2 * device.h - generic, centralized driver model
4 * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
5 * Copyright (c) 2004-2007 Greg Kroah-Hartman <gregkh@suse.de>
7 * This file is released under the GPLv2
9 * See Documentation/driver-model/ for more information.
15 #include <linux/ioport.h>
16 #include <linux/kobject.h>
17 #include <linux/klist.h>
18 #include <linux/list.h>
19 #include <linux/lockdep.h>
20 #include <linux/compiler.h>
21 #include <linux/types.h>
22 #include <linux/module.h>
24 #include <linux/semaphore.h>
25 #include <asm/atomic.h>
26 #include <asm/device.h>
28 #define BUS_ID_SIZE 20
31 struct device_private;
33 struct driver_private;
37 struct bus_type_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 *);
54 struct bus_attribute *bus_attrs;
55 struct device_attribute *dev_attrs;
56 struct driver_attribute *drv_attrs;
58 int (*match)(struct device *dev, struct device_driver *drv);
59 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
60 int (*probe)(struct device *dev);
61 int (*remove)(struct device *dev);
62 void (*shutdown)(struct device *dev);
64 int (*suspend)(struct device *dev, pm_message_t state);
65 int (*resume)(struct device *dev);
67 struct dev_pm_ops *pm;
69 struct bus_type_private *p;
72 extern int __must_check bus_register(struct bus_type *bus);
73 extern void bus_unregister(struct bus_type *bus);
75 extern int __must_check bus_rescan_devices(struct bus_type *bus);
77 /* iterator helpers for buses */
79 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
80 int (*fn)(struct device *dev, void *data));
81 struct device *bus_find_device(struct bus_type *bus, struct device *start,
83 int (*match)(struct device *dev, void *data));
84 struct device *bus_find_device_by_name(struct bus_type *bus,
88 int __must_check bus_for_each_drv(struct bus_type *bus,
89 struct device_driver *start, void *data,
90 int (*fn)(struct device_driver *, void *));
92 void bus_sort_breadthfirst(struct bus_type *bus,
93 int (*compare)(const struct device *a,
94 const struct device *b));
96 * Bus notifiers: Get notified of addition/removal of devices
97 * and binding/unbinding of drivers to devices.
98 * In the long run, it should be a replacement for the platform
101 struct notifier_block;
103 extern int bus_register_notifier(struct bus_type *bus,
104 struct notifier_block *nb);
105 extern int bus_unregister_notifier(struct bus_type *bus,
106 struct notifier_block *nb);
108 /* All 4 notifers below get called with the target struct device *
109 * as an argument. Note that those functions are likely to be called
110 * with the device semaphore held in the core, so be careful.
112 #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
113 #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device removed */
114 #define BUS_NOTIFY_BOUND_DRIVER 0x00000003 /* driver bound to device */
115 #define BUS_NOTIFY_UNBIND_DRIVER 0x00000004 /* driver about to be
118 extern struct kset *bus_get_kset(struct bus_type *bus);
119 extern struct klist *bus_get_device_klist(struct bus_type *bus);
121 struct device_driver {
123 struct bus_type *bus;
125 struct module *owner;
126 const char *mod_name; /* used for built-in modules */
128 int (*probe) (struct device *dev);
129 int (*remove) (struct device *dev);
130 void (*shutdown) (struct device *dev);
131 int (*suspend) (struct device *dev, pm_message_t state);
132 int (*resume) (struct device *dev);
133 struct attribute_group **groups;
135 struct dev_pm_ops *pm;
137 struct driver_private *p;
141 extern int __must_check driver_register(struct device_driver *drv);
142 extern void driver_unregister(struct device_driver *drv);
144 extern struct device_driver *get_driver(struct device_driver *drv);
145 extern void put_driver(struct device_driver *drv);
146 extern struct device_driver *driver_find(const char *name,
147 struct bus_type *bus);
148 extern int driver_probe_done(void);
149 extern void wait_for_device_probe(void);
152 /* sysfs interface for exporting driver attributes */
154 struct driver_attribute {
155 struct attribute attr;
