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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * device.h - generic, centralized driver model
3 *
4 * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
5 *
6 * This file is released under the GPLv2
7 *
8 * See Documentation/driver-model/ for more information.
9 */
10
11#ifndef _DEVICE_H_
12#define _DEVICE_H_
13
14#include <linux/config.h>
15#include <linux/ioport.h>
16#include <linux/kobject.h>
mochel@digitalimplant.org465c7a32005-03-21 11:49:14 -080017#include <linux/klist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/list.h>
19#include <linux/types.h>
20#include <linux/module.h>
21#include <linux/pm.h>
22#include <asm/semaphore.h>
23#include <asm/atomic.h>
24
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
29
30
Linus Torvalds1da177e2005-04-16 15:20:36 -070031struct device;
32struct device_driver;
33struct class;
34struct class_device;
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36struct bus_type {
Dmitry Torokhov8d790d72005-04-26 02:34:05 -050037 const char * name;
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39 struct subsystem subsys;
40 struct kset drivers;
41 struct kset devices;
mochel@digitalimplant.org465c7a32005-03-21 11:49:14 -080042 struct klist klist_devices;
mochel@digitalimplant.org38fdac32005-03-21 12:00:18 -080043 struct klist klist_drivers;
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
45 struct bus_attribute * bus_attrs;
46 struct device_attribute * dev_attrs;
47 struct driver_attribute * drv_attrs;
48
49 int (*match)(struct device * dev, struct device_driver * drv);
Kay Sievers312c0042005-11-16 09:00:00 +010050 int (*uevent)(struct device *dev, char **envp,
51 int num_envp, char *buffer, int buffer_size);
Russell King594c8282006-01-05 14:29:51 +000052 int (*probe)(struct device * dev);
53 int (*remove)(struct device * dev);
54 void (*shutdown)(struct device * dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 int (*suspend)(struct device * dev, pm_message_t state);
56 int (*resume)(struct device * dev);
57};
58
59extern int bus_register(struct bus_type * bus);
60extern void bus_unregister(struct bus_type * bus);
61
Greg Kroah-Hartman23d3d602005-06-22 16:09:05 -070062extern void bus_rescan_devices(struct bus_type * bus);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64extern struct bus_type * get_bus(struct bus_type * bus);
65extern void put_bus(struct bus_type * bus);
66
67extern struct bus_type * find_bus(char * name);
68
69/* iterator helpers for buses */
70
71int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data,
72 int (*fn)(struct device *, void *));
Cornelia Huck0edb5862005-06-22 16:59:51 +020073struct device * bus_find_device(struct bus_type *bus, struct device *start,
74 void *data, int (*match)(struct device *, void *));
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76int bus_for_each_drv(struct bus_type * bus, struct device_driver * start,
77 void * data, int (*fn)(struct device_driver *, void *));
78
79
80/* driverfs interface for exporting bus attributes */
81
82struct bus_attribute {
83 struct attribute attr;
84 ssize_t (*show)(struct bus_type *, char * buf);
85 ssize_t (*store)(struct bus_type *, const char * buf, size_t count);
86};
87
88#define BUS_ATTR(_name,_mode,_show,_store) \
89struct bus_attribute bus_attr_##_name = __ATTR(_name,_mode,_show,_store)
90
91extern int bus_create_file(struct bus_type *, struct bus_attribute *);
92extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
93
94struct device_driver {
Dmitry Torokhov8d790d72005-04-26 02:34:05 -050095 const char * name;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 struct bus_type * bus;
97
98 struct completion unloaded;
99 struct kobject kobj;
mochel@digitalimplant.org94e7b1c2005-03-21 12:25:36 -0800100 struct klist klist_devices;
mochel@digitalimplant.org38fdac32005-03-21 12:00:18 -0800101 struct klist_node knode_bus;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
Dmitry Torokhov8d790d72005-04-26 02:34:05 -0500103 struct module * owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
105 int (*probe) (struct device * dev);
Dmitry Torokhov8d790d72005-04-26 02:34:05 -0500106 int (*remove) (struct device * dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 void (*shutdown) (struct device * dev);
Russell King9480e302005-10-28 09:52:56 -0700108 int (*suspend) (struct device * dev, pm_message_t state);
