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 #define DEVICE_NAME_HALF __stringify(20) /* Less than half to accommodate slop */
29 #define DEVICE_ID_SIZE 32
30 #define BUS_ID_SIZE KOBJ_NAME_LEN
39 struct bus_attribute {
40 struct attribute attr;
41 ssize_t (*show)(struct bus_type *, char * buf);
42 ssize_t (*store)(struct bus_type *, const char * buf, size_t count);
45 #define BUS_ATTR(_name,_mode,_show,_store) \
46 struct bus_attribute bus_attr_##_name = __ATTR(_name,_mode,_show,_store)
48 extern int __must_check bus_create_file(struct bus_type *,
49 struct bus_attribute *);
50 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
54 struct module * owner;
59 struct klist klist_devices;
60 struct klist klist_drivers;
62 struct blocking_notifier_head bus_notifier;
64 struct bus_attribute * bus_attrs;
65 struct device_attribute * dev_attrs;
66 struct driver_attribute * drv_attrs;
68 int (*match)(struct device * dev, struct device_driver * drv);
69 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
70 int (*probe)(struct device * dev);
71 int (*remove)(struct device * dev);
72 void (*shutdown)(struct device * dev);
74 int (*suspend)(struct device * dev, pm_message_t state);
75 int (*suspend_late)(struct device * dev, pm_message_t state);
76 int (*resume_early)(struct device * dev);
77 int (*resume)(struct device * dev);
79 unsigned int drivers_autoprobe:1;
82 extern int __must_check bus_register(struct bus_type * bus);
83 extern void bus_unregister(struct bus_type * bus);
85 extern int __must_check bus_rescan_devices(struct bus_type * bus);
87 /* iterator helpers for buses */
89 int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data,
90 int (*fn)(struct device *, void *));
91 struct device * bus_find_device(struct bus_type *bus, struct device *start,
92 void *data, int (*match)(struct device *, void *));
94 int __must_check bus_for_each_drv(struct bus_type *bus,
95 struct device_driver *start, void *data,
96 int (*fn)(struct device_driver *, void *));
99 * Bus notifiers: Get notified of addition/removal of devices
100 * and binding/unbinding of drivers to devices.
101 * In the long run, it should be a replacement for the platform
104 struct notifier_block;
106 extern int bus_register_notifier(struct bus_type *bus,
107 struct notifier_block *nb);
108 extern int bus_unregister_notifier(struct bus_type *bus,
109 struct notifier_block *nb);
111 /* All 4 notifers below get called with the target struct device *
112 * as an argument. Note that those functions are likely to be called
113 * with the device semaphore held in the core, so be careful.
115 #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
116 #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device removed */
117 #define BUS_NOTIFY_BOUND_DRIVER 0x00000003 /* driver bound to device */
118 #define BUS_NOTIFY_UNBIND_DRIVER 0x00000004 /* driver about to be
121 struct device_driver {
123 struct bus_type * bus;
126 struct klist klist_devices;
127 struct klist_node knode_bus;
129 struct module * owner;
130 const char * mod_name; /* used for built-in modules */
131 struct module_kobject * mkobj;
133 int (*probe) (struct device * dev);
134 int (*remove) (struct device * dev);
135 void (*shutdown) (struct device * dev);
136 int (*suspend) (struct device * dev, pm_message_t state);
137 int (*resume) (struct device * dev);
141 extern int __must_check driver_register(struct device_driver * drv);
142 extern void driver_unregister(struct device_driver * drv);
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, struct bus_type *bus);
147 extern int driver_probe_done(void);
149 /* sysfs interface for exporting driver attributes */
151 struct driver_attribute {
152 struct attribute attr;
153 ssize_t (*show)(struct device_driver *, char * buf);
154 ssize_t (*store)(struct device_driver *, const char * buf, size_t count);
157 #define DRIVER_ATTR(_name,_mode,_show,_store) \
158 struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store)
160 extern int __must_check driver_create_file(struct device_driver *,
161 struct driver_attribute *);
162 extern void driver_remove_file(struct device_driver *, struct driver_attribute *);
164 extern int __must_check driver_for_each_device(struct device_driver * drv,
165 struct device *start, void *data,
166 int (*fn)(struct device *, void *));
167 struct device * driver_find_device(struct device_driver *drv,
168 struct device *start, void *data,
169 int (*match)(struct device *, void *));
176 struct module * owner;
179 struct list_head children;
180 struct list_head devices;
181 struct list_head interfaces;
182 struct kset class_dirs;
183 struct semaphore sem; /* locks both the children and interfaces lists */
185 struct class_attribute * class_attrs;
186 struct class_device_attribute * class_dev_attrs;
187 struct device_attribute * dev_attrs;
189 int (*uevent)(struct class_device *dev, struct kobj_uevent_env *env);
190 int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