156 ssize_t (*show)(struct device_driver *driver, char *buf);
157 ssize_t (*store)(struct device_driver *driver, const char *buf,
161 #define DRIVER_ATTR(_name, _mode, _show, _store) \
162 struct driver_attribute driver_attr_##_name = \
163 __ATTR(_name, _mode, _show, _store)
165 extern int __must_check driver_create_file(struct device_driver *driver,
166 struct driver_attribute *attr);
167 extern void driver_remove_file(struct device_driver *driver,
168 struct driver_attribute *attr);
170 extern int __must_check driver_add_kobj(struct device_driver *drv,
171 struct kobject *kobj,
172 const char *fmt, ...);
174 extern int __must_check driver_for_each_device(struct device_driver *drv,
175 struct device *start,
177 int (*fn)(struct device *dev,
179 struct device *driver_find_device(struct device_driver *drv,
180 struct device *start, void *data,
181 int (*match)(struct device *dev, void *data));
188 struct module *owner;
190 struct class_attribute *class_attrs;
191 struct device_attribute *dev_attrs;
192 struct kobject *dev_kobj;
194 int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
196 void (*class_release)(struct class *class);
197 void (*dev_release)(struct device *dev);
199 int (*suspend)(struct device *dev, pm_message_t state);
200 int (*resume)(struct device *dev);
202 struct dev_pm_ops *pm;
203 struct class_private *p;
206 struct class_dev_iter {
207 struct klist_iter ki;
208 const struct device_type *type;
211 extern struct kobject *sysfs_dev_block_kobj;
212 extern struct kobject *sysfs_dev_char_kobj;
213 extern int __must_check __class_register(struct class *class,
214 struct lock_class_key *key);
215 extern void class_unregister(struct class *class);
217 /* This is a #define to keep the compiler from merging different
218 * instances of the __key variable */
219 #define class_register(class) \
221 static struct lock_class_key __key; \
222 __class_register(class, &__key); \
225 extern void class_dev_iter_init(struct class_dev_iter *iter,
227 struct device *start,
228 const struct device_type *type);
229 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
230 extern void class_dev_iter_exit(struct class_dev_iter *iter);
232 extern int class_for_each_device(struct class *class, struct device *start,
234 int (*fn)(struct device *dev, void *data));
235 extern struct device *class_find_device(struct class *class,
236 struct device *start, void *data,
237 int (*match)(struct device *, void *));
239 struct class_attribute {
240 struct attribute attr;
241 ssize_t (*show)(struct class *class, char *buf);
242 ssize_t (*store)(struct class *class, const char *buf, size_t count);
245 #define CLASS_ATTR(_name, _mode, _show, _store) \
246 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
248 extern int __must_check class_create_file(struct class *class,
249 const struct class_attribute *attr);
250 extern void class_remove_file(struct class *class,
251 const struct class_attribute *attr);
253 struct class_interface {
254 struct list_head node;
257 int (*add_dev) (struct device *, struct class_interface *);
258 void (*remove_dev) (struct device *, struct class_interface *);
261 extern int __must_check class_interface_register(struct class_interface *);
262 extern void class_interface_unregister(struct class_interface *);
264 extern struct class * __must_check __class_create(struct module *owner,
266 struct lock_class_key *key);
267 extern void class_destroy(struct class *cls);
269 /* This is a #define to keep the compiler from merging different
270 * instances of the __key variable */
271 #define class_create(owner, name) \
273 static struct lock_class_key __key; \
274 __class_create(owner, name, &__key); \
278 * The type of device, "struct device" is embedded in. A class
279 * or bus can contain devices of different types
280 * like "partitions" and "disks", "mouse" and "event".
281 * This identifies the device type and carries type-specific
282 * information, equivalent to the kobj_type of a kobject.
283 * If "name" is specified, the uevent will contain it in
284 * the DEVTYPE variable.
