drivers/usb/mon/usb_mon.h

   1 /*
   2  * The USB Monitor, inspired by Dave Harding's USBMon.
   3  *
   4  * Copyright (C) 2005 Pete Zaitcev (zaitcev@redhat.com)
   5  */
   6
   7 #ifndef __USB_MON_H
   8 #define __USB_MON_H
   9
  10 #include <linux/list.h>
  11 #include <linux/slab.h>
  12 #include <linux/kref.h>
  13 /* #include <linux/usb.h> */    /* We use struct pointers only in this header */
  14
  15 #define TAG "usbmon"
  16
  17 struct mon_bus {
  18         struct list_head bus_link;
  19         spinlock_t lock;
  20         struct dentry *dent_s;          /* Debugging file */
  21         struct dentry *dent_t;          /* Text interface file */
  22         struct usb_bus *u_bus;
  23         int uses_dma;
  24
  25         /* Ref */
  26         int nreaders;                   /* Under mon_lock AND mbus->lock */
  27         struct list_head r_list;        /* Chain of readers (usually one) */
  28         struct kref ref;                /* Under mon_lock */
  29
  30         /* Stats */
  31         unsigned int cnt_events;
  32         unsigned int cnt_text_lost;
  33 };
  34
  35 /*
  36  * An instance of a process which opened a file (but can fork later)
  37  */
  38 struct mon_reader {
  39         struct list_head r_link;
  40         struct mon_bus *m_bus;
  41         void *r_data;           /* Use container_of instead? */
  42
  43         void (*rnf_submit)(void *data, struct urb *urb);
  44         void (*rnf_error)(void *data, struct urb *urb, int error);
  45         void (*rnf_complete)(void *data, struct urb *urb);
  46 };
  47
  48 void mon_reader_add(struct mon_bus *mbus, struct mon_reader *r);
  49 void mon_reader_del(struct mon_bus *mbus, struct mon_reader *r);
  50
  51 /*
  52  */
  53 extern char mon_dmapeek(unsigned char *dst, dma_addr_t dma_addr, int len);
  54
  55 extern struct mutex mon_lock;
  56
  57 extern const struct file_operations mon_fops_text;
  58 extern const struct file_operations mon_fops_stat;
  59
  60 #endif /* __USB_MON_H */