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https://gitea.osmocom.org/sim-card/simtrace2.git
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f4a625be53
This is in preparation for limiting the maximum queue length Change-Id: I7cb184d7a1ccb519010a2f3e3295cc3a5fbf8052 Related: OS#4251
94 lines
2.4 KiB
C
94 lines
2.4 KiB
C
/* USB buffer library
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA
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*/
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#include "board.h"
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#include "trace.h"
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#include "usb_buf.h"
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#include "simtrace_usb.h"
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/msgb.h>
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#include <errno.h>
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#define USB_ALLOC_SIZE 280
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static struct usb_buffered_ep usb_buffered_ep[BOARD_USB_NUMENDPOINTS];
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struct usb_buffered_ep *usb_get_buf_ep(uint8_t ep)
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{
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if (ep >= ARRAY_SIZE(usb_buffered_ep))
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return NULL;
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return &usb_buffered_ep[ep];
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}
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/***********************************************************************
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* User API
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***********************************************************************/
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struct llist_head *usb_get_queue(uint8_t ep)
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{
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struct usb_buffered_ep *bep = usb_get_buf_ep(ep);
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if (!bep)
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return NULL;
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return &bep->queue;
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}
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/* allocate a USB buffer for use with given end-point */
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struct msgb *usb_buf_alloc(uint8_t ep)
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{
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struct msgb *msg;
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msg = msgb_alloc(USB_ALLOC_SIZE, "USB");
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if (!msg)
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return NULL;
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msg->dst = usb_get_buf_ep(ep);
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return msg;
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}
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/* release/return the USB buffer to the pool */
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void usb_buf_free(struct msgb *msg)
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{
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msgb_free(msg);
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}
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/* submit a USB buffer for transmission to host */
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int usb_buf_submit(struct msgb *msg)
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{
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struct usb_buffered_ep *ep = msg->dst;
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if (!msg->dst) {
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TRACE_ERROR("%s: msg without dst\r\n", __func__);
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usb_buf_free(msg);
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return -EINVAL;
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}
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/* no need for irqsafe operation, as the usb_tx_queue is
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* processed only by the main loop context */
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msgb_enqueue_count(&ep->queue, msg, &ep->queue_len);
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return 0;
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}
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void usb_buf_init(void)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(usb_buffered_ep); i++) {
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struct usb_buffered_ep *ep = &usb_buffered_ep[i];
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INIT_LLIST_HEAD(&ep->queue);
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}
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}
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