109 int (*resume) (struct device * dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110};
111
112
113extern int driver_register(struct device_driver * drv);
114extern void driver_unregister(struct device_driver * drv);
115
116extern struct device_driver * get_driver(struct device_driver * drv);
117extern void put_driver(struct device_driver * drv);
118extern struct device_driver *driver_find(const char *name, struct bus_type *bus);
119
120
121/* driverfs interface for exporting driver attributes */
122
123struct driver_attribute {
124 struct attribute attr;
125 ssize_t (*show)(struct device_driver *, char * buf);
126 ssize_t (*store)(struct device_driver *, const char * buf, size_t count);
127};
128
129#define DRIVER_ATTR(_name,_mode,_show,_store) \
130struct driver_attribute driver_attr_##_name = __ATTR(_name,_mode,_show,_store)
131
132extern int driver_create_file(struct device_driver *, struct driver_attribute *);
133extern void driver_remove_file(struct device_driver *, struct driver_attribute *);
134
mochel@digitalimplant.orgfae3cd02005-03-21 10:59:56 -0800135extern int driver_for_each_device(struct device_driver * drv, struct device * start,
136 void * data, int (*fn)(struct device *, void *));
Cornelia Huck0edb5862005-06-22 16:59:51 +0200137struct device * driver_find_device(struct device_driver *drv,
138 struct device *start, void *data,
139 int (*match)(struct device *, void *));
mochel@digitalimplant.orgfae3cd02005-03-21 10:59:56 -0800140
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
142/*
143 * device classes
144 */
145struct class {
Dmitry Torokhov8d790d72005-04-26 02:34:05 -0500146 const char * name;
gregkh@suse.dee9ba6362005-03-15 11:54:21 -0800147 struct module * owner;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
149 struct subsystem subsys;
150 struct list_head children;
151 struct list_head interfaces;
152 struct semaphore sem; /* locks both the children and interfaces lists */
153
154 struct class_attribute * class_attrs;
155 struct class_device_attribute * class_dev_attrs;
156
Kay Sievers312c0042005-11-16 09:00:00 +0100157 int (*uevent)(struct class_device *dev, char **envp,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 int num_envp, char *buffer, int buffer_size);
159
160 void (*release)(struct class_device *dev);
161 void (*class_release)(struct class *class);
162};
163
164extern int class_register(struct class *);
165extern void class_unregister(struct class *);
166
167extern struct class * class_get(struct class *);
168extern void class_put(struct class *);
169
170
171struct class_attribute {
172 struct attribute attr;
173 ssize_t (*show)(struct class *, char * buf);
174 ssize_t (*store)(struct class *, const char * buf, size_t count);
175};
176
177#define CLASS_ATTR(_name,_mode,_show,_store) \
178struct class_attribute class_attr_##_name = __ATTR(_name,_mode,_show,_store)
179
180extern int class_create_file(struct class *, const struct class_attribute *);
181extern void class_remove_file(struct class *, const struct class_attribute *);
182
Kay Sieversa7fd6702005-10-01 14:49:43 +0200183struct class_device_attribute {
184 struct attribute attr;
185 ssize_t (*show)(struct class_device *, char * buf);
186 ssize_t (*store)(struct class_device *, const char * buf, size_t count);
187};
188
189#define CLASS_DEVICE_ATTR(_name,_mode,_show,_store) \
190struct class_device_attribute class_device_attr_##_name = \
191 __ATTR(_name,_mode,_show,_store)
192
193extern int class_device_create_file(struct class_device *,
194 const struct class_device_attribute *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195
Greg Kroah-Hartman74be2272005-10-27 22:25:43 -0700196/**
197 * struct class_device - class devices
198 * @class: pointer to the parent class for this class device. This is required.
199 * @devt: for internal use by the driver core only.
200 * @node: for internal use by the driver core only.
201 * @kobj: for internal use by the driver core only.
202 * @devt_attr: for internal use by the driver core only.
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
207 * set this pointer.
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.
Kay Sievers312c0042005-11-16 09:00:00 +0100215 * @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
Greg Kroah-Hartman74be2272005-10-27 22:25:43 -0700218 * when you are nesting class_device structures.
