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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 *
Marcel Holtmann0372a662005-10-28 19:20:45 +02003 * 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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/module.h>
27
28#include <linux/kernel.h>
29#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#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>
Marcel Holtmann79b8df92015-04-05 23:44:59 -070043#include <asm/unaligned.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
45#include <net/bluetooth/bluetooth.h>
46#include <net/bluetooth/hci_core.h>
Marcel Holtmann0372a662005-10-28 19:20:45 +020047
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include "hci_uart.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Marcel Holtmann0372a662005-10-28 19:20:45 +020050struct h4_struct {
Marcel Holtmannc27799f2015-04-04 21:59:25 -070051 struct sk_buff *rx_skb;
Marcel Holtmann0372a662005-10-28 19:20:45 +020052 struct sk_buff_head txq;
53};
54
Linus Torvalds1da177e2005-04-16 15:20:36 -070055/* Initialize protocol */
56static int h4_open(struct hci_uart *hu)
57{
58 struct h4_struct *h4;
Marcel Holtmann0372a662005-10-28 19:20:45 +020059
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 BT_DBG("hu %p", hu);
Marcel Holtmann0372a662005-10-28 19:20:45 +020061
David Herrmannfdcd1662012-01-07 15:19:38 +010062 h4 = kzalloc(sizeof(*h4), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 if (!h4)
64 return -ENOMEM;
Marcel Holtmann0372a662005-10-28 19:20:45 +020065
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 skb_queue_head_init(&h4->txq);
67
68 hu->priv = h4;
69 return 0;
70}
71
72/* Flush protocol data */
73static int h4_flush(struct hci_uart *hu)
74{
75 struct h4_struct *h4 = hu->priv;
76
77 BT_DBG("hu %p", hu);
Marcel Holtmann0372a662005-10-28 19:20:45 +020078
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 skb_queue_purge(&h4->txq);
Marcel Holtmann0372a662005-10-28 19:20:45 +020080
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 return 0;
82}
83
84/* Close protocol */
85static int h4_close(struct hci_uart *hu)
86{
87 struct h4_struct *h4 = hu->priv;
Marcel Holtmann0372a662005-10-28 19:20:45 +020088
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 hu->priv = NULL;
90
91 BT_DBG("hu %p", hu);
92
93 skb_queue_purge(&h4->txq);
Marcel Holtmann0372a662005-10-28 19:20:45 +020094
Marcel Holtmannc27799f2015-04-04 21:59:25 -070095 kfree_skb(h4->rx_skb);
96
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 hu->priv = NULL;
98 kfree(h4);
Marcel Holtmann0372a662005-10-28 19:20:45 +020099
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 return 0;
101}
102
103/* Enqueue frame for transmittion (padding, crc, etc) */
104static int h4_enqueue(struct hci_uart *hu, struct sk_buff *skb)
105{
106 struct h4_struct *h4 = hu->priv;
107
108 BT_DBG("hu %p skb %p", hu, skb);
109
110 /* Prepend skb with frame type */
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700111 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 skb_queue_tail(&h4->txq, skb);
Marcel Holtmann0372a662005-10-28 19:20:45 +0200113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 return 0;
115}
116
Marcel Holtmann79b8df92015-04-05 23:44:59 -0700117static const struct h4_recv_pkt h4_recv_pkts[] = {
118 { H4_RECV_ACL, .recv = hci_recv_frame },
119 { H4_RECV_SCO, .recv = hci_recv_frame },
120 { H4_RECV_EVENT, .recv = hci_recv_frame },
121};
122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123/* Recv data */
Marcel Holtmann9d1c40e2015-04-04 20:59:41 -0700124static int h4_recv(struct hci_uart *hu, const void *data, int count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125{
Marcel Holtmannc27799f2015-04-04 21:59:25 -0700126 struct h4_struct *h4 = hu->priv;
Gustavo F. Padovanb86ed362011-04-07 18:53:45 -0300127
Chan-yeol Parkc2578202013-04-02 21:24:21 +0900128 if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
129 return -EUNATCH;
130
Marcel Holtmann79b8df92015-04-05 23:44:59 -0700131 h4->rx_skb = h4_recv_buf(hu->hdev, h4->rx_skb, data, count,
132 h4_recv_pkts, ARRAY_SIZE(h4_recv_pkts));
Marcel Holtmannc27799f2015-04-04 21:59:25 -0700133 if (IS_ERR(h4->rx_skb)) {
134 int err = PTR_ERR(h4->rx_skb);
135 BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
Chan-yeol Park37134162015-06-17 21:10:39 +0900136 h4->rx_skb = NULL;
Marcel Holtmannc27799f2015-04-04 21:59:25 -0700137 return err;
