Linux-2.6.12-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, 2140 insertions, 0 deletions

diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
new file mode 100644
index 000000000000..3104f28f6aa8
--- /dev/null
+++ b/drivers/usb/misc/usbtest.c
@@ -0,0 +1,2140 @@
+#include <linux/config.h>
+#if !defined (DEBUG) && defined (CONFIG_USB_DEBUG)
+#   define DEBUG
+#endif
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <asm/scatterlist.h>
+
+#include <linux/usb.h>
+
+
+/*-------------------------------------------------------------------------*/
+
+// FIXME make these public somewhere; usbdevfs.h?
+//
+struct usbtest_param {
+	// inputs
+	unsigned		test_num;	/* 0..(TEST_CASES-1) */
+	unsigned		iterations;
+	unsigned		length;
+	unsigned		vary;
+	unsigned		sglen;
+
+	// outputs
+	struct timeval		duration;
+};
+#define USBTEST_REQUEST	_IOWR('U', 100, struct usbtest_param)
+
+/*-------------------------------------------------------------------------*/
+
+#define	GENERIC		/* let probe() bind using module params */
+
+/* Some devices that can be used for testing will have "real" drivers.
+ * Entries for those need to be enabled here by hand, after disabling
+ * that "real" driver.
+ */
+//#define	IBOT2		/* grab iBOT2 webcams */
+//#define	KEYSPAN_19Qi	/* grab un-renumerated serial adapter */
+
+/*-------------------------------------------------------------------------*/
+
+struct usbtest_info {
+	const char		*name;
+	u8			ep_in;		/* bulk/intr source */
+	u8			ep_out;		/* bulk/intr sink */
+	unsigned		autoconf : 1;
+	unsigned		ctrl_out : 1;
+	unsigned		iso : 1;	/* try iso in/out */
+	int			alt;
+};
+
+/* this is accessed only through usbfs ioctl calls.
+ * one ioctl to issue a test ... one lock per device.
+ * tests create other threads if they need them.
+ * urbs and buffers are allocated dynamically,
+ * and data generated deterministically.
+ */
+struct usbtest_dev {
+	struct usb_interface	*intf;
+	struct usbtest_info	*info;
+	int			in_pipe;
+	int			out_pipe;
+	int			in_iso_pipe;
+	int			out_iso_pipe;
+	struct usb_endpoint_descriptor	*iso_in, *iso_out;
+	struct semaphore	sem;
+
+#define TBUF_SIZE	256
+	u8			*buf;
+};
+
+static struct usb_device *testdev_to_usbdev (struct usbtest_dev *test)
+{
+	return interface_to_usbdev (test->intf);
+}
+
+/* set up all urbs so they can be used with either bulk or interrupt */
+#define	INTERRUPT_RATE		1	/* msec/transfer */
+
+#define xprintk(tdev,level,fmt,args...) \
+	dev_printk(level ,  &(tdev)->intf->dev ,  fmt ,  ## args)
+
+#ifdef DEBUG
+#define DBG(dev,fmt,args...) \
+	xprintk(dev , KERN_DEBUG , fmt , ## args)
+#else
+#define DBG(dev,fmt,args...) \
+	do { } while (0)
+#endif /* DEBUG */
+
+#ifdef VERBOSE
+#define VDBG DBG
+#else
+#define VDBG(dev,fmt,args...) \
+	do { } while (0)
+#endif	/* VERBOSE */
+
+#define ERROR(dev,fmt,args...) \
+	xprintk(dev , KERN_ERR , fmt , ## args)
+#define WARN(dev,fmt,args...) \
+	xprintk(dev , KERN_WARNING , fmt , ## args)
+#define INFO(dev,fmt,args...) \
+	xprintk(dev , KERN_INFO , fmt , ## args)
+
+/*-------------------------------------------------------------------------*/
+
+static int
+get_endpoints (struct usbtest_dev *dev, struct usb_interface *intf)
+{
+	int				tmp;
+	struct usb_host_interface	*alt;
+	struct usb_host_endpoint	*in, *out;
+	struct usb_host_endpoint	*iso_in, *iso_out;
+	struct usb_device		*udev;
+
+	for (tmp = 0; tmp < intf->num_altsetting; tmp++) {
+		unsigned	ep;
+
+		in = out = NULL;
+		iso_in = iso_out = NULL;
+		alt = intf->altsetting + tmp;
+
+		/* take the first altsetting with in-bulk + out-bulk;
+		 * ignore other endpoints and altsetttings.
+		 */
+		for (ep = 0; ep < alt->desc.bNumEndpoints; ep++) {
+			struct usb_host_endpoint	*e;
+
+			e = alt->endpoint + ep;
+			switch (e->desc.bmAttributes) {
+			case USB_ENDPOINT_XFER_BULK:
+				break;
+			case USB_ENDPOINT_XFER_ISOC:
+				if (dev->info->iso)
+					goto try_iso;
+				// FALLTHROUGH
+			default:
+				continue;
+			}
+			if (e->desc.bEndpointAddress & USB_DIR_IN) {
+				if (!in)
+					in = e;
+			} else {
+				if (!out)
+					out = e;
+			}
+			continue;
+try_iso:
+			if (e->desc.bEndpointAddress & USB_DIR_IN) {
+				if (!iso_in)
+					iso_in = e;
+			} else {
+				if (!iso_out)
+					iso_out = e;
+			}
+		}
+		if ((in && out)  ||  (iso_in && iso_out))
+			goto found;
+	}
+	return -EINVAL;
+
+found:
+	udev = testdev_to_usbdev (dev);
+	if (alt->desc.bAlternateSetting != 0) {
+		tmp = usb_set_interface (udev,
+				alt->desc.bInterfaceNumber,
+				alt->desc.bAlternateSetting);
+		if (tmp < 0)
+			return tmp;
+	}
+
+	if (in) {
+		dev->in_pipe = usb_rcvbulkpipe (udev,
+			in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
+		dev->out_pipe = usb_sndbulkpipe (udev,
+			out->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
+	}
+	if (iso_in) {
+		dev->iso_in = &iso_in->desc;
+		dev->in_iso_pipe = usb_rcvisocpipe (udev,
+				iso_in->desc.bEndpointAddress
+					& USB_ENDPOINT_NUMBER_MASK);
+		dev->iso_out = &iso_out->desc;
+		dev->out_iso_pipe = usb_sndisocpipe (udev,
+				iso_out->desc.bEndpointAddress
+					& USB_ENDPOINT_NUMBER_MASK);
+	}
+	return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* Support for testing basic non-queued I/O streams.
+ *
+ * These just package urbs as requests that can be easily canceled.
+ * Each urb's data buffer is dynamically allocated; callers can fill
+ * them with non-zero test data (or test for it) when appropriate.
+ */
+
+static void simple_callback (struct urb *urb, struct pt_regs *regs)
+{
+	complete ((struct completion *) urb->context);
+}
+
+static struct urb *simple_alloc_urb (
+	struct usb_device	*udev,
+	int			pipe,
+	unsigned long		bytes
+)
+{
+	struct urb		*urb;
+
+	if (bytes < 0)
+		return NULL;
+	urb = usb_alloc_urb (0, SLAB_KERNEL);
+	if (!urb)
+		return urb;
+	usb_fill_bulk_urb (urb, udev, pipe, NULL, bytes, simple_callback, NULL);
+	urb->interval = (udev->speed == USB_SPEED_HIGH)
+			? (INTERRUPT_RATE << 3)
+			: INTERRUPT_RATE;
+	urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
+	if (usb_pipein (pipe))
+		urb->transfer_flags |= URB_SHORT_NOT_OK;
+	urb->transfer_buffer = usb_buffer_alloc (udev, bytes, SLAB_KERNEL,
+			&urb->transfer_dma);
+	if (!urb->transfer_buffer) {
+		usb_free_urb (urb);
+		urb = NULL;
+	} else
+		memset (urb->transfer_buffer, 0, bytes);
+	return urb;
+}
+
+static unsigned pattern = 0;
+module_param (pattern, uint, S_IRUGO);
+// MODULE_PARM_DESC (pattern, "i/o pattern (0 == zeroes)");
+
+static inline void simple_fill_buf (struct urb *urb)
+{
+	unsigned	i;
+	u8		*buf = urb->transfer_buffer;
+	unsigned	len = urb->transfer_buffer_length;
+
+	switch (pattern) {
+	default:
+		// FALLTHROUGH
+	case 0:
+		memset (buf, 0, len);
+		break;
+	case 1:			/* mod63 */
+		for (i = 0; i < len; i++)
+			*buf++ = (u8) (i % 63);
+		break;
+	}
+}
+
+static inline int simple_check_buf (struct urb *urb)
+{
+	unsigned	i;
+	u8		expected;
+	u8		*buf = urb->transfer_buffer;
+	unsigned	len = urb->actual_length;
+
+	for (i = 0; i < len; i++, buf++) {
+		switch (pattern) {
+		/* all-zeroes has no synchronization issues */
+		case 0:
+			expected = 0;
+			break;
+		/* mod63 stays in sync with short-terminated transfers,
+		 * or otherwise when host and gadget agree on how large
+		 * each usb transfer request should be.  resync is done
+		 * with set_interface or set_config.
