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/types.h>
19 #include <linux/module.h>
21 #include <asm/semaphore.h>
22 #include <asm/atomic.h>
24 #define DEVICE_NAME_SIZE 50
25 #define DEVICE_NAME_HALF __stringify(20) /* Less than half to accommodate slop */
26 #define DEVICE_ID_SIZE 32
27 #define BUS_ID_SIZE KOBJ_NAME_LEN
38 struct subsystem subsys
;
41 struct klist klist_devices
;
42 struct klist klist_drivers
;
44 struct bus_attribute
* bus_attrs
;
45 struct device_attribute
* dev_attrs
;
46 struct driver_attribute
* drv_attrs
;
48 int (*match
)(struct device
* dev
, struct device_driver
* drv
);
49 int (*uevent
)(struct device
*dev
, char **envp
,
50 int num_envp
, char *buffer
, int buffer_size
);
51 int (*probe
)(struct device
* dev
);
52 int (*remove
)(struct device
* dev
);
53 void (*shutdown
)(struct device
* dev
);
54 int (*suspend
)(struct device
* dev
, pm_message_t state
);
55 int (*resume
)(struct device
* dev
);
58 extern int bus_register(struct bus_type
* bus
);
59 extern void bus_unregister(struct bus_type
* bus
);
61 extern void bus_rescan_devices(struct bus_type
* bus
);
63 extern struct bus_type
* get_bus(struct bus_type
* bus
);
64 extern void put_bus(struct bus_type
* bus
);
66 extern struct bus_type
* find_bus(char * name
);
68 /* iterator helpers for buses */
70 int bus_for_each_dev(struct bus_type
* bus
, struct device
* start
, void * data
,
71 int (*fn
)(struct device
*, void *));
72 struct device
* bus_find_device(struct bus_type
*bus
, struct device
*start
,
73 void *data
, int (*match
)(struct device
*, void *));
75 int bus_for_each_drv(struct bus_type
* bus
, struct device_driver
* start
,
76 void * data
, int (*fn
)(struct device_driver
*, void *));
79 /* driverfs interface for exporting bus attributes */
81 struct bus_attribute
{
82 struct attribute attr
;
83 ssize_t (*show
)(struct bus_type
*, char * buf
);
84 ssize_t (*store
)(struct bus_type
*, const char * buf
, size_t count
);
87 #define BUS_ATTR(_name,_mode,_show,_store) \
88 struct bus_attribute bus_attr_##_name = __ATTR(_name,_mode,_show,_store)
90 extern int bus_create_file(struct bus_type
*, struct bus_attribute
*);
91 extern void bus_remove_file(struct bus_type
*, struct bus_attribute
*);
93 struct device_driver
{
95 struct bus_type
* bus
;
97 struct completion unloaded
;
99 struct klist klist_devices
;
100 struct klist_node knode_bus
;
102 struct module
* owner
;
104 int (*probe
) (struct device
* dev
);
105 int (*remove
) (struct device
* dev
);
106 void (*shutdown
) (struct device
* dev
);
107 int (*suspend
) (struct device
* dev
, pm_message_t state
);
108 int (*resume
) (struct device
* dev
);
112 extern int driver_register(struct device_driver
* drv
);
113 extern void driver_unregister(struct device_driver
* drv
);
115 extern struct device_driver
* get_driver(struct device_driver
* drv
);
116 extern void put_driver(struct device_driver
* drv
);
117 extern struct device_driver
*driver_find(const char *name
, struct bus_type
*bus
);
120 /* driverfs interface for exporting driver attributes */
122 struct driver_attribute
{
123 struct attribute attr
;
124 ssize_t (*show
)(struct device_driver
*, char * buf
);
125 ssize_t (*store
)(struct device_driver
*, const char * buf
, size_t count
);
128 #define DRIVER_ATTR(_name,_mode,_show,_store) \
129 struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store)
131 extern int driver_create_file(struct device_driver
*, struct driver_attribute
*);
132 extern void driver_remove_file(struct device_driver
*, struct driver_attribute
*);
134 extern int driver_for_each_device(struct device_driver
* drv
, struct device
* start
,
135 void * data
, int (*fn
)(struct device
*, void *));
136 struct device
* driver_find_device(struct device_driver
*drv
,
137 struct device
*start
, void *data
,
138 int (*match
)(struct device
*, void *));
146 struct module
* owner
;
148 struct subsystem subsys
;
149 struct list_head children
;
150 struct list_head interfaces
;
151 struct semaphore sem
; /* locks both the children and interfaces lists */
153 struct class_attribute
* class_attrs
;
154 struct class_device_attribute
* class_dev_attrs
;
156 int (*uevent
)(struct class_device
*dev
, char **envp
,
157 int num_envp
, char *buffer
, int buffer_size
);
159 void (*release
)(struct class_device
*dev
);
160 void (*class_release
)(struct class *class);
163 extern int class_register(struct class *);
164 extern void class_unregister(struct class *);
166 extern struct class * class_get(struct class *);
167 extern void class_put(struct class *);
170 struct class_attribute
{
171 struct attribute attr
;
172 ssize_t (*show
)(struct class *, char * buf
);
173 ssize_t (*store
)(struct class *, const char * buf
, size_t count
);
176 #define CLASS_ATTR(_name,_mode,_show,_store) \
177 struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
179 extern int class_create_file(struct class *, const struct class_attribute
*);
180 extern void class_remove_file(struct class *, const struct class_attribute
*);
182 struct class_device_attribute
{
183 struct attribute attr
;
184 ssize_t (*show
)(struct class_device
*, char * buf
);
185 ssize_t (*store
)(struct class_device
*, const char * buf
, size_t count
);
188 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store) \
189 struct class_device_attribute class_device_attr_##_name = \
190 __ATTR(_name,_mode,_show,_store)
192 extern int class_device_create_file(struct class_device
*,
193 const struct class_device_attribute
*);
196 * struct class_device - class devices
197 * @class: pointer to the parent class for this class device. This is required.
