Staging: USB/IP: add client driver

This adds the USB IP client driver

Brian Merrell cleaned up a lot of this code and submitted it for
inclusion.  Greg also did a lot of cleanup.

Signed-off-by: Brian G. Merrell <bgmerrell@novell.com>
Cc: Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 142 insertions, 0 deletions

diff --git a/drivers/staging/usbip/vhci.h b/drivers/staging/usbip/vhci.h
new file mode 100644
index 00000000000..5e375173bbc
--- /dev/null
+++ b/drivers/staging/usbip/vhci.h
@@ -0,0 +1,142 @@
+/*
+ * 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;
+}