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;
67 struct bus_attribute drivers_autoprobe_attr;
68 struct bus_attribute drivers_probe_attr;
70 int (*match)(struct device * dev, struct device_driver * drv);
71 int (*uevent)(struct device *dev, char **envp,
72 int num_envp, char *buffer, int buffer_size);
73 int (*probe)(struct device * dev);
74 int (*remove)(struct device * dev);
75 void (*shutdown)(struct device * dev);
77 int (*suspend)(struct device * dev, pm_message_t state);
78 int (*suspend_late)(struct device * dev, pm_message_t state);
79 int (*resume_early)(struct device * dev);
80 int (*resume)(struct device * dev);
82 unsigned int drivers_autoprobe:1;
85 extern int __must_check bus_register(struct bus_type * bus);
86 extern void bus_unregister(struct bus_type * bus);
88 extern int __must_check bus_rescan_devices(struct bus_type * bus);
90 /* iterator helpers for buses */
92 int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data,
93 int (*fn)(struct device *, void *));
94 struct device * bus_find_device(struct bus_type *bus, struct device *start,
95 void *data, int (*match)(struct device *, void *));
97 int __must_check bus_for_each_drv(struct bus_type *bus,
98 struct device_driver *start, void *data,
99 int (*fn)(struct device_driver *, void *));
102 * Bus notifiers: Get notified of addition/removal of devices
103 * and binding/unbinding of drivers to devices.
104 * In the long run, it should be a replacement for the platform
107 struct notifier_block;
109 extern int bus_register_notifier(struct bus_type *bus,
110 struct notifier_block *nb);
111 extern int bus_unregister_notifier(struct bus_type *bus,
112 struct notifier_block *nb);
114 /* All 4 notifers below get called with the target struct device *
115 * as an argument. Note that those functions are likely to be called
116 * with the device semaphore held in the core, so be careful.
118 #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
119 #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device removed */
120 #define BUS_NOTIFY_BOUND_DRIVER 0x00000003 /* driver bound to device */
121 #define BUS_NOTIFY_UNBIND_DRIVER 0x00000004 /* driver about to be
124 struct device_driver {
126 struct bus_type * bus;
129 struct klist klist_devices;
130 struct klist_node knode_bus;
132 struct module * owner;
133 const char * mod_name; /* used for built-in modules */
134 struct module_kobject * mkobj;
136 int (*probe) (struct device * dev);
137 int (*remove) (struct device * dev);
138 void (*shutdown) (struct device * dev);
139 int (*suspend) (struct device * dev, pm_message_t state);
140 int (*resume) (struct device * dev);
144 extern int __must_check driver_register(struct device_driver * drv);
145 extern void driver_unregister(struct device_driver * drv);
147 extern struct device_driver * get_driver(struct device_driver * drv);
148 extern void put_driver(struct device_driver * drv);
149 extern struct device_driver *driver_find(const char *name, struct bus_type *bus);
150 extern int driver_probe_done(void);
152 /* sysfs interface for exporting driver attributes */
154 struct driver_attribute {
155 struct attribute attr;
156 ssize_t (*show)(struct device_driver *, char * buf);
157 ssize_t (*store)(struct device_driver *, const char * buf, size_t count);
160 #define DRIVER_ATTR(_name,_mode,_show,_store) \
161 struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store)
163 extern int __must_check driver_create_file(struct device_driver *,
164 struct driver_attribute *);
165 extern void driver_remove_file(struct device_driver *, struct driver_attribute *);
167 extern int __must_check driver_for_each_device(struct device_driver * drv,
168 struct device *start, void *data,
169 int (*fn)(struct device *, void *));
170 struct device * driver_find_device(struct device_driver *drv,
171 struct device *start, void *data,
172 int (*match)(struct device *, void *));
179 struct module * owner;
182 struct list_head children;
183 struct list_head devices;
184 struct list_head interfaces;
185 struct kset class_dirs;
186 struct semaphore sem; /* locks both the children and interfaces lists */
188 struct class_attribute * class_attrs;
189 struct class_device_attribute * class_dev_attrs;
190 struct device_attribute * dev_attrs;
192 int (*uevent)(struct class_device *dev, char **envp,
193 int num_envp, char *buffer, int buffer_size);
194 int (*dev_uevent)(struct device *dev, char **envp, int num_envp,
195 char *buffer, int buffer_size);
197 void (*release)(struct class_device *dev);
198 void (*class_release)(struct class *class);
199 void (*dev_release)(struct device *dev);
201 int (*suspend)(struct device *, pm_message_t state);
202 int (*resume)(struct device *);
205 extern int __must_check class_register(struct class *);
206 extern void class_unregister(struct class *);
209 struct class_attribute {
210 struct attribute attr;
211 ssize_t (*show)(struct class *, char * buf);
212 ssize_t (*store)(struct class *, const char * buf, size_t count);
215 #define CLASS_ATTR(_name,_mode,_show,_store) \
216 struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
218 extern int __must_check class_create_file(struct class *,
219 const struct class_attribute *);
220 extern void class_remove_file(struct class *, const struct class_attribute *);
222 struct class_device_attribute {
223 struct attribute attr;
224 ssize_t (*show)(struct class_device *, char * buf);
225 ssize_t (*store)(struct class_device *, const char * buf, size_t count);
228 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store) \
229 struct class_device_attribute class_device_attr_##_name = \
230 __ATTR(_name,_mode,_show,_store)
232 extern int __must_check class_device_create_file(struct class_device *,
233 const struct class_device_attribute *);
236 * struct class_device - class devices
237 * @class: pointer to the parent class for this class device. This is required.
