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/config.h>
15 #include <linux/ioport.h>
16 #include <linux/kobject.h>
17 #include <linux/klist.h>
18 #include <linux/list.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 (*hotplug) (struct device *dev, char **envp,
51 int num_envp, char *buffer, int buffer_size);
52 int (*suspend)(struct device * dev, pm_message_t state);
53 int (*resume)(struct device * dev);
56 extern int bus_register(struct bus_type * bus);
57 extern void bus_unregister(struct bus_type * bus);
59 extern void bus_rescan_devices(struct bus_type * bus);
61 extern struct bus_type * get_bus(struct bus_type * bus);
62 extern void put_bus(struct bus_type * bus);
64 extern struct bus_type * find_bus(char * name);
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 interfaces;
149 struct semaphore sem; /* locks both the children and interfaces lists */
151 struct class_attribute * class_attrs;
152 struct class_device_attribute * class_dev_attrs;
154 int (*hotplug)(struct class_device *dev, char **envp,
155 int num_envp, char *buffer, int buffer_size);
157 void (*release)(struct class_device *dev);
158 void (*class_release)(struct class *class);
161 extern int class_register(struct class *);
162 extern void class_unregister(struct class *);
164 extern struct class * class_get(struct class *);
165 extern void class_put(struct class *);
168 struct class_attribute {
169 struct attribute attr;
170 ssize_t (*show)(struct class *, char * buf);
171 ssize_t (*store)(struct class *, const char * buf, size_t count);
174 #define CLASS_ATTR(_name,_mode,_show,_store) \
175 struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
177 extern int class_create_file(struct class *, const struct class_attribute *);
178 extern void class_remove_file(struct class *, const struct class_attribute *);
180 struct class_device_attribute {
181 struct attribute attr;
182 ssize_t (*show)(struct class_device *, char * buf);
183 ssize_t (*store)(struct class_device *, const char * buf, size_t count);
186 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store) \
187 struct class_device_attribute class_device_attr_##_name = \
188 __ATTR(_name,_mode,_show,_store)
190 extern int class_device_create_file(struct class_device *,
191 const struct class_device_attribute *);
194 * struct class_device - class devices
195 * @class: pointer to the parent class for this class device. This is required.
196 * @devt: for internal use by the driver core only.
197 * @node: for internal use by the driver core only.
198 * @kobj: for internal use by the driver core only.
199 * @devt_attr: for internal use by the driver core only.
200 * @dev: if set, a symlink to the struct device is created in the sysfs
201 * directory for this struct class device.
202 * @class_data: pointer to whatever you want to store here for this struct
203 * class_device. Use class_get_devdata() and class_set_devdata() to get and
205 * @parent: pointer to a struct class_device that is the parent of this struct
206 * class_device. If NULL, this class_device will show up at the root of the
207 * struct class in sysfs (which is probably what you want to have happen.)
208 * @release: pointer to a release function for this struct class_device. If
209 * set, this will be called instead of the class specific release function.
210 * Only use this if you want to override the default release function, like
211 * when you are nesting class_device structures.
212 * @hotplug: pointer to a hotplug function for this struct class_device. If
213 * set, this will be called instead of the class specific hotplug function.
214 * Only use this if you want to override the default hotplug function, like
215 * when you are nesting class_device structures.
217 struct class_device {
218 struct list_head node;
221 struct class * class; /* required */
222 dev_t devt; /* dev_t, creates the sysfs "dev" */
223 struct class_device_attribute *devt_attr;
224 struct class_device_attribute uevent_attr;
225 struct device * dev; /* not necessary, but nice to have */
226 void * class_data; /* class-specific data */
227 struct class_device *parent; /* parent of this child device, if there is one */
229 void (*release)(struct class_device *dev);
230 int (*hotplug)(struct class_device *dev, char **envp,
231 int num_envp, char *buffer, int buffer_size);
232 char class_id[BUS_ID_SIZE]; /* unique to this class */
236 class_get_devdata (struct class_device *dev)
238 return dev->class_data;
242 class_set_devdata (struct class_device *dev, void *data)
244 dev->class_data = data;
248 extern int class_device_register(struct class_device *);
249 extern void class_device_unregister(struct class_device *);
250 extern void class_device_initialize(struct class_device *);
251 extern int class_device_add(struct class_device *);
252 extern void class_device_del(struct class_device *);
254 extern int class_device_rename(struct class_device *, char *);
256 extern struct class_device * class_device_get(struct class_device *);
257 extern void class_device_put(struct class_device *);
259 extern void class_device_remove_file(struct class_device *,
260 const struct class_device_attribute *);
261 extern int class_device_create_bin_file(struct class_device *,
