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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 LT |
25 | |
26 | #include <linux/config.h> | |
27 | #include <linux/module.h> | |
28 | ||
29 | #include <linux/kernel.h> | |
30 | #include <linux/init.h> | |
31 | #include <linux/sched.h> | |
32 | #include <linux/types.h> | |
33 | #include <linux/fcntl.h> | |
34 | #include <linux/interrupt.h> | |
35 | #include <linux/ptrace.h> | |
36 | #include <linux/poll.h> | |
37 | ||
38 | #include <linux/slab.h> | |
39 | #include <linux/tty.h> | |
40 | #include <linux/errno.h> | |
41 | #include <linux/string.h> | |
42 | #include <linux/signal.h> | |
43 | #include <linux/ioctl.h> | |
44 | #include <linux/skbuff.h> | |
45 | ||
46 | #include <net/bluetooth/bluetooth.h> | |
47 | #include <net/bluetooth/hci_core.h> | |
0372a662 | 48 | |
1da177e4 | 49 | #include "hci_uart.h" |
1da177e4 LT |
50 | |
51 | #ifndef CONFIG_BT_HCIUART_DEBUG | |
52 | #undef BT_DBG | |
53 | #define BT_DBG( A... ) | |
1da177e4 LT |
54 | #endif |
55 | ||
0372a662 MH |
56 | #define VERSION "1.2" |
57 | ||
58 | struct h4_struct { | |
59 | unsigned long rx_state; | |
60 | unsigned long rx_count; | |
61 | struct sk_buff *rx_skb; | |
62 | struct sk_buff_head txq; | |
63 | }; | |
64 | ||
65 | /* H4 receiver States */ | |
66 | #define H4_W4_PACKET_TYPE 0 | |
67 | #define H4_W4_EVENT_HDR 1 | |
68 | #define H4_W4_ACL_HDR 2 | |
69 | #define H4_W4_SCO_HDR 3 | |
70 | #define H4_W4_DATA 4 | |
71 | ||
1da177e4 LT |
72 | /* Initialize protocol */ |
73 | static int h4_open(struct hci_uart *hu) | |
74 | { | |
75 | struct h4_struct *h4; | |
0372a662 | 76 | |
1da177e4 | 77 | BT_DBG("hu %p", hu); |
0372a662 | 78 | |
089b1dbb | 79 | h4 = kzalloc(sizeof(*h4), GFP_ATOMIC); |
1da177e4 LT |
80 | if (!h4) |
81 | return -ENOMEM; | |
0372a662 | 82 | |
1da177e4 LT |
83 | skb_queue_head_init(&h4->txq); |
84 | ||
85 | hu->priv = h4; | |
86 | return 0; | |
87 | } | |
88 | ||
89 | /* Flush protocol data */ | |
90 | static int h4_flush(struct hci_uart *hu) | |
91 | { | |
92 | struct h4_struct *h4 = hu->priv; | |
93 | ||
94 | BT_DBG("hu %p", hu); | |
0372a662 | 95 | |
1da177e4 | 96 | skb_queue_purge(&h4->txq); |
0372a662 | 97 | |
1da177e4 LT |
98 | return 0; |
99 | } | |
100 | ||
101 | /* Close protocol */ | |
102 | static int h4_close(struct hci_uart *hu) | |
103 | { | |
104 | struct h4_struct *h4 = hu->priv; | |
0372a662 | 105 | |
1da177e4 LT |
106 | hu->priv = NULL; |
107 | ||
108 | BT_DBG("hu %p", hu); | |
109 | ||
110 | skb_queue_purge(&h4->txq); | |
0372a662 | 111 | |
1da177e4 LT |
112 | if (h4->rx_skb) |
113 | kfree_skb(h4->rx_skb); | |
114 | ||
115 | hu->priv = NULL; | |
116 | kfree(h4); | |
0372a662 | 117 | |
1da177e4 LT |
118 | return 0; |
119 | } | |
120 | ||
121 | /* Enqueue frame for transmittion (padding, crc, etc) */ | |
122 | static int h4_enqueue(struct hci_uart *hu, struct sk_buff *skb) | |
123 | { | |
124 | struct h4_struct *h4 = hu->priv; | |
125 | ||
126 | BT_DBG("hu %p skb %p", hu, skb); | |
127 | ||
128 | /* Prepend skb with frame type */ | |
0d48d939 | 129 | memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); |
1da177e4 | 130 | skb_queue_tail(&h4->txq, skb); |
0372a662 | 131 | |
1da177e4 LT |
132 | return 0; |
133 | } | |
134 | ||
135 | static inline int h4_check_data_len(struct h4_struct *h4, int len) | |
136 | { | |
137 | register int room = skb_tailroom(h4->rx_skb); | |
138 | ||
139 | BT_DBG("len %d room %d", len, room); | |
0372a662 | 140 | |
1da177e4 | 141 | if (!len) { |
1da177e4 LT |
142 | hci_recv_frame(h4->rx_skb); |
143 | } else if (len > room) { | |
144 | BT_ERR("Data length is too large"); | |
145 | kfree_skb(h4->rx_skb); | |
146 | } else { | |
147 | h4->rx_state = H4_W4_DATA; | |
148 | h4->rx_count = len; | |
149 | return len; | |
150 | } | |
151 | ||
152 | h4->rx_state = H4_W4_PACKET_TYPE; | |
153 | h4->rx_skb = NULL; | |
154 | h4->rx_count = 0; | |
0372a662 | 155 | |
1da177e4 LT |
156 | return 0; |
157 | } | |
158 | ||
159 | /* Recv data */ | |
160 | static int h4_recv(struct hci_uart *hu, void *data, int count) | |
161 | { | |
