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>
25 #define DEVICE_NAME_SIZE 50
26 #define DEVICE_NAME_HALF __stringify(20) /* Less than half to accommodate slop */
27 #define DEVICE_ID_SIZE 32
28 #define BUS_ID_SIZE KOBJ_NAME_LEN
39 struct subsystem subsys;
42 struct klist klist_devices;
43 struct klist klist_drivers;
45 struct bus_attribute * bus_attrs;
46 struct device_attribute * dev_attrs;
47 struct driver_attribute * drv_attrs;
49 int (*match)(struct device * dev, struct device_driver * drv);
50 int (*uevent)(struct device *dev, char **envp,
51 int num_envp, char *buffer, int buffer_size);
52 int (*probe)(struct device * dev);
53 int (*remove)(struct device * dev);
54 void (*shutdown)(struct device * dev);
56 int (*suspend)(struct device * dev, pm_message_t state);
57 int (*suspend_late)(struct device * dev, pm_message_t state);
58 int (*resume_early)(struct device * dev);
59 int (*resume)(struct device * dev);
62 extern int __must_check bus_register(struct bus_type * bus);
63 extern void bus_unregister(struct bus_type * bus);
65 extern void bus_rescan_devices(struct bus_type * bus);
67 /* iterator helpers for buses */
69 int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data,
70 int (*fn)(struct device *, void *));
71 struct device * bus_find_device(struct bus_type *bus, struct device *start,
72 void *data, int (*match)(struct device *, void *));
74 int __must_check bus_for_each_drv(struct bus_type *bus,
75 struct device_driver *start, void *data,
76 int (*fn)(struct device_driver *, void *));
78 /* driverfs interface for exporting bus attributes */
80 struct bus_attribute {
81 struct attribute attr;
82 ssize_t (*show)(struct bus_type *, char * buf);
83 ssize_t (*store)(struct bus_type *, const char * buf, size_t count);
86 #define BUS_ATTR(_name,_mode,_show,_store) \
87 struct bus_attribute bus_attr_##_name = __ATTR(_name,_mode,_show,_store)
89 extern int __must_check bus_create_file(struct bus_type *,
90 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 __must_check 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);
119 /* driverfs interface for exporting driver attributes */
121 struct driver_attribute {
122 struct attribute attr;
123 ssize_t (*show)(struct device_driver *, char * buf);
124 ssize_t (*store)(struct device_driver *, const char * buf, size_t count);
127 #define DRIVER_ATTR(_name,_mode,_show,_store) \
128 struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store)
130 extern int __must_check driver_create_file(struct device_driver *,
131 struct driver_attribute *);
132 extern void driver_remove_file(struct device_driver *, struct driver_attribute *);
134 extern int __must_check driver_for_each_device(struct device_driver * drv,
135 struct device *start, void *data,
136 int (*fn)(struct device *, void *));
137 struct device * driver_find_device(struct device_driver *drv,
138 struct device *start, void *data,
139 int (*match)(struct device *, void *));
146 struct module * owner;
148 struct subsystem subsys;
149 struct list_head children;
150 struct list_head devices;
151 struct list_head interfaces;
152 struct semaphore sem; /* locks both the children and interfaces lists */
154 struct kobject *virtual_dir;
156 struct class_attribute * class_attrs;
157 struct class_device_attribute * class_dev_attrs;
158 struct device_attribute * dev_attrs;
160 int (*uevent)(struct class_device *dev, char **envp,
161 int num_envp, char *buffer, int buffer_size);
162 int (*dev_uevent)(struct device *dev, char **envp, int num_envp,
163 char *buffer, int buffer_size);
165 void (*release)(struct class_device *dev);
166 void (*class_release)(struct class *class);
167 void (*dev_release)(struct device *dev);
169 int (*suspend)(struct device *, pm_message_t state);
170 int (*resume)(struct device *);
173 extern int __must_check class_register(struct class *);
174 extern void class_unregister(struct class *);
177 struct class_attribute {
178 struct attribute attr;
179 ssize_t (*show)(struct class *, char * buf);
180 ssize_t (*store)(struct class *, const char * buf, size_t count);
183 #define CLASS_ATTR(_name,_mode,_show,_store) \
184 struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
186 extern int __must_check class_create_file(struct class *,
187 const struct class_attribute *);
188 extern void class_remove_file(struct class *, const struct class_attribute *);
190 struct class_device_attribute {
191 struct attribute attr;
192 ssize_t (*show)(struct class_device *, char * buf);
193 ssize_t (*store)(struct class_device *, const char * buf, size_t count);
196 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store) \
197 struct class_device_attribute class_device_attr_##_name = \
198 __ATTR(_name,_mode,_show,_store)
200 extern int __must_check class_device_create_file(struct class_device *,
201 const struct class_device_attribute *);
204 * struct class_device - class devices
205 * @class: pointer to the parent class for this class device. This is required.
