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

/*
 *
 *  Bluetooth HCI UART driver
 *
 *  Copyright (C) 2000-2001  Qualcomm Incorporated
 *  Copyright (C) 2002-2003  Maxim Krasnyansky <maxk@qualcomm.com>
 *  Copyright (C) 2004-2005  Marcel Holtmann <marcel@holtmann.org>
 *
 *
 *  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/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/poll.h>

#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/signal.h>
#include <linux/ioctl.h>
#include <linux/skbuff.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>

#include "hci_uart.h"

#define VERSION "2.3"

static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];

int hci_uart_register_proto(const struct hci_uart_proto *p)
{
	if (p->id >= HCI_UART_MAX_PROTO)
		return -EINVAL;

	if (hup[p->id])
		return -EEXIST;

	hup[p->id] = p;

	BT_INFO("HCI UART protocol %s registered", p->name);

	return 0;
}

int hci_uart_unregister_proto(const struct hci_uart_proto *p)
{
	if (p->id >= HCI_UART_MAX_PROTO)
		return -EINVAL;

	if (!hup[p->id])
		return -EINVAL;

	hup[p->id] = NULL;

	return 0;
}

static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
{
	if (id >= HCI_UART_MAX_PROTO)
		return NULL;

	return hup[id];
}

static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
{
	struct hci_dev *hdev = hu->hdev;

	/* Update HCI stat counters */
	switch (pkt_type) {
	case HCI_COMMAND_PKT:
		hdev->stat.cmd_tx++;
		break;

	case HCI_ACLDATA_PKT:
		hdev->stat.acl_tx++;
		break;

	case HCI_SCODATA_PKT:
		hdev->stat.sco_tx++;
		break;
	}
}

static inline struct sk_buff *hci_uart_dequeue(struct hci_uart *hu)
{
	struct sk_buff *skb = hu->tx_skb;

	if (!skb)
		skb = hu->proto->dequeue(hu);
	else
		hu->tx_skb = NULL;

	return skb;
}

int hci_uart_tx_wakeup(struct hci_uart *hu)
{
	if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
		set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
		return 0;
	}

	BT_DBG("");

	schedule_work(&hu->write_work);

	return 0;
}

static void hci_uart_write_work(struct work_struct *work)
{
	struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
	struct tty_struct *tty = hu->tty;
	struct hci_dev *hdev = hu->hdev;
	struct sk_buff *skb;

	/* REVISIT: should we cope with bad skbs or ->write() returning
	 * and error value ?
	 */

restart:
	clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);

	while ((skb = hci_uart_dequeue(hu))) {
		int len;

		set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
		len = tty->ops->write(tty, skb->data, skb->len);
		hdev->stat.byte_tx += len;

		skb_pull(skb, len);
		if (skb->len) {
			hu->tx_skb = skb;
			break;
		}

		hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
		kfree_skb(skb);
	}

	if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
		goto restart;

	clear_bit(HCI_UART_SENDING, &hu->tx_state);
}

static void hci_uart_init_work(struct work_struct *work)
{
	struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
	int err;

	if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
		return;

	err = hci_register_dev(hu->hdev);
	if (err < 0) {
		BT_ERR("Can't register HCI device");
		hci_free_dev(hu->hdev);
		hu->hdev = NULL;
		hu->proto->close(hu);
	}

	set_bit(HCI_UART_REGISTERED, &hu->flags);
}

int hci_uart_init_ready(struct hci_uart *hu)
{
	if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
		return -EALREADY;

	schedule_work(&hu->init_ready);

	return 0;
}

/* ------- Interface to HCI layer ------ */
/* Initialize device */
static int hci_uart_open(struct hci_dev *hdev)
{
	BT_DBG("%s %p", hdev->name, hdev);

	/* Nothing to do for UART driver */

	set_bit(HCI_RUNNING, &hdev->flags);

	return 0;
}

/* Reset device */
static int hci_uart_flush(struct hci_dev *hdev)
{
	struct hci_uart *hu  = hci_get_drvdata(hdev);
	struct tty_struct *tty = hu->tty;

	BT_DBG("hdev %p tty %p", hdev, tty);

	if (hu->tx_skb) {
		kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
	}

	/* Flush any pending characters in the driver and discipline. */
	tty_ldisc_flush(tty);
	tty_driver_flush_buffer(tty);

	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
		hu->proto->flush(hu);

	return 0;
}

/* Close device */
static int hci_uart_close(struct hci_dev *hdev)
{
	BT_DBG("hdev %p", hdev);

	if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
		return 0;

	hci_uart_flush(hdev);
	hdev->flush = NULL;
	return 0;
}

/* Send frames from HCI layer */
static int hci_uart_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
{
	struct hci_uart *hu = hci_get_drvdata(hdev);

	if (!test_bit(HCI_RUNNING, &hdev->flags))
		return -EBUSY;

	BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);

	hu->proto->enqueue(hu, skb);

	hci_uart_tx_wakeup(hu);

	return 0;
}

static int hci_uart_setup(struct hci_dev *hdev)
{
	struct hci_uart *hu = hci_get_drvdata(hdev);
	struct hci_rp_read_local_version *ver;
	struct sk_buff *skb;

	if (hu->proto->setup)
		return hu->proto->setup(hu);

	if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
		return 0;

	skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
			     HCI_INIT_TIMEOUT);
	if (IS_ERR(skb)) {
		BT_ERR("%s: Reading local version information failed (%ld)",
		       hdev->name, PTR_ERR(skb));
		return 0;
	}

	if (skb->len != sizeof(*ver)) {
		BT_ERR("%s: Event length mismatch for version information",
		       hdev->name);
		goto done;
	}

	ver = (struct hci_rp_read_local_version *)skb->data;

	switch (le16_to_cpu(ver->manufacturer)) {
#ifdef CONFIG_BT_HCIUART_INTEL
	case 2:
		hdev->set_bdaddr = intel_set_bdaddr;
		break;
#endif
#ifdef CONFIG_BT_HCIUART_BCM
	case 15:
		hdev->set_bdaddr = bcm_set_bdaddr;
		break;
#endif
	}

done:
	kfree_skb(skb);
	return 0;
}

/* ------ LDISC part ------ */
/* hci_uart_tty_open
 *
 *     Called when line discipline changed to HCI_UART.
 *
 * Arguments:
 *     tty    pointer to tty info structure
 * Return Value:
 *     0 if success, otherwise error code
 */
static int hci_uart_tty_open(struct tty_struct *tty)
{
	struct hci_uart *hu;

	BT_DBG("tty %p", tty);

	/* Error if the tty has no write op instead of leaving an exploitable
	   hole */
	if (tty->ops->write == NULL)
		return -EOPNOTSUPP;

	hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
	if (!hu) {
		BT_ERR("Can't allocate control structure");
		return -ENFILE;
	}

	tty->disc_data = hu;
	hu->tty = tty;
	tty->receive_room = 65536;

	INIT_WORK(&hu->init_ready, hci_uart_init_work);
	INIT_WORK(&hu->write_work, hci_uart_write_work);

	spin_lock_init(&hu->rx_lock);

	/* Flush any pending characters in the driver and line discipline. */

	/* FIXME: why is this needed. Note don't use ldisc_ref here as the
	   open path is before the ldisc is referencable */

	if (tty->ldisc->ops->flush_buffer)
		tty->ldisc->ops->flush_buffer(tty);
	tty_driver_flush_buffer(tty);

	return 0;
}

/* hci_uart_tty_close()
 *
 *    Called when the line discipline is changed to something
 *    else, the tty is closed, or the tty detects a hangup.
 */
static void hci_uart_tty_close(struct tty_struct *tty)
{
	struct hci_uart *hu = tty->disc_data;
	struct hci_dev *hdev;

	BT_DBG("tty %p", tty);

	/* Detach from the tty */
	tty->disc_data = NULL;

	if (!hu)
		return;

	hdev = hu->hdev;
	if (hdev)
		hci_uart_close(hdev);

	cancel_work_sync(&hu->write_work);

	if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
		if (hdev) {
			if (test_bit(HCI_UART_REGISTERED, &hu->flags))
				hci_unregister_dev(hdev);
			hci_free_dev(hdev);
		}
		hu->proto->close(hu);
	}

	kfree(hu);
}

/* hci_uart_tty_wakeup()
 *
 *    Callback for transmit wakeup. Called when low level
 *    device driver can accept more send data.
 *
 * Arguments:        tty    pointer to associated tty instance data
 * Return Value:    None
 */
static void hci_uart_tty_wakeup(struct tty_struct *tty)
{
	struct hci_uart *hu = tty->disc_data;

	BT_DBG("");

	if (!hu)
		return;

	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);

	if (tty != hu->tty)
		return;

	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
		hci_uart_tx_wakeup(hu);
}

/* hci_uart_tty_receive()
 *
 *     Called by tty low level driver when receive data is
 *     available.
 *
 * Arguments:  tty          pointer to tty isntance data
 *             data         pointer to received data
 *             flags        pointer to flags for data
 *             count        count of received data in bytes
 *
 * Return Value:    None
 */
static void hci_uart_tty_receive(struct tty_struct *tty, const u8 *data,
				 char *flags, int count)
{
	struct hci_uart *hu = tty->disc_data;

	if (!hu || tty != hu->tty)
		return;

	if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
		return;

	spin_lock(&hu->rx_lock);
	hu->proto->recv(hu, data, count);

	if (hu->hdev)
		hu->hdev->stat.byte_rx += count;

	spin_unlock(&hu->rx_lock);

	tty_unthrottle(tty);
}

static int hci_uart_register_dev(struct hci_uart *hu)
{
	struct hci_dev *hdev;

	BT_DBG("");