192 void (*release)(struct class_device *dev);
193 void (*class_release)(struct class *class);
194 void (*dev_release)(struct device *dev);
196 int (*suspend)(struct device *, pm_message_t state);
197 int (*resume)(struct device *);
200 extern int __must_check class_register(struct class *);
201 extern void class_unregister(struct class *);
204 struct class_attribute {
205 struct attribute attr;
206 ssize_t (*show)(struct class *, char * buf);
207 ssize_t (*store)(struct class *, const char * buf, size_t count);
210 #define CLASS_ATTR(_name,_mode,_show,_store) \
211 struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
213 extern int __must_check class_create_file(struct class *,
214 const struct class_attribute *);
215 extern void class_remove_file(struct class *, const struct class_attribute *);
217 struct class_device_attribute {
218 struct attribute attr;
219 ssize_t (*show)(struct class_device *, char * buf);
220 ssize_t (*store)(struct class_device *, const char * buf, size_t count);
223 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store) \
224 struct class_device_attribute class_device_attr_##_name = \
225 __ATTR(_name,_mode,_show,_store)
227 extern int __must_check class_device_create_file(struct class_device *,
228 const struct class_device_attribute *);
231 * struct class_device - class devices
232 * @class: pointer to the parent class for this class device. This is required.
233 * @devt: for internal use by the driver core only.
234 * @node: for internal use by the driver core only.
235 * @kobj: for internal use by the driver core only.
236 * @groups: optional additional groups to be created
237 * @dev: if set, a symlink to the struct device is created in the sysfs
238 * directory for this struct class device.
239 * @class_data: pointer to whatever you want to store here for this struct
240 * class_device. Use class_get_devdata() and class_set_devdata() to get and
242 * @parent: pointer to a struct class_device that is the parent of this struct
243 * class_device. If NULL, this class_device will show up at the root of the
244 * struct class in sysfs (which is probably what you want to have happen.)
245 * @release: pointer to a release function for this struct class_device. If
246 * set, this will be called instead of the class specific release function.
247 * Only use this if you want to override the default release function, like
248 * when you are nesting class_device structures.
249 * @uevent: pointer to a uevent function for this struct class_device. If
250 * set, this will be called instead of the class specific uevent function.
251 * Only use this if you want to override the default uevent function, like
252 * when you are nesting class_device structures.
254 struct class_device {
255 struct list_head node;
258 struct class * class; /* required */
259 dev_t devt; /* dev_t, creates the sysfs "dev" */
260 struct device * dev; /* not necessary, but nice to have */
261 void * class_data; /* class-specific data */
262 struct class_device *parent; /* parent of this child device, if there is one */
263 struct attribute_group ** groups; /* optional groups */
265 void (*release)(struct class_device *dev);
266 int (*uevent)(struct class_device *dev, struct kobj_uevent_env *env);
267 char class_id[BUS_ID_SIZE]; /* unique to this class */
271 class_get_devdata (struct class_device *dev)
273 return dev->class_data;
277 class_set_devdata (struct class_device *dev, void *data)
279 dev->class_data = data;
283 extern int __must_check class_device_register(struct class_device *);
284 extern void class_device_unregister(struct class_device *);
285 extern void class_device_initialize(struct class_device *);
286 extern int __must_check class_device_add(struct class_device *);
287 extern void class_device_del(struct class_device *);
289 extern struct class_device * class_device_get(struct class_device *);
290 extern void class_device_put(struct class_device *);
292 extern void class_device_remove_file(struct class_device *,
293 const struct class_device_attribute *);
294 extern int __must_check class_device_create_bin_file(struct class_device *,
295 struct bin_attribute *);
296 extern void class_device_remove_bin_file(struct class_device *,
297 struct bin_attribute *);
299 struct class_interface {
300 struct list_head node;
303 int (*add) (struct class_device *, struct class_interface *);
304 void (*remove) (struct class_device *, struct class_interface *);
305 int (*add_dev) (struct device *, struct class_interface *);
306 void (*remove_dev) (struct device *, struct class_interface *);
309 extern int __must_check class_interface_register(struct class_interface *);
310 extern void class_interface_unregister(struct class_interface *);
312 extern struct class *class_create(struct module *owner, const char *name);
313 extern void class_destroy(struct class *cls);
314 extern struct class_device *class_device_create(struct class *cls,
315 struct class_device *parent,
317 struct device *device,
318 const char *fmt, ...)
