drivers/staging/usbip/vhci.h

   1 /*
   2  * Copyright (C) 2003-2008 Takahiro Hirofuchi
   3  *
   4  * This is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  */
  10
  11 #ifndef __USBIP_VHCI_H
  12 #define __USBIP_VHCI_H
  13
  14 #include <linux/device.h>
  15 #include <linux/list.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/sysfs.h>
  18 #include <linux/types.h>
  19 #include <linux/usb.h>
  20 #include <linux/usb/hcd.h>
  21 #include <linux/wait.h>
  22
  23 struct vhci_device {
  24         struct usb_device *udev;
  25
  26         /*
  27          * devid specifies a remote usb device uniquely instead
  28          * of combination of busnum and devnum.
  29          */
  30         __u32 devid;
  31
  32         /* speed of a remote device */
  33         enum usb_device_speed speed;
  34
  35         /* vhci root-hub port to which this device is attached */
  36         __u32 rhport;
  37
  38         struct usbip_device ud;
  39
  40         /* lock for the below link lists */
  41         spinlock_t priv_lock;
  42
  43         /* vhci_priv is linked to one of them. */
  44         struct list_head priv_tx;
  45         struct list_head priv_rx;
  46
  47         /* vhci_unlink is linked to one of them */
  48         struct list_head unlink_tx;
  49         struct list_head unlink_rx;
  50
  51         /* vhci_tx thread sleeps for this queue */
  52         wait_queue_head_t waitq_tx;
  53 };
  54
  55 /* urb->hcpriv, use container_of() */
  56 struct vhci_priv {
  57         unsigned long seqnum;
  58         struct list_head list;
  59
  60         struct vhci_device *vdev;
  61         struct urb *urb;
  62 };
  63
  64 struct vhci_unlink {
  65         /* seqnum of this request */
  66         unsigned long seqnum;
  67
  68         struct list_head list;
  69
  70         /* seqnum of the unlink target */
  71         unsigned long unlink_seqnum;
  72 };
  73
  74 /*
  75  * The number of ports is less than 16 ?
  76  * USB_MAXCHILDREN is statically defined to 16 in usb.h.  Its maximum value
  77  * would be 31 because the event_bits[1] of struct usb_hub is defined as
  78  * unsigned long in hub.h
  79  */
  80 #define VHCI_NPORTS 8
  81
  82 /* for usb_bus.hcpriv */
  83 struct vhci_hcd {
  84         spinlock_t lock;
  85
  86         u32 port_status[VHCI_NPORTS];
  87
  88         unsigned resuming:1;
  89         unsigned long re_timeout;
  90
  91         atomic_t seqnum;
  92
  93         /*
  94          * NOTE:
  95          * wIndex shows the port number and begins from 1.
  96          * But, the index of this array begins from 0.
  97          */
  98         struct vhci_device vdev[VHCI_NPORTS];
  99 };
 100
 101 extern struct vhci_hcd *the_controller;
 102 extern const struct attribute_group dev_attr_group;
 103 #define hardware (&the_controller->pdev.dev)
 104
 105 /* vhci_hcd.c */
 106 void rh_port_connect(int rhport, enum usb_device_speed speed);
 107 void rh_port_disconnect(int rhport);
 108
 109 /* vhci_rx.c */
 110 struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev, __u32 seqnum);
 111 int vhci_rx_loop(void *data);
 112
 113 /* vhci_tx.c */
 114 int vhci_tx_loop(void *data);
 115
 116 static inline struct vhci_device *port_to_vdev(__u32 port)
 117 {
 118         return &the_controller->vdev[port];
 119 }
 120
 121 static inline struct vhci_hcd *hcd_to_vhci(struct usb_hcd *hcd)
 122 {
 123         return (struct vhci_hcd *) (hcd->hcd_priv);
 124 }
 125
 126 static inline struct usb_hcd *vhci_to_hcd(struct vhci_hcd *vhci)
 127 {
 128         return container_of((void *) vhci, struct usb_hcd, hcd_priv);
 129 }
 130
 131 static inline struct device *vhci_dev(struct vhci_hcd *vhci)
 132 {
 133         return vhci_to_hcd(vhci)->self.controller;
 134 }
 135
 136 #endif /* __USBIP_VHCI_H */