1 /* 2 * 3 * Bluetooth HCI UART driver 4 * 5 * Copyright (C) 2000-2001 Qualcomm Incorporated 6 * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com> 7 * Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org> 8 * 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 23 * 24 */ 25 26 #include <linux/module.h> 27 28 #include <linux/kernel.h> 29 #include <linux/init.h> 30 #include <linux/types.h> 31 #include <linux/fcntl.h> 32 #include <linux/interrupt.h> 33 #include <linux/ptrace.h> 34 #include <linux/poll.h> 35 36 #include <linux/slab.h> 37 #include <linux/tty.h> 38 #include <linux/errno.h> 39 #include <linux/string.h> 40 #include <linux/signal.h> 41 #include <linux/ioctl.h> 42 #include <linux/skbuff.h> 43 44 #include <net/bluetooth/bluetooth.h> 45 #include <net/bluetooth/hci_core.h> 46 47 #include "hci_uart.h" 48 49 #define VERSION "1.2" 50 51 struct h4_struct { 52 unsigned long rx_state; 53 unsigned long rx_count; 54 struct sk_buff *rx_skb; 55 struct sk_buff_head txq; 56 }; 57 58 /* Initialize protocol */ 59 static int h4_open(struct hci_uart *hu) 60 { 61 struct h4_struct *h4; 62 63 BT_DBG("hu %p", hu); 64 65 h4 = kzalloc(sizeof(*h4), GFP_KERNEL); 66 if (!h4) 67 return -ENOMEM; 68 69 skb_queue_head_init(&h4->txq); 70 71 hu->priv = h4; 72 return 0; 73 } 74 75 /* Flush protocol data */ 76 static int h4_flush(struct hci_uart *hu) 77 { 78 struct h4_struct *h4 = hu->priv; 79 80 BT_DBG("hu %p", hu); 81 82 skb_queue_purge(&h4->txq); 83 84 return 0; 85 } 86 87 /* Close protocol */ 88 static int h4_close(struct hci_uart *hu) 89 { 90 struct h4_struct *h4 = hu->priv; 91 92 hu->priv = NULL; 93 94 BT_DBG("hu %p", hu); 95 96 skb_queue_purge(&h4->txq); 97 98 kfree_skb(h4->rx_skb); 99 100 hu->priv = NULL; 101 kfree(h4); 102 103 return 0; 104 } 105 106 /* Enqueue frame for transmittion (padding, crc, etc) */ 107 static int h4_enqueue(struct hci_uart *hu, struct sk_buff *skb) 108 { 109 struct h4_struct *h4 = hu->priv; 110 111 BT_DBG("hu %p skb %p", hu, skb); 112 113 /* Prepend skb with frame type */ 114 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); 115 skb_queue_tail(&h4->txq, skb); 116 117 return 0; 118 } 119 120 /* Recv data */ 121 static int h4_recv(struct hci_uart *hu, void *data, int count) 122 { 123 int ret; 124 125 if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) 126 return -EUNATCH; 127 128 ret = hci_recv_stream_fragment(hu->hdev, data, count); 129 if (ret < 0) { 130 BT_ERR("Frame Reassembly Failed"); 131 return ret; 132 } 133 134 return count; 135 } 136 137 static struct sk_buff *h4_dequeue(struct hci_uart *hu) 138 { 139 struct h4_struct *h4 = hu->priv; 140 return skb_dequeue(&h4->txq); 141 } 142 143 static struct hci_uart_proto h4p = { 144 .id = HCI_UART_H4, 145 .open = h4_open, 146 .close = h4_close, 147 .recv = h4_recv, 148 .enqueue = h4_enqueue, 149 .dequeue = h4_dequeue, 150 .flush = h4_flush, 151 }; 152 153 int __init h4_init(void) 154 { 155 int err = hci_uart_register_proto(&h4p); 156 157 if (!err) 158 BT_INFO("HCI H4 protocol initialized"); 159 else 160 BT_ERR("HCI H4 protocol registration failed"); 161 162 return err; 163 } 164 165 int __exit h4_deinit(void) 166 { 167 return hci_uart_unregister_proto(&h4p); 168 } 169