	/* Initialize and register HCI device */
	hdev = hci_alloc_dev();
	if (!hdev) {
		BT_ERR("Can't allocate HCI device");
		return -ENOMEM;
	}

	hu->hdev = hdev;

	hdev->bus = HCI_UART;
	hci_set_drvdata(hdev, hu);

	hdev->open  = hci_uart_open;
	hdev->close = hci_uart_close;
	hdev->flush = hci_uart_flush;
	hdev->send  = hci_uart_send_frame;
	hdev->setup = hci_uart_setup;
	SET_HCIDEV_DEV(hdev, hu->tty->dev);

	if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
		set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);

	if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
		set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);

	if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
		set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);

	if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
		hdev->dev_type = HCI_AMP;
	else
		hdev->dev_type = HCI_BREDR;

	if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
		return 0;

	if (hci_register_dev(hdev) < 0) {
		BT_ERR("Can't register HCI device");
		hci_free_dev(hdev);
		return -ENODEV;
	}

	set_bit(HCI_UART_REGISTERED, &hu->flags);

	return 0;
}

static int hci_uart_set_proto(struct hci_uart *hu, int id)
{
	const struct hci_uart_proto *p;
	int err;

	p = hci_uart_get_proto(id);
	if (!p)
		return -EPROTONOSUPPORT;

	err = p->open(hu);
	if (err)
		return err;

	hu->proto = p;

	err = hci_uart_register_dev(hu);
	if (err) {
		p->close(hu);
		return err;
	}

	return 0;
}

static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
{
	unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) |
				    BIT(HCI_UART_RESET_ON_INIT) |
				    BIT(HCI_UART_CREATE_AMP) |
				    BIT(HCI_UART_INIT_PENDING) |
				    BIT(HCI_UART_EXT_CONFIG) |
				    BIT(HCI_UART_VND_DETECT);

	if (flags & ~valid_flags)
		return -EINVAL;

	hu->hdev_flags = flags;

	return 0;
}

/* hci_uart_tty_ioctl()
 *
 *    Process IOCTL system call for the tty device.
 *
 * Arguments:
 *
 *    tty        pointer to tty instance data
 *    file       pointer to open file object for device
 *    cmd        IOCTL command code
 *    arg        argument for IOCTL call (cmd dependent)
 *
 * Return Value:    Command dependent
 */
static int hci_uart_tty_ioctl(struct tty_struct *tty, struct file *file,
			      unsigned int cmd, unsigned long arg)
{
	struct hci_uart *hu = tty->disc_data;
	int err = 0;

	BT_DBG("");

	/* Verify the status of the device */
	if (!hu)
		return -EBADF;

	switch (cmd) {
	case HCIUARTSETPROTO:
		if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
			err = hci_uart_set_proto(hu, arg);
			if (err) {
				clear_bit(HCI_UART_PROTO_SET, &hu->flags);
				return err;
			}
		} else
			return -EBUSY;
		break;

	case HCIUARTGETPROTO:
		if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
			return hu->proto->id;
		return -EUNATCH;

	case HCIUARTGETDEVICE:
		if (test_bit(HCI_UART_REGISTERED, &hu->flags))
			return hu->hdev->id;
		return -EUNATCH;

	case HCIUARTSETFLAGS:
		if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
			return -EBUSY;
		err = hci_uart_set_flags(hu, arg);
		if (err)
			return err;
		break;

	case HCIUARTGETFLAGS:
		return hu->hdev_flags;

	default:
		err = n_tty_ioctl_helper(tty, file, cmd, arg);
		break;
	}

	return err;
}

/*
 * We don't provide read/write/poll interface for user space.
 */
static ssize_t hci_uart_tty_read(struct tty_struct *tty, struct file *file,
				 unsigned char __user *buf, size_t nr)
{
	return 0;
}

static ssize_t hci_uart_tty_write(struct tty_struct *tty, struct file *file,
				  const unsigned char *data, size_t count)
{
	return 0;
}

static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
				      struct file *filp, poll_table *wait)
{
	return 0;
}

static int __init hci_uart_init(void)
{
	static struct tty_ldisc_ops hci_uart_ldisc;
	int err;

	BT_INFO("HCI UART driver ver %s", VERSION);

	/* Register the tty discipline */

	memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
	hci_uart_ldisc.magic		= TTY_LDISC_MAGIC;
	hci_uart_ldisc.name		= "n_hci";
	hci_uart_ldisc.open		= hci_uart_tty_open;
	hci_uart_ldisc.close		= hci_uart_tty_close;
	hci_uart_ldisc.read		= hci_uart_tty_read;
	hci_uart_ldisc.write		= hci_uart_tty_write;
	hci_uart_ldisc.ioctl		= hci_uart_tty_ioctl;
	hci_uart_ldisc.poll		= hci_uart_tty_poll;
	hci_uart_ldisc.receive_buf	= hci_uart_tty_receive;
	hci_uart_ldisc.write_wakeup	= hci_uart_tty_wakeup;
	hci_uart_ldisc.owner		= THIS_MODULE;

	err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
	if (err) {
		BT_ERR("HCI line discipline registration failed. (%d)", err);
		return err;
	}

#ifdef CONFIG_BT_HCIUART_H4
	h4_init();
#endif
#ifdef CONFIG_BT_HCIUART_BCSP
	bcsp_init();
#endif
#ifdef CONFIG_BT_HCIUART_LL
	ll_init();
#endif
#ifdef CONFIG_BT_HCIUART_ATH3K
	ath_init();
#endif
#ifdef CONFIG_BT_HCIUART_3WIRE
	h5_init();
#endif

	return 0;
}

static void __exit hci_uart_exit(void)
{
	int err;

