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 struct device;
29 struct device_private;
30 struct device_driver;
31 struct driver_private;
32 struct class;
33 struct class_private;
34 struct bus_type;
35 struct bus_type_private;
36
37 struct bus_attribute {
38 struct attribute attr;
39 ssize_t (*show)(struct bus_type *bus, char *buf);
40 ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
41 };
42
43 #define BUS_ATTR(_name, _mode, _show, _store) \
44 struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
45
46 extern int __must_check bus_create_file(struct bus_type *,
47 struct bus_attribute *);
48 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
49
50 struct bus_type {
51 const char *name;
52 struct bus_attribute *bus_attrs;
53 struct device_attribute *dev_attrs;
54 struct driver_attribute *drv_attrs;
55
56 int (*match)(struct device *dev, struct device_driver *drv);
57 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
58 int (*probe)(struct device *dev);
59 int (*remove)(struct device *dev);
60 void (*shutdown)(struct device *dev);
61
62 int (*suspend)(struct device *dev, pm_message_t state);
63 int (*resume)(struct device *dev);
64
65 struct dev_pm_ops *pm;
66
67 struct bus_type_private *p;
68 };
69
70 extern int __must_check bus_register(struct bus_type *bus);
71 extern void bus_unregister(struct bus_type *bus);
72
73 extern int __must_check bus_rescan_devices(struct bus_type *bus);
74
75 /* iterator helpers for buses */
76
77 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
78 int (*fn)(struct device *dev, void *data));
79 struct device *bus_find_device(struct bus_type *bus, struct device *start,
80 void *data,
81 int (*match)(struct device *dev, void *data));
82 struct device *bus_find_device_by_name(struct bus_type *bus,
83 struct device *start,
84 const char *name);
85
86 int __must_check bus_for_each_drv(struct bus_type *bus,
87 struct device_driver *start, void *data,
88 int (*fn)(struct device_driver *, void *));
89
90 void bus_sort_breadthfirst(struct bus_type *bus,
91 int (*compare)(const struct device *a,
92 const struct device *b));
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 */
99 struct notifier_block;
100
101 extern int bus_register_notifier(struct bus_type *bus,
102 struct notifier_block *nb);
103 extern 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 #define BUS_NOTIFY_UNBOUND_DRIVER 0x00000005 /* driver is unbound
116 from the device */
117
118 extern struct kset *bus_get_kset(struct bus_type *bus);
119 extern struct klist *bus_get_device_klist(struct bus_type *bus);
120
121 struct device_driver {
122 const char *name;
123 struct bus_type *bus;
124
125 struct module *owner;
126 const char *mod_name; /* used for built-in modules */
127
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;
134
135 struct dev_pm_ops *pm;
136
137 struct driver_private *p;
138 };
139
140
141 extern int __must_check driver_register(struct device_driver *drv);
142 extern void driver_unregister(struct device_driver *drv);
143
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);
150
151
152 /* sysfs interface for exporting driver attributes */
153
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,
158 size_t count);
159 };
160
161 #define DRIVER_ATTR(_name, _mode, _show, _store) \
162 struct driver_attribute driver_attr_##_name = \
163 __ATTR(_name, _mode, _show, _store)
164
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);
169
170 extern int __must_check driver_add_kobj(struct device_driver *drv,
171 struct kobject *kobj,
172 const char *fmt, ...);
173
174 extern int __must_check driver_for_each_device(struct device_driver *drv,
175 struct device *start,
176 void *data,
177 int (*fn)(struct device *dev,
178 void *));
179 struct device *driver_find_device(struct device_driver *drv,
180 struct device *start, void *data,
181 int (*match)(struct device *dev, void *data));
182
183 /*
184 * device classes
185 */
186 struct class {
187 const char *name;
188 struct module *owner;
189
190 struct class_attribute *class_attrs;
191 struct device_attribute *dev_attrs;
192 struct kobject *dev_kobj;
193
194 int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
195 char *(*nodename)(struct device *dev);
196
197 void (*class_release)(struct class *class);
198 void (*dev_release)(struct device *dev);
199
200 int (*suspend)(struct device *dev, pm_message_t state);
201 int (*resume)(struct device *dev);
202
203 struct dev_pm_ops *pm;
204 struct class_private *p;
205 };
206
207 struct class_dev_iter {
208 struct klist_iter ki;
209 const struct device_type *type;
210 };
211
212 extern struct kobject *sysfs_dev_block_kobj;
213 extern struct kobject *sysfs_dev_char_kobj;
214 extern int __must_check __class_register(struct class *class,
215 struct lock_class_key *key);
216 extern void class_unregister(struct class *class);
217
218 /* This is a #define to keep the compiler from merging different
219 * instances of the __key variable */
220 #define class_register(class) \
221 ({ \
222 static struct lock_class_key __key; \
223 __class_register(class, &__key); \
224 })
225
226 extern void class_dev_iter_init(struct class_dev_iter *iter,
227 struct class *class,
228 struct device *start,
