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From b907cc56cbbb6b979d97aa0c64eb08c1fe7b6f1e Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Mon, 3 Feb 2014 16:30:30 +0100
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Subject: [PATCH 06/28] usb: add support for microsoft os descriptors
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RH-Author: Gerd Hoffmann <kraxel@redhat.com>
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Message-id: <1391445032-5540-4-git-send-email-kraxel@redhat.com>
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Patchwork-id: 57075
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O-Subject: [RHEL-7 qemu-kvm PATCH 3/5] usb: add support for microsoft os descriptors
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Bugzilla: 1039530
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Juan Quintela <quintela@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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This patch adds support for special usb descriptors used by microsoft
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windows.  They allow more fine-grained control over driver binding and
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adding entries to the registry for configuration.
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As this is a guest-visible change the "msos-desc" compat property
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has been added to turn this off for 1.7 + older
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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(cherry picked from commit 5319dc7b42610575cbd3a33f4340c1fb4f19b939)
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Conflicts:
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	hw/i386/pc_piix.c        [ 1.7 compat properties ]
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	include/hw/i386/pc.h     [ likewise              ]
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---
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 hw/usb/Makefile.objs |   2 +-
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 hw/usb/bus.c         |   2 +
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 hw/usb/desc-msos.c   | 234 +++++++++++++++++++++++++++++++++++++++++++++++++++
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 hw/usb/desc.c        |  37 +++++++-
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 hw/usb/desc.h        |  11 ++-
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 include/hw/usb.h     |   3 +
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 trace-events         |   1 +
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 7 files changed, 284 insertions(+), 6 deletions(-)
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 create mode 100644 hw/usb/desc-msos.c
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 hw/usb/Makefile.objs |    2 +-
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 hw/usb/bus.c         |    2 +
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 hw/usb/desc-msos.c   |  234 ++++++++++++++++++++++++++++++++++++++++++++++++++
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 hw/usb/desc.c        |   37 +++++++-
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 hw/usb/desc.h        |   11 ++-
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 include/hw/usb.h     |    3 +
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 trace-events         |    1 +
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 7 files changed, 284 insertions(+), 6 deletions(-)
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 create mode 100644 hw/usb/desc-msos.c
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diff --git a/hw/usb/Makefile.objs b/hw/usb/Makefile.objs
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index a3eac3e..97b4575 100644
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--- a/hw/usb/Makefile.objs
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+++ b/hw/usb/Makefile.objs
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@@ -1,5 +1,5 @@
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 # usb subsystem core
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-common-obj-y += core.o combined-packet.o bus.o desc.o
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+common-obj-y += core.o combined-packet.o bus.o desc.o desc-msos.o
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 common-obj-y += libhw.o
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 # usb host adapters
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diff --git a/hw/usb/bus.c b/hw/usb/bus.c
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index ade9abc..fe6bd13 100644
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--- a/hw/usb/bus.c
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+++ b/hw/usb/bus.c
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@@ -16,6 +16,8 @@ static Property usb_props[] = {
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     DEFINE_PROP_STRING("serial", USBDevice, serial),
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     DEFINE_PROP_BIT("full-path", USBDevice, flags,
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                     USB_DEV_FLAG_FULL_PATH, true),
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+    DEFINE_PROP_BIT("msos-desc", USBDevice, flags,
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+                    USB_DEV_FLAG_MSOS_DESC_ENABLE, true),
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     DEFINE_PROP_END_OF_LIST()
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 };
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diff --git a/hw/usb/desc-msos.c b/hw/usb/desc-msos.c
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new file mode 100644
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index 0000000..ed8d62c
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--- /dev/null
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+++ b/hw/usb/desc-msos.c
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@@ -0,0 +1,234 @@
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+#include "hw/usb.h"
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+#include "hw/usb/desc.h"
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+
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+/*
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+ * Microsoft OS Descriptors
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+ *
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+ * Windows tries to fetch some special descriptors with informations
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+ * specifically for windows.  Presence is indicated using a special
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+ * string @ index 0xee.  There are two kinds of descriptors:
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+ *
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+ * compatid descriptor
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+ *   Used to bind drivers, if usb class isn't specific enougth.
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+ *   Used for PTP/MTP for example (both share the same usb class).
