Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1793 insertions, 0 deletions

diff --git a/drivers/usb/gadget/dummy_hcd.c b/drivers/usb/gadget/dummy_hcd.c
new file mode 100644
index 000000000000..8ef8a9cd9ac4
--- /dev/null
+++ b/drivers/usb/gadget/dummy_hcd.c
@@ -0,0 +1,1793 @@
+/*
+ * dummy_hcd.c -- Dummy/Loopback USB host and device emulator driver.
+ *
+ * Maintainer: Alan Stern <stern@rowland.harvard.edu>
+ *
+ * Copyright (C) 2003 David Brownell
+ * Copyright (C) 2003-2005 Alan Stern
+ *
+ * This program 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 program 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
+ */
+
+
+/*
+ * This exposes a device side "USB gadget" API, driven by requests to a
+ * Linux-USB host controller driver.  USB traffic is simulated; there's
+ * no need for USB hardware.  Use this with two other drivers:
+ *
+ *  - Gadget driver, responding to requests (slave);
+ *  - Host-side device driver, as already familiar in Linux.
+ *
+ * Having this all in one kernel can help some stages of development,
+ * bypassing some hardware (and driver) issues.  UML could help too.
+ */
+
+#define DEBUG
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/smp_lock.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/timer.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/version.h>
+
+#include <linux/usb.h>
+#include <linux/usb_gadget.h>
+
+#include <asm/byteorder.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/system.h>
+#include <asm/unaligned.h>
+
+
+#include "../core/hcd.h"
+
+
+#define DRIVER_DESC	"USB Host+Gadget Emulator"
+#define DRIVER_VERSION	"17 Dec 2004"
+
+static const char	driver_name [] = "dummy_hcd";
+static const char	driver_desc [] = "USB Host+Gadget Emulator";
+
+static const char	gadget_name [] = "dummy_udc";
+
+MODULE_DESCRIPTION (DRIVER_DESC);
+MODULE_AUTHOR ("David Brownell");
+MODULE_LICENSE ("GPL");
+
+/*-------------------------------------------------------------------------*/
+
+/* gadget side driver data structres */
+struct dummy_ep {
+	struct list_head		queue;
+	unsigned long			last_io;	/* jiffies timestamp */
+	struct usb_gadget		*gadget;
+	const struct usb_endpoint_descriptor *desc;
+	struct usb_ep			ep;
+	unsigned			halted : 1;
+	unsigned			already_seen : 1;
+	unsigned			setup_stage : 1;
+};
+
+struct dummy_request {
+	struct list_head		queue;		/* ep's requests */
+	struct usb_request		req;
+};
+
+static inline struct dummy_ep *usb_ep_to_dummy_ep (struct usb_ep *_ep)
+{
+	return container_of (_ep, struct dummy_ep, ep);
+}
+
+static inline struct dummy_request *usb_request_to_dummy_request
+		(struct usb_request *_req)
+{
+	return container_of (_req, struct dummy_request, req);
+}
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Every device has ep0 for control requests, plus up to 30 more endpoints,
+ * in one of two types:
+ *
+ *   - Configurable:  direction (in/out), type (bulk, iso, etc), and endpoint
+ *     number can be changed.  Names like "ep-a" are used for this type.
+ *
+ *   - Fixed Function:  in other cases.  some characteristics may be mutable;
+ *     that'd be hardware-specific.  Names like "ep12out-bulk" are used.
+ *
+ * Gadget drivers are responsible for not setting up conflicting endpoint
+ * configurations, illegal or unsupported packet lengths, and so on.
+ */
+
+static const char ep0name [] = "ep0";
+
+static const char *const ep_name [] = {
+	ep0name,				/* everyone has ep0 */
+
+	/* act like a net2280: high speed, six configurable endpoints */
+	"ep-a", "ep-b", "ep-c", "ep-d", "ep-e", "ep-f",
+
+	/* or like pxa250: fifteen fixed function endpoints */
+	"ep1in-bulk", "ep2out-bulk", "ep3in-iso", "ep4out-iso", "ep5in-int",
+	"ep6in-bulk", "ep7out-bulk", "ep8in-iso", "ep9out-iso", "ep10in-int",
+	"ep11in-bulk", "ep12out-bulk", "ep13in-iso", "ep14out-iso",
+		"ep15in-int",
+
+	/* or like sa1100: two fixed function endpoints */
+	"ep1out-bulk", "ep2in-bulk",
+};
+#define DUMMY_ENDPOINTS	(sizeof(ep_name)/sizeof(char *))
+
+#define FIFO_SIZE		64
+
+struct urbp {
+	struct urb		*urb;
+	struct list_head	urbp_list;
+};
+
+struct dummy {
+	spinlock_t			lock;
+
+	/*
+	 * SLAVE/GADGET side support
+	 */
+	struct dummy_ep			ep [DUMMY_ENDPOINTS];
+	int				address;
+	struct usb_gadget		gadget;
+	struct usb_gadget_driver	*driver;
+	struct dummy_request		fifo_req;
+	u8				fifo_buf [FIFO_SIZE];
+	u16				devstatus;
+
+	/*
+	 * MASTER/HOST side support
+	 */
+	struct timer_list		timer;
+	u32				port_status;
+	unsigned			resuming:1;
+	unsigned long			re_timeout;
+
+	struct usb_device		*udev;
+	struct list_head		urbp_list;
+};
+
+static inline struct dummy *hcd_to_dummy (struct usb_hcd *hcd)
+{
+	return (struct dummy *) (hcd->hcd_priv);
+}
+
+static inline struct usb_hcd *dummy_to_hcd (struct dummy *dum)
+{
+	return container_of((void *) dum, struct usb_hcd, hcd_priv);
+}
+
+static inline struct device *dummy_dev (struct dummy *dum)
+{
+	return dummy_to_hcd(dum)->self.controller;
+}
+
+static inline struct dummy *ep_to_dummy (struct dummy_ep *ep)
+{
+	return container_of (ep->gadget, struct dummy, gadget);
+}
+
+static inline struct dummy *gadget_to_dummy (struct usb_gadget *gadget)
+{
+	return container_of (gadget, struct dummy, gadget);
+}
+
+static inline struct dummy *gadget_dev_to_dummy (struct device *dev)
+{
+	return container_of (dev, struct dummy, gadget.dev);
+}
+
+static struct dummy			*the_controller;
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * This "hardware" may look a bit odd in diagnostics since it's got both
+ * host and device sides; and it binds different drivers to each side.
+ */
+static struct platform_device		the_pdev;
+
+static struct device_driver dummy_driver = {
+	.name		= (char *) driver_name,
+	.bus		= &platform_bus_type,
+};
+
+/*-------------------------------------------------------------------------*/
+
+/* SLAVE/GADGET SIDE DRIVER
+ *
+ * This only tracks gadget state.  All the work is done when the host
+ * side tries some (emulated) i/o operation.  Real device controller
+ * drivers would do real i/o using dma, fifos, irqs, timers, etc.
