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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_driver;
32struct driver_private;
33struct class;
34struct class_private;
35struct bus_type;
36struct bus_type_private;
37
38struct 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);
42};
43
44#define BUS_ATTR(_name, _mode, _show, _store) \
45struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
46
47extern int __must_check bus_create_file(struct bus_type *,
48 struct bus_attribute *);
49extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
50
51struct bus_type {
52 const char *name;
53 struct bus_attribute *bus_attrs;
54 struct device_attribute *dev_attrs;
55 struct driver_attribute *drv_attrs;
56
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);
62
63 int (*suspend)(struct device *dev, pm_message_t state);
64 int (*suspend_late)(struct device *dev, pm_message_t state);
65 int (*resume_early)(struct device *dev);
66 int (*resume)(struct device *dev);
67
68 struct pm_ext_ops *pm;
69
70 struct bus_type_private *p;
71};
72
73extern int __must_check bus_register(struct bus_type *bus);
74extern void bus_unregister(struct bus_type *bus);
75
76extern int __must_check bus_rescan_devices(struct bus_type *bus);
77
78/* iterator helpers for buses */
79
80int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
81 int (*fn)(struct device *dev, void *data));
82struct device *bus_find_device(struct bus_type *bus, struct device *start,
83 void *data,
84 int (*match)(struct device *dev, void *data));
85struct device *bus_find_device_by_name(struct bus_type *bus,
86 struct device *start,
87 const char *name);
88
89int __must_check bus_for_each_drv(struct bus_type *bus,
90 struct device_driver *start, void *data,
91 int (*fn)(struct device_driver *, void *));
92
93/*
94 * Bus notifiers: Get notified of addition/removal of devices
95 * and binding/unbinding of drivers to devices.
96 * In the long run, it should be a replacement for the platform
97 * notify hooks.
98 */
99struct notifier_block;
100
101extern int bus_register_notifier(struct bus_type *bus,
102 struct notifier_block *nb);
103extern int bus_unregister_notifier(struct bus_type *bus,
104 struct notifier_block *nb);
105
106/* All 4 notifers below get called with the target struct device *
107 * as an argument. Note that those functions are likely to be called
108 * with the device semaphore held in the core, so be careful.
109 */
110#define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
111#define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device removed */
112#define BUS_NOTIFY_BOUND_DRIVER 0x00000003 /* driver bound to device */
113#define BUS_NOTIFY_UNBIND_DRIVER 0x00000004 /* driver about to be
114 unbound */
115
116extern struct kset *bus_get_kset(struct bus_type *bus);
117extern struct klist *bus_get_device_klist(struct bus_type *bus);
118
119struct device_driver {
120 const char *name;
121 struct bus_type *bus;
122
123 struct module *owner;
124 const char *mod_name; /* used for built-in modules */
125
126 int (*probe) (struct device *dev);
127 int (*remove) (struct device *dev);
128 void (*shutdown) (struct device *dev);
129 int (*suspend) (struct device *dev, pm_message_t state);
130 int (*resume) (struct device *dev);
131 struct attribute_group **groups;
132
133 struct pm_ops *pm;
134
135 struct driver_private *p;
136};
137
138
139extern int __must_check driver_register(struct device_driver *drv);
140extern void driver_unregister(struct device_driver *drv);
141
142extern struct device_driver *get_driver(struct device_driver *drv);
143extern void put_driver(struct device_driver *drv);
144extern struct device_driver *driver_find(const char *name,
145 struct bus_type *bus);
146extern int driver_probe_done(void);
147
148/* sysfs interface for exporting driver attributes */
149
150struct driver_attribute {
151 struct attribute attr;
152 ssize_t (*show)(struct device_driver *driver, char *buf);