198 * @devt: for internal use by the driver core only.
199 * @node: for internal use by the driver core only.
200 * @kobj: for internal use by the driver core only.
201 * @devt_attr: for internal use by the driver core only.
202 * @groups: optional additional groups to be created
203 * @dev: if set, a symlink to the struct device is created in the sysfs
204 * directory for this struct class device.
205 * @class_data: pointer to whatever you want to store here for this struct
206 * class_device. Use class_get_devdata() and class_set_devdata() to get and
208 * @parent: pointer to a struct class_device that is the parent of this struct
209 * class_device. If NULL, this class_device will show up at the root of the
210 * struct class in sysfs (which is probably what you want to have happen.)
211 * @release: pointer to a release function for this struct class_device. If
212 * set, this will be called instead of the class specific release function.
213 * Only use this if you want to override the default release function, like
214 * when you are nesting class_device structures.
215 * @uevent: pointer to a uevent function for this struct class_device. If
216 * set, this will be called instead of the class specific uevent function.
217 * Only use this if you want to override the default uevent function, like
218 * when you are nesting class_device structures.
220 struct class_device
{
221 struct list_head node
;
224 struct class * class; /* required */
225 dev_t devt
; /* dev_t, creates the sysfs "dev" */
226 struct class_device_attribute
*devt_attr
;
227 struct class_device_attribute uevent_attr
;
228 struct device
* dev
; /* not necessary, but nice to have */
229 void * class_data
; /* class-specific data */
230 struct class_device
*parent
; /* parent of this child device, if there is one */
231 struct attribute_group
** groups
; /* optional groups */
233 void (*release
)(struct class_device
*dev
);
234 int (*uevent
)(struct class_device
*dev
, char **envp
,
235 int num_envp
, char *buffer
, int buffer_size
);
236 char class_id
[BUS_ID_SIZE
]; /* unique to this class */
240 class_get_devdata (struct class_device
*dev
)
242 return dev
->class_data
;
246 class_set_devdata (struct class_device
*dev
, void *data
)
248 dev
->class_data
= data
;
252 extern int class_device_register(struct class_device
*);
253 extern void class_device_unregister(struct class_device
*);
254 extern void class_device_initialize(struct class_device
*);
255 extern int class_device_add(struct class_device
*);
256 extern void class_device_del(struct class_device
*);
258 extern int class_device_rename(struct class_device
*, char *);
260 extern struct class_device
* class_device_get(struct class_device
*);
261 extern void class_device_put(struct class_device
*);
263 extern void class_device_remove_file(struct class_device
*,
264 const struct class_device_attribute
*);
265 extern int class_device_create_bin_file(struct class_device
*,
266 struct bin_attribute
*);
267 extern void class_device_remove_bin_file(struct class_device
*,
268 struct bin_attribute
*);
270 struct class_interface
{
271 struct list_head node
;
274 int (*add
) (struct class_device
*, struct class_interface
*);
275 void (*remove
) (struct class_device
*, struct class_interface
*);
278 extern int class_interface_register(struct class_interface
*);
279 extern void class_interface_unregister(struct class_interface
*);
281 extern struct class *class_create(struct module
*owner
, char *name
);
282 extern void class_destroy(struct class *cls
);
283 extern struct class_device
*class_device_create(struct class *cls
,
284 struct class_device
*parent
,
286 struct device
*device
,
288 __attribute__((format(printf
,5,6)));
289 extern void class_device_destroy(struct class *cls
, dev_t devt
);
292 /* interface for exporting device attributes */
293 struct device_attribute
{
294 struct attribute attr
;
295 ssize_t (*show
)(struct device
*dev
, struct device_attribute
*attr
,
297 ssize_t (*store
)(struct device
*dev
, struct device_attribute
*attr
,
298 const char *buf
, size_t count
);
301 #define DEVICE_ATTR(_name,_mode,_show,_store) \
302 struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
