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