+		 */
+		case 1:			/* mod63 */
+			expected = i % 63;
+			break;
+		/* always fail unsupported patterns */
+		default:
+			expected = !*buf;
+			break;
+		}
+		if (*buf == expected)
+			continue;
+		dbg ("buf[%d] = %d (not %d)", i, *buf, expected);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static void simple_free_urb (struct urb *urb)
+{
+	usb_buffer_free (urb->dev, urb->transfer_buffer_length,
+			urb->transfer_buffer, urb->transfer_dma);
+	usb_free_urb (urb);
+}
+
+static int simple_io (
+	struct urb		*urb,
+	int			iterations,
+	int			vary,
+	int			expected,
+	const char		*label
+)
+{
+	struct usb_device	*udev = urb->dev;
+	int			max = urb->transfer_buffer_length;
+	struct completion	completion;
+	int			retval = 0;
+
+	urb->context = &completion;
+	while (retval == 0 && iterations-- > 0) {
+		init_completion (&completion);
+		if (usb_pipeout (urb->pipe))
+			simple_fill_buf (urb);
+		if ((retval = usb_submit_urb (urb, SLAB_KERNEL)) != 0)
+			break;
+
+		/* NOTE:  no timeouts; can't be broken out of by interrupt */
+		wait_for_completion (&completion);
+		retval = urb->status;
+		urb->dev = udev;
+		if (retval == 0 && usb_pipein (urb->pipe))
+			retval = simple_check_buf (urb);
+
+		if (vary) {
+			int	len = urb->transfer_buffer_length;
+
+			len += vary;
+			len %= max;
+			if (len == 0)
+				len = (vary < max) ? vary : max;
+			urb->transfer_buffer_length = len;
+		}
+
+		/* FIXME if endpoint halted, clear halt (and log) */
+	}
+	urb->transfer_buffer_length = max;
+
+	if (expected != retval)
+		dev_dbg (&udev->dev,
+			"%s failed, iterations left %d, status %d (not %d)\n",
+				label, iterations, retval, expected);
+	return retval;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* We use scatterlist primitives to test queued I/O.
+ * Yes, this also tests the scatterlist primitives.
+ */
+
+static void free_sglist (struct scatterlist *sg, int nents)
+{
+	unsigned		i;
+	
+	if (!sg)
+		return;
+	for (i = 0; i < nents; i++) {
+		if (!sg [i].page)
+			continue;
+		kfree (page_address (sg [i].page) + sg [i].offset);
+	}
+	kfree (sg);
+}
+
+static struct scatterlist *
+alloc_sglist (int nents, int max, int vary)
+{
+	struct scatterlist	*sg;
+	unsigned		i;
+	unsigned		size = max;
+
+	sg = kmalloc (nents * sizeof *sg, SLAB_KERNEL);
+	if (!sg)
+		return NULL;
+	memset (sg, 0, nents * sizeof *sg);
+
+	for (i = 0; i < nents; i++) {
+		char		*buf;
+
+		buf = kmalloc (size, SLAB_KERNEL);
+		if (!buf) {
+			free_sglist (sg, i);
+			return NULL;
+		}
+		memset (buf, 0, size);
+
+		/* kmalloc pages are always physically contiguous! */
+		sg [i].page = virt_to_page (buf);
+		sg [i].offset = offset_in_page (buf);
+		sg [i].length = size;
+
+		if (vary) {
+			size += vary;
+			size %= max;
+			if (size == 0)
+				size = (vary < max) ? vary : max;
+		}
+	}
+
+	return sg;
+}
+
+static int perform_sglist (
+	struct usb_device	*udev,
+	unsigned		iterations,
+	int			pipe,
+	struct usb_sg_request	*req,
+	struct scatterlist	*sg,
+	int			nents
+)
+{
+	int			retval = 0;
+
+	while (retval == 0 && iterations-- > 0) {
+		retval = usb_sg_init (req, udev, pipe,
+				(udev->speed == USB_SPEED_HIGH)
+					? (INTERRUPT_RATE << 3)
+					: INTERRUPT_RATE,
+				sg, nents, 0, SLAB_KERNEL);
+		
+		if (retval)
+			break;
+		usb_sg_wait (req);
+		retval = req->status;
+
+		/* FIXME if endpoint halted, clear halt (and log) */
+	}
+
+	// FIXME for unlink or fault handling tests, don't report
+	// failure if retval is as we expected ...
+
+	if (retval)
+		dbg ("perform_sglist failed, iterations left %d, status %d",
+				iterations, retval);
+	return retval;
+}
+
+
+/*-------------------------------------------------------------------------*/
+
+/* unqueued control message testing
+ *
+ * there's a nice set of device functional requirements in chapter 9 of the
+ * usb 2.0 spec, which we can apply to ANY device, even ones that don't use
+ * special test firmware.
+ *
+ * we know the device is configured (or suspended) by the time it's visible
+ * through usbfs.  we can't change that, so we won't test enumeration (which
+ * worked 'well enough' to get here, this time), power management (ditto),
+ * or remote wakeup (which needs human interaction).
+ */
+
+static unsigned realworld = 1;
+module_param (realworld, uint, 0);
+MODULE_PARM_DESC (realworld, "clear to demand stricter ch9 compliance");
+
+static int get_altsetting (struct usbtest_dev *dev)
+{
+	struct usb_interface	*iface = dev->intf;
+	struct usb_device	*udev = interface_to_usbdev (iface);
+	int			retval;
+
+	retval = usb_control_msg (udev, usb_rcvctrlpipe (udev, 0),
+			USB_REQ_GET_INTERFACE, USB_DIR_IN|USB_RECIP_INTERFACE,
+			0, iface->altsetting [0].desc.bInterfaceNumber,
+			dev->buf, 1, USB_CTRL_GET_TIMEOUT);
+	switch (retval) {
+	case 1:
+		return dev->buf [0];
+	case 0:
+		retval = -ERANGE;
+		// FALLTHROUGH
+	default:
+		return retval;
+	}
+}
+
+static int set_altsetting (struct usbtest_dev *dev, int alternate)
+{
+	struct usb_interface		*iface = dev->intf;
+	struct usb_device		*udev;
+
+	if (alternate < 0 || alternate >= 256)
+		return -EINVAL;
+
+	udev = interface_to_usbdev (iface);
+	return usb_set_interface (udev,
+			iface->altsetting [0].desc.bInterfaceNumber,
+			alternate);
+}
+
+static int is_good_config (char *buf, int len)
+{
+	struct usb_config_descriptor	*config;
+	
+	if (len < sizeof *config)
+		return 0;
+	config = (struct usb_config_descriptor *) buf;
+
+	switch (config->bDescriptorType) {
+	case USB_DT_CONFIG:
+	case USB_DT_OTHER_SPEED_CONFIG:
+		if (config->bLength != 9) {
+			dbg ("bogus config descriptor length");
+			return 0;
+		}
+		/* this bit 'must be 1' but often isn't */
+		if (!realworld && !(config->bmAttributes & 0x80)) {
+			dbg ("high bit of config attributes not set");
+			return 0;
+		}
+		if (config->bmAttributes & 0x1f) {	/* reserved == 0 */
+			dbg ("reserved config bits set");
+			return 0;
+		}
+		break;
+	default:
+		return 0;
+	}
+
+	if (le16_to_cpu(config->wTotalLength) == len)		/* read it all */
+		return 1;
+	if (le16_to_cpu(config->wTotalLength) >= TBUF_SIZE)		/* max partial read */
+		return 1;
+	dbg ("bogus config descriptor read size");
+	return 0;
+}
+
+/* sanity test for standard requests working with usb_control_mesg() and some
+ * of the utility functions which use it.
+ *
+ * this doesn't test how endpoint halts behave or data toggles get set, since
+ * we won't do I/O to bulk/interrupt endpoints here (which is how to change
+ * halt or toggle).  toggle testing is impractical without support from hcds.
+ *
+ * this avoids failing devices linux would normally work with, by not testing
+ * config/altsetting operations for devices that only support their defaults.
+ * such devices rarely support those needless operations.
+ *
+ * NOTE that since this is a sanity test, it's not examining boundary cases
+ * to see if usbcore, hcd, and device all behave right.  such testing would
+ * involve varied read sizes and other operation sequences.
+ */
+static int ch9_postconfig (struct usbtest_dev *dev)
+{
+	struct usb_interface	*iface = dev->intf;
+	struct usb_device	*udev = interface_to_usbdev (iface);
+	int			i, alt, retval;
+
+	/* [9.2.3] if there's more than one altsetting, we need to be able to
+	 * set and get each one.  mostly trusts the descriptors from usbcore.
