Merge remote-tracking branch 'kraxel/usb.80' into staging

# By Gerd Hoffmann (6) and Hans de Goede (1)
# Via Gerd Hoffmann
* kraxel/usb.80:
  use libusb for usb-host
  xhci: fix address device
  xhci: use slotid as device address
  xhci: fix portsc writes
  xhci: add xhci_cap_write
  xhci: remove leftover debug printf
  usb-serial: Remove double call to qemu_chr_add_handlers( NULL )

Message-id: 1366107190-30853-1-git-send-email-kraxel@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

4 files changed, 1510 insertions, 41 deletions

diff --git a/hw/usb/dev-serial.c b/hw/usb/dev-serial.c
index dd0a608..2fc8a3b 100644
--- a/hw/usb/dev-serial.c
+++ b/hw/usb/dev-serial.c
@@ -410,13 +410,6 @@ static void usb_serial_handle_data(USBDevice *dev, USBPacket *p)
     }
 }
 
-static void usb_serial_handle_destroy(USBDevice *dev)
-{
-    USBSerialState *s = (USBSerialState *)dev;
-
-    qemu_chr_add_handlers(s->cs, NULL, NULL, NULL, NULL);
-}
-
 static int usb_serial_can_read(void *opaque)
 {
     USBSerialState *s = opaque;
@@ -595,7 +588,6 @@ static void usb_serial_class_initfn(ObjectClass *klass, void *data)
     uc->handle_reset   = usb_serial_handle_reset;
     uc->handle_control = usb_serial_handle_control;
     uc->handle_data    = usb_serial_handle_data;
-    uc->handle_destroy = usb_serial_handle_destroy;
     dc->vmsd = &vmstate_usb_serial;
     dc->props = serial_properties;
 }
@@ -623,7 +615,6 @@ static void usb_braille_class_initfn(ObjectClass *klass, void *data)
     uc->handle_reset   = usb_serial_handle_reset;
     uc->handle_control = usb_serial_handle_control;
     uc->handle_data    = usb_serial_handle_data;
-    uc->handle_destroy = usb_serial_handle_destroy;
     dc->vmsd = &vmstate_usb_serial;
     dc->props = braille_properties;
 }
diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index efd4b0d..a26b78e 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -408,7 +408,6 @@ typedef struct XHCISlot {
     bool enabled;
     dma_addr_t ctx;
     USBPort *uport;
-    unsigned int devaddr;
     XHCIEPContext * eps[31];
 } XHCISlot;
 
@@ -452,7 +451,6 @@ struct XHCIState {
     MemoryRegion mem_oper;
     MemoryRegion mem_runtime;
     MemoryRegion mem_doorbell;
-    unsigned int devaddr;
 
     /* properties */
     uint32_t numports_2;
@@ -2141,16 +2139,18 @@ static TRBCCode xhci_address_slot(XHCIState *xhci, unsigned int slotid,
         slot_ctx[3] = SLOT_DEFAULT << SLOT_STATE_SHIFT;
     } else {
         USBPacket p;
-        slot->devaddr = xhci->devaddr++;
-        slot_ctx[3] = (SLOT_ADDRESSED << SLOT_STATE_SHIFT) | slot->devaddr;
-        DPRINTF("xhci: device address is %d\n", slot->devaddr);
+        uint8_t buf[1];
+
+        slot_ctx[3] = (SLOT_ADDRESSED << SLOT_STATE_SHIFT) | slotid;
         usb_device_reset(dev);
+        memset(&p, 0, sizeof(p));
+        usb_packet_addbuf(&p, buf, sizeof(buf));
         usb_packet_setup(&p, USB_TOKEN_OUT,
                          usb_ep_get(dev, USB_TOKEN_OUT, 0), 0,
                          0, false, false);
         usb_device_handle_control(dev, &p,
                                   DeviceOutRequest | USB_REQ_SET_ADDRESS,
-                                  slot->devaddr, 0, 0, NULL);
+                                  slotid, 0, 0, NULL);
         assert(p.status != USB_RET_ASYNC);
     }
 
@@ -2526,7 +2526,6 @@ static void xhci_process_commands(XHCIState *xhci)
             }
             break;
         case CR_SET_TR_DEQUEUE:
-            fprintf(stderr, "%s: CR_SET_TR_DEQUEUE\n", __func__);
             slotid = xhci_get_slot(xhci, &event, &trb);
             if (slotid) {
                 unsigned int epid = (trb.control >> TRB_CR_EPID_SHIFT)
@@ -2593,6 +2592,7 @@ static void xhci_port_notify(XHCIPort *port, uint32_t bits)
     if ((port->portsc & bits) == bits) {
         return;
     }
+    trace_usb_xhci_port_notify(port->portnr, bits);
     port->portsc |= bits;
     if (!xhci_running(port->xhci)) {
         return;
@@ -2674,7 +2674,6 @@ static void xhci_reset(DeviceState *dev)
     xhci->dcbaap_low = 0;
     xhci->dcbaap_high = 0;
     xhci->config = 0;
-    xhci->devaddr = 2;
 
     for (i = 0; i < xhci->numslots; i++) {
         xhci_disable_slot(xhci, i+1);
@@ -2799,29 +2798,56 @@ static void xhci_port_write(void *ptr, hwaddr reg,
                             uint64_t val, unsigned size)
 {
     XHCIPort *port = ptr;
-    uint32_t portsc;
+    uint32_t portsc, notify;
 
     trace_usb_xhci_port_write(port->portnr, reg, val);
 
     switch (reg) {
     case 0x00: /* PORTSC */
+        /* write-1-to-start bits */
+        if (val & PORTSC_PR) {
+            xhci_port_reset(port);
+            break;
+        }
+
         portsc = port->portsc;
+        notify = 0;
         /* write-1-to-clear bits*/
         portsc &= ~(val & (PORTSC_CSC|PORTSC_PEC|PORTSC_WRC|PORTSC_OCC|
                            PORTSC_PRC|PORTSC_PLC|PORTSC_CEC));
         if (val & PORTSC_LWS) {
             /* overwrite PLS only when LWS=1 */
-            uint32_t pls = get_field(val, PORTSC_PLS);
-            set_field(&portsc, pls, PORTSC_PLS);
-            trace_usb_xhci_port_link(port->portnr, pls);
+            uint32_t old_pls = get_field(port->portsc, PORTSC_PLS);
+            uint32_t new_pls = get_field(val, PORTSC_PLS);
+            switch (new_pls) {
+            case PLS_U0:
+                if (old_pls != PLS_U0) {
+                    set_field(&portsc, new_pls, PORTSC_PLS);
+                    trace_usb_xhci_port_link(port->portnr, new_pls);
+                    notify = PORTSC_PLC;
+                }
+                break;
+            case PLS_U3:
+                if (old_pls < PLS_U3) {
+                    set_field(&portsc, new_pls, PORTSC_PLS);
+                    trace_usb_xhci_port_link(port->portnr, new_pls);
+                }
+                break;
+            case PLS_RESUME:
+                /* windows does this for some reason, don't spam stderr */
+                break;
+            default:
+                fprintf(stderr, "%s: ignore pls write (old %d, new %d)\n",
+                        __func__, old_pls, new_pls);
+                break;
+            }
         }
         /* read/write bits */
         portsc &= ~(PORTSC_PP|PORTSC_WCE|PORTSC_WDE|PORTSC_WOE);
         portsc |= (val & (PORTSC_PP|PORTSC_WCE|PORTSC_WDE|PORTSC_WOE));
         port->portsc = portsc;
-        /* write-1-to-start bits */
-        if (val & PORTSC_PR) {
-            xhci_port_reset(port);
+        if (notify) {
+            xhci_port_notify(port, notify);
         }
         break;
     case 0x04: /* PORTPMSC */
@@ -3080,8 +3106,15 @@ static void xhci_doorbell_write(void *ptr, hwaddr reg,
     }
 }
 