#ifdef CONFIG_BT_HCIUART_H4
	h4_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_BCSP
	bcsp_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_LL
	ll_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_ATH3K
	ath_deinit();
#endif
#ifdef CONFIG_BT_HCIUART_3WIRE
	h5_deinit();
#endif

	/* Release tty registration of line discipline */
	err = tty_unregister_ldisc(N_HCI);
	if (err)
		BT_ERR("Can't unregister HCI line discipline (%d)", err);
}

module_init(hci_uart_init);
module_exit(hci_uart_exit);

MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");
MODULE_ALIAS_LDISC(N_HCI);
Commit	Line	Data
1da177e4	1	/*
1da177e4	2	*
0372a662 MH	3	* Bluetooth HCI UART driver
	4	*
	5	* Copyright (C) 2000-2001 Qualcomm Incorporated
	6	* Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
	7	* Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org>
	8	*
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	23	*
1da177e4	24	*/
1da177e4	25
1da177e4 LT	26	#include <linux/module.h>
	27
	28	#include <linux/kernel.h>
	29	#include <linux/init.h>
1da177e4 LT	30	#include <linux/types.h>
	31	#include <linux/fcntl.h>
	32	#include <linux/interrupt.h>
	33	#include <linux/ptrace.h>
	34	#include <linux/poll.h>
	35
	36	#include <linux/slab.h>
	37	#include <linux/tty.h>
	38	#include <linux/errno.h>
	39	#include <linux/string.h>
	40	#include <linux/signal.h>
	41	#include <linux/ioctl.h>
	42	#include <linux/skbuff.h>
	43
	44	#include <net/bluetooth/bluetooth.h>
	45	#include <net/bluetooth/hci_core.h>
	46
	47	#include "hci_uart.h"
	48
788a6756	49	#define VERSION "2.3"
0372a662	50
4ee7ef19	51	static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
1da177e4	52
4ee7ef19	53	int hci_uart_register_proto(const struct hci_uart_proto *p)
1da177e4 LT	54	{
	55	if (p->id >= HCI_UART_MAX_PROTO)
	56	return -EINVAL;
	57
	58	if (hup[p->id])
	59	return -EEXIST;
	60
	61	hup[p->id] = p;
0372a662	62
01009eec MH	63	BT_INFO("HCI UART protocol %s registered", p->name);
01009eec MH	64
1da177e4 LT	65	return 0;
	66	}
	67
4ee7ef19	68	int hci_uart_unregister_proto(const struct hci_uart_proto *p)
1da177e4 LT	69	{
	70	if (p->id >= HCI_UART_MAX_PROTO)
	71	return -EINVAL;
	72
	73	if (!hup[p->id])
	74	return -EINVAL;
	75
	76	hup[p->id] = NULL;
0372a662	77
1da177e4 LT	78	return 0;
	79	}
	80
4ee7ef19	81	static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
1da177e4 LT	82	{
	83	if (id >= HCI_UART_MAX_PROTO)
	84	return NULL;
0372a662	85
1da177e4 LT	86	return hup[id];
	87	}
	88
	89	static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
	90	{
	91	struct hci_dev *hdev = hu->hdev;
0372a662	92
1da177e4 LT	93	/* Update HCI stat counters */
	94	switch (pkt_type) {
	95	case HCI_COMMAND_PKT:
	96	hdev->stat.cmd_tx++;
	97	break;
	98
	99	case HCI_ACLDATA_PKT:
	100	hdev->stat.acl_tx++;
	101	break;
	102
	103	case HCI_SCODATA_PKT:
7f8f2729	104	hdev->stat.sco_tx++;
1da177e4 LT	105	break;
	106	}
	107	}
	108
	109	static inline struct sk_buff hci_uart_dequeue(struct hci_uart hu)
	110	{
	111	struct sk_buff *skb = hu->tx_skb;
0372a662	112
1da177e4 LT	113	if (!skb)
	114	skb = hu->proto->dequeue(hu);
	115	else
	116	hu->tx_skb = NULL;
0372a662	117
1da177e4 LT	118	return skb;
	119	}
	120
	121	int hci_uart_tx_wakeup(struct hci_uart *hu)
	122	{
1da177e4 LT	123	if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
	124	set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
	125	return 0;
	126	}
	127
	128	BT_DBG("");
	129
da64c27d FB	130	schedule_work(&hu->write_work);
	131
	132	return 0;
	133	}
	134
	135	static void hci_uart_write_work(struct work_struct *work)
	136	{
	137	struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
	138	struct tty_struct *tty = hu->tty;
	139	struct hci_dev *hdev = hu->hdev;
	140	struct sk_buff *skb;
	141
	142	/* REVISIT: should we cope with bad skbs or ->write() returning
	143	* and error value ?
	144	*/
	145
1da177e4 LT	146	restart:
	147	clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
	148
	149	while ((skb = hci_uart_dequeue(hu))) {
	150	int len;
0372a662	151
