1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * nop (passthrough) Link Layer Control
4 *
5 * Copyright (C) 2012 Intel Corporation. All rights reserved.
6 */
7
8 #include <linux/types.h>
9
10 #include "llc.h"
11
12 struct llc_nop {
13 struct nfc_hci_dev *hdev;
14 xmit_to_drv_t xmit_to_drv;
15 rcv_to_hci_t rcv_to_hci;
16 int tx_headroom;
17 int tx_tailroom;
18 llc_failure_t llc_failure;
19 };
20
21 static void *llc_nop_init(struct nfc_hci_dev *hdev, xmit_to_drv_t xmit_to_drv,
22 rcv_to_hci_t rcv_to_hci, int tx_headroom,
23 int tx_tailroom, int *rx_headroom, int *rx_tailroom,
24 llc_failure_t llc_failure)
25 {
26 struct llc_nop *llc_nop;
27
28 *rx_headroom = 0;
29 *rx_tailroom = 0;
30
31 llc_nop = kzalloc(sizeof(struct llc_nop), GFP_KERNEL);
32 if (llc_nop == NULL)
33 return NULL;
34
35 llc_nop->hdev = hdev;
36 llc_nop->xmit_to_drv = xmit_to_drv;
37 llc_nop->rcv_to_hci = rcv_to_hci;
38 llc_nop->tx_headroom = tx_headroom;
39 llc_nop->tx_tailroom = tx_tailroom;
40 llc_nop->llc_failure = llc_failure;
41
42 return llc_nop;
43 }
44
45 static void llc_nop_deinit(struct nfc_llc *llc)
46 {
47 kfree(nfc_llc_get_data(llc));
48 }
49
50 static int llc_nop_start(struct nfc_llc *llc)
51 {
52 return 0;
53 }
54
55 static int llc_nop_stop(struct nfc_llc *llc)
56 {
57 return 0;
58 }
59
60 static void llc_nop_rcv_from_drv(struct nfc_llc *llc, struct sk_buff *skb)
61 {
62 struct llc_nop *llc_nop = nfc_llc_get_data(llc);
63
64 llc_nop->rcv_to_hci(llc_nop->hdev, skb);
65 }
66
67 static int llc_nop_xmit_from_hci(struct nfc_llc *llc, struct sk_buff *skb)
68 {
69 struct llc_nop *llc_nop = nfc_llc_get_data(llc);
70
71 return llc_nop->xmit_to_drv(llc_nop->hdev, skb);
72 }
73
74 static const struct nfc_llc_ops llc_nop_ops = {
75 .init = llc_nop_init,
76 .deinit = llc_nop_deinit,
77 .start = llc_nop_start,
78 .stop = llc_nop_stop,
79 .rcv_from_drv = llc_nop_rcv_from_drv,
80 .xmit_from_hci = llc_nop_xmit_from_hci,
81 };
82
83 int nfc_llc_nop_register(void)
84 {
85 return nfc_llc_register(LLC_NOP_NAME, &llc_nop_ops);
86 }
87
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