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 33void 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 44int 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 65static 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 77void 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 90struct 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 119void nfc_llc_free(struct nfc_llc *llc) 120{ 121 llc->ops->deinit(llc); 122 kfree(llc); 123} 124 125int nfc_llc_start(struct nfc_llc *llc) 126{ 127 return llc->ops->start(llc); 128} 129EXPORT_SYMBOL(nfc_llc_start); 130 131int nfc_llc_stop(struct nfc_llc *llc) 132{ 133 return llc->ops->stop(llc); 134} 135EXPORT_SYMBOL(nfc_llc_stop); 136 137void nfc_llc_rcv_from_drv(struct nfc_llc *llc, struct sk_buff *skb) 138{ 139 llc->ops->rcv_from_drv(llc, skb); 140} 141 142int 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 147void *nfc_llc_get_data(struct nfc_llc *llc) 148{ 149 return llc->data; 150} 151