1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Link Layer Control manager |
4 | * |
5 | * Copyright (C) 2012 Intel Corporation. All rights reserved. |
6 | */ |
7 | |
8 | #include <net/nfc/llc.h> |
9 | |
10 | #include "llc.h" |
11 | |
12 | static LIST_HEAD(llc_engines); |
13 | |
14 | int __init nfc_llc_init(void) |
15 | { |
16 | int r; |
17 | |
18 | r = nfc_llc_nop_register(); |
19 | if (r) |
20 | goto exit; |
21 | |
22 | r = nfc_llc_shdlc_register(); |
23 | if (r) |
24 | goto exit; |
25 | |
26 | return 0; |
27 | |
28 | exit: |
29 | nfc_llc_exit(); |
30 | return r; |
31 | } |
32 | |
33 | static void nfc_llc_del_engine(struct nfc_llc_engine *llc_engine) |
34 | { |
35 | list_del(entry: &llc_engine->entry); |
36 | kfree_const(x: llc_engine->name); |
37 | kfree(objp: llc_engine); |
38 | } |
39 | |
40 | void nfc_llc_exit(void) |
41 | { |
42 | struct nfc_llc_engine *llc_engine, *n; |
43 | |
44 | list_for_each_entry_safe(llc_engine, n, &llc_engines, entry) |
45 | nfc_llc_del_engine(llc_engine); |
46 | } |
47 | |
48 | int nfc_llc_register(const char *name, const struct nfc_llc_ops *ops) |
49 | { |
50 | struct nfc_llc_engine *llc_engine; |
51 | |
52 | llc_engine = kzalloc(size: sizeof(struct nfc_llc_engine), GFP_KERNEL); |
53 | if (llc_engine == NULL) |
54 | return -ENOMEM; |
55 | |
56 | llc_engine->name = kstrdup_const(s: name, GFP_KERNEL); |
57 | if (llc_engine->name == NULL) { |
58 | kfree(objp: llc_engine); |
59 | return -ENOMEM; |
60 | } |
61 | llc_engine->ops = ops; |
62 | |
63 | INIT_LIST_HEAD(list: &llc_engine->entry); |
64 | list_add_tail(new: &llc_engine->entry, head: &llc_engines); |
65 | |
66 | return 0; |
67 | } |
68 | |
69 | static struct nfc_llc_engine *nfc_llc_name_to_engine(const char *name) |
70 | { |
71 | struct nfc_llc_engine *llc_engine; |
72 | |
73 | list_for_each_entry(llc_engine, &llc_engines, entry) { |
74 | if (strcmp(llc_engine->name, name) == 0) |
75 | return llc_engine; |
76 | } |
77 | |
78 | return NULL; |
79 | } |
80 | |
81 | void nfc_llc_unregister(const char *name) |
82 | { |
83 | struct nfc_llc_engine *llc_engine; |
84 | |
85 | llc_engine = nfc_llc_name_to_engine(name); |
86 | if (llc_engine == NULL) |
87 | return; |
88 | |
89 | nfc_llc_del_engine(llc_engine); |
90 | } |
91 | |
92 | struct nfc_llc *nfc_llc_allocate(const char *name, struct nfc_hci_dev *hdev, |
93 | xmit_to_drv_t xmit_to_drv, |
94 | rcv_to_hci_t rcv_to_hci, int tx_headroom, |
95 | int tx_tailroom, llc_failure_t llc_failure) |
96 | { |
97 | struct nfc_llc_engine *llc_engine; |
98 | struct nfc_llc *llc; |
99 | |
100 | llc_engine = nfc_llc_name_to_engine(name); |
101 | if (llc_engine == NULL) |
102 | return NULL; |
103 | |
104 | llc = kzalloc(size: sizeof(struct nfc_llc), GFP_KERNEL); |
105 | if (llc == NULL) |
106 | return NULL; |
107 | |
108 | llc->data = llc_engine->ops->init(hdev, xmit_to_drv, rcv_to_hci, |
109 | tx_headroom, tx_tailroom, |
110 | &llc->rx_headroom, &llc->rx_tailroom, |
111 | llc_failure); |
112 | if (llc->data == NULL) { |
113 | kfree(objp: llc); |
114 | return NULL; |
115 | } |
116 | llc->ops = llc_engine->ops; |
117 | |
118 | return llc; |
119 | } |
120 | |
121 | void nfc_llc_free(struct nfc_llc *llc) |
122 | { |
123 | llc->ops->deinit(llc); |
124 | kfree(objp: llc); |
125 | } |
126 | |
127 | int nfc_llc_start(struct nfc_llc *llc) |
128 | { |
129 | return llc->ops->start(llc); |
130 | } |
131 | EXPORT_SYMBOL(nfc_llc_start); |
132 | |
133 | int nfc_llc_stop(struct nfc_llc *llc) |
134 | { |
135 | return llc->ops->stop(llc); |
136 | } |
137 | EXPORT_SYMBOL(nfc_llc_stop); |
138 | |
139 | void nfc_llc_rcv_from_drv(struct nfc_llc *llc, struct sk_buff *skb) |
140 | { |
141 | llc->ops->rcv_from_drv(llc, skb); |
142 | } |
143 | |
144 | int nfc_llc_xmit_from_hci(struct nfc_llc *llc, struct sk_buff *skb) |
145 | { |
146 | return llc->ops->xmit_from_hci(llc, skb); |
147 | } |
148 | |
149 | void *nfc_llc_get_data(struct nfc_llc *llc) |
150 | { |
151 | return llc->data; |
152 | } |
153 | |