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, char **envp,
70 int num_envp, char *buffer, int buffer_size);
71 int (*probe)(struct device * dev);
72 int (*remove)(struct device * dev);
73 void (*shutdown)(struct device * dev);
75 int (*suspend)(struct device * dev, pm_message_t state);
76 int (*suspend_late)(struct device * dev, pm_message_t state);
77 int (*resume_early)(struct device * dev);
78 int (*resume)(struct device * dev);
80 unsigned int drivers_autoprobe:1;
83 extern int __must_check bus_register(struct bus_type * bus);
84 extern void bus_unregister(struct bus_type * bus);
86 extern int __must_check bus_rescan_devices(struct bus_type * bus);
88 /* iterator helpers for buses */
90 int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data,
91 int (*fn)(struct device *, void *));
92 struct device * bus_find_device(struct bus_type *bus, struct device *start,
93 void *data, int (*match)(struct device *, void *));
95 int __must_check bus_for_each_drv(struct bus_type *bus,
96 struct device_driver *start, void *data,
97 int (*fn)(struct device_driver *, void *));
100 * Bus notifiers: Get notified of addition/removal of devices
101 * and binding/unbinding of drivers to devices.
102 * In the long run, it should be a replacement for the platform
105 struct notifier_block;
107 extern int bus_register_notifier(struct bus_type *bus,
108 struct notifier_block *nb);
109 extern int bus_unregister_notifier(struct bus_type *bus,
110 struct notifier_block *nb);
112 /* All 4 notifers below get called with the target struct device *
113 * as an argument. Note that those functions are likely to be called
114 * with the device semaphore held in the core, so be careful.
116 #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
117 #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device removed */
118 #define BUS_NOTIFY_BOUND_DRIVER 0x00000003 /* driver bound to device */
119 #define BUS_NOTIFY_UNBIND_DRIVER 0x00000004 /* driver about to be
122 struct device_driver {
124 struct bus_type * bus;
127 struct klist klist_devices;
128 struct klist_node knode_bus;
130 struct module * owner;
131 const char * mod_name; /* used for built-in modules */
132 struct module_kobject * mkobj;
134 int (*probe) (struct device * dev);
135 int (*remove) (struct device * dev);
136 void (*shutdown) (struct device * dev);
137 int (*suspend) (struct device * dev, pm_message_t state);
138 int (*resume) (struct device * dev);
142 extern int __must_check driver_register(struct device_driver * drv);
143 extern void driver_unregister(struct device_driver * drv);
145 extern struct device_driver * get_driver(struct device_driver * drv);
146 extern void put_driver(struct device_driver * drv);
147 extern struct device_driver *driver_find(const char *name, struct bus_type *bus);
148 extern int driver_probe_done(void);
150 /* sysfs interface for exporting driver attributes */
152 struct driver_attribute {
153 struct attribute attr;
154 ssize_t (*show)(struct device_driver *, char * buf);
155 ssize_t (*store)(struct device_driver *, const char * buf, size_t count);
158 #define DRIVER_ATTR(_name,_mode,_show,_store) \
159 struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store)
161 extern int __must_check driver_create_file(struct device_driver *,
162 struct driver_attribute *);
163 extern void driver_remove_file(struct device_driver *, struct driver_attribute *);
165 extern int __must_check driver_for_each_device(struct device_driver * drv,
166 struct device *start, void *data,
167 int (*fn)(struct device *, void *));
168 struct device * driver_find_device(struct device_driver *drv,
169 struct device *start, void *data,
170 int (*match)(struct device *, void *));
177 struct module * owner;
180 struct list_head children;
181 struct list_head devices;
182 struct list_head interfaces;
183 struct kset class_dirs;
184 struct semaphore sem; /* locks both the children and interfaces lists */
186 struct class_attribute * class_attrs;
187 struct class_device_attribute * class_dev_attrs;
188 struct device_attribute * dev_attrs;
190 int (*uevent)(struct class_device *dev, char **envp,
191 int num_envp, char *buffer, int buffer_size);
192 int (*dev_uevent)(struct device *dev, char **envp, int num_envp,
193 char *buffer, int buffer_size);
195 void (*release)(struct class_device *dev);
196 void (*class_release)(struct class *class);
197 void (*dev_release)(struct device *dev);
199 int (*suspend)(struct device *, pm_message_t state);
200 int (*resume)(struct device *);
203 extern int __must_check class_register(struct class *);
204 extern void class_unregister(struct class *);
207 struct class_attribute {
208 struct attribute attr;
209 ssize_t (*show)(struct class *, char * buf);
210 ssize_t (*store)(struct class *, const char * buf, size_t count);
213 #define CLASS_ATTR(_name,_mode,_show,_store) \
214 struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
216 extern int __must_check class_create_file(struct class *,
217 const struct class_attribute *);
218 extern void class_remove_file(struct class *, const struct class_attribute *);
220 struct class_device_attribute {
221 struct attribute attr;
222 ssize_t (*show)(struct class_device *, char * buf);
223 ssize_t (*store)(struct class_device *, const char * buf, size_t count);
226 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store) \
227 struct class_device_attribute class_device_attr_##_name = \
228 __ATTR(_name,_mode,_show,_store)
230 extern int __must_check class_device_create_file(struct class_device *,
231 const struct class_device_attribute *);
234 * struct class_device - class devices
235 * @class: pointer to the parent class for this class device. This is required.
