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/list.h>
18 #include <linux/spinlock.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
53 struct subsystem subsys;
57 struct bus_attribute * bus_attrs;
58 struct device_attribute * dev_attrs;
59 struct driver_attribute * drv_attrs;
61 int (*match)(struct device * dev, struct device_driver * drv);
62 struct device * (*add) (struct device * parent, char * bus_id);
63 int (*hotplug) (struct device *dev, char **envp,
64 int num_envp, char *buffer, int buffer_size);
65 int (*suspend)(struct device * dev, u32 state);
66 int (*resume)(struct device * dev);
69 extern int bus_register(struct bus_type * bus);
70 extern void bus_unregister(struct bus_type * bus);
72 extern int bus_rescan_devices(struct bus_type * bus);
74 extern struct bus_type * get_bus(struct bus_type * bus);
75 extern void put_bus(struct bus_type * bus);
77 extern struct bus_type * find_bus(char * name);
79 /* iterator helpers for buses */
81 int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data,
82 int (*fn)(struct device *, void *));
84 int bus_for_each_drv(struct bus_type * bus, struct device_driver * start,
85 void * data, int (*fn)(struct device_driver *, void *));
88 /* driverfs interface for exporting bus attributes */
90 struct bus_attribute {
91 struct attribute attr;
92 ssize_t (*show)(struct bus_type *, char * buf);
93 ssize_t (*store)(struct bus_type *, const char * buf, size_t count);
96 #define BUS_ATTR(_name,_mode,_show,_store) \
97 struct bus_attribute bus_attr_##_name = __ATTR(_name,_mode,_show,_store)
99 extern int bus_create_file(struct bus_type *, struct bus_attribute *);
100 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
102 struct device_driver {
104 struct bus_type * bus;
106 struct semaphore unload_sem;
108 struct list_head devices;
110 int (*probe) (struct device * dev);
111 int (*remove) (struct device * dev);
112 void (*shutdown) (struct device * dev);
113 int (*suspend) (struct device * dev, u32 state, u32 level);
114 int (*resume) (struct device * dev, u32 level);
118 extern int driver_register(struct device_driver * drv);
119 extern void driver_unregister(struct device_driver * drv);
121 extern struct device_driver * get_driver(struct device_driver * drv);
122 extern void put_driver(struct device_driver * drv);
123 extern struct device_driver *driver_find(const char *name, struct bus_type *bus);
126 /* driverfs interface for exporting driver attributes */
128 struct driver_attribute {
129 struct attribute attr;
130 ssize_t (*show)(struct device_driver *, char * buf);
131 ssize_t (*store)(struct device_driver *, const char * buf, size_t count);
134 #define DRIVER_ATTR(_name,_mode,_show,_store) \
135 struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store)
137 extern int driver_create_file(struct device_driver *, struct driver_attribute *);
138 extern void driver_remove_file(struct device_driver *, struct driver_attribute *);
147 struct subsystem subsys;
148 struct list_head children;
149 struct list_head interfaces;
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 *);
181 struct class_device {
182 struct list_head node;
185 struct class * class; /* required */
186 struct device * dev; /* not necessary, but nice to have */
187 void * class_data; /* class-specific data */
189 char class_id[BUS_ID_SIZE]; /* unique to this class */
193 class_get_devdata (struct class_device *dev)
195 return dev->class_data;
199 class_set_devdata (struct class_device *dev, void *data)
201 dev->class_data = data;
205 extern int class_device_register(struct class_device *);
206 extern void class_device_unregister(struct class_device *);
207 extern void class_device_initialize(struct class_device *);
208 extern int class_device_add(struct class_device *);
209 extern void class_device_del(struct class_device *);
211 extern int class_device_rename(struct class_device *, char *);
213 extern struct class_device * class_device_get(struct class_device *);
214 extern void class_device_put(struct class_device *);
216 struct class_device_attribute {
217 struct attribute attr;
218 ssize_t (*show)(struct class_device *, char * buf);
219 ssize_t (*store)(struct class_device *, const char * buf, size_t count);
222 #define CLASS_DEVICE_ATTR(_name,_mode,_show,_store) \
223 struct class_device_attribute class_device_attr_##_name = \
224 __ATTR(_name,_mode,_show,_store)
226 extern int class_device_create_file(struct class_device *,
227 const struct class_device_attribute *);
228 extern void class_device_remove_file(struct class_device *,
229 const struct class_device_attribute *);
232 struct class_interface {
233 struct list_head node;
236 int (*add) (struct class_device *);
237 void (*remove) (struct class_device *);
240 extern int class_interface_register(struct class_interface *);
241 extern void class_interface_unregister(struct class_interface *);
243 /* interface for class simple stuff */
244 extern struct class_simple *class_simple_create(struct module *owner, char *name);
245 extern void class_simple_destroy(struct class_simple *cs);
246 extern struct class_device *class_simple_device_add(struct class_simple *cs, dev_t dev, struct device *device, const char *fmt, ...)