229 const struct device_type *type);
230 extern struct device *class_dev_iter_next(struct class_dev_iter *iter);
231 extern void class_dev_iter_exit(struct class_dev_iter *iter);
232
233 extern int class_for_each_device(struct class *class, struct device *start,
234 void *data,
235 int (*fn)(struct device *dev, void *data));
236 extern struct device *class_find_device(struct class *class,
237 struct device *start, void *data,
238 int (*match)(struct device *, void *));
239
240 struct class_attribute {
241 struct attribute attr;
242 ssize_t (*show)(struct class *class, char *buf);
243 ssize_t (*store)(struct class *class, const char *buf, size_t count);
244 };
245
246 #define CLASS_ATTR(_name, _mode, _show, _store) \
247 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
248
249 extern int __must_check class_create_file(struct class *class,
250 const struct class_attribute *attr);
251 extern void class_remove_file(struct class *class,
252 const struct class_attribute *attr);
253
254 struct class_interface {
255 struct list_head node;
256 struct class *class;
257
258 int (*add_dev) (struct device *, struct class_interface *);
259 void (*remove_dev) (struct device *, struct class_interface *);
260 };
261
262 extern int __must_check class_interface_register(struct class_interface *);
263 extern void class_interface_unregister(struct class_interface *);
264
265 extern struct class * __must_check __class_create(struct module *owner,
266 const char *name,
267 struct lock_class_key *key);
268 extern void class_destroy(struct class *cls);
269
270 /* This is a #define to keep the compiler from merging different
271 * instances of the __key variable */
272 #define class_create(owner, name) \
273 ({ \
274 static struct lock_class_key __key; \
275 __class_create(owner, name, &__key); \
276 })
277
278 /*
279 * The type of device, "struct device" is embedded in. A class
280 * or bus can contain devices of different types
281 * like "partitions" and "disks", "mouse" and "event".
282 * This identifies the device type and carries type-specific
283 * information, equivalent to the kobj_type of a kobject.
284 * If "name" is specified, the uevent will contain it in
285 * the DEVTYPE variable.
286 */
287 struct device_type {
288 const char *name;
289 struct attribute_group **groups;
290 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
291 char *(*nodename)(struct device *dev);
292 void (*release)(struct device *dev);
293
294 struct dev_pm_ops *pm;
295 };
296
297 /* interface for exporting device attributes */
298 struct device_attribute {
299 struct attribute attr;
300 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
301 char *buf);
302 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
303 const char *buf, size_t count);
304 };
305
306 #define DEVICE_ATTR(_name, _mode, _show, _store) \
307 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
308
309 extern int __must_check device_create_file(struct device *device,
310 struct device_attribute *entry);
311 extern void device_remove_file(struct device *dev,
312 struct device_attribute *attr);
313 extern int __must_check device_create_bin_file(struct device *dev,
314 struct bin_attribute *attr);
315 extern void device_remove_bin_file(struct device *dev,
316 struct bin_attribute *attr);
317 extern int device_schedule_callback_owner(struct device *dev,
318 void (*func)(struct device *dev), struct module *owner);
319
320 /* This is a macro to avoid include problems with THIS_MODULE */
321 #define device_schedule_callback(dev, func) \
322 device_schedule_callback_owner(dev, func, THIS_MODULE)
323
324 /* device resource management */
325 typedef void (*dr_release_t)(struct device *dev, void *res);
326 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
327
328 #ifdef CONFIG_DEBUG_DEVRES
329 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
330 const char *name);
331 #define devres_alloc(release, size, gfp) \
332 __devres_alloc(release, size, gfp, #release)
333 #else
334 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
335 #endif
336 extern void devres_free(void *res);
337 extern void devres_add(struct device *dev, void *res);
338 extern void *devres_find(struct device *dev, dr_release_t release,
339 dr_match_t match, void *match_data);
340 extern void *devres_get(struct device *dev, void *new_res,
341 dr_match_t match, void *match_data);
342 extern void *devres_remove(struct device *dev, dr_release_t release,
343 dr_match_t match, void *match_data);
344 extern int devres_destroy(struct device *dev, dr_release_t release,
345 dr_match_t match, void *match_data);
346
347 /* devres group */
348 extern void * __must_check devres_open_group(struct device *dev, void *id,
349 gfp_t gfp);
350 extern void devres_close_group(struct device *dev, void *id);
351 extern void devres_remove_group(struct device *dev, void *id);
352 extern int devres_release_group(struct device *dev, void *id);
353
354 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
355 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
356 extern void devm_kfree(struct device *dev, void *p);
357
358 struct device_dma_parameters {
359 /*
360 * a low level driver may set these to teach IOMMU code about
361 * sg limitations.
