[deliverable/linux.git] / drivers / bluetooth / hci_ath.c

/*
 *  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)
{
	int status = tty->driver->ops->tiocmget(tty);

	if (status & TIOCM_CTS)
		return status;

	/* Clear RTS first */
	tty->driver->ops->tiocmget(tty);
	tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS);
	mdelay(20);

	/* Set RTS, wake up board */
	tty->driver->ops->tiocmget(tty);
	tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00);
	mdelay(20);

	status = tty->driver->ops->tiocmget(tty);
	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_KERNEL);
	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);
}
Commit	Line	Data
b3190df6 SS	1	/*
	2	* Atheros Communication Bluetooth HCIATH3K UART protocol
	3	*
	4	* HCIATH3K (HCI Atheros AR300x Protocol) is a Atheros Communication's
	5	* power management protocol extension to H4 to support AR300x Bluetooth Chip.
	6	*
	7	* Copyright (c) 2009-2010 Atheros Communications Inc.
	8	*
	9	* Acknowledgements:
	10	* This file is based on hci_h4.c, which was written
	11	* by Maxim Krasnyansky and Marcel Holtmann.
	12	*
	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.
	17	*
	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.
	22	*
	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
	26	*
	27	*/
	28
	29	#include <linux/module.h>
	30	#include <linux/kernel.h>
	31
	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>
	38
	39	#include <net/bluetooth/bluetooth.h>
	40	#include <net/bluetooth/hci_core.h>
	41
	42	#include "hci_uart.h"
	43
	44	struct ath_struct {
	45	struct hci_uart *hu;
	46	unsigned int cur_sleep;
	47
	48	struct sk_buff_head txq;
	49	struct work_struct ctxtsw;
	50	};
	51
	52	static int ath_wakeup_ar3k(struct tty_struct *tty)
	53	{
afaae084	54	int status = tty->driver->ops->tiocmget(tty);
b3190df6 SS	55
	56	if (status & TIOCM_CTS)
	57	return status;
	58
b3190df6	59	/* Clear RTS first */
632f32e2	60	tty->driver->ops->tiocmget(tty);
afaae084	61	tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS);
b3190df6 SS	62	mdelay(20);
	63
	64	/* Set RTS, wake up board */
632f32e2	65	tty->driver->ops->tiocmget(tty);
afaae084	66	tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00);
b3190df6 SS	67	mdelay(20);
b3190df6 SS	68
afaae084	69	status = tty->driver->ops->tiocmget(tty);
b3190df6 SS	70	return status;
	71	}
	72
	73	static void ath_hci_uart_work(struct work_struct *work)
	74	{
	75	int status;
	76	struct ath_struct *ath;
	77	struct hci_uart *hu;
	78	struct tty_struct *tty;
	79
	80	ath = container_of(work, struct ath_struct, ctxtsw);
	81
	82	hu = ath->hu;
	83	tty = hu->tty;
	84
	85	/* verify and wake up controller */
	86	if (ath->cur_sleep) {
	87	status = ath_wakeup_ar3k(tty);
	88	if (!(status & TIOCM_CTS))
	89	return;
	90	}
	91
	92	/* Ready to send Data */
	93	clear_bit(HCI_UART_SENDING, &hu->tx_state);
	94	hci_uart_tx_wakeup(hu);
	95	}
	96
	97	/* Initialize protocol */
	98	static int ath_open(struct hci_uart *hu)
	99	{
	100	struct ath_struct *ath;
	101
	102	BT_DBG("hu %p", hu);
	103
f5fd5bae	104	ath = kzalloc(sizeof(*ath), GFP_KERNEL);
b3190df6 SS	105	if (!ath)
	106	return -ENOMEM;
	107
	108	skb_queue_head_init(&ath->txq);
	109
	110	hu->priv = ath;
	111	ath->hu = hu;
	112
	113	INIT_WORK(&ath->ctxtsw, ath_hci_uart_work);
	114
	115	return 0;
	116	}
	117
	118	/* Flush protocol data */
	119	static int ath_flush(struct hci_uart *hu)
	120	{
	121	struct ath_struct *ath = hu->priv;
	122
	123	BT_DBG("hu %p", hu);
	124
	125	skb_queue_purge(&ath->txq);
	126
	127	return 0;
	128	}
	129
	130	/* Close protocol */
	131	static int ath_close(struct hci_uart *hu)
	132	{
	133	struct ath_struct *ath = hu->priv;
	134
	135	BT_DBG("hu %p", hu);
	136
	137	skb_queue_purge(&ath->txq);
	138
	139	cancel_work_sync(&ath->ctxtsw);
	140
	141	hu->priv = NULL;
	142	kfree(ath);
	143
	144	return 0;
	145	}
	146
	147	#define HCI_OP_ATH_SLEEP 0xFC04
	148
	149	/* Enqueue frame for transmittion */
	150	static int ath_enqueue(struct hci_uart hu, struct sk_buff skb)
	151	{
	152	struct ath_struct *ath = hu->priv;
	153
	154	if (bt_cb(skb)->pkt_type == HCI_SCODATA_PKT) {
4ebaa4ed	155	kfree_skb(skb);
b3190df6 SS	156	return 0;
	157	}
	158
	159	/*
	160	* Update power management enable flag with parameters of
	161	* HCI sleep enable vendor specific HCI command.
	162	*/
	163	if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
	164	struct hci_command_hdr hdr = (void )skb->data;
	165
	166	if (__le16_to_cpu(hdr->opcode) == HCI_OP_ATH_SLEEP)
	167	ath->cur_sleep = skb->data[HCI_COMMAND_HDR_SIZE];
	168	}
	169
	170	BT_DBG("hu %p skb %p", hu, skb);
	171
	172	/* Prepend skb with frame type */
	173	memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
	174
	175	skb_queue_tail(&ath->txq, skb);
	176	set_bit(HCI_UART_SENDING, &hu->tx_state);
	177
	178	schedule_work(&ath->ctxtsw);
	179
	180	return 0;
	181	}
	182
	183	static struct sk_buff ath_dequeue(struct hci_uart hu)
	184	{
	185	struct ath_struct *ath = hu->priv;
	186
	187	return skb_dequeue(&ath->txq);
	188	}
	189
	190	/* Recv data */
	191	static int ath_recv(struct hci_uart hu, void data, int count)
	192	{
78b4a56c JZ	193	int ret;
	194
	195	ret = hci_recv_stream_fragment(hu->hdev, data, count);
	196	if (ret < 0) {
b3190df6	197	BT_ERR("Frame Reassembly Failed");
78b4a56c JZ	198	return ret;
78b4a56c JZ	199	}
b3190df6 SS	200
	201	return count;
	202	}
	203
	204	static struct hci_uart_proto athp = {
	205	.id = HCI_UART_ATH3K,
	206	.open = ath_open,
	207	.close = ath_close,
	208	.recv = ath_recv,
	209	.enqueue = ath_enqueue,
	210	.dequeue = ath_dequeue,
	211	.flush = ath_flush,
	212	};
	213
f2b94bb9	214	int __init ath_init(void)
b3190df6 SS	215	{
	216	int err = hci_uart_register_proto(&athp);
	217
	218	if (!err)
	219	BT_INFO("HCIATH3K protocol initialized");
	220	else
	221	BT_ERR("HCIATH3K protocol registration failed");
	222
	223	return err;
	224	}
	225
f2b94bb9	226	int __exit ath_deinit(void)
b3190df6 SS	227	{
	228	return hci_uart_unregister_proto(&athp);
	229	}