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

/*
 *
 *  Bluetooth HCI UART driver
 *
 *  Copyright (C) 2000-2001  Qualcomm Incorporated
 *  Copyright (C) 2002-2003  Maxim Krasnyansky <[email protected]>
 *  Copyright (C) 2004-2005  Marcel Holtmann <[email protected]>
 *
 *
 *  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 "btintel.h"
#include "btbcm.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 = btintel_set_bdaddr;
		btintel_check_bdaddr(hdev);
		break;
#endif
#ifdef CONFIG_BT_HCIUART_BCM
	case 15:
		hdev->set_bdaddr = btbcm_set_bdaddr;
		btbcm_check_bdaddr(hdev);
		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
#ifdef CONFIG_BT_HCIUART_BCM
	bcm_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
#ifdef CONFIG_BT_HCIUART_BCM
	bcm_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 <[email protected]>");
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 <[email protected]>
	7	* Copyright (C) 2004-2005 Marcel Holtmann <[email protected]>
	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
bca03c95	47	#include "btintel.h"
3e0ac12a	48	#include "btbcm.h"
1da177e4 LT	49	#include "hci_uart.h"
1da177e4 LT	50
788a6756	51	#define VERSION "2.3"
0372a662	52
4ee7ef19	53	static const struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
1da177e4	54
4ee7ef19	55	int hci_uart_register_proto(const struct hci_uart_proto *p)
1da177e4 LT	56	{
	57	if (p->id >= HCI_UART_MAX_PROTO)
	58	return -EINVAL;
	59
	60	if (hup[p->id])
	61	return -EEXIST;
	62
	63	hup[p->id] = p;
0372a662	64
01009eec MH	65	BT_INFO("HCI UART protocol %s registered", p->name);
01009eec MH	66
1da177e4 LT	67	return 0;
	68	}
	69
4ee7ef19	70	int hci_uart_unregister_proto(const struct hci_uart_proto *p)
1da177e4 LT	71	{
	72	if (p->id >= HCI_UART_MAX_PROTO)
	73	return -EINVAL;
	74
	75	if (!hup[p->id])
	76	return -EINVAL;
	77
	78	hup[p->id] = NULL;
0372a662	79
1da177e4 LT	80	return 0;
	81	}
	82
4ee7ef19	83	static const struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
1da177e4 LT	84	{
	85	if (id >= HCI_UART_MAX_PROTO)
	86	return NULL;
0372a662	87
1da177e4 LT	88	return hup[id];
	89	}
	90
	91	static inline void hci_uart_tx_complete(struct hci_uart *hu, int pkt_type)
	92	{
	93	struct hci_dev *hdev = hu->hdev;
0372a662	94
1da177e4 LT	95	/* Update HCI stat counters */
	96	switch (pkt_type) {
	97	case HCI_COMMAND_PKT:
	98	hdev->stat.cmd_tx++;
	99	break;
	100
	101	case HCI_ACLDATA_PKT:
	102	hdev->stat.acl_tx++;
	103	break;
	104
	105	case HCI_SCODATA_PKT:
7f8f2729	106	hdev->stat.sco_tx++;
1da177e4 LT	107	break;
	108	}
	109	}
	110
	111	static inline struct sk_buff hci_uart_dequeue(struct hci_uart hu)
	112	{
	113	struct sk_buff *skb = hu->tx_skb;
0372a662	114
1da177e4 LT	115	if (!skb)
	116	skb = hu->proto->dequeue(hu);
	117	else
	118	hu->tx_skb = NULL;
0372a662	119
1da177e4 LT	120	return skb;
	121	}
	122
	123	int hci_uart_tx_wakeup(struct hci_uart *hu)
	124	{
1da177e4 LT	125	if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
	126	set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
	127	return 0;
	128	}
	129
	130	BT_DBG("");
	131
da64c27d FB	132	schedule_work(&hu->write_work);
	133
	134	return 0;
	135	}
	136
	137	static void hci_uart_write_work(struct work_struct *work)
	138	{
	139	struct hci_uart *hu = container_of(work, struct hci_uart, write_work);
	140	struct tty_struct *tty = hu->tty;
	141	struct hci_dev *hdev = hu->hdev;
	142	struct sk_buff *skb;
	143
	144	/* REVISIT: should we cope with bad skbs or ->write() returning
	145	* and error value ?
