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/module.h>
25 #include <linux/semaphore.h>
26 #include <asm/atomic.h>
27 #include <asm/device.h>
30 struct device_private;
32 struct driver_private;
36 struct bus_type_private;
38 struct bus_attribute {
39 struct attribute attr;
40 ssize_t (*show)(struct bus_type *bus, char *buf);
41 ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
44 #define BUS_ATTR(_name, _mode, _show, _store) \
45 struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
47 extern int __must_check bus_create_file(struct bus_type *,
48 struct bus_attribute *);
49 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
53 struct bus_attribute *bus_attrs;
54 struct device_attribute *dev_attrs;
55 struct driver_attribute *drv_attrs;
57 int (*match)(struct device *dev, struct device_driver *drv);
58 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
59 int (*probe)(struct device *dev);
60 int (*remove)(struct device *dev);
61 void (*shutdown)(struct device *dev);
63 int (*suspend)(struct device *dev, pm_message_t state);
64 int (*resume)(struct device *dev);
66 const struct dev_pm_ops *pm;
68 struct bus_type_private *p;
71 extern int __must_check bus_register(struct bus_type *bus);
72 extern void bus_unregister(struct bus_type *bus);
74 extern int __must_check bus_rescan_devices(struct bus_type *bus);
76 /* iterator helpers for buses */
78 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
79 int (*fn)(struct device *dev, void *data));
80 struct device *bus_find_device(struct bus_type *bus, struct device *start,
82 int (*match)(struct device *dev, void *data));
83 struct device *bus_find_device_by_name(struct bus_type *bus,
87 int __must_check bus_for_each_drv(struct bus_type *bus,
88 struct device_driver *start, void *data,
89 int (*fn)(struct device_driver *, void *));
91 void bus_sort_breadthfirst(struct bus_type *bus,
92 int (*compare)(const struct device *a,
93 const struct device *b));
95 * Bus notifiers: Get notified of addition/removal of devices
96 * and binding/unbinding of drivers to devices.
97 * In the long run, it should be a replacement for the platform
100 struct notifier_block;
102 extern int bus_register_notifier(struct bus_type *bus,
103 struct notifier_block *nb);
104 extern int bus_unregister_notifier(struct bus_type *bus,
105 struct notifier_block *nb);
107 /* All 4 notifers below get called with the target struct device *
108 * as an argument. Note that those functions are likely to be called
109 * with the device semaphore held in the core, so be careful.
111 #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
112 #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device removed */
113 #define BUS_NOTIFY_BOUND_DRIVER 0x00000003 /* driver bound to device */
114 #define BUS_NOTIFY_UNBIND_DRIVER 0x00000004 /* driver about to be
116 #define BUS_NOTIFY_UNBOUND_DRIVER 0x00000005 /* driver is unbound
119 extern struct kset *bus_get_kset(struct bus_type *bus);
120 extern struct klist *bus_get_device_klist(struct bus_type *bus);
122 struct device_driver {
124 struct bus_type *bus;
126 struct module *owner;
127 const char *mod_name; /* used for built-in modules */
129 int (*probe) (struct device *dev);
130 int (*remove) (struct device *dev);
131 void (*shutdown) (struct device *dev);
132 int (*suspend) (struct device *dev, pm_message_t state);
133 int (*resume) (struct device *dev);
134 const struct attribute_group **groups;
136 const struct dev_pm_ops *pm;
138 struct driver_private *p;
142 extern int __must_check driver_register(struct device_driver *drv);
143 extern void driver_unregister(struct device_driver *drv);
145 extern struct device_driver *get_driver(struct device_driver *drv);
146 extern void put_driver(struct device_driver *drv);
147 extern struct device_driver *driver_find(const char *name,
148 struct bus_type *bus);
149 extern int driver_probe_done(void);
150 extern void wait_for_device_probe(void);
153 /* sysfs interface for exporting driver attributes */
155 struct driver_attribute {
156 struct attribute attr;
157 ssize_t (*show)(struct device_driver *driver, char *buf);
