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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 (*suspend_late)(struct device *dev, pm_message_t state);
66 int (*resume_early)(struct device *dev);
67 int (*resume)(struct device *dev);
68
69 struct dev_pm_ops *pm;
70
71 struct bus_type_private *p;
72};
73
74extern int __must_check bus_register(struct bus_type *bus);
75extern void bus_unregister(struct bus_type *bus);
76
77extern int __must_check bus_rescan_devices(struct bus_type *bus);
78
79/* iterator helpers for buses */
80
81int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
82 int (*fn)(struct device *dev, void *data));
83struct device *bus_find_device(struct bus_type *bus, struct device *start,
84 void *data,
85 int (*match)(struct device *dev, void *data));
86struct device *bus_find_device_by_name(struct bus_type *bus,
87 struct device *start,
88 const char *name);
89
90int __must_check bus_for_each_drv(struct bus_type *bus,
91 struct device_driver *start, void *data,
92 int (*fn)(struct device_driver *, void *));
93
94void bus_sort_breadthfirst(struct bus_type *bus,
95 int (*compare)(const struct device *a,
96 const struct device *b));
97/*
98 * Bus notifiers: Get notified of addition/removal of devices
99 * and binding/unbinding of drivers to devices.
100 * In the long run, it should be a replacement for the platform
101 * notify hooks.
102 */
103struct notifier_block;
104
105extern int bus_register_notifier(struct bus_type *bus,
106 struct notifier_block *nb);
107extern int bus_unregister_notifier(struct bus_type *bus,
108 struct notifier_block *nb);
109
110/* All 4 notifers below get called with the target struct device *
111 * as an argument. Note that those functions are likely to be called
112 * with the device semaphore held in the core, so be careful.
113 */
114#define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
115#define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device removed */
116#define BUS_NOTIFY_BOUND_DRIVER 0x00000003 /* driver bound to device */
117#define BUS_NOTIFY_UNBIND_DRIVER 0x00000004 /* driver about to be
118 unbound */
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
198 void (*class_release)(struct class *class);
199 void (*dev_release)(struct device *dev);
200
201 int (*suspend)(struct device *dev, pm_message_t state);
202 int (*resume)(struct device *dev);
203
204 struct dev_pm_ops *pm;
205 struct class_private *p;
206};
207
208struct class_dev_iter {
209 struct klist_iter ki;
210 const struct device_type *type;
211};
212
213extern struct kobject *sysfs_dev_block_kobj;
214extern struct kobject *sysfs_dev_char_kobj;
215extern int __must_check __class_register(struct class *class,
216 struct lock_class_key *key);
217extern void class_unregister(struct class *class);
218
219/* This is a #define to keep the compiler from merging different
220 * instances of the __key variable */
221#define class_register(class) \
222({ \
223 static struct lock_class_key __key; \
224 __class_register(class, &__key); \
225})
226
227extern void class_dev_iter_init(struct class_dev_iter *iter,
228 struct class *class,
229 struct device *start,
230 const struct device_type *type);
231extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
232extern void class_dev_iter_exit(struct class_dev_iter *iter);
233
234extern int class_for_each_device(struct class *class, struct device *start,
235 void *data,
236 int (*fn)(struct device *dev, void *data));
237extern struct device *class_find_device(struct class *class,
238 struct device *start, void *data,
239 int (*match)(struct device *, void *));
240
241struct class_attribute {
242 struct attribute attr;
243 ssize_t (*show)(struct class *class, char *buf);
244 ssize_t (*store)(struct class *class, const char *buf, size_t count);
245};
246
247#define CLASS_ATTR(_name, _mode, _show, _store) \
248struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
249
250extern int __must_check class_create_file(struct class *class,
251 const struct class_attribute *attr);
252extern void class_remove_file(struct class *class,
253 const struct class_attribute *attr);
254
255struct class_interface {
256 struct list_head node;
257 struct class *class;
258
259 int (*add_dev) (struct device *, struct class_interface *);
260 void (*remove_dev) (struct device *, struct class_interface *);
261};
262
263extern int __must_check class_interface_register(struct class_interface *);
264extern void class_interface_unregister(struct class_interface *);
265
266extern struct class * __must_check __class_create(struct module *owner,
267 const char *name,
268 struct lock_class_key *key);
269extern void class_destroy(struct class *cls);
270
271/* This is a #define to keep the compiler from merging different
272 * instances of the __key variable */
273#define class_create(owner, name) \
274({ \
275 static struct lock_class_key __key; \
276 __class_create(owner, name, &__key); \
277})
278
279/*
280 * The type of device, "struct device" is embedded in. A class
281 * or bus can contain devices of different types
282 * like "partitions" and "disks", "mouse" and "event".
