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 kobject *virtual_dir;
154 struct class_attribute * class_attrs;
155 struct class_device_attribute * class_dev_attrs;
156 struct device_attribute * dev_attrs;
158 int (*uevent)(struct class_device *dev, char **envp,
159 int num_envp, char *buffer, int buffer_size);
160 int (*dev_uevent)(struct device *dev, char **envp, int num_envp,
161 char *buffer, int buffer_size);
163 void (*release)(struct class_device *dev);
164 void (*class_release)(struct class *class);
165 void (*dev_release)(struct device *dev);
167 int (*suspend)(struct device *, pm_message_t state);
168 int (*resume)(struct device *);
171 extern int class_register(struct class *);
172 extern void class_unregister(struct class *);
175 struct class_attribute {
176 struct attribute attr;
177 ssize_t (*show)(struct class *, char * buf);
178 ssize_t (*store)(struct class *, const char * buf, size_t count);
181 #define CLASS_ATTR(_name,_mode,_show,_store) \
182 struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
184 extern int class_create_file(struct class *, const struct class_attribute *);
185 extern void class_remove_file(struct class *, const struct class_attribute *);
187 struct class_device_attribute {
188 struct attribute attr;
189 ssize_t (*show)(struct class_device *, char * buf);
190 ssize_t (*store)(struct class_device *, const char * buf, size_t count);
193 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store) \
194 struct class_device_attribute class_device_attr_##_name = \
195 __ATTR(_name,_mode,_show,_store)
197 extern int class_device_create_file(struct class_device *,
198 const struct class_device_attribute *);
201 * struct class_device - class devices
202 * @class: pointer to the parent class for this class device. This is required.
203 * @devt: for internal use by the driver core only.
204 * @node: for internal use by the driver core only.
205 * @kobj: for internal use by the driver core only.
206 * @devt_attr: for internal use by the driver core only.
207 * @groups: optional additional groups to be created
208 * @dev: if set, a symlink to the struct device is created in the sysfs
209 * directory for this struct class device.
210 * @class_data: pointer to whatever you want to store here for this struct
211 * class_device. Use class_get_devdata() and class_set_devdata() to get and
213 * @parent: pointer to a struct class_device that is the parent of this struct
214 * class_device. If NULL, this class_device will show up at the root of the
215 * struct class in sysfs (which is probably what you want to have happen.)
216 * @release: pointer to a release function for this struct class_device. If
217 * set, this will be called instead of the class specific release function.
218 * Only use this if you want to override the default release function, like
219 * when you are nesting class_device structures.
220 * @uevent: pointer to a uevent function for this struct class_device. If
221 * set, this will be called instead of the class specific uevent function.
222 * Only use this if you want to override the default uevent function, like
223 * when you are nesting class_device structures.
225 struct class_device {
226 struct list_head node;
229 struct class * class; /* required */
230 dev_t devt; /* dev_t, creates the sysfs "dev" */
231 struct class_device_attribute *devt_attr;
232 struct class_device_attribute uevent_attr;
233 struct device * dev; /* not necessary, but nice to have */
234 void * class_data; /* class-specific data */
235 struct class_device *parent; /* parent of this child device, if there is one */
236 struct attribute_group ** groups; /* optional groups */
238 void (*release)(struct class_device *dev);
239 int (*uevent)(struct class_device *dev, char **envp,
240 int num_envp, char *buffer, int buffer_size);
241 char class_id[BUS_ID_SIZE]; /* unique to this class */
245 class_get_devdata (struct class_device *dev)
247 return dev->class_data;
251 class_set_devdata (struct class_device *dev, void *data)
253 dev->class_data = data;
257 extern int class_device_register(struct class_device *);
258 extern void class_device_unregister(struct class_device *);
259 extern void class_device_initialize(struct class_device *);
260 extern int class_device_add(struct class_device *);
261 extern void class_device_del(struct class_device *);
263 extern int class_device_rename(struct class_device *, char *);
265 extern struct class_device * class_device_get(struct class_device *);
266 extern void class_device_put(struct class_device *);
268 extern void class_device_remove_file(struct class_device *,
269 const struct class_device_attribute *);
270 extern int class_device_create_bin_file(struct class_device *,
271 struct bin_attribute *);
272 extern void class_device_remove_bin_file(struct class_device *,
273 struct bin_attribute *);
275 struct class_interface {
276 struct list_head node;
279 int (*add) (struct class_device *, struct class_interface *);
280 void (*remove) (struct class_device *, struct class_interface *);
283 extern int class_interface_register(struct class_interface *);
284 extern void class_interface_unregister(struct class_interface *);
286 extern struct class *class_create(struct module *owner, const char *name);
287 extern void class_destroy(struct class *cls);
288 extern struct class_device *class_device_create(struct class *cls,
289 struct class_device *parent,
291 struct device *device,
292 const char *fmt, ...)