158 ssize_t (*store)(struct device_driver *driver, const char *buf,
162 #define DRIVER_ATTR(_name, _mode, _show, _store) \
163 struct driver_attribute driver_attr_##_name = \
164 __ATTR(_name, _mode, _show, _store)
166 extern int __must_check driver_create_file(struct device_driver *driver,
167 struct driver_attribute *attr);
168 extern void driver_remove_file(struct device_driver *driver,
169 struct driver_attribute *attr);
171 extern int __must_check driver_add_kobj(struct device_driver *drv,
172 struct kobject *kobj,
173 const char *fmt, ...);
175 extern int __must_check driver_for_each_device(struct device_driver *drv,
176 struct device *start,
178 int (*fn)(struct device *dev,
180 struct device *driver_find_device(struct device_driver *drv,
181 struct device *start, void *data,
182 int (*match)(struct device *dev, void *data));
189 struct module *owner;
191 struct class_attribute *class_attrs;
192 struct device_attribute *dev_attrs;
193 struct kobject *dev_kobj;
195 int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
196 char *(*nodename)(struct device *dev);
198 void (*class_release)(struct class *class);
199 void (*dev_release)(struct device *dev);
201 int (*suspend)(struct device *dev, pm_message_t state);
202 int (*resume)(struct device *dev);
204 const struct dev_pm_ops *pm;
206 struct class_private *p;
209 struct class_dev_iter {
210 struct klist_iter ki;
211 const struct device_type *type;
214 extern struct kobject *sysfs_dev_block_kobj;
215 extern struct kobject *sysfs_dev_char_kobj;
216 extern int __must_check __class_register(struct class *class,
217 struct lock_class_key *key);
218 extern void class_unregister(struct class *class);
220 /* This is a #define to keep the compiler from merging different
221 * instances of the __key variable */
222 #define class_register(class) \
224 static struct lock_class_key __key; \
225 __class_register(class, &__key); \
228 extern void class_dev_iter_init(struct class_dev_iter *iter,
230 struct device *start,
231 const struct device_type *type);
232 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
233 extern void class_dev_iter_exit(struct class_dev_iter *iter);
235 extern int class_for_each_device(struct class *class, struct device *start,
237 int (*fn)(struct device *dev, void *data));
238 extern struct device *class_find_device(struct class *class,
239 struct device *start, void *data,
240 int (*match)(struct device *, void *));
242 struct class_attribute {
243 struct attribute attr;
244 ssize_t (*show)(struct class *class, char *buf);
245 ssize_t (*store)(struct class *class, const char *buf, size_t count);
248 #define CLASS_ATTR(_name, _mode, _show, _store) \
249 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
251 extern int __must_check class_create_file(struct class *class,
252 const struct class_attribute *attr);
253 extern void class_remove_file(struct class *class,
254 const struct class_attribute *attr);
256 struct class_interface {
257 struct list_head node;
260 int (*add_dev) (struct device *, struct class_interface *);
261 void (*remove_dev) (struct device *, struct class_interface *);
264 extern int __must_check class_interface_register(struct class_interface *);
265 extern void class_interface_unregister(struct class_interface *);
267 extern struct class * __must_check __class_create(struct module *owner,
269 struct lock_class_key *key);
270 extern void class_destroy(struct class *cls);
272 /* This is a #define to keep the compiler from merging different
273 * instances of the __key variable */
274 #define class_create(owner, name) \
276 static struct lock_class_key __key; \
277 __class_create(owner, name, &__key); \
281 * The type of device, "struct device" is embedded in. A class
282 * or bus can contain devices of different types
283 * like "partitions" and "disks", "mouse" and "event".
284 * This identifies the device type and carries type-specific
285 * information, equivalent to the kobj_type of a kobject.
286 * If "name" is specified, the uevent will contain it in
287 * the DEVTYPE variable.