+	 */
+	for (i = 0; i < iface->num_altsetting; i++) {
+
+		/* 9.2.3 constrains the range here */
+		alt = iface->altsetting [i].desc.bAlternateSetting;
+		if (alt < 0 || alt >= iface->num_altsetting) {
+			dev_dbg (&iface->dev,
+					"invalid alt [%d].bAltSetting = %d\n",
+					i, alt);
+		}
+
+		/* [real world] get/set unimplemented if there's only one */
+		if (realworld && iface->num_altsetting == 1)
+			continue;
+
+		/* [9.4.10] set_interface */
+		retval = set_altsetting (dev, alt);
+		if (retval) {
+			dev_dbg (&iface->dev, "can't set_interface = %d, %d\n",
+					alt, retval);
+			return retval;
+		}
+
+		/* [9.4.4] get_interface always works */
+		retval = get_altsetting (dev);
+		if (retval != alt) {
+			dev_dbg (&iface->dev, "get alt should be %d, was %d\n",
+					alt, retval);
+			return (retval < 0) ? retval : -EDOM;
+		}
+
+	}
+
+	/* [real world] get_config unimplemented if there's only one */
+	if (!realworld || udev->descriptor.bNumConfigurations != 1) {
+		int	expected = udev->actconfig->desc.bConfigurationValue;
+
+		/* [9.4.2] get_configuration always works
+		 * ... although some cheap devices (like one TI Hub I've got)
+		 * won't return config descriptors except before set_config.
+		 */
+		retval = usb_control_msg (udev, usb_rcvctrlpipe (udev, 0),
+				USB_REQ_GET_CONFIGURATION,
+				USB_DIR_IN | USB_RECIP_DEVICE,
+				0, 0, dev->buf, 1, USB_CTRL_GET_TIMEOUT);
+		if (retval != 1 || dev->buf [0] != expected) {
+			dev_dbg (&iface->dev,
+				"get config --> %d (%d)\n", retval,
+				expected);
+			return (retval < 0) ? retval : -EDOM;
+		}
+	}
+
+	/* there's always [9.4.3] a device descriptor [9.6.1] */
+	retval = usb_get_descriptor (udev, USB_DT_DEVICE, 0,
+			dev->buf, sizeof udev->descriptor);
+	if (retval != sizeof udev->descriptor) {
+		dev_dbg (&iface->dev, "dev descriptor --> %d\n", retval);
+		return (retval < 0) ? retval : -EDOM;
+	}
+
+	/* there's always [9.4.3] at least one config descriptor [9.6.3] */
+	for (i = 0; i < udev->descriptor.bNumConfigurations; i++) {
+		retval = usb_get_descriptor (udev, USB_DT_CONFIG, i,
+				dev->buf, TBUF_SIZE);
+		if (!is_good_config (dev->buf, retval)) {
+			dev_dbg (&iface->dev,
+					"config [%d] descriptor --> %d\n",
+					i, retval);
+			return (retval < 0) ? retval : -EDOM;
+		}
+
+		// FIXME cross-checking udev->config[i] to make sure usbcore
+		// parsed it right (etc) would be good testing paranoia
+	}
+
+	/* and sometimes [9.2.6.6] speed dependent descriptors */
+	if (le16_to_cpu(udev->descriptor.bcdUSB) == 0x0200) {
+		struct usb_qualifier_descriptor		*d = NULL;
+
+		/* device qualifier [9.6.2] */
+		retval = usb_get_descriptor (udev,
+				USB_DT_DEVICE_QUALIFIER, 0, dev->buf,
+				sizeof (struct usb_qualifier_descriptor));
+		if (retval == -EPIPE) {
+			if (udev->speed == USB_SPEED_HIGH) {
+				dev_dbg (&iface->dev,
+						"hs dev qualifier --> %d\n",
+						retval);
+				return (retval < 0) ? retval : -EDOM;
+			}
+			/* usb2.0 but not high-speed capable; fine */
+		} else if (retval != sizeof (struct usb_qualifier_descriptor)) {
+			dev_dbg (&iface->dev, "dev qualifier --> %d\n", retval);
+			return (retval < 0) ? retval : -EDOM;
+		} else
+			d = (struct usb_qualifier_descriptor *) dev->buf;
+
+		/* might not have [9.6.2] any other-speed configs [9.6.4] */
+		if (d) {
+			unsigned max = d->bNumConfigurations;
+			for (i = 0; i < max; i++) {
+				retval = usb_get_descriptor (udev,
+					USB_DT_OTHER_SPEED_CONFIG, i,
+					dev->buf, TBUF_SIZE);
+				if (!is_good_config (dev->buf, retval)) {
+					dev_dbg (&iface->dev,
+						"other speed config --> %d\n",
+						retval);
+					return (retval < 0) ? retval : -EDOM;
+				}
+			}
+		}
+	}
+	// FIXME fetch strings from at least the device descriptor
+
+	/* [9.4.5] get_status always works */
+	retval = usb_get_status (udev, USB_RECIP_DEVICE, 0, dev->buf);
+	if (retval != 2) {
+		dev_dbg (&iface->dev, "get dev status --> %d\n", retval);
+		return (retval < 0) ? retval : -EDOM;
+	}
+
+	// FIXME configuration.bmAttributes says if we could try to set/clear
+	// the device's remote wakeup feature ... if we can, test that here
+
+	retval = usb_get_status (udev, USB_RECIP_INTERFACE,
+			iface->altsetting [0].desc.bInterfaceNumber, dev->buf);
+	if (retval != 2) {
+		dev_dbg (&iface->dev, "get interface status --> %d\n", retval);
+		return (retval < 0) ? retval : -EDOM;
+	}
+	// FIXME get status for each endpoint in the interface
+	
+	return 0;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* use ch9 requests to test whether:
+ *   (a) queues work for control, keeping N subtests queued and
+ *       active (auto-resubmit) for M loops through the queue.
+ *   (b) protocol stalls (control-only) will autorecover.
+ *       it's not like bulk/intr; no halt clearing.
+ *   (c) short control reads are reported and handled.
+ *   (d) queues are always processed in-order
+ */
+
+struct ctrl_ctx {
+	spinlock_t		lock;
+	struct usbtest_dev	*dev;
+	struct completion	complete;
+	unsigned		count;
+	unsigned		pending;
+	int			status;
+	struct urb		**urb;
+	struct usbtest_param	*param;
+	int			last;
+};
+
+#define NUM_SUBCASES	15		/* how many test subcases here? */
+
+struct subcase {
+	struct usb_ctrlrequest	setup;
+	int			number;
+	int			expected;
+};
+
+static void ctrl_complete (struct urb *urb, struct pt_regs *regs)
+{
+	struct ctrl_ctx		*ctx = urb->context;
+	struct usb_ctrlrequest	*reqp;
+	struct subcase		*subcase;
+	int			status = urb->status;
+
+	reqp = (struct usb_ctrlrequest *)urb->setup_packet;
+	subcase = container_of (reqp, struct subcase, setup);
+
+	spin_lock (&ctx->lock);
+	ctx->count--;
+	ctx->pending--;
+
+	/* queue must transfer and complete in fifo order, unless
+	 * usb_unlink_urb() is used to unlink something not at the
+	 * physical queue head (not tested).
+	 */
+	if (subcase->number > 0) {
+		if ((subcase->number - ctx->last) != 1) {
+			dbg ("subcase %d completed out of order, last %d",
+					subcase->number, ctx->last);
+			status = -EDOM;
+			ctx->last = subcase->number;
+			goto error;
+		}
+	}
+	ctx->last = subcase->number;
+
+	/* succeed or fault in only one way? */
+	if (status == subcase->expected)
+		status = 0;
+
+	/* async unlink for cleanup? */
+	else if (status != -ECONNRESET) {
+
+		/* some faults are allowed, not required */
+		if (subcase->expected > 0 && (
+			  ((urb->status == -subcase->expected	/* happened */
+			   || urb->status == 0))))		/* didn't */
+			status = 0;
+		/* sometimes more than one fault is allowed */
+		else if (subcase->number == 12 && status == -EPIPE)
+			status = 0;
+		else
+			dbg ("subtest %d error, status %d",
+					subcase->number, status);
+	}
+
+	/* unexpected status codes mean errors; ideally, in hardware */
+	if (status) {
+error:
+		if (ctx->status == 0) {
+			int		i;
+
+			ctx->status = status;
+			info ("control queue %02x.%02x, err %d, %d left",
+					reqp->bRequestType, reqp->bRequest,
+					status, ctx->count);
+
+			/* FIXME this "unlink everything" exit route should
+			 * be a separate test case.
+			 */
+
+			/* unlink whatever's still pending */
+			for (i = 1; i < ctx->param->sglen; i++) {
+				struct urb	*u = ctx->urb [
+	(i + subcase->number) % ctx->param->sglen];
+
+				if (u == urb || !u->dev)
+					continue;
+				status = usb_unlink_urb (u);
+				switch (status) {
+				case -EINPROGRESS:
+				case -EBUSY:
+				case -EIDRM:
+					continue;
+				default:
+					dbg ("urb unlink --> %d", status);
+				}
+			}
+			status = ctx->status;
+		}
+	}
+
+	/* resubmit if we need to, else mark this as done */
+	if ((status == 0) && (ctx->pending < ctx->count)) {
+		if ((status = usb_submit_urb (urb, SLAB_ATOMIC)) != 0) {
+			dbg ("can't resubmit ctrl %02x.%02x, err %d",
+				reqp->bRequestType, reqp->bRequest, status);
+			urb->dev = NULL;
+		} else
+			ctx->pending++;
+	} else
+		urb->dev = NULL;
+	
+	/* signal completion when nothing's queued */
+	if (ctx->pending == 0)
+		complete (&ctx->complete);
+	spin_unlock (&ctx->lock);
+}
+
+static int
+test_ctrl_queue (struct usbtest_dev *dev, struct usbtest_param *param)
+{
+	struct usb_device	*udev = testdev_to_usbdev (dev);
+	struct urb		**urb;
+	struct ctrl_ctx		context;
+	int			i;
+
+	spin_lock_init (&context.lock);
+	context.dev = dev;
+	init_completion (&context.complete);
+	context.count = param->sglen * param->iterations;
+	context.pending = 0;
+	context.status = -ENOMEM;
+	context.param = param;
+	context.last = -1;
+
+	/* allocate and init the urbs we'll queue.
