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 lock 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 bool suppress_bind_attrs; /* disables bind/unbind via sysfs */
131 int (*probe) (struct device *dev);
132 int (*remove) (struct device *dev);
133 void (*shutdown) (struct device *dev);
134 int (*suspend) (struct device *dev, pm_message_t state);
135 int (*resume) (struct device *dev);
136 const struct attribute_group **groups;
138 const struct dev_pm_ops *pm;
140 struct driver_private *p;
144 extern int __must_check driver_register(struct device_driver *drv);
145 extern void driver_unregister(struct device_driver *drv);
147 extern struct device_driver *get_driver(struct device_driver *drv);
148 extern void put_driver(struct device_driver *drv);
149 extern struct device_driver *driver_find(const char *name,
150 struct bus_type *bus);
151 extern int driver_probe_done(void);
152 extern void wait_for_device_probe(void);
155 /* sysfs interface for exporting driver attributes */
157 struct driver_attribute {
158 struct attribute attr;
159 ssize_t (*show)(struct device_driver *driver, char *buf);
160 ssize_t (*store)(struct device_driver *driver, const char *buf,
164 #define DRIVER_ATTR(_name, _mode, _show, _store) \
165 struct driver_attribute driver_attr_##_name = \
166 __ATTR(_name, _mode, _show, _store)
168 extern int __must_check driver_create_file(struct device_driver *driver,
169 const struct driver_attribute *attr);
170 extern void driver_remove_file(struct device_driver *driver,
171 const struct driver_attribute *attr);
173 extern int __must_check driver_add_kobj(struct device_driver *drv,
174 struct kobject *kobj,
175 const char *fmt, ...);
177 extern int __must_check driver_for_each_device(struct device_driver *drv,
178 struct device *start,
180 int (*fn)(struct device *dev,
182 struct device *driver_find_device(struct device_driver *drv,
183 struct device *start, void *data,
184 int (*match)(struct device *dev, void *data));
191 struct module *owner;
193 struct class_attribute *class_attrs;
194 struct device_attribute *dev_attrs;
195 struct kobject *dev_kobj;
197 int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
198 char *(*devnode)(struct device *dev, mode_t *mode);
200 void (*class_release)(struct class *class);
201 void (*dev_release)(struct device *dev);
203 int (*suspend)(struct device *dev, pm_message_t state);
204 int (*resume)(struct device *dev);
206 const struct dev_pm_ops *pm;
208 struct class_private *p;
211 struct class_dev_iter {
212 struct klist_iter ki;
213 const struct device_type *type;
216 extern struct kobject *sysfs_dev_block_kobj;
217 extern struct kobject *sysfs_dev_char_kobj;
218 extern int __must_check __class_register(struct class *class,
219 struct lock_class_key *key);
220 extern void class_unregister(struct class *class);
222 /* This is a #define to keep the compiler from merging different
223 * instances of the __key variable */
224 #define class_register(class) \
226 static struct lock_class_key __key; \
227 __class_register(class, &__key); \
231 struct class_compat *class_compat_register(const char *name);
232 void class_compat_unregister(struct class_compat *cls);
233 int class_compat_create_link(struct class_compat *cls, struct device *dev,
234 struct device *device_link);
235 void class_compat_remove_link(struct class_compat *cls, struct device *dev,
236 struct device *device_link);
238 extern void class_dev_iter_init(struct class_dev_iter *iter,
240 struct device *start,
241 const struct device_type *type);
242 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
243 extern void class_dev_iter_exit(struct class_dev_iter *iter);
245 extern int class_for_each_device(struct class *class, struct device *start,
247 int (*fn)(struct device *dev, void *data));
248 extern struct device *class_find_device(struct class *class,
249 struct device *start, void *data,
250 int (*match)(struct device *, void *));
252 struct class_attribute {
253 struct attribute attr;
254 ssize_t (*show)(struct class *class, struct class_attribute *attr,
256 ssize_t (*store)(struct class *class, struct class_attribute *attr,
257 const char *buf, size_t count);
260 #define CLASS_ATTR(_name, _mode, _show, _store) \
261 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
263 extern int __must_check class_create_file(struct class *class,
264 const struct class_attribute *attr);
265 extern void class_remove_file(struct class *class,
