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 #include <linux/kernel.h>
28 #include <linux/init.h>
29 #include <linux/types.h>
30 #include <linux/fcntl.h>
31 #include <linux/interrupt.h>
32 #include <linux/ptrace.h>
33 #include <linux/poll.h>
34 #include <linux/slab.h>
35 #include <linux/tty.h>
36 #include <linux/errno.h>
37 #include <linux/string.h>
38 #include <linux/signal.h>
39 #include <linux/ioctl.h>
40 #include <linux/skbuff.h>
41 #include <net/bluetooth/bluetooth.h>
42 #include <net/bluetooth/hci_core.h>
43 #include <linux/version.h>
44
45 #include "hci_uart.h"
46
47 #ifdef BTCOEX
48 #include "rtk_coex.h"
49 #endif
50
51 //#define VERSION "1.2"
52
53 struct h4_struct {
54 unsigned long rx_state;
55 unsigned long rx_count;
56 struct sk_buff *rx_skb;
57 struct sk_buff_head txq;
58 };
59
60 /* H4 receiver States */
61 #define H4_W4_PACKET_TYPE 0
62 #define H4_W4_EVENT_HDR 1
63 #define H4_W4_ACL_HDR 2
64 #define H4_W4_SCO_HDR 3
65 #define H4_W4_DATA 4
66
67 /* Initialize protocol */
h4_open(struct hci_uart * hu)68 static int h4_open(struct hci_uart *hu)
69 {
70 struct h4_struct *h4;
71
72 BT_DBG("hu %p", hu);
73
74 h4 = kzalloc(sizeof(*h4), GFP_ATOMIC);
75 if (!h4)
76 return -ENOMEM;
77
78 skb_queue_head_init(&h4->txq);
79
80 hu->priv = h4;
81 return 0;
82 }
83
84 /* Flush protocol data */
h4_flush(struct hci_uart * hu)85 static int h4_flush(struct hci_uart *hu)
86 {
87 struct h4_struct *h4 = hu->priv;
88
89 BT_DBG("hu %p", hu);
90
91 skb_queue_purge(&h4->txq);
92
93 return 0;
94 }
95
96 /* Close protocol */
h4_close(struct hci_uart * hu)97 static int h4_close(struct hci_uart *hu)
98 {
99 struct h4_struct *h4 = hu->priv;
100
101 hu->priv = NULL;
102
103 BT_DBG("hu %p", hu);
104
105 skb_queue_purge(&h4->txq);
106
107 kfree_skb(h4->rx_skb);
108
109 hu->priv = NULL;
110 kfree(h4);
111
112 return 0;
113 }
114
115 /* Enqueue frame for transmittion (padding, crc, etc) */
h4_enqueue(struct hci_uart * hu,struct sk_buff * skb)116 static int h4_enqueue(struct hci_uart *hu, struct sk_buff *skb)
117 {
118 struct h4_struct *h4 = hu->priv;
119
120 BT_DBG("hu %p skb %p", hu, skb);
121
122 /* Prepend skb with frame type */
123 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
124 skb_queue_tail(&h4->txq, skb);
125
126 return 0;
127 }
128
129 #if HCI_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
h4_check_data_len(struct h4_struct * h4,int len)130 static inline int h4_check_data_len(struct h4_struct *h4, int len)
131 #else
132 static inline int h4_check_data_len(struct hci_dev *hdev, struct h4_struct *h4, int len)
133 #endif
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 #if HCI_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
141 hci_recv_frame(h4->rx_skb);
142 #else
143 hci_recv_frame(hdev, h4->rx_skb);
144 #endif
145 } else if (len > room) {
146 BT_ERR("Data length is too large");
147 kfree_skb(h4->rx_skb);
148 } else {
149 h4->rx_state = H4_W4_DATA;
150 h4->rx_count = len;
151 return len;
152 }
153
154 h4->rx_state = H4_W4_PACKET_TYPE;
155 h4->rx_skb = NULL;
156 h4->rx_count = 0;
157
158 return 0;
159 }
160
161 /* Recv data */
h4_recv(struct hci_uart * hu,void * data,int count)162 static int h4_recv(struct hci_uart *hu, void *data, int count)
163 {
164 struct h4_struct *h4 = hu->priv;
165 register char *ptr;
166 struct hci_event_hdr *eh;
167 struct hci_acl_hdr *ah;
168 struct hci_sco_hdr *sh;
169 register int len, type, dlen;
170
171 BT_DBG("hu %p count %d rx_state %ld rx_count %ld",
172 hu, count, h4->rx_state, h4->rx_count);
173
174 ptr = data;
175 while (count) {
176 if (h4->rx_count) {