+ */
+
+#define is_enabled(dum) \
+	(dum->port_status & USB_PORT_STAT_ENABLE)
+
+static int
+dummy_enable (struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
+{
+	struct dummy		*dum;
+	struct dummy_ep		*ep;
+	unsigned		max;
+	int			retval;
+
+	ep = usb_ep_to_dummy_ep (_ep);
+	if (!_ep || !desc || ep->desc || _ep->name == ep0name
+			|| desc->bDescriptorType != USB_DT_ENDPOINT)
+		return -EINVAL;
+	dum = ep_to_dummy (ep);
+	if (!dum->driver || !is_enabled (dum))
+		return -ESHUTDOWN;
+	max = le16_to_cpu(desc->wMaxPacketSize) & 0x3ff;
+
+	/* drivers must not request bad settings, since lower levels
+	 * (hardware or its drivers) may not check.  some endpoints
+	 * can't do iso, many have maxpacket limitations, etc.
+	 *
+	 * since this "hardware" driver is here to help debugging, we
+	 * have some extra sanity checks.  (there could be more though,
+	 * especially for "ep9out" style fixed function ones.)
+	 */
+	retval = -EINVAL;
+	switch (desc->bmAttributes & 0x03) {
+	case USB_ENDPOINT_XFER_BULK:
+		if (strstr (ep->ep.name, "-iso")
+				|| strstr (ep->ep.name, "-int")) {
+			goto done;
+		}
+		switch (dum->gadget.speed) {
+		case USB_SPEED_HIGH:
+			if (max == 512)
+				break;
+			/* conserve return statements */
+		default:
+			switch (max) {
+			case 8: case 16: case 32: case 64:
+				/* we'll fake any legal size */
+				break;
+			default:
+		case USB_SPEED_LOW:
+				goto done;
+			}
+		}
+		break;
+	case USB_ENDPOINT_XFER_INT:
+		if (strstr (ep->ep.name, "-iso")) /* bulk is ok */
+			goto done;
+		/* real hardware might not handle all packet sizes */
+		switch (dum->gadget.speed) {
+		case USB_SPEED_HIGH:
+			if (max <= 1024)
+				break;
+			/* save a return statement */
+		case USB_SPEED_FULL:
+			if (max <= 64)
+				break;
+			/* save a return statement */
+		default:
+			if (max <= 8)
+				break;
+			goto done;
+		}
+		break;
+	case USB_ENDPOINT_XFER_ISOC:
+		if (strstr (ep->ep.name, "-bulk")
+				|| strstr (ep->ep.name, "-int"))
+			goto done;
+		/* real hardware might not handle all packet sizes */
+		switch (dum->gadget.speed) {
+		case USB_SPEED_HIGH:
+			if (max <= 1024)
+				break;
+			/* save a return statement */
+		case USB_SPEED_FULL:
+			if (max <= 1023)
+				break;
+			/* save a return statement */
+		default:
+			goto done;
+		}
+		break;
+	default:
+		/* few chips support control except on ep0 */
+		goto done;
+	}
+
+	_ep->maxpacket = max;
+	ep->desc = desc;
+
+	dev_dbg (dummy_dev(dum), "enabled %s (ep%d%s-%s) maxpacket %d\n",
+		_ep->name,
+		desc->bEndpointAddress & 0x0f,
+		(desc->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
+		({ char *val;
+		 switch (desc->bmAttributes & 0x03) {
+		 case USB_ENDPOINT_XFER_BULK: val = "bulk"; break;
+		 case USB_ENDPOINT_XFER_ISOC: val = "iso"; break;
+		 case USB_ENDPOINT_XFER_INT: val = "intr"; break;
+		 default: val = "ctrl"; break;
+		 }; val; }),
+		max);
+
+	/* at this point real hardware should be NAKing transfers
+	 * to that endpoint, until a buffer is queued to it.
+	 */
+	retval = 0;
+done:
+	return retval;
+}
+
+/* called with spinlock held */
+static void nuke (struct dummy *dum, struct dummy_ep *ep)
+{
+	while (!list_empty (&ep->queue)) {
+		struct dummy_request	*req;
+
+		req = list_entry (ep->queue.next, struct dummy_request, queue);
+		list_del_init (&req->queue);
+		req->req.status = -ESHUTDOWN;
+
+		spin_unlock (&dum->lock);
+		req->req.complete (&ep->ep, &req->req);
+		spin_lock (&dum->lock);
+	}
+}
+
+static int dummy_disable (struct usb_ep *_ep)
+{
+	struct dummy_ep		*ep;
+	struct dummy		*dum;
+	unsigned long		flags;
+	int			retval;
+
+	ep = usb_ep_to_dummy_ep (_ep);
+	if (!_ep || !ep->desc || _ep->name == ep0name)
+		return -EINVAL;
+	dum = ep_to_dummy (ep);
+
+	spin_lock_irqsave (&dum->lock, flags);
+	ep->desc = NULL;
+	retval = 0;
+	nuke (dum, ep);
+	spin_unlock_irqrestore (&dum->lock, flags);
+
+	dev_dbg (dummy_dev(dum), "disabled %s\n", _ep->name);
+	return retval;
+}
+
+static struct usb_request *
+dummy_alloc_request (struct usb_ep *_ep, int mem_flags)
+{
+	struct dummy_ep		*ep;
+	struct dummy_request	*req;
+
+	if (!_ep)
+		return NULL;
+	ep = usb_ep_to_dummy_ep (_ep);
+
+	req = kmalloc (sizeof *req, mem_flags);
+	if (!req)
+		return NULL;
+	memset (req, 0, sizeof *req);
+	INIT_LIST_HEAD (&req->queue);
+	return &req->req;
+}
+
+static void
+dummy_free_request (struct usb_ep *_ep, struct usb_request *_req)
+{
+	struct dummy_ep		*ep;
+	struct dummy_request	*req;
+
+	ep = usb_ep_to_dummy_ep (_ep);
+	if (!ep || !_req || (!ep->desc && _ep->name != ep0name))
+		return;
+
+	req = usb_request_to_dummy_request (_req);
+	WARN_ON (!list_empty (&req->queue));
+	kfree (req);
+}
+
+static void *
+dummy_alloc_buffer (
+	struct usb_ep *_ep,
+	unsigned bytes,
+	dma_addr_t *dma,
+	int mem_flags
+) {
+	char			*retval;
+	struct dummy_ep		*ep;
+	struct dummy		*dum;
+
+	ep = usb_ep_to_dummy_ep (_ep);
+	dum = ep_to_dummy (ep);
+
+	if (!dum->driver)
+		return NULL;
+	retval = kmalloc (bytes, mem_flags);
+	*dma = (dma_addr_t) retval;
+	return retval;
+}
+
+static void
+dummy_free_buffer (
+	struct usb_ep *_ep,
+	void *buf,
+	dma_addr_t dma,
+	unsigned bytes
+) {
+	if (bytes)
+		kfree (buf);
+}
+
+static void
+fifo_complete (struct usb_ep *ep, struct usb_request *req)
+{
+}
+
+static int
+dummy_queue (struct usb_ep *_ep, struct usb_request *_req, int mem_flags)
+{
+	struct dummy_ep		*ep;
+	struct dummy_request	*req;
+	struct dummy		*dum;
+	unsigned long		flags;
+
+	req = usb_request_to_dummy_request (_req);
+	if (!_req || !list_empty (&req->queue) || !_req->complete)
+		return -EINVAL;
+
+	ep = usb_ep_to_dummy_ep (_ep);
+	if (!_ep || (!ep->desc && _ep->name != ep0name))
+		return -EINVAL;
+
+	dum = ep_to_dummy (ep);
+	if (!dum->driver || !is_enabled (dum))
+		return -ESHUTDOWN;
+
+#if 0
+	dev_dbg (dummy_dev(dum), "ep %p queue req %p to %s, len %d buf %p\n",
+			ep, _req, _ep->name, _req->length, _req->buf);
+#endif
+
+	_req->status = -EINPROGRESS;
+	_req->actual = 0;
+	spin_lock_irqsave (&dum->lock, flags);
+
+	/* implement an emulated single-request FIFO */
+	if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
+			list_empty (&dum->fifo_req.queue) &&
+			list_empty (&ep->queue) &&
+			_req->length <= FIFO_SIZE) {
+		req = &dum->fifo_req;
+		req->req = *_req;
+		req->req.buf = dum->fifo_buf;
+		memcpy (dum->fifo_buf, _req->buf, _req->length);
+		req->req.context = dum;
+		req->req.complete = fifo_complete;
+
+		spin_unlock (&dum->lock);
+		_req->actual = _req->length;
+		_req->status = 0;
+		_req->complete (_ep, _req);
+		spin_lock (&dum->lock);
+	}
+	list_add_tail (&req->queue, &ep->queue);
+	spin_unlock_irqrestore (&dum->lock, flags);
+
+	/* real hardware would likely enable transfers here, in case
+	 * it'd been left NAKing.
