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linux
1/*
2 * device.h - generic, centralized driver model
3 *
4 * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
5 * Copyright (c) 2004-2007 Greg Kroah-Hartman <gregkh@suse.de>
6 *
7 * This file is released under the GPLv2
8 *
9 * See Documentation/driver-model/ for more information.
10 */
11
12#ifndef _DEVICE_H_
13#define _DEVICE_H_
14
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>
23#include <linux/pm.h>
24#include <linux/semaphore.h>
25#include <asm/atomic.h>
26#include <asm/device.h>
27
28#define BUS_ID_SIZE 20
29
30struct device;
31struct device_private;
32struct device_driver;
33struct driver_private;
34struct class;
35struct class_private;
36struct bus_type;
37struct bus_type_private;
38
39struct 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);
43};
44
45#define BUS_ATTR(_name, _mode, _show, _store) \
46struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
47
48extern int __must_check bus_create_file(struct bus_type *,
49 struct bus_attribute *);
50extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
51
52struct bus_type {
53 const char *name;
54 struct bus_attribute *bus_attrs;
55 struct device_attribute *dev_attrs;
56 struct driver_attribute *drv_attrs;
57
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);
63
64 int (*suspend)(struct device *dev, pm_message_t state);
65 int (*resume)(struct device *dev);
66
67 struct dev_pm_ops *pm;
68
69 struct bus_type_private *p;
70};
71
72extern int __must_check bus_register(struct bus_type *bus);
73extern void bus_unregister(struct bus_type *bus);
74
75extern int __must_check bus_rescan_devices(struct bus_type *bus);
76
77/* iterator helpers for buses */
78
79int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
80 int (*fn)(struct device *dev, void *data));
81struct device *bus_find_device(struct bus_type *bus, struct device *start,
82 void *data,
83 int (*match)(struct device *dev, void *data));
84struct device *bus_find_device_by_name(struct bus_type *bus,
85 struct device *start,
86 const char *name);
87
88int __must_check bus_for_each_drv(struct bus_type *bus,
89 struct device_driver *start, void *data,
90 int (*fn)(struct device_driver *, void *));
91
92void bus_sort_breadthfirst(struct bus_type *bus,
93 int (*compare)(const struct device *a,
94 const struct device *b));
95/*
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
99 * notify hooks.
100 */
101struct notifier_block;
102
103extern int bus_register_notifier(struct bus_type *bus,
104 struct notifier_block *nb);
105extern int bus_unregister_notifier(struct bus_type *bus,
106 struct notifier_block *nb);
107
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.
111 */
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
116 unbound */
117#define BUS_NOTIFY_UNBOUND_DRIVER 0x00000005 /* driver is unbound
118 from the device */
119
120extern struct kset *bus_get_kset(struct bus_type *bus);
121extern struct klist *bus_get_device_klist(struct bus_type *bus);
122
123struct device_driver {
124 const char *name;
125 struct bus_type *bus;
126
127 struct module *owner;
128 const char *mod_name; /* used for built-in modules */
129
130 int (*probe) (struct device *dev);
131 int (*remove) (struct device *dev);
132 void (*shutdown) (struct device *dev);
133 int (*suspend) (struct device *dev, pm_message_t state);
134 int (*resume) (struct device *dev);
135 struct attribute_group **groups;
136
137 struct dev_pm_ops *pm;
138
139 struct driver_private *p;
140};
141
142
143extern int __must_check driver_register(struct device_driver *drv);
144extern void driver_unregister(struct device_driver *drv);
145
146extern struct device_driver *get_driver(struct device_driver *drv);
147extern void put_driver(struct device_driver *drv);
148extern struct device_driver *driver_find(const char *name,
149 struct bus_type *bus);
150extern int driver_probe_done(void);
151extern void wait_for_device_probe(void);
152
153
154/* sysfs interface for exporting driver attributes */
155
156struct driver_attribute {
157 struct attribute attr;
158 ssize_t (*show)(struct device_driver *driver, char *buf);
159 ssize_t (*store)(struct device_driver *driver, const char *buf,
160 size_t count);
161};
162
163#define DRIVER_ATTR(_name, _mode, _show, _store) \
164struct driver_attribute driver_attr_##_name = \
165 __ATTR(_name, _mode, _show, _store)
166
167extern int __must_check driver_create_file(struct device_driver *driver,
168 struct driver_attribute *attr);
169extern void driver_remove_file(struct device_driver *driver,
170 struct driver_attribute *attr);
171
172extern int __must_check driver_add_kobj(struct device_driver *drv,
173 struct kobject *kobj,
174 const char *fmt, ...);
175
176extern int __must_check driver_for_each_device(struct device_driver *drv,
177 struct device *start,
178 void *data,
179 int (*fn)(struct device *dev,
180 void *));
181struct device *driver_find_device(struct device_driver *drv,
182 struct device *start, void *data,
183 int (*match)(struct device *dev, void *data));
184
185/*
186 * device classes
187 */
188struct class {
189 const char *name;
190 struct module *owner;
191
192 struct class_attribute *class_attrs;
193 struct device_attribute *dev_attrs;
194 struct kobject *dev_kobj;
195
196 int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
197 char *(*nodename)(struct device *dev);
198
199 void (*class_release)(struct class *class);
