2 * device.h - generic, centralized driver model
4 * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
6 * This file is released under the GPLv2
8 * See Documentation/driver-model/ for more information.
14 #include <linux/ioport.h>
15 #include <linux/kobject.h>
16 #include <linux/klist.h>
17 #include <linux/list.h>
18 #include <linux/compiler.h>
19 #include <linux/types.h>
20 #include <linux/module.h>
22 #include <asm/semaphore.h>
23 #include <asm/atomic.h>
24 #include <asm/device.h>
26 #define DEVICE_NAME_SIZE 50
27 #define DEVICE_NAME_HALF __stringify(20) /* Less than half to accommodate slop */
28 #define DEVICE_ID_SIZE 32
29 #define BUS_ID_SIZE KOBJ_NAME_LEN
40 struct subsystem subsys
;
43 struct klist klist_devices
;
44 struct klist klist_drivers
;
46 struct blocking_notifier_head bus_notifier
;
48 struct bus_attribute
* bus_attrs
;
49 struct device_attribute
* dev_attrs
;
50 struct driver_attribute
* drv_attrs
;
52 int (*match
)(struct device
* dev
, struct device_driver
* drv
);
53 int (*uevent
)(struct device
*dev
, char **envp
,
54 int num_envp
, char *buffer
, int buffer_size
);
55 int (*probe
)(struct device
* dev
);
56 int (*remove
)(struct device
* dev
);
57 void (*shutdown
)(struct device
* dev
);
59 int (*suspend
)(struct device
* dev
, pm_message_t state
);
60 int (*suspend_late
)(struct device
* dev
, pm_message_t state
);
61 int (*resume_early
)(struct device
* dev
);
62 int (*resume
)(struct device
* dev
);
65 extern int __must_check
bus_register(struct bus_type
* bus
);
66 extern void bus_unregister(struct bus_type
* bus
);
68 extern int __must_check
bus_rescan_devices(struct bus_type
* bus
);
70 /* iterator helpers for buses */
72 int bus_for_each_dev(struct bus_type
* bus
, struct device
* start
, void * data
,
73 int (*fn
)(struct device
*, void *));
74 struct device
* bus_find_device(struct bus_type
*bus
, struct device
*start
,
75 void *data
, int (*match
)(struct device
*, void *));
77 int __must_check
bus_for_each_drv(struct bus_type
*bus
,
78 struct device_driver
*start
, void *data
,
79 int (*fn
)(struct device_driver
*, void *));
82 * Bus notifiers: Get notified of addition/removal of devices
83 * and binding/unbinding of drivers to devices.
84 * In the long run, it should be a replacement for the platform
87 struct notifier_block
;
89 extern int bus_register_notifier(struct bus_type
*bus
,
90 struct notifier_block
*nb
);
91 extern int bus_unregister_notifier(struct bus_type
*bus
,
92 struct notifier_block
*nb
);
94 /* All 4 notifers below get called with the target struct device *
95 * as an argument. Note that those functions are likely to be called
96 * with the device semaphore held in the core, so be careful.