+	 */
+	return 0;
+}
+
+static int dummy_dequeue (struct usb_ep *_ep, struct usb_request *_req)
+{
+	struct dummy_ep		*ep;
+	struct dummy		*dum;
+	int			retval = -EINVAL;
+	unsigned long		flags;
+	struct dummy_request	*req = NULL;
+
+	if (!_ep || !_req)
+		return retval;
+	ep = usb_ep_to_dummy_ep (_ep);
+	dum = ep_to_dummy (ep);
+
+	if (!dum->driver)
+		return -ESHUTDOWN;
+
+	spin_lock_irqsave (&dum->lock, flags);
+	list_for_each_entry (req, &ep->queue, queue) {
+		if (&req->req == _req) {
+			list_del_init (&req->queue);
+			_req->status = -ECONNRESET;
+			retval = 0;
+			break;
+		}
+	}
+	spin_unlock_irqrestore (&dum->lock, flags);
+
+	if (retval == 0) {
+		dev_dbg (dummy_dev(dum),
+				"dequeued req %p from %s, len %d buf %p\n",
+				req, _ep->name, _req->length, _req->buf);
+		_req->complete (_ep, _req);
+	}
+	return retval;
+}
+
+static int
+dummy_set_halt (struct usb_ep *_ep, int value)
+{
+	struct dummy_ep		*ep;
+	struct dummy		*dum;
+
+	if (!_ep)
+		return -EINVAL;
+	ep = usb_ep_to_dummy_ep (_ep);
+	dum = ep_to_dummy (ep);
+	if (!dum->driver)
+		return -ESHUTDOWN;
+	if (!value)
+		ep->halted = 0;
+	else if (ep->desc && (ep->desc->bEndpointAddress & USB_DIR_IN) &&
+			!list_empty (&ep->queue))
+		return -EAGAIN;
+	else
+		ep->halted = 1;
+	/* FIXME clear emulated data toggle too */
+	return 0;
+}
+
+static const struct usb_ep_ops dummy_ep_ops = {
+	.enable		= dummy_enable,
+	.disable	= dummy_disable,
+
+	.alloc_request	= dummy_alloc_request,
+	.free_request	= dummy_free_request,
+
+	.alloc_buffer	= dummy_alloc_buffer,
+	.free_buffer	= dummy_free_buffer,
+	/* map, unmap, ... eventually hook the "generic" dma calls */
+
+	.queue		= dummy_queue,
+	.dequeue	= dummy_dequeue,
+
+	.set_halt	= dummy_set_halt,
+};
+
+/*-------------------------------------------------------------------------*/
+
+/* there are both host and device side versions of this call ... */
+static int dummy_g_get_frame (struct usb_gadget *_gadget)
+{
+	struct timeval	tv;
+
+	do_gettimeofday (&tv);
+	return tv.tv_usec / 1000;
+}
+
+static int dummy_wakeup (struct usb_gadget *_gadget)
+{
+	struct dummy	*dum;
+
+	dum = gadget_to_dummy (_gadget);
+	if ((dum->devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) == 0
+			|| !(dum->port_status & (1 << USB_PORT_FEAT_SUSPEND)))
+		return -EINVAL;
+
+	/* hub notices our request, issues downstream resume, etc */
+	dum->resuming = 1;
+	dum->port_status |= (1 << USB_PORT_FEAT_C_SUSPEND);
+	return 0;
+}
+
+static int dummy_set_selfpowered (struct usb_gadget *_gadget, int value)
+{
+	struct dummy	*dum;
+
+	dum = gadget_to_dummy (_gadget);
+	if (value)
+		dum->devstatus |= (1 << USB_DEVICE_SELF_POWERED);
+	else
+		dum->devstatus &= ~(1 << USB_DEVICE_SELF_POWERED);
+	return 0;
+}
+
+static const struct usb_gadget_ops dummy_ops = {
+	.get_frame	= dummy_g_get_frame,
+	.wakeup		= dummy_wakeup,
+	.set_selfpowered = dummy_set_selfpowered,
+};
+
+/*-------------------------------------------------------------------------*/
+
+/* "function" sysfs attribute */
+static ssize_t
+show_function (struct device *dev, char *buf)
+{
+	struct dummy	*dum = gadget_dev_to_dummy (dev);
+
+	if (!dum->driver || !dum->driver->function)
+		return 0;
+	return scnprintf (buf, PAGE_SIZE, "%s\n", dum->driver->function);
+}
+DEVICE_ATTR (function, S_IRUGO, show_function, NULL);
+
+/*-------------------------------------------------------------------------*/
+
+/*
+ * Driver registration/unregistration.
+ *
+ * This is basically hardware-specific; there's usually only one real USB
+ * device (not host) controller since that's how USB devices are intended
+ * to work.  So most implementations of these api calls will rely on the
+ * fact that only one driver will ever bind to the hardware.  But curious
+ * hardware can be built with discrete components, so the gadget API doesn't
+ * require that assumption.
+ *
+ * For this emulator, it might be convenient to create a usb slave device
+ * for each driver that registers:  just add to a big root hub.
+ */
+
+static void
+dummy_udc_release (struct device *dev)
+{
+}
+
+static void
+dummy_pdev_release (struct device *dev)
+{
+}
+
+static int
+dummy_register_udc (struct dummy *dum)
+{
+	int		rc;
+
+	strcpy (dum->gadget.dev.bus_id, "udc");
+	dum->gadget.dev.parent = dummy_dev(dum);
+	dum->gadget.dev.release = dummy_udc_release;
+
+	rc = device_register (&dum->gadget.dev);
+	if (rc == 0)
+		device_create_file (&dum->gadget.dev, &dev_attr_function);
+	return rc;
+}
+
+static void
+dummy_unregister_udc (struct dummy *dum)
+{
+	device_remove_file (&dum->gadget.dev, &dev_attr_function);
+	device_unregister (&dum->gadget.dev);
+}
+
+int
+usb_gadget_register_driver (struct usb_gadget_driver *driver)
+{
+	struct dummy	*dum = the_controller;
+	int		retval, i;
+
+	if (!dum)
+		return -EINVAL;
+	if (dum->driver)
+		return -EBUSY;
+	if (!driver->bind || !driver->unbind || !driver->setup
+			|| driver->speed == USB_SPEED_UNKNOWN)
+		return -EINVAL;
+
+	/*
+	 * SLAVE side init ... the layer above hardware, which
+	 * can't enumerate without help from the driver we're binding.