362 */
363 unsigned int max_segment_size;
364 unsigned long segment_boundary_mask;
365 };
366
367 struct device {
368 struct device *parent;
369
370 struct device_private *p;
371
372 struct kobject kobj;
373 const char *init_name; /* initial name of the device */
374 struct device_type *type;
375
376 struct semaphore sem; /* semaphore to synchronize calls to
377 * its driver.
378 */
379
380 struct bus_type *bus; /* type of bus device is on */
381 struct device_driver *driver; /* which driver has allocated this
382 device */
383 void *driver_data; /* data private to the driver */
384 void *platform_data; /* Platform specific data, device
385 core doesn't touch it */
386 struct dev_pm_info power;
387
388 #ifdef CONFIG_NUMA
389 int numa_node; /* NUMA node this device is close to */
390 #endif
391 u64 *dma_mask; /* dma mask (if dma'able device) */
392 u64 coherent_dma_mask;/* Like dma_mask, but for
393 alloc_coherent mappings as
394 not all hardware supports
395 64 bit addresses for consistent
396 allocations such descriptors. */
397
398 struct device_dma_parameters *dma_parms;
399
400 struct list_head dma_pools; /* dma pools (if dma'ble) */
401
402 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
403 override */
404 /* arch specific additions */
405 struct dev_archdata archdata;
406
407 dev_t devt; /* dev_t, creates the sysfs "dev" */
408
409 spinlock_t devres_lock;
410 struct list_head devres_head;
411
412 struct klist_node knode_class;
413 struct class *class;
414 struct attribute_group **groups; /* optional groups */
415
416 void (*release)(struct device *dev);
417 };
418
419 /* Get the wakeup routines, which depend on struct device */
420 #include <linux/pm_wakeup.h>
421
422 static inline const char *dev_name(const struct device *dev)
423 {
424 return kobject_name(&dev->kobj);
425 }
426
427 extern int dev_set_name(struct device *dev, const char *name, ...)
428 __attribute__((format(printf, 2, 3)));
429
430 #ifdef CONFIG_NUMA
431 static inline int dev_to_node(struct device *dev)
432 {
433 return dev->numa_node;
434 }
435 static inline void set_dev_node(struct device *dev, int node)
436 {
437 dev->numa_node = node;
438 }
439 #else
440 static inline int dev_to_node(struct device *dev)
441 {
442 return -1;
443 }
444 static inline void set_dev_node(struct device *dev, int node)
445 {
446 }
447 #endif
448
449 static inline void *dev_get_drvdata(const struct device *dev)
450 {
451 return dev->driver_data;
452 }
453
454 static inline void dev_set_drvdata(struct device *dev, void *data)
455 {
456 dev->driver_data = data;
457 }
458
459 static inline unsigned int dev_get_uevent_suppress(const struct device *dev)
460 {
461 return dev->kobj.uevent_suppress;
462 }
463
464 static inline void dev_set_uevent_suppress(struct device *dev, int val)
465 {
466 dev->kobj.uevent_suppress = val;
467 }
468
469 static inline int device_is_registered(struct device *dev)
470 {
471 return dev->kobj.state_in_sysfs;
472 }
473
474 void driver_init(void);
475
476 /*
477 * High level routines for use by the bus drivers
478 */
479 extern int __must_check device_register(struct device *dev);
480 extern void device_unregister(struct device *dev);
481 extern void device_initialize(struct device *dev);
482 extern int __must_check device_add(struct device *dev);
483 extern void device_del(struct device *dev);
484 extern int device_for_each_child(struct device *dev, void *data,
485 int (*fn)(struct device *dev, void *data));
486 extern struct device *device_find_child(struct device *dev, void *data,
487 int (*match)(struct device *dev, void *data));
488 extern int device_rename(struct device *dev, char *new_name);
489 extern int device_move(struct device *dev, struct device *new_parent,
490 enum dpm_order dpm_order);
491 extern const char *device_get_nodename(struct device *dev, const char **tmp);
492
493 /*
494 * Root device objects for grouping under /sys/devices
495 */
496 extern struct device *__root_device_register(const char *name,
497 struct module *owner);
498 static inline struct device *root_device_register(const char *name)
499 {
500 return __root_device_register(name, THIS_MODULE);
501 }
502 extern void root_device_unregister(struct device *root);
503
504 /*
505 * Manual binding of a device to driver. See drivers/base/bus.c
506 * for information on use.