1da177e4	152	set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
f34d7a5b	153	len = tty->ops->write(tty, skb->data, skb->len);
1da177e4 LT	154	hdev->stat.byte_tx += len;
	155
	156	skb_pull(skb, len);
	157	if (skb->len) {
	158	hu->tx_skb = skb;
	159	break;
	160	}
0372a662	161
0d48d939	162	hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
1da177e4	163	kfree_skb(skb);
0372a662 MH	164	}
0372a662 MH	165
1da177e4 LT	166	if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
	167	goto restart;
	168
	169	clear_bit(HCI_UART_SENDING, &hu->tx_state);
1da177e4 LT	170	}
1da177e4 LT	171
9f2aee84 JH	172	static void hci_uart_init_work(struct work_struct *work)
	173	{
	174	struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
	175	int err;
	176
	177	if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
	178	return;
	179
	180	err = hci_register_dev(hu->hdev);
	181	if (err < 0) {
	182	BT_ERR("Can't register HCI device");
	183	hci_free_dev(hu->hdev);
	184	hu->hdev = NULL;
	185	hu->proto->close(hu);
	186	}
	187
	188	set_bit(HCI_UART_REGISTERED, &hu->flags);
	189	}
	190
	191	int hci_uart_init_ready(struct hci_uart *hu)
	192	{
	193	if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
	194	return -EALREADY;
	195
	196	schedule_work(&hu->init_ready);
	197
	198	return 0;
	199	}
	200
1da177e4 LT	201	/* ------- Interface to HCI layer ------ */
	202	/* Initialize device */
	203	static int hci_uart_open(struct hci_dev *hdev)
	204	{
	205	BT_DBG("%s %p", hdev->name, hdev);
	206
	207	/* Nothing to do for UART driver */
	208
	209	set_bit(HCI_RUNNING, &hdev->flags);
0372a662	210
1da177e4 LT	211	return 0;
	212	}
	213
	214	/* Reset device */
	215	static int hci_uart_flush(struct hci_dev *hdev)
	216	{
155961e8	217	struct hci_uart *hu = hci_get_drvdata(hdev);
1da177e4 LT	218	struct tty_struct *tty = hu->tty;
	219
	220	BT_DBG("hdev %p tty %p", hdev, tty);
	221
	222	if (hu->tx_skb) {
	223	kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
	224	}
	225
	226	/* Flush any pending characters in the driver and discipline. */
	227	tty_ldisc_flush(tty);
f34d7a5b	228	tty_driver_flush_buffer(tty);
1da177e4 LT	229
	230	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	231	hu->proto->flush(hu);
	232
	233	return 0;
	234	}
	235
	236	/* Close device */
	237	static int hci_uart_close(struct hci_dev *hdev)
	238	{
	239	BT_DBG("hdev %p", hdev);
	240
	241	if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
	242	return 0;
	243
	244	hci_uart_flush(hdev);
3611f4d2	245	hdev->flush = NULL;
1da177e4 LT	246	return 0;
	247	}
	248
	249	/* Send frames from HCI layer */
7bd8f09f	250	static int hci_uart_send_frame(struct hci_dev hdev, struct sk_buff skb)
1da177e4	251	{
52bc423a	252	struct hci_uart *hu = hci_get_drvdata(hdev);
1da177e4 LT	253
	254	if (!test_bit(HCI_RUNNING, &hdev->flags))
	255	return -EBUSY;
	256
0d48d939	257	BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
1da177e4 LT	258
	259	hu->proto->enqueue(hu, skb);
	260
	261	hci_uart_tx_wakeup(hu);
0372a662	262
1da177e4 LT	263	return 0;
	264	}
	265
eb173809 LP	266	static int hci_uart_setup(struct hci_dev *hdev)
	267	{
	268	struct hci_uart *hu = hci_get_drvdata(hdev);
fb2ce8d1 MH	269	struct hci_rp_read_local_version *ver;
fb2ce8d1 MH	270	struct sk_buff *skb;
eb173809 LP	271
	272	if (hu->proto->setup)
	273	return hu->proto->setup(hu);
	274
fb2ce8d1 MH	275	if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
	276	return 0;
	277
	278	skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
	279	HCI_INIT_TIMEOUT);
	280	if (IS_ERR(skb)) {
	281	BT_ERR("%s: Reading local version information failed (%ld)",
	282	hdev->name, PTR_ERR(skb));
	283	return 0;
	284	}
	285
	286	if (skb->len != sizeof(*ver)) {
	287	BT_ERR("%s: Event length mismatch for version information",
	288	hdev->name);
	289	goto done;
	290	}
	291
	292	ver = (struct hci_rp_read_local_version *)skb->data;
	293
	294	switch (le16_to_cpu(ver->manufacturer)) {
16e3887f MH	295	#ifdef CONFIG_BT_HCIUART_INTEL
	296	case 2:
	297	hdev->set_bdaddr = intel_set_bdaddr;
	298	break;