+	 */
+	dum->gadget.name = gadget_name;
+	dum->gadget.ops = &dummy_ops;
+	dum->gadget.is_dualspeed = 1;
+
+	dum->devstatus = 0;
+	dum->resuming = 0;
+
+	INIT_LIST_HEAD (&dum->gadget.ep_list);
+	for (i = 0; i < DUMMY_ENDPOINTS; i++) {
+		struct dummy_ep	*ep = &dum->ep [i];
+
+		if (!ep_name [i])
+			break;
+		ep->ep.name = ep_name [i];
+		ep->ep.ops = &dummy_ep_ops;
+		list_add_tail (&ep->ep.ep_list, &dum->gadget.ep_list);
+		ep->halted = ep->already_seen = ep->setup_stage = 0;
+		ep->ep.maxpacket = ~0;
+		ep->last_io = jiffies;
+		ep->gadget = &dum->gadget;
+		ep->desc = NULL;
+		INIT_LIST_HEAD (&ep->queue);
+	}
+
+	dum->gadget.ep0 = &dum->ep [0].ep;
+	dum->ep [0].ep.maxpacket = 64;
+	list_del_init (&dum->ep [0].ep.ep_list);
+	INIT_LIST_HEAD(&dum->fifo_req.queue);
+
+	dum->driver = driver;
+	dum->gadget.dev.driver = &driver->driver;
+	dev_dbg (dummy_dev(dum), "binding gadget driver '%s'\n",
+			driver->driver.name);
+	if ((retval = driver->bind (&dum->gadget)) != 0) {
+		dum->driver = NULL;
+		dum->gadget.dev.driver = NULL;
+		return retval;
+	}
+
+	// FIXME: Check these calls for errors and re-order
+	driver->driver.bus = dum->gadget.dev.parent->bus;
+	driver_register (&driver->driver);
+
+	device_bind_driver (&dum->gadget.dev);
+
+	/* khubd will enumerate this in a while */
+	dum->port_status |= USB_PORT_STAT_CONNECTION
+		| (1 << USB_PORT_FEAT_C_CONNECTION);
+	return 0;
+}
+EXPORT_SYMBOL (usb_gadget_register_driver);
+
+/* caller must hold lock */
+static void
+stop_activity (struct dummy *dum, struct usb_gadget_driver *driver)
+{
+	struct dummy_ep	*ep;
+
+	/* prevent any more requests */
+	dum->address = 0;
+
+	/* The timer is left running so that outstanding URBs can fail */
+
+	/* nuke any pending requests first, so driver i/o is quiesced */
+	list_for_each_entry (ep, &dum->gadget.ep_list, ep.ep_list)
+		nuke (dum, ep);
+
+	/* driver now does any non-usb quiescing necessary */
+	if (driver) {
+		spin_unlock (&dum->lock);
+		driver->disconnect (&dum->gadget);
+		spin_lock (&dum->lock);
+	}
+}
+
+int
+usb_gadget_unregister_driver (struct usb_gadget_driver *driver)
+{
+	struct dummy	*dum = the_controller;
+	unsigned long	flags;
+
+	if (!dum)
+		return -ENODEV;
+	if (!driver || driver != dum->driver)
+		return -EINVAL;
+
+	dev_dbg (dummy_dev(dum), "unregister gadget driver '%s'\n",
+			driver->driver.name);
+
+	spin_lock_irqsave (&dum->lock, flags);
+	stop_activity (dum, driver);
+	dum->port_status &= ~(USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE |
+			USB_PORT_STAT_LOW_SPEED | USB_PORT_STAT_HIGH_SPEED);
+	dum->port_status |= (1 << USB_PORT_FEAT_C_CONNECTION);
+	spin_unlock_irqrestore (&dum->lock, flags);
+
+	driver->unbind (&dum->gadget);
+	dum->driver = NULL;
+
+	device_release_driver (&dum->gadget.dev);
+
+	driver_unregister (&driver->driver);
+
+	return 0;
+}
+EXPORT_SYMBOL (usb_gadget_unregister_driver);
+
+#undef is_enabled
+
+int net2280_set_fifo_mode (struct usb_gadget *gadget, int mode)
+{
+	return -ENOSYS;
+}
+EXPORT_SYMBOL (net2280_set_fifo_mode);
+
+/*-------------------------------------------------------------------------*/
+
+/* MASTER/HOST SIDE DRIVER
+ *
+ * this uses the hcd framework to hook up to host side drivers.
+ * its root hub will only have one device, otherwise it acts like
+ * a normal host controller.
+ *
+ * when urbs are queued, they're just stuck on a list that we
+ * scan in a timer callback.  that callback connects writes from
+ * the host with reads from the device, and so on, based on the
+ * usb 2.0 rules.
+ */
+
+static int dummy_urb_enqueue (
+	struct usb_hcd			*hcd,
+	struct usb_host_endpoint	*ep,
+	struct urb			*urb,
+	int				mem_flags
+) {
+	struct dummy	*dum;
+	struct urbp	*urbp;
+	unsigned long	flags;
+
+	if (!urb->transfer_buffer && urb->transfer_buffer_length)
+		return -EINVAL;
+
+	urbp = kmalloc (sizeof *urbp, mem_flags);
+	if (!urbp)
+		return -ENOMEM;
+	urbp->urb = urb;
+
+	dum = hcd_to_dummy (hcd);
+	spin_lock_irqsave (&dum->lock, flags);
+
+	if (!dum->udev) {
+		dum->udev = urb->dev;
+		usb_get_dev (dum->udev);
+	} else if (unlikely (dum->udev != urb->dev))
+		dev_err (dummy_dev(dum), "usb_device address has changed!\n");
+
+	list_add_tail (&urbp->urbp_list, &dum->urbp_list);
+	urb->hcpriv = urbp;
+	if (usb_pipetype (urb->pipe) == PIPE_CONTROL)
+		urb->error_count = 1;		/* mark as a new urb */
+
+	/* kick the scheduler, it'll do the rest */
+	if (!timer_pending (&dum->timer))
+		mod_timer (&dum->timer, jiffies + 1);
+
+	spin_unlock_irqrestore (&dum->lock, flags);
+	return 0;
+}
+
+static int dummy_urb_dequeue (struct usb_hcd *hcd, struct urb *urb)
+{
+	/* giveback happens automatically in timer callback */
+	return 0;
+}
+
+static void maybe_set_status (struct urb *urb, int status)
+{
+	spin_lock (&urb->lock);
+	if (urb->status == -EINPROGRESS)
+		urb->status = status;
+	spin_unlock (&urb->lock);
+}
+
+/* transfer up to a frame's worth; caller must own lock */
+static int
+transfer (struct dummy *dum, struct urb *urb, struct dummy_ep *ep, int limit)
+{
+	struct dummy_request	*req;
+
+top:
+	/* if there's no request queued, the device is NAKing; return */
+	list_for_each_entry (req, &ep->queue, queue) {
+		unsigned	host_len, dev_len, len;
+		int		is_short, to_host;
+		int		rescan = 0;
+
+		/* 1..N packets of ep->ep.maxpacket each ... the last one
+		 * may be short (including zero length).