+static void xhci_cap_write(void *opaque, hwaddr addr, uint64_t val,
+                           unsigned width)
+{
+    /* nothing */
+}
+
 static const MemoryRegionOps xhci_cap_ops = {
     .read = xhci_cap_read,
+    .write = xhci_cap_write,
     .valid.min_access_size = 1,
     .valid.max_access_size = 4,
     .impl.min_access_size = 4,
@@ -3178,20 +3211,6 @@ static USBPortOps xhci_uport_ops = {
     .child_detach = xhci_child_detach,
 };
 
-static int xhci_find_slotid(XHCIState *xhci, USBDevice *dev)
-{
-    XHCISlot *slot;
-    int slotid;
-
-    for (slotid = 1; slotid <= xhci->numslots; slotid++) {
-        slot = &xhci->slots[slotid-1];
-        if (slot->devaddr == dev->addr) {
-            return slotid;
-        }
-    }
-    return 0;
-}
-
 static int xhci_find_epid(USBEndpoint *ep)
 {
     if (ep->nr == 0) {
@@ -3211,7 +3230,7 @@ static void xhci_wakeup_endpoint(USBBus *bus, USBEndpoint *ep,
     int slotid;
 
     DPRINTF("%s\n", __func__);
-    slotid = xhci_find_slotid(xhci, ep->dev);
+    slotid = ep->dev->addr;
     if (slotid == 0 || !xhci->slots[slotid-1].enabled) {
         DPRINTF("%s: oops, no slot for dev %d\n", __func__, ep->dev->addr);
         return;
diff --git a/hw/usb/host-libusb.c b/hw/usb/host-libusb.c
new file mode 100644
index 0000000..29f35b3
--- /dev/null
+++ b/hw/usb/host-libusb.c
@@ -0,0 +1,1449 @@
+/*
+ * Linux host USB redirector
+ *
+ * Copyright (c) 2005 Fabrice Bellard
+ *
+ * Copyright (c) 2008 Max Krasnyansky
+ *      Support for host device auto connect & disconnect
+ *      Major rewrite to support fully async operation
+ *
+ * Copyright 2008 TJ <linux@tjworld.net>
+ *      Added flexible support for /dev/bus/usb /sys/bus/usb/devices in addition
+ *      to the legacy /proc/bus/usb USB device discovery and handling
+ *
+ * (c) 2012 Gerd Hoffmann <kraxel@redhat.com>
+ *      Completely rewritten to use libusb instead of usbfs ioctls.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <poll.h>
+#include <libusb.h>
+
+#include "qemu-common.h"
+#include "monitor/monitor.h"
+#include "sysemu/sysemu.h"
+#include "trace.h"
+
+#include "hw/usb.h"
+
+/* ------------------------------------------------------------------------ */
+
+#define TYPE_USB_HOST_DEVICE "usb-host"
+#define USB_HOST_DEVICE(obj) \
+     OBJECT_CHECK(USBHostDevice, (obj), TYPE_USB_HOST_DEVICE)
+
+typedef struct USBHostDevice USBHostDevice;
+typedef struct USBHostRequest USBHostRequest;
+typedef struct USBHostIsoXfer USBHostIsoXfer;
+typedef struct USBHostIsoRing USBHostIsoRing;
+
+struct USBAutoFilter {
+    uint32_t bus_num;
+    uint32_t addr;
+    char     *port;
+    uint32_t vendor_id;
+    uint32_t product_id;
+};
+
+enum USBHostDeviceOptions {
+    USB_HOST_OPT_PIPELINE,
+};
+
+struct USBHostDevice {
+    USBDevice parent_obj;
+
+    /* properties */
+    struct USBAutoFilter             match;
+    int32_t                          bootindex;
+    uint32_t                         iso_urb_count;
+    uint32_t                         iso_urb_frames;
+    uint32_t                         options;
+    uint32_t                         loglevel;
+
+    /* state */
+    QTAILQ_ENTRY(USBHostDevice)      next;
+    int                              seen, errcount;
+    int                              bus_num;
+    int                              addr;
+    char                             port[16];
+
+    libusb_device                    *dev;
+    libusb_device_handle             *dh;
+    struct libusb_device_descriptor  ddesc;
+
+    struct {
+        bool                         detached;
+        bool                         claimed;
+    } ifs[USB_MAX_INTERFACES];
+
+    /* callbacks & friends */
+    QEMUBH                           *bh;
+    Notifier                         exit;
+
+    /* request queues */
+    QTAILQ_HEAD(, USBHostRequest)    requests;
+    QTAILQ_HEAD(, USBHostIsoRing)    isorings;
+};
+
+struct USBHostRequest {
+    USBHostDevice                    *host;
+    USBPacket                        *p;
+    bool                             in;
+    struct libusb_transfer           *xfer;
+    unsigned char                    *buffer;
+    unsigned char                    *cbuf;
+    unsigned int                     clen;
+    QTAILQ_ENTRY(USBHostRequest)     next;
+};
+
+struct USBHostIsoXfer {
+    USBHostIsoRing                   *ring;
+    struct libusb_transfer           *xfer;
+    bool                             copy_complete;
+    unsigned int                     packet;
+    QTAILQ_ENTRY(USBHostIsoXfer)     next;
+};
+
+struct USBHostIsoRing {
+    USBHostDevice                    *host;
+    USBEndpoint                      *ep;
+    QTAILQ_HEAD(, USBHostIsoXfer)    unused;
+    QTAILQ_HEAD(, USBHostIsoXfer)    inflight;
+    QTAILQ_HEAD(, USBHostIsoXfer)    copy;
+    QTAILQ_ENTRY(USBHostIsoRing)     next;
+};
+
+static QTAILQ_HEAD(, USBHostDevice) hostdevs =
+    QTAILQ_HEAD_INITIALIZER(hostdevs);
+
+static void usb_host_auto_check(void *unused);
+static void usb_host_release_interfaces(USBHostDevice *s);
+static void usb_host_nodev(USBHostDevice *s);
+static void usb_host_attach_kernel(USBHostDevice *s);
+
+/* ------------------------------------------------------------------------ */
+
+#define CONTROL_TIMEOUT  10000        /* 10 sec    */
+#define BULK_TIMEOUT         0        /* unlimited */
+#define INTR_TIMEOUT         0        /* unlimited */
+
+static const char *speed_name[] = {
+    [LIBUSB_SPEED_UNKNOWN] = "?",
+    [LIBUSB_SPEED_LOW]     = "1.5",
+    [LIBUSB_SPEED_FULL]    = "12",
+    [LIBUSB_SPEED_HIGH]    = "480",
+    [LIBUSB_SPEED_SUPER]   = "5000",
+};
+
+static const unsigned int speed_map[] = {
+    [LIBUSB_SPEED_LOW]     = USB_SPEED_LOW,
+    [LIBUSB_SPEED_FULL]    = USB_SPEED_FULL,
+    [LIBUSB_SPEED_HIGH]    = USB_SPEED_HIGH,
+    [LIBUSB_SPEED_SUPER]   = USB_SPEED_SUPER,
+};
+
+static const unsigned int status_map[] = {
+    [LIBUSB_TRANSFER_COMPLETED] = USB_RET_SUCCESS,
+    [LIBUSB_TRANSFER_ERROR]     = USB_RET_IOERROR,
+    [LIBUSB_TRANSFER_TIMED_OUT] = USB_RET_IOERROR,
+    [LIBUSB_TRANSFER_CANCELLED] = USB_RET_IOERROR,
+    [LIBUSB_TRANSFER_STALL]     = USB_RET_STALL,
+    [LIBUSB_TRANSFER_NO_DEVICE] = USB_RET_NODEV,
+    [LIBUSB_TRANSFER_OVERFLOW]  = USB_RET_BABBLE,
+};
+
+static const char *err_names[] = {
+    [-LIBUSB_ERROR_IO]               = "IO",
+    [-LIBUSB_ERROR_INVALID_PARAM]    = "INVALID_PARAM",
+    [-LIBUSB_ERROR_ACCESS]           = "ACCESS",
+    [-LIBUSB_ERROR_NO_DEVICE]        = "NO_DEVICE",
+    [-LIBUSB_ERROR_NOT_FOUND]        = "NOT_FOUND",
+    [-LIBUSB_ERROR_BUSY]             = "BUSY",
+    [-LIBUSB_ERROR_TIMEOUT]          = "TIMEOUT",
+    [-LIBUSB_ERROR_OVERFLOW]         = "OVERFLOW",
+    [-LIBUSB_ERROR_PIPE]             = "PIPE",
+    [-LIBUSB_ERROR_INTERRUPTED]      = "INTERRUPTED",
+    [-LIBUSB_ERROR_NO_MEM]           = "NO_MEM",
+    [-LIBUSB_ERROR_NOT_SUPPORTED]    = "NOT_SUPPORTED",
+    [-LIBUSB_ERROR_OTHER]            = "OTHER",
+};
+
+static libusb_context *ctx;
+static uint32_t loglevel;
+
+static void usb_host_handle_fd(void *opaque)
+{
+    struct timeval tv = { 0, 0 };
+    libusb_handle_events_timeout(ctx, &tv);
+}
+
+static void usb_host_add_fd(int fd, short events, void *user_data)
+{
+    qemu_set_fd_handler(fd,
+                        (events & POLLIN)  ? usb_host_handle_fd : NULL,
+                        (events & POLLOUT) ? usb_host_handle_fd : NULL,
+                        ctx);