153 ssize_t (*store)(struct device_driver *driver, const char *buf,
154 size_t count);
155};
156
157#define DRIVER_ATTR(_name, _mode, _show, _store) \
158struct driver_attribute driver_attr_##_name = \
159 __ATTR(_name, _mode, _show, _store)
160
161extern int __must_check driver_create_file(struct device_driver *driver,
162 struct driver_attribute *attr);
163extern void driver_remove_file(struct device_driver *driver,
164 struct driver_attribute *attr);
165
166extern int __must_check driver_add_kobj(struct device_driver *drv,
167 struct kobject *kobj,
168 const char *fmt, ...);
169
170extern int __must_check driver_for_each_device(struct device_driver *drv,
171 struct device *start,
172 void *data,
173 int (*fn)(struct device *dev,
174 void *));
175struct device *driver_find_device(struct device_driver *drv,
176 struct device *start, void *data,
177 int (*match)(struct device *dev, void *data));
178
179/*
180 * device classes
181 */
182struct class {
183 const char *name;
184 struct module *owner;
185
186 struct class_attribute *class_attrs;
187 struct device_attribute *dev_attrs;
188 struct kobject *dev_kobj;
189
190 int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
191
192 void (*class_release)(struct class *class);
193 void (*dev_release)(struct device *dev);
194
195 int (*suspend)(struct device *dev, pm_message_t state);
196 int (*resume)(struct device *dev);
197
198 struct pm_ops *pm;
199 struct class_private *p;
200};
201
202extern struct kobject *sysfs_dev_block_kobj;
203extern struct kobject *sysfs_dev_char_kobj;
204extern int __must_check __class_register(struct class *class,
205 struct lock_class_key *key);
206extern void class_unregister(struct class *class);
207
208/* This is a #define to keep the compiler from merging different
209 * instances of the __key variable */
210#define class_register(class) \
211({ \
212 static struct lock_class_key __key; \
213 __class_register(class, &__key); \
214})
215
216extern int class_for_each_device(struct class *class, struct device *start,
217 void *data,
218 int (*fn)(struct device *dev, void *data));
219extern struct device *class_find_device(struct class *class,
220 struct device *start, void *data,
221 int (*match)(struct device *, void *));
222
223struct class_attribute {
224 struct attribute attr;
225 ssize_t (*show)(struct class *class, char *buf);
226 ssize_t (*store)(struct class *class, const char *buf, size_t count);
227};
228
229#define CLASS_ATTR(_name, _mode, _show, _store) \
230struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
231
232extern int __must_check class_create_file(struct class *class,
233 const struct class_attribute *attr);
234extern void class_remove_file(struct class *class,
235 const struct class_attribute *attr);
236
237struct class_interface {
238 struct list_head node;
239 struct class *class;
240
241 int (*add_dev) (struct device *, struct class_interface *);
242 void (*remove_dev) (struct device *, struct class_interface *);
243};
244
245extern int __must_check class_interface_register(struct class_interface *);
246extern void class_interface_unregister(struct class_interface *);
247
248extern struct class * __must_check __class_create(struct module *owner,
249 const char *name,
250 struct lock_class_key *key);
251extern void class_destroy(struct class *cls);
252
253/* This is a #define to keep the compiler from merging different
254 * instances of the __key variable */
255#define class_create(owner, name) \
256({ \
257 static struct lock_class_key __key; \
258 __class_create(owner, name, &__key); \
259})
260
261/*
262 * The type of device, "struct device" is embedded in. A class
263 * or bus can contain devices of different types
264 * like "partitions" and "disks", "mouse" and "event".
265 * This identifies the device type and carries type-specific
266 * information, equivalent to the kobj_type of a kobject.
267 * If "name" is specified, the uevent will contain it in
268 * the DEVTYPE variable.
