2 * device.h - generic, centralized driver model
4 * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
5 * Copyright (c) 2004-2007 Greg Kroah-Hartman <gregkh@suse.de>
7 * This file is released under the GPLv2
9 * See Documentation/driver-model/ for more information.
15 #include <linux/ioport.h>
16 #include <linux/kobject.h>
17 #include <linux/klist.h>
18 #include <linux/list.h>
19 #include <linux/compiler.h>
20 #include <linux/types.h>
21 #include <linux/module.h>
23 #include <linux/semaphore.h>
24 #include <asm/atomic.h>
25 #include <asm/device.h>
27 #define DEVICE_NAME_SIZE 50
28 /* DEVICE_NAME_HALF is really less than half to accommodate slop */
29 #define DEVICE_NAME_HALF __stringify(20)
30 #define DEVICE_ID_SIZE 32
31 #define BUS_ID_SIZE KOBJ_NAME_LEN
36 struct driver_private;
39 struct bus_type_private;
41 struct bus_attribute {
42 struct attribute attr;
43 ssize_t (*show)(struct bus_type *bus, char *buf);
44 ssize_t (*store)(struct bus_type *bus, const char *buf, size_t count);
47 #define BUS_ATTR(_name, _mode, _show, _store) \
48 struct bus_attribute bus_attr_##_name = __ATTR(_name, _mode, _show, _store)
50 extern int __must_check bus_create_file(struct bus_type *,
51 struct bus_attribute *);
52 extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
56 struct bus_attribute *bus_attrs;
57 struct device_attribute *dev_attrs;
58 struct driver_attribute *drv_attrs;
60 int (*match)(struct device *dev, struct device_driver *drv);
61 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
62 int (*probe)(struct device *dev);
63 int (*remove)(struct device *dev);
64 void (*shutdown)(struct device *dev);
66 int (*suspend)(struct device *dev, pm_message_t state);
67 int (*suspend_late)(struct device *dev, pm_message_t state);
68 int (*resume_early)(struct device *dev);
69 int (*resume)(struct device *dev);
71 struct bus_type_private *p;
74 extern int __must_check bus_register(struct bus_type *bus);
75 extern void bus_unregister(struct bus_type *bus);
77 extern int __must_check bus_rescan_devices(struct bus_type *bus);
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 *dev, void *data));
83 struct device *bus_find_device(struct bus_type *bus, struct device *start,
85 int (*match)(struct device *dev, void *data));
86 struct device *bus_find_device_by_name(struct bus_type *bus,
90 int __must_check bus_for_each_drv(struct bus_type *bus,
91 struct device_driver *start, void *data,
92 int (*fn)(struct device_driver *, void *));
95 * Bus notifiers: Get notified of addition/removal of devices
96 * and binding/unbinding of drivers to devices.
97 * In the long run, it should be a replacement for the platform
100 struct notifier_block;
102 extern int bus_register_notifier(struct bus_type *bus,
103 struct notifier_block *nb);
104 extern int bus_unregister_notifier(struct bus_type *bus,
105 struct notifier_block *nb);
107 /* All 4 notifers below get called with the target struct device *
108 * as an argument. Note that those functions are likely to be called
109 * with the device semaphore held in the core, so be careful.
