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qemu-e2k/hw/usb/desc.c

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#include "qemu/osdep.h"
#include "hw/usb.h"
#include "hw/usb/desc.h"
#include "trace.h"
/* ------------------------------------------------------------------ */
int usb_desc_device(const USBDescID *id, const USBDescDevice *dev,
bool msos, uint8_t *dest, size_t len)
{
uint8_t bLength = 0x12;
USBDescriptor *d = (void *)dest;
if (len < bLength) {
return -1;
}
d->bLength = bLength;
d->bDescriptorType = USB_DT_DEVICE;
if (msos && dev->bcdUSB < 0x0200) {
/*
* Version 2.0+ required for microsoft os descriptors to work.
* Done this way so msos-desc compat property will handle both
* the version and the new descriptors being present.
*/
d->u.device.bcdUSB_lo = usb_lo(0x0200);
d->u.device.bcdUSB_hi = usb_hi(0x0200);
} else {
d->u.device.bcdUSB_lo = usb_lo(dev->bcdUSB);
d->u.device.bcdUSB_hi = usb_hi(dev->bcdUSB);
}
d->u.device.bDeviceClass = dev->bDeviceClass;
d->u.device.bDeviceSubClass = dev->bDeviceSubClass;
d->u.device.bDeviceProtocol = dev->bDeviceProtocol;
d->u.device.bMaxPacketSize0 = dev->bMaxPacketSize0;
d->u.device.idVendor_lo = usb_lo(id->idVendor);
d->u.device.idVendor_hi = usb_hi(id->idVendor);
d->u.device.idProduct_lo = usb_lo(id->idProduct);
d->u.device.idProduct_hi = usb_hi(id->idProduct);
d->u.device.bcdDevice_lo = usb_lo(id->bcdDevice);
d->u.device.bcdDevice_hi = usb_hi(id->bcdDevice);
d->u.device.iManufacturer = id->iManufacturer;
d->u.device.iProduct = id->iProduct;
d->u.device.iSerialNumber = id->iSerialNumber;
d->u.device.bNumConfigurations = dev->bNumConfigurations;
return bLength;
}
int usb_desc_device_qualifier(const USBDescDevice *dev,
uint8_t *dest, size_t len)
{
uint8_t bLength = 0x0a;
USBDescriptor *d = (void *)dest;
if (len < bLength) {
return -1;
}
d->bLength = bLength;
d->bDescriptorType = USB_DT_DEVICE_QUALIFIER;
d->u.device_qualifier.bcdUSB_lo = usb_lo(dev->bcdUSB);
d->u.device_qualifier.bcdUSB_hi = usb_hi(dev->bcdUSB);
d->u.device_qualifier.bDeviceClass = dev->bDeviceClass;
d->u.device_qualifier.bDeviceSubClass = dev->bDeviceSubClass;
d->u.device_qualifier.bDeviceProtocol = dev->bDeviceProtocol;
d->u.device_qualifier.bMaxPacketSize0 = dev->bMaxPacketSize0;
d->u.device_qualifier.bNumConfigurations = dev->bNumConfigurations;
d->u.device_qualifier.bReserved = 0;
return bLength;
}
int usb_desc_config(const USBDescConfig *conf, int flags,
uint8_t *dest, size_t len)
{
uint8_t bLength = 0x09;
uint16_t wTotalLength = 0;
USBDescriptor *d = (void *)dest;
int i, rc;
if (len < bLength) {
return -1;
}
d->bLength = bLength;
d->bDescriptorType = USB_DT_CONFIG;
d->u.config.bNumInterfaces = conf->bNumInterfaces;
d->u.config.bConfigurationValue = conf->bConfigurationValue;
d->u.config.iConfiguration = conf->iConfiguration;
d->u.config.bmAttributes = conf->bmAttributes;
d->u.config.bMaxPower = conf->bMaxPower;
wTotalLength += bLength;
/* handle grouped interfaces if any */
for (i = 0; i < conf->nif_groups; i++) {
rc = usb_desc_iface_group(&(conf->if_groups[i]), flags,
dest + wTotalLength,
len - wTotalLength);
if (rc < 0) {
return rc;
}
wTotalLength += rc;
