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 /* H4 receiver States */ 59 #define H4_W4_PACKET_TYPE 0 60 #define H4_W4_EVENT_HDR 1 61 #define H4_W4_ACL_HDR 2 62 #define H4_W4_SCO_HDR 3 63 #define H4_W4_DATA 4 64 65 /* Initialize protocol */ 66 static int h4_open(struct hci_uart *hu) 67 { 68 struct h4_struct *h4; 69 70 BT_DBG("hu %p", hu); 71 72 h4 = kzalloc(sizeof(*h4), GFP_KERNEL); 73 if (!h4) 74 return -ENOMEM; 75 76 skb_queue_head_init(&h4->txq); 77 78 hu->priv = h4; 79 return 0; 80 } 81 82 /* Flush protocol data */ 83 static int h4_flush(struct hci_uart *hu) 84 { 85 struct h4_struct *h4 = hu->priv; 86 87 BT_DBG("hu %p", hu); 88 89 skb_queue_purge(&h4->txq); 90 91 return 0; 92 } 93 94 /* Close protocol */ 95 static int h4_close(struct hci_uart *hu) 96 { 97 struct h4_struct *h4 = hu->priv; 98 99 hu->priv = NULL; 100 101 BT_DBG("hu %p", hu); 102 103 skb_queue_purge(&h4->txq); 104 105 kfree_skb(h4->rx_skb); 106 107 hu->priv = NULL; 108 kfree(h4); 109 110 return 0; 111 } 112 113 /* Enqueue frame for transmittion (padding, crc, etc) */ 114 static int h4_enqueue(struct hci_uart *hu, struct sk_buff *skb) 115 { 116 struct h4_struct *h4 = hu->priv; 117 118 BT_DBG("hu %p skb %p", hu, skb); 119 120 /* Prepend skb with frame type */ 121 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); 122 skb_queue_tail(&h4->txq, skb); 123 124 return 0; 125 } 126 127 /* Recv data */ 128 static int h4_recv(struct hci_uart *hu, void *data, int count) 129 { 130 int ret; 131 132 if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) 133 return -EUNATCH; 134 135 ret = hci_recv_stream_fragment(hu->hdev, data, count); 136 if (ret < 0) { 137 BT_ERR("Frame Reassembly Failed"); 138 return ret; 139 } 140 141 return count; 142 } 143 144 static struct sk_buff *h4_dequeue(struct hci_uart *hu) 145 { 146 struct h4_struct *h4 = hu->priv; 147 return skb_dequeue(&h4->txq); 148 } 149 150 static struct hci_uart_proto h4p = { 151 .id = HCI_UART_H4, 152 .open = h4_open, 153 .close = h4_close, 154 .recv = h4_recv, 155 .enqueue = h4_enqueue, 156 .dequeue = h4_dequeue, 157 .flush = h4_flush, 158 }; 159 160 int __init h4_init(void) 161 { 162 int err = hci_uart_register_proto(&h4p); 163 164 if (!err) 165 BT_INFO("HCI H4 protocol initialized"); 166 else 167 BT_ERR("HCI H4 protocol registration failed"); 168 169 return err; 170 } 171 172 int __exit h4_deinit(void) 173 { 174 return hci_uart_unregister_proto(&h4p); 175 } 176