xref: /openbmc/linux/net/nfc/hci/llc_nop.c (revision 3932b9ca)
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 
23 struct 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 
32 static 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 
56 static void llc_nop_deinit(struct nfc_llc *llc)
57 {
58 	kfree(nfc_llc_get_data(llc));
59 }
60 
61 static int llc_nop_start(struct nfc_llc *llc)
62 {
63 	return 0;
64 }
65 
66 static int llc_nop_stop(struct nfc_llc *llc)
67 {
68 	return 0;
69 }
70 
71 static 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 
78 static 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 
85 static 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 
94 int nfc_llc_nop_register(void)
95 {
96 	return nfc_llc_register(LLC_NOP_NAME, &llc_nop_ops);
97 }
98