291 const struct attribute_group **groups;
292 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
293 char *(*nodename)(struct device *dev);
294 void (*release)(struct device *dev);
296 const struct dev_pm_ops *pm;
299 /* interface for exporting device attributes */
300 struct device_attribute {
301 struct attribute attr;
302 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
304 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
305 const char *buf, size_t count);
308 #define DEVICE_ATTR(_name, _mode, _show, _store) \
309 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
311 extern int __must_check device_create_file(struct device *device,
312 struct device_attribute *entry);
313 extern void device_remove_file(struct device *dev,
314 struct device_attribute *attr);
315 extern int __must_check device_create_bin_file(struct device *dev,
316 struct bin_attribute *attr);
317 extern void device_remove_bin_file(struct device *dev,
318 struct bin_attribute *attr);
319 extern int device_schedule_callback_owner(struct device *dev,
320 void (*func)(struct device *dev), struct module *owner);
322 /* This is a macro to avoid include problems with THIS_MODULE */
323 #define device_schedule_callback(dev, func) \
324 device_schedule_callback_owner(dev, func, THIS_MODULE)
326 /* device resource management */
327 typedef void (*dr_release_t)(struct device *dev, void *res);
328 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
330 #ifdef CONFIG_DEBUG_DEVRES
331 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
333 #define devres_alloc(release, size, gfp) \
334 __devres_alloc(release, size, gfp, #release)
336 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
338 extern void devres_free(void *res);
339 extern void devres_add(struct device *dev, void *res);
340 extern void *devres_find(struct device *dev, dr_release_t release,
341 dr_match_t match, void *match_data);
342 extern void *devres_get(struct device *dev, void *new_res,
343 dr_match_t match, void *match_data);
344 extern void *devres_remove(struct device *dev, dr_release_t release,
345 dr_match_t match, void *match_data);
346 extern int devres_destroy(struct device *dev, dr_release_t release,
347 dr_match_t match, void *match_data);
350 extern void * __must_check devres_open_group(struct device *dev, void *id,
352 extern void devres_close_group(struct device *dev, void *id);
353 extern void devres_remove_group(struct device *dev, void *id);
354 extern int devres_release_group(struct device *dev, void *id);
356 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
357 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
358 extern void devm_kfree(struct device *dev, void *p);
360 struct device_dma_parameters {
362 * a low level driver may set these to teach IOMMU code about
365 unsigned int max_segment_size;
366 unsigned long segment_boundary_mask;
370 struct device *parent;
372 struct device_private *p;
375 const char *init_name; /* initial name of the device */
376 struct device_type *type;
378 struct semaphore sem; /* semaphore to synchronize calls to
382 struct bus_type *bus; /* type of bus device is on */
383 struct device_driver *driver; /* which driver has allocated this
385 void *platform_data; /* Platform specific data, device
386 core doesn't touch it */
387 struct dev_pm_info power;
390 int numa_node; /* NUMA node this device is close to */
392 u64 *dma_mask; /* dma mask (if dma'able device) */
393 u64 coherent_dma_mask;/* Like dma_mask, but for
394 alloc_coherent mappings as
395 not all hardware supports
396 64 bit addresses for consistent
397 allocations such descriptors. */
399 struct device_dma_parameters *dma_parms;
401 struct list_head dma_pools; /* dma pools (if dma'ble) */
403 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
405 /* arch specific additions */
406 struct dev_archdata archdata;
408 dev_t devt; /* dev_t, creates the sysfs "dev" */
410 spinlock_t devres_lock;
411 struct list_head devres_head;
413 struct klist_node knode_class;
415 const struct attribute_group **groups; /* optional groups */
417 void (*release)(struct device *dev);
420 /* Get the wakeup routines, which depend on struct device */
421 #include <linux/pm_wakeup.h>
423 static inline const char *dev_name(const struct device *dev)
425 return kobject_name(&dev->kobj);
428 extern int dev_set_name(struct device *dev, const char *name, ...)
429 __attribute__((format(printf, 2, 3)));
432 static inline int dev_to_node(struct device *dev)
434 return dev->numa_node;
436 static inline void set_dev_node(struct device *dev, int node)
438 dev->numa_node = node;
441 static inline int dev_to_node(struct device *dev)
445 static inline void set_dev_node(struct device *dev, int node)
450 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
452 return dev->kobj.uevent_suppress;
455 static inline void dev_set_uevent_suppress(struct device *dev, int val)
457 dev->kobj.uevent_suppress = val;
460 static inline int device_is_registered(struct device *dev)
462 return dev->kobj.state_in_sysfs;
465 void driver_init(void);
468 * High level routines for use by the bus drivers
470 extern int __must_check device_register(struct device *dev);
471 extern void device_unregister(struct device *dev);
472 extern void device_initialize(struct device *dev);
473 extern int __must_check device_add(struct device *dev);
474 extern void device_del(struct device *dev);
475 extern int device_for_each_child(struct device *dev, void *data,
476 int (*fn)(struct device *dev, void *data));
477 extern struct device *device_find_child(struct device *dev, void *data,
478 int (*match)(struct device *dev, void *data));
479 extern int device_rename(struct device *dev, char *new_name);
480 extern int device_move(struct device *dev, struct device *new_parent,
481 enum dpm_order dpm_order);
482 extern const char *device_get_nodename(struct device *dev, const char **tmp);
483 extern void *dev_get_drvdata(const struct device *dev);
484 extern void dev_set_drvdata(struct device *dev, void *data);
487 * Root device objects for grouping under /sys/devices
489 extern struct device *__root_device_register(const char *name,
490 struct module *owner);
491 static inline struct device *root_device_register(const char *name)
493 return __root_device_register(name, THIS_MODULE);
495 extern void root_device_unregister(struct device *root);
497 static inline void *dev_get_platdata(const struct device *dev)
499 return dev->platform_data;
503 * Manual binding of a device to driver. See drivers/base/bus.c
504 * for information on use.
