78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
/* $FreeBSD$ */
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/*-
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* Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <dev/usb/usb_core.h>
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#include <dev/usb/usb_mbuf.h>
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/*------------------------------------------------------------------------*
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* usb_alloc_mbufs - allocate mbufs to an usbd interface queue
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*
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* Returns:
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* A pointer that should be passed to "free()" when the buffer(s)
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* should be released.
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*------------------------------------------------------------------------*/
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void *
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usb_alloc_mbufs(struct malloc_type *type, struct usb_ifqueue *ifq,
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usb_size_t block_size, uint16_t nblocks)
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{
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struct usb_mbuf *m_ptr;
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uint8_t *data_ptr;
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void *free_ptr = NULL;
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usb_size_t alloc_size;
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/* align data */
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block_size += ((-block_size) & (USB_HOST_ALIGN - 1));
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if (nblocks && block_size) {
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alloc_size = (block_size + sizeof(struct usb_mbuf)) * nblocks;
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free_ptr = malloc(alloc_size, type, M_WAITOK | M_ZERO);
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if (free_ptr == NULL) {
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goto done;
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}
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m_ptr = free_ptr;
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data_ptr = (void *)(m_ptr + nblocks);
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while (nblocks--) {
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m_ptr->cur_data_ptr =
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m_ptr->min_data_ptr = data_ptr;
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m_ptr->cur_data_len =
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m_ptr->max_data_len = block_size;
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USB_IF_ENQUEUE(ifq, m_ptr);
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m_ptr++;
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data_ptr += block_size;
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}
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}
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done:
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return (free_ptr);
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}
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