+		 *
+		 * writer can send a zlp explicitly (length 0) or implicitly
+		 * (length mod maxpacket zero, and 'zero' flag); they always
+		 * terminate reads.
+		 */
+		host_len = urb->transfer_buffer_length - urb->actual_length;
+		dev_len = req->req.length - req->req.actual;
+		len = min (host_len, dev_len);
+
+		/* FIXME update emulated data toggle too */
+
+		to_host = usb_pipein (urb->pipe);
+		if (unlikely (len == 0))
+			is_short = 1;
+		else {
+			char		*ubuf, *rbuf;
+
+			/* not enough bandwidth left? */
+			if (limit < ep->ep.maxpacket && limit < len)
+				break;
+			len = min (len, (unsigned) limit);
+			if (len == 0)
+				break;
+
+			/* use an extra pass for the final short packet */
+			if (len > ep->ep.maxpacket) {
+				rescan = 1;
+				len -= (len % ep->ep.maxpacket);
+			}
+			is_short = (len % ep->ep.maxpacket) != 0;
+
+			/* else transfer packet(s) */
+			ubuf = urb->transfer_buffer + urb->actual_length;
+			rbuf = req->req.buf + req->req.actual;
+			if (to_host)
+				memcpy (ubuf, rbuf, len);
+			else
+				memcpy (rbuf, ubuf, len);
+			ep->last_io = jiffies;
+
+			limit -= len;
+			urb->actual_length += len;
+			req->req.actual += len;
+		}
+
+		/* short packets terminate, maybe with overflow/underflow.
+		 * it's only really an error to write too much.
+		 *
+		 * partially filling a buffer optionally blocks queue advances
+		 * (so completion handlers can clean up the queue) but we don't
+		 * need to emulate such data-in-flight.  so we only show part
+		 * of the URB_SHORT_NOT_OK effect: completion status.
+		 */
+		if (is_short) {
+			if (host_len == dev_len) {
+				req->req.status = 0;
+				maybe_set_status (urb, 0);
+			} else if (to_host) {
+				req->req.status = 0;
+				if (dev_len > host_len)
+					maybe_set_status (urb, -EOVERFLOW);
+				else
+					maybe_set_status (urb,
+						(urb->transfer_flags
+							& URB_SHORT_NOT_OK)
+						? -EREMOTEIO : 0);
+			} else if (!to_host) {
+				maybe_set_status (urb, 0);
+				if (host_len > dev_len)
+					req->req.status = -EOVERFLOW;
+				else
+					req->req.status = 0;
+			}
+
+		/* many requests terminate without a short packet */
+		} else {
+			if (req->req.length == req->req.actual
+					&& !req->req.zero)
+				req->req.status = 0;
+			if (urb->transfer_buffer_length == urb->actual_length
+					&& !(urb->transfer_flags
+						& URB_ZERO_PACKET)) {
+				maybe_set_status (urb, 0);
+			}
+		}
+
+		/* device side completion --> continuable */
+		if (req->req.status != -EINPROGRESS) {
+			list_del_init (&req->queue);
+
+			spin_unlock (&dum->lock);
+			req->req.complete (&ep->ep, &req->req);
+			spin_lock (&dum->lock);
+
+			/* requests might have been unlinked... */
+			rescan = 1;
+		}
+
+		/* host side completion --> terminate */
+		if (urb->status != -EINPROGRESS)
+			break;
+
+		/* rescan to continue with any other queued i/o */
+		if (rescan)
+			goto top;
+	}
+	return limit;
+}
+
+static int periodic_bytes (struct dummy *dum, struct dummy_ep *ep)
+{
+	int	limit = ep->ep.maxpacket;
+
+	if (dum->gadget.speed == USB_SPEED_HIGH) {
+		int	tmp;
+
+		/* high bandwidth mode */
+		tmp = le16_to_cpu(ep->desc->wMaxPacketSize);
+		tmp = le16_to_cpu (tmp);
+		tmp = (tmp >> 11) & 0x03;
+		tmp *= 8 /* applies to entire frame */;
+		limit += limit * tmp;
+	}
+	return limit;
+}
+
+#define is_active(dum)	((dum->port_status & \
+		(USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE | \
+			USB_PORT_STAT_SUSPEND)) \
+		== (USB_PORT_STAT_CONNECTION | USB_PORT_STAT_ENABLE))
+
+static struct dummy_ep *find_endpoint (struct dummy *dum, u8 address)
+{
+	int		i;
+
+	if (!is_active (dum))
+		return NULL;
+	if ((address & ~USB_DIR_IN) == 0)
+		return &dum->ep [0];
+	for (i = 1; i < DUMMY_ENDPOINTS; i++) {
+		struct dummy_ep	*ep = &dum->ep [i];
+
+		if (!ep->desc)
+			continue;
+		if (ep->desc->bEndpointAddress == address)
+			return ep;
+	}
+	return NULL;
+}
+
+#undef is_active
+
+#define Dev_Request	(USB_TYPE_STANDARD | USB_RECIP_DEVICE)
+#define Dev_InRequest	(Dev_Request | USB_DIR_IN)
+#define Intf_Request	(USB_TYPE_STANDARD | USB_RECIP_INTERFACE)
+#define Intf_InRequest	(Intf_Request | USB_DIR_IN)
+#define Ep_Request	(USB_TYPE_STANDARD | USB_RECIP_ENDPOINT)
+#define Ep_InRequest	(Ep_Request | USB_DIR_IN)
+
+/* drive both sides of the transfers; looks like irq handlers to
+ * both drivers except the callbacks aren't in_irq().
+ */
+static void dummy_timer (unsigned long _dum)
+{
+	struct dummy		*dum = (struct dummy *) _dum;
+	struct urbp		*urbp, *tmp;
+	unsigned long		flags;
+	int			limit, total;
+	int			i;
+
+	/* simplistic model for one frame's bandwidth */
+	switch (dum->gadget.speed) {
+	case USB_SPEED_LOW:
+		total = 8/*bytes*/ * 12/*packets*/;
+		break;
+	case USB_SPEED_FULL:
+		total = 64/*bytes*/ * 19/*packets*/;
+		break;
+	case USB_SPEED_HIGH:
+		total = 512/*bytes*/ * 13/*packets*/ * 8/*uframes*/;
+		break;
+	default:
+		dev_err (dummy_dev(dum), "bogus device speed\n");
+		return;
+	}
+
+	/* FIXME if HZ != 1000 this will probably misbehave ... */
+
+	/* look at each urb queued by the host side driver */
+	spin_lock_irqsave (&dum->lock, flags);
+
+	if (!dum->udev) {
+		dev_err (dummy_dev(dum),
+				"timer fired with no URBs pending?\n");
+		spin_unlock_irqrestore (&dum->lock, flags);
+		return;
+	}
+
+	for (i = 0; i < DUMMY_ENDPOINTS; i++) {
+		if (!ep_name [i])
+			break;
+		dum->ep [i].already_seen = 0;
+	}
+
+restart:
+	list_for_each_entry_safe (urbp, tmp, &dum->urbp_list, urbp_list) {
+		struct urb		*urb;
+		struct dummy_request	*req;
+		u8			address;
+		struct dummy_ep		*ep = NULL;
+		int			type;
+
+		urb = urbp->urb;
+		if (urb->status != -EINPROGRESS) {
+			/* likely it was just unlinked */
+			goto return_urb;
+		}
+		type = usb_pipetype (urb->pipe);
+
+		/* used up this frame's non-periodic bandwidth?