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+ *
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+ * properties descriptor
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+ *   Does carry registry entries.  They show up in
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+ *   HLM\SYSTEM\CurrentControlSet\Enum\USB\<devid>\<serial>\Device Parameters
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+ *
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+ * Note that Windows caches the stuff it got in the registry, so when
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+ * playing with this you have to delete registry subtrees to make
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+ * windows query the device again:
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+ *   HLM\SYSTEM\CurrentControlSet\Control\usbflags
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+ *   HLM\SYSTEM\CurrentControlSet\Enum\USB
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+ * Windows will complain it can't delete entries on the second one.
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+ * It has deleted everything it had permissions too, which is enouth
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+ * as this includes "Device Parameters".
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+ *
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+ * http://msdn.microsoft.com/en-us/library/windows/hardware/ff537430.aspx
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+ *
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+ */
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+
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+/* ------------------------------------------------------------------ */
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+
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+typedef struct msos_compat_hdr {
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+    uint32_t dwLength;
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+    uint8_t  bcdVersion_lo;
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+    uint8_t  bcdVersion_hi;
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+    uint8_t  wIndex_lo;
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+    uint8_t  wIndex_hi;
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+    uint8_t  bCount;
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+    uint8_t  reserved[7];
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+} QEMU_PACKED msos_compat_hdr;
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+
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+typedef struct msos_compat_func {
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+    uint8_t  bFirstInterfaceNumber;
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+    uint8_t  reserved_1;
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+    uint8_t  compatibleId[8];
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+    uint8_t  subCompatibleId[8];
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+    uint8_t  reserved_2[6];
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+} QEMU_PACKED msos_compat_func;
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+
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+static int usb_desc_msos_compat(const USBDesc *desc, uint8_t *dest)
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+{
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+    msos_compat_hdr *hdr = (void *)dest;
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+    msos_compat_func *func;
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+    int length = sizeof(*hdr);
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+    int count = 0;
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+
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+    func = (void *)(dest + length);
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+    func->bFirstInterfaceNumber = 0;
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+    func->reserved_1 = 0x01;
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+    length += sizeof(*func);
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+    count++;
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+
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+    hdr->dwLength      = cpu_to_le32(length);
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+    hdr->bcdVersion_lo = 0x00;
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+    hdr->bcdVersion_hi = 0x01;
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+    hdr->wIndex_lo     = 0x04;
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+    hdr->wIndex_hi     = 0x00;
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+    hdr->bCount        = count;
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+    return length;
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+}
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+
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+/* ------------------------------------------------------------------ */
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+
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+typedef struct msos_prop_hdr {
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+    uint32_t dwLength;
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+    uint8_t  bcdVersion_lo;
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+    uint8_t  bcdVersion_hi;
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+    uint8_t  wIndex_lo;
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+    uint8_t  wIndex_hi;
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+    uint8_t  wCount_lo;
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+    uint8_t  wCount_hi;
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+} QEMU_PACKED msos_prop_hdr;
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+
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+typedef struct msos_prop {
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+    uint32_t dwLength;
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+    uint32_t dwPropertyDataType;
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+    uint8_t  dwPropertyNameLength_lo;
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+    uint8_t  dwPropertyNameLength_hi;
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+    uint8_t  bPropertyName[];
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+} QEMU_PACKED msos_prop;
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+
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+typedef struct msos_prop_data {
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+    uint32_t dwPropertyDataLength;
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+    uint8_t  bPropertyData[];
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+} QEMU_PACKED msos_prop_data;
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+
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+typedef enum msos_prop_type {
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+    MSOS_REG_SZ        = 1,
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+    MSOS_REG_EXPAND_SZ = 2,
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+    MSOS_REG_BINARY    = 3,
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+    MSOS_REG_DWORD_LE  = 4,
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+    MSOS_REG_DWORD_BE  = 5,
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+    MSOS_REG_LINK      = 6,
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+    MSOS_REG_MULTI_SZ  = 7,
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+} msos_prop_type;
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+
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+static int usb_desc_msos_prop_name(struct msos_prop *prop,
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+                                   const wchar_t *name)
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+{
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+    int length = wcslen(name) + 1;
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+    int i;
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+
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+    prop->dwPropertyNameLength_lo = usb_lo(length*2);
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+    prop->dwPropertyNameLength_hi = usb_hi(length*2);
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+    for (i = 0; i < length; i++) {
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+        prop->bPropertyName[i*2]   = usb_lo(name[i]);
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+        prop->bPropertyName[i*2+1] = usb_hi(name[i]);
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+    }
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+    return length*2;
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+}
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+
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+static int usb_desc_msos_prop_str(uint8_t *dest, msos_prop_type type,
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+                                  const wchar_t *name, const wchar_t *value)
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+{
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+    struct msos_prop *prop = (void *)dest;
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+    struct msos_prop_data *data;
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+    int length = sizeof(*prop);
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+    int i, vlen = wcslen(value) + 1;
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+
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+    prop->dwPropertyDataType = cpu_to_le32(type);
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+    length += usb_desc_msos_prop_name(prop, name);
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+    data = (void *)(dest + length);
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+