111 #define BUS_NOTIFY_ADD_DEVICE 0x00000001 /* device added */
112 #define BUS_NOTIFY_DEL_DEVICE 0x00000002 /* device removed */
113 #define BUS_NOTIFY_BOUND_DRIVER 0x00000003 /* driver bound to device */
114 #define BUS_NOTIFY_UNBIND_DRIVER 0x00000004 /* driver about to be
117 extern struct kset *bus_get_kset(struct bus_type *bus);
118 extern struct klist *bus_get_device_klist(struct bus_type *bus);
120 struct device_driver {
122 struct bus_type *bus;
124 struct module *owner;
125 const char *mod_name; /* used for built-in modules */
127 int (*probe) (struct device *dev);
128 int (*remove) (struct device *dev);
129 void (*shutdown) (struct device *dev);
130 int (*suspend) (struct device *dev, pm_message_t state);
131 int (*resume) (struct device *dev);
132 struct attribute_group **groups;
134 struct driver_private *p;
138 extern int __must_check driver_register(struct device_driver *drv);
139 extern void driver_unregister(struct device_driver *drv);
141 extern struct device_driver *get_driver(struct device_driver *drv);
142 extern void put_driver(struct device_driver *drv);
143 extern struct device_driver *driver_find(const char *name,
144 struct bus_type *bus);
145 extern int driver_probe_done(void);
147 /* sysfs interface for exporting driver attributes */
149 struct driver_attribute {
150 struct attribute attr;
151 ssize_t (*show)(struct device_driver *driver, char *buf);
152 ssize_t (*store)(struct device_driver *driver, const char *buf,
156 #define DRIVER_ATTR(_name, _mode, _show, _store) \
157 struct driver_attribute driver_attr_##_name = \
158 __ATTR(_name, _mode, _show, _store)
160 extern int __must_check driver_create_file(struct device_driver *driver,
161 struct driver_attribute *attr);
162 extern void driver_remove_file(struct device_driver *driver,
163 struct driver_attribute *attr);
165 extern int __must_check driver_add_kobj(struct device_driver *drv,
166 struct kobject *kobj,
167 const char *fmt, ...);
169 extern int __must_check driver_for_each_device(struct device_driver *drv,
170 struct device *start,
172 int (*fn)(struct device *dev,
174 struct device *driver_find_device(struct device_driver *drv,
175 struct device *start, void *data,
176 int (*match)(struct device *dev, void *data));
183 struct module *owner;
186 struct list_head children;
187 struct list_head devices;
188 struct list_head interfaces;
189 struct kset class_dirs;
190 struct semaphore sem; /* locks children, devices, interfaces */
191 struct class_attribute *class_attrs;
192 struct device_attribute *dev_attrs;
194 int (*dev_uevent)(struct device *dev, struct kobj_uevent_env *env);
196 void (*class_release)(struct class *class);
197 void (*dev_release)(struct device *dev);
199 int (*suspend)(struct device *dev, pm_message_t state);
200 int (*resume)(struct device *dev);
203 extern int __must_check class_register(struct class *class);
204 extern void class_unregister(struct class *class);
205 extern int class_for_each_device(struct class *class, void *data,
206 int (*fn)(struct device *dev, void *data));
207 extern struct device *class_find_device(struct class *class, void *data,
208 int (*match)(struct device *, void *));
210 struct class_attribute {
211 struct attribute attr;
212 ssize_t (*show)(struct class *class, char *buf);
213 ssize_t (*store)(struct class *class, const char *buf, size_t count);
216 #define CLASS_ATTR(_name, _mode, _show, _store) \
217 struct class_attribute class_attr_##_name = __ATTR(_name, _mode, _show, _store)
219 extern int __must_check class_create_file(struct class *class,
220 const struct class_attribute *attr);
221 extern void class_remove_file(struct class *class,
222 const struct class_attribute *attr);
224 struct class_interface {
225 struct list_head node;
228 int (*add_dev) (struct device *, struct class_interface *);
229 void (*remove_dev) (struct device *, struct class_interface *);
232 extern int __must_check class_interface_register(struct class_interface *);
233 extern void class_interface_unregister(struct class_interface *);
235 extern struct class *class_create(struct module *owner, const char *name);
236 extern void class_destroy(struct class *cls);
239 * The type of device, "struct device" is embedded in. A class
240 * or bus can contain devices of different types
241 * like "partitions" and "disks", "mouse" and "event".
242 * This identifies the device type and carries type-specific
243 * information, equivalent to the kobj_type of a kobject.
244 * If "name" is specified, the uevent will contain it in
245 * the DEVTYPE variable.