219 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220struct class_device {
221 struct list_head node;
222
223 struct kobject kobj;
224 struct class * class; /* required */
225 dev_t devt; /* dev_t, creates the sysfs "dev" */
gregkh@suse.dee9ba6362005-03-15 11:54:21 -0800226 struct class_device_attribute *devt_attr;
Kay Sieversa7fd6702005-10-01 14:49:43 +0200227 struct class_device_attribute uevent_attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 struct device * dev; /* not necessary, but nice to have */
229 void * class_data; /* class-specific data */
Greg Kroah-Hartman51d172d2005-10-27 22:25:43 -0700230 struct class_device *parent; /* parent of this child device, if there is one */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
Greg Kroah-Hartman51d172d2005-10-27 22:25:43 -0700232 void (*release)(struct class_device *dev);
Kay Sievers312c0042005-11-16 09:00:00 +0100233 int (*uevent)(struct class_device *dev, char **envp,
Greg Kroah-Hartman51d172d2005-10-27 22:25:43 -0700234 int num_envp, char *buffer, int buffer_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 char class_id[BUS_ID_SIZE]; /* unique to this class */
236};
237
238static inline void *
239class_get_devdata (struct class_device *dev)
240{
241 return dev->class_data;
242}
243
244static inline void
245class_set_devdata (struct class_device *dev, void *data)
246{
247 dev->class_data = data;
248}
249
250
251extern int class_device_register(struct class_device *);
252extern void class_device_unregister(struct class_device *);
253extern void class_device_initialize(struct class_device *);
254extern int class_device_add(struct class_device *);
255extern void class_device_del(struct class_device *);
256
257extern int class_device_rename(struct class_device *, char *);
258
259extern struct class_device * class_device_get(struct class_device *);
260extern void class_device_put(struct class_device *);
261
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262extern void class_device_remove_file(struct class_device *,
263 const struct class_device_attribute *);
264extern int class_device_create_bin_file(struct class_device *,
265 struct bin_attribute *);
266extern void class_device_remove_bin_file(struct class_device *,
267 struct bin_attribute *);
268
269struct class_interface {
270 struct list_head node;
271 struct class *class;
272
Dmitry Torokhovd8539d82005-09-15 02:01:36 -0500273 int (*add) (struct class_device *, struct class_interface *);
274 void (*remove) (struct class_device *, struct class_interface *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275};
276
277extern int class_interface_register(struct class_interface *);
278extern void class_interface_unregister(struct class_interface *);
279
gregkh@suse.dee9ba6362005-03-15 11:54:21 -0800280extern struct class *class_create(struct module *owner, char *name);
281extern void class_destroy(struct class *cls);
Greg Kroah-Hartman51d172d2005-10-27 22:25:43 -0700282extern struct class_device *class_device_create(struct class *cls,
283 struct class_device *parent,
284 dev_t devt,
285 struct device *device,
286 char *fmt, ...)
287 __attribute__((format(printf,5,6)));
gregkh@suse.dee9ba6362005-03-15 11:54:21 -0800288extern void class_device_destroy(struct class *cls, dev_t devt);
289
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
Kay Sieversa7fd6702005-10-01 14:49:43 +0200291/* interface for exporting device attributes */
292struct device_attribute {
293 struct attribute attr;
294 ssize_t (*show)(struct device *dev, struct device_attribute *attr,
295 char *buf);
296 ssize_t (*store)(struct device *dev, struct device_attribute *attr,
297 const char *buf, size_t count);
298};
299
300#define DEVICE_ATTR(_name,_mode,_show,_store) \
301struct device_attribute dev_attr_##_name = __ATTR(_name,_mode,_show,_store)
302
303extern int device_create_file(struct device *device, struct device_attribute * entry);
304extern void device_remove_file(struct device * dev, struct device_attribute * attr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305struct device {
mochel@digitalimplant.org36239572005-03-24 19:08:30 -0800306 struct klist klist_children;
307 struct klist_node knode_parent; /* node in sibling list */
mochel@digitalimplant.org94e7b1c2005-03-21 12:25:36 -0800308 struct klist_node knode_driver;
mochel@digitalimplant.org465c7a32005-03-21 11:49:14 -0800309 struct klist_node knode_bus;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 struct device * parent;
311
312 struct kobject kobj;
313 char bus_id[BUS_ID_SIZE]; /* position on parent bus */
Kay Sieversa7fd6702005-10-01 14:49:43 +0200314 struct device_attribute uevent_attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
mochel@digitalimplant.orgaf703162005-03-21 10:41:04 -0800316 struct semaphore sem; /* semaphore to synchronize calls to
317 * its driver.