293 __attribute__((format(printf,5,6)));
294 extern void class_device_destroy(struct class *cls, dev_t devt);
296 /* interface for exporting device attributes */
297 struct device_attribute {
298 struct attribute attr;
299 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
301 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
302 const char *buf, size_t count);
305 #define DEVICE_ATTR(_name,_mode,_show,_store) \
306 struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
308 extern int device_create_file(struct device *device, struct device_attribute * entry);
309 extern void device_remove_file(struct device * dev, struct device_attribute * attr);
311 struct klist klist_children;
312 struct klist_node knode_parent; /* node in sibling list */
313 struct klist_node knode_driver;
314 struct klist_node knode_bus;
315 struct device * parent;
318 char bus_id[BUS_ID_SIZE]; /* position on parent bus */
319 struct device_attribute uevent_attr;
320 struct device_attribute *devt_attr;
322 struct semaphore sem; /* semaphore to synchronize calls to
326 struct bus_type * bus; /* type of bus device is on */
327 struct device_driver *driver; /* which driver has allocated this
329 void *driver_data; /* data private to the driver */
330 void *platform_data; /* Platform specific data, device
331 core doesn't touch it */
332 void *firmware_data; /* Firmware specific data (e.g. ACPI,
333 BIOS data),reserved for device core*/
334 struct dev_pm_info power;
336 u64 *dma_mask; /* dma mask (if dma'able device) */
337 u64 coherent_dma_mask;/* Like dma_mask, but for
338 alloc_coherent mappings as
339 not all hardware supports
340 64 bit addresses for consistent
341 allocations such descriptors. */
343 struct list_head dma_pools; /* dma pools (if dma'ble) */
345 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
348 /* class_device migration path */
349 struct list_head node;
350 struct class *class; /* optional*/
351 dev_t devt; /* dev_t, creates the sysfs "dev" */
352 struct attribute_group **groups; /* optional groups */
354 void (*release)(struct device * dev);
358 dev_get_drvdata (struct device *dev)
360 return dev->driver_data;
364 dev_set_drvdata (struct device *dev, void *data)
366 dev->driver_data = data;
369 static inline int device_is_registered(struct device *dev)
371 return klist_node_attached(&dev->knode_bus);
375 * High level routines for use by the bus drivers
377 extern int device_register(struct device * dev);
378 extern void device_unregister(struct device * dev);
379 extern void device_initialize(struct device * dev);
380 extern int device_add(struct device * dev);
381 extern void device_del(struct device * dev);
382 extern int device_for_each_child(struct device *, void *,
383 int (*fn)(struct device *, void *));
384 extern int device_rename(struct device *dev, char *new_name);
387 * Manual binding of a device to driver. See drivers/base/bus.c
388 * for information on use.
390 extern void device_bind_driver(struct device * dev);
391 extern void device_release_driver(struct device * dev);
392 extern int device_attach(struct device * dev);
393 extern void driver_attach(struct device_driver * drv);
394 extern void device_reprobe(struct device *dev);
397 * Easy functions for dynamically creating devices on the fly
399 extern struct device *device_create(struct class *cls, struct device *parent,
400 dev_t devt, const char *fmt, ...)
401 __attribute__((format(printf,4,5)));
402 extern void device_destroy(struct class *cls, dev_t devt);
404 extern int virtual_device_parent(struct device *dev);
407 * Platform "fixup" functions - allow the platform to have their say
408 * about devices and actions that the general device layer doesn't
411 /* Notify platform of device discovery */
412 extern int (*platform_notify)(struct device * dev);
414 extern int (*platform_notify_remove)(struct device * dev);
418 * get_device - atomically increment the reference count for the device.
421 extern struct device * get_device(struct device * dev);
422 extern void put_device(struct device * dev);
425 /* drivers/base/power/shutdown.c */
426 extern void device_shutdown(void);
429 /* drivers/base/firmware.c */
430 extern int firmware_register(struct subsystem *);
431 extern void firmware_unregister(struct subsystem *);
433 /* debugging and troubleshooting/diagnostic helpers. */
434 extern const char *dev_driver_string(struct device *dev);
435 #define dev_printk(level, dev, format, arg...) \
436 printk(level "%s %s: " format , dev_driver_string(dev) , (dev)->bus_id , ## arg)
439 #define dev_dbg(dev, format, arg...) \
440 dev_printk(KERN_DEBUG , dev , format , ## arg)
442 #define dev_dbg(dev, format, arg...) do { (void)(dev); } while (0)
445 #define dev_err(dev, format, arg...) \
446 dev_printk(KERN_ERR , dev , format , ## arg)
447 #define dev_info(dev, format, arg...) \
448 dev_printk(KERN_INFO , dev , format , ## arg)
449 #define dev_warn(dev, format, arg...) \
450 dev_printk(KERN_WARNING , dev , format , ## arg)
451 #define dev_notice(dev, format, arg...) \
452 dev_printk(KERN_NOTICE , dev , format , ## arg)
454 /* Create alias, so I can be autoloaded. */
455 #define MODULE_ALIAS_CHARDEV(major,minor) \
456 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
457 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
458 MODULE_ALIAS("char-major-" __stringify(major) "-*")
459 #endif /* _DEVICE_H_ */