Staging: USB/IP: add client driver

	  module will be called usbip_common_mod.

	  If unsure, say N.

config USB_IP_VHCI_HCD

	tristate "USB IP client driver"

	depends on USB_IP_COMMON

	default N

	---help---

	 This enables the USB IP host controller driver which will

	 run on the client machine.

	 To compile this driver as a module, choose M here: the

	 module will be called vhci_hcd.

obj-$(CONFIG_USB_IP_COMMON) += usbip_common_mod.o

usbip_common_mod-objs := usbip_common.o usbip_event.o

obj-$(CONFIG_USB_IP_VHCI_HCD) += vhci-hcd.o

vhci-hcd-objs := vhci_sysfs.o vhci_tx.o vhci_rx.o vhci_hcd.o

ifeq ($(CONFIG_USB_DEBUG),y)

	EXTRA_CFLAGS += -DDEBUG

endif

/*

 * Copyright (C) 2003-2008 Takahiro Hirofuchi

 *

 * This is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,

 * USA.

 */

#include <linux/platform_device.h>

#include "../../usb/core/hcd.h"

struct vhci_device {

	struct usb_device *udev;

	/*

	 * devid specifies a remote usb device uniquely instead

	 * of combination of busnum and devnum.

	 */

	__u32 devid;

	/* speed of a remote device */

	enum usb_device_speed speed;

	/*  vhci root-hub port to which this device is attached  */

	__u32 rhport;

	struct usbip_device ud;

	/* lock for the below link lists */

	spinlock_t priv_lock;

	/* vhci_priv is linked to one of them. */

	struct list_head priv_tx;

	struct list_head priv_rx;

	/* vhci_unlink is linked to one of them */

	struct list_head unlink_tx;

	struct list_head unlink_rx;

	/* vhci_tx thread sleeps for this queue */

	wait_queue_head_t waitq_tx;

};

/* urb->hcpriv, use container_of() */

struct vhci_priv {

	unsigned long seqnum;

	struct list_head list;

	struct vhci_device *vdev;

	struct urb *urb;

};

struct vhci_unlink {

	/* seqnum of this request */

	unsigned long seqnum;

	struct list_head list;

	/* seqnum of the unlink target */

	unsigned long unlink_seqnum;

};

/*

 * The number of ports is less than 16 ?

 * USB_MAXCHILDREN is statically defined to 16 in usb.h.  Its maximum value

 * would be 31 because the event_bits[1] of struct usb_hub is defined as

 * unsigned long in hub.h

 */

#define VHCI_NPORTS 8

/* for usb_bus.hcpriv */

struct vhci_hcd {

	spinlock_t	lock;

	u32	port_status[VHCI_NPORTS];

	unsigned	resuming:1;

	unsigned long	re_timeout;

	atomic_t seqnum;

	/*

	 * NOTE:

	 * wIndex shows the port number and begins from 1.

	 * But, the index of this array begins from 0.

	 */

	struct vhci_device vdev[VHCI_NPORTS];

	/* vhci_device which has not been assiged its address yet */

	int pending_port;

};

extern struct vhci_hcd *the_controller;

extern struct attribute_group dev_attr_group;

/*-------------------------------------------------------------------------*/

/* prototype declaration */

/* vhci_hcd.c */

void rh_port_connect(int rhport, enum usb_device_speed speed);

void rh_port_disconnect(int rhport);

void vhci_rx_loop(struct usbip_task *ut);

void vhci_tx_loop(struct usbip_task *ut);

#define hardware		(&the_controller->pdev.dev)

static inline struct vhci_device *port_to_vdev(__u32 port)

{

	return &the_controller->vdev[port];

}

static inline struct vhci_hcd *hcd_to_vhci(struct usb_hcd *hcd)

{

	return (struct vhci_hcd *) (hcd->hcd_priv);

}

static inline struct usb_hcd *vhci_to_hcd(struct vhci_hcd *vhci)

{

	return container_of((void *) vhci, struct usb_hcd, hcd_priv);

}

static inline struct device *vhci_dev(struct vhci_hcd *vhci)

{

	return vhci_to_hcd(vhci)->self.controller;

}