266 const struct class_attribute *attr);
268 /* Simple class attribute that is just a static string */
270 struct class_attribute_string {
271 struct class_attribute attr;
275 /* Currently read-only only */
276 #define _CLASS_ATTR_STRING(_name, _mode, _str) \
277 { __ATTR(_name, _mode, show_class_attr_string, NULL), _str }
278 #define CLASS_ATTR_STRING(_name, _mode, _str) \
279 struct class_attribute_string class_attr_##_name = \
280 _CLASS_ATTR_STRING(_name, _mode, _str)
282 extern ssize_t show_class_attr_string(struct class *class, struct class_attribute *attr,
285 struct class_interface {
286 struct list_head node;
289 int (*add_dev) (struct device *, struct class_interface *);
290 void (*remove_dev) (struct device *, struct class_interface *);
293 extern int __must_check class_interface_register(struct class_interface *);
294 extern void class_interface_unregister(struct class_interface *);
296 extern struct class * __must_check __class_create(struct module *owner,
298 struct lock_class_key *key);
299 extern void class_destroy(struct class *cls);
301 /* This is a #define to keep the compiler from merging different
302 * instances of the __key variable */
303 #define class_create(owner, name) \
305 static struct lock_class_key __key; \
306 __class_create(owner, name, &__key); \
310 * The type of device, "struct device" is embedded in. A class
311 * or bus can contain devices of different types
312 * like "partitions" and "disks", "mouse" and "event".
313 * This identifies the device type and carries type-specific
314 * information, equivalent to the kobj_type of a kobject.
315 * If "name" is specified, the uevent will contain it in
316 * the DEVTYPE variable.
320 const struct attribute_group **groups;
321 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
322 char *(*devnode)(struct device *dev, mode_t *mode);
323 void (*release)(struct device *dev);
325 const struct dev_pm_ops *pm;
328 /* interface for exporting device attributes */
329 struct device_attribute {
330 struct attribute attr;
331 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
333 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
334 const char *buf, size_t count);
337 #define DEVICE_ATTR(_name, _mode, _show, _store) \
338 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
340 extern int __must_check device_create_file(struct device *device,
341 const struct device_attribute *entry);
342 extern void device_remove_file(struct device *dev,
343 const struct device_attribute *attr);
344 extern int __must_check device_create_bin_file(struct device *dev,
345 const struct bin_attribute *attr);
346 extern void device_remove_bin_file(struct device *dev,
347 const struct bin_attribute *attr);
348 extern int device_schedule_callback_owner(struct device *dev,
349 void (*func)(struct device *dev), struct module *owner);
351 /* This is a macro to avoid include problems with THIS_MODULE */
352 #define device_schedule_callback(dev, func) \
353 device_schedule_callback_owner(dev, func, THIS_MODULE)
355 /* device resource management */
356 typedef void (*dr_release_t)(struct device *dev, void *res);
357 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
359 #ifdef CONFIG_DEBUG_DEVRES
360 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
362 #define devres_alloc(release, size, gfp) \
363 __devres_alloc(release, size, gfp, #release)
365 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
367 extern void devres_free(void *res);
368 extern void devres_add(struct device *dev, void *res);
369 extern void *devres_find(struct device *dev, dr_release_t release,
370 dr_match_t match, void *match_data);
371 extern void *devres_get(struct device *dev, void *new_res,
372 dr_match_t match, void *match_data);
373 extern void *devres_remove(struct device *dev, dr_release_t release,
374 dr_match_t match, void *match_data);
375 extern int devres_destroy(struct device *dev, dr_release_t release,
376 dr_match_t match, void *match_data);
379 extern void * __must_check devres_open_group(struct device *dev, void *id,
381 extern void devres_close_group(struct device *dev, void *id);
382 extern void devres_remove_group(struct device *dev, void *id);
383 extern int devres_release_group(struct device *dev, void *id);
385 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
386 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
387 extern void devm_kfree(struct device *dev, void *p);
389 struct device_dma_parameters {