506 extern int __must_check device_bind_driver(struct device *dev);
507 extern void device_release_driver(struct device *dev);
508 extern int __must_check device_attach(struct device *dev);
509 extern int __must_check driver_attach(struct device_driver *drv);
510 extern int __must_check device_reprobe(struct device *dev);
513 * Easy functions for dynamically creating devices on the fly
515 extern struct device *device_create_vargs(struct class *cls,
516 struct device *parent,
521 extern struct device *device_create(struct class *cls, struct device *parent,
522 dev_t devt, void *drvdata,
523 const char *fmt, ...)
524 __attribute__((format(printf, 5, 6)));
525 extern void device_destroy(struct class *cls, dev_t devt);
528 * Platform "fixup" functions - allow the platform to have their say
529 * about devices and actions that the general device layer doesn't
532 /* Notify platform of device discovery */
533 extern int (*platform_notify)(struct device *dev);
535 extern int (*platform_notify_remove)(struct device *dev);
539 * get_device - atomically increment the reference count for the device.
542 extern struct device *get_device(struct device *dev);
543 extern void put_device(struct device *dev);
545 extern void wait_for_device_probe(void);
547 /* drivers/base/power/shutdown.c */
548 extern void device_shutdown(void);
550 /* drivers/base/sys.c */
551 extern void sysdev_shutdown(void);
553 /* debugging and troubleshooting/diagnostic helpers. */
554 extern const char *dev_driver_string(const struct device *dev);
555 #define dev_printk(level, dev, format, arg...) \
556 printk(level "%s %s: " format , dev_driver_string(dev) , \
557 dev_name(dev) , ## arg)
559 #define dev_emerg(dev, format, arg...) \
560 dev_printk(KERN_EMERG , dev , format , ## arg)
561 #define dev_alert(dev, format, arg...) \
562 dev_printk(KERN_ALERT , dev , format , ## arg)
563 #define dev_crit(dev, format, arg...) \
564 dev_printk(KERN_CRIT , dev , format , ## arg)
565 #define dev_err(dev, format, arg...) \
566 dev_printk(KERN_ERR , dev , format , ## arg)
567 #define dev_warn(dev, format, arg...) \
568 dev_printk(KERN_WARNING , dev , format , ## arg)
569 #define dev_notice(dev, format, arg...) \
570 dev_printk(KERN_NOTICE , dev , format , ## arg)
571 #define dev_info(dev, format, arg...) \
572 dev_printk(KERN_INFO , dev , format , ## arg)
575 #define dev_dbg(dev, format, arg...) \
576 dev_printk(KERN_DEBUG , dev , format , ## arg)
577 #elif defined(CONFIG_DYNAMIC_DEBUG)
578 #define dev_dbg(dev, format, ...) do { \
579 dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
582 #define dev_dbg(dev, format, arg...) \
583 ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
587 #define dev_vdbg dev_dbg
590 #define dev_vdbg(dev, format, arg...) \
591 ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
595 * dev_WARN() acts like dev_printk(), but with the key difference
596 * of using a WARN/WARN_ON to get the message out, including the
597 * file/line information and a backtrace.
599 #define dev_WARN(dev, format, arg...) \
600 WARN(1, "Device: %s\n" format, dev_driver_string(dev), ## arg);
602 /* Create alias, so I can be autoloaded. */
603 #define MODULE_ALIAS_CHARDEV(major,minor) \
604 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
605 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
606 MODULE_ALIAS("char-major-" __stringify(major) "-*")
607 #endif /* _DEVICE_H_ */