206 * @devt: for internal use by the driver core only.
207 * @node: for internal use by the driver core only.
208 * @kobj: for internal use by the driver core only.
209 * @devt_attr: for internal use by the driver core only.
210 * @groups: optional additional groups to be created
211 * @dev: if set, a symlink to the struct device is created in the sysfs
212 * directory for this struct class device.
213 * @class_data: pointer to whatever you want to store here for this struct
214 * class_device. Use class_get_devdata() and class_set_devdata() to get and
216 * @parent: pointer to a struct class_device that is the parent of this struct
217 * class_device. If NULL, this class_device will show up at the root of the
218 * struct class in sysfs (which is probably what you want to have happen.)
219 * @release: pointer to a release function for this struct class_device. If
220 * set, this will be called instead of the class specific release function.
221 * Only use this if you want to override the default release function, like
222 * when you are nesting class_device structures.
223 * @uevent: pointer to a uevent function for this struct class_device. If
224 * set, this will be called instead of the class specific uevent function.
225 * Only use this if you want to override the default uevent function, like
226 * when you are nesting class_device structures.
228 struct class_device {
229 struct list_head node;
232 struct class * class; /* required */
233 dev_t devt; /* dev_t, creates the sysfs "dev" */
234 struct class_device_attribute *devt_attr;
235 struct class_device_attribute uevent_attr;
236 struct device * dev; /* not necessary, but nice to have */
237 void * class_data; /* class-specific data */
238 struct class_device *parent; /* parent of this child device, if there is one */
239 struct attribute_group ** groups; /* optional groups */
241 void (*release)(struct class_device *dev);
242 int (*uevent)(struct class_device *dev, char **envp,
243 int num_envp, char *buffer, int buffer_size);
244 char class_id[BUS_ID_SIZE]; /* unique to this class */
248 class_get_devdata (struct class_device *dev)
250 return dev->class_data;
254 class_set_devdata (struct class_device *dev, void *data)
256 dev->class_data = data;
260 extern int __must_check class_device_register(struct class_device *);
261 extern void class_device_unregister(struct class_device *);
262 extern void class_device_initialize(struct class_device *);
263 extern int __must_check class_device_add(struct class_device *);
264 extern void class_device_del(struct class_device *);
266 extern int class_device_rename(struct class_device *, char *);
268 extern struct class_device * class_device_get(struct class_device *);
269 extern void class_device_put(struct class_device *);
271 extern void class_device_remove_file(struct class_device *,
272 const struct class_device_attribute *);
273 extern int __must_check class_device_create_bin_file(struct class_device *,
274 struct bin_attribute *);
275 extern void class_device_remove_bin_file(struct class_device *,
276 struct bin_attribute *);
278 struct class_interface {
279 struct list_head node;
282 int (*add) (struct class_device *, struct class_interface *);
283 void (*remove) (struct class_device *, struct class_interface *);
284 int (*add_dev) (struct device *, struct class_interface *);
285 void (*remove_dev) (struct device *, struct class_interface *);
288 extern int __must_check class_interface_register(struct class_interface *);
289 extern void class_interface_unregister(struct class_interface *);
291 extern struct class *class_create(struct module *owner, const char *name);
292 extern void class_destroy(struct class *cls);
293 extern struct class_device *class_device_create(struct class *cls,
294 struct class_device *parent,
296 struct device *device,
297 const char *fmt, ...)