283 * This identifies the device type and carries type-specific
284 * information, equivalent to the kobj_type of a kobject.
285 * If "name" is specified, the uevent will contain it in
286 * the DEVTYPE variable.
287 */
288struct device_type {
289 const char *name;
290 struct attribute_group **groups;
291 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
292 void (*release)(struct device *dev);
293
294 int (*suspend)(struct device *dev, pm_message_t state);
295 int (*resume)(struct device *dev);
296
297 struct dev_pm_ops *pm;
298};
299
300/* interface for exporting device attributes */
301struct device_attribute {
302 struct attribute attr;
303 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
304 char *buf);
305 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
306 const char *buf, size_t count);
307};
308
309#define DEVICE_ATTR(_name, _mode, _show, _store) \
310struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
311
312extern int __must_check device_create_file(struct device *device,
313 struct device_attribute *entry);
314extern void device_remove_file(struct device *dev,
315 struct device_attribute *attr);
316extern int __must_check device_create_bin_file(struct device *dev,
317 struct bin_attribute *attr);
318extern void device_remove_bin_file(struct device *dev,
319 struct bin_attribute *attr);
320extern int device_schedule_callback_owner(struct device *dev,
321 void (*func)(struct device *dev), struct module *owner);
322
323/* This is a macro to avoid include problems with THIS_MODULE */
324#define device_schedule_callback(dev, func) \
325 device_schedule_callback_owner(dev, func, THIS_MODULE)
326
327/* device resource management */
328typedef void (*dr_release_t)(struct device *dev, void *res);
329typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
330
331#ifdef CONFIG_DEBUG_DEVRES
332extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
333 const char *name);
334#define devres_alloc(release, size, gfp) \
335 __devres_alloc(release, size, gfp, #release)
336#else
337extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
338#endif
339extern void devres_free(void *res);
340extern void devres_add(struct device *dev, void *res);
341extern void *devres_find(struct device *dev, dr_release_t release,
342 dr_match_t match, void *match_data);
343extern void *devres_get(struct device *dev, void *new_res,
344 dr_match_t match, void *match_data);
345extern void *devres_remove(struct device *dev, dr_release_t release,
346 dr_match_t match, void *match_data);
347extern int devres_destroy(struct device *dev, dr_release_t release,
348 dr_match_t match, void *match_data);
349
350/* devres group */
351extern void * __must_check devres_open_group(struct device *dev, void *id,
352 gfp_t gfp);
353extern void devres_close_group(struct device *dev, void *id);
354extern void devres_remove_group(struct device *dev, void *id);
355extern int devres_release_group(struct device *dev, void *id);
356
357/* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
358extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
359extern void devm_kfree(struct device *dev, void *p);
360
361struct device_dma_parameters {
362 /*
363 * a low level driver may set these to teach IOMMU code about
364 * sg limitations.
365 */
366 unsigned int max_segment_size;
367 unsigned long segment_boundary_mask;
368};
369
370struct device {
371 struct device *parent;
372
373 struct device_private *p;
374
375 struct kobject kobj;
376 const char *init_name; /* initial name of the device */
377 struct device_type *type;
378
379 struct semaphore sem; /* semaphore to synchronize calls to
380 * its driver.