+	 * as with bulk/intr sglists, sglen is the queue depth; it also
+	 * controls which subtests run (more tests than sglen) or rerun.
+	 */
+	urb = kmalloc (param->sglen * sizeof (struct urb *), SLAB_KERNEL);
+	if (!urb)
+		return -ENOMEM;
+	memset (urb, 0, param->sglen * sizeof (struct urb *));
+	for (i = 0; i < param->sglen; i++) {
+		int			pipe = usb_rcvctrlpipe (udev, 0);
+		unsigned		len;
+		struct urb		*u;
+		struct usb_ctrlrequest	req;
+		struct subcase		*reqp;
+		int			expected = 0;
+
+		/* requests here are mostly expected to succeed on any
+		 * device, but some are chosen to trigger protocol stalls
+		 * or short reads.
+		 */
+		memset (&req, 0, sizeof req);
+		req.bRequest = USB_REQ_GET_DESCRIPTOR;
+		req.bRequestType = USB_DIR_IN|USB_RECIP_DEVICE;
+
+		switch (i % NUM_SUBCASES) {
+		case 0:		// get device descriptor
+			req.wValue = cpu_to_le16 (USB_DT_DEVICE << 8);
+			len = sizeof (struct usb_device_descriptor);
+			break;
+		case 1:		// get first config descriptor (only)
+			req.wValue = cpu_to_le16 ((USB_DT_CONFIG << 8) | 0);
+			len = sizeof (struct usb_config_descriptor);
+			break;
+		case 2:		// get altsetting (OFTEN STALLS)
+			req.bRequest = USB_REQ_GET_INTERFACE;
+			req.bRequestType = USB_DIR_IN|USB_RECIP_INTERFACE;
+			// index = 0 means first interface
+			len = 1;
+			expected = EPIPE;
+			break;
+		case 3:		// get interface status
+			req.bRequest = USB_REQ_GET_STATUS;
+			req.bRequestType = USB_DIR_IN|USB_RECIP_INTERFACE;
+			// interface 0
+			len = 2;
+			break;
+		case 4:		// get device status
+			req.bRequest = USB_REQ_GET_STATUS;
+			req.bRequestType = USB_DIR_IN|USB_RECIP_DEVICE;
+			len = 2;
+			break;
+		case 5:		// get device qualifier (MAY STALL)
+			req.wValue = cpu_to_le16 (USB_DT_DEVICE_QUALIFIER << 8);
+			len = sizeof (struct usb_qualifier_descriptor);
+			if (udev->speed != USB_SPEED_HIGH)
+				expected = EPIPE;
+			break;
+		case 6:		// get first config descriptor, plus interface
+			req.wValue = cpu_to_le16 ((USB_DT_CONFIG << 8) | 0);
+			len = sizeof (struct usb_config_descriptor);
+			len += sizeof (struct usb_interface_descriptor);
+			break;
+		case 7:		// get interface descriptor (ALWAYS STALLS)
+			req.wValue = cpu_to_le16 (USB_DT_INTERFACE << 8);
+			// interface == 0
+			len = sizeof (struct usb_interface_descriptor);
+			expected = EPIPE;
+			break;
+		// NOTE: two consecutive stalls in the queue here.
+		// that tests fault recovery a bit more aggressively.
+		case 8:		// clear endpoint halt (USUALLY STALLS)
+			req.bRequest = USB_REQ_CLEAR_FEATURE;
+			req.bRequestType = USB_RECIP_ENDPOINT;
+			// wValue 0 == ep halt
+			// wIndex 0 == ep0 (shouldn't halt!)
+			len = 0;
+			pipe = usb_sndctrlpipe (udev, 0);
+			expected = EPIPE;
+			break;
+		case 9:		// get endpoint status
+			req.bRequest = USB_REQ_GET_STATUS;
+			req.bRequestType = USB_DIR_IN|USB_RECIP_ENDPOINT;
+			// endpoint 0
+			len = 2;
+			break;
+		case 10:	// trigger short read (EREMOTEIO)
+			req.wValue = cpu_to_le16 ((USB_DT_CONFIG << 8) | 0);
+			len = 1024;
+			expected = -EREMOTEIO;
+			break;
+		// NOTE: two consecutive _different_ faults in the queue.
+		case 11:	// get endpoint descriptor (ALWAYS STALLS)
+			req.wValue = cpu_to_le16 (USB_DT_ENDPOINT << 8);
+			// endpoint == 0
+			len = sizeof (struct usb_interface_descriptor);
+			expected = EPIPE;
+			break;
+		// NOTE: sometimes even a third fault in the queue!
+		case 12:	// get string 0 descriptor (MAY STALL)
+			req.wValue = cpu_to_le16 (USB_DT_STRING << 8);
+			// string == 0, for language IDs
+			len = sizeof (struct usb_interface_descriptor);
+			// may succeed when > 4 languages
+			expected = EREMOTEIO;	// or EPIPE, if no strings
+			break;
+		case 13:	// short read, resembling case 10
+			req.wValue = cpu_to_le16 ((USB_DT_CONFIG << 8) | 0);
+			// last data packet "should" be DATA1, not DATA0
+			len = 1024 - udev->descriptor.bMaxPacketSize0;
+			expected = -EREMOTEIO;
+			break;
+		case 14:	// short read; try to fill the last packet
+			req.wValue = cpu_to_le16 ((USB_DT_DEVICE << 8) | 0);
+			// device descriptor size == 18 bytes 
+			len = udev->descriptor.bMaxPacketSize0;
+			switch (len) {
+			case 8:		len = 24; break;
+			case 16:	len = 32; break;
+			}
+			expected = -EREMOTEIO;
+			break;
+		default:
+			err ("bogus number of ctrl queue testcases!");
+			context.status = -EINVAL;
+			goto cleanup;
+		}
+		req.wLength = cpu_to_le16 (len);
+		urb [i] = u = simple_alloc_urb (udev, pipe, len);
+		if (!u)
+			goto cleanup;
+
+		reqp = usb_buffer_alloc (udev, sizeof *reqp, SLAB_KERNEL,
+				&u->setup_dma);
+		if (!reqp)
+			goto cleanup;
+		reqp->setup = req;
+		reqp->number = i % NUM_SUBCASES;
+		reqp->expected = expected;
+		u->setup_packet = (char *) &reqp->setup;
+
+		u->context = &context;
+		u->complete = ctrl_complete;
+		u->transfer_flags |= URB_ASYNC_UNLINK;
+	}
+
+	/* queue the urbs */
+	context.urb = urb;
+	spin_lock_irq (&context.lock);
+	for (i = 0; i < param->sglen; i++) {
+		context.status = usb_submit_urb (urb [i], SLAB_ATOMIC);
+		if (context.status != 0) {
+			dbg ("can't submit urb[%d], status %d",
+					i, context.status);
+			context.count = context.pending;
+			break;
+		}
+		context.pending++;
+	}
+	spin_unlock_irq (&context.lock);
+
+	/* FIXME  set timer and time out; provide a disconnect hook */
+
+	/* wait for the last one to complete */
+	if (context.pending > 0)
+		wait_for_completion (&context.complete);
+
+cleanup:
+	for (i = 0; i < param->sglen; i++) {
+		if (!urb [i])
+			continue;
+		urb [i]->dev = udev;
+		if (urb [i]->setup_packet)
+			usb_buffer_free (udev, sizeof (struct usb_ctrlrequest),
+					urb [i]->setup_packet,
+					urb [i]->setup_dma);
+		simple_free_urb (urb [i]);
+	}
+	kfree (urb);
+	return context.status;
+}
+#undef NUM_SUBCASES
+
+
+/*-------------------------------------------------------------------------*/
+
+static void unlink1_callback (struct urb *urb, struct pt_regs *regs)
+{
+	int	status = urb->status;
+
+	// we "know" -EPIPE (stall) never happens
+	if (!status)
+		status = usb_submit_urb (urb, SLAB_ATOMIC);
+	if (status) {
+		urb->status = status;
+		complete ((struct completion *) urb->context);
+	}
+}
+
+static int unlink1 (struct usbtest_dev *dev, int pipe, int size, int async)
+{
+	struct urb		*urb;
+	struct completion	completion;
+	int			retval = 0;
+
+	init_completion (&completion);
+	urb = simple_alloc_urb (testdev_to_usbdev (dev), pipe, size);
+	if (!urb)
+		return -ENOMEM;
+	urb->transfer_flags |= URB_ASYNC_UNLINK;
+	urb->context = &completion;
+	urb->complete = unlink1_callback;
+
+	/* keep the endpoint busy.  there are lots of hc/hcd-internal
+	 * states, and testing should get to all of them over time.