+}
+
+static void usb_host_del_fd(int fd, void *user_data)
+{
+    qemu_set_fd_handler(fd, NULL, NULL, NULL);
+}
+
+static int usb_host_init(void)
+{
+    const struct libusb_pollfd **poll;
+    int i, rc;
+
+    if (ctx) {
+        return 0;
+    }
+    rc = libusb_init(&ctx);
+    if (rc != 0) {
+        return -1;
+    }
+    libusb_set_debug(ctx, loglevel);
+
+    libusb_set_pollfd_notifiers(ctx, usb_host_add_fd,
+                                usb_host_del_fd,
+                                ctx);
+    poll = libusb_get_pollfds(ctx);
+    if (poll) {
+        for (i = 0; poll[i] != NULL; i++) {
+            usb_host_add_fd(poll[i]->fd, poll[i]->events, ctx);
+        }
+    }
+    free(poll);
+    return 0;
+}
+
+static int usb_host_get_port(libusb_device *dev, char *port, size_t len)
+{
+#if defined(LIBUSBX_API_VERSION) && (LIBUSBX_API_VERSION >= 0x010000ff)
+    /* have libusb_get_port_path() */
+    uint8_t path[7];
+    size_t off;
+    int rc, i;
+
+    rc = libusb_get_port_path(ctx, dev, path, 7);
+    if (rc < 0) {
+        return 0;
+    }
+    off = snprintf(port, len, "%d", path[0]);
+    for (i = 1; i < rc; i++) {
+        off += snprintf(port+off, len-off, ".%d", path[i]);
+    }
+    return off;
+#else
+    return snprintf(port, len, "FIXME");
+#endif
+}
+
+static void usb_host_libusb_error(const char *func, int rc)
+{
+    const char *errname;
+
+    if (rc >= 0) {
+        return;
+    }
+
+    if (-rc < ARRAY_SIZE(err_names) && err_names[-rc]) {
+        errname = err_names[-rc];
+    } else {
+        errname = "?";
+    }
+    fprintf(stderr, "%s: %d [%s]\n", func, rc, errname);
+}
+
+/* ------------------------------------------------------------------------ */
+
+static bool usb_host_use_combining(USBEndpoint *ep)
+{
+    int type;
+
+    if (!ep->pipeline) {
+        return false;
+    }
+    if (ep->pid != USB_TOKEN_IN) {
+        return false;
+    }
+    type = usb_ep_get_type(ep->dev, ep->pid, ep->nr);
+    if (type != USB_ENDPOINT_XFER_BULK) {
+        return false;
+    }
+    return true;
+}
+
+/* ------------------------------------------------------------------------ */
+
+static USBHostRequest *usb_host_req_alloc(USBHostDevice *s, USBPacket *p,
+                                          bool in, size_t bufsize)
+{
+    USBHostRequest *r = g_new0(USBHostRequest, 1);
+
+    r->host = s;
+    r->p = p;
+    r->in = in;
+    r->xfer = libusb_alloc_transfer(0);
+    if (bufsize) {
+        r->buffer = g_malloc(bufsize);
+    }
+    QTAILQ_INSERT_TAIL(&s->requests, r, next);
+    return r;
+}
+
+static void usb_host_req_free(USBHostRequest *r)
+{
+    if (r->host) {
+        QTAILQ_REMOVE(&r->host->requests, r, next);
+    }
+    libusb_free_transfer(r->xfer);
+    g_free(r->buffer);
+    g_free(r);
+}
+
+static USBHostRequest *usb_host_req_find(USBHostDevice *s, USBPacket *p)
+{
+    USBHostRequest *r;
+
+    QTAILQ_FOREACH(r, &s->requests, next) {
+        if (r->p == p) {
+            return r;
+        }
+    }
+    return NULL;
+}
+
+static void usb_host_req_complete_ctrl(struct libusb_transfer *xfer)
+{
+    USBHostRequest *r = xfer->user_data;
+    USBHostDevice  *s = r->host;
+    bool disconnect = (xfer->status == LIBUSB_TRANSFER_NO_DEVICE);
+
+    if (r->p == NULL) {
+        goto out; /* request was canceled */
+    }
+
+    r->p->status = status_map[xfer->status];
+    r->p->actual_length = xfer->actual_length;
+    if (r->in && xfer->actual_length) {
+        memcpy(r->cbuf, r->buffer + 8, xfer->actual_length);
+    }
+    trace_usb_host_req_complete(s->bus_num, s->addr, r->p,
+                                r->p->status, r->p->actual_length);
+    usb_generic_async_ctrl_complete(USB_DEVICE(s), r->p);
+
+out:
+    usb_host_req_free(r);
+    if (disconnect) {
+        usb_host_nodev(s);
+    }
+}
+
+static void usb_host_req_complete_data(struct libusb_transfer *xfer)
+{
+    USBHostRequest *r = xfer->user_data;
+    USBHostDevice  *s = r->host;
+    bool disconnect = (xfer->status == LIBUSB_TRANSFER_NO_DEVICE);
+
+    if (r->p == NULL) {
+        goto out; /* request was canceled */
+    }
+
+    r->p->status = status_map[xfer->status];
+    if (r->in && xfer->actual_length) {
+        usb_packet_copy(r->p, r->buffer, xfer->actual_length);
+    }
+    trace_usb_host_req_complete(s->bus_num, s->addr, r->p,
+                                r->p->status, r->p->actual_length);
+    if (usb_host_use_combining(r->p->ep)) {
+        usb_combined_input_packet_complete(USB_DEVICE(s), r->p);
+    } else {
+        usb_packet_complete(USB_DEVICE(s), r->p);
+    }
+
+out:
+    usb_host_req_free(r);
+    if (disconnect) {
+        usb_host_nodev(s);
+    }
+}
+
+static void usb_host_req_abort(USBHostRequest *r)
+{
+    USBHostDevice  *s = r->host;
+    bool inflight = (r->p && r->p->state == USB_RET_ASYNC);
+
+    if (inflight) {
+        r->p->status = USB_RET_NODEV;
+        trace_usb_host_req_complete(s->bus_num, s->addr, r->p,
+                                    r->p->status, r->p->actual_length);
+        if (r->p->ep->nr == 0) {
+            usb_generic_async_ctrl_complete(USB_DEVICE(s), r->p);
+        } else {
+            usb_packet_complete(USB_DEVICE(s), r->p);
+        }
+        r->p = NULL;
+    }
+
+    QTAILQ_REMOVE(&r->host->requests, r, next);
+    r->host = NULL;
+
+    if (inflight) {
+        libusb_cancel_transfer(r->xfer);
+    }
+}
+
+/* ------------------------------------------------------------------------ */
+
+static void usb_host_req_complete_iso(struct libusb_transfer *transfer)
+{
+    USBHostIsoXfer *xfer = transfer->user_data;
+
+    if (!xfer) {
+        /* USBHostIsoXfer released while inflight */
+        g_free(transfer->buffer);
+        libusb_free_transfer(transfer);
+        return;
+    }
+
+    QTAILQ_REMOVE(&xfer->ring->inflight, xfer, next);
+    if (QTAILQ_EMPTY(&xfer->ring->inflight)) {
+        USBHostDevice *s = xfer->ring->host;
+        trace_usb_host_iso_stop(s->bus_num, s->addr, xfer->ring->ep->nr);
+    }
+    if (xfer->ring->ep->pid == USB_TOKEN_IN) {
+        QTAILQ_INSERT_TAIL(&xfer->ring->copy, xfer, next);
+    } else {
+        QTAILQ_INSERT_TAIL(&xfer->ring->unused, xfer, next);
+    }
+}
+
+static USBHostIsoRing *usb_host_iso_alloc(USBHostDevice *s, USBEndpoint *ep)
+{
+    USBHostIsoRing *ring = g_new0(USBHostIsoRing, 1);
+    USBHostIsoXfer *xfer;
+    /* FIXME: check interval (for now assume one xfer per frame) */
+    int packets = s->iso_urb_frames;
+    int i;
+
+    ring->host = s;
+    ring->ep = ep;
+    QTAILQ_INIT(&ring->unused);
+    QTAILQ_INIT(&ring->inflight);
+    QTAILQ_INIT(&ring->copy);
+    QTAILQ_INSERT_TAIL(&s->isorings, ring, next);
+
+    for (i = 0; i < s->iso_urb_count; i++) {
+        xfer = g_new0(USBHostIsoXfer, 1);
+        xfer->ring = ring;
+        xfer->xfer = libusb_alloc_transfer(packets);
+        xfer->xfer->dev_handle = s->dh;
+        xfer->xfer->type = LIBUSB_TRANSFER_TYPE_ISOCHRONOUS;
+
+        xfer->xfer->endpoint = ring->ep->nr;
+        if (ring->ep->pid == USB_TOKEN_IN) {
+            xfer->xfer->endpoint |= USB_DIR_IN;
+        }
+        xfer->xfer->callback = usb_host_req_complete_iso;
+        xfer->xfer->user_data = xfer;
+
+        xfer->xfer->num_iso_packets = packets;
+        xfer->xfer->length = ring->ep->max_packet_size * packets;
+        xfer->xfer->buffer = g_malloc0(xfer->xfer->length);
+
+        QTAILQ_INSERT_TAIL(&ring->unused, xfer, next);
