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* device.h - generic, centralized driver model
*
* Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
*
* This file is released under the GPLv2
*
* See Documentation/driver-model/ for more information.
*/
#ifndef _DEVICE_H_
#define _DEVICE_H_
#include <linux/config.h>
#include <linux/ioport.h>
#include <linux/kobject.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/pm.h>
#include <asm/semaphore.h>
#include <asm/atomic.h>
#define DEVICE_NAME_SIZE 50
#define DEVICE_NAME_HALF __stringify(20) /* Less than half to accommodate slop */
#define DEVICE_ID_SIZE 32
#define BUS_ID_SIZE KOBJ_NAME_LEN
enum {
SUSPEND_NOTIFY,
SUSPEND_SAVE_STATE,
SUSPEND_DISABLE,
SUSPEND_POWER_DOWN,
};
enum {
RESUME_POWER_ON,
RESUME_RESTORE_STATE,
RESUME_ENABLE,
};
struct device;
struct device_driver;
struct class;
struct class_device;
struct bus_type {
char * name;
struct subsystem subsys;
struct kset drivers;
struct kset devices;
int (*match)(struct device * dev, struct device_driver * drv);
struct device * (*add) (struct device * parent, char * bus_id);
int (*hotplug) (struct device *dev, char **envp,
int num_envp, char *buffer, int buffer_size);
int (*suspend)(struct device * dev, u32 state);
int (*resume)(struct device * dev);
};
extern int bus_register(struct bus_type * bus);
extern void bus_unregister(struct bus_type * bus);
extern int bus_rescan_devices(struct bus_type * bus);
extern struct bus_type * get_bus(struct bus_type * bus);
extern void put_bus(struct bus_type * bus);
extern struct bus_type * find_bus(char * name);
/* iterator helpers for buses */
int bus_for_each_dev(struct bus_type * bus, struct device * start, void * data,
int (*fn)(struct device *, void *));
int bus_for_each_drv(struct bus_type * bus, struct device_driver * start,
void * data, int (*fn)(struct device_driver *, void *));
/* driverfs interface for exporting bus attributes */
struct bus_attribute {
struct attribute attr;
ssize_t (*show)(struct bus_type *, char * buf);
ssize_t (*store)(struct bus_type *, const char * buf, size_t count);
};
#define BUS_ATTR(_name,_mode,_show,_store) \
struct bus_attribute bus_attr_##_name = { \
.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE }, \
.show = _show, \
.store = _store, \
};
extern int bus_create_file(struct bus_type *, struct bus_attribute *);
extern void bus_remove_file(struct bus_type *, struct bus_attribute *);
struct device_driver {
char * name;
struct bus_type * bus;
struct semaphore unload_sem;
struct kobject kobj;
struct list_head devices;
int (*probe) (struct device * dev);
int (*remove) (struct device * dev);
void (*shutdown) (struct device * dev);
int (*suspend) (struct device * dev, u32 state, u32 level);
int (*resume) (struct device * dev, u32 level);
};
extern int driver_register(struct device_driver * drv);
extern void driver_unregister(struct device_driver * drv);
extern struct device_driver * get_driver(struct device_driver * drv);
extern void put_driver(struct device_driver * drv);
/* driverfs interface for exporting driver attributes */
struct driver_attribute {
struct attribute attr;
ssize_t (*show)(struct device_driver *, char * buf);
ssize_t (*store)(struct device_driver *, const char * buf, size_t count);
};
#define DRIVER_ATTR(_name,_mode,_show,_store) \
struct driver_attribute driver_attr_##_name = { \
.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE }, \
.show = _show, \
.store = _store, \
};
extern int driver_create_file(struct device_driver *, struct driver_attribute *);
extern void driver_remove_file(struct device_driver *, struct driver_attribute *);
/*
* device classes
*/
struct class {
char * name;
struct subsystem subsys;
struct list_head children;
struct list_head interfaces;
int (*hotplug)(struct class_device *dev, char **envp,
int num_envp, char *buffer, int buffer_size);
void (*release)(struct class_device *dev);
};
extern int class_register(struct class *);
extern void class_unregister(struct class *);
extern struct class * class_get(struct class *);
extern void class_put(struct class *);
struct class_attribute {
struct attribute attr;
ssize_t (*show)(struct class *, char * buf);
ssize_t (*store)(struct class *, const char * buf, size_t count);
};
#define CLASS_ATTR(_name,_mode,_show,_store) \
struct class_attribute class_attr_##_name = { \
.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE }, \
.show = _show, \
.store = _store, \
};
extern int class_create_file(struct class *, const struct class_attribute *);
extern void class_remove_file(struct class *, const struct class_attribute *);
struct class_device {
struct list_head node;
struct kobject kobj;
struct class * class; /* required */
struct device * dev; /* not necessary, but nice to have */
void * class_data; /* class-specific data */
char class_id[BUS_ID_SIZE]; /* unique to this class */
};
static inline void *
class_get_devdata (struct class_device *dev)
{
return dev->class_data;
}
static inline void
class_set_devdata (struct class_device *dev, void *data)
{
dev->class_data = data;
}
extern int class_device_register(struct class_device *);
extern void class_device_unregister(struct class_device *);
extern void class_device_initialize(struct class_device *);
extern int class_device_add(struct class_device *);
extern void class_device_del(struct class_device *);
extern int class_device_rename(struct class_device *, char *);
extern struct class_device * class_device_get(struct class_device *);
extern void class_device_put(struct class_device *);