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+    data->dwPropertyDataLength = cpu_to_le32(vlen*2);
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+    length += sizeof(*prop);
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+
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+    for (i = 0; i < vlen; i++) {
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+        data->bPropertyData[i*2]   = usb_lo(value[i]);
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+        data->bPropertyData[i*2+1] = usb_hi(value[i]);
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+    }
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+    length += vlen*2;
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+
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+    prop->dwLength = cpu_to_le32(length);
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+    return length;
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+}
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+
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+static int usb_desc_msos_prop_dword(uint8_t *dest, const wchar_t *name,
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+                                    uint32_t value)
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+{
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+    struct msos_prop *prop = (void *)dest;
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+    struct msos_prop_data *data;
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+    int length = sizeof(*prop);
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+
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+    prop->dwPropertyDataType = cpu_to_le32(MSOS_REG_DWORD_LE);
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+    length += usb_desc_msos_prop_name(prop, name);
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+    data = (void *)(dest + length);
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+
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+    data->dwPropertyDataLength = cpu_to_le32(4);
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+    data->bPropertyData[0] = (value)       & 0xff;
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+    data->bPropertyData[1] = (value >>  8) & 0xff;
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+    data->bPropertyData[2] = (value >> 16) & 0xff;
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+    data->bPropertyData[3] = (value >> 24) & 0xff;
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+    length += sizeof(*prop) + 4;
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+
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+    prop->dwLength = cpu_to_le32(length);
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+    return length;
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+}
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+
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+static int usb_desc_msos_prop(const USBDesc *desc, uint8_t *dest)
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+{
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+    msos_prop_hdr *hdr = (void *)dest;
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+    int length = sizeof(*hdr);
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+    int count = 0;
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+
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+    if (desc->msos->Label) {
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+        /*
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+         * Given as example in the specs.  Havn't figured yet where
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+         * this label shows up in the windows gui.
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+         */
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+        length += usb_desc_msos_prop_str(dest+length, MSOS_REG_SZ,
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+                                         L"Label", desc->msos->Label);
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+        count++;
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+    }
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+
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+    if (desc->msos->SelectiveSuspendEnabled) {
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+        /*
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+         * Signaling remote wakeup capability in the standard usb
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+         * descriptors isn't enouth to make windows actually use it.
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+         * This is the "Yes, we really mean it" registy entry to flip
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+         * the switch in the windows drivers.
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+         */
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+        length += usb_desc_msos_prop_dword(dest+length,
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+                                           L"SelectiveSuspendEnabled", 1);
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+        count++;
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+    }
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+
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+    hdr->dwLength      = cpu_to_le32(length);
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+    hdr->bcdVersion_lo = 0x00;
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+    hdr->bcdVersion_hi = 0x01;
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+    hdr->wIndex_lo     = 0x05;
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+    hdr->wIndex_hi     = 0x00;
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+    hdr->wCount_lo     = usb_lo(count);
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+    hdr->wCount_hi     = usb_hi(count);
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+    return length;
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+}
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+
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+/* ------------------------------------------------------------------ */
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+
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+int usb_desc_msos(const USBDesc *desc,  USBPacket *p,
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+                  int index, uint8_t *dest, size_t len)
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+{
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+    void *buf = g_malloc0(4096);
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+    int length = 0;
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+
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+    switch (index) {
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+    case 0x0004:
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+        length = usb_desc_msos_compat(desc, buf);
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+        break;
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+    case 0x0005:
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+        length = usb_desc_msos_prop(desc, buf);
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+        break;
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+    }
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+
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+    if (length > len) {
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+        length = len;
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+    }
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+    memcpy(dest, buf, length);
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+    free(buf);
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+
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+    p->actual_length = length;
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+    return 0;
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+}
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diff --git a/hw/usb/desc.c b/hw/usb/desc.c
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index 3e560cd..5a954c6 100644
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--- a/hw/usb/desc.c
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+++ b/hw/usb/desc.c
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@@ -7,7 +7,7 @@
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 /* ------------------------------------------------------------------ */
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 int usb_desc_device(const USBDescID *id, const USBDescDevice *dev,
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-                    uint8_t *dest, size_t len)
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+                    bool msos, uint8_t *dest, size_t len)
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 {
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     uint8_t bLength = 0x12;
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     USBDescriptor *d = (void *)dest;
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@@ -19,8 +19,18 @@ int usb_desc_device(const USBDescID *id, const USBDescDevice *dev,
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     d->bLength                     = bLength;
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     d->bDescriptorType             = USB_DT_DEVICE;
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-    d->u.device.bcdUSB_lo          = usb_lo(dev->bcdUSB);
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-    d->u.device.bcdUSB_hi          = usb_hi(dev->bcdUSB);
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+    if (msos && dev->bcdUSB < 0x0200) {
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+        /*
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+         * Version 2.0+ required for microsoft os descriptors to work.
