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 */
h4_open(struct hci_uart * hu)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 */
h4_flush(struct hci_uart * hu)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 */
h4_close(struct hci_uart * hu)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) */
h4_enqueue(struct hci_uart * hu,struct sk_buff * skb)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 */
h4_recv(struct hci_uart * hu,void * data,int count)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
h4_dequeue(struct hci_uart * hu)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
h4_init(void)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
h4_deinit(void)165 int __exit h4_deinit(void)
166 {
167 return hci_uart_unregister_proto(&h4p);
168 }
169