269 */
270struct device_type {
271 const char *name;
272 struct attribute_group **groups;
273 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
274 void (*release)(struct device *dev);
275
276 int (*suspend)(struct device *dev, pm_message_t state);
277 int (*resume)(struct device *dev);
278
279 struct pm_ops *pm;
280};
281
282/* interface for exporting device attributes */
283struct device_attribute {
284 struct attribute attr;
285 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
286 char *buf);
287 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
288 const char *buf, size_t count);
289};
290
291#define DEVICE_ATTR(_name, _mode, _show, _store) \
292struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
293
294extern int __must_check device_create_file(struct device *device,
295 struct device_attribute *entry);
296extern void device_remove_file(struct device *dev,
297 struct device_attribute *attr);
298extern int __must_check device_create_bin_file(struct device *dev,
299 struct bin_attribute *attr);
300extern void device_remove_bin_file(struct device *dev,
301 struct bin_attribute *attr);
302extern int device_schedule_callback_owner(struct device *dev,
303 void (*func)(struct device *dev), struct module *owner);
304
305/* This is a macro to avoid include problems with THIS_MODULE */
306#define device_schedule_callback(dev, func) \
307 device_schedule_callback_owner(dev, func, THIS_MODULE)
308
309/* device resource management */
310typedef void (*dr_release_t)(struct device *dev, void *res);
311typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
312
313#ifdef CONFIG_DEBUG_DEVRES
314extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
315 const char *name);
316#define devres_alloc(release, size, gfp) \
317 __devres_alloc(release, size, gfp, #release)
318#else
319extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
320#endif
321extern void devres_free(void *res);
322extern void devres_add(struct device *dev, void *res);
323extern void *devres_find(struct device *dev, dr_release_t release,
324 dr_match_t match, void *match_data);
325extern void *devres_get(struct device *dev, void *new_res,
326 dr_match_t match, void *match_data);
327extern void *devres_remove(struct device *dev, dr_release_t release,
328 dr_match_t match, void *match_data);
329extern int devres_destroy(struct device *dev, dr_release_t release,
330 dr_match_t match, void *match_data);
331
332/* devres group */
333extern void * __must_check devres_open_group(struct device *dev, void *id,
334 gfp_t gfp);
335extern void devres_close_group(struct device *dev, void *id);
336extern void devres_remove_group(struct device *dev, void *id);
337extern int devres_release_group(struct device *dev, void *id);
338
339/* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
340extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
341extern void devm_kfree(struct device *dev, void *p);
342
343struct device_dma_parameters {
344 /*
345 * a low level driver may set these to teach IOMMU code about
346 * sg limitations.
347 */
348 unsigned int max_segment_size;
349 unsigned long segment_boundary_mask;
350};
351
352struct device {
353 struct klist klist_children;
354 struct klist_node knode_parent; /* node in sibling list */
355 struct klist_node knode_driver;
356 struct klist_node knode_bus;
357 struct device *parent;
358
359 struct kobject kobj;
360 char bus_id[BUS_ID_SIZE]; /* position on parent bus */
361 const char *init_name; /* initial name of the device */
362 struct device_type *type;
363 unsigned uevent_suppress:1;
364
365 struct semaphore sem; /* semaphore to synchronize calls to
366 * its driver.
367 */
368
369 struct bus_type *bus; /* type of bus device is on */
370 struct device_driver *driver; /* which driver has allocated this
371 device */
372 void *driver_data; /* data private to the driver */
373 void *platform_data; /* Platform specific data, device
374 core doesn't touch it */
375 struct dev_pm_info power;
376
377#ifdef CONFIG_NUMA
378 int numa_node; /* NUMA node this device is close to */
379#endif
380 u64 *dma_mask; /* dma mask (if dma'able device) */
381 u64 coherent_dma_mask;/* Like dma_mask, but for
382 alloc_coherent mappings as
383 not all hardware supports
384 64 bit addresses for consistent
385 allocations such descriptors. */
386
387 struct device_dma_parameters *dma_parms;
388
389 struct list_head dma_pools; /* dma pools (if dma'ble) */
390
391 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
392 override */
393 /* arch specific additions */
394 struct dev_archdata archdata;
395
396 spinlock_t devres_lock;
397 struct list_head devres_head;
398
399 struct list_head node;
400 struct class *class;
401 dev_t devt; /* dev_t, creates the sysfs "dev" */
402 struct attribute_group **groups; /* optional groups */
403
404 void (*release)(struct device *dev);
405};
406
407/* Get the wakeup routines, which depend on struct device */
408#include <linux/pm_wakeup.h>
409
410static inline const char *dev_name(const struct device *dev)
411{
412 /* will be changed into kobject_name(&dev->kobj) in the near future */
413 return dev->bus_id;
414}
415
416extern int dev_set_name(struct device *dev, const char *name, ...)
