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
);
55 int (*suspend
)(struct device
* dev
, pm_message_t state
);
56 int (*suspend_late
)(struct device
* dev
, pm_message_t state
);
57 int (*resume_early
)(struct device
* dev
);
58 int (*resume
)(struct device
* dev
);
61 extern int bus_register(struct bus_type
* bus
);
62 extern void bus_unregister(struct bus_type
* bus
);
64 extern void bus_rescan_devices(struct bus_type
* bus
);
66 /* iterator helpers for buses */
68 int bus_for_each_dev(struct bus_type
* bus
, struct device
* start
, void * data
,
69 int (*fn
)(struct device
*, void *));
70 struct device
* bus_find_device(struct bus_type
*bus
, struct device
*start
,
71 void *data
, int (*match
)(struct device
*, void *));
73 int bus_for_each_drv(struct bus_type
* bus
, struct device_driver
* start
,
74 void * data
, int (*fn
)(struct device_driver
*, void *));
77 /* driverfs interface for exporting bus attributes */
79 struct bus_attribute
{
80 struct attribute attr
;
81 ssize_t (*show
)(struct bus_type
*, char * buf
);
82 ssize_t (*store
)(struct bus_type
*, const char * buf
, size_t count
);
85 #define BUS_ATTR(_name,_mode,_show,_store) \
86 struct bus_attribute bus_attr_##_name = __ATTR(_name,_mode,_show,_store)
88 extern int bus_create_file(struct bus_type
*, struct bus_attribute
*);
89 extern void bus_remove_file(struct bus_type
*, struct bus_attribute
*);
91 struct device_driver
{
93 struct bus_type
* bus
;
95 struct completion unloaded
;
97 struct klist klist_devices
;
98 struct klist_node knode_bus
;
100 struct module
* owner
;
102 int (*probe
) (struct device
* dev
);
103 int (*remove
) (struct device
* dev
);
104 void (*shutdown
) (struct device
* dev
);
105 int (*suspend
) (struct device
* dev
, pm_message_t state
);
106 int (*resume
) (struct device
* dev
);
110 extern int driver_register(struct device_driver
* drv
);
111 extern void driver_unregister(struct device_driver
* drv
);
113 extern struct device_driver
* get_driver(struct device_driver
* drv
);
114 extern void put_driver(struct device_driver
* drv
);
115 extern struct device_driver
*driver_find(const char *name
, struct bus_type
*bus
);
118 /* driverfs interface for exporting driver attributes */
120 struct driver_attribute
{
121 struct attribute attr
;
122 ssize_t (*show
)(struct device_driver
*, char * buf
);
123 ssize_t (*store
)(struct device_driver
*, const char * buf
, size_t count
);
126 #define DRIVER_ATTR(_name,_mode,_show,_store) \
127 struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store)
129 extern int driver_create_file(struct device_driver
*, struct driver_attribute
*);
130 extern void driver_remove_file(struct device_driver
*, struct driver_attribute
*);
132 extern int driver_for_each_device(struct device_driver
* drv
, struct device
* start
,
133 void * data
, int (*fn
)(struct device
*, void *));
134 struct device
* driver_find_device(struct device_driver
*drv
,
135 struct device
*start
, void *data
,
136 int (*match
)(struct device
*, void *));
144 struct module
* owner
;
146 struct subsystem subsys
;
147 struct list_head children
;
148 struct list_head devices
;
149 struct list_head interfaces
;
150 struct semaphore sem
; /* locks both the children and interfaces lists */
152 struct class_attribute
* class_attrs
;
153 struct class_device_attribute
* class_dev_attrs
;
155 int (*uevent
)(struct class_device
*dev
, char **envp
,
156 int num_envp
, char *buffer
, int buffer_size
);
158 void (*release
)(struct class_device
*dev
);
159 void (*class_release
)(struct class *class);
161 int (*suspend
)(struct device
*, pm_message_t state
);
162 int (*resume
)(struct device
*);
165 extern int class_register(struct class *);
166 extern void class_unregister(struct class *);
169 struct class_attribute
{
170 struct attribute attr
;
171 ssize_t (*show
)(struct class *, char * buf
);
172 ssize_t (*store
)(struct class *, const char * buf
, size_t count
);
175 #define CLASS_ATTR(_name,_mode,_show,_store) \
176 struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
178 extern int class_create_file(struct class *, const struct class_attribute
*);
179 extern void class_remove_file(struct class *, const struct class_attribute
*);
181 struct class_device_attribute
{
182 struct attribute attr
;
183 ssize_t (*show
)(struct class_device
*, char * buf
);
184 ssize_t (*store
)(struct class_device
*, const char * buf
, size_t count
);
187 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store) \
188 struct class_device_attribute class_device_attr_##_name = \
189 __ATTR(_name,_mode,_show,_store)
191 extern int class_device_create_file(struct class_device
*,
192 const struct class_device_attribute
*);
195 * struct class_device - class devices
196 * @class: pointer to the parent class for this class device. This is required.