struct class_device_attribute {
struct attribute attr;
ssize_t (*show)(struct class_device *, char * buf);
ssize_t (*store)(struct class_device *, const char * buf, size_t count);
};
#define CLASS_DEVICE_ATTR(_name,_mode,_show,_store) \
struct class_device_attribute class_device_attr_##_name = { \
.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE }, \
.show = _show, \
.store = _store, \
};
extern int class_device_create_file(struct class_device *,
const struct class_device_attribute *);
extern void class_device_remove_file(struct class_device *,
const struct class_device_attribute *);
struct class_interface {
struct list_head node;
struct class *class;
int (*add) (struct class_device *);
void (*remove) (struct class_device *);
};
extern int class_interface_register(struct class_interface *);
extern void class_interface_unregister(struct class_interface *);
struct device {
struct list_head node; /* node in sibling list */
struct list_head bus_list; /* node in bus's list */
struct list_head driver_list;
struct list_head children;
struct device * parent;
struct completion * complete; /* Notification for freeing device. */
struct kobject kobj;
char bus_id[BUS_ID_SIZE]; /* position on parent bus */
struct bus_type * bus; /* type of bus device is on */
struct device_driver *driver; /* which driver has allocated this
device */
void *driver_data; /* data private to the driver */
void *platform_data; /* Platform specific data (e.g. ACPI,
BIOS data relevant to device) */
struct dev_pm_info power;
u32 power_state; /* Current operating state. In
ACPI-speak, this is D0-D3, D0
being fully functional, and D3
being off. */
unsigned char *saved_state; /* saved device state */
u32 detach_state; /* State to enter when device is
detached from its driver. */
u64 *dma_mask; /* dma mask (if dma'able device) */
void (*release)(struct device * dev);
};
static inline struct device *
list_to_dev(struct list_head *node)
{
return list_entry(node, struct device, node);
}
static inline void *
dev_get_drvdata (struct device *dev)
{
return dev->driver_data;
}
static inline void
dev_set_drvdata (struct device *dev, void *data)
{
dev->driver_data = data;
}
/*
* High level routines for use by the bus drivers
*/
extern int device_register(struct device * dev);
extern void device_unregister(struct device * dev);
extern void device_unregister_wait(struct device * dev);
extern void device_initialize(struct device * dev);
extern int device_add(struct device * dev);
extern void device_del(struct device * dev);
extern int device_for_each_child(struct device *, void *,
int (*fn)(struct device *, void *));
/*
* Manual binding of a device to driver. See drivers/base/bus.c
* for information on use.
*/
extern void device_bind_driver(struct device * dev);
extern void device_release_driver(struct device * dev);
extern void driver_attach(struct device_driver * drv);
/* driverfs interface for exporting device attributes */
struct device_attribute {
struct attribute attr;
ssize_t (*show)(struct device * dev, char * buf);
ssize_t (*store)(struct device * dev, const char * buf, size_t count);
};
#define DEVICE_ATTR(_name,_mode,_show,_store) \
struct device_attribute dev_attr_##_name = { \
.attr = {.name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE }, \
.show = _show, \
.store = _store, \
};
extern int device_create_file(struct device *device, struct device_attribute * entry);
extern void device_remove_file(struct device * dev, struct device_attribute * attr);
/*
* Platform "fixup" functions - allow the platform to have their say
* about devices and actions that the general device layer doesn't
* know about.
*/
/* Notify platform of device discovery */
extern int (*platform_notify)(struct device * dev);
extern int (*platform_notify_remove)(struct device * dev);
/**
* get_device - atomically increment the reference count for the device.
*
*/
extern struct device * get_device(struct device * dev);
extern void put_device(struct device * dev);
/* drivers/base/platform.c */
struct platform_device {
char * name;
u32 id;
struct device dev;
u32 num_resources;
struct resource * resource;
};
#define to_platform_device(x) container_of((x), struct platform_device, dev)
extern int platform_device_register(struct platform_device *);
extern void platform_device_unregister(struct platform_device *);
extern struct bus_type platform_bus_type;
extern struct device platform_bus;
/* drivers/base/power.c */
extern void device_shutdown(void);
/* drivers/base/firmware.c */
extern int firmware_register(struct subsystem *);
extern void firmware_unregister(struct subsystem *);
/* debugging and troubleshooting/diagnostic helpers. */
#define dev_printk(level, dev, format, arg...) \
printk(level "%s %s: " format , (dev)->driver->name , (dev)->bus_id , ## arg)
#ifdef DEBUG
#define dev_dbg(dev, format, arg...) \
dev_printk(KERN_DEBUG , dev , format , ## arg)
#else
#define dev_dbg(dev, format, arg...) do {} while (0)
#endif
#define dev_err(dev, format, arg...) \
dev_printk(KERN_ERR , dev , format , ## arg)
#define dev_info(dev, format, arg...) \
dev_printk(KERN_INFO , dev , format , ## arg)
#define dev_warn(dev, format, arg...) \
dev_printk(KERN_WARNING , dev , format , ## arg)
/* Create alias, so I can be autoloaded. */
#define MODULE_ALIAS_CHARDEV(major,minor) \
MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
#define MODULE_ALIAS_CHARDEV_MAJOR(major) \
MODULE_ALIAS("char-major-" __stringify(major) "-*")
#endif /* _DEVICE_H_ */
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