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 int status
= tty
->driver
->ops
->tiocmget(tty
);
56 if (status
& TIOCM_CTS
)
60 tty
->driver
->ops
->tiocmget(tty
);
61 tty
->driver
->ops
->tiocmset(tty
, 0x00, TIOCM_RTS
);
64 /* Set RTS, wake up board */
65 tty
->driver
->ops
->tiocmget(tty
);
66 tty
->driver
->ops
->tiocmset(tty
, TIOCM_RTS
, 0x00);
69 status
= tty
->driver
->ops
->tiocmget(tty
);
73 static void ath_hci_uart_work(struct work_struct
*work
)
76 struct ath_struct
*ath
;
78 struct tty_struct
*tty
;
80 ath
= container_of(work
, struct ath_struct
, ctxtsw
);
85 /* verify and wake up controller */
87 status
= ath_wakeup_ar3k(tty
);
88 if (!(status
& TIOCM_CTS
))
92 /* Ready to send Data */
93 clear_bit(HCI_UART_SENDING
, &hu
->tx_state
);
94 hci_uart_tx_wakeup(hu
);
97 /* Initialize protocol */
98 static int ath_open(struct hci_uart
*hu
)
100 struct ath_struct
*ath
;
104 ath
= kzalloc(sizeof(*ath
), GFP_KERNEL
);
108 skb_queue_head_init(&ath
->txq
);
113 INIT_WORK(&ath
->ctxtsw
, ath_hci_uart_work
);
118 /* Flush protocol data */
119 static int ath_flush(struct hci_uart
*hu
)
121 struct ath_struct
*ath
= hu
->priv
;
125 skb_queue_purge(&ath
->txq
);
131 static int ath_close(struct hci_uart
*hu
)
133 struct ath_struct
*ath
= hu
->priv
;
137 skb_queue_purge(&ath
->txq
);
139 cancel_work_sync(&ath
->ctxtsw
);
147 #define HCI_OP_ATH_SLEEP 0xFC04
149 /* Enqueue frame for transmittion */
150 static int ath_enqueue(struct hci_uart
*hu
, struct sk_buff
*skb
)
152 struct ath_struct
*ath
= hu
->priv
;
154 if (bt_cb(skb
)->pkt_type
== HCI_SCODATA_PKT
) {
160 * Update power management enable flag with parameters of
161 * HCI sleep enable vendor specific HCI command.
163 if (bt_cb(skb
)->pkt_type
== HCI_COMMAND_PKT
) {
164 struct hci_command_hdr
*hdr
= (void *)skb
->data
;
166 if (__le16_to_cpu(hdr
->opcode
) == HCI_OP_ATH_SLEEP
)
167 ath
->cur_sleep
= skb
->data
[HCI_COMMAND_HDR_SIZE
];
170 BT_DBG("hu %p skb %p", hu
, skb
);
172 /* Prepend skb with frame type */
173 memcpy(skb_push(skb
, 1), &bt_cb(skb
)->pkt_type
, 1);
175 skb_queue_tail(&ath
->txq
, skb
);
176 set_bit(HCI_UART_SENDING
, &hu
->tx_state
);
178 schedule_work(&ath
->ctxtsw
);
183 static struct sk_buff
*ath_dequeue(struct hci_uart
*hu
)
185 struct ath_struct
*ath
= hu
->priv
;
187 return skb_dequeue(&ath
->txq
);
191 static int ath_recv(struct hci_uart
*hu
, void *data
, int count
)
195 ret
= hci_recv_stream_fragment(hu
->hdev
, data
, count
);
197 BT_ERR("Frame Reassembly Failed");
204 static struct hci_uart_proto athp
= {
205 .id
= HCI_UART_ATH3K
,
209 .enqueue
= ath_enqueue
,
210 .dequeue
= ath_dequeue
,
214 int __init
ath_init(void)
216 int err
= hci_uart_register_proto(&athp
);
219 BT_INFO("HCIATH3K protocol initialized");
221 BT_ERR("HCIATH3K protocol registration failed");
226 int __exit
ath_deinit(void)
228 return hci_uart_unregister_proto(&athp
);
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