381 */
382
383 struct bus_type *bus; /* type of bus device is on */
384 struct device_driver *driver; /* which driver has allocated this
385 device */
386 void *driver_data; /* data private to the driver */
387
388 void *platform_data; /* We will remove platform_data
389 field if all platform devices
390 pass its platform specific data
391 from platform_device->platform_data,
392 other kind of devices should not
393 use platform_data. */
394 struct dev_pm_info power;
395
396#ifdef CONFIG_NUMA
397 int numa_node; /* NUMA node this device is close to */
398#endif
399 u64 *dma_mask; /* dma mask (if dma'able device) */
400 u64 coherent_dma_mask;/* Like dma_mask, but for
401 alloc_coherent mappings as
402 not all hardware supports
403 64 bit addresses for consistent
404 allocations such descriptors. */
405
406 struct device_dma_parameters *dma_parms;
407
408 struct list_head dma_pools; /* dma pools (if dma'ble) */
409
410 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
411 override */
412 /* arch specific additions */
413 struct dev_archdata archdata;
414
415 dev_t devt; /* dev_t, creates the sysfs "dev" */
416
417 spinlock_t devres_lock;
418 struct list_head devres_head;
419
420 struct klist_node knode_class;
421 struct class *class;
422 struct attribute_group **groups; /* optional groups */
423
424 void (*release)(struct device *dev);
425};
426
427/* Get the wakeup routines, which depend on struct device */
428#include <linux/pm_wakeup.h>
429
430static inline const char *dev_name(const struct device *dev)
431{
432 return kobject_name(&dev->kobj);
433}
434
435extern int dev_set_name(struct device *dev, const char *name, ...)
436 __attribute__((format(printf, 2, 3)));
437
438#ifdef CONFIG_NUMA
439static inline int dev_to_node(struct device *dev)
440{
441 return dev->numa_node;
442}
443static inline void set_dev_node(struct device *dev, int node)
444{
445 dev->numa_node = node;
446}
447#else
448static inline int dev_to_node(struct device *dev)
449{
450 return -1;
451}
452static inline void set_dev_node(struct device *dev, int node)
453{
454}
455#endif
456
457static inline void *dev_get_drvdata(const struct device *dev)
458{
459 return dev->driver_data;
460}
461
462static inline void dev_set_drvdata(struct device *dev, void *data)
463{
464 dev->driver_data = data;
465}
466
467static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
468{
469 return dev->kobj.uevent_suppress;
470}
471
472static inline void dev_set_uevent_suppress(struct device *dev, int val)
473{
474 dev->kobj.uevent_suppress = val;
475}
476
477static inline int device_is_registered(struct device *dev)
478{
479 return dev->kobj.state_in_sysfs;
480}
481
482void driver_init(void);
483
484/*
485 * High level routines for use by the bus drivers
486 */
487extern int __must_check device_register(struct device *dev);
488extern void device_unregister(struct device *dev);
489extern void device_initialize(struct device *dev);
490extern int __must_check device_add(struct device *dev);
491extern void device_del(struct device *dev);
492extern int device_for_each_child(struct device *dev, void *data,
493 int (*fn)(struct device *dev, void *data));
494extern struct device *device_find_child(struct device *dev, void *data,
495 int (*match)(struct device *dev, void *data));
496extern int device_rename(struct device *dev, char *new_name);
497extern int device_move(struct device *dev, struct device *new_parent,
498 enum dpm_order dpm_order);
499
500/*
501 * Root device objects for grouping under /sys/devices
502 */
503extern struct device *__root_device_register(const char *name,
504 struct module *owner);
505static inline struct device *root_device_register(const char *name)
506{
507 return __root_device_register(name, THIS_MODULE);
508}
509extern void root_device_unregister(struct device *root);
510
511/*
512 * Manual binding of a device to driver. See drivers/base/bus.c
513 * for information on use.
