This implements the Atheros Bluetooth serial protocol to
support the AR300x Bluetooth chipsets.
The serial protocol implements enhanced power management
features for the AR300x chipsets.
Reviewed-by: Luis R. Rodriguez <lrodriguez@xxxxxxxxxxx>
Signed-off-by: Suraj <suraj@xxxxxxxxxxx>
---
drivers/bluetooth/Kconfig | 14 ++
drivers/bluetooth/Makefile | 1 +
drivers/bluetooth/hci_ath.c | 378 +++++++++++++++++++++++++++++++++++++++++
drivers/bluetooth/hci_ldisc.c | 6 +
drivers/bluetooth/hci_uart.h | 8 +-
5 files changed, 406 insertions(+), 1 deletions(-)
create mode 100755 drivers/bluetooth/hci_ath.c
diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index 058fbcc..5546142 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -58,6 +58,20 @@ config BT_HCIUART_BCSP
Say Y here to compile support for HCI BCSP protocol.
+config BT_HCIUART_ATH
+ bool "Atheros AR300x serial Bluetooth support"
+ depends on BT_HCIUART
+ help
+ HCIATH (HCI Atheros) is a serial protocol for communication
+ between the host and Atheros AR300x Bluetooth devices. The
+ protocol implements enhaned power management features for the
+ the AR300x chipsets. it lets the controller chip go to sleep
+ mode if there is no Bluetooth activity for some time and wakes
+ up the chip in case of a Bluetooth activity. Enable this option
+ if you have an UART Atheros AR300x serial device.
+
+ Say Y here to compile support for HCIATH protocol.
+
config BT_HCIUART_LL
bool "HCILL protocol support"
depends on BT_HCIUART
diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
index 7e5aed5..1481faa 100644
--- a/drivers/bluetooth/Makefile
+++ b/drivers/bluetooth/Makefile
@@ -26,4 +26,5 @@ hci_uart-y := hci_ldisc.o
hci_uart-$(CONFIG_BT_HCIUART_H4) += hci_h4.o
hci_uart-$(CONFIG_BT_HCIUART_BCSP) += hci_bcsp.o
hci_uart-$(CONFIG_BT_HCIUART_LL) += hci_ll.o
+hci_uart-$(CONFIG_BT_HCIUART_ATH) += hci_ath.o
hci_uart-objs := $(hci_uart-y)
diff --git a/drivers/bluetooth/hci_ath.c b/drivers/bluetooth/hci_ath.c
new file mode 100755
index 0000000..7e99559
--- /dev/null
+++ b/drivers/bluetooth/hci_ath.c
@@ -0,0 +1,378 @@
+/*
+ * Copyright (c) 2009-2010 Atheros Communications Inc.
+ *
+ * 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"
+
+/* HCIATH receiver States */
+#define HCIATH_W4_PACKET_TYPE 0
+#define HCIATH_W4_EVENT_HDR 1
+#define HCIATH_W4_ACL_HDR 2
+#define HCIATH_W4_SCO_HDR 3
+#define HCIATH_W4_DATA 4
+
+struct ath_struct {
+ struct hci_uart *hu;
+ unsigned int rx_state;
+ unsigned int rx_count;
+ unsigned int cur_sleep;
+
+ spinlock_t hciath_lock;
+ struct sk_buff *rx_skb;
+ struct sk_buff_head txq;
+ wait_queue_head_t wqevt;
+ struct work_struct ctxtsw;
+};
+
+static int ath_wakeup_ar3001(struct tty_struct *tty)
+{
+ struct termios settings;
+ int status = tty->driver->ops->tiocmget(tty, NULL);
+
+ if (status & TIOCM_CTS)
+ return status;
+
+ n_tty_ioctl_helper(tty, NULL, TCGETS, (unsigned long)&settings);
+
+ /* Disable Automatic RTSCTS */
+ settings.c_cflag &= ~CRTSCTS;