+    }
+
+    return ring;
+}
+
+static USBHostIsoRing *usb_host_iso_find(USBHostDevice *s, USBEndpoint *ep)
+{
+    USBHostIsoRing *ring;
+
+    QTAILQ_FOREACH(ring, &s->isorings, next) {
+        if (ring->ep == ep) {
+            return ring;
+        }
+    }
+    return NULL;
+}
+
+static void usb_host_iso_reset_xfer(USBHostIsoXfer *xfer)
+{
+    libusb_set_iso_packet_lengths(xfer->xfer,
+                                  xfer->ring->ep->max_packet_size);
+    xfer->packet = 0;
+    xfer->copy_complete = false;
+}
+
+static void usb_host_iso_free_xfer(USBHostIsoXfer *xfer, bool inflight)
+{
+    if (inflight) {
+        xfer->xfer->user_data = NULL;
+    } else {
+        g_free(xfer->xfer->buffer);
+        libusb_free_transfer(xfer->xfer);
+    }
+    g_free(xfer);
+}
+
+static void usb_host_iso_free(USBHostIsoRing *ring)
+{
+    USBHostIsoXfer *xfer;
+
+    while ((xfer = QTAILQ_FIRST(&ring->inflight)) != NULL) {
+        QTAILQ_REMOVE(&ring->inflight, xfer, next);
+        usb_host_iso_free_xfer(xfer, true);
+    }
+    while ((xfer = QTAILQ_FIRST(&ring->unused)) != NULL) {
+        QTAILQ_REMOVE(&ring->unused, xfer, next);
+        usb_host_iso_free_xfer(xfer, false);
+    }
+    while ((xfer = QTAILQ_FIRST(&ring->copy)) != NULL) {
+        QTAILQ_REMOVE(&ring->copy, xfer, next);
+        usb_host_iso_free_xfer(xfer, false);
+    }
+
+    QTAILQ_REMOVE(&ring->host->isorings, ring, next);
+    g_free(ring);
+}
+
+static void usb_host_iso_free_all(USBHostDevice *s)
+{
+    USBHostIsoRing *ring;
+
+    while ((ring = QTAILQ_FIRST(&s->isorings)) != NULL) {
+        usb_host_iso_free(ring);
+    }
+}
+
+static bool usb_host_iso_data_copy(USBHostIsoXfer *xfer, USBPacket *p)
+{
+    unsigned int psize;
+    unsigned char *buf;
+
+    buf = libusb_get_iso_packet_buffer_simple(xfer->xfer, xfer->packet);
+    if (p->pid == USB_TOKEN_OUT) {
+        psize = p->iov.size;
+        if (psize > xfer->ring->ep->max_packet_size) {
+            /* should not happen (guest bug) */
+            psize = xfer->ring->ep->max_packet_size;
+        }
+        xfer->xfer->iso_packet_desc[xfer->packet].length = psize;
+    } else {
+        psize = xfer->xfer->iso_packet_desc[xfer->packet].actual_length;
+        if (psize > p->iov.size) {
+            /* should not happen (guest bug) */
+            psize = p->iov.size;
+        }
+    }
+    usb_packet_copy(p, buf, psize);
+    xfer->packet++;
+    xfer->copy_complete = (xfer->packet == xfer->xfer->num_iso_packets);
+    return xfer->copy_complete;
+}
+
+static void usb_host_iso_data_in(USBHostDevice *s, USBPacket *p)
+{
+    USBHostIsoRing *ring;
+    USBHostIsoXfer *xfer;
+    bool disconnect = false;
+    int rc;
+
+    ring = usb_host_iso_find(s, p->ep);
+    if (ring == NULL) {
+        ring = usb_host_iso_alloc(s, p->ep);
+    }
+
+    /* copy data to guest */
+    xfer = QTAILQ_FIRST(&ring->copy);
+    if (xfer != NULL) {
+        if (usb_host_iso_data_copy(xfer, p)) {
+            QTAILQ_REMOVE(&ring->copy, xfer, next);
+            QTAILQ_INSERT_TAIL(&ring->unused, xfer, next);
+        }
+    }
+
+    /* submit empty bufs to host */
+    while ((xfer = QTAILQ_FIRST(&ring->unused)) != NULL) {
+        QTAILQ_REMOVE(&ring->unused, xfer, next);
+        usb_host_iso_reset_xfer(xfer);
+        rc = libusb_submit_transfer(xfer->xfer);
+        if (rc != 0) {
+            usb_host_libusb_error("libusb_submit_transfer [iso]", rc);
+            QTAILQ_INSERT_TAIL(&ring->unused, xfer, next);
+            if (rc == LIBUSB_ERROR_NO_DEVICE) {
+                disconnect = true;
+            }
+            break;
+        }
+        if (QTAILQ_EMPTY(&ring->inflight)) {
+            trace_usb_host_iso_start(s->bus_num, s->addr, p->ep->nr);
+        }
+        QTAILQ_INSERT_TAIL(&ring->inflight, xfer, next);
+    }
+
+    if (disconnect) {
+        usb_host_nodev(s);
+    }
+}
+
+static void usb_host_iso_data_out(USBHostDevice *s, USBPacket *p)
+{
+    USBHostIsoRing *ring;
+    USBHostIsoXfer *xfer;
+    bool disconnect = false;
+    int rc, filled = 0;
+
+    ring = usb_host_iso_find(s, p->ep);
+    if (ring == NULL) {
+        ring = usb_host_iso_alloc(s, p->ep);
+    }
+
+    /* copy data from guest */
+    xfer = QTAILQ_FIRST(&ring->copy);
+    while (xfer != NULL && xfer->copy_complete) {
+        filled++;
+        xfer = QTAILQ_NEXT(xfer, next);
+    }
+    if (xfer == NULL) {
+        xfer = QTAILQ_FIRST(&ring->unused);
+        if (xfer == NULL) {
+            trace_usb_host_iso_out_of_bufs(s->bus_num, s->addr, p->ep->nr);
+            return;
+        }
+        QTAILQ_REMOVE(&ring->unused, xfer, next);
+        usb_host_iso_reset_xfer(xfer);
+        QTAILQ_INSERT_TAIL(&ring->copy, xfer, next);
+    }
+    usb_host_iso_data_copy(xfer, p);
+
+    if (QTAILQ_EMPTY(&ring->inflight)) {
+        /* wait until half of our buffers are filled
+           before kicking the iso out stream */
+        if (filled*2 < s->iso_urb_count) {
+            return;
+        }
+    }
+
+    /* submit filled bufs to host */
+    while ((xfer = QTAILQ_FIRST(&ring->copy)) != NULL &&
+           xfer->copy_complete) {
+        QTAILQ_REMOVE(&ring->copy, xfer, next);
+        rc = libusb_submit_transfer(xfer->xfer);
+        if (rc != 0) {
+            usb_host_libusb_error("libusb_submit_transfer [iso]", rc);
+            QTAILQ_INSERT_TAIL(&ring->unused, xfer, next);
+            if (rc == LIBUSB_ERROR_NO_DEVICE) {
+                disconnect = true;
+            }
+            break;
+        }
+        if (QTAILQ_EMPTY(&ring->inflight)) {
+            trace_usb_host_iso_start(s->bus_num, s->addr, p->ep->nr);
+        }
+        QTAILQ_INSERT_TAIL(&ring->inflight, xfer, next);
+    }
+
+    if (disconnect) {
+        usb_host_nodev(s);
+    }
+}
+
+/* ------------------------------------------------------------------------ */
+
+static void usb_host_ep_update(USBHostDevice *s)
+{
+    static const char *tname[] = {
+        [USB_ENDPOINT_XFER_CONTROL] = "control",
+        [USB_ENDPOINT_XFER_ISOC]    = "isoc",
+        [USB_ENDPOINT_XFER_BULK]    = "bulk",
+        [USB_ENDPOINT_XFER_INT]     = "int",
+    };
+    USBDevice *udev = USB_DEVICE(s);
+    struct libusb_config_descriptor *conf;
+    const struct libusb_interface_descriptor *intf;
+    const struct libusb_endpoint_descriptor *endp;
+    uint8_t devep, type;
+    int pid, ep;
+    int rc, i, e;
+
+    usb_ep_reset(udev);
+    rc = libusb_get_active_config_descriptor(s->dev, &conf);
+    if (rc != 0) {
+        return;
+    }
+    trace_usb_host_parse_config(s->bus_num, s->addr,
+                                conf->bConfigurationValue, true);
+
+    for (i = 0; i < conf->bNumInterfaces; i++) {
+        assert(udev->altsetting[i] < conf->interface[i].num_altsetting);
+        intf = &conf->interface[i].altsetting[udev->altsetting[i]];
+        trace_usb_host_parse_interface(s->bus_num, s->addr,
+                                       intf->bInterfaceNumber,
+                                       intf->bAlternateSetting, true);
+        for (e = 0; e < intf->bNumEndpoints; e++) {
+            endp = &intf->endpoint[e];
+
+            devep = endp->bEndpointAddress;
+            pid = (devep & USB_DIR_IN) ? USB_TOKEN_IN : USB_TOKEN_OUT;
+            ep = devep & 0xf;
+            type = endp->bmAttributes & 0x3;
+
+            if (ep == 0) {
+                trace_usb_host_parse_error(s->bus_num, s->addr,
