[go: nahoru, domu]
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
51struct 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 */
59static 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 */
76static 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 */
88static 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) */
107static 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 */
121static 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
137static 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
143static 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
153int __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
165int __exit h4_deinit(void)
166{
167	return hci_uart_unregister_proto(&h4p);
168}
169