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