kobj_type of a kobject.
419 * If "name" is specified, the uevent will contain it in
420 * the DEVTYPE variable.
424 const struct attribute_group **groups;
425 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
426 char *(*devnode)(struct device *dev, mode_t *mode);
427 void (*release)(struct device *dev);
429 const struct dev_pm_ops *pm;
432 /* interface for exporting device attributes */
433 struct device_attribute {
434 struct attribute attr;
435 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
437 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
438 const char *buf, size_t count);
441 #define DEVICE_ATTR(_name, _mode, _show, _store) \
442 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
444 extern int __must_check device_create_file(struct device *device,
445 const struct device_attribute *entry);
446 extern void device_remove_file(struct device *dev,
447 const struct device_attribute *attr);
448 extern int __must_check device_create_bin_file(struct device *dev,
449 const struct bin_attribute *attr);
450 extern void device_remove_bin_file(struct device *dev,
451 const struct bin_attribute *attr);
452 extern int device_schedule_callback_owner(struct device *dev,
453 void (*func)(struct device *dev), struct module *owner);
455 /* This is a macro to avoid include problems with THIS_MODULE */
456 #define device_schedule_callback(dev, func) \
457 device_schedule_callback_owner(dev, func, THIS_MODULE)
459 /* device resource management */
460 typedef void (*dr_release_t)(struct device *dev, void *res);
461 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
463 #ifdef CONFIG_DEBUG_DEVRES
464 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
466 #define devres_alloc(release, size, gfp) \
467 __devres_alloc(release, size, gfp, #release)
469 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
471 extern void devres_free(void *res);
472 extern void devres_add(struct device *dev, void *res);
473 extern void *devres_find(struct device *dev, dr_release_t release,
474 dr_match_t match, void *match_data);
475 extern void *devres_get(struct device *dev, void *new_res,
476 dr_match_t match, void *match_data);
477 extern void *devres_remove(struct device *dev, dr_release_t release,
478 dr_match_t match, void *match_data);
479 extern int devres_destroy(struct device *dev, dr_release_t release,
480 dr_match_t match, void *match_data);
483 extern void * __must_check devres_open_group(struct device *dev, void *id,
485 extern void devres_close_group(struct device *dev, void *id);
486 extern void devres_remove_group(struct device *dev, void *id);
487 extern int devres_release_group(struct device *dev, void *id);
489 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
490 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
491 extern void devm_kfree(struct device *dev, void *p);
493 void __iomem *devm_request_and_ioremap(struct device *dev,
494 struct resource *res);
496 struct device_dma_parameters {
498 * a low level driver may set these to teach IOMMU code about
501 unsigned int max_segment_size;
502 unsigned long segment_boundary_mask;
506 * struct device - The basic device structure
507 * @parent: The device's "parent" device, the device to which it is attached.
508 * In most cases, a parent device is some sort of bus or host
509 * controller. If parent is NULL, the device, is a top-level device,
510 * which is not usually what you want.
511 * @p: Holds the private data of the driver core portions of the device.
512 * See the comment of the struct device_private for detail.
513 * @kobj: A top-level, abstract class from which other classes are derived.
514 * @init_name: Initial name of the device.
515 * @type: The type of device.
516 * This identifies the device type and carries type-specific
518 * @mutex: Mutex to synchronize calls to its driver.
519 * @bus: Type of bus device is on.
520 * @driver: Which driver has allocated this
521 * @platform_data: Platform data specific to the device.
522 * Example: For devices on custom boards, as typical of embedded
523 * and SOC based hardware, Linux often uses platform_data to point
524 * to board-specific structures describing devices and how they
525 * are wired. That can include what ports are available, chip
526 * variants, which GPIO pins act in what additional roles, and so
527 * on. This shrinks the "Board Support Packages" (BSPs) and
528 * minimizes board-specific #ifdefs in drivers.
529 * @power: For device power management.
530 * See Documentation/power/devices.txt for details.
531 * @pm_domain: Provide callbacks that are executed during system suspend,
532 * hibernation, system resume and during runtime PM transitions
533 * along with subsystem-level and driver-level callbacks.
