2 * Atheros Communication Bluetooth HCIATH3K UART protocol
4 * HCIATH3K (HCI Atheros AR300x Protocol) is a Atheros Communication's
5 * power management protocol extension to H4 to support AR300x Bluetooth Chip.
7 * Copyright (c) 2009-2010 Atheros Communications Inc.
10 * This file is based on hci_h4.c, which was written
11 * by Maxim Krasnyansky and Marcel Holtmann.
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 #include <linux/module.h>
30 #include <linux/kernel.h>
32 #include <linux/init.h>
33 #include <linux/slab.h>
34 #include <linux/tty.h>
35 #include <linux/errno.h>
36 #include <linux/ioctl.h>
37 #include <linux/skbuff.h>
39 #include <net/bluetooth/bluetooth.h>
40 #include <net/bluetooth/hci_core.h>
46 unsigned int cur_sleep
;
48 struct sk_buff_head txq
;
49 struct work_struct ctxtsw
;
52 static int ath_wakeup_ar3k(struct tty_struct
*tty
)
54 struct ktermios ktermios
;
55 int status
= tty
->driver
->ops
->tiocmget(tty
);
57 if (status
& TIOCM_CTS
)
60 /* Disable Automatic RTSCTS */
61 memcpy(&ktermios
, tty
->termios
, sizeof(ktermios
));
62 ktermios
.c_cflag
&= ~CRTSCTS
;
63 tty_set_termios(tty
, &ktermios
);
66 status
= tty
->driver
->ops
->tiocmget(tty
);
67 tty
->driver
->ops
->tiocmset(tty
, 0x00, TIOCM_RTS
);
70 /* Set RTS, wake up board */
71 status
= tty
->driver
->ops
->tiocmget(tty
);
72 tty
->driver
->ops
->tiocmset(tty
, TIOCM_RTS
, 0x00);
75 status
= tty
->driver
->ops
->tiocmget(tty
);
77 /* Disable Automatic RTSCTS */
78 ktermios
.c_cflag
|= CRTSCTS
;
79 status
= tty_set_termios(tty
, &ktermios
);
84 static void ath_hci_uart_work(struct work_struct
*work
)
87 struct ath_struct
*ath
;
89 struct tty_struct
*tty
;
91 ath
= container_of(work
, struct ath_struct
, ctxtsw
);
96 /* verify and wake up controller */
98 status
= ath_wakeup_ar3k(tty
);
99 if (!(status
& TIOCM_CTS
))
103 /* Ready to send Data */
104 clear_bit(HCI_UART_SENDING
, &hu
->tx_state
);
105 hci_uart_tx_wakeup(hu
);
108 /* Initialize protocol */
109 static int ath_open(struct hci_uart
*hu
)
111 struct ath_struct
*ath
;
115 ath
= kzalloc(sizeof(*ath
), GFP_ATOMIC
);
119 skb_queue_head_init(&ath
->txq
);
124 INIT_WORK(&ath
->ctxtsw
, ath_hci_uart_work
);
129 /* Flush protocol data */
130 static int ath_flush(struct hci_uart
*hu
)
132 struct ath_struct
*ath
= hu
->priv
;
136 skb_queue_purge(&ath
->txq
);
142 static int ath_close(struct hci_uart
*hu
)
144 struct ath_struct
*ath
= hu
->priv
;
148 skb_queue_purge(&ath
->txq
);
150 cancel_work_sync(&ath
->ctxtsw
);
158 #define HCI_OP_ATH_SLEEP 0xFC04
160 /* Enqueue frame for transmittion */
161 static int ath_enqueue(struct hci_uart
*hu
, struct sk_buff
*skb
)
163 struct ath_struct
*ath
= hu
->priv
;
165 if (bt_cb(skb
)->pkt_type
== HCI_SCODATA_PKT
) {
171 * Update power management enable flag with parameters of
172 * HCI sleep enable vendor specific HCI command.
174 if (bt_cb(skb
)->pkt_type
== HCI_COMMAND_PKT
) {
175 struct hci_command_hdr
*hdr
= (void *)skb
->data
;
177 if (__le16_to_cpu(hdr
->opcode
) == HCI_OP_ATH_SLEEP
)
178 ath
->cur_sleep
= skb
->data
[HCI_COMMAND_HDR_SIZE
];
181 BT_DBG("hu %p skb %p", hu
, skb
);
183 /* Prepend skb with frame type */
184 memcpy(skb_push(skb
, 1), &bt_cb(skb
)->pkt_type
, 1);
186 skb_queue_tail(&ath
->txq
, skb
);
187 set_bit(HCI_UART_SENDING
, &hu
->tx_state
);
189 schedule_work(&ath
->ctxtsw
);
194 static struct sk_buff
*ath_dequeue(struct hci_uart
*hu
)
196 struct ath_struct
*ath
= hu
->priv
;
198 return skb_dequeue(&ath
->txq
);
202 static int ath_recv(struct hci_uart
*hu
, void *data
, int count
)
206 ret
= hci_recv_stream_fragment(hu
->hdev
, data
, count
);
208 BT_ERR("Frame Reassembly Failed");
215 static struct hci_uart_proto athp
= {
216 .id
= HCI_UART_ATH3K
,
220 .enqueue
= ath_enqueue
,
221 .dequeue
= ath_dequeue
,
225 int __init
ath_init(void)
227 int err
= hci_uart_register_proto(&athp
);
230 BT_INFO("HCIATH3K protocol initialized");
232 BT_ERR("HCIATH3K protocol registration failed");
237 int __exit
ath_deinit(void)
239 return hci_uart_unregister_proto(&athp
);
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