319 __attribute__((format(printf,5,6)));
320 extern void class_device_destroy(struct class *cls, dev_t devt);
323 * The type of device, "struct device" is embedded in. A class
324 * or bus can contain devices of different types
325 * like "partitions" and "disks", "mouse" and "event".
326 * This identifies the device type and carries type-specific
327 * information, equivalent to the kobj_type of a kobject.
328 * If "name" is specified, the uevent will contain it in
329 * the DEVTYPE variable.
333 struct attribute_group **groups;
334 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
335 void (*release)(struct device *dev);
336 int (*suspend)(struct device * dev, pm_message_t state);
337 int (*resume)(struct device * dev);
340 /* interface for exporting device attributes */
341 struct device_attribute {
342 struct attribute attr;
343 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
345 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
346 const char *buf, size_t count);
349 #define DEVICE_ATTR(_name,_mode,_show,_store) \
350 struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
352 extern int __must_check device_create_file(struct device *device,
353 struct device_attribute * entry);
354 extern void device_remove_file(struct device * dev, struct device_attribute * attr);
355 extern int __must_check device_create_bin_file(struct device *dev,
356 struct bin_attribute *attr);
357 extern void device_remove_bin_file(struct device *dev,
358 struct bin_attribute *attr);
359 extern int device_schedule_callback_owner(struct device *dev,
360 void (*func)(struct device *), struct module *owner);
362 /* This is a macro to avoid include problems with THIS_MODULE */
363 #define device_schedule_callback(dev, func) \
364 device_schedule_callback_owner(dev, func, THIS_MODULE)
366 /* device resource management */
367 typedef void (*dr_release_t)(struct device *dev, void *res);
368 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
370 #ifdef CONFIG_DEBUG_DEVRES
371 extern void * __devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
373 #define devres_alloc(release, size, gfp) \
374 __devres_alloc(release, size, gfp, #release)
376 extern void * devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
378 extern void devres_free(void *res);
379 extern void devres_add(struct device *dev, void *res);
380 extern void * devres_find(struct device *dev, dr_release_t release,
381 dr_match_t match, void *match_data);
382 extern void * devres_get(struct device *dev, void *new_res,
383 dr_match_t match, void *match_data);
384 extern void * devres_remove(struct device *dev, dr_release_t release,
385 dr_match_t match, void *match_data);
386 extern int devres_destroy(struct device *dev, dr_release_t release,
387 dr_match_t match, void *match_data);
390 extern void * __must_check devres_open_group(struct device *dev, void *id,
392 extern void devres_close_group(struct device *dev, void *id);
393 extern void devres_remove_group(struct device *dev, void *id);
394 extern int devres_release_group(struct device *dev, void *id);
396 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
397 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
398 extern void devm_kfree(struct device *dev, void *p);
401 struct klist klist_children;
402 struct klist_node knode_parent; /* node in sibling list */
403 struct klist_node knode_driver;
404 struct klist_node knode_bus;
405 struct device *parent;
408 char bus_id[BUS_ID_SIZE]; /* position on parent bus */
409 struct device_type *type;
410 unsigned is_registered:1;
411 unsigned uevent_suppress:1;
413 struct semaphore sem; /* semaphore to synchronize calls to
417 struct bus_type * bus; /* type of bus device is on */
418 struct device_driver *driver; /* which driver has allocated this
420 void *driver_data; /* data private to the driver */
421 void *platform_data; /* Platform specific data, device
422 core doesn't touch it */
423 struct dev_pm_info power;
426 int numa_node; /* NUMA node this device is close to */
428 u64 *dma_mask; /* dma mask (if dma'able device) */
429 u64 coherent_dma_mask;/* Like dma_mask, but for
430 alloc_coherent mappings as
431 not all hardware supports
432 64 bit addresses for consistent
433 allocations such descriptors. */
435 struct list_head dma_pools; /* dma pools (if dma'ble) */
437 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
439 /* arch specific additions */
