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/platform_device.h>
  21 #include "../../usb/core/hcd.h"
  22
  23
  24 struct vhci_device {
  25         struct usb_device *udev;
  26
  27         /*
  28          * devid specifies a remote usb device uniquely instead
  29          * of combination of busnum and devnum.
  30          */
  31         __u32 devid;
  32
  33         /* speed of a remote device */
  34         enum usb_device_speed speed;
  35
  36         /*  vhci root-hub port to which this device is attached  */
  37         __u32 rhport;
  38
  39         struct usbip_device ud;
  40
  41
  42         /* lock for the below link lists */
  43         spinlock_t priv_lock;
  44
  45         /* vhci_priv is linked to one of them. */
  46         struct list_head priv_tx;
  47         struct list_head priv_rx;
  48
  49         /* vhci_unlink is linked to one of them */
  50         struct list_head unlink_tx;
  51         struct list_head unlink_rx;
  52
  53         /* vhci_tx thread sleeps for this queue */
  54         wait_queue_head_t waitq_tx;
  55 };
  56
  57
  58 /* urb->hcpriv, use container_of() */
  59 struct vhci_priv {
  60         unsigned long seqnum;
  61         struct list_head list;
  62
  63         struct vhci_device *vdev;
  64         struct urb *urb;
  65 };
  66
  67
  68 struct vhci_unlink {
  69         /* seqnum of this request */
  70         unsigned long seqnum;
  71
  72         struct list_head list;
  73
  74         /* seqnum of the unlink target */
  75         unsigned long unlink_seqnum;
  76 };
  77
  78 /*
  79  * The number of ports is less than 16 ?
  80  * USB_MAXCHILDREN is statically defined to 16 in usb.h.  Its maximum value
  81  * would be 31 because the event_bits[1] of struct usb_hub is defined as
  82  * unsigned long in hub.h
  83  */
  84 #define VHCI_NPORTS 8
  85
  86 /* for usb_bus.hcpriv */
  87 struct vhci_hcd {
  88         spinlock_t      lock;
  89
  90         u32     port_status[VHCI_NPORTS];
  91
  92         unsigned        resuming:1;
  93         unsigned long   re_timeout;
  94
  95         atomic_t seqnum;
  96
  97         /*
  98          * NOTE:
  99          * wIndex shows the port number and begins from 1.
 100          * But, the index of this array begins from 0.
 101          */
 102         struct vhci_device vdev[VHCI_NPORTS];
 103
 104         /* vhci_device which has not been assiged its address yet */
 105         int pending_port;
 106 };
 107
 108
 109 extern struct vhci_hcd *the_controller;
 110 extern struct attribute_group dev_attr_group;
 111
 112
 113 /*-------------------------------------------------------------------------*/
 114 /* prototype declaration */
 115
 116 /* vhci_hcd.c */
 117 void rh_port_connect(int rhport, enum usb_device_speed speed);
 118 void rh_port_disconnect(int rhport);
 119 void vhci_rx_loop(struct usbip_task *ut);
 120 void vhci_tx_loop(struct usbip_task *ut);
 121
 122 #define hardware                (&the_controller->pdev.dev)
 123
 124 static inline struct vhci_device *port_to_vdev(__u32 port)
 125 {
 126         return &the_controller->vdev[port];
 127 }
 128
 129 static inline struct vhci_hcd *hcd_to_vhci(struct usb_hcd *hcd)
 130 {
 131         return (struct vhci_hcd *) (hcd->hcd_priv);
 132 }
 133
 134 static inline struct usb_hcd *vhci_to_hcd(struct vhci_hcd *vhci)
 135 {
 136         return container_of((void *) vhci, struct usb_hcd, hcd_priv);
 137 }
 138
 139 static inline struct device *vhci_dev(struct vhci_hcd *vhci)
 140 {
 141         return vhci_to_hcd(vhci)->self.controller;
 142 }