514 */
515extern int __must_check device_bind_driver(struct device *dev);
516extern void device_release_driver(struct device *dev);
517extern int __must_check device_attach(struct device *dev);
518extern int __must_check driver_attach(struct device_driver *drv);
519extern int __must_check device_reprobe(struct device *dev);
520
521/*
522 * Easy functions for dynamically creating devices on the fly
523 */
524extern struct device *device_create_vargs(struct class *cls,
525 struct device *parent,
526 dev_t devt,
527 void *drvdata,
528 const char *fmt,
529 va_list vargs);
530extern struct device *device_create(struct class *cls, struct device *parent,
531 dev_t devt, void *drvdata,
532 const char *fmt, ...)
533 __attribute__((format(printf, 5, 6)));
534extern void device_destroy(struct class *cls, dev_t devt);
535
536/*
537 * Platform "fixup" functions - allow the platform to have their say
538 * about devices and actions that the general device layer doesn't
539 * know about.
540 */
541/* Notify platform of device discovery */
542extern int (*platform_notify)(struct device *dev);
543
544extern int (*platform_notify_remove)(struct device *dev);
545
546
547/**
548 * get_device - atomically increment the reference count for the device.
549 *
550 */
551extern struct device *get_device(struct device *dev);
552extern void put_device(struct device *dev);
553
554
555/* drivers/base/power/shutdown.c */
556extern void device_shutdown(void);
557
558/* drivers/base/sys.c */
559extern void sysdev_shutdown(void);
560
561/* debugging and troubleshooting/diagnostic helpers. */
562extern const char *dev_driver_string(const struct device *dev);
563#define dev_printk(level, dev, format, arg...) \
564 printk(level "%s %s: " format , dev_driver_string(dev) , \
565 dev_name(dev) , ## arg)
566
567#define dev_emerg(dev, format, arg...) \
568 dev_printk(KERN_EMERG , dev , format , ## arg)
569#define dev_alert(dev, format, arg...) \
570 dev_printk(KERN_ALERT , dev , format , ## arg)
571#define dev_crit(dev, format, arg...) \
572 dev_printk(KERN_CRIT , dev , format , ## arg)
573#define dev_err(dev, format, arg...) \
574 dev_printk(KERN_ERR , dev , format , ## arg)
575#define dev_warn(dev, format, arg...) \
576 dev_printk(KERN_WARNING , dev , format , ## arg)
577#define dev_notice(dev, format, arg...) \
578 dev_printk(KERN_NOTICE , dev , format , ## arg)
579#define dev_info(dev, format, arg...) \
580 dev_printk(KERN_INFO , dev , format , ## arg)
581
582#if defined(DEBUG)
583#define dev_dbg(dev, format, arg...) \
584 dev_printk(KERN_DEBUG , dev , format , ## arg)
585#elif defined(CONFIG_DYNAMIC_DEBUG)
586#define dev_dbg(dev, format, ...) do { \
587 dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
588 } while (0)
589#else
590#define dev_dbg(dev, format, arg...) \
591 ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
592#endif
593
594#ifdef VERBOSE_DEBUG
595#define dev_vdbg dev_dbg
596#else
597
598#define dev_vdbg(dev, format, arg...) \
599 ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
600#endif
601
602/*
603 * dev_WARN() acts like dev_printk(), but with the key difference
604 * of using a WARN/WARN_ON to get the message out, including the
605 * file/line information and a backtrace.
606 */
607#define dev_WARN(dev, format, arg...) \
608 WARN(1, "Device: %s\n" format, dev_driver_string(dev), ## arg);
609
610/* Create alias, so I can be autoloaded. */
611#define MODULE_ALIAS_CHARDEV(major,minor) \
612 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
613#define MODULE_ALIAS_CHARDEV_MAJOR(major) \
614 MODULE_ALIAS("char-major-" __stringify(major) "-*")
615#endif /* _DEVICE_H_ */