	146	*/
	147
1da177e4 LT	148	restart:
	149	clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
	150
	151	while ((skb = hci_uart_dequeue(hu))) {
	152	int len;
0372a662	153
1da177e4	154	set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
f34d7a5b	155	len = tty->ops->write(tty, skb->data, skb->len);
1da177e4 LT	156	hdev->stat.byte_tx += len;
	157
	158	skb_pull(skb, len);
	159	if (skb->len) {
	160	hu->tx_skb = skb;
	161	break;
	162	}
0372a662	163
0d48d939	164	hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
1da177e4	165	kfree_skb(skb);
0372a662 MH	166	}
0372a662 MH	167
1da177e4 LT	168	if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
	169	goto restart;
	170
	171	clear_bit(HCI_UART_SENDING, &hu->tx_state);
1da177e4 LT	172	}
1da177e4 LT	173
9f2aee84 JH	174	static void hci_uart_init_work(struct work_struct *work)
	175	{
	176	struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
	177	int err;
	178
	179	if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
	180	return;
	181
	182	err = hci_register_dev(hu->hdev);
	183	if (err < 0) {
	184	BT_ERR("Can't register HCI device");
	185	hci_free_dev(hu->hdev);
	186	hu->hdev = NULL;
	187	hu->proto->close(hu);
	188	}
	189
	190	set_bit(HCI_UART_REGISTERED, &hu->flags);
	191	}
	192
	193	int hci_uart_init_ready(struct hci_uart *hu)
	194	{
	195	if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
	196	return -EALREADY;
	197
	198	schedule_work(&hu->init_ready);
	199
	200	return 0;
	201	}
	202
1da177e4 LT	203	/* ------- Interface to HCI layer ------ */
	204	/* Initialize device */
	205	static int hci_uart_open(struct hci_dev *hdev)
	206	{
	207	BT_DBG("%s %p", hdev->name, hdev);
	208
	209	/* Nothing to do for UART driver */
	210
	211	set_bit(HCI_RUNNING, &hdev->flags);
0372a662	212
1da177e4 LT	213	return 0;
	214	}
	215
	216	/* Reset device */
	217	static int hci_uart_flush(struct hci_dev *hdev)
	218	{
155961e8	219	struct hci_uart *hu = hci_get_drvdata(hdev);
1da177e4 LT	220	struct tty_struct *tty = hu->tty;
	221
	222	BT_DBG("hdev %p tty %p", hdev, tty);
	223
	224	if (hu->tx_skb) {
	225	kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
	226	}
	227
	228	/* Flush any pending characters in the driver and discipline. */
	229	tty_ldisc_flush(tty);
f34d7a5b	230	tty_driver_flush_buffer(tty);
1da177e4 LT	231
	232	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	233	hu->proto->flush(hu);
	234
	235	return 0;
	236	}
	237
	238	/* Close device */
	239	static int hci_uart_close(struct hci_dev *hdev)
	240	{
	241	BT_DBG("hdev %p", hdev);
	242
	243	if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
	244	return 0;
	245
	246	hci_uart_flush(hdev);
3611f4d2	247	hdev->flush = NULL;
1da177e4 LT	248	return 0;
	249	}
	250
	251	/* Send frames from HCI layer */
7bd8f09f	252	static int hci_uart_send_frame(struct hci_dev hdev, struct sk_buff skb)
1da177e4	253	{
52bc423a	254	struct hci_uart *hu = hci_get_drvdata(hdev);
1da177e4 LT	255
	256	if (!test_bit(HCI_RUNNING, &hdev->flags))
	257	return -EBUSY;