304 extern int device_create_file(struct device
*device
, struct device_attribute
* entry
);
305 extern void device_remove_file(struct device
* dev
, struct device_attribute
* attr
);
307 struct klist klist_children
;
308 struct klist_node knode_parent
; /* node in sibling list */
309 struct klist_node knode_driver
;
310 struct klist_node knode_bus
;
311 struct device
* parent
;
314 char bus_id
[BUS_ID_SIZE
]; /* position on parent bus */
315 struct device_attribute uevent_attr
;
317 struct semaphore sem
; /* semaphore to synchronize calls to
321 struct bus_type
* bus
; /* type of bus device is on */
322 struct device_driver
*driver
; /* which driver has allocated this
324 void *driver_data
; /* data private to the driver */
325 void *platform_data
; /* Platform specific data, device
326 core doesn't touch it */
327 void *firmware_data
; /* Firmware specific data (e.g. ACPI,
328 BIOS data),reserved for device core*/
329 struct dev_pm_info power
;
331 u64
*dma_mask
; /* dma mask (if dma'able device) */
332 u64 coherent_dma_mask
;/* Like dma_mask, but for
333 alloc_coherent mappings as
334 not all hardware supports
335 64 bit addresses for consistent
336 allocations such descriptors. */
338 struct list_head dma_pools
; /* dma pools (if dma'ble) */
340 struct dma_coherent_mem
*dma_mem
; /* internal for coherent mem
343 void (*release
)(struct device
* dev
);
347 dev_get_drvdata (struct device
*dev
)
349 return dev
->driver_data
;
353 dev_set_drvdata (struct device
*dev
, void *data
)
355 dev
->driver_data
= data
;
358 static inline int device_is_registered(struct device
*dev
)
360 return klist_node_attached(&dev
->knode_bus
);
364 * High level routines for use by the bus drivers
366 extern int device_register(struct device
* dev
);
367 extern void device_unregister(struct device
* dev
);
368 extern void device_initialize(struct device
* dev
);
369 extern int device_add(struct device
* dev
);
370 extern void device_del(struct device
* dev
);
371 extern int device_for_each_child(struct device
*, void *,
372 int (*fn
)(struct device
*, void *));
375 * Manual binding of a device to driver. See drivers/base/bus.c
376 * for information on use.
378 extern void device_bind_driver(struct device
* dev
);
379 extern void device_release_driver(struct device
* dev
);
380 extern int device_attach(struct device
* dev
);
381 extern void driver_attach(struct device_driver
* drv
);
382 extern void device_reprobe(struct device
*dev
);
386 * Platform "fixup" functions - allow the platform to have their say
387 * about devices and actions that the general device layer doesn't
390 /* Notify platform of device discovery */
391 extern int (*platform_notify
)(struct device
* dev
);
393 extern int (*platform_notify_remove
)(struct device
* dev
);
397 * get_device - atomically increment the reference count for the device.
400 extern struct device
* get_device(struct device
* dev
);
401 extern void put_device(struct device
* dev
);
404 /* drivers/base/power/shutdown.c */
405 extern void device_shutdown(void);
408 /* drivers/base/firmware.c */
409 extern int firmware_register(struct subsystem
*);
410 extern void firmware_unregister(struct subsystem
*);
412 /* debugging and troubleshooting/diagnostic helpers. */
413 #define dev_printk(level, dev, format, arg...) \
414 printk(level "%s %s: " format , (dev)->driver ? (dev)->driver->name : "" , (dev)->bus_id , ## arg)
417 #define dev_dbg(dev, format, arg...) \
418 dev_printk(KERN_DEBUG , dev , format , ## arg)
420 #define dev_dbg(dev, format, arg...) do { (void)(dev); } while (0)
423 #define dev_err(dev, format, arg...) \
424 dev_printk(KERN_ERR , dev , format , ## arg)
425 #define dev_info(dev, format, arg...) \
426 dev_printk(KERN_INFO , dev , format , ## arg)
427 #define dev_warn(dev, format, arg...) \
428 dev_printk(KERN_WARNING , dev , format , ## arg)
429 #define dev_notice(dev, format, arg...) \
430 dev_printk(KERN_NOTICE , dev , format , ## arg)
432 /* Create alias, so I can be autoloaded. */
433 #define MODULE_ALIAS_CHARDEV(major,minor) \
434 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
435 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
436 MODULE_ALIAS("char-major-" __stringify(major) "-*")
437 #endif /* _DEVICE_H_ */