LXR linux/net/nfc/hci/llc

   1/*
   2 * nop (passthrough) Link Layer Control
   3 *
   4 * Copyright (C) 2012  Intel Corporation. All rights reserved.
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms and conditions of the GNU General Public License,
   8 * version 2, as published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the
  17 * Free Software Foundation, Inc.,
  18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  19 */
  20
  21#include <linux/types.h>
  22
  23#include "llc.h"
  24
  25struct llc_nop {
  26        struct nfc_hci_dev *hdev;
  27        xmit_to_drv_t xmit_to_drv;
  28        rcv_to_hci_t rcv_to_hci;
  29        int tx_headroom;
  30        int tx_tailroom;
  31        llc_failure_t llc_failure;
  32};
  33
  34static void *llc_nop_init(struct nfc_hci_dev *hdev, xmit_to_drv_t xmit_to_drv,
  35                          rcv_to_hci_t rcv_to_hci, int tx_headroom,
  36                          int tx_tailroom, int *rx_headroom, int *rx_tailroom,
  37                          llc_failure_t llc_failure)
  38{
  39        struct llc_nop *llc_nop;
  40
  41        *rx_headroom = 0;
  42        *rx_tailroom = 0;
  43
  44        llc_nop = kzalloc(sizeof(struct llc_nop), GFP_KERNEL);
  45        if (llc_nop == NULL)
  46                return NULL;
  47
  48        llc_nop->hdev = hdev;
  49        llc_nop->xmit_to_drv = xmit_to_drv;
  50        llc_nop->rcv_to_hci = rcv_to_hci;
  51        llc_nop->tx_headroom = tx_headroom;
  52        llc_nop->tx_tailroom = tx_tailroom;
  53        llc_nop->llc_failure = llc_failure;
  54
  55        return llc_nop;
  56}
  57
  58static void llc_nop_deinit(struct nfc_llc *llc)
  59{
  60        kfree(nfc_llc_get_data(llc));
  61}
  62
  63static int llc_nop_start(struct nfc_llc *llc)
  64{
  65        return 0;
  66}
  67
  68static int llc_nop_stop(struct nfc_llc *llc)
  69{
  70        return 0;
  71}
  72
  73static void llc_nop_rcv_from_drv(struct nfc_llc *llc, struct sk_buff *skb)
  74{
  75        struct llc_nop *llc_nop = nfc_llc_get_data(llc);
  76
  77        llc_nop->rcv_to_hci(llc_nop->hdev, skb);
  78}
  79
  80static int llc_nop_xmit_from_hci(struct nfc_llc *llc, struct sk_buff *skb)
  81{
  82        struct llc_nop *llc_nop = nfc_llc_get_data(llc);
  83
  84        return llc_nop->xmit_to_drv(llc_nop->hdev, skb);
  85}
  86
  87static struct nfc_llc_ops llc_nop_ops = {
  88        .init = llc_nop_init,
  89        .deinit = llc_nop_deinit,
  90        .start = llc_nop_start,
  91        .stop = llc_nop_stop,
  92        .rcv_from_drv = llc_nop_rcv_from_drv,
  93        .xmit_from_hci = llc_nop_xmit_from_hci,
  94};
  95
  96int nfc_llc_nop_register(void)
  97{
  98        return nfc_llc_register(LLC_NOP_NAME, &llc_nop_ops);
  99}
 100