534 * @numa_node: NUMA node this device is close to.
535 * @dma_mask: Dma mask (if dma'ble device).
536 * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
537 * hardware supports 64-bit addresses for consistent allocations
539 * @dma_parms: A low level driver may set these to teach IOMMU code about
540 * segment limitations.
541 * @dma_pools: Dma pools (if dma'ble device).
542 * @dma_mem: Internal for coherent mem override.
543 * @archdata: For arch-specific additions.
544 * @of_node: Associated device tree node.
545 * @devt: For creating the sysfs "dev".
546 * @devres_lock: Spinlock to protect the resource of the device.
547 * @devres_head: The resources list of the device.
548 * @knode_class: The node used to add the device to the class list.
549 * @class: The class of the device.
550 * @groups: Optional attribute groups.
551 * @release: Callback to free the device after all references have
552 * gone away. This should be set by the allocator of the
553 * device (i.e. the bus driver that discovered the device).
555 * At the lowest level, every device in a Linux system is represented by an
556 * instance of struct device. The device structure contains the information
557 * that the device model core needs to model the system. Most subsystems,
558 * however, track additional information about the devices they host. As a
559 * result, it is rare for devices to be represented by bare device structures;
560 * instead, that structure, like kobject structures, is usually embedded within
561 * a higher-level representation of the device.
564 struct device *parent;
566 struct device_private *p;
569 const char *init_name; /* initial name of the device */
570 const struct device_type *type;
572 struct mutex mutex; /* mutex to synchronize calls to
576 struct bus_type *bus; /* type of bus device is on */
577 struct device_driver *driver; /* which driver has allocated this
579 void *platform_data; /* Platform specific data, device
580 core doesn't touch it */
581 struct dev_pm_info power;
582 struct dev_pm_domain *pm_domain;
585 int numa_node; /* NUMA node this device is close to */
587 u64 *dma_mask; /* dma mask (if dma'able device) */
588 u64 coherent_dma_mask;/* Like dma_mask, but for
589 alloc_coherent mappings as
590 not all hardware supports
591 64 bit addresses for consistent
592 allocations such descriptors. */
594 struct device_dma_parameters *dma_parms;
596 struct list_head dma_pools; /* dma pools (if dma'ble) */
598 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
600 /* arch specific additions */
601 struct dev_archdata archdata;
603 struct device_node *of_node; /* associated device tree node */
605 dev_t devt; /* dev_t, creates the sysfs "dev" */
607 spinlock_t devres_lock;
608 struct list_head devres_head;
610 struct klist_node knode_class;
612 const struct attribute_group **groups; /* optional groups */
614 void (*release)(struct device *dev);
617 /* Get the wakeup routines, which depend on struct device */
618 #include <linux/pm_wakeup.h>
620 static inline const char *dev_name(const struct device *dev)
622 /* Use the init name until the kobject becomes available */
624 return dev->init_name;
626 return kobject_name(&dev->kobj);
629 extern __printf(2, 3)
630 int dev_set_name(struct device *dev, const char *name, ...);
633 static inline int dev_to_node(struct device *dev)
635 return dev->numa_node;
637 static inline void set_dev_node(struct device *dev, int node)
639 dev->numa_node = node;
642 static inline int dev_to_node(struct device *dev)
646 static inline void set_dev_node(struct device *dev, int node)
651 static inline struct pm_subsys_data *dev_to_psd(struct device *dev)
653 return dev ? dev->power.subsys_data : NULL;
656 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
658 return dev->kobj.uevent_suppress;
661 static inline void dev_set_uevent_suppress(struct device *dev, int val)
663 dev->kobj.uevent_suppress = val;
666 static inline int device_is_registered(struct device *dev)
668 return dev->kobj.state_in_sysfs;
671 static inline void device_enable_async_suspend(struct device *dev)
673 if (!dev->power.is_prepared)
674 dev->power.async_suspend = true;