197 * @devt: for internal use by the driver core only.
198 * @node: for internal use by the driver core only.
199 * @kobj: for internal use by the driver core only.
200 * @devt_attr: for internal use by the driver core only.
201 * @groups: optional additional groups to be created
202 * @dev: if set, a symlink to the struct device is created in the sysfs
203 * directory for this struct class device.
204 * @class_data: pointer to whatever you want to store here for this struct
205 * class_device. Use class_get_devdata() and class_set_devdata() to get and
207 * @parent: pointer to a struct class_device that is the parent of this struct
208 * class_device. If NULL, this class_device will show up at the root of the
209 * struct class in sysfs (which is probably what you want to have happen.)
210 * @release: pointer to a release function for this struct class_device. If
211 * set, this will be called instead of the class specific release function.
212 * Only use this if you want to override the default release function, like
213 * when you are nesting class_device structures.
214 * @uevent: pointer to a uevent function for this struct class_device. If
215 * set, this will be called instead of the class specific uevent function.
216 * Only use this if you want to override the default uevent function, like
217 * when you are nesting class_device structures.
219 struct class_device
{
220 struct list_head node
;
223 struct class * class; /* required */
224 dev_t devt
; /* dev_t, creates the sysfs "dev" */
225 struct class_device_attribute
*devt_attr
;
226 struct class_device_attribute uevent_attr
;
227 struct device
* dev
; /* not necessary, but nice to have */
228 void * class_data
; /* class-specific data */
229 struct class_device
*parent
; /* parent of this child device, if there is one */
230 struct attribute_group
** groups
; /* optional groups */
232 void (*release
)(struct class_device
*dev
);
233 int (*uevent
)(struct class_device
*dev
, char **envp
,
234 int num_envp
, char *buffer
, int buffer_size
);
235 char class_id
[BUS_ID_SIZE
]; /* unique to this class */
239 class_get_devdata (struct class_device
*dev
)
241 return dev
->class_data
;
245 class_set_devdata (struct class_device
*dev
, void *data
)
247 dev
->class_data
= data
;
251 extern int class_device_register(struct class_device
*);
252 extern void class_device_unregister(struct class_device
*);
253 extern void class_device_initialize(struct class_device
*);
254 extern int class_device_add(struct class_device
*);
255 extern void class_device_del(struct class_device
*);
257 extern int class_device_rename(struct class_device
*, char *);
259 extern struct class_device
* class_device_get(struct class_device
*);
260 extern void class_device_put(struct class_device
*);
262 extern void class_device_remove_file(struct class_device
*,
263 const struct class_device_attribute
*);
264 extern int class_device_create_bin_file(struct class_device
*,
265 struct bin_attribute
*);
266 extern void class_device_remove_bin_file(struct class_device
*,
267 struct bin_attribute
*);
269 struct class_interface
{
270 struct list_head node
;
273 int (*add
) (struct class_device
*, struct class_interface
*);
274 void (*remove
) (struct class_device
*, struct class_interface
*);
277 extern int class_interface_register(struct class_interface
*);
278 extern void class_interface_unregister(struct class_interface
*);
280 extern struct class *class_create(struct module
*owner
, const char *name
);
281 extern void class_destroy(struct class *cls
);
282 extern struct class_device
*class_device_create(struct class *cls
,
283 struct class_device
*parent
,
285 struct device
*device
,
286 const char *fmt
, ...)
