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