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* Atheros Communication Bluetooth HCIATH3K UART protocol
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* HCIATH3K (HCI Atheros AR300x Protocol) is a Atheros Communication's
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* power management protocol extension to H4 to support AR300x Bluetooth Chip.
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* Copyright (c) 2009-2010 Atheros Communications Inc.
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* This file is based on hci_h4.c, which was written
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* by Maxim Krasnyansky and Marcel Holtmann.
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/errno.h>
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#include <linux/ioctl.h>
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#include <linux/skbuff.h>
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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unsigned int cur_sleep;
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struct sk_buff_head txq;
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struct work_struct ctxtsw;
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static int ath_wakeup_ar3k(struct tty_struct *tty)
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struct ktermios ktermios;
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int status = tty->driver->ops->tiocmget(tty);
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if (status & TIOCM_CTS)
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/* Disable Automatic RTSCTS */
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memcpy(&ktermios, tty->termios, sizeof(ktermios));
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ktermios.c_cflag &= ~CRTSCTS;
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tty_set_termios(tty, &ktermios);
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status = tty->driver->ops->tiocmget(tty);
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tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS);
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/* Set RTS, wake up board */
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status = tty->driver->ops->tiocmget(tty);
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tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00);
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status = tty->driver->ops->tiocmget(tty);
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/* Disable Automatic RTSCTS */
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ktermios.c_cflag |= CRTSCTS;
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status = tty_set_termios(tty, &ktermios);
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static void ath_hci_uart_work(struct work_struct *work)
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struct ath_struct *ath;
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struct tty_struct *tty;
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ath = container_of(work, struct ath_struct, ctxtsw);
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/* verify and wake up controller */
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status = ath_wakeup_ar3k(tty);
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if (!(status & TIOCM_CTS))
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/* Ready to send Data */
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clear_bit(HCI_UART_SENDING, &hu->tx_state);
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hci_uart_tx_wakeup(hu);
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/* Initialize protocol */
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static int ath_open(struct hci_uart *hu)
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struct ath_struct *ath;
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ath = kzalloc(sizeof(*ath), GFP_ATOMIC);
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skb_queue_head_init(&ath->txq);
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INIT_WORK(&ath->ctxtsw, ath_hci_uart_work);
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/* Flush protocol data */
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static int ath_flush(struct hci_uart *hu)
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struct ath_struct *ath = hu->priv;
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skb_queue_purge(&ath->txq);
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static int ath_close(struct hci_uart *hu)
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struct ath_struct *ath = hu->priv;
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skb_queue_purge(&ath->txq);
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cancel_work_sync(&ath->ctxtsw);
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#define HCI_OP_ATH_SLEEP 0xFC04
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/* Enqueue frame for transmittion */
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static int ath_enqueue(struct hci_uart *hu, struct sk_buff *skb)
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struct ath_struct *ath = hu->priv;
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if (bt_cb(skb)->pkt_type == HCI_SCODATA_PKT) {
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* Update power management enable flag with parameters of
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* HCI sleep enable vendor specific HCI command.
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if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
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struct hci_command_hdr *hdr = (void *)skb->data;
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if (__le16_to_cpu(hdr->opcode) == HCI_OP_ATH_SLEEP)
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ath->cur_sleep = skb->data[HCI_COMMAND_HDR_SIZE];
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BT_DBG("hu %p skb %p", hu, skb);
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/* Prepend skb with frame type */
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memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
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skb_queue_tail(&ath->txq, skb);
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set_bit(HCI_UART_SENDING, &hu->tx_state);
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schedule_work(&ath->ctxtsw);
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static struct sk_buff *ath_dequeue(struct hci_uart *hu)
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struct ath_struct *ath = hu->priv;
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return skb_dequeue(&ath->txq);
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static int ath_recv(struct hci_uart *hu, void *data, int count)
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ret = hci_recv_stream_fragment(hu->hdev, data, count);
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BT_ERR("Frame Reassembly Failed");
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static struct hci_uart_proto athp = {
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.id = HCI_UART_ATH3K,
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.enqueue = ath_enqueue,
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.dequeue = ath_dequeue,
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int __init ath_init(void)
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int err = hci_uart_register_proto(&athp);
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BT_INFO("HCIATH3K protocol initialized");
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BT_ERR("HCIATH3K protocol registration failed");
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int __exit ath_deinit(void)
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return hci_uart_unregister_proto(&athp);