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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 FTDEV_ENABLE_CMD 0
#define FTDEV_DISABLE_CMD 1
#define FTDEV_CALIBRATE 0x1410
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);
typedef long (*ftdev_calibrate_t)(struct ftdev* dev, unsigned int buf_no, unsigned long user_arg);
/* Let devices handle writes from userspace. No synchronization provided. */
typedef ssize_t (*ftdev_write_t)(struct ft_buffer* buf, size_t len, const char __user *from);
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* ftdev;
};
struct ftdev {
dev_t major;
struct cdev cdev;
struct class* class;
const char* name;
struct ftdev_minor* minor;
unsigned int minor_cnt;
ftdev_alloc_t alloc;
ftdev_free_t free;
ftdev_can_open_t can_open;
ftdev_write_t write;
ftdev_calibrate_t calibrate;
};
struct ft_buffer* alloc_ft_buffer(unsigned int count, size_t size);
void free_ft_buffer(struct ft_buffer* buf);
int ftdev_init( struct ftdev* ftdev, struct module* owner,
const int minor_cnt, const char* name);
void ftdev_exit(struct ftdev* ftdev);
int register_ftdev(struct ftdev* ftdev);
#endif
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