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+         * Done this way so msos-desc compat property will handle both
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+         * the version and the new descriptors being present.
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+         */
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+        d->u.device.bcdUSB_lo          = usb_lo(0x0200);
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+        d->u.device.bcdUSB_hi          = usb_hi(0x0200);
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+    } else {
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+        d->u.device.bcdUSB_lo          = usb_lo(dev->bcdUSB);
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+        d->u.device.bcdUSB_hi          = usb_hi(dev->bcdUSB);
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+    }
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     d->u.device.bDeviceClass       = dev->bDeviceClass;
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     d->u.device.bDeviceSubClass    = dev->bDeviceSubClass;
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     d->u.device.bDeviceProtocol    = dev->bDeviceProtocol;
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@@ -497,6 +507,10 @@ void usb_desc_init(USBDevice *dev)
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     if (desc->super) {
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         dev->speedmask |= USB_SPEED_MASK_SUPER;
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     }
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+    if (desc->msos && (dev->flags & (1 << USB_DEV_FLAG_MSOS_DESC_ENABLE))) {
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+        dev->flags |= (1 << USB_DEV_FLAG_MSOS_DESC_IN_USE);
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+        usb_desc_set_string(dev, 0xee, "MSFT100Q");
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+    }
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     usb_desc_setdefaults(dev);
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 }
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@@ -624,6 +638,7 @@ int usb_desc_string(USBDevice *dev, int index, uint8_t *dest, size_t len)
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 int usb_desc_get_descriptor(USBDevice *dev, USBPacket *p,
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                             int value, uint8_t *dest, size_t len)
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 {
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+    bool msos = (dev->flags & (1 << USB_DEV_FLAG_MSOS_DESC_IN_USE));
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     const USBDesc *desc = usb_device_get_usb_desc(dev);
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     const USBDescDevice *other_dev;
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     uint8_t buf[256];
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@@ -644,7 +659,7 @@ int usb_desc_get_descriptor(USBDevice *dev, USBPacket *p,
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     switch(type) {
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     case USB_DT_DEVICE:
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-        ret = usb_desc_device(&desc->id, dev->device, buf, sizeof(buf));
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+        ret = usb_desc_device(&desc->id, dev->device, msos, buf, sizeof(buf));
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         trace_usb_desc_device(dev->addr, len, ret);
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         break;
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     case USB_DT_CONFIG:
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@@ -701,6 +716,7 @@ int usb_desc_get_descriptor(USBDevice *dev, USBPacket *p,
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 int usb_desc_handle_control(USBDevice *dev, USBPacket *p,
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         int request, int value, int index, int length, uint8_t *data)
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 {
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+    bool msos = (dev->flags & (1 << USB_DEV_FLAG_MSOS_DESC_IN_USE));
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     const USBDesc *desc = usb_device_get_usb_desc(dev);
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     int ret = -1;
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@@ -780,6 +796,19 @@ int usb_desc_handle_control(USBDevice *dev, USBPacket *p,
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         trace_usb_set_interface(dev->addr, index, value, ret);
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         break;
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+    case VendorDeviceRequest | 'Q':
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+        if (msos) {
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+            ret = usb_desc_msos(desc, p, index, data, length);
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+            trace_usb_desc_msos(dev->addr, index, length, ret);
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+        }
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+        break;
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+    case VendorInterfaceRequest | 'Q':
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+        if (msos) {
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+            ret = usb_desc_msos(desc, p, index, data, length);
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+            trace_usb_desc_msos(dev->addr, index, length, ret);
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+        }
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+        break;
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+
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     }
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     return ret;
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 }
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diff --git a/hw/usb/desc.h b/hw/usb/desc.h
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index 81327b0..2b4fcda 100644
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--- a/hw/usb/desc.h
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+++ b/hw/usb/desc.h
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@@ -2,6 +2,7 @@
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 #define QEMU_HW_USB_DESC_H
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 #include <inttypes.h>