e9a2dd26 MH	299	#endif
	300	#ifdef CONFIG_BT_HCIUART_BCM
	301	case 15:
	302	hdev->set_bdaddr = bcm_set_bdaddr;
	303	break;
16e3887f	304	#endif
fb2ce8d1 MH	305	}
	306
	307	done:
	308	kfree_skb(skb);
eb173809 LP	309	return 0;
	310	}
	311
1da177e4 LT	312	/* ------ LDISC part ------ */
1da177e4 LT	313	/* hci_uart_tty_open
1687dfc3	314	*
1da177e4 LT	315	* Called when line discipline changed to HCI_UART.
	316	*
	317	* Arguments:
	318	* tty pointer to tty info structure
1687dfc3	319	* Return Value:
1da177e4 LT	320	* 0 if success, otherwise error code
	321	*/
	322	static int hci_uart_tty_open(struct tty_struct *tty)
	323	{
f327b340	324	struct hci_uart *hu;
1da177e4 LT	325
	326	BT_DBG("tty %p", tty);
	327
c19483cc AC	328	/* Error if the tty has no write op instead of leaving an exploitable
	329	hole */
	330	if (tty->ops->write == NULL)
	331	return -EOPNOTSUPP;
	332
a08b15e6 VI	333	hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
a08b15e6 VI	334	if (!hu) {
7785162c	335	BT_ERR("Can't allocate control structure");
1da177e4 LT	336	return -ENFILE;
1da177e4 LT	337	}
0372a662	338
1da177e4 LT	339	tty->disc_data = hu;
1da177e4 LT	340	hu->tty = tty;
33f0f88f	341	tty->receive_room = 65536;
1da177e4	342
9f2aee84	343	INIT_WORK(&hu->init_ready, hci_uart_init_work);
da64c27d	344	INIT_WORK(&hu->write_work, hci_uart_write_work);
9f2aee84	345
1da177e4 LT	346	spin_lock_init(&hu->rx_lock);
	347
	348	/* Flush any pending characters in the driver and line discipline. */
0372a662	349
1da177e4 LT	350	/* FIXME: why is this needed. Note don't use ldisc_ref here as the
1da177e4 LT	351	open path is before the ldisc is referencable */
0372a662	352
c65c9bc3 AC	353	if (tty->ldisc->ops->flush_buffer)
c65c9bc3 AC	354	tty->ldisc->ops->flush_buffer(tty);
f34d7a5b	355	tty_driver_flush_buffer(tty);
1da177e4 LT	356
	357	return 0;
	358	}
	359
	360	/* hci_uart_tty_close()
	361	*
	362	* Called when the line discipline is changed to something
	363	* else, the tty is closed, or the tty detects a hangup.
	364	*/
	365	static void hci_uart_tty_close(struct tty_struct *tty)
	366	{
dfe19d28	367	struct hci_uart *hu = tty->disc_data;
dac670b9	368	struct hci_dev *hdev;
1da177e4 LT	369
	370	BT_DBG("tty %p", tty);
	371
	372	/* Detach from the tty */
	373	tty->disc_data = NULL;
	374
dac670b9 JH	375	if (!hu)
dac670b9 JH	376	return;
22ad4203	377
dac670b9 JH	378	hdev = hu->hdev;
	379	if (hdev)
	380	hci_uart_close(hdev);
1da177e4	381
da64c27d FB	382	cancel_work_sync(&hu->write_work);
da64c27d FB	383
dac670b9 JH	384	if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
dac670b9 JH	385	if (hdev) {
9f2aee84 JH	386	if (test_bit(HCI_UART_REGISTERED, &hu->flags))
9f2aee84 JH	387	hci_unregister_dev(hdev);
dac670b9	388	hci_free_dev(hdev);
1da177e4	389	}
dac670b9	390	hu->proto->close(hu);
1da177e4	391	}
dac670b9 JH	392
dac670b9 JH	393	kfree(hu);
1da177e4 LT	394	}
	395
	396	/* hci_uart_tty_wakeup()
	397	*
	398	* Callback for transmit wakeup. Called when low level
	399	* device driver can accept more send data.
	400	*
	401	* Arguments: tty pointer to associated tty instance data
	402	* Return Value: None
	403	*/
	404	static void hci_uart_tty_wakeup(struct tty_struct *tty)
	405	{
dfe19d28	406	struct hci_uart *hu = tty->disc_data;
1da177e4 LT	407
	408	BT_DBG("");
	409
	410	if (!hu)
	411	return;
	412
	413	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
	414
	415	if (tty != hu->tty)
	416	return;
	417
	418	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	419	hci_uart_tx_wakeup(hu);
	420	}
	421
1da177e4	422	/* hci_uart_tty_receive()
1687dfc3	423	*
1da177e4 LT	424	* Called by tty low level driver when receive data is
1da177e4 LT	425	* available.
1687dfc3	426	*
1da177e4 LT	427	* Arguments: tty pointer to tty isntance data
	428	* data pointer to received data
	429	* flags pointer to flags for data
	430	* count count of received data in bytes
1687dfc3	431	*
55db4c64	432	* Return Value: None
1da177e4	433	*/
facf5225 MH	434	static void hci_uart_tty_receive(struct tty_struct tty, const u8 data,
facf5225 MH	435	char *flags, int count)
