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, see <http://www.gnu.org/licenses/>.
  17 */
  18
  19#include <linux/types.h>
  20
  21#include "llc.h"
  22
  23struct llc_nop {
  24        struct nfc_hci_dev *hdev;
  25        xmit_to_drv_t xmit_to_drv;
  26        rcv_to_hci_t rcv_to_hci;
  27        int tx_headroom;
  28        int tx_tailroom;
  29        llc_failure_t llc_failure;
  30};
  31
  32static void *llc_nop_init(struct nfc_hci_dev *hdev, xmit_to_drv_t xmit_to_drv,
  33                          rcv_to_hci_t rcv_to_hci, int tx_headroom,
  34                          int tx_tailroom, int *rx_headroom, int *rx_tailroom,
  35                          llc_failure_t llc_failure)
  36{
  37        struct llc_nop *llc_nop;
  38
  39        *rx_headroom = 0;
  40        *rx_tailroom = 0;
  41
  42        llc_nop = kzalloc(sizeof(struct llc_nop), GFP_KERNEL);
  43        if (llc_nop == NULL)
  44                return NULL;
  45
  46        llc_nop->hdev = hdev;
  47        llc_nop->xmit_to_drv = xmit_to_drv;
  48        llc_nop->rcv_to_hci = rcv_to_hci;
  49        llc_nop->tx_headroom = tx_headroom;
  50        llc_nop->tx_tailroom = tx_tailroom;
  51        llc_nop->llc_failure = llc_failure;
  52
  53        return llc_nop;
  54}
  55
  56static void llc_nop_deinit(struct nfc_llc *llc)
  57{
  58        kfree(nfc_llc_get_data(llc));
  59}
  60
  61static int llc_nop_start(struct nfc_llc *llc)
  62{
  63        return 0;
  64}
  65
  66static int llc_nop_stop(struct nfc_llc *llc)
  67{
  68        return 0;
  69}
  70
  71static void llc_nop_rcv_from_drv(struct nfc_llc *llc, struct sk_buff *skb)
  72{
  73        struct llc_nop *llc_nop = nfc_llc_get_data(llc);
  74
  75        llc_nop->rcv_to_hci(llc_nop->hdev, skb);
  76}
  77
  78static int llc_nop_xmit_from_hci(struct nfc_llc *llc, struct sk_buff *skb)
  79{
  80        struct llc_nop *llc_nop = nfc_llc_get_data(llc);
  81
  82        return llc_nop->xmit_to_drv(llc_nop->hdev, skb);
  83}
  84
  85static struct nfc_llc_ops llc_nop_ops = {
  86        .init = llc_nop_init,
  87        .deinit = llc_nop_deinit,
  88        .start = llc_nop_start,
  89        .stop = llc_nop_stop,
  90        .rcv_from_drv = llc_nop_rcv_from_drv,
  91        .xmit_from_hci = llc_nop_xmit_from_hci,
  92};
  93
  94int nfc_llc_nop_register(void)
  95{
  96        return nfc_llc_register(LLC_NOP_NAME, &llc_nop_ops);
  97}
  98