+	 *
+	 * FIXME want additional tests for when endpoint is STALLing
+	 * due to errors, or is just NAKing requests.
+	 */
+	if ((retval = usb_submit_urb (urb, SLAB_KERNEL)) != 0) {
+		dev_dbg (&dev->intf->dev, "submit fail %d\n", retval);
+		return retval;
+	}
+
+	/* unlinking that should always work.  variable delay tests more
+	 * hcd states and code paths, even with little other system load.
+	 */
+	msleep (jiffies % (2 * INTERRUPT_RATE));
+	if (async) {
+retry:
+		retval = usb_unlink_urb (urb);
+		if (retval == -EBUSY || retval == -EIDRM) {
+			/* we can't unlink urbs while they're completing.
+			 * or if they've completed, and we haven't resubmitted.
+			 * "normal" drivers would prevent resubmission, but
+			 * since we're testing unlink paths, we can't.
+			 */
+			dev_dbg (&dev->intf->dev, "unlink retry\n");
+			goto retry;
+		}
+	} else
+		usb_kill_urb (urb);
+	if (!(retval == 0 || retval == -EINPROGRESS)) {
+		dev_dbg (&dev->intf->dev, "unlink fail %d\n", retval);
+		return retval;
+	}
+
+	wait_for_completion (&completion);
+	retval = urb->status;
+	simple_free_urb (urb);
+
+	if (async)
+		return (retval == -ECONNRESET) ? 0 : retval - 1000;
+	else
+		return (retval == -ENOENT || retval == -EPERM) ?
+				0 : retval - 2000;
+}
+
+static int unlink_simple (struct usbtest_dev *dev, int pipe, int len)
+{
+	int			retval = 0;
+
+	/* test sync and async paths */
+	retval = unlink1 (dev, pipe, len, 1);
+	if (!retval)
+		retval = unlink1 (dev, pipe, len, 0);
+	return retval;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static int verify_not_halted (int ep, struct urb *urb)
+{
+	int	retval;
+	u16	status;
+
+	/* shouldn't look or act halted */
+	retval = usb_get_status (urb->dev, USB_RECIP_ENDPOINT, ep, &status);
+	if (retval < 0) {
+		dbg ("ep %02x couldn't get no-halt status, %d", ep, retval);
+		return retval;
+	}
+	if (status != 0) {
+		dbg ("ep %02x bogus status: %04x != 0", ep, status);
+		return -EINVAL;
+	}
+	retval = simple_io (urb, 1, 0, 0, __FUNCTION__);
+	if (retval != 0)
+		return -EINVAL;
+	return 0;
+}
+
+static int verify_halted (int ep, struct urb *urb)
+{
+	int	retval;
+	u16	status;
+
+	/* should look and act halted */
+	retval = usb_get_status (urb->dev, USB_RECIP_ENDPOINT, ep, &status);
+	if (retval < 0) {
+		dbg ("ep %02x couldn't get halt status, %d", ep, retval);
+		return retval;
+	}
+	if (status != 1) {
+		dbg ("ep %02x bogus status: %04x != 1", ep, status);
+		return -EINVAL;
+	}
+	retval = simple_io (urb, 1, 0, -EPIPE, __FUNCTION__);
+	if (retval != -EPIPE)
+		return -EINVAL;
+	retval = simple_io (urb, 1, 0, -EPIPE, "verify_still_halted");
+	if (retval != -EPIPE)
+		return -EINVAL;
+	return 0;
+}
+
+static int test_halt (int ep, struct urb *urb)
+{
+	int	retval;
+
+	/* shouldn't look or act halted now */
+	retval = verify_not_halted (ep, urb);
+	if (retval < 0)
+		return retval;
+
+	/* set halt (protocol test only), verify it worked */
+	retval = usb_control_msg (urb->dev, usb_sndctrlpipe (urb->dev, 0),
+			USB_REQ_SET_FEATURE, USB_RECIP_ENDPOINT,
+			USB_ENDPOINT_HALT, ep,
+			NULL, 0, USB_CTRL_SET_TIMEOUT);
+	if (retval < 0) {
+		dbg ("ep %02x couldn't set halt, %d", ep, retval);
+		return retval;
+	}
+	retval = verify_halted (ep, urb);
+	if (retval < 0)
+		return retval;
+
+	/* clear halt (tests API + protocol), verify it worked */
+	retval = usb_clear_halt (urb->dev, urb->pipe);
+	if (retval < 0) {
+		dbg ("ep %02x couldn't clear halt, %d", ep, retval);
+		return retval;
+	}
+	retval = verify_not_halted (ep, urb);
+	if (retval < 0)
+		return retval;
+
+	/* NOTE:  could also verify SET_INTERFACE clear halts ... */
+
+	return 0;
+}
+
+static int halt_simple (struct usbtest_dev *dev)
+{
+	int		ep;
+	int		retval = 0;
+	struct urb	*urb;
+
+	urb = simple_alloc_urb (testdev_to_usbdev (dev), 0, 512);
+	if (urb == NULL)
+		return -ENOMEM;
+
+	if (dev->in_pipe) {
+		ep = usb_pipeendpoint (dev->in_pipe) | USB_DIR_IN;
+		urb->pipe = dev->in_pipe;
+		retval = test_halt (ep, urb);
+		if (retval < 0)
+			goto done;
+	}
+
+	if (dev->out_pipe) {
+		ep = usb_pipeendpoint (dev->out_pipe);
+		urb->pipe = dev->out_pipe;
+		retval = test_halt (ep, urb);
+	}
+done:
+	simple_free_urb (urb);
+	return retval;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* Control OUT tests use the vendor control requests from Intel's
+ * USB 2.0 compliance test device:  write a buffer, read it back.
+ *
+ * Intel's spec only _requires_ that it work for one packet, which
+ * is pretty weak.   Some HCDs place limits here; most devices will
+ * need to be able to handle more than one OUT data packet.  We'll
+ * try whatever we're told to try.
+ */
+static int ctrl_out (struct usbtest_dev *dev,
+		unsigned count, unsigned length, unsigned vary)
+{
+	unsigned		i, j, len, retval;
+	u8			*buf;
+	char			*what = "?";
+	struct usb_device	*udev;
+	
+	if (length > 0xffff || vary >= length)
+		return -EINVAL;
+
+	buf = kmalloc(length, SLAB_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	udev = testdev_to_usbdev (dev);
+	len = length;
+	retval = 0;
+
+	/* NOTE:  hardware might well act differently if we pushed it
+	 * with lots back-to-back queued requests.