177 len = min_t(unsigned int, h4->rx_count, count);
178 memcpy(skb_put(h4->rx_skb, len), ptr, len);
179 h4->rx_count -= len; count -= len; ptr += len;
180
181 if (h4->rx_count)
182 continue;
183
184 switch (h4->rx_state) {
185 case H4_W4_DATA:
186 BT_DBG("Complete data");
187 #ifdef BTCOEX
188 if(bt_cb(h4->rx_skb)->pkt_type == HCI_EVENT_PKT)
189 rtk_btcoex_parse_event(
190 h4->rx_skb->data,
191 h4->rx_skb->len);
192
193 if(bt_cb(h4->rx_skb)->pkt_type == HCI_ACLDATA_PKT)
194 rtk_btcoex_parse_l2cap_data_rx(
195 h4->rx_skb->data,
196 h4->rx_skb->len);
197 #endif
198
199 #if HCI_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
200 hci_recv_frame(h4->rx_skb);
201 #else
202 hci_recv_frame(hu->hdev, h4->rx_skb);
203 #endif
204
205 h4->rx_state = H4_W4_PACKET_TYPE;
206 h4->rx_skb = NULL;
207 continue;
208
209 case H4_W4_EVENT_HDR:
210 eh = hci_event_hdr(h4->rx_skb);
211
212 BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen);
213
214 #if HCI_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
215 h4_check_data_len(h4, eh->plen);
216 #else
217 h4_check_data_len(hu->hdev, h4, eh->plen);
218 #endif
219 continue;
220
221 case H4_W4_ACL_HDR:
222 ah = hci_acl_hdr(h4->rx_skb);
223 dlen = __le16_to_cpu(ah->dlen);
224
225 BT_DBG("ACL header: dlen %d", dlen);
226
227 #if HCI_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
228 h4_check_data_len(h4, dlen);
229 #else
230 h4_check_data_len(hu->hdev, h4, dlen);
231 #endif
232 continue;
233
234 case H4_W4_SCO_HDR:
235 sh = hci_sco_hdr(h4->rx_skb);
236
237 BT_DBG("SCO header: dlen %d", sh->dlen);
238
239 #if HCI_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
240 h4_check_data_len(h4, sh->dlen);
241 #else
242 h4_check_data_len(hu->hdev, h4, sh->dlen);
243 #endif
244 continue;
245 }
246 }
247
248 /* H4_W4_PACKET_TYPE */
249 switch (*ptr) {
250 case HCI_EVENT_PKT:
251 BT_DBG("Event packet");
252 h4->rx_state = H4_W4_EVENT_HDR;
253 h4->rx_count = HCI_EVENT_HDR_SIZE;
254 type = HCI_EVENT_PKT;
255 break;
256
257 case HCI_ACLDATA_PKT:
258 BT_DBG("ACL packet");
259 h4->rx_state = H4_W4_ACL_HDR;
260 h4->rx_count = HCI_ACL_HDR_SIZE;
261 type = HCI_ACLDATA_PKT;
262 break;
263
264 case HCI_SCODATA_PKT:
265 BT_DBG("SCO packet");
266 h4->rx_state = H4_W4_SCO_HDR;
267 h4->rx_count = HCI_SCO_HDR_SIZE;
268 type = HCI_SCODATA_PKT;
269 break;
270
271 default:
272 BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr);
273 hu->hdev->stat.err_rx++;
274 ptr++; count--;
275 continue;
276 };
277
278 ptr++; count--;
279
280 /* Allocate packet */
281 h4->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
282 if (!h4->rx_skb) {
283 BT_ERR("Can't allocate mem for new packet");
284 h4->rx_state = H4_W4_PACKET_TYPE;
285 h4->rx_count = 0;
286 return -ENOMEM;
287 }
288
289 h4->rx_skb->dev = (void *) hu->hdev;
290 bt_cb(h4->rx_skb)->pkt_type = type;
291 }
292
293 return count;
294 }
295
h4_dequeue(struct hci_uart * hu)296 static struct sk_buff *h4_dequeue(struct hci_uart *hu)
297 {
298 struct h4_struct *h4 = hu->priv;
299 return skb_dequeue(&h4->txq);
300 }
301
302 static struct hci_uart_proto h4p = {
303 .id = HCI_UART_H4,
304 .open = h4_open,
305 .close = h4_close,
306 .recv = h4_recv,
307 .enqueue = h4_enqueue,
308 .dequeue = h4_dequeue,
309 .flush = h4_flush,
310 };
311
h4_init(void)312 int __init h4_init(void)
313 {
314 int err = hci_uart_register_proto(&h4p);
315
316 if (!err)
317 BT_INFO("HCI H4 protocol initialized");
318 else
319 BT_ERR("HCI H4 protocol registration failed");
320
321 return err;
322 }
323
h4_deinit(void)324 int __exit h4_deinit(void)
325 {
326 return hci_uart_unregister_proto(&h4p);
327 }
328