drivers/bluetooth/hci_h4.c

   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 }