+ n_tty_ioctl_helper(tty, NULL, TCSETS, (unsigned long)&settings);
+
+ status = tty->driver->ops->tiocmget(tty, NULL);
+
+ /* Clear RTS first */
+ tty->driver->ops->tiocmset(tty, NULL, 0x00, TIOCM_RTS);
+ mdelay(20);
+
+ status = tty->driver->ops->tiocmget(tty, NULL);
+
+ /* Set RTS, wake up board */
+ tty->driver->ops->tiocmset(tty, NULL, TIOCM_RTS, 0x00);
+ mdelay(20);
+
+ status = tty->driver->ops->tiocmget(tty, NULL);
+
+ n_tty_ioctl_helper(tty, NULL, TCGETS, (unsigned long)&settings);
+
+ settings.c_cflag |= CRTSCTS;
+ n_tty_ioctl_helper(tty, NULL, TCSETS, (unsigned long)&settings);
+
+ 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_ar3001(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);
+ spin_lock_init(&ath->hciath_lock);
+
+ hu->priv = ath;
+ ath->hu = hu;
+
+ init_waitqueue_head(&ath->wqevt);
+ 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);
+
+ kfree_skb(ath->rx_skb);
+
+ cancel_work_sync(&ath->ctxtsw);
+
+ hu->priv = NULL;
+ kfree(ath);
+
+ return 0;
+}
+
+/* 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) {
+
+ /* Discard SCO packet. AR3001 does not support SCO over HCI */
+ BT_DBG("SCO Packet over HCI received Dropping");
+
+ kfree(skb);
+
+ return 0;
+ }
+
+ 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;
+ struct sk_buff *skbuf;
+
+ skbuf = skb_dequeue(&ath->txq);
+
+ if (!skbuf)
+ return NULL;
+
+ /*
+ * Check if the HCI command is HCI sleep enable and
+ * update the sleep enable flag with command parameter.
+ *
+ * Value of sleep enable flag will be used later
+ * to verify if controller has to be woken up before
+ * sending any packet.
+ */
+ if (skbuf->data[0] == 0x01 &&
+ skbuf->data[1] == 0x04 &&
+ skbuf->data[2] == 0xFC)
+ ath->cur_sleep = skbuf->data[4];
+
+ return skbuf;
+}
+
+static void ath_check_data_len(struct ath_struct *ath, int len)
+{
+ int room = skb_tailroom(ath->rx_skb);
+
+ BT_DBG("len %d room %d", len, room);
+
+ if (len > room) {
+ BT_ERR("Data length is too large");
+ kfree_skb(ath->rx_skb);
+ ath->rx_state = HCIATH_W4_PACKET_TYPE;
+ ath->rx_skb = NULL;
+ ath->rx_count = 0;
+ } else {
+ ath->rx_state = HCIATH_W4_DATA;
+ ath->rx_count = len;
+ }
+}
+
+/* Recv data */
+static int ath_recv(struct hci_uart *hu, void *data, int count)
+{
+ struct ath_struct *ath = hu->priv;
+ char *ptr = data;
+ struct hci_event_hdr *eh;
+ struct hci_acl_hdr *ah;
+ struct hci_sco_hdr *sh;
+ int len, type, dlen;
+
+ BT_DBG("hu %p count %d rx_state %d rx_count %d", hu, count,
+ ath->rx_state, ath->rx_count);
+
+ while (count) {
+ if (ath->rx_count) {
+
+ len = min_t(unsigned int, ath->rx_count, count);
+ memcpy(skb_put(ath->rx_skb, len), ptr, len);
+ ath->rx_count -= len;
+ count -= len;
+ ptr += len;
+
+ if (ath->rx_count)
+ continue;
+ switch (ath->rx_state) {
+ case HCIATH_W4_DATA:
+ hci_recv_frame(ath->rx_skb);
+ ath->rx_state = HCIATH_W4_PACKET_TYPE;
+ ath->rx_skb = NULL;
+ ath->rx_count = 0;
+ continue;
+
+ case HCIATH_W4_EVENT_HDR:
+ eh = (struct hci_event_hdr *)ath->rx_skb->data;