288 struct attribute_group **groups;
289 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
290 void (*release)(struct device *dev);
292 struct dev_pm_ops *pm;
295 /* interface for exporting device attributes */
296 struct device_attribute {
297 struct attribute attr;
298 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
300 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
301 const char *buf, size_t count);
304 #define DEVICE_ATTR(_name, _mode, _show, _store) \
305 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
307 extern int __must_check device_create_file(struct device *device,
308 struct device_attribute *entry);
309 extern void device_remove_file(struct device *dev,
310 struct device_attribute *attr);
311 extern int __must_check device_create_bin_file(struct device *dev,
312 struct bin_attribute *attr);
313 extern void device_remove_bin_file(struct device *dev,
314 struct bin_attribute *attr);
315 extern int device_schedule_callback_owner(struct device *dev,
316 void (*func)(struct device *dev), struct module *owner);
318 /* This is a macro to avoid include problems with THIS_MODULE */
319 #define device_schedule_callback(dev, func) \
320 device_schedule_callback_owner(dev, func, THIS_MODULE)
322 /* device resource management */
323 typedef void (*dr_release_t)(struct device *dev, void *res);
324 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
326 #ifdef CONFIG_DEBUG_DEVRES
327 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
329 #define devres_alloc(release, size, gfp) \
330 __devres_alloc(release, size, gfp, #release)
332 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
334 extern void devres_free(void *res);
335 extern void devres_add(struct device *dev, void *res);
336 extern void *devres_find(struct device *dev, dr_release_t release,
337 dr_match_t match, void *match_data);
338 extern void *devres_get(struct device *dev, void *new_res,
339 dr_match_t match, void *match_data);
340 extern void *devres_remove(struct device *dev, dr_release_t release,
341 dr_match_t match, void *match_data);
342 extern int devres_destroy(struct device *dev, dr_release_t release,
343 dr_match_t match, void *match_data);
346 extern void * __must_check devres_open_group(struct device *dev, void *id,
348 extern void devres_close_group(struct device *dev, void *id);
349 extern void devres_remove_group(struct device *dev, void *id);
350 extern int devres_release_group(struct device *dev, void *id);
352 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
353 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
354 extern void devm_kfree(struct device *dev, void *p);
356 struct device_dma_parameters {
358 * a low level driver may set these to teach IOMMU code about
361 unsigned int max_segment_size;
362 unsigned long segment_boundary_mask;
366 struct device *parent;
368 struct device_private *p;
371 const char *init_name; /* initial name of the device */
372 struct device_type *type;
374 struct semaphore sem; /* semaphore to synchronize calls to
378 struct bus_type *bus; /* type of bus device is on */
379 struct device_driver *driver; /* which driver has allocated this
381 void *driver_data; /* data private to the driver */
382 void *platform_data; /* Platform specific data, device
383 core doesn't touch it */
384 struct dev_pm_info power;
387 int numa_node; /* NUMA node this device is close to */
389 u64 *dma_mask; /* dma mask (if dma'able device) */
390 u64 coherent_dma_mask;/* Like dma_mask, but for
391 alloc_coherent mappings as
392 not all hardware supports
393 64 bit addresses for consistent
394 allocations such descriptors. */
396 struct device_dma_parameters *dma_parms;
398 struct list_head dma_pools; /* dma pools (if dma'ble) */
400 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
402 /* arch specific additions */
403 struct dev_archdata archdata;
405 dev_t devt; /* dev_t, creates the sysfs "dev" */
407 spinlock_t devres_lock;
408 struct list_head devres_head;
410 struct klist_node knode_class;
412 struct attribute_group **groups; /* optional groups */
414 void (*release)(struct device *dev);
417 /* Get the wakeup routines, which depend on struct device */
418 #include <linux/pm_wakeup.h>
420 static inline const char *dev_name(const struct device *dev)
422 return kobject_name(&dev->kobj);
425 extern int dev_set_name(struct device *dev, const char *name, ...)
426 __attribute__((format(printf, 2, 3)));
429 static inline int dev_to_node(struct device *dev)
431 return dev->numa_node;
433 static inline void set_dev_node(struct device *dev, int node)
435 dev->numa_node = node;
438 static inline int dev_to_node(struct device *dev)
442 static inline void set_dev_node(struct device *dev, int node)
447 static inline void *dev_get_drvdata(const struct device *dev)
449 return dev->driver_data;
452 static inline void dev_set_drvdata(struct device *dev, void *data)
454 dev->driver_data = data;
457 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
459 return dev->kobj.uevent_suppress;
462 static inline void dev_set_uevent_suppress(struct device *dev, int val)
464 dev->kobj.uevent_suppress = val;
467 static inline int device_is_registered(struct device *dev)
469 return dev->kobj.state_in_sysfs;
472 void driver_init(void);
475 * High level routines for use by the bus drivers
477 extern int __must_check device_register(struct device *dev);
478 extern void device_unregister(struct device *dev);
479 extern void device_initialize(struct device *dev);
480 extern int __must_check device_add(struct device *dev);
481 extern void device_del(struct device *dev);
482 extern int device_for_each_child(struct device *dev, void *data,
483 int (*fn)(struct device *dev, void *data));
484 extern struct device *device_find_child(struct device *dev, void *data,
485 int (*match)(struct device *dev, void *data));
486 extern int device_rename(struct device *dev, char *new_name);
487 extern int device_move(struct device *dev, struct device *new_parent,
488 enum dpm_order dpm_order);
491 * Root device objects for grouping under /sys/devices
493 extern struct device *__root_device_register(const char *name,
494 struct module *owner);
495 static inline struct device *root_device_register(const char *name)
497 return __root_device_register(name, THIS_MODULE);
499 extern void root_device_unregister(struct device *root);
502 * Manual binding of a device to driver. See drivers/base/bus.c
503 * for information on use.
