usb_mon.h

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/*
 * The USB Monitor, inspired by Dave Harding's USBMon.
 *
 * Copyright (C) 2005 Pete Zaitcev ([email protected])
 */

#ifndef __USB_MON_H
#define __USB_MON_H

#include <linux/list.h>
#include <linux/slab.h>
#include <linux/kref.h>
/* #include <linux/usb.h> */    /* We use struct pointers only in this header */

#define TAG "usbmon"

struct mon_bus {
    struct list_head bus_link;
    spinlock_t lock;
    struct usb_bus *u_bus;

    int text_inited;
    int bin_inited;
    struct dentry *dent_s;      /* Debugging file */
    struct dentry *dent_t;      /* Text interface file */
    struct dentry *dent_u;      /* Second text interface file */
    struct device *classdev;    /* Device in usbmon class */

    /* Ref */
    int nreaders;           /* Under mon_lock AND mbus->lock */
    struct list_head r_list;    /* Chain of readers (usually one) */
    struct kref ref;        /* Under mon_lock */

    /* Stats */
    unsigned int cnt_events;
    unsigned int cnt_text_lost;
};

/*
 * An instance of a process which opened a file (but can fork later)
 */
struct mon_reader {
    struct list_head r_link;
    struct mon_bus *m_bus;
    void *r_data;       /* Use container_of instead? */

    void (*rnf_submit)(void *data, struct urb *urb);
    void (*rnf_error)(void *data, struct urb *urb, int error);
    void (*rnf_complete)(void *data, struct urb *urb, int status);
};

void mon_reader_add(struct mon_bus *mbus, struct mon_reader *r);
void mon_reader_del(struct mon_bus *mbus, struct mon_reader *r);

struct mon_bus *mon_bus_lookup(unsigned int num);

int /*bool*/ mon_text_add(struct mon_bus *mbus, const struct usb_bus *ubus);
void mon_text_del(struct mon_bus *mbus);
int /*bool*/ mon_bin_add(struct mon_bus *mbus, const struct usb_bus *ubus);
void mon_bin_del(struct mon_bus *mbus);

int __init mon_text_init(void);
void mon_text_exit(void);
int __init mon_bin_init(void);
void mon_bin_exit(void);

/*
 */
extern struct mutex mon_lock;

extern const struct file_operations mon_fops_stat;

extern struct mon_bus mon_bus0;     /* Only for redundant checks */

#endif /* __USB_MON_H */