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git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - drivers/bluetooth/hci_h4.c
3 * Bluetooth HCI UART driver
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>
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.
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.
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
26 #include <linux/module.h>
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>
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>
44 #include <net/bluetooth/bluetooth.h>
45 #include <net/bluetooth/hci_core.h>
52 unsigned long rx_state
;
53 unsigned long rx_count
;
54 struct sk_buff
*rx_skb
;
55 struct sk_buff_head txq
;
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
65 /* Initialize protocol */
66 static int h4_open(struct hci_uart
*hu
)
72 h4
= kzalloc(sizeof(*h4
), GFP_ATOMIC
);
76 skb_queue_head_init(&h4
->txq
);
82 /* Flush protocol data */
83 static int h4_flush(struct hci_uart
*hu
)
85 struct h4_struct
*h4
= hu
->priv
;
89 skb_queue_purge(&h4
->txq
);
95 static int h4_close(struct hci_uart
*hu
)
97 struct h4_struct
*h4
= hu
->priv
;
103 skb_queue_purge(&h4
->txq
);
105 kfree_skb(h4
->rx_skb
);
113 /* Enqueue frame for transmittion (padding, crc, etc) */
114 static int h4_enqueue(struct hci_uart
*hu
, struct sk_buff
*skb
)
116 struct h4_struct
*h4
= hu
->priv
;
118 BT_DBG("hu %p skb %p", hu
, skb
);
120 /* Prepend skb with frame type */
121 memcpy(skb_push(skb
, 1), &bt_cb(skb
)->pkt_type
, 1);
122 skb_queue_tail(&h4
->txq
, skb
);
127 static inline int h4_check_data_len(struct h4_struct
*h4
, int len
)
129 register int room
= skb_tailroom(h4
->rx_skb
);
131 BT_DBG("len %d room %d", len
, room
);
134 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
);
139 h4
->rx_state
= H4_W4_DATA
;
144 h4
->rx_state
= H4_W4_PACKET_TYPE
;
152 static int h4_recv(struct hci_uart
*hu
, void *data
, int count
)
154 struct h4_struct
*h4
= hu
->priv
;
156 struct hci_event_hdr
*eh
;
157 struct hci_acl_hdr
*ah
;
158 struct hci_sco_hdr
*sh
;
159 register int len
, type
, dlen
;
161 BT_DBG("hu %p count %d rx_state %ld rx_count %ld",
162 hu
, count
, h4
->rx_state
, h4
->rx_count
);
167 len
= min_t(unsigned int, h4
->rx_count
, count
);
168 memcpy(skb_put(h4
->rx_skb
, len
), ptr
, len
);
169 h4
->rx_count
-= len
; count
-= len
; ptr
+= len
;
174 switch (h4
->rx_state
) {
176 BT_DBG("Complete data");
178 hci_recv_frame(h4
->rx_skb
);
180 h4
->rx_state
= H4_W4_PACKET_TYPE
;
184 case H4_W4_EVENT_HDR
:
185 eh
= hci_event_hdr(h4
->rx_skb
);
187 BT_DBG("Event header: evt 0x%2.2x plen %d", eh
->evt
, eh
->plen
);
189 h4_check_data_len(h4
, eh
->plen
);
193 ah
= hci_acl_hdr(h4
->rx_skb
);
194 dlen
= __le16_to_cpu(ah
->dlen
);
196 BT_DBG("ACL header: dlen %d", dlen
);
198 h4_check_data_len(h4
, dlen
);
202 sh
= hci_sco_hdr(h4
->rx_skb
);
204 BT_DBG("SCO header: dlen %d", sh
->dlen
);
206 h4_check_data_len(h4
, sh
->dlen
);
211 /* H4_W4_PACKET_TYPE */
214 BT_DBG("Event packet");
215 h4
->rx_state
= H4_W4_EVENT_HDR
;
216 h4
->rx_count
= HCI_EVENT_HDR_SIZE
;
217 type
= HCI_EVENT_PKT
;
220 case HCI_ACLDATA_PKT
:
221 BT_DBG("ACL packet");
222 h4
->rx_state
= H4_W4_ACL_HDR
;
223 h4
->rx_count
= HCI_ACL_HDR_SIZE
;
224 type
= HCI_ACLDATA_PKT
;
227 case HCI_SCODATA_PKT
:
228 BT_DBG("SCO packet");
229 h4
->rx_state
= H4_W4_SCO_HDR
;
230 h4
->rx_count
= HCI_SCO_HDR_SIZE
;
231 type
= HCI_SCODATA_PKT
;
235 BT_ERR("Unknown HCI packet type %2.2x", (__u8
)*ptr
);
236 hu
->hdev
->stat
.err_rx
++;
243 /* Allocate packet */
244 h4
->rx_skb
= bt_skb_alloc(HCI_MAX_FRAME_SIZE
, GFP_ATOMIC
);
246 BT_ERR("Can't allocate mem for new packet");
247 h4
->rx_state
= H4_W4_PACKET_TYPE
;
252 h4
->rx_skb
->dev
= (void *) hu
->hdev
;
253 bt_cb(h4
->rx_skb
)->pkt_type
= type
;
259 static struct sk_buff
*h4_dequeue(struct hci_uart
*hu
)
261 struct h4_struct
*h4
= hu
->priv
;
262 return skb_dequeue(&h4
->txq
);
265 static struct hci_uart_proto h4p
= {
270 .enqueue
= h4_enqueue
,
271 .dequeue
= h4_dequeue
,
277 int err
= hci_uart_register_proto(&h4p
);
280 BT_INFO("HCI H4 protocol initialized");
282 BT_ERR("HCI H4 protocol registration failed");
289 return hci_uart_unregister_proto(&h4p
);