391 * a low level driver may set these to teach IOMMU code about
394 unsigned int max_segment_size;
395 unsigned long segment_boundary_mask;
399 struct device *parent;
401 struct device_private *p;
404 const char *init_name; /* initial name of the device */
405 struct device_type *type;
407 struct semaphore sem; /* semaphore to synchronize calls to
411 struct bus_type *bus; /* type of bus device is on */
412 struct device_driver *driver; /* which driver has allocated this
414 void *platform_data; /* Platform specific data, device
415 core doesn't touch it */
416 struct dev_pm_info power;
419 int numa_node; /* NUMA node this device is close to */
421 u64 *dma_mask; /* dma mask (if dma'able device) */
422 u64 coherent_dma_mask;/* Like dma_mask, but for
423 alloc_coherent mappings as
424 not all hardware supports
425 64 bit addresses for consistent
426 allocations such descriptors. */
428 struct device_dma_parameters *dma_parms;
430 struct list_head dma_pools; /* dma pools (if dma'ble) */
432 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
434 /* arch specific additions */
435 struct dev_archdata archdata;
437 dev_t devt; /* dev_t, creates the sysfs "dev" */
439 spinlock_t devres_lock;
440 struct list_head devres_head;
442 struct klist_node knode_class;
444 const struct attribute_group **groups; /* optional groups */
446 void (*release)(struct device *dev);
449 /* Get the wakeup routines, which depend on struct device */
450 #include <linux/pm_wakeup.h>
452 static inline const char *dev_name(const struct device *dev)
454 return kobject_name(&dev->kobj);
457 extern int dev_set_name(struct device *dev, const char *name, ...)
458 __attribute__((format(printf, 2, 3)));
461 static inline int dev_to_node(struct device *dev)
463 return dev->numa_node;
465 static inline void set_dev_node(struct device *dev, int node)
467 dev->numa_node = node;
470 static inline int dev_to_node(struct device *dev)
474 static inline void set_dev_node(struct device *dev, int node)
479 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
481 return dev->kobj.uevent_suppress;
484 static inline void dev_set_uevent_suppress(struct device *dev, int val)
486 dev->kobj.uevent_suppress = val;
489 static inline int device_is_registered(struct device *dev)
491 return dev->kobj.state_in_sysfs;
494 static inline void device_enable_async_suspend(struct device *dev)
496 if (dev->power.status == DPM_ON)
497 dev->power.async_suspend = true;
500 static inline void device_disable_async_suspend(struct device *dev)
502 if (dev->power.status == DPM_ON)
503 dev->power.async_suspend = false;
506 static inline bool device_async_suspend_enabled(struct device *dev)
508 return !!dev->power.async_suspend;
511 static inline void device_lock(struct device *dev)
516 static inline int device_trylock(struct device *dev)
518 return down_trylock(&dev->sem);
521 static inline void device_unlock(struct device *dev)
526 void driver_init(void);
529 * High level routines for use by the bus drivers
531 extern int __must_check device_register(struct device *dev);
532 extern void device_unregister(struct device *dev);
533 extern void device_initialize(struct device *dev);
534 extern int __must_check device_add(struct device *dev);
535 extern void device_del(struct device *dev);
536 extern int device_for_each_child(struct device *dev, void *data,
537 int (*fn)(struct device *dev, void *data));
538 extern struct device *device_find_child(struct device *dev, void *data,
539 int (*match)(struct device *dev, void *data));
540 extern int device_rename(struct device *dev, char *new_name);
541 extern int device_move(struct device *dev, struct device *new_parent,
542 enum dpm_order dpm_order);
543 extern const char *device_get_devnode(struct device *dev,
544 mode_t *mode, const char **tmp);
545 extern void *dev_get_drvdata(const struct device *dev);
546 extern void dev_set_drvdata(struct device *dev, void *data);
549 * Root device objects for grouping under /sys/devices
551 extern struct device *__root_device_register(const char *name,
552 struct module *owner);
553 static inline struct device *root_device_register(const char *name)
555 return __root_device_register(name, THIS_MODULE);
557 extern void root_device_unregister(struct device *root);
559 static inline void *dev_get_platdata(const struct device *dev)
561 return dev->platform_data;
565 * Manual binding of a device to driver. See drivers/base/bus.c
566 * for information on use.
