[3/3] usb: add usb-bot device (scsi bulk-only transport).

diff --git a/docs/usb-storage.txt b/docs/usb-storage.txt
index e58e849..fa93111 100644
--- a/docs/usb-storage.txt
+++ b/docs/usb-storage.txt
@@ -2,7 +2,7 @@ 
 qemu usb storage emulation
 --------------------------
 
-QEMU has two emulations for usb storage devices.
+QEMU has three devices for usb storage emulation.
 
 Number one emulates the classic bulk-only transport protocol which is
 used by 99% of the usb sticks on the marked today and is called
@@ -31,6 +31,15 @@  with tree logical units:
        -device scsi-cd,bus=uas.0,scsi-id=0,lun=5,drive=uas-cdrom
 
 
+Number three emulates the classic bulk-only transport protocol too.
+It's called "usb-bot".  It shares most code with "usb-storage", and
+the guest will not be able to see the difference.  The qemu command
+line interface is simliar to usb-uas though, i.e. no automatic scsi
+disk creation.  It also features support for up to 16 LUNs.  The LUN
+numbers must be continous, i.e. for three devices you must use 0+1+2.
+The 0+1+5 numbering from the "usb-uas" example isn't going to work
+with "usb-bot".
+
 enjoy,
   Gerd
 
diff --git a/hw/usb/dev-storage.c b/hw/usb/dev-storage.c
index 1b87352..b89d00f 100644
--- a/hw/usb/dev-storage.c
+++ b/hw/usb/dev-storage.c
@@ -54,12 +54,12 @@  typedef struct {
     struct usb_msd_csw csw;
     SCSIRequest *req;
     SCSIBus bus;
+    /* For async completion.  */
+    USBPacket *packet;
+    /* usb-storage only */
     BlockConf conf;
     char *serial;
-    SCSIDevice *scsi_dev;
     uint32_t removable;
-    /* For async completion.  */
-    USBPacket *packet;
 } MSDState;
 
 struct usb_msd_cbw {
@@ -343,7 +343,8 @@  static void usb_msd_handle_control(USBDevice *dev, USBPacket *p,
                int request, int value, int index, int length, uint8_t *data)
 {
     MSDState *s = (MSDState *)dev;
-    int ret;
+    SCSIDevice *scsi_dev;
+    int ret, maxlun;
 
     ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
     if (ret >= 0) {
@@ -359,7 +360,19 @@  static void usb_msd_handle_control(USBDevice *dev, USBPacket *p,
         s->mode = USB_MSDM_CBW;
         break;
     case ClassInterfaceRequest | GetMaxLun:
-        data[0] = 0;
+        maxlun = 0;
+        for (;;) {
+            scsi_dev = scsi_device_find(&s->bus, 0, 0, maxlun+1);
+            if (scsi_dev == NULL) {
+                break;
+            }
+            if (scsi_dev->lun != maxlun+1) {
+                break;
+            }
+            maxlun++;
+        }
+        DPRINTF("MaxLun %d\n", maxlun);
+        data[0] = maxlun;
         p->actual_length = 1;
         break;
     default:
@@ -386,6 +399,7 @@  static void usb_msd_handle_data(USBDevice *dev, USBPacket *p)
     uint32_t tag;
     struct usb_msd_cbw cbw;
     uint8_t devep = p->ep->nr;
+    SCSIDevice *scsi_dev;
 
     switch (p->pid) {
     case USB_TOKEN_OUT:
@@ -405,7 +419,8 @@  static void usb_msd_handle_data(USBDevice *dev, USBPacket *p)
                 goto fail;
             }
             DPRINTF("Command on LUN %d\n", cbw.lun);
-            if (cbw.lun != 0) {
+            scsi_dev = scsi_device_find(&s->bus, 0, 0, cbw.lun);
+            if (scsi_dev == NULL) {
                 fprintf(stderr, "usb-msd: Bad LUN %d\n", cbw.lun);
                 goto fail;
             }
@@ -422,7 +437,7 @@  static void usb_msd_handle_data(USBDevice *dev, USBPacket *p)
                     tag, cbw.flags, cbw.cmd_len, s->data_len);
             assert(le32_to_cpu(s->csw.residue) == 0);
             s->scsi_len = 0;
-            s->req = scsi_req_new(s->scsi_dev, tag, 0, cbw.cmd, NULL);
+            s->req = scsi_req_new(scsi_dev, tag, cbw.lun, cbw.cmd, NULL);
 #ifdef DEBUG_MSD
             scsi_req_print(s->req);
 #endif
@@ -553,7 +568,7 @@  static void *usb_msd_load_request(QEMUFile *f, SCSIRequest *req)
     return NULL;
 }
 