}
/* handle normal (ungrouped / no IAD) interfaces if any */
for (i = 0; i < conf->nif; i++) {
rc = usb_desc_iface(conf->ifs + i, flags,
dest + wTotalLength, len - wTotalLength);
if (rc < 0) {
return rc;
}
wTotalLength += rc;
}
d->u.config.wTotalLength_lo = usb_lo(wTotalLength);
d->u.config.wTotalLength_hi = usb_hi(wTotalLength);
return wTotalLength;
}
int usb_desc_iface_group(const USBDescIfaceAssoc *iad, int flags,
uint8_t *dest, size_t len)
{
int pos = 0;
int i = 0;
/* handle interface association descriptor */
uint8_t bLength = 0x08;
if (len < bLength) {
return -1;
}
dest[0x00] = bLength;
dest[0x01] = USB_DT_INTERFACE_ASSOC;
dest[0x02] = iad->bFirstInterface;
dest[0x03] = iad->bInterfaceCount;
dest[0x04] = iad->bFunctionClass;
dest[0x05] = iad->bFunctionSubClass;
dest[0x06] = iad->bFunctionProtocol;
dest[0x07] = iad->iFunction;
pos += bLength;
/* handle associated interfaces in this group */
for (i = 0; i < iad->nif; i++) {
int rc = usb_desc_iface(&(iad->ifs[i]), flags, dest + pos, len - pos);
if (rc < 0) {
return rc;
}
pos += rc;
}
return pos;
}
int usb_desc_iface(const USBDescIface *iface, int flags,
uint8_t *dest, size_t len)
{
uint8_t bLength = 0x09;
int i, rc, pos = 0;
USBDescriptor *d = (void *)dest;
if (len < bLength) {
return -1;
}
d->bLength = bLength;
d->bDescriptorType = USB_DT_INTERFACE;
d->u.interface.bInterfaceNumber = iface->bInterfaceNumber;
d->u.interface.bAlternateSetting = iface->bAlternateSetting;
d->u.interface.bNumEndpoints = iface->bNumEndpoints;
d->u.interface.bInterfaceClass = iface->bInterfaceClass;
d->u.interface.bInterfaceSubClass = iface->bInterfaceSubClass;
d->u.interface.bInterfaceProtocol = iface->bInterfaceProtocol;
d->u.interface.iInterface = iface->iInterface;
pos += bLength;
for (i = 0; i < iface->ndesc; i++) {
rc = usb_desc_other(iface->descs + i, dest + pos, len - pos);
if (rc < 0) {
return rc;
}
pos += rc;
}
for (i = 0; i < iface->bNumEndpoints; i++) {
rc = usb_desc_endpoint(iface->eps + i, flags, dest + pos, len - pos);
if (rc < 0) {
return rc;
}
pos += rc;
}
return pos;
}
int usb_desc_endpoint(const USBDescEndpoint *ep, int flags,
uint8_t *dest, size_t len)
{
uint8_t bLength = ep->is_audio ? 0x09 : 0x07;
uint8_t extralen = ep->extra ? ep->extra[0] : 0;
uint8_t superlen = (flags & USB_DESC_FLAG_SUPER) ? 0x06 : 0;
USBDescriptor *d = (void *)dest;
if (len < bLength + extralen + superlen) {
return -1;
}
d->bLength = bLength;
d->bDescriptorType = USB_DT_ENDPOINT;
d->u.endpoint.bEndpointAddress = ep->bEndpointAddress;
d->u.endpoint.bmAttributes = ep->bmAttributes;
d->u.endpoint.wMaxPacketSize_lo = usb_lo(ep->wMaxPacketSize);
d->u.endpoint.wMaxPacketSize_hi = usb_hi(ep->wMaxPacketSize);
d->u.endpoint.bInterval = ep->bInterval;
if (ep->is_audio) {
d->u.endpoint.bRefresh = ep->bRefresh;
d->u.endpoint.bSynchAddress = ep->bSynchAddress;
}
if (superlen) {
USBDescriptor *d = (void *)(dest + bLength);
d->bLength = 0x06;
d->bDescriptorType = USB_DT_ENDPOINT_COMPANION;
d->u.super_endpoint.bMaxBurst = ep->bMaxBurst;
d->u.super_endpoint.bmAttributes = ep->bmAttributes_super;
d->u.super_endpoint.wBytesPerInterval_lo =
usb_lo(ep->wBytesPerInterval);