568 extern int __must_check device_bind_driver(struct device *dev);
569 extern void device_release_driver(struct device *dev);
570 extern int __must_check device_attach(struct device *dev);
571 extern int __must_check driver_attach(struct device_driver *drv);
572 extern int __must_check device_reprobe(struct device *dev);
575 * Easy functions for dynamically creating devices on the fly
577 extern struct device *device_create_vargs(struct class *cls,
578 struct device *parent,
583 extern struct device *device_create(struct class *cls, struct device *parent,
584 dev_t devt, void *drvdata,
585 const char *fmt, ...)
586 __attribute__((format(printf, 5, 6)));
587 extern void device_destroy(struct class *cls, dev_t devt);
590 * Platform "fixup" functions - allow the platform to have their say
591 * about devices and actions that the general device layer doesn't
594 /* Notify platform of device discovery */
595 extern int (*platform_notify)(struct device *dev);
597 extern int (*platform_notify_remove)(struct device *dev);
601 * get_device - atomically increment the reference count for the device.
604 extern struct device *get_device(struct device *dev);
605 extern void put_device(struct device *dev);
607 extern void wait_for_device_probe(void);
609 #ifdef CONFIG_DEVTMPFS
610 extern int devtmpfs_create_node(struct device *dev);
611 extern int devtmpfs_delete_node(struct device *dev);
612 extern int devtmpfs_mount(const char *mntdir);
614 static inline int devtmpfs_create_node(struct device *dev) { return 0; }
615 static inline int devtmpfs_delete_node(struct device *dev) { return 0; }
616 static inline int devtmpfs_mount(const char *mountpoint) { return 0; }
619 /* drivers/base/power/shutdown.c */
620 extern void device_shutdown(void);
622 /* drivers/base/sys.c */
623 extern void sysdev_shutdown(void);
625 /* debugging and troubleshooting/diagnostic helpers. */
626 extern const char *dev_driver_string(const struct device *dev);
627 #define dev_printk(level, dev, format, arg...) \
628 printk(level "%s %s: " format , dev_driver_string(dev) , \
629 dev_name(dev) , ## arg)
631 #define dev_emerg(dev, format, arg...) \
632 dev_printk(KERN_EMERG , dev , format , ## arg)
633 #define dev_alert(dev, format, arg...) \
634 dev_printk(KERN_ALERT , dev , format , ## arg)
635 #define dev_crit(dev, format, arg...) \
636 dev_printk(KERN_CRIT , dev , format , ## arg)
637 #define dev_err(dev, format, arg...) \
638 dev_printk(KERN_ERR , dev , format , ## arg)
639 #define dev_warn(dev, format, arg...) \
640 dev_printk(KERN_WARNING , dev , format , ## arg)
641 #define dev_notice(dev, format, arg...) \
642 dev_printk(KERN_NOTICE , dev , format , ## arg)
643 #define dev_info(dev, format, arg...) \
644 dev_printk(KERN_INFO , dev , format , ## arg)
647 #define dev_dbg(dev, format, arg...) \
648 dev_printk(KERN_DEBUG , dev , format , ## arg)
649 #elif defined(CONFIG_DYNAMIC_DEBUG)
650 #define dev_dbg(dev, format, ...) do { \
651 dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
654 #define dev_dbg(dev, format, arg...) \
655 ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
659 #define dev_vdbg dev_dbg
662 #define dev_vdbg(dev, format, arg...) \
663 ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
667 * dev_WARN() acts like dev_printk(), but with the key difference
668 * of using a WARN/WARN_ON to get the message out, including the
669 * file/line information and a backtrace.
671 #define dev_WARN(dev, format, arg...) \
672 WARN(1, "Device: %s\n" format, dev_driver_string(dev), ## arg);
674 /* Create alias, so I can be autoloaded. */
675 #define MODULE_ALIAS_CHARDEV(major,minor) \
676 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
677 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
678 MODULE_ALIAS("char-major-" __stringify(major) "-*")
679 #endif /* _DEVICE_H_ */