LXR linux/net/nfc/hci/llc.c

   1/*
   2 * Link Layer Control manager
   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 <net/nfc/llc.h>
  22
  23#include "llc.h"
  24
  25static struct list_head llc_engines;
  26
  27int nfc_llc_init(void)
  28{
  29        int r;
  30
  31        INIT_LIST_HEAD(&llc_engines);
  32
  33        r = nfc_llc_nop_register();
  34        if (r)
  35                goto exit;
  36
  37        r = nfc_llc_shdlc_register();
  38        if (r)
  39                goto exit;
  40
  41        return 0;
  42
  43exit:
  44        nfc_llc_exit();
  45        return r;
  46}
  47
  48void nfc_llc_exit(void)
  49{
  50        struct nfc_llc_engine *llc_engine, *n;
  51
  52        list_for_each_entry_safe(llc_engine, n, &llc_engines, entry) {
  53                list_del(&llc_engine->entry);
  54                kfree(llc_engine->name);
  55                kfree(llc_engine);
  56        }
  57}
  58
  59int nfc_llc_register(const char *name, struct nfc_llc_ops *ops)
  60{
  61        struct nfc_llc_engine *llc_engine;
  62
  63        llc_engine = kzalloc(sizeof(struct nfc_llc_engine), GFP_KERNEL);
  64        if (llc_engine == NULL)
  65                return -ENOMEM;
  66
  67        llc_engine->name = kstrdup(name, GFP_KERNEL);
  68        if (llc_engine->name == NULL) {
  69                kfree(llc_engine);
  70                return -ENOMEM;
  71        }
  72        llc_engine->ops = ops;
  73
  74        INIT_LIST_HEAD(&llc_engine->entry);
  75        list_add_tail(&llc_engine->entry, &llc_engines);
  76
  77        return 0;
  78}
  79
  80static struct nfc_llc_engine *nfc_llc_name_to_engine(const char *name)
  81{
  82        struct nfc_llc_engine *llc_engine;
  83
  84        list_for_each_entry(llc_engine, &llc_engines, entry) {
  85                if (strcmp(llc_engine->name, name) == 0)
  86                        return llc_engine;
  87        }
  88
  89        return NULL;
  90}
  91
  92void nfc_llc_unregister(const char *name)
  93{
  94        struct nfc_llc_engine *llc_engine;
  95
  96        llc_engine = nfc_llc_name_to_engine(name);
  97        if (llc_engine == NULL)
  98                return;
  99
 100        list_del(&llc_engine->entry);
 101        kfree(llc_engine->name);
 102        kfree(llc_engine);
 103}
 104
 105struct nfc_llc *nfc_llc_allocate(const char *name, struct nfc_hci_dev *hdev,
 106                                 xmit_to_drv_t xmit_to_drv,
 107                                 rcv_to_hci_t rcv_to_hci, int tx_headroom,
 108                                 int tx_tailroom, llc_failure_t llc_failure)
 109{
 110        struct nfc_llc_engine *llc_engine;
 111        struct nfc_llc *llc;
 112
 113        llc_engine = nfc_llc_name_to_engine(name);
 114        if (llc_engine == NULL)
 115                return NULL;
 116
 117        llc = kzalloc(sizeof(struct nfc_llc), GFP_KERNEL);
 118        if (llc == NULL)
 119                return NULL;
 120
 121        llc->data = llc_engine->ops->init(hdev, xmit_to_drv, rcv_to_hci,
 122                                          tx_headroom, tx_tailroom,
 123                                          &llc->rx_headroom, &llc->rx_tailroom,
 124                                          llc_failure);
 125        if (llc->data == NULL) {
 126                kfree(llc);
 127                return NULL;
 128        }
 129        llc->ops = llc_engine->ops;
 130
 131        return llc;
 132}
 133
 134void nfc_llc_free(struct nfc_llc *llc)
 135{
 136        llc->ops->deinit(llc);
 137        kfree(llc);
 138}
 139
 140inline void nfc_llc_get_rx_head_tail_room(struct nfc_llc *llc, int *rx_headroom,
 141                                          int *rx_tailroom)
 142{
 143        *rx_headroom = llc->rx_headroom;
 144        *rx_tailroom = llc->rx_tailroom;
 145}
 146
 147inline int nfc_llc_start(struct nfc_llc *llc)
 148{
 149        return llc->ops->start(llc);
 150}
 151
 152inline int nfc_llc_stop(struct nfc_llc *llc)
 153{
 154        return llc->ops->stop(llc);
 155}
 156
 157inline void nfc_llc_rcv_from_drv(struct nfc_llc *llc, struct sk_buff *skb)
 158{
 159        llc->ops->rcv_from_drv(llc, skb);
 160}
 161
 162inline int nfc_llc_xmit_from_hci(struct nfc_llc *llc, struct sk_buff *skb)
 163{
 164        return llc->ops->xmit_from_hci(llc, skb);
 165}
 166
 167inline void *nfc_llc_get_data(struct nfc_llc *llc)
 168{
 169        return llc->data;
 170}
 171