drivers/net: Trim trailing whitespace
[linux-2.6.git] / 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/sched.h>
31 #include <linux/types.h>
32 #include <linux/fcntl.h>
33 #include <linux/interrupt.h>
34 #include <linux/ptrace.h>
35 #include <linux/poll.h>
36
37 #include <linux/slab.h>
38 #include <linux/tty.h>
39 #include <linux/errno.h>
40 #include <linux/string.h>
41 #include <linux/signal.h>
42 #include <linux/ioctl.h>
43 #include <linux/skbuff.h>
44
45 #include <net/bluetooth/bluetooth.h>
46 #include <net/bluetooth/hci_core.h>
47
48 #include "hci_uart.h"
49
50 #ifndef CONFIG_BT_HCIUART_DEBUG
51 #undef  BT_DBG
52 #define BT_DBG( A... )
53 #endif
54
55 #define VERSION "1.2"
56
57 struct h4_struct {
58         unsigned long rx_state;
59         unsigned long rx_count;
60         struct sk_buff *rx_skb;
61         struct sk_buff_head txq;
62 };
63
64 /* H4 receiver States */
65 #define H4_W4_PACKET_TYPE       0
66 #define H4_W4_EVENT_HDR         1
67 #define H4_W4_ACL_HDR           2
68 #define H4_W4_SCO_HDR           3
69 #define H4_W4_DATA              4
70
71 /* Initialize protocol */
72 static int h4_open(struct hci_uart *hu)
73 {
74         struct h4_struct *h4;
75
76         BT_DBG("hu %p", hu);
77
78         h4 = kzalloc(sizeof(*h4), GFP_ATOMIC);
79         if (!h4)
80                 return -ENOMEM;
81
82         skb_queue_head_init(&h4->txq);
83
84         hu->priv = h4;
85         return 0;
86 }
87
88 /* Flush protocol data */
89 static int h4_flush(struct hci_uart *hu)
90 {
91         struct h4_struct *h4 = hu->priv;
92
93         BT_DBG("hu %p", hu);
94
95         skb_queue_purge(&h4->txq);
96
97         return 0;
98 }
99
100 /* Close protocol */
101 static int h4_close(struct hci_uart *hu)
102 {
103         struct h4_struct *h4 = hu->priv;
104
105         hu->priv = NULL;
106
107         BT_DBG("hu %p", hu);
108
109         skb_queue_purge(&h4->txq);
110
111         if (h4->rx_skb)
112                 kfree_skb(h4->rx_skb);
113
114         hu->priv = NULL;
115         kfree(h4);
116
117         return 0;
118 }
119
120 /* Enqueue frame for transmittion (padding, crc, etc) */
121 static int h4_enqueue(struct hci_uart *hu, struct sk_buff *skb)
122 {
123         struct h4_struct *h4 = hu->priv;
124
125         BT_DBG("hu %p skb %p", hu, skb);
126
127         /* Prepend skb with frame type */
128         memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
129         skb_queue_tail(&h4->txq, skb);
130
131         return 0;
132 }
133
134 static inline int h4_check_data_len(struct h4_struct *h4, int len)
135 {
136         register int room = skb_tailroom(h4->rx_skb);
137
138         BT_DBG("len %d room %d", len, room);
139
140         if (!len) {
141                 hci_recv_frame(h4->rx_skb);
142         } else if (len > room) {
143                 BT_ERR("Data length is too large");
144                 kfree_skb(h4->rx_skb);
145         } else {
146                 h4->rx_state = H4_W4_DATA;
147                 h4->rx_count = len;
148                 return len;
149         }
150
151         h4->rx_state = H4_W4_PACKET_TYPE;
152         h4->rx_skb   = NULL;
153         h4->rx_count = 0;
154
155         return 0;
156 }
157
158 /* Recv data */
159 static int h4_recv(struct hci_uart *hu, void *data, int count)
160 {
161         struct h4_struct *h4 = hu->priv;
162         register char *ptr;
163         struct hci_event_hdr *eh;
164         struct hci_acl_hdr   *ah;
165         struct hci_sco_hdr   *sh;
166         register int len, type, dlen;
167
168         BT_DBG("hu %p count %d rx_state %ld rx_count %ld", 
169                         hu, count, h4->rx_state, h4->rx_count);
170
171         ptr = data;
172         while (count) {
173                 if (h4->rx_count) {
174                         len = min_t(unsigned int, h4->rx_count, count);
175                         memcpy(skb_put(h4->rx_skb, len), ptr, len);
176                         h4->rx_count -= len; count -= len; ptr += len;
177
178                         if (h4->rx_count)
179                                 continue;
180
181                         switch (h4->rx_state) {
182                         case H4_W4_DATA:
183                                 BT_DBG("Complete data");
184
185                                 hci_recv_frame(h4->rx_skb);
186
187                                 h4->rx_state = H4_W4_PACKET_TYPE;
188                                 h4->rx_skb = NULL;
189                                 continue;
190
191                         case H4_W4_EVENT_HDR:
192                                 eh = (struct hci_event_hdr *) h4->rx_skb->data;
193
194                                 BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen);
195
196                                 h4_check_data_len(h4, eh->plen);
197                                 continue;
198
199                         case H4_W4_ACL_HDR:
200                                 ah = (struct hci_acl_hdr *) h4->rx_skb->data;
201                                 dlen = __le16_to_cpu(ah->dlen);
202
203                                 BT_DBG("ACL header: dlen %d", dlen);
204
205                                 h4_check_data_len(h4, dlen);
206                                 continue;
207
208                         case H4_W4_SCO_HDR:
209                                 sh = (struct hci_sco_hdr *) h4->rx_skb->data;
210
211                                 BT_DBG("SCO header: dlen %d", sh->dlen);
212
213                                 h4_check_data_len(h4, sh->dlen);
214                                 continue;
215                         }
216                 }
217
218                 /* H4_W4_PACKET_TYPE */
219                 switch (*ptr) {
220                 case HCI_EVENT_PKT:
221                         BT_DBG("Event packet");
222                         h4->rx_state = H4_W4_EVENT_HDR;
223                         h4->rx_count = HCI_EVENT_HDR_SIZE;
224                         type = HCI_EVENT_PKT;
225                         break;
226
227                 case HCI_ACLDATA_PKT:
228                         BT_DBG("ACL packet");
229                         h4->rx_state = H4_W4_ACL_HDR;
230                         h4->rx_count = HCI_ACL_HDR_SIZE;
231                         type = HCI_ACLDATA_PKT;
232                         break;
233
234                 case HCI_SCODATA_PKT:
235                         BT_DBG("SCO packet");
236                         h4->rx_state = H4_W4_SCO_HDR;
237                         h4->rx_count = HCI_SCO_HDR_SIZE;
238                         type = HCI_SCODATA_PKT;
239                         break;
240
241                 default:
242                         BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr);
243                         hu->hdev->stat.err_rx++;
244                         ptr++; count--;
245                         continue;
246                 };
247
248                 ptr++; count--;
249
250                 /* Allocate packet */
251                 h4->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
252                 if (!h4->rx_skb) {
253                         BT_ERR("Can't allocate mem for new packet");
254                         h4->rx_state = H4_W4_PACKET_TYPE;
255                         h4->rx_count = 0;
256                         return 0;
257                 }
258
259                 h4->rx_skb->dev = (void *) hu->hdev;
260                 bt_cb(h4->rx_skb)->pkt_type = type;
261         }
262
263         return count;
264 }
265
266 static struct sk_buff *h4_dequeue(struct hci_uart *hu)
267 {
268         struct h4_struct *h4 = hu->priv;
269         return skb_dequeue(&h4->txq);
270 }
271
272 static struct hci_uart_proto h4p = {
273         .id             = HCI_UART_H4,
274         .open           = h4_open,
275         .close          = h4_close,
276         .recv           = h4_recv,
277         .enqueue        = h4_enqueue,
278         .dequeue        = h4_dequeue,
279         .flush          = h4_flush,
280 };
281
282 int h4_init(void)
283 {
284         int err = hci_uart_register_proto(&h4p);
285
286         if (!err)
287                 BT_INFO("HCI H4 protocol initialized");
288         else
289                 BT_ERR("HCI H4 protocol registration failed");
290
291         return err;
292 }
293
294 int h4_deinit(void)
295 {
296         return hci_uart_unregister_proto(&h4p);
297 }