+		 * FIXME there's infinite bandwidth for control and
+		 * periodic transfers ... unrealistic.
+		 */
+		if (total <= 0 && type == PIPE_BULK)
+			continue;
+
+		/* find the gadget's ep for this request (if configured) */
+		address = usb_pipeendpoint (urb->pipe);
+		if (usb_pipein (urb->pipe))
+			address |= USB_DIR_IN;
+		ep = find_endpoint(dum, address);
+		if (!ep) {
+			/* set_configuration() disagreement */
+			dev_dbg (dummy_dev(dum),
+				"no ep configured for urb %p\n",
+				urb);
+			maybe_set_status (urb, -EPROTO);
+			goto return_urb;
+		}
+
+		if (ep->already_seen)
+			continue;
+		ep->already_seen = 1;
+		if (ep == &dum->ep [0] && urb->error_count) {
+			ep->setup_stage = 1;	/* a new urb */
+			urb->error_count = 0;
+		}
+		if (ep->halted && !ep->setup_stage) {
+			/* NOTE: must not be iso! */
+			dev_dbg (dummy_dev(dum), "ep %s halted, urb %p\n",
+					ep->ep.name, urb);
+			maybe_set_status (urb, -EPIPE);
+			goto return_urb;
+		}
+		/* FIXME make sure both ends agree on maxpacket */
+
+		/* handle control requests */
+		if (ep == &dum->ep [0] && ep->setup_stage) {
+			struct usb_ctrlrequest		setup;
+			int				value = 1;
+			struct dummy_ep			*ep2;
+
+			setup = *(struct usb_ctrlrequest*) urb->setup_packet;
+			le16_to_cpus (&setup.wIndex);
+			le16_to_cpus (&setup.wValue);
+			le16_to_cpus (&setup.wLength);
+			if (setup.wLength != urb->transfer_buffer_length) {
+				maybe_set_status (urb, -EOVERFLOW);
+				goto return_urb;
+			}
+
+			/* paranoia, in case of stale queued data */
+			list_for_each_entry (req, &ep->queue, queue) {
+				list_del_init (&req->queue);
+				req->req.status = -EOVERFLOW;
+				dev_dbg (dummy_dev(dum), "stale req = %p\n",
+						req);
+
+				spin_unlock (&dum->lock);
+				req->req.complete (&ep->ep, &req->req);
+				spin_lock (&dum->lock);
+				ep->already_seen = 0;
+				goto restart;
+			}
+
+			/* gadget driver never sees set_address or operations
+			 * on standard feature flags.  some hardware doesn't
+			 * even expose them.
+			 */
+			ep->last_io = jiffies;
+			ep->setup_stage = 0;
+			ep->halted = 0;
+			switch (setup.bRequest) {
+			case USB_REQ_SET_ADDRESS:
+				if (setup.bRequestType != Dev_Request)
+					break;
+				dum->address = setup.wValue;
+				maybe_set_status (urb, 0);
+				dev_dbg (dummy_dev(dum), "set_address = %d\n",
+						setup.wValue);
+				value = 0;
+				break;
+			case USB_REQ_SET_FEATURE:
+				if (setup.bRequestType == Dev_Request) {
+					value = 0;
+					switch (setup.wValue) {
+					case USB_DEVICE_REMOTE_WAKEUP:
+						break;
+					default:
+						value = -EOPNOTSUPP;
+					}
+					if (value == 0) {
+						dum->devstatus |=
+							(1 << setup.wValue);
+						maybe_set_status (urb, 0);
+					}
+
+				} else if (setup.bRequestType == Ep_Request) {
+					// endpoint halt
+					ep2 = find_endpoint (dum,
+							setup.wIndex);
+					if (!ep2) {
+						value = -EOPNOTSUPP;
+						break;
+					}
+					ep2->halted = 1;
+					value = 0;
+					maybe_set_status (urb, 0);
+				}
+				break;
+			case USB_REQ_CLEAR_FEATURE:
+				if (setup.bRequestType == Dev_Request) {
+					switch (setup.wValue) {
+					case USB_DEVICE_REMOTE_WAKEUP:
+						dum->devstatus &= ~(1 <<
+							USB_DEVICE_REMOTE_WAKEUP);
+						value = 0;
+						maybe_set_status (urb, 0);
+						break;
+					default:
+						value = -EOPNOTSUPP;
+						break;
+					}
+				} else if (setup.bRequestType == Ep_Request) {
+					// endpoint halt
+					ep2 = find_endpoint (dum,
+							setup.wIndex);
+					if (!ep2) {
+						value = -EOPNOTSUPP;
+						break;
+					}
+					ep2->halted = 0;
+					value = 0;
+					maybe_set_status (urb, 0);
+				}
+				break;
+			case USB_REQ_GET_STATUS:
+				if (setup.bRequestType == Dev_InRequest
+						|| setup.bRequestType
+							== Intf_InRequest
+						|| setup.bRequestType
+							== Ep_InRequest
+						) {
+					char *buf;
+
+					// device: remote wakeup, selfpowered
+					// interface: nothing
+					// endpoint: halt
+					buf = (char *)urb->transfer_buffer;
+					if (urb->transfer_buffer_length > 0) {
+						if (setup.bRequestType ==
+								Ep_InRequest) {
+	ep2 = find_endpoint (dum, setup.wIndex);
+	if (!ep2) {
+		value = -EOPNOTSUPP;
+		break;
+	}
+	buf [0] = ep2->halted;
+						} else if (setup.bRequestType ==
+								Dev_InRequest) {
+							buf [0] = (u8)
+								dum->devstatus;
+						} else
+							buf [0] = 0;
+					}
+					if (urb->transfer_buffer_length > 1)
+						buf [1] = 0;
+					urb->actual_length = min (2,
+						urb->transfer_buffer_length);
+					value = 0;
+					maybe_set_status (urb, 0);
+				}
+				break;
+			}
+
+			/* gadget driver handles all other requests.  block
+			 * until setup() returns; no reentrancy issues etc.
+			 */
+			if (value > 0) {
+				spin_unlock (&dum->lock);
+				value = dum->driver->setup (&dum->gadget,
+						&setup);
+				spin_lock (&dum->lock);
+
+				if (value >= 0) {
+					/* no delays (max 64KB data stage) */
+					limit = 64*1024;
+					goto treat_control_like_bulk;
+				}
+				/* error, see below */
+			}
+
+			if (value < 0) {
+				if (value != -EOPNOTSUPP)
+					dev_dbg (dummy_dev(dum),
+						"setup --> %d\n",
+						value);
+				maybe_set_status (urb, -EPIPE);
+				urb->actual_length = 0;
+			}
+
+			goto return_urb;
+		}
+
+		/* non-control requests */
+		limit = total;
+		switch (usb_pipetype (urb->pipe)) {
+		case PIPE_ISOCHRONOUS:
+			/* FIXME is it urb->interval since the last xfer?
+			 * use urb->iso_frame_desc[i].
+			 * complete whether or not ep has requests queued.
+			 * report random errors, to debug drivers.
+			 */
+			limit = max (limit, periodic_bytes (dum, ep));
+			maybe_set_status (urb, -ENOSYS);
+			break;
+
+		case PIPE_INTERRUPT:
+			/* FIXME is it urb->interval since the last xfer?
+			 * this almost certainly polls too fast.