1da177e4	436	{
dfe19d28	437	struct hci_uart *hu = tty->disc_data;
0372a662	438
1da177e4	439	if (!hu \|\| tty != hu->tty)
55db4c64	440	return;
1da177e4 LT	441
1da177e4 LT	442	if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
55db4c64	443	return;
0372a662	444
1da177e4	445	spin_lock(&hu->rx_lock);
9d1c40eb	446	hu->proto->recv(hu, data, count);
788f0923 CP	447
	448	if (hu->hdev)
	449	hu->hdev->stat.byte_rx += count;
	450
1da177e4 LT	451	spin_unlock(&hu->rx_lock);
1da177e4 LT	452
39c2e60f	453	tty_unthrottle(tty);
1da177e4 LT	454	}
	455
	456	static int hci_uart_register_dev(struct hci_uart *hu)
	457	{
	458	struct hci_dev *hdev;
	459
	460	BT_DBG("");
	461
	462	/* Initialize and register HCI device */
	463	hdev = hci_alloc_dev();
	464	if (!hdev) {
	465	BT_ERR("Can't allocate HCI device");
	466	return -ENOMEM;
	467	}
	468
	469	hu->hdev = hdev;
	470
c13854ce	471	hdev->bus = HCI_UART;
155961e8	472	hci_set_drvdata(hdev, hu);
1da177e4 LT	473
	474	hdev->open = hci_uart_open;
	475	hdev->close = hci_uart_close;
	476	hdev->flush = hci_uart_flush;
	477	hdev->send = hci_uart_send_frame;
eb173809	478	hdev->setup = hci_uart_setup;
6935e0f5	479	SET_HCIDEV_DEV(hdev, hu->tty->dev);
1da177e4	480
63c7d09c JH	481	if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
	482	set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
	483
6afd04ad MH	484	if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
	485	set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
	486
a55e1f38	487	if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
a6c511c6	488	set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
a55e1f38	489
8a7a3fd6 MH	490	if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
	491	hdev->dev_type = HCI_AMP;
	492	else
	493	hdev->dev_type = HCI_BREDR;
	494
9f2aee84 JH	495	if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
	496	return 0;
	497
1da177e4 LT	498	if (hci_register_dev(hdev) < 0) {
	499	BT_ERR("Can't register HCI device");
	500	hci_free_dev(hdev);
	501	return -ENODEV;
	502	}
	503
9f2aee84 JH	504	set_bit(HCI_UART_REGISTERED, &hu->flags);
9f2aee84 JH	505
1da177e4 LT	506	return 0;
	507	}
	508
	509	static int hci_uart_set_proto(struct hci_uart *hu, int id)
	510	{
4ee7ef19	511	const struct hci_uart_proto *p;
0372a662 MH	512	int err;
0372a662 MH	513
1da177e4 LT	514	p = hci_uart_get_proto(id);
	515	if (!p)
	516	return -EPROTONOSUPPORT;
	517
	518	err = p->open(hu);
	519	if (err)
	520	return err;
	521
	522	hu->proto = p;
	523
	524	err = hci_uart_register_dev(hu);
	525	if (err) {
	526	p->close(hu);
	527	return err;
	528	}
0372a662	529
1da177e4 LT	530	return 0;
	531	}
	532
bb72bd68 MH	533	static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
	534	{
	535	unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) \|
	536	BIT(HCI_UART_RESET_ON_INIT) \|
	537	BIT(HCI_UART_CREATE_AMP) \|
6afd04ad	538	BIT(HCI_UART_INIT_PENDING) \|
fb2ce8d1 MH	539	BIT(HCI_UART_EXT_CONFIG) \|
fb2ce8d1 MH	540	BIT(HCI_UART_VND_DETECT);
bb72bd68	541
41533fe5	542	if (flags & ~valid_flags)
bb72bd68 MH	543	return -EINVAL;
	544
	545	hu->hdev_flags = flags;
	546
	547	return 0;
	548	}
	549
1da177e4 LT	550	/* hci_uart_tty_ioctl()
	551	*
	552	* Process IOCTL system call for the tty device.
	553	*
	554	* Arguments:
	555	*
	556	* tty pointer to tty instance data
	557	* file pointer to open file object for device
	558	* cmd IOCTL command code
	559	* arg argument for IOCTL call (cmd dependent)
	560	*
	561	* Return Value: Command dependent
	562	*/
facf5225 MH	563	static int hci_uart_tty_ioctl(struct tty_struct tty, struct file file,
facf5225 MH	564	unsigned int cmd, unsigned long arg)
1da177e4	565	{
dfe19d28	566	struct hci_uart *hu = tty->disc_data;
1da177e4 LT	567	int err = 0;
	568
	569	BT_DBG("");
	570
	571	/* Verify the status of the device */
	572	if (!hu)
	573	return -EBADF;
	574
	575	switch (cmd) {
	576	case HCIUARTSETPROTO:
	577	if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
	578	err = hci_uart_set_proto(hu, arg);
	579	if (err) {
	580	clear_bit(HCI_UART_PROTO_SET, &hu->flags);
