[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 *rx_skb;
	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);

	kfree_skb(ath->rx_skb);

	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);
}

static const struct h4_recv_pkt ath_recv_pkts[] = {
	{ H4_RECV_ACL,   .recv = hci_recv_frame },
	{ H4_RECV_SCO,   .recv = hci_recv_frame },
	{ H4_RECV_EVENT, .recv = hci_recv_frame },
};

/* Recv data */
static int ath_recv(struct hci_uart *hu, const void *data, int count)
{
	struct ath_struct *ath = hu->priv;

	ath->rx_skb = h4_recv_buf(hu->hdev, ath->rx_skb, data, count,
				  ath_recv_pkts, ARRAY_SIZE(ath_recv_pkts));
	if (IS_ERR(ath->rx_skb)) {
		int err = PTR_ERR(ath->rx_skb);
		BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
		return err;
	}

	return count;
}

static const struct hci_uart_proto athp = {
	.id		= HCI_UART_ATH3K,
	.name		= "ATH3K",
	.open		= ath_open,
	.close		= ath_close,
	.recv		= ath_recv,
	.enqueue	= ath_enqueue,
	.dequeue	= ath_dequeue,
	.flush		= ath_flush,
};

int __init ath_init(void)
{
	return hci_uart_register_proto(&athp);
}

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
d90aa682	48	struct sk_buff *rx_skb;
b3190df6 SS	49	struct sk_buff_head txq;
	50	struct work_struct ctxtsw;
	51	};
	52
	53	static int ath_wakeup_ar3k(struct tty_struct *tty)
	54	{
afaae084	55	int status = tty->driver->ops->tiocmget(tty);
b3190df6 SS	56
	57	if (status & TIOCM_CTS)
	58	return status;
	59
b3190df6	60	/* Clear RTS first */
632f32e2	61	tty->driver->ops->tiocmget(tty);
afaae084	62	tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS);
b3190df6 SS	63	mdelay(20);
	64
	65	/* Set RTS, wake up board */
632f32e2	66	tty->driver->ops->tiocmget(tty);
afaae084	67	tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00);
b3190df6 SS	68	mdelay(20);
b3190df6 SS	69
afaae084	70	status = tty->driver->ops->tiocmget(tty);
b3190df6 SS	71	return status;
	72	}
	73
	74	static void ath_hci_uart_work(struct work_struct *work)
	75	{
	76	int status;
	77	struct ath_struct *ath;
	78	struct hci_uart *hu;
	79	struct tty_struct *tty;
	80
	81	ath = container_of(work, struct ath_struct, ctxtsw);
	82
	83	hu = ath->hu;
	84	tty = hu->tty;
	85
	86	/* verify and wake up controller */
	87	if (ath->cur_sleep) {
	88	status = ath_wakeup_ar3k(tty);
	89	if (!(status & TIOCM_CTS))
	90	return;
	91	}
	92
	93	/* Ready to send Data */
	94	clear_bit(HCI_UART_SENDING, &hu->tx_state);
	95	hci_uart_tx_wakeup(hu);
	96	}
	97
	98	/* Initialize protocol */
	99	static int ath_open(struct hci_uart *hu)
	100	{
	101	struct ath_struct *ath;
	102
	103	BT_DBG("hu %p", hu);
	104
f5fd5bae	105	ath = kzalloc(sizeof(*ath), GFP_KERNEL);
b3190df6 SS	106	if (!ath)
	107	return -ENOMEM;
	108
	109	skb_queue_head_init(&ath->txq);
	110
	111	hu->priv = ath;
	112	ath->hu = hu;
	113
	114	INIT_WORK(&ath->ctxtsw, ath_hci_uart_work);
	115
	116	return 0;
	117	}
	118
	119	/* Flush protocol data */
	120	static int ath_flush(struct hci_uart *hu)
	121	{