236 * @devt: for internal use by the driver core only.
237 * @node: for internal use by the driver core only.
238 * @kobj: for internal use by the driver core only.
239 * @groups: optional additional groups to be created
240 * @dev: if set, a symlink to the struct device is created in the sysfs
241 * directory for this struct class device.
242 * @class_data: pointer to whatever you want to store here for this struct
243 * class_device. Use class_get_devdata() and class_set_devdata() to get and
245 * @parent: pointer to a struct class_device that is the parent of this struct
246 * class_device. If NULL, this class_device will show up at the root of the
247 * struct class in sysfs (which is probably what you want to have happen.)
248 * @release: pointer to a release function for this struct class_device. If
249 * set, this will be called instead of the class specific release function.
250 * Only use this if you want to override the default release function, like
251 * when you are nesting class_device structures.
252 * @uevent: pointer to a uevent function for this struct class_device. If
253 * set, this will be called instead of the class specific uevent function.
254 * Only use this if you want to override the default uevent function, like
255 * when you are nesting class_device structures.
257 struct class_device {
258 struct list_head node;
261 struct class * class; /* required */
262 dev_t devt; /* dev_t, creates the sysfs "dev" */
263 struct device * dev; /* not necessary, but nice to have */
264 void * class_data; /* class-specific data */
265 struct class_device *parent; /* parent of this child device, if there is one */
266 struct attribute_group ** groups; /* optional groups */
268 void (*release)(struct class_device *dev);
269 int (*uevent)(struct class_device *dev, char **envp,
270 int num_envp, char *buffer, int buffer_size);
271 char class_id[BUS_ID_SIZE]; /* unique to this class */
275 class_get_devdata (struct class_device *dev)
277 return dev->class_data;
281 class_set_devdata (struct class_device *dev, void *data)
283 dev->class_data = data;
287 extern int __must_check class_device_register(struct class_device *);
288 extern void class_device_unregister(struct class_device *);
289 extern void class_device_initialize(struct class_device *);
290 extern int __must_check class_device_add(struct class_device *);
291 extern void class_device_del(struct class_device *);
293 extern struct class_device * class_device_get(struct class_device *);
294 extern void class_device_put(struct class_device *);
296 extern void class_device_remove_file(struct class_device *,
297 const struct class_device_attribute *);
298 extern int __must_check class_device_create_bin_file(struct class_device *,
299 struct bin_attribute *);
300 extern void class_device_remove_bin_file(struct class_device *,
301 struct bin_attribute *);
303 struct class_interface {
304 struct list_head node;
307 int (*add) (struct class_device *, struct class_interface *);
308 void (*remove) (struct class_device *, struct class_interface *);
309 int (*add_dev) (struct device *, struct class_interface *);
310 void (*remove_dev) (struct device *, struct class_interface *);
313 extern int __must_check class_interface_register(struct class_interface *);
314 extern void class_interface_unregister(struct class_interface *);
316 extern struct class *class_create(struct module *owner, const char *name);
317 extern void class_destroy(struct class *cls);
318 extern struct class_device *class_device_create(struct class *cls,
319 struct class_device *parent,
321 struct device *device,
322 const char *fmt, ...)
