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 81void 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 92struct 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 121void nfc_llc_free(struct nfc_llc *llc) 122{ 123 llc->ops->deinit(llc); 124 kfree(llc); 125} 126 127int nfc_llc_start(struct nfc_llc *llc) 128{ 129 return llc->ops->start(llc); 130} 131EXPORT_SYMBOL(nfc_llc_start); 132 133int nfc_llc_stop(struct nfc_llc *llc) 134{ 135 return llc->ops->stop(llc); 136} 137EXPORT_SYMBOL(nfc_llc_stop); 138 139void nfc_llc_rcv_from_drv(struct nfc_llc *llc, struct sk_buff *skb) 140{ 141 llc->ops->rcv_from_drv(llc, skb); 142} 143 144int 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 149void *nfc_llc_get_data(struct nfc_llc *llc) 150{ 151 return llc->data; 152} 153