drivers/staging/usbip/stub.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 #ifndef __USBIP_STUB_H
  21 #define __USBIP_STUB_H
  22
  23 #include <linux/list.h>
  24 #include <linux/slab.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/types.h>
  27 #include <linux/usb.h>
  28 #include <linux/wait.h>
  29
  30 #define STUB_BUSID_OTHER 0
  31 #define STUB_BUSID_REMOV 1
  32 #define STUB_BUSID_ADDED 2
  33 #define STUB_BUSID_ALLOC 3
  34
  35 struct stub_device {
  36         struct usb_interface *interface;
  37         struct usb_device *udev;
  38
  39         struct usbip_device ud;
  40         __u32 devid;
  41
  42         /*
  43          * stub_priv preserves private data of each urb.
  44          * It is allocated as stub_priv_cache and assigned to urb->context.
  45          *
  46          * stub_priv is always linked to any one of 3 lists;
  47          *      priv_init: linked to this until the comletion of a urb.
  48          *      priv_tx  : linked to this after the completion of a urb.
  49          *      priv_free: linked to this after the sending of the result.
  50          *
  51          * Any of these list operations should be locked by priv_lock.
  52          */
  53         spinlock_t priv_lock;
  54         struct list_head priv_init;
  55         struct list_head priv_tx;
  56         struct list_head priv_free;
  57
  58         /* see comments for unlinking in stub_rx.c */
  59         struct list_head unlink_tx;
  60         struct list_head unlink_free;
  61
  62         wait_queue_head_t tx_waitq;
  63 };
  64
  65 /* private data into urb->priv */
  66 struct stub_priv {
  67         unsigned long seqnum;
  68         struct list_head list;
  69         struct stub_device *sdev;
  70         struct urb *urb;
  71
  72         int unlinking;
  73 };
  74
  75 struct stub_unlink {
  76         unsigned long seqnum;
  77         struct list_head list;
  78         __u32 status;
  79 };
  80
  81 /* same as SYSFS_BUS_ID_SIZE */
  82 #define BUSID_SIZE 32
  83
  84 struct bus_id_priv {
  85         char name[BUSID_SIZE];
  86         char status;
  87         int interf_count;
  88         struct stub_device *sdev;
  89         char shutdown_busid;
  90 };
  91
  92 /* stub_priv is allocated from stub_priv_cache */
  93 extern struct kmem_cache *stub_priv_cache;
  94
  95 /* stub_dev.c */
  96 extern struct usb_driver stub_driver;
  97
  98 /* stub_main.c */
  99 struct bus_id_priv *get_busid_priv(const char *busid);
 100 int del_match_busid(char *busid);
 101 void stub_device_cleanup_urbs(struct stub_device *sdev);
 102
 103 /* stub_rx.c */
 104 int stub_rx_loop(void *data);
 105
 106 /* stub_tx.c */
 107 void stub_enqueue_ret_unlink(struct stub_device *sdev, __u32 seqnum,
 108                              __u32 status);
 109 void stub_complete(struct urb *urb);
 110 int stub_tx_loop(void *data);
 111
 112 #endif /* __USBIP_STUB_H */