318 */
319
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 struct bus_type * bus; /* type of bus device is on */
321 struct device_driver *driver; /* which driver has allocated this
322 device */
323 void *driver_data; /* data private to the driver */
David Shaohua Li4e10d122005-03-18 18:45:35 -0500324 void *platform_data; /* Platform specific data, device
325 core doesn't touch it */
326 void *firmware_data; /* Firmware specific data (e.g. ACPI,
327 BIOS data),reserved for device core*/
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 struct dev_pm_info power;
329
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 u64 *dma_mask; /* dma mask (if dma'able device) */
331 u64 coherent_dma_mask;/* Like dma_mask, but for
332 alloc_coherent mappings as
333 not all hardware supports
334 64 bit addresses for consistent
335 allocations such descriptors. */
336
337 struct list_head dma_pools; /* dma pools (if dma'ble) */
338
339 struct dma_coherent_mem *dma_mem; /* internal for coherent mem
340 override */
341
342 void (*release)(struct device * dev);
343};
344
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345static inline void *
346dev_get_drvdata (struct device *dev)
347{
348 return dev->driver_data;
349}
350
351static inline void
352dev_set_drvdata (struct device *dev, void *data)
353{
354 dev->driver_data = data;
355}
356
Daniel Ritzd305ef52005-09-22 00:47:24 -0700357static inline int device_is_registered(struct device *dev)
358{
359 return klist_node_attached(&dev->knode_bus);
360}
361
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362/*
363 * High level routines for use by the bus drivers
364 */
365extern int device_register(struct device * dev);
366extern void device_unregister(struct device * dev);
367extern void device_initialize(struct device * dev);
368extern int device_add(struct device * dev);
369extern void device_del(struct device * dev);
370extern int device_for_each_child(struct device *, void *,
371 int (*fn)(struct device *, void *));
372
373/*
374 * Manual binding of a device to driver. See drivers/base/bus.c
375 * for information on use.
376 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377extern void device_bind_driver(struct device * dev);
378extern void device_release_driver(struct device * dev);
379extern int device_attach(struct device * dev);
380extern void driver_attach(struct device_driver * drv);
Moore, Erice935d5d2006-03-14 09:18:18 -0700381extern void device_reprobe(struct device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
383
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384/*
385 * Platform "fixup" functions - allow the platform to have their say
386 * about devices and actions that the general device layer doesn't
387 * know about.
388 */
389/* Notify platform of device discovery */
390extern int (*platform_notify)(struct device * dev);
391
392extern int (*platform_notify_remove)(struct device * dev);
393
394
395/**
396 * get_device - atomically increment the reference count for the device.
397 *
398 */
399extern struct device * get_device(struct device * dev);
400extern void put_device(struct device * dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
402
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403/* drivers/base/power.c */
404extern void device_shutdown(void);
405
406
407/* drivers/base/firmware.c */
408extern int firmware_register(struct subsystem *);
409extern void firmware_unregister(struct subsystem *);
410
411/* debugging and troubleshooting/diagnostic helpers. */
412#define dev_printk(level, dev, format, arg...) \
413 printk(level "%s %s: " format , (dev)->driver ? (dev)->driver->name : "" , (dev)->bus_id , ## arg)
414
415#ifdef DEBUG
416#define dev_dbg(dev, format, arg...) \
417 dev_printk(KERN_DEBUG , dev , format , ## arg)
418#else
419#define dev_dbg(dev, format, arg...) do { (void)(dev); } while (0)
420#endif
421
422#define dev_err(dev, format, arg...) \
423 dev_printk(KERN_ERR , dev , format , ## arg)
424#define dev_info(dev, format, arg...) \
425 dev_printk(KERN_INFO , dev , format , ## arg)
426#define dev_warn(dev, format, arg...) \
427 dev_printk(KERN_WARNING , dev , format , ## arg)
428
429/* Create alias, so I can be autoloaded. */
430#define MODULE_ALIAS_CHARDEV(major,minor) \
431 MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
432#define MODULE_ALIAS_CHARDEV_MAJOR(major) \
433 MODULE_ALIAS("char-major-" __stringify(major) "-*")
434#endif /* _DEVICE_H_ */