tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
12static LIST_HEAD(llc_engines);
13
14int __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
28exit:
29 nfc_llc_exit();
30 return r;
31}
32
33static 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
40void 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
48int 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
69static 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
81struct nfc_llc *nfc_llc_allocate(const char *name, struct nfc_hci_dev *hdev,
82 xmit_to_drv_t xmit_to_drv,
83 rcv_to_hci_t rcv_to_hci, int tx_headroom,
84 int tx_tailroom, llc_failure_t llc_failure)
85{
86 struct nfc_llc_engine *llc_engine;
87 struct nfc_llc *llc;
88
89 llc_engine = nfc_llc_name_to_engine(name);
90 if (llc_engine == NULL)
91 return NULL;
92
93 llc = kzalloc(sizeof(struct nfc_llc), GFP_KERNEL);
94 if (llc == NULL)
95 return NULL;
96
97 llc->data = llc_engine->ops->init(hdev, xmit_to_drv, rcv_to_hci,
98 tx_headroom, tx_tailroom,
99 &llc->rx_headroom, &llc->rx_tailroom,
100 llc_failure);
101 if (llc->data == NULL) {
102 kfree(llc);
103 return NULL;
104 }
105 llc->ops = llc_engine->ops;
106
107 return llc;
108}
109
110void nfc_llc_free(struct nfc_llc *llc)
111{
112 llc->ops->deinit(llc);
113 kfree(llc);
114}
115
116int nfc_llc_start(struct nfc_llc *llc)
117{
118 return llc->ops->start(llc);
119}
120EXPORT_SYMBOL(nfc_llc_start);
121
122int nfc_llc_stop(struct nfc_llc *llc)
123{
124 return llc->ops->stop(llc);
125}
126EXPORT_SYMBOL(nfc_llc_stop);
127
128void nfc_llc_rcv_from_drv(struct nfc_llc *llc, struct sk_buff *skb)
129{
130 llc->ops->rcv_from_drv(llc, skb);
131}
132
133int nfc_llc_xmit_from_hci(struct nfc_llc *llc, struct sk_buff *skb)
134{
135 return llc->ops->xmit_from_hci(llc, skb);
136}
137
138void *nfc_llc_get_data(struct nfc_llc *llc)
139{
140 return llc->data;
141}