	122	struct ath_struct *ath = hu->priv;
	123
	124	BT_DBG("hu %p", hu);
	125
	126	skb_queue_purge(&ath->txq);
	127
	128	return 0;
	129	}
	130
	131	/* Close protocol */
	132	static int ath_close(struct hci_uart *hu)
	133	{
	134	struct ath_struct *ath = hu->priv;
	135
	136	BT_DBG("hu %p", hu);
	137
	138	skb_queue_purge(&ath->txq);
	139
d90aa682 MH	140	kfree_skb(ath->rx_skb);
d90aa682 MH	141
b3190df6 SS	142	cancel_work_sync(&ath->ctxtsw);
	143
	144	hu->priv = NULL;
	145	kfree(ath);
	146
	147	return 0;
	148	}
	149
	150	#define HCI_OP_ATH_SLEEP 0xFC04
	151
	152	/* Enqueue frame for transmittion */
	153	static int ath_enqueue(struct hci_uart hu, struct sk_buff skb)
	154	{
	155	struct ath_struct *ath = hu->priv;
	156
	157	if (bt_cb(skb)->pkt_type == HCI_SCODATA_PKT) {
4ebaa4ed	158	kfree_skb(skb);
b3190df6 SS	159	return 0;
	160	}
	161
	162	/*
	163	* Update power management enable flag with parameters of
	164	* HCI sleep enable vendor specific HCI command.
	165	*/
	166	if (bt_cb(skb)->pkt_type == HCI_COMMAND_PKT) {
	167	struct hci_command_hdr hdr = (void )skb->data;
	168
	169	if (__le16_to_cpu(hdr->opcode) == HCI_OP_ATH_SLEEP)
	170	ath->cur_sleep = skb->data[HCI_COMMAND_HDR_SIZE];
	171	}
	172
	173	BT_DBG("hu %p skb %p", hu, skb);
	174
	175	/* Prepend skb with frame type */
	176	memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
	177
	178	skb_queue_tail(&ath->txq, skb);
	179	set_bit(HCI_UART_SENDING, &hu->tx_state);
	180
	181	schedule_work(&ath->ctxtsw);
	182
	183	return 0;
	184	}
	185
	186	static struct sk_buff ath_dequeue(struct hci_uart hu)
	187	{
	188	struct ath_struct *ath = hu->priv;
	189
	190	return skb_dequeue(&ath->txq);
	191	}
	192
79b8df93 MH	193	static const struct h4_recv_pkt ath_recv_pkts[] = {
	194	{ H4_RECV_ACL, .recv = hci_recv_frame },
	195	{ H4_RECV_SCO, .recv = hci_recv_frame },
	196	{ H4_RECV_EVENT, .recv = hci_recv_frame },
	197	};
	198
b3190df6	199	/* Recv data */
9d1c40eb	200	static int ath_recv(struct hci_uart hu, const void data, int count)
b3190df6	201	{
d90aa682	202	struct ath_struct *ath = hu->priv;
78b4a56c	203
79b8df93 MH	204	ath->rx_skb = h4_recv_buf(hu->hdev, ath->rx_skb, data, count,
79b8df93 MH	205	ath_recv_pkts, ARRAY_SIZE(ath_recv_pkts));
d90aa682 MH	206	if (IS_ERR(ath->rx_skb)) {
	207	int err = PTR_ERR(ath->rx_skb);
	208	BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
	209	return err;
78b4a56c	210	}
b3190df6 SS	211
	212	return count;
	213	}
	214
4ee7ef19	215	static const struct hci_uart_proto athp = {
7c40fb8d MH	216	.id = HCI_UART_ATH3K,
	217	.name = "ATH3K",
	218	.open = ath_open,
	219	.close = ath_close,
	220	.recv = ath_recv,
	221	.enqueue = ath_enqueue,
	222	.dequeue = ath_dequeue,
	223	.flush = ath_flush,
b3190df6 SS	224	};
b3190df6 SS	225
f2b94bb9	226	int __init ath_init(void)
b3190df6	227	{
01009eec	228	return hci_uart_register_proto(&athp);
b3190df6 SS	229	}
b3190df6 SS	230
f2b94bb9	231	int __exit ath_deinit(void)
b3190df6 SS	232	{
	233	return hci_uart_unregister_proto(&athp);
	234	}