249 struct attribute_group **groups;
250 int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
251 void (*release)(struct device *dev);
252 int (*suspend)(struct device *dev, pm_message_t state);
253 int (*resume)(struct device *dev);
256 /* interface for exporting device attributes */
257 struct device_attribute {
258 struct attribute attr;
259 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
261 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
262 const char *buf, size_t count);
265 #define DEVICE_ATTR(_name, _mode, _show, _store) \
266 struct device_attribute dev_attr_##_name = __ATTR(_name, _mode, _show, _store)
268 extern int __must_check device_create_file(struct device *device,
269 struct device_attribute *entry);
270 extern void device_remove_file(struct device *dev,
271 struct device_attribute *attr);
272 extern int __must_check device_create_bin_file(struct device *dev,
273 struct bin_attribute *attr);
274 extern void device_remove_bin_file(struct device *dev,
275 struct bin_attribute *attr);
276 extern int device_schedule_callback_owner(struct device *dev,
277 void (*func)(struct device *dev), struct module *owner);
279 /* This is a macro to avoid include problems with THIS_MODULE */
280 #define device_schedule_callback(dev, func) \
281 device_schedule_callback_owner(dev, func, THIS_MODULE)
283 /* device resource management */
284 typedef void (*dr_release_t)(struct device *dev, void *res);
285 typedef int (*dr_match_t)(struct device *dev, void *res, void *match_data);
287 #ifdef CONFIG_DEBUG_DEVRES
288 extern void *__devres_alloc(dr_release_t release, size_t size, gfp_t gfp,
290 #define devres_alloc(release, size, gfp) \
291 __devres_alloc(release, size, gfp, #release)
293 extern void *devres_alloc(dr_release_t release, size_t size, gfp_t gfp);
295 extern void devres_free(void *res);
296 extern void devres_add(struct device *dev, void *res);
297 extern void *devres_find(struct device *dev, dr_release_t release,
298 dr_match_t match, void *match_data);
299 extern void *devres_get(struct device *dev, void *new_res,
300 dr_match_t match, void *match_data);
301 extern void *devres_remove(struct device *dev, dr_release_t release,
302 dr_match_t match, void *match_data);
303 extern int devres_destroy(struct device *dev, dr_release_t release,
304 dr_match_t match, void *match_data);
307 extern void * __must_check devres_open_group(struct device *dev, void *id,
309 extern void devres_close_group(struct device *dev, void *id);
310 extern void devres_remove_group(struct device *dev, void *id);
311 extern int devres_release_group(struct device *dev, void *id);
313 /* managed kzalloc/kfree for device drivers, no kmalloc, always use kzalloc */
314 extern void *devm_kzalloc(struct device *dev, size_t size, gfp_t gfp);
315 extern void devm_kfree(struct device *dev, void *p);
317 struct device_dma_parameters {
319 * a low level driver may set these to teach IOMMU code about
322 unsigned int max_segment_size;
323 unsigned long segment_boundary_mask;
327 struct klist klist_children;
328 struct klist_node knode_parent; /* node in sibling list */
329 struct klist_node knode_driver;
330 struct klist_node knode_bus;
331 struct device *parent;
334 char bus_id[BUS_ID_SIZE]; /* position on parent bus */
335 struct device_type *type;
336 unsigned uevent_suppress:1;
338 struct semaphore sem; /* semaphore to synchronize calls to
342 struct bus_type *bus; /* type of bus device is on */
343 struct device_driver *driver; /* which driver has allocated this
345 void *driver_data; /* data private to the driver */
346 void *platform_data; /* Platform specific data, device
347 core doesn't touch it */
348 struct dev_pm_info power;
351 int numa_node; /* NUMA node this device is close to */
353 u64 *dma_mask; /* dma mask (if dma'able device) */
354 u64 coherent_dma_mask;/* Like dma_mask, but for
355 alloc_coherent mappings as
356 not all hardware supports
357 64 bit addresses for consistent
358 allocations such descriptors. */
360 struct device_dma_parameters *dma_parms;
362 struct list_head dma_pools; /* dma pools (if dma'ble) */
364 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
366 /* arch specific additions */
367 struct dev_archdata archdata;
369 spinlock_t devres_lock;
370 struct list_head devres_head;
372 struct list_head node;
374 dev_t devt; /* dev_t, creates the sysfs "dev" */
375 struct attribute_group **groups; /* optional groups */
377 void (*release)(struct device *dev);
380 /* Get the wakeup routines, which depend on struct device */
381 #include <linux/pm_wakeup.h>
384 static inline int dev_to_node(struct device *dev)
386 return dev->numa_node;
388 static inline void set_dev_node(struct device *dev, int node)
390 dev->numa_node = node;
393 static inline int dev_to_node(struct device *dev)
397 static inline void set_dev_node(struct device *dev, int node)
402 static inline void *dev_get_drvdata(struct device *dev)
404 return dev->driver_data;
407 static inline void dev_set_drvdata(struct device *dev, void *data)
409 dev->driver_data = data;
412 static inline int device_is_registered(struct device *dev)
414 return dev->kobj.state_in_sysfs;
417 void driver_init(void);
420 * High level routines for use by the bus drivers
422 extern int __must_check device_register(struct device *dev);
423 extern void device_unregister(struct device *dev);
424 extern void device_initialize(struct device *dev);
425 extern int __must_check device_add(struct device *dev);
426 extern void device_del(struct device *dev);
427 extern int device_for_each_child(struct device *dev, void *data,
428 int (*fn)(struct device *dev, void *data));
429 extern struct device *device_find_child(struct device *dev, void *data,
430 int (*match)(struct device *dev, void *data));
431 extern int device_rename(struct device *dev, char *new_name);
432 extern int device_move(struct device *dev, struct device *new_parent);
435 * Manual binding of a device to driver. See drivers/base/bus.c
436 * for information on use.
