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1da177e4 LT |
1 | /* |
2 | BlueZ - Bluetooth protocol stack for Linux | |
3 | Copyright (C) 2000-2001 Qualcomm Incorporated | |
4 | ||
5 | Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License version 2 as | |
9 | published by the Free Software Foundation; | |
10 | ||
11 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | |
12 | OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
13 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. | |
14 | IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY | |
15 | CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES | |
16 | WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
17 | ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
18 | OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
19 | ||
20 | ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, | |
21 | COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS | |
22 | SOFTWARE IS DISCLAIMED. | |
23 | */ | |
24 | ||
25 | /* | |
26 | * Bluetooth HCI UART(H4) protocol. | |
27 | * | |
28 | * $Id: hci_h4.c,v 1.3 2002/09/09 01:17:32 maxk Exp $ | |
29 | */ | |
30 | #define VERSION "1.2" | |
31 | ||
32 | #include <linux/config.h> | |
33 | #include <linux/module.h> | |
34 | ||
35 | #include <linux/kernel.h> | |
36 | #include <linux/init.h> | |
37 | #include <linux/sched.h> | |
38 | #include <linux/types.h> | |
39 | #include <linux/fcntl.h> | |
40 | #include <linux/interrupt.h> | |
41 | #include <linux/ptrace.h> | |
42 | #include <linux/poll.h> | |
43 | ||
44 | #include <linux/slab.h> | |
45 | #include <linux/tty.h> | |
46 | #include <linux/errno.h> | |
47 | #include <linux/string.h> | |
48 | #include <linux/signal.h> | |
49 | #include <linux/ioctl.h> | |
50 | #include <linux/skbuff.h> | |
51 | ||
52 | #include <net/bluetooth/bluetooth.h> | |
53 | #include <net/bluetooth/hci_core.h> | |
54 | #include "hci_uart.h" | |
55 | #include "hci_h4.h" | |
56 | ||
57 | #ifndef CONFIG_BT_HCIUART_DEBUG | |
58 | #undef BT_DBG | |
59 | #define BT_DBG( A... ) | |
1da177e4 LT |
60 | #endif |
61 | ||
62 | /* Initialize protocol */ | |
63 | static int h4_open(struct hci_uart *hu) | |
64 | { | |
65 | struct h4_struct *h4; | |
66 | ||
67 | BT_DBG("hu %p", hu); | |
68 | ||
69 | h4 = kmalloc(sizeof(*h4), GFP_ATOMIC); | |
70 | if (!h4) | |
71 | return -ENOMEM; | |
72 | memset(h4, 0, sizeof(*h4)); | |
73 | ||
74 | skb_queue_head_init(&h4->txq); | |
75 | ||
76 | hu->priv = h4; | |
77 | return 0; | |
78 | } | |
79 | ||
80 | /* Flush protocol data */ | |
81 | static int h4_flush(struct hci_uart *hu) | |
82 | { | |
83 | struct h4_struct *h4 = hu->priv; | |
84 | ||
85 | BT_DBG("hu %p", hu); | |
86 | skb_queue_purge(&h4->txq); | |
87 | return 0; | |
88 | } | |
89 | ||
90 | /* Close protocol */ | |
91 | static int h4_close(struct hci_uart *hu) | |
92 | { | |
93 | struct h4_struct *h4 = hu->priv; | |
94 | hu->priv = NULL; | |
95 | ||
96 | BT_DBG("hu %p", hu); | |
97 | ||
98 | skb_queue_purge(&h4->txq); | |
99 | if (h4->rx_skb) | |
100 | kfree_skb(h4->rx_skb); | |
101 | ||
102 | hu->priv = NULL; | |
103 | kfree(h4); | |
104 | return 0; | |
105 | } | |
106 | ||
107 | /* Enqueue frame for transmittion (padding, crc, etc) */ | |
108 | static int h4_enqueue(struct hci_uart *hu, struct sk_buff *skb) | |
109 | { | |
110 | struct h4_struct *h4 = hu->priv; | |
111 | ||
112 | BT_DBG("hu %p skb %p", hu, skb); | |
113 | ||
114 | /* Prepend skb with frame type */ | |
115 | memcpy(skb_push(skb, 1), &skb->pkt_type, 1); | |
116 | skb_queue_tail(&h4->txq, skb); | |
117 | return 0; | |
118 | } | |
119 | ||
120 | static inline int h4_check_data_len(struct h4_struct *h4, int len) | |
121 | { | |
122 | register int room = skb_tailroom(h4->rx_skb); | |
123 | ||
124 | BT_DBG("len %d room %d", len, room); | |
125 | if (!len) { | |
1da177e4 LT |
126 | hci_recv_frame(h4->rx_skb); |
127 | } else if (len > room) { | |
128 | BT_ERR("Data length is too large"); | |
129 | kfree_skb(h4->rx_skb); | |
130 | } else { | |
131 | h4->rx_state = H4_W4_DATA; | |
132 | h4->rx_count = len; | |
133 | return len; | |
134 | } | |
135 | ||