d->u.super_endpoint.wBytesPerInterval_hi =
usb_hi(ep->wBytesPerInterval);
}
if (ep->extra) {
memcpy(dest + bLength + superlen, ep->extra, extralen);
}
return bLength + extralen + superlen;
}
int usb_desc_other(const USBDescOther *desc, uint8_t *dest, size_t len)
{
int bLength = desc->length ? desc->length : desc->data[0];
if (len < bLength) {
return -1;
}
memcpy(dest, desc->data, bLength);
return bLength;
}
static int usb_desc_cap_usb2_ext(const USBDesc *desc, uint8_t *dest, size_t len)
{
uint8_t bLength = 0x07;
USBDescriptor *d = (void *)dest;
if (len < bLength) {
return -1;
}
d->bLength = bLength;
d->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
d->u.cap.bDevCapabilityType = USB_DEV_CAP_USB2_EXT;
d->u.cap.u.usb2_ext.bmAttributes_1 = (1 << 1); /* LPM */
d->u.cap.u.usb2_ext.bmAttributes_2 = 0;
d->u.cap.u.usb2_ext.bmAttributes_3 = 0;
d->u.cap.u.usb2_ext.bmAttributes_4 = 0;
return bLength;
}
static int usb_desc_cap_super(const USBDesc *desc, uint8_t *dest, size_t len)
{
uint8_t bLength = 0x0a;
USBDescriptor *d = (void *)dest;
if (len < bLength) {
return -1;
}
d->bLength = bLength;
d->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
d->u.cap.bDevCapabilityType = USB_DEV_CAP_SUPERSPEED;
d->u.cap.u.super.bmAttributes = 0;
d->u.cap.u.super.wSpeedsSupported_lo = 0;
d->u.cap.u.super.wSpeedsSupported_hi = 0;
d->u.cap.u.super.bFunctionalitySupport = 0;
d->u.cap.u.super.bU1DevExitLat = 0x0a;
d->u.cap.u.super.wU2DevExitLat_lo = 0x20;
d->u.cap.u.super.wU2DevExitLat_hi = 0;
if (desc->full) {
d->u.cap.u.super.wSpeedsSupported_lo |= (1 << 1);
d->u.cap.u.super.bFunctionalitySupport = 1;
}
if (desc->high) {
d->u.cap.u.super.wSpeedsSupported_lo |= (1 << 2);
if (!d->u.cap.u.super.bFunctionalitySupport) {
d->u.cap.u.super.bFunctionalitySupport = 2;
}
}
if (desc->super) {
d->u.cap.u.super.wSpeedsSupported_lo |= (1 << 3);
if (!d->u.cap.u.super.bFunctionalitySupport) {
d->u.cap.u.super.bFunctionalitySupport = 3;
}
}
return bLength;
}
static int usb_desc_bos(const USBDesc *desc, uint8_t *dest, size_t len)
{
uint8_t bLength = 0x05;
uint16_t wTotalLength = 0;
uint8_t bNumDeviceCaps = 0;
USBDescriptor *d = (void *)dest;
int rc;
if (len < bLength) {
return -1;
}
d->bLength = bLength;
d->bDescriptorType = USB_DT_BOS;
wTotalLength += bLength;
if (desc->high != NULL) {
rc = usb_desc_cap_usb2_ext(desc, dest + wTotalLength,
len - wTotalLength);
if (rc < 0) {
return rc;
}
wTotalLength += rc;
bNumDeviceCaps++;
}
if (desc->super != NULL) {
rc = usb_desc_cap_super(desc, dest + wTotalLength,
len - wTotalLength);
if (rc < 0) {
return rc;
}
wTotalLength += rc;
bNumDeviceCaps++;
}
d->u.bos.wTotalLength_lo = usb_lo(wTotalLength);
d->u.bos.wTotalLength_hi = usb_hi(wTotalLength);
d->u.bos.bNumDeviceCaps = bNumDeviceCaps;
return wTotalLength;
}
/* ------------------------------------------------------------------ */
static void usb_desc_ep_init(USBDevice *dev)
{
const USBDescIface *iface;
int i, e, pid, ep;
usb_ep_init(dev);
for (i = 0; i < dev->ninterfaces; i++) {
iface = dev->ifaces[i];
if (iface == NULL) {
continue;
}
for (e = 0; e < iface->bNumEndpoints; e++) {
pid = (iface->eps[e].bEndpointAddress & USB_DIR_IN) ?
