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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 by Christian Gmeiner
*
* Based on linux/drivers/usb/gadget/config.c
* Copyright (C) 2003 David Brownell
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <string.h>
#include "usbstack/core.h"
static int usb_descriptor_fillbuf(void* buf, unsigned buflen,
struct usb_descriptor_header** src)
{
uint8_t* dest = buf;
if (!src) {
return -EINVAL;
}
/* fill buffer from src[] until null descriptor ptr */
for (; 0 != *src; src++) {
unsigned len = (*src)->bLength;
if (len > buflen)
return -EINVAL;
memcpy(dest, *src, len);
buflen -= len;
dest += len;
}
return dest - (uint8_t *)buf;
}
int usb_stack_configdesc(const struct usb_config_descriptor* config, void* buf,
unsigned length, struct usb_descriptor_header** desc)
{
struct usb_config_descriptor* cp = buf;
int len;
if (length < USB_DT_CONFIG_SIZE || !desc) {
return -EINVAL;
}
/* config descriptor first */
*cp = *config;
/* then interface/endpoint/class/vendor/... */
len = usb_descriptor_fillbuf(USB_DT_CONFIG_SIZE + (uint8_t*)buf,
length - USB_DT_CONFIG_SIZE, desc);
if (len < 0) {
return len;
}
len += USB_DT_CONFIG_SIZE;
if (len > 0xffff) {
return -EINVAL;
}
/* patch up the config descriptor */
cp->bLength = USB_DT_CONFIG_SIZE;
cp->bDescriptorType = USB_DT_CONFIG;
cp->wTotalLength = len;
cp->bmAttributes |= USB_CONFIG_ATT_ONE;
return len;
}
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