200 void (*dev_release)(struct device *dev);
201
202 int (*suspend)(struct device *dev, pm_message_t state);
203 int (*resume)(struct device *dev);
204
205 struct dev_pm_ops *pm;
206 struct class_private *p;
207};
208
209struct class_dev_iter {
210 struct klist_iter ki;
211 const struct device_type *type;
212};
213
214extern struct kobject *sysfs_dev_block_kobj;
215extern struct kobject *sysfs_dev_char_kobj;
216extern int __must_check __class_register(struct class *class,
217 struct lock_class_key *key);
218extern void class_unregister(struct class *class);
219
220/* This is a #define to keep the compiler from merging different
221 * instances of the __key variable */
222#define class_register(class) \
223({ \
224 static struct lock_class_key __key; \
225 __class_register(class, &__key); \
226})
227
228extern void class_dev_iter_init(struct class_dev_iter *iter,
229 struct class *class,
230 struct device *start,
231 const struct device_type *type);
232extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
233extern void class_dev_iter_exit(struct class_dev_iter *iter);
234
235extern int class_for_each_device(struct class *class, struct device *start,
236 void *data,
237 int (*fn)(struct device *dev, void *data));
238extern struct device *class_find_device(struct class *class,
239 struct device *start, void *data,
240 int (*match)(struct device *, void *));
241
242struct 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);
246};
247
248#define CLASS_ATTR(_name, _mode, _show, _store) \
249struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
250
251extern int __must_check class_create_file(struct class *class,
252 const struct class_attribute *attr);
253extern void class_remove_file(struct class *class,
254 const struct class_attribute *attr);
255
256struct class_interface {
257 struct list_head node;
258 struct class *class;
259
260 int (*add_dev) (struct device *, struct class_interface *);
261 void (*remove_dev) (struct device *, struct class_interface *);
262};
263
264extern int __must_check class_interface_register(struct class_interface *);
265extern void class_interface_unregister(struct class_interface *);
266
267extern struct class * __must_check __class_create(struct module *owner,
268 const char *name,
269 struct lock_class_key *key);
270extern void class_destroy(struct class *cls);
271
272/* This is a #define to keep the compiler from merging different
273 * instances of the __key variable */
274#define class_create(owner, name) \
275({ \
276 static struct lock_class_key __key; \
277 __class_create(owner, name, &__key); \
278})
279
280/*
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.
288 */
289struct device_type {
290 const char *name;
291 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);
295
296 struct dev_pm_ops *pm;
297};
298
299/* interface for exporting device attributes */
300struct device_attribute {
301 struct attribute attr;
302 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
303 char *buf);
304 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
305 const char *buf, size_t count);
306};
307
308#define DEVICE_ATTR(_name, _mode, _show, _store) \
309struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
310
311extern int __must_check device_create_file(struct device *device,
312 struct device_attribute *entry);
313extern void device_remove_file(struct device *dev,
314 struct device_attribute *attr);
315extern int __must_check device_create_bin_file(struct device *dev,
316 struct bin_attribute *attr);
317extern void device_remove_bin_file(struct device *dev,
318 struct bin_attribute *attr);
319extern int device_schedule_callback_owner(struct device *dev,
320 void (*func)(struct device *dev), struct module *owner);
321
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)
325
326/* device resource management */
327typedef void (*dr_release_t)(struct device *dev, void *res);
328typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
329
330#ifdef CONFIG_DEBUG_DEVRES
331extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
332 const char *name);
333#define devres_alloc(release, size, gfp) \
334 __devres_alloc(release, size, gfp, #release)
335#else
336extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
337#endif
338extern void devres_free(void *res);
339extern void devres_add(struct device *dev, void *res);
340extern void *devres_find(struct device *dev, dr_release_t release,
341 dr_match_t match, void *match_data);
342extern void *devres_get(struct device *dev, void *new_res,
343 dr_match_t match, void *match_data);
344extern void *devres_remove(struct device *dev, dr_release_t release,
345 dr_match_t match, void *match_data);
346extern int devres_destroy(struct device *dev, dr_release_t release,
347 dr_match_t match, void *match_data);
348
349/* devres group */
350extern void * __must_check devres_open_group(struct device *dev, void *id,
351 gfp_t gfp);
352extern void devres_close_group(struct device *dev, void *id);
353extern void devres_remove_group(struct device *dev, void *id);
354extern int devres_release_group(struct device *dev, void *id);
355
356/* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
357extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
358extern void devm_kfree(struct device *dev, void *p);
359
360struct device_dma_parameters {
361 /*
362 * a low level driver may set these to teach IOMMU code about
363 * sg limitations.