+                                           "invalid endpoint address");
+                return;
+            }
+            if (usb_ep_get_type(udev, pid, ep) != USB_ENDPOINT_XFER_INVALID) {
+                trace_usb_host_parse_error(s->bus_num, s->addr,
+                                           "duplicate endpoint address");
+                return;
+            }
+
+            trace_usb_host_parse_endpoint(s->bus_num, s->addr, ep,
+                                          (devep & USB_DIR_IN) ? "in" : "out",
+                                          tname[type], true);
+            usb_ep_set_max_packet_size(udev, pid, ep,
+                                       endp->wMaxPacketSize);
+            usb_ep_set_type(udev, pid, ep, type);
+            usb_ep_set_ifnum(udev, pid, ep, i);
+            usb_ep_set_halted(udev, pid, ep, 0);
+        }
+    }
+
+    libusb_free_config_descriptor(conf);
+}
+
+static int usb_host_open(USBHostDevice *s, libusb_device *dev)
+{
+    USBDevice *udev = USB_DEVICE(s);
+    int bus_num = libusb_get_bus_number(dev);
+    int addr    = libusb_get_device_address(dev);
+    int rc;
+
+    trace_usb_host_open_started(bus_num, addr);
+
+    if (s->dh != NULL) {
+        goto fail;
+    }
+    rc = libusb_open(dev, &s->dh);
+    if (rc != 0) {
+        goto fail;
+    }
+
+    libusb_get_device_descriptor(dev, &s->ddesc);
+    s->dev     = dev;
+    s->bus_num = bus_num;
+    s->addr    = addr;
+    usb_host_get_port(s->dev, s->port, sizeof(s->port));
+
+    usb_ep_init(udev);
+    usb_host_ep_update(s);
+
+    udev->speed     = speed_map[libusb_get_device_speed(dev)];
+    udev->speedmask = (1 << udev->speed);
+#if 0
+    if (udev->speed == USB_SPEED_HIGH && usb_linux_full_speed_compat(dev)) {
+        udev->speedmask |= USB_SPEED_MASK_FULL;
+    }
+#endif
+
+    if (s->ddesc.iProduct) {
+        libusb_get_string_descriptor_ascii(s->dh, s->ddesc.iProduct,
+                                           (unsigned char *)udev->product_desc,
+                                           sizeof(udev->product_desc));
+    } else {
+        snprintf(udev->product_desc, sizeof(udev->product_desc),
+                 "host:%d.%d", bus_num, addr);
+    }
+
+    rc = usb_device_attach(udev);
+    if (rc) {
+        goto fail;
+    }
+
+    trace_usb_host_open_success(bus_num, addr);
+    return 0;
+
+fail:
+    trace_usb_host_open_failure(bus_num, addr);
+    if (s->dh != NULL) {
+        libusb_close(s->dh);
+        s->dh = NULL;
+        s->dev = NULL;
+    }
+    return -1;
+}
+
+static void usb_host_abort_xfers(USBHostDevice *s)
+{
+    USBHostRequest *r, *rtmp;
+
+    QTAILQ_FOREACH_SAFE(r, &s->requests, next, rtmp) {
+        usb_host_req_abort(r);
+    }
+}
+
+static int usb_host_close(USBHostDevice *s)
+{
+    USBDevice *udev = USB_DEVICE(s);
+
+    if (s->dh == NULL) {
+        return -1;
+    }
+
+    trace_usb_host_close(s->bus_num, s->addr);
+
+    usb_host_abort_xfers(s);
+    usb_host_iso_free_all(s);
+
+    if (udev->attached) {
+        usb_device_detach(udev);
+    }
+
+    usb_host_release_interfaces(s);
+    libusb_reset_device(s->dh);
+    usb_host_attach_kernel(s);
+    libusb_close(s->dh);
+    s->dh = NULL;
+    s->dev = NULL;
+
+    usb_host_auto_check(NULL);
+    return 0;
+}
+
+static void usb_host_nodev_bh(void *opaque)
+{
+    USBHostDevice *s = opaque;
+    usb_host_close(s);
+}
+
+static void usb_host_nodev(USBHostDevice *s)
+{
+    if (!s->bh) {
+        s->bh = qemu_bh_new(usb_host_nodev_bh, s);
+    }
+    qemu_bh_schedule(s->bh);
+}
+
+static void usb_host_exit_notifier(struct Notifier *n, void *data)
+{
+    USBHostDevice *s = container_of(n, USBHostDevice, exit);
+
+    if (s->dh) {
+        usb_host_release_interfaces(s);
+        usb_host_attach_kernel(s);
+    }
+}
+
+static int usb_host_initfn(USBDevice *udev)
+{
+    USBHostDevice *s = USB_HOST_DEVICE(udev);
+
+    loglevel = s->loglevel;
+    udev->auto_attach = 0;
+    QTAILQ_INIT(&s->requests);
+    QTAILQ_INIT(&s->isorings);
+
+    s->exit.notify = usb_host_exit_notifier;
+    qemu_add_exit_notifier(&s->exit);
+
+    QTAILQ_INSERT_TAIL(&hostdevs, s, next);
+    add_boot_device_path(s->bootindex, &udev->qdev, NULL);
+    usb_host_auto_check(NULL);
+    return 0;
+}
+
+static void usb_host_handle_destroy(USBDevice *udev)
+{
+    USBHostDevice *s = USB_HOST_DEVICE(udev);
+
+    qemu_remove_exit_notifier(&s->exit);
+    QTAILQ_REMOVE(&hostdevs, s, next);
+    usb_host_close(s);
+}
+
+static void usb_host_cancel_packet(USBDevice *udev, USBPacket *p)
+{
+    USBHostDevice *s = USB_HOST_DEVICE(udev);
+    USBHostRequest *r;
+
+    if (p->combined) {
+        usb_combined_packet_cancel(udev, p);
+        return;
+    }
+
+    trace_usb_host_req_canceled(s->bus_num, s->addr, p);
+
+    r = usb_host_req_find(s, p);
+    if (r && r->p) {
+        r->p = NULL; /* mark as dead */
+        libusb_cancel_transfer(r->xfer);
+    }
+}
+
+static void usb_host_detach_kernel(USBHostDevice *s)
+{
+    struct libusb_config_descriptor *conf;
+    int rc, i;
+
+    rc = libusb_get_active_config_descriptor(s->dev, &conf);
+    if (rc != 0) {
+        return;
+    }
+    for (i = 0; i < conf->bNumInterfaces; i++) {
+        rc = libusb_kernel_driver_active(s->dh, i);
+        usb_host_libusb_error("libusb_kernel_driver_active", rc);
+        if (rc != 1) {
+            continue;
+        }
+        trace_usb_host_detach_kernel(s->bus_num, s->addr, i);
+        rc = libusb_detach_kernel_driver(s->dh, i);
+        usb_host_libusb_error("libusb_detach_kernel_driver", rc);
+        s->ifs[i].detached = true;
+    }
+    libusb_free_config_descriptor(conf);
+}
+
+static void usb_host_attach_kernel(USBHostDevice *s)
+{
+    struct libusb_config_descriptor *conf;
+    int rc, i;
+
+    rc = libusb_get_active_config_descriptor(s->dev, &conf);
+    if (rc != 0) {
+        return;
+    }
+    for (i = 0; i < conf->bNumInterfaces; i++) {
+        if (!s->ifs[i].detached) {
+            continue;
+        }
+        trace_usb_host_attach_kernel(s->bus_num, s->addr, i);
+        libusb_attach_kernel_driver(s->dh, i);
+        s->ifs[i].detached = false;
+    }
+    libusb_free_config_descriptor(conf);
+}
+
+static int usb_host_claim_interfaces(USBHostDevice *s, int configuration)
+{
+    USBDevice *udev = USB_DEVICE(s);
+    struct libusb_config_descriptor *conf;
+    int rc, i;
+
+    for (i = 0; i < USB_MAX_INTERFACES; i++) {
+        udev->altsetting[i] = 0;
+    }
+    udev->ninterfaces   = 0;
+    udev->configuration = 0;
+
+    if (configuration == 0) {
+        /* address state - ignore */
+        return USB_RET_SUCCESS;
+    }
+
+    usb_host_detach_kernel(s);
+
+    rc = libusb_get_active_config_descriptor(s->dev, &conf);
+    if (rc != 0) {
+        return USB_RET_STALL;
+    }
+
+    for (i = 0; i < conf->bNumInterfaces; i++) {
+        trace_usb_host_claim_interface(s->bus_num, s->addr, configuration, i);
+        rc = libusb_claim_interface(s->dh, i);
+        usb_host_libusb_error("libusb_claim_interface", rc);
+        if (rc != 0) {
+            return USB_RET_STALL;
+        }
+        s->ifs[i].claimed = true;
+    }
+
+    udev->ninterfaces   = conf->bNumInterfaces;
+    udev->configuration = configuration;
+
+    libusb_free_config_descriptor(conf);
+    return USB_RET_SUCCESS;
+}
+
+static void usb_host_release_interfaces(USBHostDevice *s)
+{
+    USBDevice *udev = USB_DEVICE(s);
+    int i, rc;
+
+    for (i = 0; i < udev->ninterfaces; i++) {