+	 */
+	for (i = 0; i < count; i++) {
+		/* write patterned data */
+		for (j = 0; j < len; j++)
+			buf [j] = i + j;
+		retval = usb_control_msg (udev, usb_sndctrlpipe (udev,0),
+				0x5b, USB_DIR_OUT|USB_TYPE_VENDOR,
+				0, 0, buf, len, USB_CTRL_SET_TIMEOUT);
+		if (retval != len) {
+			what = "write";
+			break;
+		}
+
+		/* read it back -- assuming nothing intervened!!  */
+		retval = usb_control_msg (udev, usb_rcvctrlpipe (udev,0),
+				0x5c, USB_DIR_IN|USB_TYPE_VENDOR,
+				0, 0, buf, len, USB_CTRL_GET_TIMEOUT);
+		if (retval != len) {
+			what = "read";
+			break;
+		}
+
+		/* fail if we can't verify */
+		for (j = 0; j < len; j++) {
+			if (buf [j] != (u8) (i + j)) {
+				INFO (dev, "ctrl_out, byte %d is %d not %d\n",
+					j, buf [j], (u8) i + j);
+				retval = -EBADMSG;
+				break;
+			}
+		}
+		if (retval < 0) {
+			what = "verify";
+			break;
+		}
+
+		len += vary;
+		if (len > length)
+			len = 0;
+	}
+
+	if (retval < 0)
+		INFO (dev, "ctrl_out %s failed, code %d, count %d\n",
+			what, retval, i);
+
+	kfree (buf);
+	return retval;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* ISO tests ... mimics common usage
+ *  - buffer length is split into N packets (mostly maxpacket sized)
+ *  - multi-buffers according to sglen
+ */
+
+struct iso_context {
+	unsigned		count;
+	unsigned		pending;
+	spinlock_t		lock;
+	struct completion	done;
+	unsigned long		errors;
+	struct usbtest_dev	*dev;
+};
+
+static void iso_callback (struct urb *urb, struct pt_regs *regs)
+{
+	struct iso_context	*ctx = urb->context;
+
+	spin_lock(&ctx->lock);
+	ctx->count--;
+
+	if (urb->error_count > 0)
+		ctx->errors += urb->error_count;
+
+	if (urb->status == 0 && ctx->count > (ctx->pending - 1)) {
+		int status = usb_submit_urb (urb, GFP_ATOMIC);
+		switch (status) {
+		case 0:
+			goto done;
+		default:
+			dev_dbg (&ctx->dev->intf->dev,
+					"iso resubmit err %d\n",
+					status);
+			/* FALLTHROUGH */
+		case -ENODEV:			/* disconnected */
+			break;
+		}
+	}
+	simple_free_urb (urb);
+
+	ctx->pending--;
+	if (ctx->pending == 0) {
+		if (ctx->errors)
+			dev_dbg (&ctx->dev->intf->dev,
+				"iso test, %lu errors\n",
+				ctx->errors);
+		complete (&ctx->done);
+	}
+done:
+	spin_unlock(&ctx->lock);
+}
+
+static struct urb *iso_alloc_urb (
+	struct usb_device	*udev,
+	int			pipe,
+	struct usb_endpoint_descriptor	*desc,
+	long			bytes
+)
+{
+	struct urb		*urb;
+	unsigned		i, maxp, packets;
+
+	if (bytes < 0 || !desc)
+		return NULL;
+	maxp = 0x7ff & le16_to_cpu(desc->wMaxPacketSize);
+	maxp *= 1 + (0x3 & (le16_to_cpu(desc->wMaxPacketSize) >> 11));
+	packets = (bytes + maxp - 1) / maxp;
+
+	urb = usb_alloc_urb (packets, SLAB_KERNEL);
+	if (!urb)
+		return urb;
+	urb->dev = udev;
+	urb->pipe = pipe;
+
+	urb->number_of_packets = packets;
+	urb->transfer_buffer_length = bytes;
+	urb->transfer_buffer = usb_buffer_alloc (udev, bytes, SLAB_KERNEL,
+			&urb->transfer_dma);
+	if (!urb->transfer_buffer) {
+		usb_free_urb (urb);
+		return NULL;
+	}
+	memset (urb->transfer_buffer, 0, bytes);
+	for (i = 0; i < packets; i++) {
+		/* here, only the last packet will be short */
+		urb->iso_frame_desc[i].length = min ((unsigned) bytes, maxp);
+		bytes -= urb->iso_frame_desc[i].length;
+
+		urb->iso_frame_desc[i].offset = maxp * i;
+	}
+
+	urb->complete = iso_callback;
+	// urb->context = SET BY CALLER
+	urb->interval = 1 << (desc->bInterval - 1);
+	urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP;
+	return urb;
+}
+
+static int
+test_iso_queue (struct usbtest_dev *dev, struct usbtest_param *param,
+		int pipe, struct usb_endpoint_descriptor *desc)
+{
+	struct iso_context	context;
+	struct usb_device	*udev;
+	unsigned		i;
+	unsigned long		packets = 0;
+	int			status;
+	struct urb		*urbs[10];	/* FIXME no limit */
+
+	if (param->sglen > 10)
+		return -EDOM;
+
+	context.count = param->iterations * param->sglen;
+	context.pending = param->sglen;
+	context.errors = 0;
+	context.dev = dev;
+	init_completion (&context.done);
+	spin_lock_init (&context.lock);
+
+	memset (urbs, 0, sizeof urbs);
+	udev = testdev_to_usbdev (dev);
+	dev_dbg (&dev->intf->dev,
+		"... iso period %d %sframes, wMaxPacket %04x\n",
+		1 << (desc->bInterval - 1),
+		(udev->speed == USB_SPEED_HIGH) ? "micro" : "",
+		le16_to_cpu(desc->wMaxPacketSize));
+
+	for (i = 0; i < param->sglen; i++) {
+		urbs [i] = iso_alloc_urb (udev, pipe, desc,
+				param->length);
+		if (!urbs [i]) {
+			status = -ENOMEM;
+			goto fail;
+		}
+		packets += urbs[i]->number_of_packets;
+		urbs [i]->context = &context;
+	}
+	packets *= param->iterations;
+	dev_dbg (&dev->intf->dev,
+		"... total %lu msec (%lu packets)\n",
+		(packets * (1 << (desc->bInterval - 1)))
+			/ ((udev->speed == USB_SPEED_HIGH) ? 8 : 1),
+		packets);
+
+	spin_lock_irq (&context.lock);
+	for (i = 0; i < param->sglen; i++) {
+		status = usb_submit_urb (urbs [i], SLAB_ATOMIC);
+		if (status < 0) {
+			ERROR (dev, "submit iso[%d], error %d\n", i, status);
+			if (i == 0) {
+				spin_unlock_irq (&context.lock);
+				goto fail;
+			}
+
+			simple_free_urb (urbs [i]);
+			context.pending--;
+		}
+	}
+	spin_unlock_irq (&context.lock);
+
+	wait_for_completion (&context.done);
+	return 0;
+
+fail:
+	for (i = 0; i < param->sglen; i++) {
+		if (urbs [i])
+			simple_free_urb (urbs [i]);
+	}
+	return status;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* We only have this one interface to user space, through usbfs.
+ * User mode code can scan usbfs to find N different devices (maybe on
+ * different busses) to use when testing, and allocate one thread per
+ * test.  So discovery is simplified, and we have no device naming issues.
+ *
+ * Don't use these only as stress/load tests.  Use them along with with
+ * other USB bus activity:  plugging, unplugging, mousing, mp3 playback,
+ * video capture, and so on.  Run different tests at different times, in
+ * different sequences.  Nothing here should interact with other devices,
+ * except indirectly by consuming USB bandwidth and CPU resources for test
+ * threads and request completion.  But the only way to know that for sure
+ * is to test when HC queues are in use by many devices.
+ */
+
+static int
+usbtest_ioctl (struct usb_interface *intf, unsigned int code, void *buf)
+{
+	struct usbtest_dev	*dev = usb_get_intfdata (intf);
+	struct usb_device	*udev = testdev_to_usbdev (dev);
+	struct usbtest_param	*param = buf;
+	int			retval = -EOPNOTSUPP;
+	struct urb		*urb;
+	struct scatterlist	*sg;
+	struct usb_sg_request	req;
+	struct timeval		start;
+	unsigned		i;
+
+	// FIXME USBDEVFS_CONNECTINFO doesn't say how fast the device is.
+
+	if (code != USBTEST_REQUEST)
+		return -EOPNOTSUPP;
+
+	if (param->iterations <= 0 || param->length < 0
+			|| param->sglen < 0 || param->vary < 0)
+		return -EINVAL;
+
+	if (down_interruptible (&dev->sem))
+		return -ERESTARTSYS;
+
+	/* some devices, like ez-usb default devices, need a non-default
+	 * altsetting to have any active endpoints.  some tests change
+	 * altsettings; force a default so most tests don't need to check.
+	 */
+	if (dev->info->alt >= 0) {
+	    	int	res;
+
+		if (intf->altsetting->desc.bInterfaceNumber) {
+			up (&dev->sem);
+			return -ENODEV;
+		}
+		res = set_altsetting (dev, dev->info->alt);
+		if (res) {
+			dev_err (&intf->dev,
+					"set altsetting to %d failed, %d\n",
+					dev->info->alt, res);
+			up (&dev->sem);
+			return res;
+		}
+	}
+
+	/*
+	 * Just a bunch of test cases that every HCD is expected to handle.
+	 *
+	 * Some may need specific firmware, though it'd be good to have
+	 * one firmware image to handle all the test cases.
+	 *
+	 * FIXME add more tests!  cancel requests, verify the data, control
+	 * queueing, concurrent read+write threads, and so on.
