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(&llc_engine->entry);
36 kfree_const(llc_engine->name);
37 kfree(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(sizeof(struct nfc_llc_engine), GFP_KERNEL);
53 if (llc_engine == NULL)
54 return -ENOMEM;
55
56 llc_engine->name = kstrdup_const(name, GFP_KERNEL);
57 if (llc_engine->name == NULL) {
58 kfree(llc_engine);
59 return -ENOMEM;
60 }
61 llc_engine->ops = ops;
62
63 INIT_LIST_HEAD(&llc_engine->entry);
64 list_add_tail(&llc_engine->entry, &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(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(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(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
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