	581	return err;
	582	}
0372a662	583	} else
1da177e4	584	return -EBUSY;
c33be3c3	585	break;
1da177e4 LT	586
	587	case HCIUARTGETPROTO:
	588	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	589	return hu->proto->id;
	590	return -EUNATCH;
0372a662	591
d2158744	592	case HCIUARTGETDEVICE:
c7e0c141	593	if (test_bit(HCI_UART_REGISTERED, &hu->flags))
d2158744 MH	594	return hu->hdev->id;
	595	return -EUNATCH;
	596
63c7d09c JH	597	case HCIUARTSETFLAGS:
	598	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	599	return -EBUSY;
bb72bd68 MH	600	err = hci_uart_set_flags(hu, arg);
	601	if (err)
	602	return err;
63c7d09c JH	603	break;
	604
	605	case HCIUARTGETFLAGS:
	606	return hu->hdev_flags;
	607
1da177e4	608	default:
47afa7a5	609	err = n_tty_ioctl_helper(tty, file, cmd, arg);
1da177e4	610	break;
a20890d0	611	}
1da177e4 LT	612
	613	return err;
	614	}
	615
	616	/*
	617	* We don't provide read/write/poll interface for user space.
	618	*/
0372a662	619	static ssize_t hci_uart_tty_read(struct tty_struct tty, struct file file,
facf5225	620	unsigned char __user *buf, size_t nr)
1da177e4 LT	621	{
	622	return 0;
	623	}
0372a662 MH	624
0372a662 MH	625	static ssize_t hci_uart_tty_write(struct tty_struct tty, struct file file,
facf5225	626	const unsigned char *data, size_t count)
1da177e4 LT	627	{
	628	return 0;
	629	}
0372a662 MH	630
0372a662 MH	631	static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
facf5225	632	struct file filp, poll_table wait)
1da177e4 LT	633	{
	634	return 0;
	635	}
	636
1da177e4 LT	637	static int __init hci_uart_init(void)
1da177e4 LT	638	{
a352def2	639	static struct tty_ldisc_ops hci_uart_ldisc;
1da177e4 LT	640	int err;
	641
	642	BT_INFO("HCI UART driver ver %s", VERSION);
	643
	644	/* Register the tty discipline */
	645
	646	memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
0372a662 MH	647	hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
	648	hci_uart_ldisc.name = "n_hci";
	649	hci_uart_ldisc.open = hci_uart_tty_open;
	650	hci_uart_ldisc.close = hci_uart_tty_close;
	651	hci_uart_ldisc.read = hci_uart_tty_read;
	652	hci_uart_ldisc.write = hci_uart_tty_write;
	653	hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
	654	hci_uart_ldisc.poll = hci_uart_tty_poll;
0372a662 MH	655	hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
	656	hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
	657	hci_uart_ldisc.owner = THIS_MODULE;
1da177e4	658
a08b15e6 VI	659	err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
a08b15e6 VI	660	if (err) {
1da177e4 LT	661	BT_ERR("HCI line discipline registration failed. (%d)", err);
	662	return err;
	663	}
	664
	665	#ifdef CONFIG_BT_HCIUART_H4
	666	h4_init();
	667	#endif
	668	#ifdef CONFIG_BT_HCIUART_BCSP
	669	bcsp_init();
	670	#endif
166d2f6a OBC	671	#ifdef CONFIG_BT_HCIUART_LL
	672	ll_init();
	673	#endif
b3190df6 SS	674	#ifdef CONFIG_BT_HCIUART_ATH3K
	675	ath_init();
	676	#endif
7dec65c8 JH	677	#ifdef CONFIG_BT_HCIUART_3WIRE
	678	h5_init();
	679	#endif
166d2f6a	680
1da177e4 LT	681	return 0;
	682	}
	683
	684	static void __exit hci_uart_exit(void)
	685	{
	686	int err;
	687
	688	#ifdef CONFIG_BT_HCIUART_H4
	689	h4_deinit();
	690	#endif
	691	#ifdef CONFIG_BT_HCIUART_BCSP
	692	bcsp_deinit();
	693	#endif
166d2f6a OBC	694	#ifdef CONFIG_BT_HCIUART_LL
	695	ll_deinit();
	696	#endif
b3190df6 SS	697	#ifdef CONFIG_BT_HCIUART_ATH3K
	698	ath_deinit();
	699	#endif
7dec65c8 JH	700	#ifdef CONFIG_BT_HCIUART_3WIRE
	701	h5_deinit();
	702	#endif
1da177e4 LT	703
1da177e4 LT	704	/* Release tty registration of line discipline */
a08b15e6 VI	705	err = tty_unregister_ldisc(N_HCI);
a08b15e6 VI	706	if (err)
1da177e4 LT	707	BT_ERR("Can't unregister HCI line discipline (%d)", err);
	708	}
	709
	710	module_init(hci_uart_init);
	711	module_exit(hci_uart_exit);
	712
63fbd24e	713	MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1da177e4 LT	714	MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
	715	MODULE_VERSION(VERSION);
	716	MODULE_LICENSE("GPL");
	717	MODULE_ALIAS_LDISC(N_HCI);