323 __attribute__((format(printf,5,6)));
324 extern void class_device_destroy(struct class *cls, dev_t devt);
327 * The type of device, "struct device" is embedded in. A class
328 * or bus can contain devices of different types
329 * like "partitions" and "disks", "mouse" and "event".
330 * This identifies the device type and carries type-specific
331 * information, equivalent to the kobj_type of a kobject.
332 * If "name" is specified, the uevent will contain it in
333 * the DEVTYPE variable.
337 struct attribute_group **groups;
338 int (*uevent)(struct device *dev, char **envp, int num_envp,
339 char *buffer, int buffer_size);
340 void (*release)(struct device *dev);
341 int (*suspend)(struct device * dev, pm_message_t state);
342 int (*resume)(struct device * dev);
345 /* interface for exporting device attributes */
346 struct device_attribute {
347 struct attribute attr;
348 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
350 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
351 const char *buf, size_t count);
354 #define DEVICE_ATTR(_name,_mode,_show,_store) \
355 struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
357 extern int __must_check device_create_file(struct device *device,
358 struct device_attribute * entry);
359 extern void device_remove_file(struct device * dev, struct device_attribute * attr);
360 extern int __must_check device_create_bin_file(struct device *dev,
361 struct bin_attribute *attr);
362 extern void device_remove_bin_file(struct device *dev,
363 struct bin_attribute *attr);
364 extern int device_schedule_callback_owner(struct device *dev,
365 void (*func)(struct device *), struct module *owner);
367 /* This is a macro to avoid include problems with THIS_MODULE */
368 #define device_schedule_callback(dev, func) \
369 device_schedule_callback_owner(dev, func, THIS_MODULE)
371 /* device resource management */
372 typedef void (*dr_release_t)(struct device *dev, void *res);
373 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
375 #ifdef CONFIG_DEBUG_DEVRES
376 extern void * __devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
378 #define devres_alloc(release, size, gfp) \
379 __devres_alloc(release, size, gfp, #release)
381 extern void * devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
383 extern void devres_free(void *res);
384 extern void devres_add(struct device *dev, void *res);
385 extern void * devres_find(struct device *dev, dr_release_t release,
386 dr_match_t match, void *match_data);
387 extern void * devres_get(struct device *dev, void *new_res,
388 dr_match_t match, void *match_data);
389 extern void * devres_remove(struct device *dev, dr_release_t release,
390 dr_match_t match, void *match_data);
391 extern int devres_destroy(struct device *dev, dr_release_t release,
392 dr_match_t match, void *match_data);
395 extern void * __must_check devres_open_group(struct device *dev, void *id,
397 extern void devres_close_group(struct device *dev, void *id);
398 extern void devres_remove_group(struct device *dev, void *id);
399 extern int devres_release_group(struct device *dev, void *id);
401 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
402 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
403 extern void devm_kfree(struct device *dev, void *p);
406 struct klist klist_children;
407 struct klist_node knode_parent; /* node in sibling list */
408 struct klist_node knode_driver;
409 struct klist_node knode_bus;
410 struct device *parent;
413 char bus_id[BUS_ID_SIZE]; /* position on parent bus */
414 struct device_type *type;
415 unsigned is_registered:1;
416 unsigned uevent_suppress:1;
418 struct semaphore sem; /* semaphore to synchronize calls to
422 struct bus_type * bus; /* type of bus device is on */
423 struct device_driver *driver; /* which driver has allocated this
425 void *driver_data; /* data private to the driver */
426 void *platform_data; /* Platform specific data, device
427 core doesn't touch it */
428 struct dev_pm_info power;
431 int numa_node; /* NUMA node this device is close to */
433 u64 *dma_mask; /* dma mask (if dma'able device) */
434 u64 coherent_dma_mask;/* Like dma_mask, but for
435 alloc_coherent mappings as
436 not all hardware supports
437 64 bit addresses for consistent
438 allocations such descriptors. */
440 struct list_head dma_pools; /* dma pools (if dma'ble) */
442 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