438 extern int __must_check device_bind_driver(struct device *dev);
439 extern void device_release_driver(struct device *dev);
440 extern int __must_check device_attach(struct device *dev);
441 extern int __must_check driver_attach(struct device_driver *drv);
442 extern int __must_check device_reprobe(struct device *dev);
445 * Easy functions for dynamically creating devices on the fly
447 extern struct device *device_create(struct class *cls, struct device *parent,
448 dev_t devt, const char *fmt, ...)
449 __attribute__((format(printf, 4, 5)));
450 extern void device_destroy(struct class *cls, dev_t devt);
453 * Platform "fixup" functions - allow the platform to have their say
454 * about devices and actions that the general device layer doesn't
457 /* Notify platform of device discovery */
458 extern int (*platform_notify)(struct device *dev);
460 extern int (*platform_notify_remove)(struct device *dev);
464 * get_device - atomically increment the reference count for the device.
467 extern struct device *get_device(struct device *dev);
468 extern void put_device(struct device *dev);
471 /* drivers/base/power/shutdown.c */
472 extern void device_shutdown(void);
474 /* drivers/base/sys.c */
475 extern void sysdev_shutdown(void);
477 /* debugging and troubleshooting/diagnostic helpers. */
478 extern const char *dev_driver_string(struct device *dev);
479 #define dev_printk(level, dev, format, arg...) \
480 printk(level "%s %s: " format , dev_driver_string(dev) , \
481 (dev)->bus_id , ## arg)
483 #define dev_emerg(dev, format, arg...) \
484 dev_printk(KERN_EMERG , dev , format , ## arg)
485 #define dev_alert(dev, format, arg...) \
486 dev_printk(KERN_ALERT , dev , format , ## arg)
487 #define dev_crit(dev, format, arg...) \
488 dev_printk(KERN_CRIT , dev , format , ## arg)
489 #define dev_err(dev, format, arg...) \
490 dev_printk(KERN_ERR , dev , format , ## arg)
491 #define dev_warn(dev, format, arg...) \
492 dev_printk(KERN_WARNING , dev , format , ## arg)
493 #define dev_notice(dev, format, arg...) \
494 dev_printk(KERN_NOTICE , dev , format , ## arg)
495 #define dev_info(dev, format, arg...) \
496 dev_printk(KERN_INFO , dev , format , ## arg)
499 #define dev_dbg(dev, format, arg...) \
500 dev_printk(KERN_DEBUG , dev , format , ## arg)
502 #define dev_dbg(dev, format, arg...) \
503 ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
507 #define dev_vdbg dev_dbg
510 #define dev_vdbg(dev, format, arg...) \
511 ({ if (0) dev_printk(KERN_DEBUG, dev, format, ##arg); 0; })
514 /* Create alias, so I can be autoloaded. */
515 #define MODULE_ALIAS_CHARDEV(major,minor) \
516 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
517 #define MODULE_ALIAS_CHARDEV_MAJOR(major) \
518 MODULE_ALIAS("char-major-" __stringify(major) "-*")
519 #endif /* _DEVICE_H_ */