-static const struct SCSIBusInfo usb_msd_scsi_info = {
+static const struct SCSIBusInfo usb_msd_scsi_info_storage = {
     .tcq = false,
     .max_target = 0,
     .max_lun = 0,
@@ -564,10 +579,22 @@  static const struct SCSIBusInfo usb_msd_scsi_info = {
     .load_request = usb_msd_load_request,
 };
 
-static int usb_msd_initfn(USBDevice *dev)
+static const struct SCSIBusInfo usb_msd_scsi_info_bot = {
+    .tcq = false,
+    .max_target = 0,
+    .max_lun = 15,
+
+    .transfer_data = usb_msd_transfer_data,
+    .complete = usb_msd_command_complete,
+    .cancel = usb_msd_request_cancelled,
+    .load_request = usb_msd_load_request,
+};
+
+static int usb_msd_initfn_storage(USBDevice *dev)
 {
     MSDState *s = DO_UPCAST(MSDState, dev, dev);
     BlockDriverState *bs = s->conf.bs;
+    SCSIDevice *scsi_dev;
 
     if (!bs) {
         error_report("drive property not set");
@@ -595,10 +622,10 @@  static int usb_msd_initfn(USBDevice *dev)
     }
 
     usb_desc_init(dev);
-    scsi_bus_new(&s->bus, &s->dev.qdev, &usb_msd_scsi_info);
-    s->scsi_dev = scsi_bus_legacy_add_drive(&s->bus, bs, 0, !!s->removable,
+    scsi_bus_new(&s->bus, &s->dev.qdev, &usb_msd_scsi_info_storage);
+    scsi_dev = scsi_bus_legacy_add_drive(&s->bus, bs, 0, !!s->removable,
                                             s->conf.bootindex);
-    if (!s->scsi_dev) {
+    if (!scsi_dev) {
         return -1;
     }
     s->bus.qbus.allow_hotplug = 0;
@@ -616,6 +643,19 @@  static int usb_msd_initfn(USBDevice *dev)
     return 0;
 }
 
+static int usb_msd_initfn_bot(USBDevice *dev)
+{
+    MSDState *s = DO_UPCAST(MSDState, dev, dev);
+
+    usb_desc_create_serial(dev);
+    usb_desc_init(dev);
+    scsi_bus_new(&s->bus, &s->dev.qdev, &usb_msd_scsi_info_bot);
+    s->bus.qbus.allow_hotplug = 0;
+    usb_msd_handle_reset(dev);
+
+    return 0;
+}
+
 static USBDevice *usb_msd_init(USBBus *bus, const char *filename)
 {
     static int nr=0;
@@ -698,12 +738,11 @@  static Property msd_properties[] = {
     DEFINE_PROP_END_OF_LIST(),
 };
 
-static void usb_msd_class_initfn(ObjectClass *klass, void *data)
+static void usb_msd_class_initfn_common(ObjectClass *klass)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
 
-    uc->init           = usb_msd_initfn;
     uc->product_desc   = "QEMU USB MSD";
     uc->usb_desc       = &desc;
     uc->cancel_packet  = usb_msd_cancel_io;
@@ -713,19 +752,44 @@  static void usb_msd_class_initfn(ObjectClass *klass, void *data)
     uc->handle_data    = usb_msd_handle_data;
     dc->fw_name = "storage";
     dc->vmsd = &vmstate_usb_msd;
+}
+
+static void usb_msd_class_initfn_storage(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
+
+    uc->init = usb_msd_initfn_storage;
     dc->props = msd_properties;
+    usb_msd_class_initfn_common(klass);
+}
+
+static void usb_msd_class_initfn_bot(ObjectClass *klass, void *data)
+{
+    USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
+
+    uc->init = usb_msd_initfn_bot;
+    usb_msd_class_initfn_common(klass);
 }
 
 static const TypeInfo msd_info = {
     .name          = "usb-storage",
     .parent        = TYPE_USB_DEVICE,
     .instance_size = sizeof(MSDState),
-    .class_init    = usb_msd_class_initfn,
+    .class_init    = usb_msd_class_initfn_storage,
+};
+
+static const TypeInfo bot_info = {
+    .name          = "usb-bot",
+    .parent        = TYPE_USB_DEVICE,
+    .instance_size = sizeof(MSDState),
+    .class_init    = usb_msd_class_initfn_bot,
 };
 
 static void usb_msd_register_types(void)
 {
     type_register_static(&msd_info);
+    type_register_static(&bot_info);
     usb_legacy_register("usb-storage", "disk", usb_msd_init);
 }