444 /* arch specific additions */
445 struct dev_archdata archdata;
447 spinlock_t devres_lock;
448 struct list_head devres_head;
450 /* class_device migration path */
451 struct list_head node;
453 dev_t devt; /* dev_t, creates the sysfs "dev" */
454 struct attribute_group **groups; /* optional groups */
456 void (*release)(struct device * dev);
460 static inline int dev_to_node(struct device *dev)
462 return dev->numa_node;
464 static inline void set_dev_node(struct device *dev, int node)
466 dev->numa_node = node;
469 static inline int dev_to_node(struct device *dev)
473 static inline void set_dev_node(struct device *dev, int node)
479 dev_get_drvdata (struct device *dev)
481 return dev->driver_data;
485 dev_set_drvdata (struct device *dev, void *data)
487 dev->driver_data = data;
490 static inline int device_is_registered(struct device *dev)
492 return dev->is_registered;
495 void driver_init(void);
498 * High level routines for use by the bus drivers
500 extern int __must_check device_register(struct device * dev);
501 extern void device_unregister(struct device * dev);
502 extern void device_initialize(struct device * dev);
503 extern int __must_check device_add(struct device * dev);
504 extern void device_del(struct device * dev);
505 extern int device_for_each_child(struct device *, void *,
506 int (*fn)(struct device *, void *));
507 extern struct device *device_find_child(struct device *, void *data,
508 int (*match)(struct device *, void *));
509 extern int device_rename(struct device *dev, char *new_name);
510 extern int device_move(struct device *dev, struct device *new_parent);
513 * Manual binding of a device to driver. See drivers/base/bus.c
514 * for information on use.
516 extern int __must_check device_bind_driver(struct device *dev);
517 extern void device_release_driver(struct device * dev);
518 extern int __must_check device_attach(struct device * dev);
519 extern int __must_check driver_attach(struct device_driver *drv);
520 extern int __must_check device_reprobe(struct device *dev);
523 * Easy functions for dynamically creating devices on the fly
525 extern struct device *device_create(struct class *cls, struct device *parent,
526 dev_t devt, const char *fmt, ...)
527 __attribute__((format(printf,4,5)));
528 extern void device_destroy(struct class *cls, dev_t devt);
531 * Platform "fixup" functions - allow the platform to have their say
532 * about devices and actions that the general device layer doesn't
535 /* Notify platform of device discovery */
536 extern int (*platform_notify)(struct device * dev);
538 extern int (*platform_notify_remove)(struct device * dev);
542 * get_device - atomically increment the reference count for the device.
545 extern struct device * get_device(struct device * dev);
546 extern void put_device(struct device * dev);
549 /* drivers/base/power/shutdown.c */
550 extern void device_shutdown(void);
552 /* drivers/base/sys.c */
553 extern void sysdev_shutdown(void);
556 /* drivers/base/firmware.c */
557 extern int __must_check firmware_register(struct kset *);
558 extern void firmware_unregister(struct kset *);
560 /* debugging and troubleshooting/diagnostic helpers. */
561 extern const char *dev_driver_string(struct device *dev);
562 #define dev_printk(level, dev, format, arg...) \
563 printk(level "%s %s: " format , dev_driver_string(dev) , (dev)->bus_id , ## arg)
566 #define dev_dbg(dev, format, arg...) \
567 dev_printk(KERN_DEBUG , dev , format , ## arg)
569 static inline int __attribute__ ((format (printf, 2, 3)))
570 dev_dbg(struct device * dev, const char * fmt, ...)
577 #define dev_vdbg dev_dbg
579 static inline int __attribute__ ((format (printf, 2, 3)))
580 dev_vdbg(struct device * dev, const char * fmt, ...)
586 #define dev_err(dev, format, arg...) \
587 dev_printk(KERN_ERR , dev , format , ## arg)
588 #define dev_info(dev, format, arg...) \
589 dev_printk(KERN_INFO , dev , format , ## arg)
590 #define dev_warn(dev, format, arg...) \
591 dev_printk(KERN_WARNING , dev , format , ## arg)
592 #define dev_notice(dev, format, arg...) \
593 dev_printk(KERN_NOTICE , dev , format , ## arg)
595 /* Create alias, so I can be autoloaded. */
596 #define MODULE_ALIAS_CHARDEV(major,minor) \
597 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
598 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
599 MODULE_ALIAS("char-major-" __stringify(major) "-*")
600 #endif /* _DEVICE_H_ */