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#ifndef _LITMUS_FTDEV_H_
#define _LITMUS_FTDEV_H_
#include <litmus/feather_trace.h>
#include <litmus/feather_buffer.h>
#include <linux/mutex.h>
#include <linux/cdev.h>
#define MAX_FTDEV_MINORS NR_CPUS
#define FTDEV_ENABLE_CMD 0
#define FTDEV_DISABLE_CMD 1
struct ftdev;
/* return 0 if buffer can be opened, otherwise -$REASON */
typedef int (*ftdev_can_open_t)(struct ftdev* dev, unsigned int buf_no);
/* return 0 on success, otherwise -$REASON */
typedef int (*ftdev_alloc_t)(struct ftdev* dev, unsigned int buf_no);
typedef void (*ftdev_free_t)(struct ftdev* dev, unsigned int buf_no);
struct ftdev_event;
struct ftdev_minor {
struct ft_buffer* buf;
unsigned int readers;
struct mutex lock;
/* FIXME: filter for authorized events */
struct ftdev_event* events;
struct device* device;
};
struct ftdev {
struct cdev cdev;
struct class* class;
const char* name;
/* FIXME: don't waste memory, allocate dynamically */
struct ftdev_minor minor[MAX_FTDEV_MINORS];
unsigned int minor_cnt;
ftdev_alloc_t alloc;
ftdev_free_t free;
ftdev_can_open_t can_open;
};
struct ft_buffer* alloc_ft_buffer(unsigned int count, size_t size);
void free_ft_buffer(struct ft_buffer* buf);
void ftdev_init(struct ftdev* ftdev, struct module* owner, const char* name);
int register_ftdev(struct ftdev* ftdev);
#endif
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