364 */
365 unsigned int max_segment_size;
366 unsigned long segment_boundary_mask;
367};
368
369struct device {
370 struct device *parent;
371
372 struct device_private *p;
373
374 struct kobject kobj;
375 const char *init_name; /* initial name of the device */
376 struct device_type *type;
377
378 struct semaphore sem; /* semaphore to synchronize calls to
379 * its driver.
380 */
381
382 struct bus_type *bus; /* type of bus device is on */
383 struct device_driver *driver; /* which driver has allocated this
384 device */
385 void *driver_data; /* data private to the driver */
386 void *platform_data; /* Platform specific data, device
387 core doesn't touch it */
388 struct dev_pm_info power;
389
390#ifdef CONFIG_NUMA
391 int numa_node; /* NUMA node this device is close to */
392#endif
393 u64 *dma_mask; /* dma mask (if dma'able device) */
394 u64 coherent_dma_mask;/* Like dma_mask, but for
395 alloc_coherent mappings as
396 not all hardware supports
397 64 bit addresses for consistent
398 allocations such descriptors. */
399
400 struct device_dma_parameters *dma_parms;
401
402 struct list_head dma_pools; /* dma pools (if dma'ble) */
403
404 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
405 override */
406 /* arch specific additions */
407 struct dev_archdata archdata;
408
409 dev_t devt; /* dev_t, creates the sysfs "dev" */
410
411 spinlock_t devres_lock;
412 struct list_head devres_head;
413
414 struct klist_node knode_class;
415 struct class *class;
416 struct attribute_group **groups; /* optional groups */
417
418 void (*release)(struct device *dev);
419};
420
421/* Get the wakeup routines, which depend on struct device */
422#include <linux/pm_wakeup.h>
423
424static inline const char *dev_name(const struct device *dev)
425{
426 return kobject_name(&dev->kobj);
427}
428
429extern int dev_set_name(struct device *dev, const char *name, ...)
430 __attribute__((format(printf, 2, 3)));
431
432#ifdef CONFIG_NUMA
433static inline int dev_to_node(struct device *dev)
434{
435 return dev->numa_node;
436}
437static inline void set_dev_node(struct device *dev, int node)
438{
439 dev->numa_node = node;
440}
441#else
442static inline int dev_to_node(struct device *dev)
443{
444 return -1;
445}
446static inline void set_dev_node(struct device *dev, int node)
447{
448}
449#endif
450
451static inline void *dev_get_drvdata(const struct device *dev)
452{
453 return dev->driver_data;
454}
455
456static inline void dev_set_drvdata(struct device *dev, void *data)
457{
458 dev->driver_data = data;
459}
460
461static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
462{
463 return dev->kobj.uevent_suppress;
464}
465
466static inline void dev_set_uevent_suppress(struct device *dev, int val)
467{
468 dev->kobj.uevent_suppress = val;
469}
470
471static inline int device_is_registered(struct device *dev)
472{
473 return dev->kobj.state_in_sysfs;
474}
475
476void driver_init(void);
477
478/*
479 * High level routines for use by the bus drivers
480 */
481extern int __must_check device_register(struct device *dev);
482extern void device_unregister(struct device *dev);
483extern void device_initialize(struct device *dev);
484extern int __must_check device_add(struct device *dev);
485extern void device_del(struct device *dev);
486extern int device_for_each_child(struct device *dev, void *data,
487 int (*fn)(struct device *dev, void *data));
488extern struct device *device_find_child(struct device *dev, void *data,
489 int (*match)(struct device *dev, void *data));
490extern int device_rename(struct device *dev, char *new_name);
491extern int device_move(struct device *dev, struct device *new_parent,
492 enum dpm_order dpm_order);
493extern const char *device_get_nodename(struct device *dev, const char **tmp);
494
495/*
496 * Root device objects for grouping under /sys/devices
497 */
498extern struct device *__root_device_register(const char *name,
499 struct module *owner);
500static inline struct device *root_device_register(const char *name)
501{
502 return __root_device_register(name, THIS_MODULE);
503}
504extern void root_device_unregister(struct device *root);
505
506/*
507 * Manual binding of a device to driver. See drivers/base/bus.c
508 * for information on use.
