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 /* 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
65 /* Initialize protocol */
66 static int h4_open(struct hci_uart *hu)
67 {
68 struct h4_struct *h4;
69
70 BT_DBG("hu %p", hu);
71
72 h4 = kzalloc(sizeof(*h4), GFP_ATOMIC);
73 if (!h4)
74 return -ENOMEM;
75
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);
88
89 skb_queue_purge(&h4->txq);
90
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;
98
99 hu->priv = NULL;
100
101 BT_DBG("hu %p", hu);
102
103 skb_queue_purge(&h4->txq);
104
105 kfree_skb(h4->rx_skb);
106
107 hu->priv = NULL;
108 kfree(h4);
109
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 */
121 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
122 skb_queue_tail(&h4->txq, skb);
123
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);
132
133 if (!len) {
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;
147
148 return 0;
149 }
150
151 /* Recv data */
152 static int h4_recv(struct hci_uart *hu, void *data, int count)
153 {
154 struct h4_struct *h4 = hu->priv;
155 register char *ptr;
156 struct hci_event_hdr *eh;
157 struct hci_acl_hdr *ah;
158 struct hci_sco_hdr *sh;
159 register int len, type, dlen;
160
161 BT_DBG("hu %p count %d rx_state %ld rx_count %ld",
162 hu, count, h4->rx_state, h4->rx_count);
163
164 ptr = data;
165 while (count) {
166 if (h4->rx_count) {
167 len = min_t(unsigned int, h4->rx_count, count);
168 memcpy(skb_put(h4->rx_skb, len), ptr, len);
169 h4->rx_count -= len; count -= len; ptr += len;
170
171 if (h4->rx_count)
172 continue;
173
174 switch (h4->rx_state) {
175 case H4_W4_DATA:
176 BT_DBG("Complete data");
177
178 hci_recv_frame(h4->rx_skb);
179
180 h4->rx_state = H4_W4_PACKET_TYPE;
181 h4->rx_skb = NULL;
182 continue;
183
184 case H4_W4_EVENT_HDR:
185 eh = hci_event_hdr(h4->rx_skb);
186
187 BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen);
188
189 h4_check_data_len(h4, eh->plen);
190 continue;
191
192 case H4_W4_ACL_HDR:
193 ah = hci_acl_hdr(h4->rx_skb);
194 dlen = __le16_to_cpu(ah->dlen);
195
196 BT_DBG("ACL header: dlen %d", dlen);
197
198 h4_check_data_len(h4, dlen);
199 continue;
200
201 case H4_W4_SCO_HDR:
202 sh = hci_sco_hdr(h4->rx_skb);
203
204 BT_DBG("SCO header: dlen %d", sh->dlen);
205
206 h4_check_data_len(h4, sh->dlen);
207 continue;
208 }
209 }
210
211 /* H4_W4_PACKET_TYPE */
212 switch (*ptr) {
213 case HCI_EVENT_PKT:
214 BT_DBG("Event packet");
215 h4->rx_state = H4_W4_EVENT_HDR;
216 h4->rx_count = HCI_EVENT_HDR_SIZE;
217 type = HCI_EVENT_PKT;
218 break;
219
220 case HCI_ACLDATA_PKT:
221 BT_DBG("ACL packet");
222 h4->rx_state = H4_W4_ACL_HDR;
223 h4->rx_count = HCI_ACL_HDR_SIZE;
224 type = HCI_ACLDATA_PKT;
225 break;
226
227 case HCI_SCODATA_PKT:
228 BT_DBG("SCO packet");
229 h4->rx_state = H4_W4_SCO_HDR;
230 h4->rx_count = HCI_SCO_HDR_SIZE;
231 type = HCI_SCODATA_PKT;
232 break;
233
234 default:
235 BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr);
236 hu->hdev->stat.err_rx++;
237 ptr++; count--;
238 continue;
239 };
240
241 ptr++; count--;
242
243 /* Allocate packet */
244 h4->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
245 if (!h4->rx_skb) {
246 BT_ERR("Can't allocate mem for new packet");
247 h4->rx_state = H4_W4_PACKET_TYPE;
248 h4->rx_count = 0;
249 return 0;
250 }
251
252 h4->rx_skb->dev = (void *) hu->hdev;
253 bt_cb(h4->rx_skb)->pkt_type = type;
254 }
255
256 return count;
257 }
258
259 static struct sk_buff *h4_dequeue(struct hci_uart *hu)
260 {
261 struct h4_struct *h4 = hu->priv;
262 return skb_dequeue(&h4->txq);
263 }
264
265 static struct hci_uart_proto h4p = {
266 .id = HCI_UART_H4,
267 .open = h4_open,
268 .close = h4_close,
269 .recv = h4_recv,
270 .enqueue = h4_enqueue,
271 .dequeue = h4_dequeue,
272 .flush = h4_flush,
273 };
274
275 int h4_init(void)
276 {
277 int err = hci_uart_register_proto(&h4p);
278
279 if (!err)
280 BT_INFO("HCI H4 protocol initialized");
281 else
282 BT_ERR("HCI H4 protocol registration failed");
283
284 return err;
285 }
286
287 int h4_deinit(void)
288 {
289 return hci_uart_unregister_proto(&h4p);
290 }
291
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