162 | struct h4_struct *h4 = hu->priv; | |
163 | register char *ptr; | |
164 | struct hci_event_hdr *eh; | |
165 | struct hci_acl_hdr *ah; | |
166 | struct hci_sco_hdr *sh; | |
167 | register int len, type, dlen; | |
168 | ||
169 | BT_DBG("hu %p count %d rx_state %ld rx_count %ld", | |
170 | hu, count, h4->rx_state, h4->rx_count); | |
171 | ||
172 | ptr = data; | |
173 | while (count) { | |
174 | if (h4->rx_count) { | |
175 | len = min_t(unsigned int, h4->rx_count, count); | |
176 | memcpy(skb_put(h4->rx_skb, len), ptr, len); | |
177 | h4->rx_count -= len; count -= len; ptr += len; | |
178 | ||
179 | if (h4->rx_count) | |
180 | continue; | |
181 | ||
182 | switch (h4->rx_state) { | |
183 | case H4_W4_DATA: | |
184 | BT_DBG("Complete data"); | |
185 | ||
1da177e4 LT |
186 | hci_recv_frame(h4->rx_skb); |
187 | ||
188 | h4->rx_state = H4_W4_PACKET_TYPE; | |
189 | h4->rx_skb = NULL; | |
190 | continue; | |
191 | ||
192 | case H4_W4_EVENT_HDR: | |
193 | eh = (struct hci_event_hdr *) h4->rx_skb->data; | |
194 | ||
195 | BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen); | |
196 | ||
197 | h4_check_data_len(h4, eh->plen); | |
198 | continue; | |
199 | ||
200 | case H4_W4_ACL_HDR: | |
201 | ah = (struct hci_acl_hdr *) h4->rx_skb->data; | |
202 | dlen = __le16_to_cpu(ah->dlen); | |
203 | ||
204 | BT_DBG("ACL header: dlen %d", dlen); | |
205 | ||
206 | h4_check_data_len(h4, dlen); | |
207 | continue; | |
208 | ||
209 | case H4_W4_SCO_HDR: | |
210 | sh = (struct hci_sco_hdr *) h4->rx_skb->data; | |
211 | ||
212 | BT_DBG("SCO header: dlen %d", sh->dlen); | |
213 | ||
214 | h4_check_data_len(h4, sh->dlen); | |
215 | continue; | |
216 | } | |
217 | } | |
218 | ||
219 | /* H4_W4_PACKET_TYPE */ | |
220 | switch (*ptr) { | |
221 | case HCI_EVENT_PKT: | |
222 | BT_DBG("Event packet"); | |
223 | h4->rx_state = H4_W4_EVENT_HDR; | |
224 | h4->rx_count = HCI_EVENT_HDR_SIZE; | |
225 | type = HCI_EVENT_PKT; | |
226 | break; | |
227 | ||
228 | case HCI_ACLDATA_PKT: | |
229 | BT_DBG("ACL packet"); | |
230 | h4->rx_state = H4_W4_ACL_HDR; | |
231 | h4->rx_count = HCI_ACL_HDR_SIZE; | |
232 | type = HCI_ACLDATA_PKT; | |
233 | break; | |
234 | ||
235 | case HCI_SCODATA_PKT: | |
236 | BT_DBG("SCO packet"); | |
237 | h4->rx_state = H4_W4_SCO_HDR; | |
238 | h4->rx_count = HCI_SCO_HDR_SIZE; | |
239 | type = HCI_SCODATA_PKT; | |
240 | break; | |
241 | ||
242 | default: | |
243 | BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr); | |
244 | hu->hdev->stat.err_rx++; | |
245 | ptr++; count--; | |
246 | continue; | |
247 | }; | |
0372a662 | 248 | |
1da177e4 LT |
249 | ptr++; count--; |
250 | ||
251 | /* Allocate packet */ | |
252 | h4->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC); | |
253 | if (!h4->rx_skb) { | |
254 | BT_ERR("Can't allocate mem for new packet"); | |
255 | h4->rx_state = H4_W4_PACKET_TYPE; | |
256 | h4->rx_count = 0; | |
257 | return 0; | |
258 | } | |
0372a662 | 259 | |
1da177e4 | 260 | h4->rx_skb->dev = (void *) hu->hdev; |
0d48d939 | 261 | bt_cb(h4->rx_skb)->pkt_type = type; |
1da177e4 | 262 | } |
0372a662 | 263 | |
1da177e4 LT |
264 | return count; |
265 | } | |
266 | ||
267 | static struct sk_buff *h4_dequeue(struct hci_uart *hu) | |
268 | { | |
269 | struct h4_struct *h4 = hu->priv; | |
270 | return skb_dequeue(&h4->txq); | |
271 | } | |
272 | ||
273 | static struct hci_uart_proto h4p = { | |
0372a662 MH |
274 | .id = HCI_UART_H4, |
275 | .open = h4_open, | |
276 | .close = h4_close, | |
277 | .recv = h4_recv, | |
278 | .enqueue = h4_enqueue, | |
279 | .dequeue = h4_dequeue, | |
280 | .flush = h4_flush, | |
1da177e4 | 281 | }; |
0372a662 | 282 | |
1da177e4 LT |
283 | int h4_init(void) |
284 | { | |
285 | int err = hci_uart_register_proto(&h4p); | |
0372a662 | 286 | |
1da177e4 LT |
287 | if (!err) |
288 | BT_INFO("HCI H4 protocol initialized"); | |
289 | else | |
290 | BT_ERR("HCI H4 protocol registration failed"); | |
0372a662 | 291 | |
1da177e4 LT |
292 | return err; |
293 | } | |
294 | ||
295 | int h4_deinit(void) | |
296 | { | |
297 | return hci_uart_unregister_proto(&h4p); | |
298 | } |