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/compiler.h>
20 #include <linux/types.h>
21 #include <linux/module.h>
23 #include <asm/semaphore.h>
24 #include <asm/atomic.h>
25 #include <asm/device.h>
27 #define DEVICE_NAME_SIZE 50
28 /* DEVICE_NAME_HALF is really less than half to accommodate slop */
29 #define DEVICE_NAME_HALF __stringify(20)
30 #define DEVICE_ID_SIZE 32
31 #define BUS_ID_SIZE KOBJ_NAME_LEN
36 struct driver_private;
40 struct bus_type_private;
42 struct bus_attribute {
43 struct attribute attr;
44 ssize_t (*show)(struct bus_type *bus, char *buf);
45 ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
48 #define BUS_ATTR(_name, _mode, _show, _store) \
49 struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
51 extern int __must_check bus_create_file(struct bus_type *,
52 struct bus_attribute *);
53 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
57 struct bus_attribute *bus_attrs;
58 struct device_attribute *dev_attrs;
59 struct driver_attribute *drv_attrs;
61 int (*match)(struct device *dev, struct device_driver *drv);
62 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
63 int (*probe)(struct device *dev);
64 int (*remove)(struct device *dev);
65 void (*shutdown)(struct device *dev);
67 int (*suspend)(struct device *dev, pm_message_t state);
68 int (*suspend_late)(struct device *dev, pm_message_t state);
69 int (*resume_early)(struct device *dev);
70 int (*resume)(struct device *dev);
72 struct bus_type_private *p;
75 extern int __must_check bus_register(struct bus_type *bus);
76 extern void bus_unregister(struct bus_type *bus);
78 extern int __must_check bus_rescan_devices(struct bus_type *bus);
80 /* iterator helpers for buses */
82 int bus_for_each_dev(struct bus_type *bus, struct device *start, void *data,
83 int (*fn)(struct device *dev, void *data));
84 struct device *bus_find_device(struct bus_type *bus, struct device *start,
86 int (*match)(struct device *dev, void *data));
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 *));
93 * Bus notifiers: Get notified of addition/removal of devices
94 * and binding/unbinding of drivers to devices.
95 * In the long run, it should be a replacement for the platform
98 struct notifier_block;
100 extern int bus_register_notifier(struct bus_type *bus,
101 struct notifier_block *nb);
102 extern int bus_unregister_notifier(struct bus_type *bus,
103 struct notifier_block *nb);
105 /* All 4 notifers below get called with the target struct device *
106 * as an argument. Note that those functions are likely to be called
107 * with the device semaphore held in the core, so be careful.
109 #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
110 #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device removed */
111 #define BUS_NOTIFY_BOUND_DRIVER 0x00000003 /* driver bound to device */
112 #define BUS_NOTIFY_UNBIND_DRIVER 0x00000004 /* driver about to be
115 extern struct kset *bus_get_kset(struct bus_type *bus);
116 extern struct klist *bus_get_device_klist(struct bus_type *bus);
118 struct device_driver {
120 struct bus_type *bus;
122 struct module *owner;
123 const char *mod_name; /* used for built-in modules */
125 int (*probe) (struct device *dev);
126 int (*remove) (struct device *dev);
127 void (*shutdown) (struct device *dev);
128 int (*suspend) (struct device *dev, pm_message_t state);
129 int (*resume) (struct device *dev);
130 struct attribute_group **groups;
132 struct driver_private *p;
136 extern int __must_check driver_register(struct device_driver *drv);
137 extern void driver_unregister(struct device_driver *drv);
139 extern struct device_driver *get_driver(struct device_driver *drv);
140 extern void put_driver(struct device_driver *drv);
141 extern struct device_driver *driver_find(const char *name,
142 struct bus_type *bus);
143 extern int driver_probe_done(void);
145 /* sysfs interface for exporting driver attributes */
147 struct driver_attribute {
148 struct attribute attr;
149 ssize_t (*show)(struct device_driver *driver, char *buf);
150 ssize_t (*store)(struct device_driver *driver, const char *buf,
154 #define DRIVER_ATTR(_name, _mode, _show, _store) \
155 struct driver_attribute driver_attr_##_name = \
156 __ATTR(_name, _mode, _show, _store)
158 extern int __must_check driver_create_file(struct device_driver *driver,
159 struct driver_attribute *attr);
160 extern void driver_remove_file(struct device_driver *driver,
161 struct driver_attribute *attr);
163 extern int __must_check driver_add_kobj(struct device_driver *drv,
164 struct kobject *kobj,
165 const char *fmt, ...);
167 extern int __must_check driver_for_each_device(struct device_driver *drv,
168 struct device *start,
170 int (*fn)(struct device *dev,
172 struct device *driver_find_device(struct device_driver *drv,
173 struct device *start, void *data,
174 int (*match)(struct device *dev, void *data));
181 struct module *owner;
184 struct list_head children;
185 struct list_head devices;
186 struct list_head interfaces;
187 struct kset class_dirs;
188 struct semaphore sem; /* locks children, devices, interfaces */
189 struct class_attribute *class_attrs;
190 struct class_device_attribute *class_dev_attrs;
191 struct device_attribute *dev_attrs;
193 int (*uevent)(struct class_device *dev, struct kobj_uevent_env *env);