238 * @devt: for internal use by the driver core only.
239 * @node: for internal use by the driver core only.
240 * @kobj: for internal use by the driver core only.
241 * @devt_attr: for internal use by the driver core only.
242 * @groups: optional additional groups to be created
243 * @dev: if set, a symlink to the struct device is created in the sysfs
244 * directory for this struct class device.
245 * @class_data: pointer to whatever you want to store here for this struct
246 * class_device. Use class_get_devdata() and class_set_devdata() to get and
248 * @parent: pointer to a struct class_device that is the parent of this struct
249 * class_device. If NULL, this class_device will show up at the root of the
250 * struct class in sysfs (which is probably what you want to have happen.)
251 * @release: pointer to a release function for this struct class_device. If
252 * set, this will be called instead of the class specific release function.
253 * Only use this if you want to override the default release function, like
254 * when you are nesting class_device structures.
255 * @uevent: pointer to a uevent function for this struct class_device. If
256 * set, this will be called instead of the class specific uevent function.
257 * Only use this if you want to override the default uevent function, like
258 * when you are nesting class_device structures.
260 struct class_device {
261 struct list_head node;
264 struct class * class; /* required */
265 dev_t devt; /* dev_t, creates the sysfs "dev" */
266 struct class_device_attribute *devt_attr;
267 struct class_device_attribute uevent_attr;
268 struct device * dev; /* not necessary, but nice to have */
269 void * class_data; /* class-specific data */
270 struct class_device *parent; /* parent of this child device, if there is one */
271 struct attribute_group ** groups; /* optional groups */
273 void (*release)(struct class_device *dev);
274 int (*uevent)(struct class_device *dev, char **envp,
275 int num_envp, char *buffer, int buffer_size);
276 char class_id[BUS_ID_SIZE]; /* unique to this class */
280 class_get_devdata (struct class_device *dev)
282 return dev->class_data;
286 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, char **envp, int num_envp,
344 char *buffer, int buffer_size);
345 void (*release)(struct device *dev);
346 int (*suspend)(struct device * dev, pm_message_t state);
347 int (*resume)(struct device * dev);
350 /* interface for exporting device attributes */
351 struct device_attribute {
352 struct attribute attr;
353 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
355 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
356 const char *buf, size_t count);
359 #define DEVICE_ATTR(_name,_mode,_show,_store) \
360 struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
362 extern int __must_check device_create_file(struct device *device,
363 struct device_attribute * entry);
364 extern void device_remove_file(struct device * dev, 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 *), 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;
422 struct device_attribute uevent_attr;
423 struct device_attribute *devt_attr;
425 struct semaphore sem; /* semaphore to synchronize calls to
429 struct bus_type * bus; /* type of bus device is on */
430 struct device_driver *driver; /* which driver has allocated this
432 void *driver_data; /* data private to the driver */
433 void *platform_data; /* Platform specific data, device
434 core doesn't touch it */
435 struct dev_pm_info power;
438 int numa_node; /* NUMA node this device is close to */
440 u64 *dma_mask; /* dma mask (if dma'able device) */
441 u64 coherent_dma_mask;/* Like dma_mask, but for
442 alloc_coherent mappings as
443 not all hardware supports
444 64 bit addresses for consistent
445 allocations such descriptors. */
447 struct list_head dma_pools; /* dma pools (if dma'ble) */
449 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
451 /* arch specific additions */
452 struct dev_archdata archdata;
454 spinlock_t devres_lock;
455 struct list_head devres_head;