287 __attribute__((format(printf
,5,6)));
288 extern void class_device_destroy(struct class *cls
, dev_t devt
);
291 /* interface for exporting device attributes */
292 struct device_attribute
{
293 struct attribute attr
;
294 ssize_t (*show
)(struct device
*dev
, struct device_attribute
*attr
,
296 ssize_t (*store
)(struct device
*dev
, struct device_attribute
*attr
,
297 const char *buf
, size_t count
);
300 #define DEVICE_ATTR(_name,_mode,_show,_store) \
301 struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
303 extern int device_create_file(struct device
*device
, struct device_attribute
* entry
);
304 extern void device_remove_file(struct device
* dev
, struct device_attribute
* attr
);
306 struct klist klist_children
;
307 struct klist_node knode_parent
; /* node in sibling list */
308 struct klist_node knode_driver
;
309 struct klist_node knode_bus
;
310 struct device
* parent
;
313 char bus_id
[BUS_ID_SIZE
]; /* position on parent bus */
314 struct device_attribute uevent_attr
;
315 struct device_attribute
*devt_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 /* class_device migration path */
344 struct list_head node
;
345 struct class *class; /* optional*/
346 dev_t devt
; /* dev_t, creates the sysfs "dev" */
347 struct attribute_group
**groups
; /* optional groups */
349 void (*release
)(struct device
* dev
);
353 dev_get_drvdata (struct device
*dev
)
355 return dev
->driver_data
;
359 dev_set_drvdata (struct device
*dev
, void *data
)
361 dev
->driver_data
= data
;
364 static inline int device_is_registered(struct device
*dev
)
366 return klist_node_attached(&dev
->knode_bus
);
370 * High level routines for use by the bus drivers
372 extern int device_register(struct device
* dev
);
373 extern void device_unregister(struct device
* dev
);
374 extern void device_initialize(struct device
* dev
);
375 extern int device_add(struct device
* dev
);
376 extern void device_del(struct device
* dev
);
377 extern int device_for_each_child(struct device
*, void *,
378 int (*fn
)(struct device
*, void *));
381 * Manual binding of a device to driver. See drivers/base/bus.c
382 * for information on use.
384 extern void device_bind_driver(struct device
* dev
);
385 extern void device_release_driver(struct device
* dev
);
386 extern int device_attach(struct device
* dev
);
387 extern void driver_attach(struct device_driver
* drv
);
388 extern void device_reprobe(struct device
*dev
);
391 * Easy functions for dynamically creating devices on the fly
393 extern struct device
*device_create(struct class *cls
, struct device
*parent
,
394 dev_t devt
, const char *fmt
, ...)
395 __attribute__((format(printf
,4,5)));
396 extern void device_destroy(struct class *cls
, dev_t devt
);
399 * Platform "fixup" functions - allow the platform to have their say
400 * about devices and actions that the general device layer doesn't
403 /* Notify platform of device discovery */
404 extern int (*platform_notify
)(struct device
* dev
);
406 extern int (*platform_notify_remove
)(struct device
* dev
);
410 * get_device - atomically increment the reference count for the device.
413 extern struct device
* get_device(struct device
* dev
);
414 extern void put_device(struct device
* dev
);
417 /* drivers/base/power/shutdown.c */
418 extern void device_shutdown(void);
421 /* drivers/base/firmware.c */
422 extern int firmware_register(struct subsystem
*);
423 extern void firmware_unregister(struct subsystem
*);
425 /* debugging and troubleshooting/diagnostic helpers. */
426 extern const char *dev_driver_string(struct device
*dev
);
427 #define dev_printk(level, dev, format, arg...) \
428 printk(level "%s %s: " format , dev_driver_string(dev) , (dev)->bus_id , ## arg)
431 #define dev_dbg(dev, format, arg...) \
432 dev_printk(KERN_DEBUG , dev , format , ## arg)
434 #define dev_dbg(dev, format, arg...) do { (void)(dev); } while (0)
437 #define dev_err(dev, format, arg...) \
438 dev_printk(KERN_ERR , dev , format , ## arg)
439 #define dev_info(dev, format, arg...) \
440 dev_printk(KERN_INFO , dev , format , ## arg)
441 #define dev_warn(dev, format, arg...) \
442 dev_printk(KERN_WARNING , dev , format , ## arg)
443 #define dev_notice(dev, format, arg...) \
444 dev_printk(KERN_NOTICE , dev , format , ## arg)
446 /* Create alias, so I can be autoloaded. */
447 #define MODULE_ALIAS_CHARDEV(major,minor) \
448 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
449 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
450 MODULE_ALIAS("char-major-" __stringify(major) "-*")
451 #endif /* _DEVICE_H_ */