+			 */
+			limit = max (limit, periodic_bytes (dum, ep));
+			/* FALLTHROUGH */
+
+		// case PIPE_BULK:  case PIPE_CONTROL:
+		default:
+		treat_control_like_bulk:
+			ep->last_io = jiffies;
+			total = transfer (dum, urb, ep, limit);
+			break;
+		}
+
+		/* incomplete transfer? */
+		if (urb->status == -EINPROGRESS)
+			continue;
+
+return_urb:
+		urb->hcpriv = NULL;
+		list_del (&urbp->urbp_list);
+		kfree (urbp);
+		if (ep)
+			ep->already_seen = ep->setup_stage = 0;
+
+		spin_unlock (&dum->lock);
+		usb_hcd_giveback_urb (dummy_to_hcd(dum), urb, NULL);
+		spin_lock (&dum->lock);
+
+		goto restart;
+	}
+
+	/* want a 1 msec delay here */
+	if (!list_empty (&dum->urbp_list))
+		mod_timer (&dum->timer, jiffies + msecs_to_jiffies(1));
+	else {
+		usb_put_dev (dum->udev);
+		dum->udev = NULL;
+	}
+
+	spin_unlock_irqrestore (&dum->lock, flags);
+}
+
+/*-------------------------------------------------------------------------*/
+
+#define PORT_C_MASK \
+	 ((1 << USB_PORT_FEAT_C_CONNECTION) \
+	| (1 << USB_PORT_FEAT_C_ENABLE) \
+	| (1 << USB_PORT_FEAT_C_SUSPEND) \
+	| (1 << USB_PORT_FEAT_C_OVER_CURRENT) \
+	| (1 << USB_PORT_FEAT_C_RESET))
+
+static int dummy_hub_status (struct usb_hcd *hcd, char *buf)
+{
+	struct dummy		*dum;
+	unsigned long		flags;
+	int			retval;
+
+	dum = hcd_to_dummy (hcd);
+
+	spin_lock_irqsave (&dum->lock, flags);
+	if (!(dum->port_status & PORT_C_MASK))
+		retval = 0;
+	else {
+		*buf = (1 << 1);
+		dev_dbg (dummy_dev(dum), "port status 0x%08x has changes\n",
+			dum->port_status);
+		retval = 1;
+	}
+	spin_unlock_irqrestore (&dum->lock, flags);
+	return retval;
+}
+
+static inline void
+hub_descriptor (struct usb_hub_descriptor *desc)
+{
+	memset (desc, 0, sizeof *desc);
+	desc->bDescriptorType = 0x29;
+	desc->bDescLength = 9;
+	desc->wHubCharacteristics = __constant_cpu_to_le16 (0x0001);
+	desc->bNbrPorts = 1;
+	desc->bitmap [0] = 0xff;
+	desc->bitmap [1] = 0xff;
+}
+
+static int dummy_hub_control (
+	struct usb_hcd	*hcd,
+	u16		typeReq,
+	u16		wValue,
+	u16		wIndex,
+	char		*buf,
+	u16		wLength
+) {
+	struct dummy	*dum;
+	int		retval = 0;
+	unsigned long	flags;
+
+	dum = hcd_to_dummy (hcd);
+	spin_lock_irqsave (&dum->lock, flags);
+	switch (typeReq) {
+	case ClearHubFeature:
+		break;
+	case ClearPortFeature:
+		switch (wValue) {
+		case USB_PORT_FEAT_SUSPEND:
+			if (dum->port_status & (1 << USB_PORT_FEAT_SUSPEND)) {
+				/* 20msec resume signaling */
+				dum->resuming = 1;
+				dum->re_timeout = jiffies +
+							msecs_to_jiffies(20);
+			}
+			break;
+		case USB_PORT_FEAT_POWER:
+			dum->port_status = 0;
+			dum->resuming = 0;
+			stop_activity(dum, dum->driver);
+			break;
+		default:
+			dum->port_status &= ~(1 << wValue);
+		}
+		break;
+	case GetHubDescriptor:
+		hub_descriptor ((struct usb_hub_descriptor *) buf);
+		break;
+	case GetHubStatus:
+		*(u32 *) buf = __constant_cpu_to_le32 (0);
+		break;
+	case GetPortStatus:
+		if (wIndex != 1)
+			retval = -EPIPE;
+
+		/* whoever resets or resumes must GetPortStatus to
+		 * complete it!!
+		 */
+		if (dum->resuming && time_after (jiffies, dum->re_timeout)) {
+			dum->port_status |= (1 << USB_PORT_FEAT_C_SUSPEND);
+			dum->port_status &= ~(1 << USB_PORT_FEAT_SUSPEND);
+			dum->resuming = 0;
+			dum->re_timeout = 0;
+			if (dum->driver && dum->driver->resume) {
+				spin_unlock (&dum->lock);
+				dum->driver->resume (&dum->gadget);
+				spin_lock (&dum->lock);
+			}
+		}
+		if ((dum->port_status & (1 << USB_PORT_FEAT_RESET)) != 0
+				&& time_after (jiffies, dum->re_timeout)) {
+			dum->port_status |= (1 << USB_PORT_FEAT_C_RESET);
+			dum->port_status &= ~(1 << USB_PORT_FEAT_RESET);
+			dum->re_timeout = 0;
+			if (dum->driver) {
+				dum->port_status |= USB_PORT_STAT_ENABLE;
+				/* give it the best speed we agree on */
+				dum->gadget.speed = dum->driver->speed;
+				dum->gadget.ep0->maxpacket = 64;
+				switch (dum->gadget.speed) {
+				case USB_SPEED_HIGH:
+					dum->port_status |=
+						USB_PORT_STAT_HIGH_SPEED;
+					break;
+				case USB_SPEED_LOW:
+					dum->gadget.ep0->maxpacket = 8;
+					dum->port_status |=
+						USB_PORT_STAT_LOW_SPEED;
+					break;
+				default:
+					dum->gadget.speed = USB_SPEED_FULL;
+					break;
+				}
+			}
+		}
+		((u16 *) buf)[0] = cpu_to_le16 (dum->port_status);
+		((u16 *) buf)[1] = cpu_to_le16 (dum->port_status >> 16);
+		break;
+	case SetHubFeature:
+		retval = -EPIPE;
+		break;
+	case SetPortFeature:
+		switch (wValue) {
+		case USB_PORT_FEAT_SUSPEND:
+			if ((dum->port_status & (1 << USB_PORT_FEAT_SUSPEND))
+					== 0) {
+				dum->port_status |=
+						(1 << USB_PORT_FEAT_SUSPEND);
+				if (dum->driver && dum->driver->suspend) {
+					spin_unlock (&dum->lock);
+					dum->driver->suspend (&dum->gadget);
+					spin_lock (&dum->lock);
+				}
+			}
+			break;
+		case USB_PORT_FEAT_RESET:
+			/* if it's already running, disconnect first */
+			if (dum->port_status & USB_PORT_STAT_ENABLE) {
+				dum->port_status &= ~(USB_PORT_STAT_ENABLE
+						| USB_PORT_STAT_LOW_SPEED
+						| USB_PORT_STAT_HIGH_SPEED);
+				if (dum->driver) {
+					dev_dbg (dummy_dev(dum),
+							"disconnect\n");
+					stop_activity (dum, dum->driver);
+				}
+
+				/* FIXME test that code path! */
+			}
+			/* 50msec reset signaling */
+			dum->re_timeout = jiffies + msecs_to_jiffies(50);
+			/* FALLTHROUGH */
+		default:
+			dum->port_status |= (1 << wValue);