505 extern int __must_check device_bind_driver(struct device *dev);
506 extern void device_release_driver(struct device *dev);
507 extern int __must_check device_attach(struct device *dev);
508 extern int __must_check driver_attach(struct device_driver *drv);
509 extern int __must_check device_reprobe(struct device *dev);
512 * Easy functions for dynamically creating devices on the fly
514 extern struct device *device_create_vargs(struct class *cls,
515 struct device *parent,
520 extern struct device *device_create(struct class *cls, struct device *parent,
521 dev_t devt, void *drvdata,
522 const char *fmt, ...)
523 __attribute__((format(printf, 5, 6)));
524 extern void device_destroy(struct class *cls, dev_t devt);
527 * Platform "fixup" functions - allow the platform to have their say
528 * about devices and actions that the general device layer doesn't
531 /* Notify platform of device discovery */
532 extern int (*platform_notify)(struct device *dev);
534 extern int (*platform_notify_remove)(struct device *dev);
538 * get_device - atomically increment the reference count for the device.
541 extern struct device *get_device(struct device *dev);
542 extern void put_device(struct device *dev);
544 extern void wait_for_device_probe(void);
546 /* drivers/base/power/shutdown.c */
547 extern void device_shutdown(void);
549 /* drivers/base/sys.c */
550 extern void sysdev_shutdown(void);
552 /* debugging and troubleshooting/diagnostic helpers. */
553 extern const char *dev_driver_string(const struct device *dev);
554 #define dev_printk(level, dev, format, arg...) \
555 printk(level "%s %s: " format , dev_driver_string(dev) , \
556 dev_name(dev) , ## arg)
558 #define dev_emerg(dev, format, arg...) \
559 dev_printk(KERN_EMERG , dev , format , ## arg)
560 #define dev_alert(dev, format, arg...) \
561 dev_printk(KERN_ALERT , dev , format , ## arg)
562 #define dev_crit(dev, format, arg...) \
563 dev_printk(KERN_CRIT , dev , format , ## arg)
564 #define dev_err(dev, format, arg...) \
565 dev_printk(KERN_ERR , dev , format , ## arg)
566 #define dev_warn(dev, format, arg...) \
567 dev_printk(KERN_WARNING , dev , format , ## arg)
568 #define dev_notice(dev, format, arg...) \
569 dev_printk(KERN_NOTICE , dev , format , ## arg)
570 #define dev_info(dev, format, arg...) \
571 dev_printk(KERN_INFO , dev , format , ## arg)
574 #define dev_dbg(dev, format, arg...) \
575 dev_printk(KERN_DEBUG , dev , format , ## arg)
576 #elif defined(CONFIG_DYNAMIC_DEBUG)
577 #define dev_dbg(dev, format, ...) do { \
578 dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
581 #define dev_dbg(dev, format, arg...) \
582 ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
586 #define dev_vdbg dev_dbg
589 #define dev_vdbg(dev, format, arg...) \
590 ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
594 * dev_WARN() acts like dev_printk(), but with the key difference
595 * of using a WARN/WARN_ON to get the message out, including the
596 * file/line information and a backtrace.
598 #define dev_WARN(dev, format, arg...) \
599 WARN(1, "Device: %s\n" format, dev_driver_string(dev), ## arg);
601 /* Create alias, so I can be autoloaded. */
602 #define MODULE_ALIAS_CHARDEV(major,minor) \
603 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
604 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
605 MODULE_ALIAS("char-major-" __stringify(major) "-*")
606 #endif /* _DEVICE_H_ */