/*
* Atheros Communication Bluetooth HCIATH3K UART protocol
*
* HCIATH3K (HCI Atheros AR300x Protocol) is a Atheros Communication's
* power management protocol extension to H4 to support AR300x Bluetooth Chip.
*
* Copyright (c) 2009-2010 Atheros Communications Inc.
*
* Acknowledgements:
* This file is based on hci_h4.c, which was written
* by Maxim Krasnyansky and Marcel Holtmann.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/errno.h>
#include <linux/ioctl.h>
#include <linux/skbuff.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include "hci_uart.h"
struct ath_struct {
struct hci_uart *hu;
unsigned int cur_sleep;
struct sk_buff_head txq;
struct work_struct ctxtsw;
};
static int ath_wakeup_ar3k(struct tty_struct *tty)
{
struct ktermios ktermios;
int status = tty->driver->ops->tiocmget(tty);
if (status & TIOCM_CTS)
return status;
/* Disable Automatic RTSCTS */
memcpy(&ktermios, tty->termios, sizeof(ktermios));
ktermios.c_cflag &= ~CRTSCTS;
tty_set_termios(tty, &ktermios);
/* Clear RTS first */
status = tty->driver->ops->tiocmget(tty);
tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS);
mdelay(20);
/* Set RTS, wake up board */
status = tty->driver->ops->tiocmget(tty);
tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00);
mdelay(20);
status = tty->driver->ops->tiocmget(tty);
/* Disable Automatic RTSCTS */
ktermios.c_cflag |= CRTSCTS;
status = tty_set_termios(tty, &ktermios);
return status;
}
static void ath_hci_uart_work(struct work_struct *work)
{
int status;
struct ath_struct *ath;
struct hci_uart *hu;
struct tty_struct *tty;
ath = container_of(work, struct ath_struct, ctxtsw);
hu = ath->hu;
tty = hu->tty;
/* verify and wake up controller */
if (ath->cur_sleep) {
status = ath_wakeup_ar3k(tty);
if (!(status & TIOCM_CTS))
return;
}
/* Ready to send Data */
clear_bit(HCI_UART_SENDING, &hu->tx_state);
hci_uart_tx_wakeup(hu);
}
/* Initialize protocol */
static int ath_open(struct hci_uart *hu)
{
struct ath_struct *ath;
BT_DBG("hu %p", hu);
ath = kzalloc(sizeof(*ath), GFP_ATOMIC);
if (!ath)
return -ENOMEM;
skb_queue_head_init(&ath->txq);
hu->priv = ath;
ath->hu = hu;
INIT_WORK(&ath->ctxtsw, ath_hci_uart_work);
return 0;
}
/* Flush protocol data */
static int ath_flush(struct hci_uart *hu)
{
struct ath_struct *ath = hu->priv;
BT_DBG("hu %p", hu);
skb_queue_purge(&ath->txq);
return 0;
}
/* Close protocol */
static int ath_close(struct hci_uart *hu)
{
struct ath_struct *ath = hu->priv;
BT_DBG("hu %p", hu);
skb_queue_purge(&ath->txq);
cancel_work_sync(&ath->ctxtsw);
hu->priv = NULL;
kfree(ath);
return 0;
}
#define HCI_OP_ATH_SLEEP 0xFC04
/* Enqueue frame for transmittion */
static int ath_enqueue(struct hci_uart *hu, struct sk_buff *skb)
{
struct ath_struct *ath = hu->priv;
if (bt_cb(skb)->pkt_type == HCI_SCODATA_PKT) {
kfree_skb(skb);
return 0;
}
/*
* Update power management enable flag with parameters of
* HCI sleep enable vendor specific HCI command.
*/
if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
struct hci_command_hdr *hdr = (void *)skb->data;
if (__le16_to_cpu(hdr->opcode) == HCI_OP_ATH_SLEEP)
ath->cur_sleep = skb->data[HCI_COMMAND_HDR_SIZE];
}
BT_DBG("hu %p skb %p", hu, skb);
/* Prepend skb with frame type */
memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
skb_queue_tail(&ath->txq, skb);
set_bit(HCI_UART_SENDING, &hu->tx_state);
schedule_work(&ath->ctxtsw);
return 0;
}
static struct sk_buff *ath_dequeue(struct hci_uart *hu)
{
struct ath_struct *ath = hu->priv;
return skb_dequeue(&ath->txq);
}
/* Recv data */
static int ath_recv(struct hci_uart *hu, void *data, int count)
{
int ret;
ret = hci_recv_stream_fragment(hu->hdev, data, count);
if (ret < 0) {
BT_ERR("Frame Reassembly Failed");
return ret;
}
return count;
}
static struct hci_uart_proto athp = {
.id = HCI_UART_ATH3K,
.open = ath_open,
.close = ath_close,
.recv = ath_recv,
.enqueue = ath_enqueue,
.dequeue = ath_dequeue,
.flush = ath_flush,
};
int __init ath_init(void)
{
int err = hci_uart_register_proto(&athp);
if (!err)
BT_INFO("HCIATH3K protocol initialized");
else
BT_ERR("HCIATH3K protocol registration failed");
return err;
}
int __exit ath_deinit(void)
{
return hci_uart_unregister_proto(&athp);
}