USB_TOKEN_IN : USB_TOKEN_OUT;
ep = iface->eps[e].bEndpointAddress & 0x0f;
usb_ep_set_type(dev, pid, ep, iface->eps[e].bmAttributes & 0x03);
usb_ep_set_ifnum(dev, pid, ep, iface->bInterfaceNumber);
usb_ep_set_max_packet_size(dev, pid, ep,
iface->eps[e].wMaxPacketSize);
usb_ep_set_max_streams(dev, pid, ep,
iface->eps[e].bmAttributes_super);
}
}
}
static const USBDescIface *usb_desc_find_interface(USBDevice *dev,
int nif, int alt)
{
const USBDescIface *iface;
int g, i;
if (!dev->config) {
return NULL;
}
for (g = 0; g < dev->config->nif_groups; g++) {
for (i = 0; i < dev->config->if_groups[g].nif; i++) {
iface = &dev->config->if_groups[g].ifs[i];
if (iface->bInterfaceNumber == nif &&
iface->bAlternateSetting == alt) {
return iface;
}
}
}
for (i = 0; i < dev->config->nif; i++) {
iface = &dev->config->ifs[i];
if (iface->bInterfaceNumber == nif &&
iface->bAlternateSetting == alt) {
return iface;
}
}
return NULL;
}
static int usb_desc_set_interface(USBDevice *dev, int index, int value)
{
const USBDescIface *iface;
int old;
iface = usb_desc_find_interface(dev, index, value);
if (iface == NULL) {
return -1;
}
old = dev->altsetting[index];
dev->altsetting[index] = value;
dev->ifaces[index] = iface;
usb_desc_ep_init(dev);
if (old != value) {
usb_device_set_interface(dev, index, old, value);
}
return 0;
}
static int usb_desc_set_config(USBDevice *dev, int value)
{
int i;
if (value == 0) {
dev->configuration = 0;
dev->ninterfaces = 0;
dev->config = NULL;
} else {
for (i = 0; i < dev->device->bNumConfigurations; i++) {
if (dev->device->confs[i].bConfigurationValue == value) {
dev->configuration = value;
dev->ninterfaces = dev->device->confs[i].bNumInterfaces;
dev->config = dev->device->confs + i;
assert(dev->ninterfaces <= USB_MAX_INTERFACES);
}
}
if (i < dev->device->bNumConfigurations) {
return -1;
}
}
for (i = 0; i < dev->ninterfaces; i++) {
usb_desc_set_interface(dev, i, 0);
}
for (; i < USB_MAX_INTERFACES; i++) {
dev->altsetting[i] = 0;
dev->ifaces[i] = NULL;
}
return 0;
}
static void usb_desc_setdefaults(USBDevice *dev)
{
const USBDesc *desc = usb_device_get_usb_desc(dev);
assert(desc != NULL);
switch (dev->speed) {
case USB_SPEED_LOW:
case USB_SPEED_FULL:
dev->device = desc->full;
break;
case USB_SPEED_HIGH:
dev->device = desc->high;
break;
case USB_SPEED_SUPER:
dev->device = desc->super;
break;
}
usb_desc_set_config(dev, 0);
}
void usb_desc_init(USBDevice *dev)
{
const USBDesc *desc = usb_device_get_usb_desc(dev);
assert(desc != NULL);
dev->speed = USB_SPEED_FULL;
dev->speedmask = 0;
if (desc->full) {
dev->speedmask |= USB_SPEED_MASK_FULL;
}
if (desc->high) {
dev->speedmask |= USB_SPEED_MASK_HIGH;
}
if (desc->super) {
dev->speedmask |= USB_SPEED_MASK_SUPER;
}
if (desc->msos && (dev->flags & (1 << USB_DEV_FLAG_MSOS_DESC_ENABLE))) {
dev->flags |= (1 << USB_DEV_FLAG_MSOS_DESC_IN_USE);
usb_desc_set_string(dev, 0xee, "MSFT100Q");
}
usb_desc_setdefaults(dev);
}
void usb_desc_attach(USBDevice *dev)
{
usb_desc_setdefaults(dev);
}
void usb_desc_set_string(USBDevice *dev, uint8_t index, const char *str)
{
USBDescString *s;
QLIST_FOREACH(s, &dev->strings, next) {
if (s->index == index) {
break;
}
}
if (s == NULL) {
s = g_malloc0(sizeof(*s));
s->index = index;
QLIST_INSERT_HEAD(&dev->strings, s, next);
}
g_free(s->str);
s->str = g_strdup(str);
}
/*
* This function creates a serial number for a usb device.