+		}
+		break;
+
+	default:
+		dev_dbg (dummy_dev(dum),
+			"hub control req%04x v%04x i%04x l%d\n",
+			typeReq, wValue, wIndex, wLength);
+
+		/* "protocol stall" on error */
+		retval = -EPIPE;
+	}
+	spin_unlock_irqrestore (&dum->lock, flags);
+	return retval;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+static inline ssize_t
+show_urb (char *buf, size_t size, struct urb *urb)
+{
+	int ep = usb_pipeendpoint (urb->pipe);
+
+	return snprintf (buf, size,
+		"urb/%p %s ep%d%s%s len %d/%d\n",
+		urb,
+		({ char *s;
+		 switch (urb->dev->speed) {
+		 case USB_SPEED_LOW:	s = "ls"; break;
+		 case USB_SPEED_FULL:	s = "fs"; break;
+		 case USB_SPEED_HIGH:	s = "hs"; break;
+		 default:		s = "?"; break;
+		 }; s; }),
+		ep, ep ? (usb_pipein (urb->pipe) ? "in" : "out") : "",
+		({ char *s; \
+		 switch (usb_pipetype (urb->pipe)) { \
+		 case PIPE_CONTROL:	s = ""; break; \
+		 case PIPE_BULK:	s = "-bulk"; break; \
+		 case PIPE_INTERRUPT:	s = "-int"; break; \
+		 default: 		s = "-iso"; break; \
+		}; s;}),
+		urb->actual_length, urb->transfer_buffer_length);
+}
+
+static ssize_t
+show_urbs (struct device *dev, char *buf)
+{
+	struct usb_hcd		*hcd = dev_get_drvdata (dev);
+	struct dummy		*dum = hcd_to_dummy (hcd);
+	struct urbp		*urbp;
+	size_t			size = 0;
+	unsigned long		flags;
+
+	spin_lock_irqsave (&dum->lock, flags);
+	list_for_each_entry (urbp, &dum->urbp_list, urbp_list) {
+		size_t		temp;
+
+		temp = show_urb (buf, PAGE_SIZE - size, urbp->urb);
+		buf += temp;
+		size += temp;
+	}
+	spin_unlock_irqrestore (&dum->lock, flags);
+
+	return size;
+}
+static DEVICE_ATTR (urbs, S_IRUGO, show_urbs, NULL);
+
+static int dummy_start (struct usb_hcd *hcd)
+{
+	struct dummy		*dum;
+	struct usb_device	*root;
+	int			retval;
+
+	dum = hcd_to_dummy (hcd);
+
+	/*
+	 * MASTER side init ... we emulate a root hub that'll only ever
+	 * talk to one device (the slave side).  Also appears in sysfs,
+	 * just like more familiar pci-based HCDs.
+	 */
+	spin_lock_init (&dum->lock);
+	init_timer (&dum->timer);
+	dum->timer.function = dummy_timer;
+	dum->timer.data = (unsigned long) dum;
+
+	INIT_LIST_HEAD (&dum->urbp_list);
+
+	root = usb_alloc_dev (NULL, &hcd->self, 0);
+	if (!root)
+		return -ENOMEM;
+
+	/* root hub enters addressed state... */
+	hcd->state = HC_STATE_RUNNING;
+	root->speed = USB_SPEED_HIGH;
+
+	/* ...then configured, so khubd sees us. */
+	if ((retval = usb_hcd_register_root_hub (root, hcd)) != 0) {
+		goto err1;
+	}
+
+	/* only show a low-power port: just 8mA */
+	hub_set_power_budget (root, 8);
+
+	if ((retval = dummy_register_udc (dum)) != 0)
+		goto err2;
+
+	/* FIXME 'urbs' should be a per-device thing, maybe in usbcore */
+	device_create_file (dummy_dev(dum), &dev_attr_urbs);
+	return 0;
+
+ err2:
+	usb_disconnect (&hcd->self.root_hub);
+ err1:
+	usb_put_dev (root);
+	hcd->state = HC_STATE_QUIESCING;
+	return retval;
+}
+
+static void dummy_stop (struct usb_hcd *hcd)
+{
+	struct dummy		*dum;
+
+	dum = hcd_to_dummy (hcd);
+
+	device_remove_file (dummy_dev(dum), &dev_attr_urbs);
+
+	usb_gadget_unregister_driver (dum->driver);
+	dummy_unregister_udc (dum);
+
+	dev_info (dummy_dev(dum), "stopped\n");
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int dummy_h_get_frame (struct usb_hcd *hcd)
+{
+	return dummy_g_get_frame (NULL);
+}
+
+static const struct hc_driver dummy_hcd = {
+	.description =		(char *) driver_name,
+	.product_desc =		"Dummy host controller",
+	.hcd_priv_size =	sizeof(struct dummy),
+
+	.flags =		HCD_USB2,
+
+	.start =		dummy_start,
+	.stop =			dummy_stop,
+
+	.urb_enqueue = 		dummy_urb_enqueue,
+	.urb_dequeue = 		dummy_urb_dequeue,
+
+	.get_frame_number = 	dummy_h_get_frame,
+
+	.hub_status_data = 	dummy_hub_status,
+	.hub_control = 		dummy_hub_control,
+};
+
+static int dummy_probe (struct device *dev)
+{
+	struct usb_hcd		*hcd;
+	int			retval;
+
+	dev_info (dev, "%s, driver " DRIVER_VERSION "\n", driver_desc);
+
+	hcd = usb_create_hcd (&dummy_hcd, dev, dev->bus_id);
+	if (!hcd)
+		return -ENOMEM;
+	the_controller = hcd_to_dummy (hcd);
+
+	retval = usb_add_hcd(hcd, 0, 0);
+	if (retval != 0) {
+		usb_put_hcd (hcd);
+		the_controller = NULL;
+	}
+	return retval;
+}
+
+static void dummy_remove (struct device *dev)
+{
+	struct usb_hcd		*hcd;
+
+	hcd = dev_get_drvdata (dev);
+	usb_remove_hcd (hcd);
+	usb_put_hcd (hcd);
+	the_controller = NULL;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int dummy_pdev_detect (void)
+{
+	int			retval;
+
+	retval = driver_register (&dummy_driver);
+	if (retval < 0)
+		return retval;
+
+	the_pdev.name = "hc";
+	the_pdev.dev.driver = &dummy_driver;
+	the_pdev.dev.release = dummy_pdev_release;
+
+	retval = platform_device_register (&the_pdev);
+	if (retval < 0)
+		driver_unregister (&dummy_driver);
+	return retval;
+}
+
+static void dummy_pdev_remove (void)
+{
+	platform_device_unregister (&the_pdev);
+	driver_unregister (&dummy_driver);
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int __init init (void)
+{
+	int	retval;
+
+	if (usb_disabled ())
+		return -ENODEV;
+	if ((retval = dummy_pdev_detect ()) != 0)
+		return retval;
+	if ((retval = dummy_probe (&the_pdev.dev)) != 0)
+		dummy_pdev_remove ();
+	return retval;
+}
+module_init (init);
+
+static void __exit cleanup (void)
+{
+	dummy_remove (&the_pdev.dev);
+	dummy_pdev_remove ();
+}
+module_exit (cleanup);