247 __attribute__((format(printf,4,5)));
248 extern int class_simple_set_hotplug(struct class_simple *,
249 int (*hotplug)(struct class_device *dev, char **envp, int num_envp, char *buffer, int buffer_size));
250 extern void class_simple_device_remove(dev_t dev);
254 struct list_head node; /* node in sibling list */
255 struct list_head bus_list; /* node in bus's list */
256 struct list_head driver_list;
257 struct list_head children;
258 struct device * parent;
261 char bus_id[BUS_ID_SIZE]; /* position on parent bus */
263 struct bus_type * bus; /* type of bus device is on */
264 struct device_driver *driver; /* which driver has allocated this
266 void *driver_data; /* data private to the driver */
267 void *platform_data; /* Platform specific data (e.g. ACPI,
268 BIOS data relevant to device) */
269 struct dev_pm_info power;
270 u32 power_state; /* Current operating state. In
271 ACPI-speak, this is D0-D3, D0
272 being fully functional, and D3
275 unsigned char *saved_state; /* saved device state */
276 u32 detach_state; /* State to enter when device is
277 detached from its driver. */
279 u64 *dma_mask; /* dma mask (if dma'able device) */
280 u64 coherent_dma_mask;/* Like dma_mask, but for
281 alloc_coherent mappings as
282 not all hardware supports
283 64 bit addresses for consistent
284 allocations such descriptors. */
286 struct list_head dma_pools; /* dma pools (if dma'ble) */
288 void (*release)(struct device * dev);
291 static inline struct device *
292 list_to_dev(struct list_head *node)
294 return list_entry(node, struct device, node);
298 dev_get_drvdata (struct device *dev)
300 return dev->driver_data;
304 dev_set_drvdata (struct device *dev, void *data)
306 dev->driver_data = data;
310 * High level routines for use by the bus drivers
312 extern int device_register(struct device * dev);
313 extern void device_unregister(struct device * dev);
314 extern void device_initialize(struct device * dev);
315 extern int device_add(struct device * dev);
316 extern void device_del(struct device * dev);
317 extern int device_for_each_child(struct device *, void *,
318 int (*fn)(struct device *, void *));
321 * Manual binding of a device to driver. See drivers/base/bus.c
322 * for information on use.
324 extern void device_bind_driver(struct device * dev);
325 extern void device_release_driver(struct device * dev);
326 extern void driver_attach(struct device_driver * drv);
329 /* driverfs interface for exporting device attributes */
331 struct device_attribute {
332 struct attribute attr;
333 ssize_t (*show)(struct device * dev, char * buf);
334 ssize_t (*store)(struct device * dev, const char * buf, size_t count);
337 #define DEVICE_ATTR(_name,_mode,_show,_store) \
338 struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
341 extern int device_create_file(struct device *device, struct device_attribute * entry);
342 extern void device_remove_file(struct device * dev, struct device_attribute * attr);
345 * Platform "fixup" functions - allow the platform to have their say
346 * about devices and actions that the general device layer doesn't
349 /* Notify platform of device discovery */
350 extern int (*platform_notify)(struct device * dev);
352 extern int (*platform_notify_remove)(struct device * dev);
356 * get_device - atomically increment the reference count for the device.
359 extern struct device * get_device(struct device * dev);
360 extern void put_device(struct device * dev);
361 extern struct device *device_find(const char *name, struct bus_type *bus);
364 /* drivers/base/platform.c */
366 struct platform_device {
371 struct resource * resource;
374 #define to_platform_device(x) container_of((x), struct platform_device, dev)
376 extern int platform_device_register(struct platform_device *);
377 extern void platform_device_unregister(struct platform_device *);
379 extern struct bus_type platform_bus_type;
380 extern struct device platform_bus;
382 extern struct resource *platform_get_resource(struct platform_device *, unsigned int, unsigned int);
383 extern int platform_get_irq(struct platform_device *, unsigned int);
384 extern int platform_add_devices(struct platform_device **, int);
386 extern struct platform_device *platform_device_register_simple(char *, unsigned int, struct resource *, unsigned int);
388 /* drivers/base/power.c */
389 extern void device_shutdown(void);
392 /* drivers/base/firmware.c */
393 extern int firmware_register(struct subsystem *);
394 extern void firmware_unregister(struct subsystem *);
396 /* debugging and troubleshooting/diagnostic helpers. */
397 #define dev_printk(level, dev, format, arg...) \
398 printk(level "%s %s: " format , (dev)->driver ? (dev)->driver->name : "" , (dev)->bus_id , ## arg)
401 #define dev_dbg(dev, format, arg...) \
402 dev_printk(KERN_DEBUG , dev , format , ## arg)
404 #define dev_dbg(dev, format, arg...) do { (void)(dev); } while (0)
407 #define dev_err(dev, format, arg...) \
408 dev_printk(KERN_ERR , dev , format , ## arg)
409 #define dev_info(dev, format, arg...) \
410 dev_printk(KERN_INFO , dev , format , ## arg)
411 #define dev_warn(dev, format, arg...) \
412 dev_printk(KERN_WARNING , dev , format , ## arg)
414 /* Create alias, so I can be autoloaded. */
415 #define MODULE_ALIAS_CHARDEV(major,minor) \
416 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
417 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
418 MODULE_ALIAS("char-major-" __stringify(major) "-*")
419 #endif /* _DEVICE_H_ */