98 #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
99 #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device removed */
100 #define BUS_NOTIFY_BOUND_DRIVER 0x00000003 /* driver bound to device */
101 #define BUS_NOTIFY_UNBIND_DRIVER 0x00000004 /* driver about to be
104 /* driverfs interface for exporting bus attributes */
106 struct bus_attribute
{
107 struct attribute attr
;
108 ssize_t (*show
)(struct bus_type
*, char * buf
);
109 ssize_t (*store
)(struct bus_type
*, const char * buf
, size_t count
);
112 #define BUS_ATTR(_name,_mode,_show,_store) \
113 struct bus_attribute bus_attr_##_name = __ATTR(_name,_mode,_show,_store)
115 extern int __must_check
bus_create_file(struct bus_type
*,
116 struct bus_attribute
*);
117 extern void bus_remove_file(struct bus_type
*, struct bus_attribute
*);
119 struct device_driver
{
121 struct bus_type
* bus
;
123 struct completion unloaded
;
125 struct klist klist_devices
;
126 struct klist_node knode_bus
;
128 struct module
* owner
;
130 int (*probe
) (struct device
* dev
);
131 int (*remove
) (struct device
* dev
);
132 void (*shutdown
) (struct device
* dev
);
133 int (*suspend
) (struct device
* dev
, pm_message_t state
);
134 int (*resume
) (struct device
* dev
);
136 unsigned int multithread_probe
:1;
140 extern int __must_check
driver_register(struct device_driver
* drv
);
141 extern void driver_unregister(struct device_driver
* drv
);
143 extern struct device_driver
* get_driver(struct device_driver
* drv
);
144 extern void put_driver(struct device_driver
* drv
);
145 extern struct device_driver
*driver_find(const char *name
, struct bus_type
*bus
);
146 extern int driver_probe_done(void);
148 /* driverfs interface for exporting driver attributes */
150 struct driver_attribute
{
151 struct attribute attr
;
152 ssize_t (*show
)(struct device_driver
*, char * buf
);
153 ssize_t (*store
)(struct device_driver
*, const char * buf
, size_t count
);
156 #define DRIVER_ATTR(_name,_mode,_show,_store) \
157 struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store)
159 extern int __must_check
driver_create_file(struct device_driver
*,
160 struct driver_attribute
*);
161 extern void driver_remove_file(struct device_driver
*, struct driver_attribute
*);
163 extern int __must_check
driver_for_each_device(struct device_driver
* drv
,
164 struct device
*start
, void *data
,
165 int (*fn
)(struct device
*, void *));
166 struct device
* driver_find_device(struct device_driver
*drv
,
167 struct device
*start
, void *data
,
168 int (*match
)(struct device
*, void *));
175 struct module
* owner
;
177 struct subsystem subsys
;
178 struct list_head children
;
179 struct list_head devices
;
180 struct list_head interfaces
;
181 struct semaphore sem
; /* locks both the children and interfaces lists */
183 struct kobject
*virtual_dir
;
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
, char **envp
,
190 int num_envp
, char *buffer
, int buffer_size
);
191 int (*dev_uevent
)(struct device
*dev
, char **envp
, int num_envp
,
192 char *buffer
, int buffer_size
);
194 void (*release
)(struct class_device
*dev
);
195 void (*class_release
)(struct class *class);
196 void (*dev_release
)(struct device
*dev
);
198 int (*suspend
)(struct device
*, pm_message_t state
);
199 int (*resume
)(struct device
*);
202 extern int __must_check
class_register(struct class *);
203 extern void class_unregister(struct class *);
206 struct class_attribute
{
207 struct attribute attr
;
208 ssize_t (*show
)(struct class *, char * buf
);
209 ssize_t (*store
)(struct class *, const char * buf
, size_t count
);
212 #define CLASS_ATTR(_name,_mode,_show,_store) \
213 struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
215 extern int __must_check
class_create_file(struct class *,
216 const struct class_attribute
*);
217 extern void class_remove_file(struct class *, const struct class_attribute
*);
219 struct class_device_attribute
{
220 struct attribute attr
;
221 ssize_t (*show
)(struct class_device
*, char * buf
);
222 ssize_t (*store
)(struct class_device
*, const char * buf
, size_t count
);
225 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store) \
226 struct class_device_attribute class_device_attr_##_name = \
227 __ATTR(_name,_mode,_show,_store)
229 extern int __must_check
class_device_create_file(struct class_device
*,
230 const struct class_device_attribute
*);
233 * struct class_device - class devices
234 * @class: pointer to the parent class for this class device. This is required.
235 * @devt: for internal use by the driver core only.
236 * @node: for internal use by the driver core only.
237 * @kobj: for internal use by the driver core only.
