#include "qemu/osdep.h"
#include "hw/usb.h"
#include "desc.h"
/*
* Microsoft OS Descriptors
*
* Windows tries to fetch some special descriptors with information
* specifically for windows. Presence is indicated using a special
* string @ index 0xee. There are two kinds of descriptors:
*
* compatid descriptor
* Used to bind drivers, if usb class isn't specific enough.
* Used for PTP/MTP for example (both share the same usb class).
*
* properties descriptor
* Does carry registry entries. They show up in
* HLM\SYSTEM\CurrentControlSet\Enum\USB\<devid>\<serial>\Device Parameters
*
* Note that Windows caches the stuff it got in the registry, so when
* playing with this you have to delete registry subtrees to make
* windows query the device again:
* HLM\SYSTEM\CurrentControlSet\Control\usbflags
* HLM\SYSTEM\CurrentControlSet\Enum\USB
* Windows will complain it can't delete entries on the second one.
* It has deleted everything it had permissions too, which is enough
* as this includes "Device Parameters".
*
* http://msdn.microsoft.com/en-us/library/windows/hardware/ff537430.aspx
*
*/
/* ------------------------------------------------------------------ */
typedef struct msos_compat_hdr {
uint32_t dwLength;
uint8_t bcdVersion_lo;
uint8_t bcdVersion_hi;
uint8_t wIndex_lo;
uint8_t wIndex_hi;
uint8_t bCount;
uint8_t reserved[7];
} QEMU_PACKED msos_compat_hdr;
typedef struct msos_compat_func {
uint8_t bFirstInterfaceNumber;
uint8_t reserved_1;
char compatibleId[8];
uint8_t subCompatibleId[8];
uint8_t reserved_2[6];
} QEMU_PACKED msos_compat_func;
static int usb_desc_msos_compat(const USBDesc *desc, uint8_t *dest)
{
msos_compat_hdr *hdr = (void *)dest;
msos_compat_func *func;
int length = sizeof(*hdr);
int count = 0;
func = (void *)(dest + length);
func->bFirstInterfaceNumber = 0;
func->reserved_1 = 0x01;
if (desc->msos->CompatibleID) {
snprintf(func->compatibleId, sizeof(func->compatibleId),
"%s", desc->msos->CompatibleID);
}
length += sizeof(*func);
count++;
hdr->dwLength = cpu_to_le32(length);
hdr->bcdVersion_lo = 0x00;
hdr->bcdVersion_hi = 0x01;
hdr->wIndex_lo = 0x04;
hdr->wIndex_hi = 0x00;
hdr->bCount = count;
return length;
}
/* ------------------------------------------------------------------ */
typedef struct msos_prop_hdr {
uint32_t dwLength;
uint8_t bcdVersion_lo;
uint8_t bcdVersion_hi;
uint8_t wIndex_lo;
uint8_t wIndex_hi;
uint8_t wCount_lo;
uint8_t wCount_hi;
} QEMU_PACKED msos_prop_hdr;
typedef struct msos_prop {
uint32_t dwLength;
uint32_t dwPropertyDataType;
uint8_t dwPropertyNameLength_lo;
uint8_t dwPropertyNameLength_hi;
uint8_t bPropertyName[];
} QEMU_PACKED msos_prop;
typedef struct msos_prop_data {
uint32_t dwPropertyDataLength;
uint8_t bPropertyData[];
} QEMU_PACKED msos_prop_data;
typedef enum msos_prop_type {
MSOS_REG_SZ = 1,
MSOS_REG_EXPAND_SZ = 2,
MSOS_REG_BINARY = 3,
MSOS_REG_DWORD_LE = 4,
MSOS_REG_DWORD_BE = 5,
MSOS_REG_LINK = 6,
MSOS_REG_MULTI_SZ = 7,
} msos_prop_type;
static int usb_desc_msos_prop_name(struct msos_prop *prop,
const wchar_t *name)
{
int length = wcslen(name) + 1;
int i;
prop->dwPropertyNameLength_lo = usb_lo(length*2);
prop->dwPropertyNameLength_hi = usb_hi(length*2);
for (i = 0; i < length; i++) {
prop->bPropertyName[i*2] = usb_lo(name[i]);
prop->bPropertyName[i*2+1] = usb_hi(name[i]);
}
return length*2;
}
static int usb_desc_msos_prop_str(uint8_t *dest, msos_prop_type type,
const wchar_t *name, const wchar_t *value)
{
struct msos_prop *prop = (void *)dest;
struct msos_prop_data *data;
int length = sizeof(*prop);
int i, vlen = wcslen(value) + 1;
prop->dwPropertyDataType = cpu_to_le32(type);
length += usb_desc_msos_prop_name(prop, name);
data = (void *)(dest + length);
data->dwPropertyDataLength = cpu_to_le32(vlen*2);
length += sizeof(*prop);
for (i = 0; i < vlen; i++) {
data->bPropertyData[i*2] = usb_lo(value[i]);
data->bPropertyData[i*2+1] = usb_hi(value[i]);
}
length += vlen*2;
prop->dwLength = cpu_to_le32(length);
return length;
}
static int usb_desc_msos_prop_dword(uint8_t *dest, const wchar_t *name,
uint32_t value)
{
struct msos_prop *prop = (void *)dest;
struct msos_prop_data *data;
int length = sizeof(*prop);
prop->dwPropertyDataType = cpu_to_le32(MSOS_REG_DWORD_LE);
length += usb_desc_msos_prop_name(prop, name);
data = (void *)(dest + length);
data->dwPropertyDataLength = cpu_to_le32(4);
data->bPropertyData[0] = (value) & 0xff;
data->bPropertyData[1] = (value >> 8) & 0xff;
data->bPropertyData[2] = (value >> 16) & 0xff;
data->bPropertyData[3] = (value >> 24) & 0xff;
length += sizeof(*prop) + 4;
prop->dwLength = cpu_to_le32(length);
return length;
}
static int usb_desc_msos_prop(const USBDesc *desc, uint8_t *dest)
{
msos_prop_hdr *hdr = (void *)dest;
int length = sizeof(*hdr);
int count = 0;
if (desc->msos->Label) {
/*
* Given as example in the specs. Haven't figured yet where
* this label shows up in the windows gui.
*/
length += usb_desc_msos_prop_str(dest+length, MSOS_REG_SZ,
L"Label", desc->msos->Label);
count++;
}
if (desc->msos->SelectiveSuspendEnabled) {
/*
* Signaling remote wakeup capability in the standard usb
* descriptors isn't enough to make windows actually use it.
* This is the "Yes, we really mean it" registry entry to flip
* the switch in the windows drivers.
*/
length += usb_desc_msos_prop_dword(dest+length,
L"SelectiveSuspendEnabled", 1);
count++;
}
hdr->dwLength = cpu_to_le32(length);
hdr->bcdVersion_lo = 0x00;
hdr->bcdVersion_hi = 0x01;
hdr->wIndex_lo = 0x05;
hdr->wIndex_hi = 0x00;
hdr->wCount_lo = usb_lo(count);
hdr->wCount_hi = usb_hi(count);
return length;
}
/* ------------------------------------------------------------------ */
int usb_desc_msos(const USBDesc *desc, USBPacket *p,
int index, uint8_t *dest, size_t len)
{
void *buf = g_malloc0(4096);
int length = 0;
switch (index) {
case 0x0004:
length = usb_desc_msos_compat(desc, buf);
break;
case 0x0005:
length = usb_desc_msos_prop(desc, buf);
break;
}
if (length > len) {
length = len;
}
memcpy(dest, buf, length);
g_free(buf);
p->actual_length = length;
return 0;
}
