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vhci.h
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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 /* Number of supported ports. Value has an upperbound of USB_MAXCHILDREN */
75 #define VHCI_NPORTS 8
76 
77 /* for usb_bus.hcpriv */
78 struct vhci_hcd {
79  spinlock_t lock;
80 
81  u32 port_status[VHCI_NPORTS];
82 
83  unsigned resuming:1;
84  unsigned long re_timeout;
85 
86  atomic_t seqnum;
87 
88  /*
89  * NOTE:
90  * wIndex shows the port number and begins from 1.
91  * But, the index of this array begins from 0.
92  */
93  struct vhci_device vdev[VHCI_NPORTS];
94 };
95 
96 extern struct vhci_hcd *the_controller;
97 extern const struct attribute_group dev_attr_group;
98 #define hardware (&the_controller->pdev.dev)
99 
100 /* vhci_hcd.c */
101 void rh_port_connect(int rhport, enum usb_device_speed speed);
102 void rh_port_disconnect(int rhport);
103 
104 /* vhci_rx.c */
105 struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev, __u32 seqnum);
106 int vhci_rx_loop(void *data);
107 
108 /* vhci_tx.c */
109 int vhci_tx_loop(void *data);
110 
111 static inline struct vhci_device *port_to_vdev(__u32 port)
112 {
113  return &the_controller->vdev[port];
114 }
115 
116 static inline struct vhci_hcd *hcd_to_vhci(struct usb_hcd *hcd)
117 {
118  return (struct vhci_hcd *) (hcd->hcd_priv);
119 }
120 
121 static inline struct usb_hcd *vhci_to_hcd(struct vhci_hcd *vhci)
122 {
123  return container_of((void *) vhci, struct usb_hcd, hcd_priv);
124 }
125 
126 static inline struct device *vhci_dev(struct vhci_hcd *vhci)
127 {
128  return vhci_to_hcd(vhci)->self.controller;
129 }
130 
131 #endif /* __USBIP_VHCI_H */
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