+        if (!s->ifs[i].claimed) {
+            continue;
+        }
+        trace_usb_host_release_interface(s->bus_num, s->addr, i);
+        rc = libusb_release_interface(s->dh, i);
+        usb_host_libusb_error("libusb_release_interface", rc);
+        s->ifs[i].claimed = false;
+    }
+}
+
+static void usb_host_set_address(USBHostDevice *s, int addr)
+{
+    USBDevice *udev = USB_DEVICE(s);
+
+    trace_usb_host_set_address(s->bus_num, s->addr, addr);
+    udev->addr = addr;
+}
+
+static void usb_host_set_config(USBHostDevice *s, int config, USBPacket *p)
+{
+    int rc;
+
+    trace_usb_host_set_config(s->bus_num, s->addr, config);
+
+    usb_host_release_interfaces(s);
+    usb_host_detach_kernel(s);
+    rc = libusb_set_configuration(s->dh, config);
+    if (rc != 0) {
+        usb_host_libusb_error("libusb_set_configuration", rc);
+        p->status = USB_RET_STALL;
+        if (rc == LIBUSB_ERROR_NO_DEVICE) {
+            usb_host_nodev(s);
+        }
+        return;
+    }
+    p->status = usb_host_claim_interfaces(s, config);
+    if (p->status != USB_RET_SUCCESS) {
+        return;
+    }
+    usb_host_ep_update(s);
+}
+
+static void usb_host_set_interface(USBHostDevice *s, int iface, int alt,
+                                   USBPacket *p)
+{
+    USBDevice *udev = USB_DEVICE(s);
+    int rc;
+
+    trace_usb_host_set_interface(s->bus_num, s->addr, iface, alt);
+
+    usb_host_iso_free_all(s);
+
+    if (iface >= USB_MAX_INTERFACES) {
+        p->status = USB_RET_STALL;
+        return;
+    }
+
+    rc = libusb_set_interface_alt_setting(s->dh, iface, alt);
+    if (rc != 0) {
+        usb_host_libusb_error("libusb_set_interface_alt_setting", rc);
+        p->status = USB_RET_STALL;
+        if (rc == LIBUSB_ERROR_NO_DEVICE) {
+            usb_host_nodev(s);
+        }
+        return;
+    }
+
+    udev->altsetting[iface] = alt;
+    usb_host_ep_update(s);
+}
+
+static void usb_host_handle_control(USBDevice *udev, USBPacket *p,
+                                    int request, int value, int index,
+                                    int length, uint8_t *data)
+{
+    USBHostDevice *s = USB_HOST_DEVICE(udev);
+    USBHostRequest *r;
+    int rc;
+
+    trace_usb_host_req_control(s->bus_num, s->addr, p, request, value, index);
+
+    if (s->dh == NULL) {
+        p->status = USB_RET_NODEV;
+        trace_usb_host_req_emulated(s->bus_num, s->addr, p, p->status);
+        return;
+    }
+
+    switch (request) {
+    case DeviceOutRequest | USB_REQ_SET_ADDRESS:
+        usb_host_set_address(s, value);
+        trace_usb_host_req_emulated(s->bus_num, s->addr, p, p->status);
+        return;
+
+    case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
+        usb_host_set_config(s, value & 0xff, p);
+        trace_usb_host_req_emulated(s->bus_num, s->addr, p, p->status);
+        return;
+
+    case InterfaceOutRequest | USB_REQ_SET_INTERFACE:
+        usb_host_set_interface(s, index, value, p);
+        trace_usb_host_req_emulated(s->bus_num, s->addr, p, p->status);
+        return;
+
+    case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
+        if (value == 0) { /* clear halt */
+            int pid = (index & USB_DIR_IN) ? USB_TOKEN_IN : USB_TOKEN_OUT;
+            libusb_clear_halt(s->dh, index);
+            usb_ep_set_halted(udev, pid, index & 0x0f, 0);
+            trace_usb_host_req_emulated(s->bus_num, s->addr, p, p->status);
+            return;
+        }
+    }
+
+    r = usb_host_req_alloc(s, p, (request >> 8) & USB_DIR_IN, length + 8);
+    r->cbuf = data;
+    r->clen = length;
+    memcpy(r->buffer, udev->setup_buf, 8);
+    if (!r->in) {
+        memcpy(r->buffer + 8, r->cbuf, r->clen);
+    }
+
+    libusb_fill_control_transfer(r->xfer, s->dh, r->buffer,
+                                 usb_host_req_complete_ctrl, r,
+                                 CONTROL_TIMEOUT);
+    rc = libusb_submit_transfer(r->xfer);
+    if (rc != 0) {
+        p->status = USB_RET_NODEV;
+        trace_usb_host_req_complete(s->bus_num, s->addr, p,
+                                    p->status, p->actual_length);
+        if (rc == LIBUSB_ERROR_NO_DEVICE) {
+            usb_host_nodev(s);
+        }
+        return;
+    }
+
+    p->status = USB_RET_ASYNC;
+}
+
+static void usb_host_handle_data(USBDevice *udev, USBPacket *p)
+{
+    USBHostDevice *s = USB_HOST_DEVICE(udev);
+    USBHostRequest *r;
+    size_t size;
+    int ep, rc;
+
+    if (usb_host_use_combining(p->ep) && p->state == USB_PACKET_SETUP) {
+        p->status = USB_RET_ADD_TO_QUEUE;
+        return;
+    }
+
+    trace_usb_host_req_data(s->bus_num, s->addr, p,
+                            p->pid == USB_TOKEN_IN,
+                            p->ep->nr, p->iov.size);
+
+    if (s->dh == NULL) {
+        p->status = USB_RET_NODEV;
+        trace_usb_host_req_emulated(s->bus_num, s->addr, p, p->status);
+        return;
+    }
+    if (p->ep->halted) {
+        p->status = USB_RET_STALL;
+        trace_usb_host_req_emulated(s->bus_num, s->addr, p, p->status);
+        return;
+    }
+
+    switch (usb_ep_get_type(udev, p->pid, p->ep->nr)) {
+    case USB_ENDPOINT_XFER_BULK:
+        size = usb_packet_size(p);
+        r = usb_host_req_alloc(s, p, p->pid == USB_TOKEN_IN, size);
+        if (!r->in) {
+            usb_packet_copy(p, r->buffer, size);
+        }
+        ep = p->ep->nr | (r->in ? USB_DIR_IN : 0);
+        libusb_fill_bulk_transfer(r->xfer, s->dh, ep,
+                                  r->buffer, size,
+                                  usb_host_req_complete_data, r,
+                                  BULK_TIMEOUT);
+        break;
+    case USB_ENDPOINT_XFER_INT:
+        r = usb_host_req_alloc(s, p, p->pid == USB_TOKEN_IN, p->iov.size);
+        if (!r->in) {
+            usb_packet_copy(p, r->buffer, p->iov.size);
+        }
+        ep = p->ep->nr | (r->in ? USB_DIR_IN : 0);
+        libusb_fill_interrupt_transfer(r->xfer, s->dh, ep,
+                                       r->buffer, p->iov.size,
+                                       usb_host_req_complete_data, r,
+                                       INTR_TIMEOUT);
+        break;
+    case USB_ENDPOINT_XFER_ISOC:
+        if (p->pid == USB_TOKEN_IN) {
+            usb_host_iso_data_in(s, p);
+        } else {
+            usb_host_iso_data_out(s, p);
+        }
+        trace_usb_host_req_complete(s->bus_num, s->addr, p,
+                                    p->status, p->actual_length);
+        return;
+    default:
+        p->status = USB_RET_STALL;
+        trace_usb_host_req_complete(s->bus_num, s->addr, p,
+                                    p->status, p->actual_length);
+        return;
+    }
+
+    rc = libusb_submit_transfer(r->xfer);
+    if (rc != 0) {
+        p->status = USB_RET_NODEV;
+        trace_usb_host_req_complete(s->bus_num, s->addr, p,
+                                    p->status, p->actual_length);
+        if (rc == LIBUSB_ERROR_NO_DEVICE) {
+            usb_host_nodev(s);
+        }
+        return;
+    }
+
+    p->status = USB_RET_ASYNC;
+}
+
+static void usb_host_flush_ep_queue(USBDevice *dev, USBEndpoint *ep)
+{
+    if (usb_host_use_combining(ep)) {
+        usb_ep_combine_input_packets(ep);
+    }
+}
+
+static void usb_host_handle_reset(USBDevice *udev)
+{
+    USBHostDevice *s = USB_HOST_DEVICE(udev);
+
+    trace_usb_host_reset(s->bus_num, s->addr);
+
+    if (udev->configuration == 0) {
