llc.c
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/*
* Link Layer Control manager
*
* Copyright (C) 2012 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <net/nfc/llc.h>
#include "llc.h"
static LIST_HEAD(llc_engines);
int nfc_llc_init(void)
{
int r;
r = nfc_llc_nop_register();
if (r)
goto exit;
r = nfc_llc_shdlc_register();
if (r)
goto exit;
return 0;
exit:
nfc_llc_exit();
return r;
}
void nfc_llc_exit(void)
{
struct nfc_llc_engine *llc_engine, *n;
list_for_each_entry_safe(llc_engine, n, &llc_engines, entry) {
list_del(&llc_engine->entry);
kfree(llc_engine->name);
kfree(llc_engine);
}
}
int nfc_llc_register(const char *name, struct nfc_llc_ops *ops)
{
struct nfc_llc_engine *llc_engine;
llc_engine = kzalloc(sizeof(struct nfc_llc_engine), GFP_KERNEL);
if (llc_engine == NULL)
return -ENOMEM;
llc_engine->name = kstrdup(name, GFP_KERNEL);
if (llc_engine->name == NULL) {
kfree(llc_engine);
return -ENOMEM;
}
llc_engine->ops = ops;
INIT_LIST_HEAD(&llc_engine->entry);
list_add_tail(&llc_engine->entry, &llc_engines);
return 0;
}
static struct nfc_llc_engine *nfc_llc_name_to_engine(const char *name)
{
struct nfc_llc_engine *llc_engine;
list_for_each_entry(llc_engine, &llc_engines, entry) {
if (strcmp(llc_engine->name, name) == 0)
return llc_engine;
}
return NULL;
}
void nfc_llc_unregister(const char *name)
{
struct nfc_llc_engine *llc_engine;
llc_engine = nfc_llc_name_to_engine(name);
if (llc_engine == NULL)
return;
list_del(&llc_engine->entry);
kfree(llc_engine->name);
kfree(llc_engine);
}
struct nfc_llc *nfc_llc_allocate(const char *name, struct nfc_hci_dev *hdev,
xmit_to_drv_t xmit_to_drv,
rcv_to_hci_t rcv_to_hci, int tx_headroom,
int tx_tailroom, llc_failure_t llc_failure)
{
struct nfc_llc_engine *llc_engine;
struct nfc_llc *llc;
llc_engine = nfc_llc_name_to_engine(name);
if (llc_engine == NULL)
return NULL;
llc = kzalloc(sizeof(struct nfc_llc), GFP_KERNEL);
if (llc == NULL)
return NULL;
llc->data = llc_engine->ops->init(hdev, xmit_to_drv, rcv_to_hci,
tx_headroom, tx_tailroom,
&llc->rx_headroom, &llc->rx_tailroom,
llc_failure);
if (llc->data == NULL) {
kfree(llc);
return NULL;
}
llc->ops = llc_engine->ops;
return llc;
}
void nfc_llc_free(struct nfc_llc *llc)
{
llc->ops->deinit(llc);
kfree(llc);
}
inline void nfc_llc_get_rx_head_tail_room(struct nfc_llc *llc, int *rx_headroom,
int *rx_tailroom)
{
*rx_headroom = llc->rx_headroom;
*rx_tailroom = llc->rx_tailroom;
}
inline int nfc_llc_start(struct nfc_llc *llc)
{
return llc->ops->start(llc);
}
EXPORT_SYMBOL(nfc_llc_start);
inline int nfc_llc_stop(struct nfc_llc *llc)
{
return llc->ops->stop(llc);
}
EXPORT_SYMBOL(nfc_llc_stop);
inline void nfc_llc_rcv_from_drv(struct nfc_llc *llc, struct sk_buff *skb)
{
llc->ops->rcv_from_drv(llc, skb);
}
inline int nfc_llc_xmit_from_hci(struct nfc_llc *llc, struct sk_buff *skb)
{
return llc->ops->xmit_from_hci(llc, skb);
}
inline void *nfc_llc_get_data(struct nfc_llc *llc)
{
return llc->data;
}