+	 */
+	do_gettimeofday (&start);
+	switch (param->test_num) {
+
+	case 0:
+		dev_dbg (&intf->dev, "TEST 0:  NOP\n");
+		retval = 0;
+		break;
+
+	/* Simple non-queued bulk I/O tests */
+	case 1:
+		if (dev->out_pipe == 0)
+			break;
+		dev_dbg (&intf->dev,
+				"TEST 1:  write %d bytes %u times\n",
+				param->length, param->iterations);
+		urb = simple_alloc_urb (udev, dev->out_pipe, param->length);
+		if (!urb) {
+			retval = -ENOMEM;
+			break;
+		}
+		// FIRMWARE:  bulk sink (maybe accepts short writes)
+		retval = simple_io (urb, param->iterations, 0, 0, "test1");
+		simple_free_urb (urb);
+		break;
+	case 2:
+		if (dev->in_pipe == 0)
+			break;
+		dev_dbg (&intf->dev,
+				"TEST 2:  read %d bytes %u times\n",
+				param->length, param->iterations);
+		urb = simple_alloc_urb (udev, dev->in_pipe, param->length);
+		if (!urb) {
+			retval = -ENOMEM;
+			break;
+		}
+		// FIRMWARE:  bulk source (maybe generates short writes)
+		retval = simple_io (urb, param->iterations, 0, 0, "test2");
+		simple_free_urb (urb);
+		break;
+	case 3:
+		if (dev->out_pipe == 0 || param->vary == 0)
+			break;
+		dev_dbg (&intf->dev,
+				"TEST 3:  write/%d 0..%d bytes %u times\n",
+				param->vary, param->length, param->iterations);
+		urb = simple_alloc_urb (udev, dev->out_pipe, param->length);
+		if (!urb) {
+			retval = -ENOMEM;
+			break;
+		}
+		// FIRMWARE:  bulk sink (maybe accepts short writes)
+		retval = simple_io (urb, param->iterations, param->vary,
+					0, "test3");
+		simple_free_urb (urb);
+		break;
+	case 4:
+		if (dev->in_pipe == 0 || param->vary == 0)
+			break;
+		dev_dbg (&intf->dev,
+				"TEST 4:  read/%d 0..%d bytes %u times\n",
+				param->vary, param->length, param->iterations);
+		urb = simple_alloc_urb (udev, dev->in_pipe, param->length);
+		if (!urb) {
+			retval = -ENOMEM;
+			break;
+		}
+		// FIRMWARE:  bulk source (maybe generates short writes)
+		retval = simple_io (urb, param->iterations, param->vary,
+					0, "test4");
+		simple_free_urb (urb);
+		break;
+
+	/* Queued bulk I/O tests */
+	case 5:
+		if (dev->out_pipe == 0 || param->sglen == 0)
+			break;
+		dev_dbg (&intf->dev,
+			"TEST 5:  write %d sglists %d entries of %d bytes\n",
+				param->iterations,
+				param->sglen, param->length);
+		sg = alloc_sglist (param->sglen, param->length, 0);
+		if (!sg) {
+			retval = -ENOMEM;
+			break;
+		}
+		// FIRMWARE:  bulk sink (maybe accepts short writes)
+		retval = perform_sglist (udev, param->iterations, dev->out_pipe,
+				&req, sg, param->sglen);
+		free_sglist (sg, param->sglen);
+		break;
+
+	case 6:
+		if (dev->in_pipe == 0 || param->sglen == 0)
+			break;
+		dev_dbg (&intf->dev,
+			"TEST 6:  read %d sglists %d entries of %d bytes\n",
+				param->iterations,
+				param->sglen, param->length);
+		sg = alloc_sglist (param->sglen, param->length, 0);
+		if (!sg) {
+			retval = -ENOMEM;
+			break;
+		}
+		// FIRMWARE:  bulk source (maybe generates short writes)
+		retval = perform_sglist (udev, param->iterations, dev->in_pipe,
+				&req, sg, param->sglen);
+		free_sglist (sg, param->sglen);
+		break;
+	case 7:
+		if (dev->out_pipe == 0 || param->sglen == 0 || param->vary == 0)
+			break;
+		dev_dbg (&intf->dev,
+			"TEST 7:  write/%d %d sglists %d entries 0..%d bytes\n",
+				param->vary, param->iterations,
+				param->sglen, param->length);
+		sg = alloc_sglist (param->sglen, param->length, param->vary);
+		if (!sg) {
+			retval = -ENOMEM;
+			break;
+		}
+		// FIRMWARE:  bulk sink (maybe accepts short writes)
+		retval = perform_sglist (udev, param->iterations, dev->out_pipe,
+				&req, sg, param->sglen);
+		free_sglist (sg, param->sglen);
+		break;
+	case 8:
+		if (dev->in_pipe == 0 || param->sglen == 0 || param->vary == 0)
+			break;
+		dev_dbg (&intf->dev,
+			"TEST 8:  read/%d %d sglists %d entries 0..%d bytes\n",
+				param->vary, param->iterations,
+				param->sglen, param->length);
+		sg = alloc_sglist (param->sglen, param->length, param->vary);
+		if (!sg) {
+			retval = -ENOMEM;
+			break;
+		}
+		// FIRMWARE:  bulk source (maybe generates short writes)
+		retval = perform_sglist (udev, param->iterations, dev->in_pipe,
+				&req, sg, param->sglen);
+		free_sglist (sg, param->sglen);
+		break;
+
+	/* non-queued sanity tests for control (chapter 9 subset) */
+	case 9:
+		retval = 0;
+		dev_dbg (&intf->dev,
+			"TEST 9:  ch9 (subset) control tests, %d times\n",
+				param->iterations);
+		for (i = param->iterations; retval == 0 && i--; /* NOP */)
+			retval = ch9_postconfig (dev);
+		if (retval)
+			dbg ("ch9 subset failed, iterations left %d", i);
+		break;
+
+	/* queued control messaging */
+	case 10:
+		if (param->sglen == 0)
+			break;
+		retval = 0;
+		dev_dbg (&intf->dev,
+				"TEST 10:  queue %d control calls, %d times\n",
+				param->sglen,
+				param->iterations);
+		retval = test_ctrl_queue (dev, param);
+		break;
+
+	/* simple non-queued unlinks (ring with one urb) */
+	case 11:
+		if (dev->in_pipe == 0 || !param->length)
+			break;
+		retval = 0;
+		dev_dbg (&intf->dev, "TEST 11:  unlink %d reads of %d\n",
+				param->iterations, param->length);
+		for (i = param->iterations; retval == 0 && i--; /* NOP */)
+			retval = unlink_simple (dev, dev->in_pipe,
+						param->length);
+		if (retval)
+			dev_dbg (&intf->dev, "unlink reads failed %d, "
+				"iterations left %d\n", retval, i);
+		break;
+	case 12:
+		if (dev->out_pipe == 0 || !param->length)
+			break;
+		retval = 0;
+		dev_dbg (&intf->dev, "TEST 12:  unlink %d writes of %d\n",
+				param->iterations, param->length);
+		for (i = param->iterations; retval == 0 && i--; /* NOP */)
+			retval = unlink_simple (dev, dev->out_pipe,
+						param->length);
+		if (retval)
+			dev_dbg (&intf->dev, "unlink writes failed %d, "
+				"iterations left %d\n", retval, i);
+		break;
+
+	/* ep halt tests */
+	case 13:
+		if (dev->out_pipe == 0 && dev->in_pipe == 0)
+			break;
+		retval = 0;
+		dev_dbg (&intf->dev, "TEST 13:  set/clear %d halts\n",
+				param->iterations);
+		for (i = param->iterations; retval == 0 && i--; /* NOP */)
+			retval = halt_simple (dev);
+		
+		if (retval)
+			DBG (dev, "halts failed, iterations left %d\n", i);
+		break;
+
+	/* control write tests */
+	case 14:
+		if (!dev->info->ctrl_out)
+			break;
+		dev_dbg (&intf->dev, "TEST 14:  %d ep0out, 0..%d vary %d\n",
+				param->iterations, param->length, param->vary);
+		retval = ctrl_out (dev, param->iterations, 
+				param->length, param->vary);
+		break;
+
+	/* iso write tests */
+	case 15:
+		if (dev->out_iso_pipe == 0 || param->sglen == 0)
+			break;
+		dev_dbg (&intf->dev, 
+			"TEST 15:  write %d iso, %d entries of %d bytes\n",
+				param->iterations,
+				param->sglen, param->length);
+		// FIRMWARE:  iso sink
+		retval = test_iso_queue (dev, param,
+				dev->out_iso_pipe, dev->iso_out);
+		break;
+
+	/* iso read tests */
+	case 16:
+		if (dev->in_iso_pipe == 0 || param->sglen == 0)
+			break;
+		dev_dbg (&intf->dev,
+			"TEST 16:  read %d iso, %d entries of %d bytes\n",
+				param->iterations,
+				param->sglen, param->length);
+		// FIRMWARE:  iso source
+		retval = test_iso_queue (dev, param,
+				dev->in_iso_pipe, dev->iso_in);
+		break;
+
+	// FIXME unlink from queue (ring with N urbs)
+
+	// FIXME scatterlist cancel (needs helper thread)
+
+	}
+	do_gettimeofday (&param->duration);
+	param->duration.tv_sec -= start.tv_sec;
+	param->duration.tv_usec -= start.tv_usec;
+	if (param->duration.tv_usec < 0) {
+		param->duration.tv_usec += 1000 * 1000;
+		param->duration.tv_sec -= 1;
+	}
+	up (&dev->sem);
+	return retval;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static unsigned force_interrupt = 0;
+module_param (force_interrupt, uint, 0);
+MODULE_PARM_DESC (force_interrupt, "0 = test default; else interrupt");
+
+#ifdef	GENERIC
+static unsigned short vendor;
+module_param(vendor, ushort, 0);
+MODULE_PARM_DESC (vendor, "vendor code (from usb-if)");
+
+static unsigned short product;
+module_param(product, ushort, 0);
+MODULE_PARM_DESC (product, "product code (from vendor)");
+#endif
+
+static int
+usbtest_probe (struct usb_interface *intf, const struct usb_device_id *id)
+{
+	struct usb_device	*udev;
+	struct usbtest_dev	*dev;
+	struct usbtest_info	*info;
+	char			*rtest, *wtest;
+	char			*irtest, *iwtest;
+
+	udev = interface_to_usbdev (intf);
+
+#ifdef	GENERIC
+	/* specify devices by module parameters? */
+	if (id->match_flags == 0) {
+		/* vendor match required, product match optional */
+		if (!vendor || le16_to_cpu(udev->descriptor.idVendor) != (u16)vendor)
+			return -ENODEV;
+		if (product && le16_to_cpu(udev->descriptor.idProduct) != (u16)product)
+			return -ENODEV;
+		dbg ("matched module params, vend=0x%04x prod=0x%04x",
+				le16_to_cpu(udev->descriptor.idVendor),
+				le16_to_cpu(udev->descriptor.idProduct));
+	}
+#endif
+
+	dev = kmalloc (sizeof *dev, SLAB_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+	memset (dev, 0, sizeof *dev);
+	info = (struct usbtest_info *) id->driver_info;
+	dev->info = info;
+	init_MUTEX (&dev->sem);
+
+	dev->intf = intf;
+
+	/* cacheline-aligned scratch for i/o */
+	if ((dev->buf = kmalloc (TBUF_SIZE, SLAB_KERNEL)) == NULL) {
+		kfree (dev);
+		return -ENOMEM;
+	}
+
+	/* NOTE this doesn't yet test the handful of difference that are
+	 * visible with high speed interrupts:  bigger maxpacket (1K) and
+	 * "high bandwidth" modes (up to 3 packets/uframe).
