xref: /openbmc/linux/drivers/bluetooth/hci_h4.c (revision 01009eec)
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 #define VERSION "1.2"
50 
51 struct h4_struct {
52 	struct sk_buff *rx_skb;
53 	struct sk_buff_head txq;
54 };
55 
56 /* Initialize protocol */
57 static int h4_open(struct hci_uart *hu)
58 {
59 	struct h4_struct *h4;
60 
61 	BT_DBG("hu %p", hu);
62 
63 	h4 = kzalloc(sizeof(*h4), GFP_KERNEL);
64 	if (!h4)
65 		return -ENOMEM;
66 
67 	skb_queue_head_init(&h4->txq);
68 
69 	hu->priv = h4;
70 	return 0;
71 }
72 
73 /* Flush protocol data */
74 static int h4_flush(struct hci_uart *hu)
75 {
76 	struct h4_struct *h4 = hu->priv;
77 
78 	BT_DBG("hu %p", hu);
79 
80 	skb_queue_purge(&h4->txq);
81 
82 	return 0;
83 }
84 
85 /* Close protocol */
86 static int h4_close(struct hci_uart *hu)
87 {
88 	struct h4_struct *h4 = hu->priv;
89 
90 	hu->priv = NULL;
91 
92 	BT_DBG("hu %p", hu);
93 
94 	skb_queue_purge(&h4->txq);
95 
96 	kfree_skb(h4->rx_skb);
97 
98 	hu->priv = NULL;
99 	kfree(h4);
100 
101 	return 0;
102 }
103 
104 /* Enqueue frame for transmittion (padding, crc, etc) */
105 static int h4_enqueue(struct hci_uart *hu, struct sk_buff *skb)
106 {
107 	struct h4_struct *h4 = hu->priv;
108 
109 	BT_DBG("hu %p skb %p", hu, skb);
110 
111 	/* Prepend skb with frame type */
112 	memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
113 	skb_queue_tail(&h4->txq, skb);
114 
115 	return 0;
116 }
117 
118 /* Recv data */
119 static int h4_recv(struct hci_uart *hu, const void *data, int count)
120 {
121 	struct h4_struct *h4 = hu->priv;
122 
123 	if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
124 		return -EUNATCH;
125 
126 	h4->rx_skb = h4_recv_buf(hu->hdev, h4->rx_skb, data, count);
127 	if (IS_ERR(h4->rx_skb)) {
128 		int err = PTR_ERR(h4->rx_skb);
129 		BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
130 		return err;
131 	}
132 
133 	return count;
134 }
135 
136 static struct sk_buff *h4_dequeue(struct hci_uart *hu)
137 {
138 	struct h4_struct *h4 = hu->priv;
139 	return skb_dequeue(&h4->txq);
140 }
141 
142 static const struct hci_uart_proto h4p = {
143 	.id		= HCI_UART_H4,
144 	.name		= "H4",
145 	.open		= h4_open,
146 	.close		= h4_close,
147 	.recv		= h4_recv,
148 	.enqueue	= h4_enqueue,
149 	.dequeue	= h4_dequeue,
150 	.flush		= h4_flush,
151 };
152 
153 int __init h4_init(void)
154 {
155 	return hci_uart_register_proto(&h4p);
156 }
157 
158 int __exit h4_deinit(void)
159 {
160 	return hci_uart_unregister_proto(&h4p);
161 }
162 
163 struct sk_buff *h4_recv_buf(struct hci_dev *hdev, struct sk_buff *skb,
164 			    const unsigned char *buffer, int count)
165 {
166 	while (count) {
167 		int len;
168 
169 		if (!skb) {
170 			switch (buffer[0]) {
171 			case HCI_ACLDATA_PKT:
172 				skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE,
173 						   GFP_ATOMIC);
174 				if (!skb)
175 					return ERR_PTR(-ENOMEM);
176 
177 				bt_cb(skb)->pkt_type = HCI_ACLDATA_PKT;
178 				bt_cb(skb)->expect = HCI_ACL_HDR_SIZE;
179 				break;
180 			case HCI_SCODATA_PKT:
181 				skb = bt_skb_alloc(HCI_MAX_SCO_SIZE,
182 						   GFP_ATOMIC);
183 				if (!skb)
184 					return ERR_PTR(-ENOMEM);
185 
186 				bt_cb(skb)->pkt_type = HCI_SCODATA_PKT;
187 				bt_cb(skb)->expect = HCI_SCO_HDR_SIZE;
188 				break;
189 			case HCI_EVENT_PKT:
190 				skb = bt_skb_alloc(HCI_MAX_EVENT_SIZE,
191 						   GFP_ATOMIC);
192 				if (!skb)
193 					return ERR_PTR(-ENOMEM);
194 
195 				bt_cb(skb)->pkt_type = HCI_EVENT_PKT;
196 				bt_cb(skb)->expect = HCI_EVENT_HDR_SIZE;
197 				break;
198 			default:
199 				return ERR_PTR(-EILSEQ);
200 			}
201 
202 			count -= 1;
203 			buffer += 1;
204 		}
205 
206 		len = min_t(uint, bt_cb(skb)->expect, count);
207 		memcpy(skb_put(skb, len), buffer, len);
208 
209 		count -= len;
210 		buffer += len;
211 		bt_cb(skb)->expect -= len;
212 
213 		switch (bt_cb(skb)->pkt_type) {
214 		case HCI_ACLDATA_PKT:
215 			if (skb->len == HCI_ACL_HDR_SIZE) {
216 				__le16 dlen = hci_acl_hdr(skb)->dlen;
217 
218 				/* Complete ACL header */
219 				bt_cb(skb)->expect = __le16_to_cpu(dlen);
220 
221 				if (skb_tailroom(skb) < bt_cb(skb)->expect) {
222 					kfree_skb(skb);
223 					return ERR_PTR(-EMSGSIZE);
224 				}
225 			}
226 			break;
227 		case HCI_SCODATA_PKT:
228 			if (skb->len == HCI_SCO_HDR_SIZE) {
229 				/* Complete SCO header */
230 				bt_cb(skb)->expect = hci_sco_hdr(skb)->dlen;
231 
232 				if (skb_tailroom(skb) < bt_cb(skb)->expect) {
233 					kfree_skb(skb);
234 					return ERR_PTR(-EMSGSIZE);
235 				}
236 			}
237 			break;
238 		case HCI_EVENT_PKT:
239 			if (skb->len == HCI_EVENT_HDR_SIZE) {
240 				/* Complete event header */
241 				bt_cb(skb)->expect = hci_event_hdr(skb)->plen;
242 
243 				if (skb_tailroom(skb) < bt_cb(skb)->expect) {
244 					kfree_skb(skb);
245 					return ERR_PTR(-EMSGSIZE);
246 				}
247 			}
248 			break;
249 		}
250 
251 		if (bt_cb(skb)->expect == 0) {
252 			/* Complete frame */
253 			hci_recv_frame(hdev, skb);
254 			skb = NULL;
255 		}
256 	}
257 
258 	return skb;
259 }
260