457 /* class_device migration path */
458 struct list_head node;
460 dev_t devt; /* dev_t, creates the sysfs "dev" */
461 struct attribute_group **groups; /* optional groups */
463 void (*release)(struct device * dev);
467 static inline int dev_to_node(struct device *dev)
469 return dev->numa_node;
471 static inline void set_dev_node(struct device *dev, int node)
473 dev->numa_node = node;
476 static inline int dev_to_node(struct device *dev)
480 static inline void set_dev_node(struct device *dev, int node)
486 dev_get_drvdata (struct device *dev)
488 return dev->driver_data;
492 dev_set_drvdata (struct device *dev, void *data)
494 dev->driver_data = data;
497 static inline int device_is_registered(struct device *dev)
499 return dev->is_registered;
502 void driver_init(void);
505 * High level routines for use by the bus drivers
507 extern int __must_check device_register(struct device * dev);
508 extern void device_unregister(struct device * dev);
509 extern void device_initialize(struct device * dev);
510 extern int __must_check device_add(struct device * dev);
511 extern void device_del(struct device * dev);
512 extern int device_for_each_child(struct device *, void *,
513 int (*fn)(struct device *, void *));
514 extern struct device *device_find_child(struct device *, void *data,
515 int (*match)(struct device *, void *));
516 extern int device_rename(struct device *dev, char *new_name);
517 extern int device_move(struct device *dev, struct device *new_parent);
520 * Manual binding of a device to driver. See drivers/base/bus.c
521 * for information on use.
523 extern int __must_check device_bind_driver(struct device *dev);
524 extern void device_release_driver(struct device * dev);
525 extern int __must_check device_attach(struct device * dev);
526 extern int __must_check driver_attach(struct device_driver *drv);
527 extern int __must_check device_reprobe(struct device *dev);
530 * Easy functions for dynamically creating devices on the fly
532 extern struct device *device_create(struct class *cls, struct device *parent,
533 dev_t devt, const char *fmt, ...)
534 __attribute__((format(printf,4,5)));
535 extern void device_destroy(struct class *cls, dev_t devt);
538 * Platform "fixup" functions - allow the platform to have their say
539 * about devices and actions that the general device layer doesn't
542 /* Notify platform of device discovery */
543 extern int (*platform_notify)(struct device * dev);
545 extern int (*platform_notify_remove)(struct device * dev);
549 * get_device - atomically increment the reference count for the device.
552 extern struct device * get_device(struct device * dev);
553 extern void put_device(struct device * dev);
556 /* drivers/base/power/shutdown.c */
557 extern void device_shutdown(void);
560 /* drivers/base/firmware.c */
561 extern int __must_check firmware_register(struct kset *);
562 extern void firmware_unregister(struct kset *);
564 /* debugging and troubleshooting/diagnostic helpers. */
565 extern const char *dev_driver_string(struct device *dev);
566 #define dev_printk(level, dev, format, arg...) \
567 printk(level "%s %s: " format , dev_driver_string(dev) , (dev)->bus_id , ## arg)
570 #define dev_dbg(dev, format, arg...) \
571 dev_printk(KERN_DEBUG , dev , format , ## arg)
573 static inline int __attribute__ ((format (printf, 2, 3)))
574 dev_dbg(struct device * dev, const char * fmt, ...)
580 #define dev_err(dev, format, arg...) \
581 dev_printk(KERN_ERR , dev , format , ## arg)
582 #define dev_info(dev, format, arg...) \
583 dev_printk(KERN_INFO , dev , format , ## arg)
584 #define dev_warn(dev, format, arg...) \
585 dev_printk(KERN_WARNING , dev , format , ## arg)
586 #define dev_notice(dev, format, arg...) \
587 dev_printk(KERN_NOTICE , dev , format , ## arg)
589 /* Create alias, so I can be autoloaded. */
590 #define MODULE_ALIAS_CHARDEV(major,minor) \
591 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
592 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
593 MODULE_ALIAS("char-major-" __stringify(major) "-*")
594 #endif /* _DEVICE_H_ */