+	 */
+	rtest = wtest = "";
+	irtest = iwtest = "";
+	if (force_interrupt || udev->speed == USB_SPEED_LOW) {
+		if (info->ep_in) {
+			dev->in_pipe = usb_rcvintpipe (udev, info->ep_in);
+			rtest = " intr-in";
+		}
+		if (info->ep_out) {
+			dev->out_pipe = usb_sndintpipe (udev, info->ep_out);
+			wtest = " intr-out";
+		}
+	} else {
+		if (info->autoconf) {
+			int status;
+
+			status = get_endpoints (dev, intf);
+			if (status < 0) {
+				dbg ("couldn't get endpoints, %d\n", status);
+				return status;
+			}
+			/* may find bulk or ISO pipes */
+		} else {
+			if (info->ep_in)
+				dev->in_pipe = usb_rcvbulkpipe (udev,
+							info->ep_in);
+			if (info->ep_out)
+				dev->out_pipe = usb_sndbulkpipe (udev,
+							info->ep_out);
+		}
+		if (dev->in_pipe)
+			rtest = " bulk-in";
+		if (dev->out_pipe)
+			wtest = " bulk-out";
+		if (dev->in_iso_pipe)
+			irtest = " iso-in";
+		if (dev->out_iso_pipe)
+			iwtest = " iso-out";
+	}
+
+	usb_set_intfdata (intf, dev);
+	dev_info (&intf->dev, "%s\n", info->name);
+	dev_info (&intf->dev, "%s speed {control%s%s%s%s%s} tests%s\n",
+			({ char *tmp;
+			switch (udev->speed) {
+			case USB_SPEED_LOW: tmp = "low"; break;
+			case USB_SPEED_FULL: tmp = "full"; break;
+			case USB_SPEED_HIGH: tmp = "high"; break;
+			default: tmp = "unknown"; break;
+			}; tmp; }),
+			info->ctrl_out ? " in/out" : "",
+			rtest, wtest,
+			irtest, iwtest,
+			info->alt >= 0 ? " (+alt)" : "");
+	return 0;
+}
+
+static void usbtest_disconnect (struct usb_interface *intf)
+{
+	struct usbtest_dev	*dev = usb_get_intfdata (intf);
+
+	down (&dev->sem);
+
+	usb_set_intfdata (intf, NULL);
+	dev_dbg (&intf->dev, "disconnect\n");
+	kfree (dev);
+}
+
+/* Basic testing only needs a device that can source or sink bulk traffic.
+ * Any device can test control transfers (default with GENERIC binding).
+ *
+ * Several entries work with the default EP0 implementation that's built
+ * into EZ-USB chips.  There's a default vendor ID which can be overridden
+ * by (very) small config EEPROMS, but otherwise all these devices act
+ * identically until firmware is loaded:  only EP0 works.  It turns out
+ * to be easy to make other endpoints work, without modifying that EP0
+ * behavior.  For now, we expect that kind of firmware.
+ */
+
+/* an21xx or fx versions of ez-usb */
+static struct usbtest_info ez1_info = {
+	.name		= "EZ-USB device",
+	.ep_in		= 2,
+	.ep_out		= 2,
+	.alt		= 1,
+};
+
+/* fx2 version of ez-usb */
+static struct usbtest_info ez2_info = {
+	.name		= "FX2 device",
+	.ep_in		= 6,
+	.ep_out		= 2,
+	.alt		= 1,
+};
+
+/* ezusb family device with dedicated usb test firmware,
+ */
+static struct usbtest_info fw_info = {
+	.name		= "usb test device",
+	.ep_in		= 2,
+	.ep_out		= 2,
+	.alt		= 1,
+	.autoconf	= 1,		// iso and ctrl_out need autoconf
+	.ctrl_out	= 1,
+	.iso		= 1,		// iso_ep's are #8 in/out
+};
+
+/* peripheral running Linux and 'zero.c' test firmware, or
+ * its user-mode cousin. different versions of this use
+ * different hardware with the same vendor/product codes.
+ * host side MUST rely on the endpoint descriptors.
+ */
+static struct usbtest_info gz_info = {
+	.name		= "Linux gadget zero",
+	.autoconf	= 1,
+	.ctrl_out	= 1,
+	.alt		= 0,
+};
+
+static struct usbtest_info um_info = {
+	.name		= "Linux user mode test driver",
+	.autoconf	= 1,
+	.alt		= -1,
+};
+
+static struct usbtest_info um2_info = {
+	.name		= "Linux user mode ISO test driver",
+	.autoconf	= 1,
+	.iso		= 1,
+	.alt		= -1,
+};
+
+#ifdef IBOT2
+/* this is a nice source of high speed bulk data;
+ * uses an FX2, with firmware provided in the device
+ */
+static struct usbtest_info ibot2_info = {
+	.name		= "iBOT2 webcam",
+	.ep_in		= 2,
+	.alt		= -1,
+};
+#endif
+
+#ifdef GENERIC
+/* we can use any device to test control traffic */
+static struct usbtest_info generic_info = {
+	.name		= "Generic USB device",
+	.alt		= -1,
+};
+#endif
+
+// FIXME remove this 
+static struct usbtest_info hact_info = {
+	.name		= "FX2/hact",
+	//.ep_in		= 6,
+	.ep_out		= 2,
+	.alt		= -1,
+};
+
+
+static struct usb_device_id id_table [] = {
+
+	{ USB_DEVICE (0x0547, 0x1002),
+		.driver_info = (unsigned long) &hact_info,
+		},
+
+	/*-------------------------------------------------------------*/
+
+	/* EZ-USB devices which download firmware to replace (or in our
+	 * case augment) the default device implementation.
+	 */
+
+	/* generic EZ-USB FX controller */
+	{ USB_DEVICE (0x0547, 0x2235),
+		.driver_info = (unsigned long) &ez1_info,
+		},
+
+	/* CY3671 development board with EZ-USB FX */
+	{ USB_DEVICE (0x0547, 0x0080),
+		.driver_info = (unsigned long) &ez1_info,
+		},
+
+	/* generic EZ-USB FX2 controller (or development board) */
+	{ USB_DEVICE (0x04b4, 0x8613),
+		.driver_info = (unsigned long) &ez2_info,
+		},
+
+	/* re-enumerated usb test device firmware */
+	{ USB_DEVICE (0xfff0, 0xfff0),
+		.driver_info = (unsigned long) &fw_info,
+		},
+
+	/* "Gadget Zero" firmware runs under Linux */
+	{ USB_DEVICE (0x0525, 0xa4a0),
+		.driver_info = (unsigned long) &gz_info,
+		},
+
+	/* so does a user-mode variant */
+	{ USB_DEVICE (0x0525, 0xa4a4),
+		.driver_info = (unsigned long) &um_info,
+		},
+
+	/* ... and a user-mode variant that talks iso */
+	{ USB_DEVICE (0x0525, 0xa4a3),
+		.driver_info = (unsigned long) &um2_info,
+		},
+
+#ifdef KEYSPAN_19Qi
+	/* Keyspan 19qi uses an21xx (original EZ-USB) */
+	// this does not coexist with the real Keyspan 19qi driver!
+	{ USB_DEVICE (0x06cd, 0x010b),
+		.driver_info = (unsigned long) &ez1_info,
+		},
+#endif
+
+	/*-------------------------------------------------------------*/
+
+#ifdef IBOT2
+	/* iBOT2 makes a nice source of high speed bulk-in data */
+	// this does not coexist with a real iBOT2 driver!
+	{ USB_DEVICE (0x0b62, 0x0059),
+		.driver_info = (unsigned long) &ibot2_info,
+		},
+#endif
+
+	/*-------------------------------------------------------------*/
+
+#ifdef GENERIC
+	/* module params can specify devices to use for control tests */
+	{ .driver_info = (unsigned long) &generic_info, },
+#endif
+
+	/*-------------------------------------------------------------*/
+
+	{ }
+};
+MODULE_DEVICE_TABLE (usb, id_table);
+
+static struct usb_driver usbtest_driver = {
+	.owner =	THIS_MODULE,
+	.name =		"usbtest",
+	.id_table =	id_table,
+	.probe =	usbtest_probe,
+	.ioctl =	usbtest_ioctl,
+	.disconnect =	usbtest_disconnect,
+};
+
+/*-------------------------------------------------------------------------*/
+
+static int __init usbtest_init (void)
+{
+#ifdef GENERIC
+	if (vendor)
+		dbg ("params: vend=0x%04x prod=0x%04x", vendor, product);
+#endif
+	return usb_register (&usbtest_driver);
+}
+module_init (usbtest_init);
+
+static void __exit usbtest_exit (void)
+{
+	usb_deregister (&usbtest_driver);
+}
+module_exit (usbtest_exit);
+
+MODULE_DESCRIPTION ("USB Core/HCD Testing Driver");
+MODULE_LICENSE ("GPL");
+