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Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 | 2 | * |
0372a662 MH |
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 | * | |
1da177e4 | 24 | */ |
1da177e4 | 25 | |
1da177e4 LT |
26 | #include <linux/module.h> |
27 | ||
28 | #include <linux/kernel.h> | |
29 | #include <linux/init.h> | |
1da177e4 LT |
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> | |
0372a662 | 46 | |
1da177e4 | 47 | #include "hci_uart.h" |
1da177e4 | 48 | |
0372a662 MH |
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 | ||
1da177e4 LT |
65 | /* Initialize protocol */ |
66 | static int h4_open(struct hci_uart *hu) | |
67 | { | |
68 | struct h4_struct *h4; | |
0372a662 | 69 | |
1da177e4 | 70 | BT_DBG("hu %p", hu); |
0372a662 | 71 | |
fdcd1661 | 72 | h4 = kzalloc(sizeof(*h4), GFP_KERNEL); |
1da177e4 LT |
73 | if (!h4) |
74 | return -ENOMEM; | |
0372a662 | 75 | |
1da177e4 LT |
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); | |
0372a662 | 88 | |
1da177e4 | 89 | skb_queue_purge(&h4->txq); |
0372a662 | 90 | |
1da177e4 LT |
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; | |
0372a662 | 98 | |
1da177e4 LT |
99 | hu->priv = NULL; |
100 | ||
101 | BT_DBG("hu %p", hu); | |
102 | ||
103 | skb_queue_purge(&h4->txq); | |
0372a662 | 104 | |
b1fb0683 | 105 | kfree_skb(h4->rx_skb); |
1da177e4 LT |
106 | |
107 | hu->priv = NULL; | |
108 | kfree(h4); | |
0372a662 | 109 | |
1da177e4 LT |
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 */ | |
0d48d939 | 121 | memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); |
1da177e4 | 122 | skb_queue_tail(&h4->txq, skb); |
0372a662 | 123 | |
1da177e4 LT |
124 | return 0; |
125 | } | |
126 | ||
127 | static inline int h4_check_data_len(struct h4_struct *h4, int len) | |
128 | { | |
129 | register int room = skb_tailroom(h4->rx_skb); | |
130 | ||
131 | BT_DBG("len %d room %d", len, room); | |
0372a662 | 132 | |
1da177e4 | 133 | if (!len) { |
1da177e4 LT |
134 | hci_recv_frame(h4->rx_skb); |
135 | } else if (len > room) { | |
136 | BT_ERR("Data length is too large"); | |
137 | kfree_skb(h4->rx_skb); | |
138 | } else { | |
139 | h4->rx_state = H4_W4_DATA; | |
140 | h4->rx_count = len; | |
141 | return len; | |
142 | } | |
143 | ||
144 | h4->rx_state = H4_W4_PACKET_TYPE; | |
145 | h4->rx_skb = NULL; | |
146 | h4->rx_count = 0; | |
0372a662 | 147 | |
1da177e4 LT |
148 | return 0; |
149 | } | |
150 | ||
151 | /* Recv data */ | |
152 | static int h4_recv(struct hci_uart *hu, void *data, int count) | |
153 | { | |
b86ed368 GP |
154 | int ret; |
155 | ||
156 | ret = hci_recv_stream_fragment(hu->hdev, data, count); | |
157 | if (ret < 0) { | |
e9da101f | 158 | BT_ERR("Frame Reassembly Failed"); |
b86ed368 GP |
159 | return ret; |
160 | } | |
0372a662 | 161 | |
1da177e4 LT |
162 | return count; |
163 | } | |
164 | ||
165 | static struct sk_buff *h4_dequeue(struct hci_uart *hu) | |
166 | { | |
167 | struct h4_struct *h4 = hu->priv; | |
168 | return skb_dequeue(&h4->txq); | |
169 | } | |
170 | ||
171 | static struct hci_uart_proto h4p = { | |
0372a662 MH |
172 | .id = HCI_UART_H4, |
173 | .open = h4_open, | |
174 | .close = h4_close, | |
175 | .recv = h4_recv, | |
176 | .enqueue = h4_enqueue, | |
177 | .dequeue = h4_dequeue, | |
178 | .flush = h4_flush, | |
1da177e4 | 179 | }; |
0372a662 | 180 | |
f2b94bb9 | 181 | int __init h4_init(void) |
1da177e4 LT |
182 | { |
183 | int err = hci_uart_register_proto(&h4p); | |
0372a662 | 184 | |
1da177e4 LT |
185 | if (!err) |
186 | BT_INFO("HCI H4 protocol initialized"); | |
187 | else | |
188 | BT_ERR("HCI H4 protocol registration failed"); | |
0372a662 | 189 | |
1da177e4 LT |
190 | return err; |
191 | } | |
192 | ||
f2b94bb9 | 193 | int __exit h4_deinit(void) |
1da177e4 LT |
194 | { |
195 | return hci_uart_unregister_proto(&h4p); | |
196 | } |