262 struct bin_attribute *);
263 extern void class_device_remove_bin_file(struct class_device *,
264 struct bin_attribute *);
266 struct class_interface {
267 struct list_head node;
270 int (*add) (struct class_device *, struct class_interface *);
271 void (*remove) (struct class_device *, struct class_interface *);
274 extern int class_interface_register(struct class_interface *);
275 extern void class_interface_unregister(struct class_interface *);
277 extern struct class *class_create(struct module *owner, char *name);
278 extern void class_destroy(struct class *cls);
279 extern struct class_device *class_device_create(struct class *cls,
280 struct class_device *parent,
282 struct device *device,
284 __attribute__((format(printf,5,6)));
285 extern void class_device_destroy(struct class *cls, dev_t devt);
288 /* interface for exporting device attributes */
289 struct device_attribute {
290 struct attribute attr;
291 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
293 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
294 const char *buf, size_t count);
297 #define DEVICE_ATTR(_name,_mode,_show,_store) \
298 struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
300 extern int device_create_file(struct device *device, struct device_attribute * entry);
301 extern void device_remove_file(struct device * dev, struct device_attribute * attr);
303 struct klist klist_children;
304 struct klist_node knode_parent; /* node in sibling list */
305 struct klist_node knode_driver;
306 struct klist_node knode_bus;
307 struct device * parent;
310 char bus_id[BUS_ID_SIZE]; /* position on parent bus */
311 struct device_attribute uevent_attr;
313 struct semaphore sem; /* semaphore to synchronize calls to
317 struct bus_type * bus; /* type of bus device is on */
318 struct device_driver *driver; /* which driver has allocated this
320 void *driver_data; /* data private to the driver */
321 void *platform_data; /* Platform specific data, device
322 core doesn't touch it */
323 void *firmware_data; /* Firmware specific data (e.g. ACPI,
324 BIOS data),reserved for device core*/
325 struct dev_pm_info power;
327 u64 *dma_mask; /* dma mask (if dma'able device) */
328 u64 coherent_dma_mask;/* Like dma_mask, but for
329 alloc_coherent mappings as
330 not all hardware supports
331 64 bit addresses for consistent
332 allocations such descriptors. */
334 struct list_head dma_pools; /* dma pools (if dma'ble) */
336 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
339 void (*release)(struct device * dev);
343 dev_get_drvdata (struct device *dev)
345 return dev->driver_data;
349 dev_set_drvdata (struct device *dev, void *data)
351 dev->driver_data = data;
354 static inline int device_is_registered(struct device *dev)
356 return klist_node_attached(&dev->knode_bus);
360 * High level routines for use by the bus drivers
362 extern int device_register(struct device * dev);
363 extern void device_unregister(struct device * dev);
364 extern void device_initialize(struct device * dev);
365 extern int device_add(struct device * dev);
366 extern void device_del(struct device * dev);
367 extern int device_for_each_child(struct device *, void *,
368 int (*fn)(struct device *, void *));
371 * Manual binding of a device to driver. See drivers/base/bus.c
372 * for information on use.
374 extern void device_bind_driver(struct device * dev);
375 extern void device_release_driver(struct device * dev);
376 extern int device_attach(struct device * dev);
377 extern void driver_attach(struct device_driver * drv);
381 * Platform "fixup" functions - allow the platform to have their say
382 * about devices and actions that the general device layer doesn't
385 /* Notify platform of device discovery */
386 extern int (*platform_notify)(struct device * dev);
388 extern int (*platform_notify_remove)(struct device * dev);
392 * get_device - atomically increment the reference count for the device.
395 extern struct device * get_device(struct device * dev);
396 extern void put_device(struct device * dev);
399 /* drivers/base/power.c */
400 extern void device_shutdown(void);
403 /* drivers/base/firmware.c */
404 extern int firmware_register(struct subsystem *);
405 extern void firmware_unregister(struct subsystem *);
407 /* debugging and troubleshooting/diagnostic helpers. */
408 #define dev_printk(level, dev, format, arg...) \
409 printk(level "%s %s: " format , (dev)->driver ? (dev)->driver->name : "" , (dev)->bus_id , ## arg)
412 #define dev_dbg(dev, format, arg...) \
413 dev_printk(KERN_DEBUG , dev , format , ## arg)
415 #define dev_dbg(dev, format, arg...) do { (void)(dev); } while (0)
418 #define dev_err(dev, format, arg...) \
419 dev_printk(KERN_ERR , dev , format , ## arg)
420 #define dev_info(dev, format, arg...) \
421 dev_printk(KERN_INFO , dev , format , ## arg)
422 #define dev_warn(dev, format, arg...) \
423 dev_printk(KERN_WARNING , dev , format , ## arg)
425 /* Create alias, so I can be autoloaded. */
426 #define MODULE_ALIAS_CHARDEV(major,minor) \
427 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
428 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
429 MODULE_ALIAS("char-major-" __stringify(major) "-*")
430 #endif /* _DEVICE_H_ */