1 /* 2 * Link Layer Control manager 3 * 4 * Copyright (C) 2012 Intel Corporation. All rights reserved. 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2, as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the 17 * Free Software Foundation, Inc., 18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 19 */ 20 21 #include <net/nfc/llc.h> 22 23 #include "llc.h" 24 25 static struct list_head llc_engines; 26 27 int nfc_llc_init(void) 28 { 29 int r; 30 31 INIT_LIST_HEAD(&llc_engines); 32 33 r = nfc_llc_nop_register(); 34 if (r) 35 goto exit; 36 37 r = nfc_llc_shdlc_register(); 38 if (r) 39 goto exit; 40 41 return 0; 42 43 exit: 44 nfc_llc_exit(); 45 return r; 46 } 47 48 void nfc_llc_exit(void) 49 { 50 struct nfc_llc_engine *llc_engine, *n; 51 52 list_for_each_entry_safe(llc_engine, n, &llc_engines, entry) { 53 list_del(&llc_engine->entry); 54 kfree(llc_engine->name); 55 kfree(llc_engine); 56 } 57 } 58 59 int nfc_llc_register(const char *name, struct nfc_llc_ops *ops) 60 { 61 struct nfc_llc_engine *llc_engine; 62 63 llc_engine = kzalloc(sizeof(struct nfc_llc_engine), GFP_KERNEL); 64 if (llc_engine == NULL) 65 return -ENOMEM; 66 67 llc_engine->name = kstrdup(name, GFP_KERNEL); 68 if (llc_engine->name == NULL) { 69 kfree(llc_engine); 70 return -ENOMEM; 71 } 72 llc_engine->ops = ops; 73 74 INIT_LIST_HEAD(&llc_engine->entry); 75 list_add_tail(&llc_engine->entry, &llc_engines); 76 77 return 0; 78 } 79 80 static struct nfc_llc_engine *nfc_llc_name_to_engine(const char *name) 81 { 82 struct nfc_llc_engine *llc_engine; 83 84 list_for_each_entry(llc_engine, &llc_engines, entry) { 85 if (strcmp(llc_engine->name, name) == 0) 86 return llc_engine; 87 } 88 89 return NULL; 90 } 91 92 void nfc_llc_unregister(const char *name) 93 { 94 struct nfc_llc_engine *llc_engine; 95 96 llc_engine = nfc_llc_name_to_engine(name); 97 if (llc_engine == NULL) 98 return; 99 100 list_del(&llc_engine->entry); 101 kfree(llc_engine->name); 102 kfree(llc_engine); 103 } 104 105 struct nfc_llc *nfc_llc_allocate(const char *name, struct nfc_hci_dev *hdev, 106 xmit_to_drv_t xmit_to_drv, 107 rcv_to_hci_t rcv_to_hci, int tx_headroom, 108 int tx_tailroom, llc_failure_t llc_failure) 109 { 110 struct nfc_llc_engine *llc_engine; 111 struct nfc_llc *llc; 112 113 llc_engine = nfc_llc_name_to_engine(name); 114 if (llc_engine == NULL) 115 return NULL; 116 117 llc = kzalloc(sizeof(struct nfc_llc), GFP_KERNEL); 118 if (llc == NULL) 119 return NULL; 120 121 llc->data = llc_engine->ops->init(hdev, xmit_to_drv, rcv_to_hci, 122 tx_headroom, tx_tailroom, 123 &llc->rx_headroom, &llc->rx_tailroom, 124 llc_failure); 125 if (llc->data == NULL) { 126 kfree(llc); 127 return NULL; 128 } 129 llc->ops = llc_engine->ops; 130 131 return llc; 132 } 133 134 void nfc_llc_free(struct nfc_llc *llc) 135 { 136 llc->ops->deinit(llc); 137 kfree(llc); 138 } 139 140 inline void nfc_llc_get_rx_head_tail_room(struct nfc_llc *llc, int *rx_headroom, 141 int *rx_tailroom) 142 { 143 *rx_headroom = llc->rx_headroom; 144 *rx_tailroom = llc->rx_tailroom; 145 } 146 147 inline int nfc_llc_start(struct nfc_llc *llc) 148 { 149 return llc->ops->start(llc); 150 } 151 152 inline int nfc_llc_stop(struct nfc_llc *llc) 153 { 154 return llc->ops->stop(llc); 155 } 156 157 inline void nfc_llc_rcv_from_drv(struct nfc_llc *llc, struct sk_buff *skb) 158 { 159 llc->ops->rcv_from_drv(llc, skb); 160 } 161 162 inline int nfc_llc_xmit_from_hci(struct nfc_llc *llc, struct sk_buff *skb) 163 { 164 return llc->ops->xmit_from_hci(llc, skb); 165 } 166 167 inline void *nfc_llc_get_data(struct nfc_llc *llc) 168 { 169 return llc->data; 170 } 171