194 int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
196 void (*release)(struct class_device *dev);
197 void (*class_release)(struct class *class);
198 void (*dev_release)(struct device *dev);
200 int (*suspend)(struct device *dev, pm_message_t state);
201 int (*resume)(struct device *dev);
204 extern int __must_check class_register(struct class *class);
205 extern void class_unregister(struct class *class);
206 extern int class_for_each_device(struct class *class, void *data,
207 int (*fn)(struct device *dev, void *data));
208 extern struct device *class_find_device(struct class *class, void *data,
209 int (*match)(struct device *, void *));
210 extern struct class_device *class_find_child(struct class *class, void *data,
211 int (*match)(struct class_device *, void *));
214 struct class_attribute {
215 struct attribute attr;
216 ssize_t (*show)(struct class *class, char *buf);
217 ssize_t (*store)(struct class *class, const char *buf, size_t count);
220 #define CLASS_ATTR(_name, _mode, _show, _store) \
221 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
223 extern int __must_check class_create_file(struct class *class,
224 const struct class_attribute *attr);
225 extern void class_remove_file(struct class *class,
226 const struct class_attribute *attr);
228 struct class_device_attribute {
229 struct attribute attr;
230 ssize_t (*show)(struct class_device *, char *buf);
231 ssize_t (*store)(struct class_device *, const char *buf, size_t count);
234 #define CLASS_DEVICE_ATTR(_name, _mode, _show, _store) \
235 struct class_device_attribute class_device_attr_##_name = \
236 __ATTR(_name, _mode, _show, _store)
238 extern int __must_check class_device_create_file(struct class_device *,
239 const struct class_device_attribute *);
242 * struct class_device - class devices
243 * @class: pointer to the parent class for this class device. This is required.
244 * @devt: for internal use by the driver core only.
245 * @node: for internal use by the driver core only.
246 * @kobj: for internal use by the driver core only.
247 * @groups: optional additional groups to be created
248 * @dev: if set, a symlink to the struct device is created in the sysfs
249 * directory for this struct class device.
250 * @class_data: pointer to whatever you want to store here for this struct
251 * class_device. Use class_get_devdata() and class_set_devdata() to get and
253 * @parent: pointer to a struct class_device that is the parent of this struct
254 * class_device. If NULL, this class_device will show up at the root of the
255 * struct class in sysfs (which is probably what you want to have happen.)
256 * @release: pointer to a release function for this struct class_device. If
257 * set, this will be called instead of the class specific release function.
258 * Only use this if you want to override the default release function, like
259 * when you are nesting class_device structures.
260 * @uevent: pointer to a uevent function for this struct class_device. If
261 * set, this will be called instead of the class specific uevent function.
262 * Only use this if you want to override the default uevent function, like
263 * when you are nesting class_device structures.
265 struct class_device {
266 struct list_head node;
273 struct class_device *parent;
274 struct attribute_group **groups;
276 void (*release)(struct class_device *dev);
277 int (*uevent)(struct class_device *dev, struct kobj_uevent_env *env);
278 char class_id[BUS_ID_SIZE];
281 static inline void *class_get_devdata(struct class_device *dev)
283 return dev->class_data;
286 static inline void class_set_devdata(struct class_device *dev, void *data)
288 dev->class_data = data;
292 extern int __must_check class_device_register(struct class_device *);
293 extern void class_device_unregister(struct class_device *);
294 extern void class_device_initialize(struct class_device *);
295 extern int __must_check class_device_add(struct class_device *);
296 extern void class_device_del(struct class_device *);
298 extern struct class_device *class_device_get(struct class_device *);
299 extern void class_device_put(struct class_device *);
301 extern void class_device_remove_file(struct class_device *,
302 const struct class_device_attribute *);
303 extern int __must_check class_device_create_bin_file(struct class_device *,
304 struct bin_attribute *);
305 extern void class_device_remove_bin_file(struct class_device *,
306 struct bin_attribute *);
308 struct class_interface {
309 struct list_head node;
312 int (*add) (struct class_device *, struct class_interface *);
313 void (*remove) (struct class_device *, struct class_interface *);
314 int (*add_dev) (struct device *, struct class_interface *);
315 void (*remove_dev) (struct device *, struct class_interface *);
318 extern int __must_check class_interface_register(struct class_interface *);
319 extern void class_interface_unregister(struct class_interface *);
321 extern struct class *class_create(struct module *owner, const char *name);
322 extern void class_destroy(struct class *cls);
323 extern struct class_device *class_device_create(struct class *cls,
324 struct class_device *parent,
326 struct device *device,
327 const char *fmt, ...)