136 | h4->rx_state = H4_W4_PACKET_TYPE; | |
137 | h4->rx_skb = NULL; | |
138 | h4->rx_count = 0; | |
139 | return 0; | |
140 | } | |
141 | ||
142 | /* Recv data */ | |
143 | static int h4_recv(struct hci_uart *hu, void *data, int count) | |
144 | { | |
145 | struct h4_struct *h4 = hu->priv; | |
146 | register char *ptr; | |
147 | struct hci_event_hdr *eh; | |
148 | struct hci_acl_hdr *ah; | |
149 | struct hci_sco_hdr *sh; | |
150 | register int len, type, dlen; | |
151 | ||
152 | BT_DBG("hu %p count %d rx_state %ld rx_count %ld", | |
153 | hu, count, h4->rx_state, h4->rx_count); | |
154 | ||
155 | ptr = data; | |
156 | while (count) { | |
157 | if (h4->rx_count) { | |
158 | len = min_t(unsigned int, h4->rx_count, count); | |
159 | memcpy(skb_put(h4->rx_skb, len), ptr, len); | |
160 | h4->rx_count -= len; count -= len; ptr += len; | |
161 | ||
162 | if (h4->rx_count) | |
163 | continue; | |
164 | ||
165 | switch (h4->rx_state) { | |
166 | case H4_W4_DATA: | |
167 | BT_DBG("Complete data"); | |
168 | ||
1da177e4 LT |
169 | hci_recv_frame(h4->rx_skb); |
170 | ||
171 | h4->rx_state = H4_W4_PACKET_TYPE; | |
172 | h4->rx_skb = NULL; | |
173 | continue; | |
174 | ||
175 | case H4_W4_EVENT_HDR: | |
176 | eh = (struct hci_event_hdr *) h4->rx_skb->data; | |
177 | ||
178 | BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen); | |
179 | ||
180 | h4_check_data_len(h4, eh->plen); | |
181 | continue; | |
182 | ||
183 | case H4_W4_ACL_HDR: | |
184 | ah = (struct hci_acl_hdr *) h4->rx_skb->data; | |
185 | dlen = __le16_to_cpu(ah->dlen); | |
186 | ||
187 | BT_DBG("ACL header: dlen %d", dlen); | |
188 | ||
189 | h4_check_data_len(h4, dlen); | |
190 | continue; | |
191 | ||
192 | case H4_W4_SCO_HDR: | |
193 | sh = (struct hci_sco_hdr *) h4->rx_skb->data; | |
194 | ||
195 | BT_DBG("SCO header: dlen %d", sh->dlen); | |
196 | ||
197 | h4_check_data_len(h4, sh->dlen); | |
198 | continue; | |
199 | } | |
200 | } | |
201 | ||
202 | /* H4_W4_PACKET_TYPE */ | |
203 | switch (*ptr) { | |
204 | case HCI_EVENT_PKT: | |
205 | BT_DBG("Event packet"); | |
206 | h4->rx_state = H4_W4_EVENT_HDR; | |
207 | h4->rx_count = HCI_EVENT_HDR_SIZE; | |
208 | type = HCI_EVENT_PKT; | |
209 | break; | |
210 | ||
211 | case HCI_ACLDATA_PKT: | |
212 | BT_DBG("ACL packet"); | |
213 | h4->rx_state = H4_W4_ACL_HDR; | |
214 | h4->rx_count = HCI_ACL_HDR_SIZE; | |
215 | type = HCI_ACLDATA_PKT; | |
216 | break; | |
217 | ||
218 | case HCI_SCODATA_PKT: | |
219 | BT_DBG("SCO packet"); | |
220 | h4->rx_state = H4_W4_SCO_HDR; | |
221 | h4->rx_count = HCI_SCO_HDR_SIZE; | |
222 | type = HCI_SCODATA_PKT; | |
223 | break; | |
224 | ||
225 | default: | |
226 | BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr); | |
227 | hu->hdev->stat.err_rx++; | |
228 | ptr++; count--; | |
229 | continue; | |
230 | }; | |
231 | ptr++; count--; | |
232 | ||
233 | /* Allocate packet */ | |
234 | h4->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC); | |
235 | if (!h4->rx_skb) { | |
236 | BT_ERR("Can't allocate mem for new packet"); | |
237 | h4->rx_state = H4_W4_PACKET_TYPE; | |
238 | h4->rx_count = 0; | |
239 | return 0; | |
240 | } | |
241 | h4->rx_skb->dev = (void *) hu->hdev; | |
242 | h4->rx_skb->pkt_type = type; | |
243 | } | |
244 | return count; | |
245 | } | |
246 | ||
247 | static struct sk_buff *h4_dequeue(struct hci_uart *hu) | |
248 | { | |
249 | struct h4_struct *h4 = hu->priv; | |
250 | return skb_dequeue(&h4->txq); | |
251 | } | |
252 | ||
253 | static struct hci_uart_proto h4p = { | |
254 | .id = HCI_UART_H4, | |
255 | .open = h4_open, | |
256 | .close = h4_close, | |
257 | .recv = h4_recv, | |
258 | .enqueue = h4_enqueue, | |
259 | .dequeue = h4_dequeue, | |
260 | .flush = h4_flush, | |
261 | }; | |
262 | ||
263 | int h4_init(void) | |
264 | { | |
265 | int err = hci_uart_register_proto(&h4p); | |
266 | if (!err) | |
267 | BT_INFO("HCI H4 protocol initialized"); | |
268 | else | |
269 | BT_ERR("HCI H4 protocol registration failed"); | |
270 | ||
271 | return err; | |
272 | } | |
273 | ||
274 | int h4_deinit(void) | |
275 | { | |
276 | return hci_uart_unregister_proto(&h4p); | |
277 | } |