Gustavo F. Padovanb86ed362011-04-07 18:53:45 -0300138 }
Marcel Holtmann0372a662005-10-28 19:20:45 +0200139
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 return count;
141}
142
143static struct sk_buff *h4_dequeue(struct hci_uart *hu)
144{
145 struct h4_struct *h4 = hu->priv;
146 return skb_dequeue(&h4->txq);
147}
148
Marcel Holtmann4ee7ef12015-04-04 22:11:43 -0700149static const struct hci_uart_proto h4p = {
Marcel Holtmann0372a662005-10-28 19:20:45 +0200150 .id = HCI_UART_H4,
Marcel Holtmann7c40fb82015-04-04 22:27:34 -0700151 .name = "H4",
Marcel Holtmann0372a662005-10-28 19:20:45 +0200152 .open = h4_open,
153 .close = h4_close,
154 .recv = h4_recv,
155 .enqueue = h4_enqueue,
156 .dequeue = h4_dequeue,
157 .flush = h4_flush,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158};
Marcel Holtmann0372a662005-10-28 19:20:45 +0200159
Gustavo F. Padovanf2b94bb2010-07-24 02:04:44 -0300160int __init h4_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161{
Marcel Holtmann01009ee2015-04-04 22:27:35 -0700162 return hci_uart_register_proto(&h4p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163}
164
Gustavo F. Padovanf2b94bb2010-07-24 02:04:44 -0300165int __exit h4_deinit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166{
167 return hci_uart_unregister_proto(&h4p);
168}
Marcel Holtmanne1a38d72015-04-04 21:59:24 -0700169
170struct sk_buff *h4_recv_buf(struct hci_dev *hdev, struct sk_buff *skb,
Marcel Holtmann79b8df92015-04-05 23:44:59 -0700171 const unsigned char *buffer, int count,
172 const struct h4_recv_pkt *pkts, int pkts_count)
Marcel Holtmanne1a38d72015-04-04 21:59:24 -0700173{
174 while (count) {
Marcel Holtmann79b8df92015-04-05 23:44:59 -0700175 int i, len;
Marcel Holtmanne1a38d72015-04-04 21:59:24 -0700176
177 if (!skb) {
Marcel Holtmann79b8df92015-04-05 23:44:59 -0700178 for (i = 0; i < pkts_count; i++) {
179 if (buffer[0] != (&pkts[i])->type)
180 continue;
181
182 skb = bt_skb_alloc((&pkts[i])->maxlen,
Marcel Holtmanne1a38d72015-04-04 21:59:24 -0700183 GFP_ATOMIC);
184 if (!skb)
185 return ERR_PTR(-ENOMEM);
186
Marcel Holtmann79b8df92015-04-05 23:44:59 -0700187 bt_cb(skb)->pkt_type = (&pkts[i])->type;
188 bt_cb(skb)->expect = (&pkts[i])->hlen;
Marcel Holtmanne1a38d72015-04-04 21:59:24 -0700189 break;
Marcel Holtmanne1a38d72015-04-04 21:59:24 -0700190 }
191
Marcel Holtmann79b8df92015-04-05 23:44:59 -0700192 /* Check for invalid packet type */
193 if (!skb)
194 return ERR_PTR(-EILSEQ);
195
Marcel Holtmanne1a38d72015-04-04 21:59:24 -0700196 count -= 1;
197 buffer += 1;
198 }
199
Marcel Holtmann79b8df92015-04-05 23:44:59 -0700200 len = min_t(uint, bt_cb(skb)->expect - skb->len, count);
Marcel Holtmanne1a38d72015-04-04 21:59:24 -0700201 memcpy(skb_put(skb, len), buffer, len);
202
203 count -= len;
204 buffer += len;
Marcel Holtmanne1a38d72015-04-04 21:59:24 -0700205
Marcel Holtmann79b8df92015-04-05 23:44:59 -0700206 /* Check for partial packet */
207 if (skb->len < bt_cb(skb)->expect)
208 continue;
Marcel Holtmanne1a38d72015-04-04 21:59:24 -0700209
Marcel Holtmann79b8df92015-04-05 23:44:59 -0700210 for (i = 0; i < pkts_count; i++) {
211 if (bt_cb(skb)->pkt_type == (&pkts[i])->type)
212 break;
Marcel Holtmanne1a38d72015-04-04 21:59:24 -0700213 }
214
Marcel Holtmann79b8df92015-04-05 23:44:59 -0700215 if (i >= pkts_count) {
216 kfree_skb(skb);
217 return ERR_PTR(-EILSEQ);
218 }
219
220 if (skb->len == (&pkts[i])->hlen) {
221 u16 dlen;
222
223 switch ((&pkts[i])->lsize) {
224 case 0:
225 /* No variable data length */
226 (&pkts[i])->recv(hdev, skb);
227 skb = NULL;
228 break;
229 case 1:
230 /* Single octet variable length */
231 dlen = skb->data[(&pkts[i])->loff];
232 bt_cb(skb)->expect += dlen;
233
234 if (skb_tailroom(skb) < dlen) {
235 kfree_skb(skb);
236 return ERR_PTR(-EMSGSIZE);
237 }
238 break;
239 case 2:
240 /* Double octet variable length */
241 dlen = get_unaligned_le16(skb->data +
242 (&pkts[i])->loff);
243 bt_cb(skb)->expect += dlen;
244
245 if (skb_tailroom(skb) < dlen) {
246 kfree_skb(skb);
247 return ERR_PTR(-EMSGSIZE);
248 }
249 break;
250 default:
251 /* Unsupported variable length */
252 kfree_skb(skb);
253 return ERR_PTR(-EILSEQ);
254 }
255 } else {
Marcel Holtmanne1a38d72015-04-04 21:59:24 -0700256 /* Complete frame */
Marcel Holtmann79b8df92015-04-05 23:44:59 -0700257 (&pkts[i])->recv(hdev, skb);
Marcel Holtmanne1a38d72015-04-04 21:59:24 -0700258 skb = NULL;
259 }
260 }
261
262 return skb;
263}