328 __attribute__((format(printf, 5, 6)));
329 extern void class_device_destroy(struct class *cls, dev_t devt);
332 * The type of device, "struct device" is embedded in. A class
333 * or bus can contain devices of different types
334 * like "partitions" and "disks", "mouse" and "event".
335 * This identifies the device type and carries type-specific
336 * information, equivalent to the kobj_type of a kobject.
337 * If "name" is specified, the uevent will contain it in
338 * the DEVTYPE variable.
342 struct attribute_group **groups;
343 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
344 void (*release)(struct device *dev);
345 int (*suspend)(struct device *dev, pm_message_t state);
346 int (*resume)(struct device *dev);
349 /* interface for exporting device attributes */
350 struct device_attribute {
351 struct attribute attr;
352 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
354 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
355 const char *buf, size_t count);
358 #define DEVICE_ATTR(_name, _mode, _show, _store) \
359 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
361 extern int __must_check device_create_file(struct device *device,
362 struct device_attribute *entry);
363 extern void device_remove_file(struct device *dev,
364 struct device_attribute *attr);
365 extern int __must_check device_create_bin_file(struct device *dev,
366 struct bin_attribute *attr);
367 extern void device_remove_bin_file(struct device *dev,
368 struct bin_attribute *attr);
369 extern int device_schedule_callback_owner(struct device *dev,
370 void (*func)(struct device *dev), struct module *owner);
372 /* This is a macro to avoid include problems with THIS_MODULE */
373 #define device_schedule_callback(dev, func) \
374 device_schedule_callback_owner(dev, func, THIS_MODULE)
376 /* device resource management */
377 typedef void (*dr_release_t)(struct device *dev, void *res);
378 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
380 #ifdef CONFIG_DEBUG_DEVRES
381 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
383 #define devres_alloc(release, size, gfp) \
384 __devres_alloc(release, size, gfp, #release)
386 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
388 extern void devres_free(void *res);
389 extern void devres_add(struct device *dev, void *res);
390 extern void *devres_find(struct device *dev, dr_release_t release,
391 dr_match_t match, void *match_data);
392 extern void *devres_get(struct device *dev, void *new_res,
393 dr_match_t match, void *match_data);
394 extern void *devres_remove(struct device *dev, dr_release_t release,
395 dr_match_t match, void *match_data);
396 extern int devres_destroy(struct device *dev, dr_release_t release,
397 dr_match_t match, void *match_data);
400 extern void * __must_check devres_open_group(struct device *dev, void *id,
402 extern void devres_close_group(struct device *dev, void *id);
403 extern void devres_remove_group(struct device *dev, void *id);
404 extern int devres_release_group(struct device *dev, void *id);
406 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
407 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
408 extern void devm_kfree(struct device *dev, void *p);
411 struct klist klist_children;
412 struct klist_node knode_parent; /* node in sibling list */
413 struct klist_node knode_driver;
414 struct klist_node knode_bus;
415 struct device *parent;
418 char bus_id[BUS_ID_SIZE]; /* position on parent bus */
419 struct device_type *type;
420 unsigned is_registered:1;
421 unsigned uevent_suppress:1;
423 struct semaphore sem; /* semaphore to synchronize calls to
427 struct bus_type *bus; /* type of bus device is on */
428 struct device_driver *driver; /* which driver has allocated this
430 void *driver_data; /* data private to the driver */
431 void *platform_data; /* Platform specific data, device
432 core doesn't touch it */
433 struct dev_pm_info power;
436 int numa_node; /* NUMA node this device is close to */
438 u64 *dma_mask; /* dma mask (if dma'able device) */
439 u64 coherent_dma_mask;/* Like dma_mask, but for
440 alloc_coherent mappings as
441 not all hardware supports
442 64 bit addresses for consistent
443 allocations such descriptors. */
445 struct list_head dma_pools; /* dma pools (if dma'ble) */
447 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
449 /* arch specific additions */
450 struct dev_archdata archdata;
452 spinlock_t devres_lock;
453 struct list_head devres_head;
455 /* class_device migration path */
456 struct list_head node;
458 dev_t devt; /* dev_t, creates the sysfs "dev" */
459 struct attribute_group **groups; /* optional groups */
461 void (*release)(struct device *dev);
465 static inline int dev_to_node(struct device *dev)
467 return dev->numa_node;
469 static inline void set_dev_node(struct device *dev, int node)
471 dev->numa_node = node;
474 static inline int dev_to_node(struct device *dev)
478 static inline void set_dev_node(struct device *dev, int node)
483 static inline void *dev_get_drvdata(struct device *dev)
485 return dev->driver_data;
488 static inline void dev_set_drvdata(struct device *dev, void *data)
490 dev->driver_data = data;
493 static inline int device_is_registered(struct device *dev)
495 return dev->is_registered;
498 void driver_init(void);
501 * High level routines for use by the bus drivers
503 extern int __must_check device_register(struct device *dev);
504 extern void device_unregister(struct device *dev);
505 extern void device_initialize(struct device *dev);
506 extern int __must_check device_add(struct device *dev);
507 extern void device_del(struct device *dev);
508 extern int device_for_each_child(struct device *dev, void *data,
509 int (*fn)(struct device *dev, void *data));
510 extern struct device *device_find_child(struct device *dev, void *data,
511 int (*match)(struct device *dev, void *data));
512 extern int device_rename(struct device *dev, char *new_name);
513 extern int device_move(struct device *dev, struct device *new_parent);
516 * Manual binding of a device to driver. See drivers/base/bus.c
517 * for information on use.
