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_prepare)(struct device * dev, pm_message_t state);
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 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 bus_for_each_drv(struct bus_type * bus, struct device_driver * start,
75 void * data, 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 bus_create_file(struct bus_type *, struct bus_attribute *);
90 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
92 struct device_driver {
94 struct bus_type * bus;
96 struct completion unloaded;
98 struct klist klist_devices;
99 struct klist_node knode_bus;
101 struct module * owner;
103 int (*probe) (struct device * dev);
104 int (*remove) (struct device * dev);
105 void (*shutdown) (struct device * dev);
106 int (*suspend) (struct device * dev, pm_message_t state);
107 int (*resume) (struct device * dev);
111 extern int driver_register(struct device_driver * drv);
112 extern void driver_unregister(struct device_driver * drv);
114 extern struct device_driver * get_driver(struct device_driver * drv);
115 extern void put_driver(struct device_driver * drv);
116 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 driver_create_file(struct device_driver *, struct driver_attribute *);
131 extern void driver_remove_file(struct device_driver *, struct driver_attribute *);
133 extern int driver_for_each_device(struct device_driver * drv, struct device * start,
134 void * data, int (*fn)(struct device *, void *));
135 struct device * driver_find_device(struct device_driver *drv,
136 struct device *start, void *data,
137 int (*match)(struct device *, void *));
145 struct module * owner;
147 struct subsystem subsys;
148 struct list_head children;
149 struct list_head devices;
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);
162 int (*suspend)(struct device *, pm_message_t state);
163 int (*resume)(struct device *);
166 extern int class_register(struct class *);
167 extern void class_unregister(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, const 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,
287 const char *fmt, ...)
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;
316 struct device_attribute *devt_attr;
318 struct semaphore sem; /* semaphore to synchronize calls to
322 struct bus_type * bus; /* type of bus device is on */
323 struct device_driver *driver; /* which driver has allocated this
325 void *driver_data; /* data private to the driver */
326 void *platform_data; /* Platform specific data, device
327 core doesn't touch it */
328 void *firmware_data; /* Firmware specific data (e.g. ACPI,
329 BIOS data),reserved for device core*/
330 struct dev_pm_info power;
332 u64 *dma_mask; /* dma mask (if dma'able device) */
333 u64 coherent_dma_mask;/* Like dma_mask, but for
334 alloc_coherent mappings as
335 not all hardware supports
336 64 bit addresses for consistent
337 allocations such descriptors. */
339 struct list_head dma_pools; /* dma pools (if dma'ble) */
341 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
344 /* class_device migration path */
345 struct list_head node;
346 struct class *class; /* optional*/
347 dev_t devt; /* dev_t, creates the sysfs "dev" */
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_ */