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  * This is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17  * USA.
  18  */
  19
  20 #include <linux/device.h>
  21 #include <linux/list.h>
  22 #include <linux/spinlock.h>
  23 #include <linux/sysfs.h>
  24 #include <linux/types.h>
  25 #include <linux/usb.h>
  26 #include <linux/usb/hcd.h>
  27 #include <linux/wait.h>
  28
  29 struct vhci_device {
  30         struct usb_device *udev;
  31
  32         /*
  33          * devid specifies a remote usb device uniquely instead
  34          * of combination of busnum and devnum.
  35          */
  36         __u32 devid;
  37
  38         /* speed of a remote device */
  39         enum usb_device_speed speed;
  40
  41         /* vhci root-hub port to which this device is attached */
  42         __u32 rhport;
  43
  44         struct usbip_device ud;
  45
  46         /* lock for the below link lists */
  47         spinlock_t priv_lock;
  48
  49         /* vhci_priv is linked to one of them. */
  50         struct list_head priv_tx;
  51         struct list_head priv_rx;
  52
  53         /* vhci_unlink is linked to one of them */
  54         struct list_head unlink_tx;
  55         struct list_head unlink_rx;
  56
  57         /* vhci_tx thread sleeps for this queue */
  58         wait_queue_head_t waitq_tx;
  59 };
  60
  61 /* urb->hcpriv, use container_of() */
  62 struct vhci_priv {
  63         unsigned long seqnum;
  64         struct list_head list;
  65
  66         struct vhci_device *vdev;
  67         struct urb *urb;
  68 };
  69
  70 struct vhci_unlink {
  71         /* seqnum of this request */
  72         unsigned long seqnum;
  73
  74         struct list_head list;
  75
  76         /* seqnum of the unlink target */
  77         unsigned long unlink_seqnum;
  78 };
  79
  80 /*
  81  * The number of ports is less than 16 ?
  82  * USB_MAXCHILDREN is statically defined to 16 in usb.h.  Its maximum value
  83  * would be 31 because the event_bits[1] of struct usb_hub is defined as
  84  * unsigned long in hub.h
  85  */
  86 #define VHCI_NPORTS 8
  87
  88 /* for usb_bus.hcpriv */
  89 struct vhci_hcd {
  90         spinlock_t lock;
  91
  92         u32 port_status[VHCI_NPORTS];
  93
  94         unsigned resuming:1;
  95         unsigned long re_timeout;
  96
  97         atomic_t seqnum;
  98
  99         /*
 100          * NOTE:
 101          * wIndex shows the port number and begins from 1.
 102          * But, the index of this array begins from 0.
 103          */
 104         struct vhci_device vdev[VHCI_NPORTS];
 105 };
 106
 107 extern struct vhci_hcd *the_controller;
 108 extern struct attribute_group dev_attr_group;
 109 #define hardware (&the_controller->pdev.dev)
 110
 111 /* vhci_hcd.c */
 112 void rh_port_connect(int rhport, enum usb_device_speed speed);
 113 void rh_port_disconnect(int rhport);
 114
 115 /* vhci_rx.c */
 116 struct urb *pickup_urb_and_free_priv(struct vhci_device *vdev, __u32 seqnum);
 117 int vhci_rx_loop(void *data);
 118
 119 /* vhci_tx.c */
 120 int vhci_tx_loop(void *data);
 121
 122 static inline struct vhci_device *port_to_vdev(__u32 port)
 123 {
 124         return &the_controller->vdev[port];
 125 }
 126
 127 static inline struct vhci_hcd *hcd_to_vhci(struct usb_hcd *hcd)
 128 {
 129         return (struct vhci_hcd *) (hcd->hcd_priv);
 130 }
 131
 132 static inline struct usb_hcd *vhci_to_hcd(struct vhci_hcd *vhci)
 133 {
 134         return container_of((void *) vhci, struct usb_hcd, hcd_priv);
 135 }
 136
 137 static inline struct device *vhci_dev(struct vhci_hcd *vhci)
 138 {
 139         return vhci_to_hcd(vhci)->self.controller;
 140 }