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
nfc_llc_init(void)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
nfc_llc_exit(void)33 void nfc_llc_exit(void)
34 {
35 struct nfc_llc_engine *llc_engine, *n;
36
37 list_for_each_entry_safe(llc_engine, n, &llc_engines, entry) {
38 list_del(&llc_engine->entry);
39 kfree(llc_engine->name);
40 kfree(llc_engine);
41 }
42 }
43
nfc_llc_register(const char * name,const struct nfc_llc_ops * ops)44 int nfc_llc_register(const char *name, const struct nfc_llc_ops *ops)
45 {
46 struct nfc_llc_engine *llc_engine;
47
48 llc_engine = kzalloc(sizeof(struct nfc_llc_engine), GFP_KERNEL);
49 if (llc_engine == NULL)
50 return -ENOMEM;
51
52 llc_engine->name = kstrdup(name, GFP_KERNEL);
53 if (llc_engine->name == NULL) {
54 kfree(llc_engine);
55 return -ENOMEM;
56 }
57 llc_engine->ops = ops;
58
59 INIT_LIST_HEAD(&llc_engine->entry);
60 list_add_tail(&llc_engine->entry, &llc_engines);
61
62 return 0;
63 }
64
nfc_llc_name_to_engine(const char * name)65 static struct nfc_llc_engine *nfc_llc_name_to_engine(const char *name)
66 {
67 struct nfc_llc_engine *llc_engine;
68
69 list_for_each_entry(llc_engine, &llc_engines, entry) {
70 if (strcmp(llc_engine->name, name) == 0)
71 return llc_engine;
72 }
73
74 return NULL;
75 }
76
nfc_llc_unregister(const char * name)77 void nfc_llc_unregister(const char *name)
78 {
79 struct nfc_llc_engine *llc_engine;
80
81 llc_engine = nfc_llc_name_to_engine(name);
82 if (llc_engine == NULL)
83 return;
84
85 list_del(&llc_engine->entry);
86 kfree(llc_engine->name);
87 kfree(llc_engine);
88 }
89
nfc_llc_allocate(const char * name,struct nfc_hci_dev * hdev,xmit_to_drv_t xmit_to_drv,rcv_to_hci_t rcv_to_hci,int tx_headroom,int tx_tailroom,llc_failure_t llc_failure)90 struct nfc_llc *nfc_llc_allocate(const char *name, struct nfc_hci_dev *hdev,
91 xmit_to_drv_t xmit_to_drv,
92 rcv_to_hci_t rcv_to_hci, int tx_headroom,
93 int tx_tailroom, llc_failure_t llc_failure)
94 {
95 struct nfc_llc_engine *llc_engine;
96 struct nfc_llc *llc;
97
98 llc_engine = nfc_llc_name_to_engine(name);
99 if (llc_engine == NULL)
100 return NULL;
101
102 llc = kzalloc(sizeof(struct nfc_llc), GFP_KERNEL);
103 if (llc == NULL)
104 return NULL;
105
106 llc->data = llc_engine->ops->init(hdev, xmit_to_drv, rcv_to_hci,
107 tx_headroom, tx_tailroom,
108 &llc->rx_headroom, &llc->rx_tailroom,
109 llc_failure);
110 if (llc->data == NULL) {
111 kfree(llc);
112 return NULL;
113 }
114 llc->ops = llc_engine->ops;
115
116 return llc;
117 }
118
nfc_llc_free(struct nfc_llc * llc)119 void nfc_llc_free(struct nfc_llc *llc)
120 {
121 llc->ops->deinit(llc);
122 kfree(llc);
123 }
124
nfc_llc_start(struct nfc_llc * llc)125 int nfc_llc_start(struct nfc_llc *llc)
126 {
127 return llc->ops->start(llc);
128 }
129 EXPORT_SYMBOL(nfc_llc_start);
130
nfc_llc_stop(struct nfc_llc * llc)131 int nfc_llc_stop(struct nfc_llc *llc)
132 {
133 return llc->ops->stop(llc);
134 }
135 EXPORT_SYMBOL(nfc_llc_stop);
136
nfc_llc_rcv_from_drv(struct nfc_llc * llc,struct sk_buff * skb)137 void nfc_llc_rcv_from_drv(struct nfc_llc *llc, struct sk_buff *skb)
138 {
139 llc->ops->rcv_from_drv(llc, skb);
140 }
141
nfc_llc_xmit_from_hci(struct nfc_llc * llc,struct sk_buff * skb)142 int nfc_llc_xmit_from_hci(struct nfc_llc *llc, struct sk_buff *skb)
143 {
144 return llc->ops->xmit_from_hci(llc, skb);
145 }
146
nfc_llc_get_data(struct nfc_llc * llc)147 void *nfc_llc_get_data(struct nfc_llc *llc)
148 {
149 return llc->data;
150 }
151