519 extern int __must_check device_bind_driver(struct device *dev);
520 extern void device_release_driver(struct device *dev);
521 extern int __must_check device_attach(struct device *dev);
522 extern int __must_check driver_attach(struct device_driver *drv);
523 extern int __must_check device_reprobe(struct device *dev);
526 * Easy functions for dynamically creating devices on the fly
528 extern struct device *device_create(struct class *cls, struct device *parent,
529 dev_t devt, const char *fmt, ...)
530 __attribute__((format(printf, 4, 5)));
531 extern void device_destroy(struct class *cls, dev_t devt);
532 #ifdef CONFIG_PM_SLEEP
533 extern void destroy_suspended_device(struct class *cls, dev_t devt);
534 #else /* !CONFIG_PM_SLEEP */
535 static inline void destroy_suspended_device(struct class *cls, dev_t devt)
537 device_destroy(cls, devt);
539 #endif /* !CONFIG_PM_SLEEP */
542 * Platform "fixup" functions - allow the platform to have their say
543 * about devices and actions that the general device layer doesn't
546 /* Notify platform of device discovery */
547 extern int (*platform_notify)(struct device *dev);
549 extern int (*platform_notify_remove)(struct device *dev);
553 * get_device - atomically increment the reference count for the device.
556 extern struct device *get_device(struct device *dev);
557 extern void put_device(struct device *dev);
560 /* drivers/base/power/shutdown.c */
561 extern void device_shutdown(void);
563 /* drivers/base/sys.c */
564 extern void sysdev_shutdown(void);
566 /* debugging and troubleshooting/diagnostic helpers. */
567 extern const char *dev_driver_string(struct device *dev);
568 #define dev_printk(level, dev, format, arg...) \
569 printk(level "%s %s: " format , dev_driver_string(dev) , \
570 (dev)->bus_id , ## arg)
572 #define dev_emerg(dev, format, arg...) \
573 dev_printk(KERN_EMERG , dev , format , ## arg)
574 #define dev_alert(dev, format, arg...) \
575 dev_printk(KERN_ALERT , dev , format , ## arg)
576 #define dev_crit(dev, format, arg...) \
577 dev_printk(KERN_CRIT , dev , format , ## arg)
578 #define dev_err(dev, format, arg...) \
579 dev_printk(KERN_ERR , dev , format , ## arg)
580 #define dev_warn(dev, format, arg...) \
581 dev_printk(KERN_WARNING , dev , format , ## arg)
582 #define dev_notice(dev, format, arg...) \
583 dev_printk(KERN_NOTICE , dev , format , ## arg)
584 #define dev_info(dev, format, arg...) \
585 dev_printk(KERN_INFO , dev , format , ## arg)
588 #define dev_dbg(dev, format, arg...) \
589 dev_printk(KERN_DEBUG , dev , format , ## arg)
591 static inline int __attribute__ ((format (printf, 2, 3)))
592 dev_dbg(struct device *dev, const char *fmt, ...)
599 #define dev_vdbg dev_dbg
601 static inline int __attribute__ ((format (printf, 2, 3)))
602 dev_vdbg(struct device *dev, const char *fmt, ...)
608 /* Create alias, so I can be autoloaded. */
609 #define MODULE_ALIAS_CHARDEV(major,minor) \
610 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
611 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
612 MODULE_ALIAS("char-major-" __stringify(major) "-*")
613 #endif /* _DEVICE_H_ */