440 struct dev_archdata archdata;
442 spinlock_t devres_lock;
443 struct list_head devres_head;
445 /* class_device migration path */
446 struct list_head node;
448 dev_t devt; /* dev_t, creates the sysfs "dev" */
449 struct attribute_group **groups; /* optional groups */
451 void (*release)(struct device * dev);
455 static inline int dev_to_node(struct device *dev)
457 return dev->numa_node;
459 static inline void set_dev_node(struct device *dev, int node)
461 dev->numa_node = node;
464 static inline int dev_to_node(struct device *dev)
468 static inline void set_dev_node(struct device *dev, int node)
474 dev_get_drvdata (struct device *dev)
476 return dev->driver_data;
480 dev_set_drvdata (struct device *dev, void *data)
482 dev->driver_data = data;
485 static inline int device_is_registered(struct device *dev)
487 return dev->is_registered;
490 void driver_init(void);
493 * High level routines for use by the bus drivers
495 extern int __must_check device_register(struct device * dev);
496 extern void device_unregister(struct device * dev);
497 extern void device_initialize(struct device * dev);
498 extern int __must_check device_add(struct device * dev);
499 extern void device_del(struct device * dev);
500 extern int device_for_each_child(struct device *, void *,
501 int (*fn)(struct device *, void *));
502 extern struct device *device_find_child(struct device *, void *data,
503 int (*match)(struct device *, void *));
504 extern int device_rename(struct device *dev, char *new_name);
505 extern int device_move(struct device *dev, struct device *new_parent);
508 * Manual binding of a device to driver. See drivers/base/bus.c
509 * for information on use.
511 extern int __must_check device_bind_driver(struct device *dev);
512 extern void device_release_driver(struct device * dev);
513 extern int __must_check device_attach(struct device * dev);
514 extern int __must_check driver_attach(struct device_driver *drv);
515 extern int __must_check device_reprobe(struct device *dev);
518 * Easy functions for dynamically creating devices on the fly
520 extern struct device *device_create(struct class *cls, struct device *parent,
521 dev_t devt, const char *fmt, ...)
522 __attribute__((format(printf,4,5)));
523 extern void device_destroy(struct class *cls, dev_t devt);
526 * Platform "fixup" functions - allow the platform to have their say
527 * about devices and actions that the general device layer doesn't
530 /* Notify platform of device discovery */
531 extern int (*platform_notify)(struct device * dev);
533 extern int (*platform_notify_remove)(struct device * dev);
537 * get_device - atomically increment the reference count for the device.
540 extern struct device * get_device(struct device * dev);
541 extern void put_device(struct device * dev);
544 /* drivers/base/power/shutdown.c */
545 extern void device_shutdown(void);
547 /* drivers/base/sys.c */
548 extern void sysdev_shutdown(void);
551 /* drivers/base/firmware.c */
552 extern int __must_check firmware_register(struct kset *);
553 extern void firmware_unregister(struct kset *);
555 /* debugging and troubleshooting/diagnostic helpers. */
556 extern const char *dev_driver_string(struct device *dev);
557 #define dev_printk(level, dev, format, arg...) \
558 printk(level "%s %s: " format , dev_driver_string(dev) , (dev)->bus_id , ## arg)
561 #define dev_dbg(dev, format, arg...) \
562 dev_printk(KERN_DEBUG , dev , format , ## arg)
564 static inline int __attribute__ ((format (printf, 2, 3)))
565 dev_dbg(struct device * dev, const char * fmt, ...)
572 #define dev_vdbg dev_dbg
574 static inline int __attribute__ ((format (printf, 2, 3)))
575 dev_vdbg(struct device * dev, const char * fmt, ...)
581 #define dev_err(dev, format, arg...) \
582 dev_printk(KERN_ERR , dev , format , ## arg)
583 #define dev_info(dev, format, arg...) \
584 dev_printk(KERN_INFO , dev , format , ## arg)
585 #define dev_warn(dev, format, arg...) \
586 dev_printk(KERN_WARNING , dev , format , ## arg)
587 #define dev_notice(dev, format, arg...) \
588 dev_printk(KERN_NOTICE , dev , format , ## arg)
590 /* Create alias, so I can be autoloaded. */
591 #define MODULE_ALIAS_CHARDEV(major,minor) \
592 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
593 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
594 MODULE_ALIAS("char-major-" __stringify(major) "-*")
595 #endif /* _DEVICE_H_ */