507 */
508 extern int __must_check device_bind_driver(struct device *dev);
509 extern void device_release_driver(struct device *dev);
510 extern int __must_check device_attach(struct device *dev);
511 extern int __must_check driver_attach(struct device_driver *drv);
512 extern int __must_check device_reprobe(struct device *dev);
513
514 /*
515 * Easy functions for dynamically creating devices on the fly
516 */
517 extern struct device *device_create_vargs(struct class *cls,
518 struct device *parent,
519 dev_t devt,
520 void *drvdata,
521 const char *fmt,
522 va_list vargs);
523 extern struct device *device_create(struct class *cls, struct device *parent,
524 dev_t devt, void *drvdata,
525 const char *fmt, ...)
526 __attribute__((format(printf, 5, 6)));
527 extern void device_destroy(struct class *cls, dev_t devt);
528
529 /*
530 * Platform "fixup" functions - allow the platform to have their say
531 * about devices and actions that the general device layer doesn't
532 * know about.
533 */
534 /* Notify platform of device discovery */
535 extern int (*platform_notify)(struct device *dev);
536
537 extern int (*platform_notify_remove)(struct device *dev);
538
539
540 /**
541 * get_device - atomically increment the reference count for the device.
542 *
543 */
544 extern struct device *get_device(struct device *dev);
545 extern void put_device(struct device *dev);
546
547 extern void wait_for_device_probe(void);
548
549 /* drivers/base/power/shutdown.c */
550 extern void device_shutdown(void);
551
552 /* drivers/base/sys.c */
553 extern void sysdev_shutdown(void);
554
555 /* debugging and troubleshooting/diagnostic helpers. */
556 extern const char *dev_driver_string(const struct device *dev);
557 #define dev_printk(level, dev, format, arg...) \
558 printk(level "%s %s: " format , dev_driver_string(dev) , \
559 dev_name(dev) , ## arg)
560
561 #define dev_emerg(dev, format, arg...) \
562 dev_printk(KERN_EMERG , dev , format , ## arg)
563 #define dev_alert(dev, format, arg...) \
564 dev_printk(KERN_ALERT , dev , format , ## arg)
565 #define dev_crit(dev, format, arg...) \
566 dev_printk(KERN_CRIT , dev , format , ## arg)
567 #define dev_err(dev, format, arg...) \
568 dev_printk(KERN_ERR , dev , format , ## arg)
569 #define dev_warn(dev, format, arg...) \
570 dev_printk(KERN_WARNING , dev , format , ## arg)
571 #define dev_notice(dev, format, arg...) \
572 dev_printk(KERN_NOTICE , dev , format , ## arg)
573 #define dev_info(dev, format, arg...) \
574 dev_printk(KERN_INFO , dev , format , ## arg)
575
576 #if defined(DEBUG)
577 #define dev_dbg(dev, format, arg...) \
578 dev_printk(KERN_DEBUG , dev , format , ## arg)
579 #elif defined(CONFIG_DYNAMIC_DEBUG)
580 #define dev_dbg(dev, format, ...) do { \
581 dynamic_dev_dbg(dev, format, ##__VA_ARGS__); \
582 } while (0)
583 #else
584 #define dev_dbg(dev, format, arg...) \
585 ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
586 #endif
587
588 #ifdef VERBOSE_DEBUG
589 #define dev_vdbg dev_dbg
590 #else
591
592 #define dev_vdbg(dev, format, arg...) \
593 ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
594 #endif
595
596 /*
597 * dev_WARN() acts like dev_printk(), but with the key difference
598 * of using a WARN/WARN_ON to get the message out, including the
599 * file/line information and a backtrace.
600 */
601 #define dev_WARN(dev, format, arg...) \
602 WARN(1, "Device: %s\n" format, dev_driver_string(dev), ## arg);
603
604 /* Create alias, so I can be autoloaded. */
605 #define MODULE_ALIAS_CHARDEV(major,minor) \
606 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
607 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
608 MODULE_ALIAS("char-major-" __stringify(major) "-*")
609 #endif /* _DEVICE_H_ */
610
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