298 __attribute__((format(printf,5,6)));
299 extern void class_device_destroy(struct class *cls, dev_t devt);
301 /* interface for exporting device attributes */
302 struct device_attribute {
303 struct attribute attr;
304 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
306 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
307 const char *buf, size_t count);
310 #define DEVICE_ATTR(_name,_mode,_show,_store) \
311 struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
313 extern int __must_check device_create_file(struct device *device,
314 struct device_attribute * entry);
315 extern void device_remove_file(struct device * dev, struct device_attribute * attr);
316 extern int __must_check device_create_bin_file(struct device *dev,
317 struct bin_attribute *attr);
318 extern void device_remove_bin_file(struct device *dev,
319 struct bin_attribute *attr);
321 struct klist klist_children;
322 struct klist_node knode_parent; /* node in sibling list */
323 struct klist_node knode_driver;
324 struct klist_node knode_bus;
325 struct device * parent;
328 char bus_id[BUS_ID_SIZE]; /* position on parent bus */
329 struct device_attribute uevent_attr;
330 struct device_attribute *devt_attr;
332 struct semaphore sem; /* semaphore to synchronize calls to
336 struct bus_type * bus; /* type of bus device is on */
337 struct device_driver *driver; /* which driver has allocated this
339 void *driver_data; /* data private to the driver */
340 void *platform_data; /* Platform specific data, device
341 core doesn't touch it */
342 void *firmware_data; /* Firmware specific data (e.g. ACPI,
343 BIOS data),reserved for device core*/
344 struct dev_pm_info power;
346 u64 *dma_mask; /* dma mask (if dma'able device) */
347 u64 coherent_dma_mask;/* Like dma_mask, but for
348 alloc_coherent mappings as
349 not all hardware supports
350 64 bit addresses for consistent
351 allocations such descriptors. */
353 struct list_head dma_pools; /* dma pools (if dma'ble) */
355 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
358 /* class_device migration path */
359 struct list_head node;
360 struct class *class; /* optional*/
361 dev_t devt; /* dev_t, creates the sysfs "dev" */
362 struct attribute_group **groups; /* optional groups */
364 void (*release)(struct device * dev);
368 dev_get_drvdata (struct device *dev)
370 return dev->driver_data;
374 dev_set_drvdata (struct device *dev, void *data)
376 dev->driver_data = data;
379 static inline int device_is_registered(struct device *dev)
381 return klist_node_attached(&dev->knode_bus);
385 * High level routines for use by the bus drivers
387 extern int __must_check device_register(struct device * dev);
388 extern void device_unregister(struct device * dev);
389 extern void device_initialize(struct device * dev);
390 extern int __must_check device_add(struct device * dev);
391 extern void device_del(struct device * dev);
392 extern int __must_check device_for_each_child(struct device *, void *,
393 int (*fn)(struct device *, void *));
394 extern int device_rename(struct device *dev, char *new_name);
397 * Manual binding of a device to driver. See drivers/base/bus.c
398 * for information on use.
400 extern void device_bind_driver(struct device * dev);
401 extern void device_release_driver(struct device * dev);
402 extern int __must_check device_attach(struct device * dev);
403 extern void driver_attach(struct device_driver * drv);
404 extern void device_reprobe(struct device *dev);
407 * Easy functions for dynamically creating devices on the fly
409 extern struct device *device_create(struct class *cls, struct device *parent,
410 dev_t devt, const char *fmt, ...)
411 __attribute__((format(printf,4,5)));
412 extern void device_destroy(struct class *cls, dev_t devt);
414 extern int virtual_device_parent(struct device *dev);
417 * Platform "fixup" functions - allow the platform to have their say
418 * about devices and actions that the general device layer doesn't
421 /* Notify platform of device discovery */
422 extern int (*platform_notify)(struct device * dev);
424 extern int (*platform_notify_remove)(struct device * dev);
428 * get_device - atomically increment the reference count for the device.
431 extern struct device * get_device(struct device * dev);
432 extern void put_device(struct device * dev);
435 /* drivers/base/power/shutdown.c */
436 extern void device_shutdown(void);
439 /* drivers/base/firmware.c */
440 extern int __must_check firmware_register(struct subsystem *);
441 extern void firmware_unregister(struct subsystem *);
443 /* debugging and troubleshooting/diagnostic helpers. */
444 extern const char *dev_driver_string(struct device *dev);
445 #define dev_printk(level, dev, format, arg...) \
446 printk(level "%s %s: " format , dev_driver_string(dev) , (dev)->bus_id , ## arg)
449 #define dev_dbg(dev, format, arg...) \
450 dev_printk(KERN_DEBUG , dev , format , ## arg)
452 #define dev_dbg(dev, format, arg...) do { (void)(dev); } while (0)
455 #define dev_err(dev, format, arg...) \
456 dev_printk(KERN_ERR , dev , format , ## arg)
457 #define dev_info(dev, format, arg...) \
458 dev_printk(KERN_INFO , dev , format , ## arg)
459 #define dev_warn(dev, format, arg...) \
460 dev_printk(KERN_WARNING , dev , format , ## arg)
461 #define dev_notice(dev, format, arg...) \
462 dev_printk(KERN_NOTICE , dev , format , ## arg)
464 /* Create alias, so I can be autoloaded. */
465 #define MODULE_ALIAS_CHARDEV(major,minor) \
466 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
467 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
468 MODULE_ALIAS("char-major-" __stringify(major) "-*")
469 #endif /* _DEVICE_H_ */