NetBSD-5.0.2/sys/dev/usb/usbroothub_subr.c

/* $NetBSD: usbroothub_subr.c,v 1.1 2008/02/03 10:57:13 drochner Exp $ */

/*
 * Copyright (c) 2008
 *	Matthias Drochner.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <dev/usb/usb.h>
#include <dev/usb/usbroothub_subr.h>

/* helper functions for USB root hub emulation */

int
usb_makestrdesc(usb_string_descriptor_t *p, int l, const char *s)
{
	int i;

	if (l == 0)
		return (0);
	p->bLength = 2 * strlen(s) + 2;
	if (l == 1)
		return (1);
	p->bDescriptorType = UDESC_STRING;
	l -= 2;
	/* poor man's utf-16le conversion */
	for (i = 0; s[i] && l > 1; i++, l -= 2)
		USETW2(p->bString[i], 0, s[i]);
	return (2 * i + 2);
}

int
usb_makelangtbl(usb_string_descriptor_t *p, int l)
{

	if (l == 0)
		return (0);
	p->bLength = 4;
	if (l == 1)
		return (1);
	p->bDescriptorType = UDESC_STRING;
	if (l <  4)
		return (2);
	USETW(p->bString[0], 0x0409); /* english/US */
	return (4);
}