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(size: 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(objp: 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, ops: &llc_nop_ops); |
86 | } |
87 | |