677 static inline void device_disable_async_suspend(struct device *dev)
679 if (!dev->power.is_prepared)
680 dev->power.async_suspend = false;
683 static inline bool device_async_suspend_enabled(struct device *dev)
685 return !!dev->power.async_suspend;
688 static inline void device_lock(struct device *dev)
690 mutex_lock(&dev->mutex);
693 static inline int device_trylock(struct device *dev)
695 return mutex_trylock(&dev->mutex);
698 static inline void device_unlock(struct device *dev)
700 mutex_unlock(&dev->mutex);
703 void driver_init(void);
706 * High level routines for use by the bus drivers
708 extern int __must_check device_register(struct device *dev);
709 extern void device_unregister(struct device *dev);
710 extern void device_initialize(struct device *dev);
711 extern int __must_check device_add(struct device *dev);
712 extern void device_del(struct device *dev);
713 extern int device_for_each_child(struct device *dev, void *data,
714 int (*fn)(struct device *dev, void *data));
715 extern struct device *device_find_child(struct device *dev, void *data,
716 int (*match)(struct device *dev, void *data));
717 extern int device_rename(struct device *dev, const char *new_name);
718 extern int device_move(struct device *dev, struct device *new_parent,
719 enum dpm_order dpm_order);
720 extern const char *device_get_devnode(struct device *dev,
721 mode_t *mode, const char **tmp);
722 extern void *dev_get_drvdata(const struct device *dev);
723 extern int dev_set_drvdata(struct device *dev, void *data);
726 * Root device objects for grouping under /sys/devices
728 extern struct device *__root_device_register(const char *name,
729 struct module *owner);
732 * This is a macro to avoid include problems with THIS_MODULE,
733 * just as per what is done for device_schedule_callback() above.
735 #define root_device_register(name) \
736 __root_device_register(name, THIS_MODULE)
738 extern void root_device_unregister(struct device *root);
740 static inline void *dev_get_platdata(const struct device *dev)
742 return dev->platform_data;
746 * Manual binding of a device to driver. See drivers/base/bus.c
747 * for information on use.
749 extern int __must_check device_bind_driver(struct device *dev);
750 extern void device_release_driver(struct device *dev);
751 extern int __must_check device_attach(struct device *dev);
752 extern int __must_check driver_attach(struct device_driver *drv);
753 extern int __must_check device_reprobe(struct device *dev);
756 * Easy functions for dynamically creating devices on the fly
758 extern struct device *device_create_vargs(struct class *cls,
759 struct device *parent,
764 extern __printf(5, 6)
765 struct device *device_create(struct class *cls, struct device *parent,
766 dev_t devt, void *drvdata,
767 const char *fmt, ...);
768 extern void device_destroy(struct class *cls, dev_t devt);
771 * Platform "fixup" functions - allow the platform to have their say
772 * about devices and actions that the general device layer doesn't
775 /* Notify platform of device discovery */
776 extern int (*platform_notify)(struct device *dev);
778 extern int (*platform_notify_remove)(struct device *dev);
782 * get_device - atomically increment the reference count for the device.
785 extern struct device *get_device(struct device *dev);
786 extern void put_device(struct device *dev);
788 extern void wait_for_device_probe(void);
790 #ifdef CONFIG_DEVTMPFS
791 extern int devtmpfs_create_node(struct device *dev);
792 extern int devtmpfs_delete_node(struct device *dev);
793 extern int devtmpfs_mount(const char *mntdir);
795 static inline int devtmpfs_create_node(struct device *dev) { return 0; }
796 static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
797 static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
800 /* drivers/base/power/shutdown.c */
801 extern void device_shutdown(void);
803 /* debugging and troubleshooting/diagnostic helpers. */
804 extern const char *dev_driver_string(const struct device *dev);
809 extern int __dev_printk(const char *level, const struct device *dev,
810 struct va_format *vaf);
811 extern __printf(3, 4)
812 int dev_printk(const char *level, const struct device *dev,
813 const char *fmt, ...)
