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, write to the 17 * Free Software Foundation, Inc., 18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 19 */ 20 21 #include <linux/types.h> 22 23 #include "llc.h" 24 25 struct llc_nop { 26 struct nfc_hci_dev *hdev; 27 xmit_to_drv_t xmit_to_drv; 28 rcv_to_hci_t rcv_to_hci; 29 int tx_headroom; 30 int tx_tailroom; 31 llc_failure_t llc_failure; 32 }; 33 34 static void *llc_nop_init(struct nfc_hci_dev *hdev, xmit_to_drv_t xmit_to_drv, 35 rcv_to_hci_t rcv_to_hci, int tx_headroom, 36 int tx_tailroom, int *rx_headroom, int *rx_tailroom, 37 llc_failure_t llc_failure) 38 { 39 struct llc_nop *llc_nop; 40 41 *rx_headroom = 0; 42 *rx_tailroom = 0; 43 44 llc_nop = kzalloc(sizeof(struct llc_nop), GFP_KERNEL); 45 if (llc_nop == NULL) 46 return NULL; 47 48 llc_nop->hdev = hdev; 49 llc_nop->xmit_to_drv = xmit_to_drv; 50 llc_nop->rcv_to_hci = rcv_to_hci; 51 llc_nop->tx_headroom = tx_headroom; 52 llc_nop->tx_tailroom = tx_tailroom; 53 llc_nop->llc_failure = llc_failure; 54 55 return llc_nop; 56 } 57 58 static void llc_nop_deinit(struct nfc_llc *llc) 59 { 60 kfree(nfc_llc_get_data(llc)); 61 } 62 63 static int llc_nop_start(struct nfc_llc *llc) 64 { 65 return 0; 66 } 67 68 static int llc_nop_stop(struct nfc_llc *llc) 69 { 70 return 0; 71 } 72 73 static void llc_nop_rcv_from_drv(struct nfc_llc *llc, struct sk_buff *skb) 74 { 75 struct llc_nop *llc_nop = nfc_llc_get_data(llc); 76 77 llc_nop->rcv_to_hci(llc_nop->hdev, skb); 78 } 79 80 static int llc_nop_xmit_from_hci(struct nfc_llc *llc, struct sk_buff *skb) 81 { 82 struct llc_nop *llc_nop = nfc_llc_get_data(llc); 83 84 return llc_nop->xmit_to_drv(llc_nop->hdev, skb); 85 } 86 87 static struct nfc_llc_ops llc_nop_ops = { 88 .init = llc_nop_init, 89 .deinit = llc_nop_deinit, 90 .start = llc_nop_start, 91 .stop = llc_nop_stop, 92 .rcv_from_drv = llc_nop_rcv_from_drv, 93 .xmit_from_hci = llc_nop_xmit_from_hci, 94 }; 95 96 int nfc_llc_nop_register(void) 97 { 98 return nfc_llc_register(LLC_NOP_NAME, &llc_nop_ops); 99 } 100