Usb Stack: only setup packet handling, and not enabled by default as there is a lot to do.

* settings code is not fully ready -> changing device driver has no effect
* clean ups
* check copyriths
* find a way to detect IN transfers
* support for full and highspeed
* ...




git-svn-id: svn://svn.rockbox.org/rockbox/trunk@14470 a1c6a512-1295-4272-9138-f99709370657

firmware/usbstack/core/config.c

@@ -0,0 +1,80 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   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;
+
+		logf("len: %d", len);
+		
+		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;
+}