2 BlueZ - Bluetooth protocol stack for Linux
3 Copyright (C) 2000-2001 Qualcomm Incorporated
5 Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
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;
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.
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.
26 * Bluetooth HCI UART(H4) protocol.
28 * $Id: hci_h4.c,v 1.3 2002/09/09 01:17:32 maxk Exp $
32 #include <linux/config.h>
33 #include <linux/module.h>
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>
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>
52 #include <net/bluetooth/bluetooth.h>
53 #include <net/bluetooth/hci_core.h>
57 #ifndef CONFIG_BT_HCIUART_DEBUG
59 #define BT_DBG( A... )
62 /* Initialize protocol */
63 static int h4_open(struct hci_uart *hu)
69 h4 = kmalloc(sizeof(*h4), GFP_ATOMIC);
72 memset(h4, 0, sizeof(*h4));
74 skb_queue_head_init(&h4->txq);
80 /* Flush protocol data */
81 static int h4_flush(struct hci_uart *hu)
83 struct h4_struct *h4 = hu->priv;
86 skb_queue_purge(&h4->txq);
91 static int h4_close(struct hci_uart *hu)
93 struct h4_struct *h4 = hu->priv;
98 skb_queue_purge(&h4->txq);
100 kfree_skb(h4->rx_skb);
107 /* Enqueue frame for transmittion (padding, crc, etc) */
108 static int h4_enqueue(struct hci_uart *hu, struct sk_buff *skb)
110 struct h4_struct *h4 = hu->priv;
112 BT_DBG("hu %p skb %p", hu, skb);
114 /* Prepend skb with frame type */
115 memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
116 skb_queue_tail(&h4->txq, skb);
120 static inline int h4_check_data_len(struct h4_struct *h4, int len)
122 register int room = skb_tailroom(h4->rx_skb);
124 BT_DBG("len %d room %d", len, room);
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);
131 h4->rx_state = H4_W4_DATA;
136 h4->rx_state = H4_W4_PACKET_TYPE;
143 static int h4_recv(struct hci_uart *hu, void *data, int count)
145 struct h4_struct *h4 = hu->priv;
147 struct hci_event_hdr *eh;
148 struct hci_acl_hdr *ah;
149 struct hci_sco_hdr *sh;
150 register int len, type, dlen;
152 BT_DBG("hu %p count %d rx_state %ld rx_count %ld",
153 hu, count, h4->rx_state, 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;
165 switch (h4->rx_state) {
167 BT_DBG("Complete data");
169 hci_recv_frame(h4->rx_skb);
171 h4->rx_state = H4_W4_PACKET_TYPE;
175 case H4_W4_EVENT_HDR:
176 eh = (struct hci_event_hdr *) h4->rx_skb->data;
178 BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen);
180 h4_check_data_len(h4, eh->plen);
184 ah = (struct hci_acl_hdr *) h4->rx_skb->data;
185 dlen = __le16_to_cpu(ah->dlen);
187 BT_DBG("ACL header: dlen %d", dlen);
189 h4_check_data_len(h4, dlen);
193 sh = (struct hci_sco_hdr *) h4->rx_skb->data;
195 BT_DBG("SCO header: dlen %d", sh->dlen);
197 h4_check_data_len(h4, sh->dlen);
202 /* H4_W4_PACKET_TYPE */
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;
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;
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;
226 BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr);
227 hu->hdev->stat.err_rx++;
233 /* Allocate packet */
234 h4->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
236 BT_ERR("Can't allocate mem for new packet");
237 h4->rx_state = H4_W4_PACKET_TYPE;
241 h4->rx_skb->dev = (void *) hu->hdev;
242 bt_cb(h4->rx_skb)->pkt_type = type;
247 static struct sk_buff *h4_dequeue(struct hci_uart *hu)
249 struct h4_struct *h4 = hu->priv;
250 return skb_dequeue(&h4->txq);
253 static struct hci_uart_proto h4p = {
258 .enqueue = h4_enqueue,
259 .dequeue = h4_dequeue,
265 int err = hci_uart_register_proto(&h4p);
267 BT_INFO("HCI H4 protocol initialized");
269 BT_ERR("HCI H4 protocol registration failed");
276 return hci_uart_unregister_proto(&h4p);