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