1 /* 2 * nop (passthrough) Link Layer Control 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, see <http://www.gnu.org/licenses/>. 17 */ 18 19 #include <linux/types.h> 20 21 #include "llc.h" 22 23 struct llc_nop { 24 struct nfc_hci_dev *hdev; 25 xmit_to_drv_t xmit_to_drv; 26 rcv_to_hci_t rcv_to_hci; 27 int tx_headroom; 28 int tx_tailroom; 29 llc_failure_t llc_failure; 30 }; 31 32 static void *llc_nop_init(struct nfc_hci_dev *hdev, xmit_to_drv_t xmit_to_drv, 33 rcv_to_hci_t rcv_to_hci, int tx_headroom, 34 int tx_tailroom, int *rx_headroom, int *rx_tailroom, 35 llc_failure_t llc_failure) 36 { 37 struct llc_nop *llc_nop; 38 39 *rx_headroom = 0; 40 *rx_tailroom = 0; 41 42 llc_nop = kzalloc(sizeof(struct llc_nop), GFP_KERNEL); 43 if (llc_nop == NULL) 44 return NULL; 45 46 llc_nop->hdev = hdev; 47 llc_nop->xmit_to_drv = xmit_to_drv; 48 llc_nop->rcv_to_hci = rcv_to_hci; 49 llc_nop->tx_headroom = tx_headroom; 50 llc_nop->tx_tailroom = tx_tailroom; 51 llc_nop->llc_failure = llc_failure; 52 53 return llc_nop; 54 } 55 56 static void llc_nop_deinit(struct nfc_llc *llc) 57 { 58 kfree(nfc_llc_get_data(llc)); 59 } 60 61 static int llc_nop_start(struct nfc_llc *llc) 62 { 63 return 0; 64 } 65 66 static int llc_nop_stop(struct nfc_llc *llc) 67 { 68 return 0; 69 } 70 71 static void llc_nop_rcv_from_drv(struct nfc_llc *llc, struct sk_buff *skb) 72 { 73 struct llc_nop *llc_nop = nfc_llc_get_data(llc); 74 75 llc_nop->rcv_to_hci(llc_nop->hdev, skb); 76 } 77 78 static int llc_nop_xmit_from_hci(struct nfc_llc *llc, struct sk_buff *skb) 79 { 80 struct llc_nop *llc_nop = nfc_llc_get_data(llc); 81 82 return llc_nop->xmit_to_drv(llc_nop->hdev, skb); 83 } 84 85 static struct nfc_llc_ops llc_nop_ops = { 86 .init = llc_nop_init, 87 .deinit = llc_nop_deinit, 88 .start = llc_nop_start, 89 .stop = llc_nop_stop, 90 .rcv_from_drv = llc_nop_rcv_from_drv, 91 .xmit_from_hci = llc_nop_xmit_from_hci, 92 }; 93 94 int nfc_llc_nop_register(void) 95 { 96 return nfc_llc_register(LLC_NOP_NAME, &llc_nop_ops); 97 } 98