417 __attribute__((format(printf, 2, 3)));
418
419#ifdef CONFIG_NUMA
420static inline int dev_to_node(struct device *dev)
421{
422 return dev->numa_node;
423}
424static inline void set_dev_node(struct device *dev, int node)
425{
426 dev->numa_node = node;
427}
428#else
429static inline int dev_to_node(struct device *dev)
430{
431 return -1;
432}
433static inline void set_dev_node(struct device *dev, int node)
434{
435}
436#endif
437
438static inline void *dev_get_drvdata(struct device *dev)
439{
440 return dev->driver_data;
441}
442
443static inline void dev_set_drvdata(struct device *dev, void *data)
444{
445 dev->driver_data = data;
446}
447
448static inline int device_is_registered(struct device *dev)
449{
450 return dev->kobj.state_in_sysfs;
451}
452
453void driver_init(void);
454
455/*
456 * High level routines for use by the bus drivers
457 */
458extern int __must_check device_register(struct device *dev);
459extern void device_unregister(struct device *dev);
460extern void device_initialize(struct device *dev);
461extern int __must_check device_add(struct device *dev);
462extern void device_del(struct device *dev);
463extern int device_for_each_child(struct device *dev, void *data,
464 int (*fn)(struct device *dev, void *data));
465extern struct device *device_find_child(struct device *dev, void *data,
466 int (*match)(struct device *dev, void *data));
467extern int device_rename(struct device *dev, char *new_name);
468extern int device_move(struct device *dev, struct device *new_parent);
469
470/*
471 * Manual binding of a device to driver. See drivers/base/bus.c
472 * for information on use.
473 */
474extern int __must_check device_bind_driver(struct device *dev);
475extern void device_release_driver(struct device *dev);
476extern int __must_check device_attach(struct device *dev);
477extern int __must_check driver_attach(struct device_driver *drv);
478extern int __must_check device_reprobe(struct device *dev);
479
480/*
481 * Easy functions for dynamically creating devices on the fly
482 */
483extern struct device *device_create_vargs(struct class *cls,
484 struct device *parent,
485 dev_t devt,
486 void *drvdata,
487 const char *fmt,
488 va_list vargs);
489extern struct device *device_create(struct class *cls, struct device *parent,
490 dev_t devt, void *drvdata,
491 const char *fmt, ...)
492 __attribute__((format(printf, 5, 6)));
493#define device_create_drvdata device_create
494extern void device_destroy(struct class *cls, dev_t devt);
495
496/*
497 * Platform "fixup" functions - allow the platform to have their say
498 * about devices and actions that the general device layer doesn't
499 * know about.
500 */
501/* Notify platform of device discovery */
502extern int (*platform_notify)(struct device *dev);
503
504extern int (*platform_notify_remove)(struct device *dev);
505
506
507/**
508 * get_device - atomically increment the reference count for the device.
509 *
510 */
511extern struct device *get_device(struct device *dev);
512extern void put_device(struct device *dev);
513
514
515/* drivers/base/power/shutdown.c */
516extern void device_shutdown(void);
517
518/* drivers/base/sys.c */
519extern void sysdev_shutdown(void);
520
521/* debugging and troubleshooting/diagnostic helpers. */
522extern const char *dev_driver_string(const struct device *dev);
523#define dev_printk(level, dev, format, arg...) \
524 printk(level "%s %s: " format , dev_driver_string(dev) , \
525 dev_name(dev) , ## arg)
526
527#define dev_emerg(dev, format, arg...) \
528 dev_printk(KERN_EMERG , dev , format , ## arg)
529#define dev_alert(dev, format, arg...) \
530 dev_printk(KERN_ALERT , dev , format , ## arg)
531#define dev_crit(dev, format, arg...) \
532 dev_printk(KERN_CRIT , dev , format , ## arg)
533#define dev_err(dev, format, arg...) \
534 dev_printk(KERN_ERR , dev , format , ## arg)
535#define dev_warn(dev, format, arg...) \
536 dev_printk(KERN_WARNING , dev , format , ## arg)
537#define dev_notice(dev, format, arg...) \
538 dev_printk(KERN_NOTICE , dev , format , ## arg)
539#define dev_info(dev, format, arg...) \
540 dev_printk(KERN_INFO , dev , format , ## arg)
541
542#ifdef DEBUG
543#define dev_dbg(dev, format, arg...) \
544 dev_printk(KERN_DEBUG , dev , format , ## arg)
545#else
546#define dev_dbg(dev, format, arg...) \
547 ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
548#endif
549
550#ifdef VERBOSE_DEBUG
551#define dev_vdbg dev_dbg
552#else
553
554#define dev_vdbg(dev, format, arg...) \
555 ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
556#endif
557
558/* Create alias, so I can be autoloaded. */
559#define MODULE_ALIAS_CHARDEV(major,minor) \
560 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
561#define MODULE_ALIAS_CHARDEV_MAJOR(major) \
562 MODULE_ALIAS("char-major-" __stringify(major) "-*")
563#endif /* _DEVICE_H_ */