* The serial number should:
* (a) Be unique within the virtual machine.
* (b) Be constant, so you don't get a new one each
* time the guest is started.
* So we are using the physical location to generate a serial number
* from it. It has three pieces: First a fixed, device-specific
* prefix. Second the device path of the host controller (which is
* the pci address in most cases). Third the physical port path.
* Results in serial numbers like this: "314159-0000:00:1d.7-3".
*/
void usb_desc_create_serial(USBDevice *dev)
{
DeviceState *hcd = dev->qdev.parent_bus->parent;
const USBDesc *desc = usb_device_get_usb_desc(dev);
int index = desc->id.iSerialNumber;
char *path, *serial;
if (dev->serial) {
/* 'serial' usb bus property has priority if present */
usb_desc_set_string(dev, index, dev->serial);
return;
}
assert(index != 0 && desc->str[index] != NULL);
path = qdev_get_dev_path(hcd);
if (path) {
serial = g_strdup_printf("%s-%s-%s", desc->str[index],
path, dev->port->path);
} else {
serial = g_strdup_printf("%s-%s", desc->str[index], dev->port->path);
}
usb_desc_set_string(dev, index, serial);
g_free(path);
g_free(serial);
}
const char *usb_desc_get_string(USBDevice *dev, uint8_t index)
{
USBDescString *s;
QLIST_FOREACH(s, &dev->strings, next) {
if (s->index == index) {
return s->str;
}
}
return NULL;
}
int usb_desc_string(USBDevice *dev, int index, uint8_t *dest, size_t len)
{
uint8_t bLength, pos, i;
const char *str;
if (len < 4) {
return -1;
}
if (index == 0) {
/* language ids */
dest[0] = 4;
dest[1] = USB_DT_STRING;
dest[2] = 0x09;
dest[3] = 0x04;
return 4;
}
str = usb_desc_get_string(dev, index);
if (str == NULL) {
str = usb_device_get_usb_desc(dev)->str[index];
if (str == NULL) {
return 0;
}
}
bLength = strlen(str) * 2 + 2;
dest[0] = bLength;
dest[1] = USB_DT_STRING;
i = 0; pos = 2;
while (pos+1 < bLength && pos+1 < len) {
dest[pos++] = str[i++];
dest[pos++] = 0;
}
return pos;
}
int usb_desc_get_descriptor(USBDevice *dev, USBPacket *p,
int value, uint8_t *dest, size_t len)
{
bool msos = (dev->flags & (1 << USB_DEV_FLAG_MSOS_DESC_IN_USE));
const USBDesc *desc = usb_device_get_usb_desc(dev);
const USBDescDevice *other_dev;
uint8_t buf[256];
uint8_t type = value >> 8;
uint8_t index = value & 0xff;
int flags, ret = -1;
if (dev->speed == USB_SPEED_HIGH) {
other_dev = usb_device_get_usb_desc(dev)->full;
} else {
other_dev = usb_device_get_usb_desc(dev)->high;
}
flags = 0;
if (dev->device->bcdUSB >= 0x0300) {
flags |= USB_DESC_FLAG_SUPER;
}
switch(type) {
case USB_DT_DEVICE:
ret = usb_desc_device(&desc->id, dev->device, msos, buf, sizeof(buf));
trace_usb_desc_device(dev->addr, len, ret);
break;
case USB_DT_CONFIG:
if (index < dev->device->bNumConfigurations) {
ret = usb_desc_config(dev->device->confs + index, flags,
buf, sizeof(buf));
}
trace_usb_desc_config(dev->addr, index, len, ret);
break;
case USB_DT_STRING:
ret = usb_desc_string(dev, index, buf, sizeof(buf));
trace_usb_desc_string(dev->addr, index, len, ret);
break;
case USB_DT_DEVICE_QUALIFIER:
if (other_dev != NULL) {
ret = usb_desc_device_qualifier(other_dev, buf, sizeof(buf));
}
trace_usb_desc_device_qualifier(dev->addr, len, ret);
break;
case USB_DT_OTHER_SPEED_CONFIG:
if (other_dev != NULL && index < other_dev->bNumConfigurations) {
ret = usb_desc_config(other_dev->confs + index, flags,
buf, sizeof(buf));
buf[0x01] = USB_DT_OTHER_SPEED_CONFIG;
}
trace_usb_desc_other_speed_config(dev->addr, index, len, ret);
break;
case USB_DT_BOS:
ret = usb_desc_bos(desc, buf, sizeof(buf));
trace_usb_desc_bos(dev->addr, len, ret);
break;
case USB_DT_DEBUG:
/* ignore silently */
break;
default:
fprintf(stderr, "%s: %d unknown type %d (len %zd)\n", __FUNCTION__,
dev->addr, type, len);
break;
}
if (ret > 0) {
if (ret > len) {
ret = len;
}
memcpy(dest, buf, ret);
p->actual_length = ret;
ret = 0;
}
return ret;
}
int usb_desc_handle_control(USBDevice *dev, USBPacket *p,
int request, int value, int index, int length, uint8_t *data)
{
bool msos = (dev->flags & (1 << USB_DEV_FLAG_MSOS_DESC_IN_USE));
const USBDesc *desc = usb_device_get_usb_desc(dev);
int ret = -1;
assert(desc != NULL);
switch(request) {
case DeviceOutRequest | USB_REQ_SET_ADDRESS:
dev->addr = value;
trace_usb_set_addr(dev->addr);
ret = 0;
break;
case DeviceRequest | USB_REQ_GET_DESCRIPTOR:
ret = usb_desc_get_descriptor(dev, p, value, data, length);
break;
case DeviceRequest | USB_REQ_GET_CONFIGURATION:
/*
* 9.4.2: 0 should be returned if the device is unconfigured, otherwise
* the non zero value of bConfigurationValue.
*/
data[0] = dev->config ? dev->config->bConfigurationValue : 0;
p->actual_length = 1;
ret = 0;
break;
case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
ret = usb_desc_set_config(dev, value);
trace_usb_set_config(dev->addr, value, ret);
break;
case DeviceRequest | USB_REQ_GET_STATUS: {
const USBDescConfig *config = dev->config ?
dev->config : &dev->device->confs[0];
data[0] = 0;
/*
* Default state: Device behavior when this request is received while
* the device is in the Default state is not specified.
* We return the same value that a configured device would return if
* it used the first configuration.
*/
if (config->bmAttributes & USB_CFG_ATT_SELFPOWER) {
data[0] |= 1 << USB_DEVICE_SELF_POWERED;
}
if (dev->remote_wakeup) {
data[0] |= 1 << USB_DEVICE_REMOTE_WAKEUP;
}
data[1] = 0x00;
p->actual_length = 2;
ret = 0;
break;
}
case DeviceOutRequest | USB_REQ_CLEAR_FEATURE:
if (value == USB_DEVICE_REMOTE_WAKEUP) {
dev->remote_wakeup = 0;
ret = 0;
}
trace_usb_clear_device_feature(dev->addr, value, ret);
break;
case DeviceOutRequest | USB_REQ_SET_FEATURE:
if (value == USB_DEVICE_REMOTE_WAKEUP) {
dev->remote_wakeup = 1;
ret = 0;
}
trace_usb_set_device_feature(dev->addr, value, ret);
break;
case InterfaceRequest | USB_REQ_GET_INTERFACE:
if (index < 0 || index >= dev->ninterfaces) {
break;
}
data[0] = dev->altsetting[index];
p->actual_length = 1;
ret = 0;
break;
case InterfaceOutRequest | USB_REQ_SET_INTERFACE:
ret = usb_desc_set_interface(dev, index, value);
trace_usb_set_interface(dev->addr, index, value, ret);
break;
case VendorDeviceRequest | 'Q':
if (msos) {
ret = usb_desc_msos(desc, p, index, data, length);
trace_usb_desc_msos(dev->addr, index, length, ret);
}
break;
case VendorInterfaceRequest | 'Q':
if (msos) {
ret = usb_desc_msos(desc, p, index, data, length);
trace_usb_desc_msos(dev->addr, index, length, ret);
}
break;
}
return ret;
}
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