238 * @devt_attr: 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 class_device_attribute
*devt_attr
;
264 struct class_device_attribute uevent_attr
;
265 struct device
* dev
; /* not necessary, but nice to have */
266 void * class_data
; /* class-specific data */
267 struct class_device
*parent
; /* parent of this child device, if there is one */
268 struct attribute_group
** groups
; /* optional groups */
270 void (*release
)(struct class_device
*dev
);
271 int (*uevent
)(struct class_device
*dev
, char **envp
,
272 int num_envp
, char *buffer
, int buffer_size
);
273 char class_id
[BUS_ID_SIZE
]; /* unique to this class */
277 class_get_devdata (struct class_device
*dev
)
279 return dev
->class_data
;
283 class_set_devdata (struct class_device
*dev
, void *data
)
285 dev
->class_data
= data
;
289 extern int __must_check
class_device_register(struct class_device
*);
290 extern void class_device_unregister(struct class_device
*);
291 extern void class_device_initialize(struct class_device
*);
292 extern int __must_check
class_device_add(struct class_device
*);
293 extern void class_device_del(struct class_device
*);
295 extern int class_device_rename(struct class_device
*, char *);
297 extern struct class_device
* class_device_get(struct class_device
*);
298 extern void class_device_put(struct class_device
*);
300 extern void class_device_remove_file(struct class_device
*,
301 const struct class_device_attribute
*);
302 extern int __must_check
class_device_create_bin_file(struct class_device
*,
303 struct bin_attribute
*);
304 extern void class_device_remove_bin_file(struct class_device
*,
305 struct bin_attribute
*);
307 struct class_interface
{
308 struct list_head node
;
311 int (*add
) (struct class_device
*, struct class_interface
*);
312 void (*remove
) (struct class_device
*, struct class_interface
*);
313 int (*add_dev
) (struct device
*, struct class_interface
*);
314 void (*remove_dev
) (struct device
*, struct class_interface
*);
317 extern int __must_check
class_interface_register(struct class_interface
*);
318 extern void class_interface_unregister(struct class_interface
*);
320 extern struct class *class_create(struct module
*owner
, const char *name
);
321 extern void class_destroy(struct class *cls
);
322 extern struct class_device
*class_device_create(struct class *cls
,
323 struct class_device
*parent
,
325 struct device
*device
,
326 const char *fmt
, ...)
327 __attribute__((format(printf
,5,6)));
328 extern void class_device_destroy(struct class *cls
, dev_t devt
);
330 /* interface for exporting device attributes */
331 struct device_attribute
{
332 struct attribute attr
;
333 ssize_t (*show
)(struct device
*dev
, struct device_attribute
*attr
,
335 ssize_t (*store
)(struct device
*dev
, struct device_attribute
*attr
,
336 const char *buf
, size_t count
);
339 #define DEVICE_ATTR(_name,_mode,_show,_store) \
340 struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
342 extern int __must_check
device_create_file(struct device
*device
,
343 struct device_attribute
* entry
);
344 extern void device_remove_file(struct device
* dev
, struct device_attribute
* attr
);
345 extern int __must_check
device_create_bin_file(struct device
*dev
,
346 struct bin_attribute
*attr
);
347 extern void device_remove_bin_file(struct device
*dev
,
348 struct bin_attribute
*attr
);
350 struct klist klist_children
;
351 struct klist_node knode_parent
; /* node in sibling list */
352 struct klist_node knode_driver
;
353 struct klist_node knode_bus
;
354 struct device
* parent
;
357 char bus_id
[BUS_ID_SIZE
]; /* position on parent bus */
358 unsigned is_registered
:1;
359 struct device_attribute uevent_attr
;
360 struct device_attribute
*devt_attr
;
362 struct semaphore sem
; /* semaphore to synchronize calls to
366 struct bus_type
* bus
; /* type of bus device is on */
367 struct device_driver
*driver
; /* which driver has allocated this
369 void *driver_data
; /* data private to the driver */
370 void *platform_data
; /* Platform specific data, device
371 core doesn't touch it */
372 struct dev_pm_info power
;
375 int numa_node
; /* NUMA node this device is close to */
377 u64
*dma_mask
; /* dma mask (if dma'able device) */
378 u64 coherent_dma_mask
;/* Like dma_mask, but for
379 alloc_coherent mappings as
380 not all hardware supports
381 64 bit addresses for consistent