509 */
510extern int __must_check device_bind_driver(struct device *dev);
511extern void device_release_driver(struct device *dev);
512extern int __must_check device_attach(struct device *dev);
513extern int __must_check driver_attach(struct device_driver *drv);
514extern int __must_check device_reprobe(struct device *dev);
515
516/*
517 * Easy functions for dynamically creating devices on the fly
518 */
519extern struct device *device_create_vargs(struct class *cls,
520 struct device *parent,
521 dev_t devt,
522 void *drvdata,
523 const char *fmt,
524 va_list vargs);
525extern struct device *device_create(struct class *cls, struct device *parent,
526 dev_t devt, void *drvdata,
527 const char *fmt, ...)
528 __attribute__((format(printf, 5, 6)));
529extern void device_destroy(struct class *cls, dev_t devt);
530
531/*
532 * Platform "fixup" functions - allow the platform to have their say
533 * about devices and actions that the general device layer doesn't
534 * know about.
535 */
536/* Notify platform of device discovery */
537extern int (*platform_notify)(struct device *dev);
538
539extern int (*platform_notify_remove)(struct device *dev);
540
541
542/**
543 * get_device - atomically increment the reference count for the device.
544 *
545 */
546extern struct device *get_device(struct device *dev);
547extern void put_device(struct device *dev);
548
549extern void wait_for_device_probe(void);
550
551/* drivers/base/power/shutdown.c */
552extern void device_shutdown(void);
553
554/* drivers/base/sys.c */
555extern void sysdev_shutdown(void);
556
557/* debugging and troubleshooting/diagnostic helpers. */
558extern const char *dev_driver_string(const struct device *dev);
559#define dev_printk(level, dev, format, arg...) \
560 printk(level "%s %s: " format , dev_driver_string(dev) , \
561 dev_name(dev) , ## arg)
562
563#define dev_emerg(dev, format, arg...) \
564 dev_printk(KERN_EMERG , dev , format , ## arg)
565#define dev_alert(dev, format, arg...) \
566 dev_printk(KERN_ALERT , dev , format , ## arg)
567#define dev_crit(dev, format, arg...) \
568 dev_printk(KERN_CRIT , dev , format , ## arg)
569#define dev_err(dev, format, arg...) \
570 dev_printk(KERN_ERR , dev , format , ## arg)
571#define dev_warn(dev, format, arg...) \
572 dev_printk(KERN_WARNING , dev , format , ## arg)
573#define dev_notice(dev, format, arg...) \
574 dev_printk(KERN_NOTICE , dev , format , ## arg)
575#define dev_info(dev, format, arg...) \
576 dev_printk(KERN_INFO , dev , format , ## arg)
577
578#if defined(DEBUG)
579#define dev_dbg(dev, format, arg...) \
580 dev_printk(KERN_DEBUG , dev , format , ## arg)
581#elif defined(CONFIG_DYNAMIC_DEBUG)
582#define dev_dbg(dev, format, ...) do { \
583 dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
584 } while (0)
585#else
586#define dev_dbg(dev, format, arg...) \
587 ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
588#endif
589
590#ifdef VERBOSE_DEBUG
591#define dev_vdbg dev_dbg
592#else
593
594#define dev_vdbg(dev, format, arg...) \
595 ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
596#endif
597
598/*
599 * dev_WARN() acts like dev_printk(), but with the key difference
600 * of using a WARN/WARN_ON to get the message out, including the
601 * file/line information and a backtrace.
602 */
603#define dev_WARN(dev, format, arg...) \
604 WARN(1, "Device: %s\n" format, dev_driver_string(dev), ## arg);
605
606/* Create alias, so I can be autoloaded. */
607#define MODULE_ALIAS_CHARDEV(major,minor) \
608 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
609#define MODULE_ALIAS_CHARDEV_MAJOR(major) \
610 MODULE_ALIAS("char-major-" __stringify(major) "-*")
611#endif /* _DEVICE_H_ */