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 struct sk_buff *rx_skb; 53 struct sk_buff_head txq; 54 }; 55 56 /* Initialize protocol */ 57 static int h4_open(struct hci_uart *hu) 58 { 59 struct h4_struct *h4; 60 61 BT_DBG("hu %p", hu); 62 63 h4 = kzalloc(sizeof(*h4), GFP_KERNEL); 64 if (!h4) 65 return -ENOMEM; 66 67 skb_queue_head_init(&h4->txq); 68 69 hu->priv = h4; 70 return 0; 71 } 72 73 /* Flush protocol data */ 74 static int h4_flush(struct hci_uart *hu) 75 { 76 struct h4_struct *h4 = hu->priv; 77 78 BT_DBG("hu %p", hu); 79 80 skb_queue_purge(&h4->txq); 81 82 return 0; 83 } 84 85 /* Close protocol */ 86 static int h4_close(struct hci_uart *hu) 87 { 88 struct h4_struct *h4 = hu->priv; 89 90 hu->priv = NULL; 91 92 BT_DBG("hu %p", hu); 93 94 skb_queue_purge(&h4->txq); 95 96 kfree_skb(h4->rx_skb); 97 98 hu->priv = NULL; 99 kfree(h4); 100 101 return 0; 102 } 103 104 /* Enqueue frame for transmittion (padding, crc, etc) */ 105 static int h4_enqueue(struct hci_uart *hu, struct sk_buff *skb) 106 { 107 struct h4_struct *h4 = hu->priv; 108 109 BT_DBG("hu %p skb %p", hu, skb); 110 111 /* Prepend skb with frame type */ 112 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); 113 skb_queue_tail(&h4->txq, skb); 114 115 return 0; 116 } 117 118 /* Recv data */ 119 static int h4_recv(struct hci_uart *hu, const void *data, int count) 120 { 121 struct h4_struct *h4 = hu->priv; 122 123 if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) 124 return -EUNATCH; 125 126 h4->rx_skb = h4_recv_buf(hu->hdev, h4->rx_skb, data, count); 127 if (IS_ERR(h4->rx_skb)) { 128 int err = PTR_ERR(h4->rx_skb); 129 BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err); 130 return err; 131 } 132 133 return count; 134 } 135 136 static struct sk_buff *h4_dequeue(struct hci_uart *hu) 137 { 138 struct h4_struct *h4 = hu->priv; 139 return skb_dequeue(&h4->txq); 140 } 141 142 static const struct hci_uart_proto h4p = { 143 .id = HCI_UART_H4, 144 .open = h4_open, 145 .close = h4_close, 146 .recv = h4_recv, 147 .enqueue = h4_enqueue, 148 .dequeue = h4_dequeue, 149 .flush = h4_flush, 150 }; 151 152 int __init h4_init(void) 153 { 154 int err = hci_uart_register_proto(&h4p); 155 156 if (!err) 157 BT_INFO("HCI H4 protocol initialized"); 158 else 159 BT_ERR("HCI H4 protocol registration failed"); 160 161 return err; 162 } 163 164 int __exit h4_deinit(void) 165 { 166 return hci_uart_unregister_proto(&h4p); 167 } 168 169 struct sk_buff *h4_recv_buf(struct hci_dev *hdev, struct sk_buff *skb, 170 const unsigned char *buffer, int count) 171 { 172 while (count) { 173 int len; 174 175 if (!skb) { 176 switch (buffer[0]) { 177 case HCI_ACLDATA_PKT: 178 skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, 179 GFP_ATOMIC); 180 if (!skb) 181 return ERR_PTR(-ENOMEM); 182 183 bt_cb(skb)->pkt_type = HCI_ACLDATA_PKT; 184 bt_cb(skb)->expect = HCI_ACL_HDR_SIZE; 185 break; 186 case HCI_SCODATA_PKT: 187 skb = bt_skb_alloc(HCI_MAX_SCO_SIZE, 188 GFP_ATOMIC); 189 if (!skb) 190 return ERR_PTR(-ENOMEM); 191 192 bt_cb(skb)->pkt_type = HCI_SCODATA_PKT; 193 bt_cb(skb)->expect = HCI_SCO_HDR_SIZE; 194 break; 195 case HCI_EVENT_PKT: 196 skb = bt_skb_alloc(HCI_MAX_EVENT_SIZE, 197 GFP_ATOMIC); 198 if (!skb) 199 return ERR_PTR(-ENOMEM); 200 201 bt_cb(skb)->pkt_type = HCI_EVENT_PKT; 202 bt_cb(skb)->expect = HCI_EVENT_HDR_SIZE; 203 break; 204 default: 205 return ERR_PTR(-EILSEQ); 206 } 207 208 count -= 1; 209 buffer += 1; 210 } 211 212 len = min_t(uint, bt_cb(skb)->expect, count); 213 memcpy(skb_put(skb, len), buffer, len); 214 215 count -= len; 216 buffer += len; 217 bt_cb(skb)->expect -= len; 218 219 switch (bt_cb(skb)->pkt_type) { 220 case HCI_ACLDATA_PKT: 221 if (skb->len == HCI_ACL_HDR_SIZE) { 222 __le16 dlen = hci_acl_hdr(skb)->dlen; 223 224 /* Complete ACL header */ 225 bt_cb(skb)->expect = __le16_to_cpu(dlen); 226 227 if (skb_tailroom(skb) < bt_cb(skb)->expect) { 228 kfree_skb(skb); 229 return ERR_PTR(-EMSGSIZE); 230 } 231 } 232 break; 233 case HCI_SCODATA_PKT: 234 if (skb->len == HCI_SCO_HDR_SIZE) { 235 /* Complete SCO header */ 236 bt_cb(skb)->expect = hci_sco_hdr(skb)->dlen; 237 238 if (skb_tailroom(skb) < bt_cb(skb)->expect) { 239 kfree_skb(skb); 240 return ERR_PTR(-EMSGSIZE); 241 } 242 } 243 break; 244 case HCI_EVENT_PKT: 245 if (skb->len == HCI_EVENT_HDR_SIZE) { 246 /* Complete event header */ 247 bt_cb(skb)->expect = hci_event_hdr(skb)->plen; 248 249 if (skb_tailroom(skb) < bt_cb(skb)->expect) { 250 kfree_skb(skb); 251 return ERR_PTR(-EMSGSIZE); 252 } 253 } 254 break; 255 } 256 257 if (bt_cb(skb)->expect == 0) { 258 /* Complete frame */ 259 hci_recv_frame(hdev, skb); 260 skb = NULL; 261 } 262 } 263 264 return skb; 265 } 266