devtab.h

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#ifndef _FREERTOS_DRIVERS_COMMON_DEVTAB_H_
#define _FREERTOS_DRIVERS_COMMON_DEVTAB_H_
 
#include <sys/types.h>
 
typedef struct file file_t;
typedef struct node node_t;
 
typedef struct devops
{
    int (*open)(file_t *, const char *, int, int);
    int (*close)(file_t *, node_t*);
    ssize_t (*read)(file_t *, void *, size_t);
    ssize_t (*write)(file_t *, const void *, size_t);
    int (*ioctl)(file_t *, node_t *, int, void *);
} devops_t;
 
typedef struct devtab
{
    const char *name; 
    int (*init)(struct devtab *); 
    devops_t *devops; 
    void *priv; 
} devtab_t;
 
typedef struct node
{
    void *priv; 
    unsigned int references; 
} node_t;
 
typedef struct file
{
    devtab_t *dev; 
    node_t *node; 
    off_t offset; 
    int flags; 
    char inuse; 
} file_t;
 
extern devtab_t DEVTAB[];
extern devtab_t DEVTAB_END;
 
#define __string(_x) #_x
#define __xstring(_x) __string(_x)
 
#define DEVOPS(_label, _open, _close, _read, _write, _ioctl) \
    devops_t _label =                                        \
    {                                                        \
        _open,                                               \
        _close,                                              \
        _read,                                               \
        _write,                                              \
        _ioctl                                               \
    };
 
#define TABLE_ENTRY(_name) \
    __attribute__((section((".device.table." __xstring(_name) ".data")))) \
    __attribute__((used))
 
#define DEVTAB_ENTRY(_label, _name, _init, _devops, _priv) \
    devtab_t _label TABLE_ENTRY(devtab) =           \
    {                                               \
        _name,                                      \
        _init,                                      \
        _devops,                                    \
        _priv                                       \
    };
 
#endif /* _FREERTOS_DRIVERS_COMMON_DEVTAB_H_ */