Atheros patch to support ath3k BT device.

drivers/bluetooth/hci_ath.c

Index: drivers/bluetooth/hci_ath.c
diff --git a/drivers/bluetooth/hci_ath.c b/drivers/bluetooth/hci_ath.c
new file mode 100644
index 0000000000000000000000000000000000000000..f1a26823a4d526d824e8e5d09d3c6c77d53aa572
--- /dev/null
+++ b/drivers/bluetooth/hci_ath.c
@@ -0,0 +1,353 @@
+/*
+ * 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;
+};
+
+int ath_wakeup_ar3001(struct tty_struct *tty)
+{
+	struct termios settings;
+	int status = 0x00;
+	mm_segment_t oldfs;
+	status = tty->driver->ops->tiocmget(tty, NULL);
+
+	if ((status & TIOCM_CTS))
+		return status;
+
+	oldfs = get_fs();
+	set_fs(KERNEL_DS);
+	n_tty_ioctl_helper(tty, NULL, TCGETS, (unsigned long)&settings);
+
+	settings.c_cflag &= ~CRTSCTS;
+	n_tty_ioctl_helper(tty, NULL, TCSETS, (unsigned long)&settings);
+	set_fs(oldfs);
+	status = tty->driver->ops->tiocmget(tty, NULL);
+
+	/* Wake up board */
+	tty->driver->ops->tiocmset(tty, NULL, 0x00, TIOCM_RTS);
+	mdelay(20);
+
+	status = tty->driver->ops->tiocmget(tty, NULL);
+
+	tty->driver->ops->tiocmset(tty, NULL, TIOCM_RTS, 0x00);
+	mdelay(20);
+
+	status = tty->driver->ops->tiocmget(tty, NULL);
+	oldfs = get_fs();
+	set_fs(KERNEL_DS);
+	n_tty_ioctl_helper(tty, NULL, TCGETS, (unsigned long)&settings);
+
+	settings.c_cflag |= CRTSCTS;
+	n_tty_ioctl_helper(tty, NULL, TCSETS, (unsigned long)&settings);
+	set_fs(oldfs);
+	return status;
+}
+
+static void ath_context_switch(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);
+}
+
+int ath_check_sleep_cmd(struct ath_struct *ath, unsigned char *packet)
+{
+	if (packet[0] == 0x04 && packet[1] == 0xFC)
+		ath->cur_sleep = packet[3];
+
+	return 0;
+}
+
+
+/* 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);
+
+	ath->cur_sleep = 0;
+	hu->priv = ath;
+	ath->hu = hu;
+
+	init_waitqueue_head(&ath->wqevt);
+	INIT_WORK(&ath->ctxtsw, ath_context_switch);
+	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);
+
+	if (ath->rx_skb)
+		kfree_skb(ath->rx_skb);
+
+	wake_up_interruptible(&ath->wqevt);
+	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\n");
+		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 != NULL)
+		ath_check_sleep_cmd(ath, &skbuf->data[1]);
+
+	return skbuf;
+}
+
+static inline int ath_check_data_len(struct ath_struct *ath, int len)
+{
+	register 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;
+		return len;
+	}
+
+	return 0;
+}
+
+/* Recv data */
+static int ath_recv(struct hci_uart *hu, void *data, int count)
+{
+	struct ath_struct *ath = hu->priv;
+	register char *ptr;
+	struct hci_event_hdr *eh;
+	struct hci_acl_hdr *ah;
+	struct hci_sco_hdr *sh;
+	struct sk_buff *skbuf;
+	register int len, type, dlen;
+
+	skbuf = NULL;
+	BT_DBG("hu %p count %d rx_state %d rx_count %d", hu, count,
+	       ath->rx_state, ath->rx_count);
+	ptr = data;
+	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;
+				BT_DBG("Event header: evt 0x%2.2x plen %d",
+				       eh->evt, eh->plen);
+				ath_check_data_len(ath, eh->plen);
+				continue;
+			case HCIATH_W4_ACL_HDR:
+				ah = (struct hci_acl_hdr *)ath->rx_skb->data;
+				dlen = __le16_to_cpu(ah->dlen);
+				BT_DBG("ACL header: dlen %d", dlen);
+				ath_check_data_len(ath, dlen);
+				continue;
+			case HCIATH_W4_SCO_HDR:
+				sh = (struct hci_sco_hdr *)ath->rx_skb->data;
+				BT_DBG("SCO header: dlen %d", sh->dlen);
+				ath_check_data_len(ath, sh->dlen);
+				continue;
+			}
+		}
+
+		/* HCIATH_W4_PACKET_TYPE */
+		switch (*ptr) {
+		case HCI_EVENT_PKT:
+			BT_DBG("Event packet");
+			ath->rx_state = HCIATH_W4_EVENT_HDR;
+			ath->rx_count = HCI_EVENT_HDR_SIZE;
+			type = HCI_EVENT_PKT;
+			break;
+		case HCI_ACLDATA_PKT:
+			BT_DBG("ACL packet");
+			ath->rx_state = HCIATH_W4_ACL_HDR;
+			ath->rx_count = HCI_ACL_HDR_SIZE;
+			type = HCI_ACLDATA_PKT;
+			break;
+		case HCI_SCODATA_PKT:
+			BT_DBG("SCO packet");
+			ath->rx_state = HCIATH_W4_SCO_HDR;
+			ath->rx_count = HCI_SCO_HDR_SIZE;
+			type = HCI_SCODATA_PKT;
+			break;
+		default:
+			BT_ERR("Unknown HCI packet type %2.2x", (__u8) *ptr);
+			hu->hdev->stat.err_rx++;
+			ptr++;
+			count--;
+			continue;
+		};
+		ptr++;
+		count--;
+
+		/* Allocate packet */
+		ath->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
+		if (!ath->rx_skb) {
+			BT_ERR("Can't allocate mem for new packet");
+			ath->rx_state = HCIATH_W4_PACKET_TYPE;
+			ath->rx_count = 0;
+			return -ENOMEM;
+		}
+		ath->rx_skb->dev = (void *)hu->hdev;
+		bt_cb(ath->rx_skb)->pkt_type = type;
+	} return count;
+}
+
+static struct hci_uart_proto athp = {
+	.id = HCI_UART_ATH,
+	.open = ath_open,
+	.close = ath_close,
+	.recv = ath_recv,
+	.enqueue = ath_enqueue,
+	.dequeue = ath_dequeue,
+	.flush = ath_flush,
+};
+
+int ath_init(void)
+{
+	int err = hci_uart_register_proto(&athp);
+	if (!err)
+		BT_INFO("HCIATH protocol initialized");
+
+	else
+		BT_ERR("HCIATH protocol registration failed with err %d", err);
+	return err;
+}
+
+int ath_deinit(void)
+{
+	return hci_uart_unregister_proto(&athp);
+}