+        return;
+    }
+    usb_host_release_interfaces(s);
+    libusb_reset_device(s->dh);
+    usb_host_claim_interfaces(s, 0);
+    usb_host_ep_update(s);
+}
+
+static const VMStateDescription vmstate_usb_host = {
+    .name = "usb-host",
+    .unmigratable = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_USB_DEVICE(parent_obj, USBHostDevice),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
+static Property usb_host_dev_properties[] = {
+    DEFINE_PROP_UINT32("hostbus",  USBHostDevice, match.bus_num,    0),
+    DEFINE_PROP_UINT32("hostaddr", USBHostDevice, match.addr,       0),
+    DEFINE_PROP_STRING("hostport", USBHostDevice, match.port),
+    DEFINE_PROP_HEX32("vendorid",  USBHostDevice, match.vendor_id,  0),
+    DEFINE_PROP_HEX32("productid", USBHostDevice, match.product_id, 0),
+    DEFINE_PROP_UINT32("isobufs",  USBHostDevice, iso_urb_count,    4),
+    DEFINE_PROP_UINT32("isobsize", USBHostDevice, iso_urb_frames,   32),
+    DEFINE_PROP_INT32("bootindex", USBHostDevice, bootindex,        -1),
+    DEFINE_PROP_UINT32("loglevel",  USBHostDevice, loglevel,
+                       LIBUSB_LOG_LEVEL_WARNING),
+    DEFINE_PROP_BIT("pipeline",    USBHostDevice, options,
+                    USB_HOST_OPT_PIPELINE, true),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void usb_host_class_initfn(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
+
+    uc->init           = usb_host_initfn;
+    uc->product_desc   = "USB Host Device";
+    uc->cancel_packet  = usb_host_cancel_packet;
+    uc->handle_data    = usb_host_handle_data;
+    uc->handle_control = usb_host_handle_control;
+    uc->handle_reset   = usb_host_handle_reset;
+    uc->handle_destroy = usb_host_handle_destroy;
+    uc->flush_ep_queue = usb_host_flush_ep_queue;
+    dc->vmsd = &vmstate_usb_host;
+    dc->props = usb_host_dev_properties;
+}
+
+static TypeInfo usb_host_dev_info = {
+    .name          = TYPE_USB_HOST_DEVICE,
+    .parent        = TYPE_USB_DEVICE,
+    .instance_size = sizeof(USBHostDevice),
+    .class_init    = usb_host_class_initfn,
+};
+
+static void usb_host_register_types(void)
+{
+    type_register_static(&usb_host_dev_info);
+}
+
+type_init(usb_host_register_types)
+
+/* ------------------------------------------------------------------------ */
+
+static QEMUTimer *usb_auto_timer;
+static VMChangeStateEntry *usb_vmstate;
+
+static void usb_host_vm_state(void *unused, int running, RunState state)
+{
+    if (running) {
+        usb_host_auto_check(unused);
+    }
+}
+
+static void usb_host_auto_check(void *unused)
+{
+    struct USBHostDevice *s;
+    struct USBAutoFilter *f;
+    libusb_device **devs;
+    struct libusb_device_descriptor ddesc;
+    int unconnected = 0;
+    int i, n;
+
+    if (usb_host_init() != 0) {
+        return;
+    }
+
+    if (runstate_is_running()) {
+        n = libusb_get_device_list(ctx, &devs);
+        for (i = 0; i < n; i++) {
+            if (libusb_get_device_descriptor(devs[i], &ddesc) != 0) {
+                continue;
+            }
+            if (ddesc.bDeviceClass == LIBUSB_CLASS_HUB) {
+                continue;
+            }
+            QTAILQ_FOREACH(s, &hostdevs, next) {
+                f = &s->match;
+                if (f->bus_num > 0 &&
+                    f->bus_num != libusb_get_bus_number(devs[i])) {
+                    continue;
+                }
+                if (f->addr > 0 &&
+                    f->addr != libusb_get_device_address(devs[i])) {
+                    continue;
+                }
+                if (f->port != NULL) {
+                    char port[16] = "-";
+                    usb_host_get_port(devs[i], port, sizeof(port));
+                    if (strcmp(f->port, port) != 0) {
+                        continue;
+                    }
+                }
+                if (f->vendor_id > 0 &&
+                    f->vendor_id != ddesc.idVendor) {
+                    continue;
+                }
+                if (f->product_id > 0 &&
+                    f->product_id != ddesc.idProduct) {
+                    continue;
+                }
+
+                /* We got a match */
+                s->seen++;
+                if (s->errcount >= 3) {
+                    continue;
+                }
+                if (s->dh != NULL) {
+                    continue;
+                }
+                if (usb_host_open(s, devs[i]) < 0) {
+                    s->errcount++;
+                    continue;
+                }
+                break;
+            }
+        }
+        libusb_free_device_list(devs, 1);
+
+        QTAILQ_FOREACH(s, &hostdevs, next) {
+            if (s->dh == NULL) {
+                unconnected++;
+            }
+            if (s->seen == 0) {
+                if (s->dh) {
+                    usb_host_close(s);
+                }
+                s->errcount = 0;
+            }
+            s->seen = 0;
+        }
+
+#if 0
+        if (unconnected == 0) {
+            /* nothing to watch */
+            if (usb_auto_timer) {
+                qemu_del_timer(usb_auto_timer);
+                trace_usb_host_auto_scan_disabled();
+            }
+            return;
+        }
+#endif
+    }
+
+    if (!usb_vmstate) {
+        usb_vmstate = qemu_add_vm_change_state_handler(usb_host_vm_state, NULL);
+    }
+    if (!usb_auto_timer) {
+        usb_auto_timer = qemu_new_timer_ms(rt_clock, usb_host_auto_check, NULL);
+        if (!usb_auto_timer) {
+            return;
+        }
+        trace_usb_host_auto_scan_enabled();
+    }
+    qemu_mod_timer(usb_auto_timer, qemu_get_clock_ms(rt_clock) + 2000);
+}
+
+void usb_host_info(Monitor *mon, const QDict *qdict)
+{
+    libusb_device **devs;
+    struct libusb_device_descriptor ddesc;
+    char port[16];
+    int i, n;
+
+    if (usb_host_init() != 0) {
+        return;
+    }
+
+    n = libusb_get_device_list(ctx, &devs);
+    for (i = 0; i < n; i++) {
+        if (libusb_get_device_descriptor(devs[i], &ddesc) != 0) {
+            continue;
+        }
+        if (ddesc.bDeviceClass == LIBUSB_CLASS_HUB) {
+            continue;
+        }
+        usb_host_get_port(devs[i], port, sizeof(port));
+        monitor_printf(mon, "  Bus %d, Addr %d, Port %s, Speed %s Mb/s\n",
+                       libusb_get_bus_number(devs[i]),
+                       libusb_get_device_address(devs[i]),
+                       port,
+                       speed_name[libusb_get_device_speed(devs[i])]);
+        monitor_printf(mon, "    Class %02x:", ddesc.bDeviceClass);
+        monitor_printf(mon, " USB device %04x:%04x",
+                       ddesc.idVendor, ddesc.idProduct);
+        if (ddesc.iProduct) {
+            libusb_device_handle *handle;
+            if (libusb_open(devs[i], &handle) == 0) {
+                unsigned char name[64] = "";
+                libusb_get_string_descriptor_ascii(handle,
+                                                   ddesc.iProduct,
+                                                   name, sizeof(name));
+                libusb_close(handle);
+                monitor_printf(mon, ", %s", name);
+            }
+        }
+        monitor_printf(mon, "\n");
+    }
+    libusb_free_device_list(devs, 1);
+}
diff --git a/hw/usb/host-linux.c b/hw/usb/host-linux.c
index b67aeba..8994668 100644
--- a/hw/usb/host-linux.c
+++ b/hw/usb/host-linux.c
@@ -45,6 +45,12 @@
 #include "hw/usb/desc.h"
 #include "hw/usb/host.h"
 
