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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>
43
44#include <net/bluetooth/bluetooth.h>
45#include <net/bluetooth/hci_core.h>
Marcel Holtmann0372a662005-10-28 19:20:45 +020046
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include "hci_uart.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
Marcel Holtmann0372a662005-10-28 19:20:45 +020049#define VERSION "1.2"
50
51struct h4_struct {
52 unsigned long rx_state;
53 unsigned long rx_count;
54 struct sk_buff *rx_skb;
55 struct sk_buff_head txq;
56};
57
58/* H4 receiver States */
59#define H4_W4_PACKET_TYPE 0
60#define H4_W4_EVENT_HDR 1
61#define H4_W4_ACL_HDR 2
62#define H4_W4_SCO_HDR 3
63#define H4_W4_DATA 4
64
Linus Torvalds1da177e2005-04-16 15:20:36 -070065/* Initialize protocol */
66static int h4_open(struct hci_uart *hu)
67{
68 struct h4_struct *h4;
Marcel Holtmann0372a662005-10-28 19:20:45 +020069
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 BT_DBG("hu %p", hu);
Marcel Holtmann0372a662005-10-28 19:20:45 +020071
David Herrmannfdcd1662012-01-07 15:19:38 +010072 h4 = kzalloc(sizeof(*h4), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 if (!h4)
74 return -ENOMEM;
Marcel Holtmann0372a662005-10-28 19:20:45 +020075
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 skb_queue_head_init(&h4->txq);
77
78 hu->priv = h4;
79 return 0;
80}
81
82/* Flush protocol data */
83static int h4_flush(struct hci_uart *hu)
84{
85 struct h4_struct *h4 = hu->priv;
86
87 BT_DBG("hu %p", hu);
Marcel Holtmann0372a662005-10-28 19:20:45 +020088
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 skb_queue_purge(&h4->txq);
Marcel Holtmann0372a662005-10-28 19:20:45 +020090
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 return 0;
92}
93
94/* Close protocol */
95static int h4_close(struct hci_uart *hu)
96{
97 struct h4_struct *h4 = hu->priv;
Marcel Holtmann0372a662005-10-28 19:20:45 +020098
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 hu->priv = NULL;
100
101 BT_DBG("hu %p", hu);
102
103 skb_queue_purge(&h4->txq);
Marcel Holtmann0372a662005-10-28 19:20:45 +0200104
Wei Yongjunb1fb0682009-02-25 18:09:33 +0800105 kfree_skb(h4->rx_skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106
107 hu->priv = NULL;
108 kfree(h4);
Marcel Holtmann0372a662005-10-28 19:20:45 +0200109
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 return 0;
111}
112
113/* Enqueue frame for transmittion (padding, crc, etc) */
114static int h4_enqueue(struct hci_uart *hu, struct sk_buff *skb)
115{
116 struct h4_struct *h4 = hu->priv;
117
118 BT_DBG("hu %p skb %p", hu, skb);
119
120 /* Prepend skb with frame type */
Marcel Holtmann0d48d932005-08-09 20:30:28 -0700121 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 skb_queue_tail(&h4->txq, skb);
Marcel Holtmann0372a662005-10-28 19:20:45 +0200123
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 return 0;
125}
126
127static inline int h4_check_data_len(struct h4_struct *h4, int len)
128{
Gustavo Padovanfc5fef62012-05-23 04:04:19 -0300129 int room = skb_tailroom(h4->rx_skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
131 BT_DBG("len %d room %d", len, room);
Marcel Holtmann0372a662005-10-28 19:20:45 +0200132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 if (!len) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 hci_recv_frame(h4->rx_skb);
135 } else if (len > room) {
136 BT_ERR("Data length is too large");
137 kfree_skb(h4->rx_skb);
138 } else {
139 h4->rx_state = H4_W4_DATA;
140 h4->rx_count = len;
141 return len;
142 }
143
144 h4->rx_state = H4_W4_PACKET_TYPE;
145 h4->rx_skb = NULL;
146 h4->rx_count = 0;
Marcel Holtmann0372a662005-10-28 19:20:45 +0200147
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 return 0;
149}
150
151/* Recv data */
152static int h4_recv(struct hci_uart *hu, void *data, int count)
153{
Gustavo F. Padovanb86ed362011-04-07 18:53:45 -0300154 int ret;
155
156 ret = hci_recv_stream_fragment(hu->hdev, data, count);
157 if (ret < 0) {
Gustavo F. Padovane9da1012010-07-24 01:46:57 -0300158 BT_ERR("Frame Reassembly Failed");
Gustavo F. Padovanb86ed362011-04-07 18:53:45 -0300159 return ret;
160 }
Marcel Holtmann0372a662005-10-28 19:20:45 +0200161
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 return count;
163}
164
165static struct sk_buff *h4_dequeue(struct hci_uart *hu)
166{
167 struct h4_struct *h4 = hu->priv;
168 return skb_dequeue(&h4->txq);
169}
170
171static struct hci_uart_proto h4p = {
Marcel Holtmann0372a662005-10-28 19:20:45 +0200172 .id = HCI_UART_H4,
173 .open = h4_open,
174 .close = h4_close,
175 .recv = h4_recv,
176 .enqueue = h4_enqueue,
177 .dequeue = h4_dequeue,
178 .flush = h4_flush,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179};
Marcel Holtmann0372a662005-10-28 19:20:45 +0200180
Gustavo F. Padovanf2b94bb2010-07-24 02:04:44 -0300181int __init h4_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182{
183 int err = hci_uart_register_proto(&h4p);
Marcel Holtmann0372a662005-10-28 19:20:45 +0200184
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 if (!err)
186 BT_INFO("HCI H4 protocol initialized");
187 else
188 BT_ERR("HCI H4 protocol registration failed");
Marcel Holtmann0372a662005-10-28 19:20:45 +0200189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 return err;
191}
192
Gustavo F. Padovanf2b94bb2010-07-24 02:04:44 -0300193int __exit h4_deinit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194{
195 return hci_uart_unregister_proto(&h4p);
196}