382 allocations such descriptors. */
384 struct list_head dma_pools
; /* dma pools (if dma'ble) */
386 struct dma_coherent_mem
*dma_mem
; /* internal for coherent mem
388 /* arch specific additions */
389 struct dev_archdata archdata
;
391 /* class_device migration path */
392 struct list_head node
;
393 struct class *class; /* optional*/
394 dev_t devt
; /* dev_t, creates the sysfs "dev" */
395 struct attribute_group
**groups
; /* optional groups */
397 void (*release
)(struct device
* dev
);
401 static inline int dev_to_node(struct device
*dev
)
403 return dev
->numa_node
;
405 static inline void set_dev_node(struct device
*dev
, int node
)
407 dev
->numa_node
= node
;
410 static inline int dev_to_node(struct device
*dev
)
414 static inline void set_dev_node(struct device
*dev
, int node
)
420 dev_get_drvdata (struct device
*dev
)
422 return dev
->driver_data
;
426 dev_set_drvdata (struct device
*dev
, void *data
)
428 dev
->driver_data
= data
;
431 static inline int device_is_registered(struct device
*dev
)
433 return dev
->is_registered
;
437 * High level routines for use by the bus drivers
439 extern int __must_check
device_register(struct device
* dev
);
440 extern void device_unregister(struct device
* dev
);
441 extern void device_initialize(struct device
* dev
);
442 extern int __must_check
device_add(struct device
* dev
);
443 extern void device_del(struct device
* dev
);
444 extern int device_for_each_child(struct device
*, void *,
445 int (*fn
)(struct device
*, void *));
446 extern struct device
*device_find_child(struct device
*, void *data
,
447 int (*match
)(struct device
*, void *));
448 extern int device_rename(struct device
*dev
, char *new_name
);
449 extern int device_move(struct device
*dev
, struct device
*new_parent
);
452 * Manual binding of a device to driver. See drivers/base/bus.c
453 * for information on use.
455 extern int __must_check
device_bind_driver(struct device
*dev
);
456 extern void device_release_driver(struct device
* dev
);
457 extern int __must_check
device_attach(struct device
* dev
);
458 extern int __must_check
driver_attach(struct device_driver
*drv
);
459 extern int __must_check
device_reprobe(struct device
*dev
);
462 * Easy functions for dynamically creating devices on the fly
464 extern struct device
*device_create(struct class *cls
, struct device
*parent
,
465 dev_t devt
, const char *fmt
, ...)
466 __attribute__((format(printf
,4,5)));
467 extern void device_destroy(struct class *cls
, dev_t devt
);
470 * Platform "fixup" functions - allow the platform to have their say
471 * about devices and actions that the general device layer doesn't
474 /* Notify platform of device discovery */
475 extern int (*platform_notify
)(struct device
* dev
);
477 extern int (*platform_notify_remove
)(struct device
* dev
);
481 * get_device - atomically increment the reference count for the device.
484 extern struct device
* get_device(struct device
* dev
);
485 extern void put_device(struct device
* dev
);
488 /* drivers/base/power/shutdown.c */
489 extern void device_shutdown(void);
492 /* drivers/base/firmware.c */
493 extern int __must_check
firmware_register(struct subsystem
*);
494 extern void firmware_unregister(struct subsystem
*);
496 /* debugging and troubleshooting/diagnostic helpers. */
497 extern const char *dev_driver_string(struct device
*dev
);
498 #define dev_printk(level, dev, format, arg...) \
499 printk(level "%s %s: " format , dev_driver_string(dev) , (dev)->bus_id , ## arg)
502 #define dev_dbg(dev, format, arg...) \
503 dev_printk(KERN_DEBUG , dev , format , ## arg)
505 #define dev_dbg(dev, format, arg...) do { (void)(dev); } while (0)
508 #define dev_err(dev, format, arg...) \
509 dev_printk(KERN_ERR , dev , format , ## arg)
510 #define dev_info(dev, format, arg...) \
511 dev_printk(KERN_INFO , dev , format , ## arg)
512 #define dev_warn(dev, format, arg...) \
513 dev_printk(KERN_WARNING , dev , format , ## arg)
514 #define dev_notice(dev, format, arg...) \
515 dev_printk(KERN_NOTICE , dev , format , ## arg)
517 /* Create alias, so I can be autoloaded. */
518 #define MODULE_ALIAS_CHARDEV(major,minor) \
519 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
520 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
521 MODULE_ALIAS("char-major-" __stringify(major) "-*")
522 #endif /* _DEVICE_H_ */