+#ifdef CONFIG_USB_LIBUSB
+# define DEVNAME "usb-host-linux"
+#else
+# define DEVNAME "usb-host"
+#endif
+
 /* We redefine it to avoid version problems */
 struct usb_ctrltransfer {
     uint8_t  bRequestType;
@@ -1487,7 +1493,7 @@ static int usb_host_initfn(USBDevice *dev)
 }
 
 static const VMStateDescription vmstate_usb_host = {
-    .name = "usb-host",
+    .name = DEVNAME,
     .version_id = 1,
     .minimum_version_id = 1,
     .post_load = usb_host_post_load,
@@ -1527,7 +1533,7 @@ static void usb_host_class_initfn(ObjectClass *klass, void *data)
 }
 
 static const TypeInfo usb_host_dev_info = {
-    .name          = "usb-host",
+    .name          = DEVNAME,
     .parent        = TYPE_USB_DEVICE,
     .instance_size = sizeof(USBHostDevice),
     .class_init    = usb_host_class_initfn,
@@ -1767,6 +1773,8 @@ static void usb_host_auto_check(void *unused)
     qemu_mod_timer(usb_auto_timer, qemu_get_clock_ms(rt_clock) + 2000);
 }
 
+#ifndef CONFIG_USB_LIBUSB
+
 /**********************/
 /* USB host device info */
 
@@ -1898,3 +1906,5 @@ void usb_host_info(Monitor *mon, const QDict *qdict)
                        bus, addr, f->port ? f->port : "*", vid, pid);
     }
 }
+
+#endif