815 extern __printf(2, 3)
816 int dev_emerg(const struct device *dev, const char *fmt, ...);
817 extern __printf(2, 3)
818 int dev_alert(const struct device *dev, const char *fmt, ...);
819 extern __printf(2, 3)
820 int dev_crit(const struct device *dev, const char *fmt, ...);
821 extern __printf(2, 3)
822 int dev_err(const struct device *dev, const char *fmt, ...);
823 extern __printf(2, 3)
824 int dev_warn(const struct device *dev, const char *fmt, ...);
825 extern __printf(2, 3)
826 int dev_notice(const struct device *dev, const char *fmt, ...);
827 extern __printf(2, 3)
828 int _dev_info(const struct device *dev, const char *fmt, ...);
832 static inline int __dev_printk(const char *level, const struct device *dev,
833 struct va_format *vaf)
835 static inline __printf(3, 4)
836 int dev_printk(const char *level, const struct device *dev,
837 const char *fmt, ...)
840 static inline __printf(2, 3)
841 int dev_emerg(const struct device *dev, const char *fmt, ...)
843 static inline __printf(2, 3)
844 int dev_crit(const struct device *dev, const char *fmt, ...)
846 static inline __printf(2, 3)
847 int dev_alert(const struct device *dev, const char *fmt, ...)
849 static inline __printf(2, 3)
850 int dev_err(const struct device *dev, const char *fmt, ...)
852 static inline __printf(2, 3)
853 int dev_warn(const struct device *dev, const char *fmt, ...)
855 static inline __printf(2, 3)
856 int dev_notice(const struct device *dev, const char *fmt, ...)
858 static inline __printf(2, 3)
859 int _dev_info(const struct device *dev, const char *fmt, ...)
865 * Stupid hackaround for existing uses of non-printk uses dev_info
867 * Note that the definition of dev_info below is actually _dev_info
868 * and a macro is used to avoid redefining dev_info
871 #define dev_info(dev, fmt, arg...) _dev_info(dev, fmt, ##arg)
874 #define dev_dbg(dev, format, arg...) \
875 dev_printk(KERN_DEBUG, dev, format, ##arg)
876 #elif defined(CONFIG_DYNAMIC_DEBUG)
877 #define dev_dbg(dev, format, ...) \
879 dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
882 #define dev_dbg(dev, format, arg...) \
885 dev_printk(KERN_DEBUG, dev, format, ##arg); \
891 #define dev_vdbg dev_dbg
893 #define dev_vdbg(dev, format, arg...) \
896 dev_printk(KERN_DEBUG, dev, format, ##arg); \
902 * dev_WARN*() acts like dev_printk(), but with the key difference
903 * of using a WARN/WARN_ON to get the message out, including the
904 * file/line information and a backtrace.
906 #define dev_WARN(dev, format, arg...) \
907 WARN(1, "Device: %s\n" format, dev_driver_string(dev), ## arg);
909 #define dev_WARN_ONCE(dev, condition, format, arg...) \
910 WARN_ONCE(condition, "Device %s\n" format, \
911 dev_driver_string(dev), ## arg)
913 /* Create alias, so I can be autoloaded. */
914 #define MODULE_ALIAS_CHARDEV(major,minor) \
915 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
916 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
917 MODULE_ALIAS("char-major-" __stringify(major) "-*")
919 #ifdef CONFIG_SYSFS_DEPRECATED
920 extern long sysfs_deprecated;
922 #define sysfs_deprecated 0
926 * module_driver() - Helper macro for drivers that don't do anything
927 * special in module init/exit. This eliminates a lot of boilerplate.
928 * Each module may only use this macro once, and calling it replaces
929 * module_init() and module_exit().
931 * Use this macro to construct bus specific macros for registering
932 * drivers, and do not use it on its own.
934 #define module_driver(__driver, __register, __unregister) \
935 static int __init __driver##_init(void) \
937 return __register(&(__driver)); \
939 module_init(__driver##_init); \
940 static void __exit __driver##_exit(void) \
942 __unregister(&(__driver)); \
944 module_exit(__driver##_exit);
946 #endif /* _DEVICE_H_ */