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+#include <wchar.h>
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 /* binary representation */
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 typedef struct USBDescriptor {
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@@ -182,6 +183,11 @@ struct USBDescOther {
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     const uint8_t             *data;
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 };
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+struct USBDescMSOS {
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+    const wchar_t             *Label;
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+    bool                      SelectiveSuspendEnabled;
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+};
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+
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 typedef const char *USBDescStrings[256];
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 struct USBDesc {
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@@ -190,6 +196,7 @@ struct USBDesc {
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     const USBDescDevice       *high;
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     const USBDescDevice       *super;
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     const char* const         *str;
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+    const USBDescMSOS         *msos;
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 };
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 #define USB_DESC_FLAG_SUPER (1 << 1)
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@@ -207,7 +214,7 @@ static inline uint8_t usb_hi(uint16_t val)
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 /* generate usb packages from structs */
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 int usb_desc_device(const USBDescID *id, const USBDescDevice *dev,
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-                    uint8_t *dest, size_t len);
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+                    bool msos, uint8_t *dest, size_t len);
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 int usb_desc_device_qualifier(const USBDescDevice *dev,
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                               uint8_t *dest, size_t len);
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 int usb_desc_config(const USBDescConfig *conf, int flags,
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@@ -219,6 +226,8 @@ int usb_desc_iface(const USBDescIface *iface, int flags,
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 int usb_desc_endpoint(const USBDescEndpoint *ep, int flags,
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                       uint8_t *dest, size_t len);
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 int usb_desc_other(const USBDescOther *desc, uint8_t *dest, size_t len);
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+int usb_desc_msos(const USBDesc *desc, USBPacket *p,
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+                  int index, uint8_t *dest, size_t len);
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 /* control message emulation helpers */
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 void usb_desc_init(USBDevice *dev);
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diff --git a/include/hw/usb.h b/include/hw/usb.h
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index a910456..b111be0 100644
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--- a/include/hw/usb.h
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+++ b/include/hw/usb.h
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@@ -182,6 +182,7 @@ typedef struct USBDescIface USBDescIface;
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 typedef struct USBDescEndpoint USBDescEndpoint;
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 typedef struct USBDescOther USBDescOther;
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 typedef struct USBDescString USBDescString;
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+typedef struct USBDescMSOS USBDescMSOS;
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 struct USBDescString {
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     uint8_t index;
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@@ -207,6 +208,8 @@ struct USBEndpoint {
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 enum USBDeviceFlags {
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     USB_DEV_FLAG_FULL_PATH,
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     USB_DEV_FLAG_IS_HOST,
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+    USB_DEV_FLAG_MSOS_DESC_ENABLE,
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+    USB_DEV_FLAG_MSOS_DESC_IN_USE,
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 };
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 /* definition of a USB device */
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diff --git a/trace-events b/trace-events
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index dbbd25d..5d86cf3 100644
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--- a/trace-events
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+++ b/trace-events
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@@ -393,6 +393,7 @@ usb_desc_config(int addr, int index, int len, int ret) "dev %d query config %d,
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 usb_desc_other_speed_config(int addr, int index, int len, int ret) "dev %d query config %d, len %d, ret %d"
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 usb_desc_string(int addr, int index, int len, int ret) "dev %d query string %d, len %d, ret %d"
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 usb_desc_bos(int addr, int len, int ret) "dev %d bos, len %d, ret %d"
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+usb_desc_msos(int addr, int index, int len, int ret) "dev %d msos, index 0x%x, len %d, ret %d"
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 usb_set_addr(int addr) "dev %d"
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 usb_set_config(int addr, int config, int ret) "dev %d, config %d, ret %d"
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 usb_set_interface(int addr, int iface, int alt, int ret) "dev %d, interface %d, altsetting %d, ret %d"
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-- 
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1.7.1
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