	258
0d48d939	259	BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
1da177e4 LT	260
	261	hu->proto->enqueue(hu, skb);
	262
	263	hci_uart_tx_wakeup(hu);
0372a662	264
1da177e4 LT	265	return 0;
	266	}
	267
eb173809 LP	268	static int hci_uart_setup(struct hci_dev *hdev)
	269	{
	270	struct hci_uart *hu = hci_get_drvdata(hdev);
fb2ce8d1 MH	271	struct hci_rp_read_local_version *ver;
fb2ce8d1 MH	272	struct sk_buff *skb;
eb173809 LP	273
	274	if (hu->proto->setup)
	275	return hu->proto->setup(hu);
	276
fb2ce8d1 MH	277	if (!test_bit(HCI_UART_VND_DETECT, &hu->hdev_flags))
	278	return 0;
	279
	280	skb = __hci_cmd_sync(hdev, HCI_OP_READ_LOCAL_VERSION, 0, NULL,
	281	HCI_INIT_TIMEOUT);
	282	if (IS_ERR(skb)) {
	283	BT_ERR("%s: Reading local version information failed (%ld)",
	284	hdev->name, PTR_ERR(skb));
	285	return 0;
	286	}
	287
	288	if (skb->len != sizeof(*ver)) {
	289	BT_ERR("%s: Event length mismatch for version information",
	290	hdev->name);
	291	goto done;
	292	}
	293
	294	ver = (struct hci_rp_read_local_version *)skb->data;
	295
	296	switch (le16_to_cpu(ver->manufacturer)) {
16e3887f MH	297	#ifdef CONFIG_BT_HCIUART_INTEL
16e3887f MH	298	case 2:
bca03c95 MH	299	hdev->set_bdaddr = btintel_set_bdaddr;
bca03c95 MH	300	btintel_check_bdaddr(hdev);
16e3887f	301	break;
e9a2dd26 MH	302	#endif
	303	#ifdef CONFIG_BT_HCIUART_BCM
	304	case 15:
3e0ac12a MH	305	hdev->set_bdaddr = btbcm_set_bdaddr;
3e0ac12a MH	306	btbcm_check_bdaddr(hdev);
e9a2dd26	307	break;
16e3887f	308	#endif
fb2ce8d1 MH	309	}
	310
	311	done:
	312	kfree_skb(skb);
eb173809 LP	313	return 0;
	314	}
	315
1da177e4 LT	316	/* ------ LDISC part ------ */
1da177e4 LT	317	/* hci_uart_tty_open
1687dfc3	318	*
1da177e4 LT	319	* Called when line discipline changed to HCI_UART.
	320	*
	321	* Arguments:
	322	* tty pointer to tty info structure
1687dfc3	323	* Return Value:
1da177e4 LT	324	* 0 if success, otherwise error code
	325	*/
	326	static int hci_uart_tty_open(struct tty_struct *tty)
	327	{
f327b340	328	struct hci_uart *hu;
1da177e4 LT	329
	330	BT_DBG("tty %p", tty);
	331
c19483cc AC	332	/* Error if the tty has no write op instead of leaving an exploitable
	333	hole */
	334	if (tty->ops->write == NULL)
	335	return -EOPNOTSUPP;
	336
a08b15e6 VI	337	hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL);
a08b15e6 VI	338	if (!hu) {
7785162c	339	BT_ERR("Can't allocate control structure");
1da177e4 LT	340	return -ENFILE;
1da177e4 LT	341	}
0372a662	342
1da177e4 LT	343	tty->disc_data = hu;
1da177e4 LT	344	hu->tty = tty;
33f0f88f	345	tty->receive_room = 65536;
1da177e4	346
9f2aee84	347	INIT_WORK(&hu->init_ready, hci_uart_init_work);
da64c27d	348	INIT_WORK(&hu->write_work, hci_uart_write_work);
9f2aee84	349
1da177e4 LT	350	spin_lock_init(&hu->rx_lock);
	351
	352	/* Flush any pending characters in the driver and line discipline. */
0372a662	353
1da177e4 LT	354	/* FIXME: why is this needed. Note don't use ldisc_ref here as the
1da177e4 LT	355	open path is before the ldisc is referencable */
0372a662	356
c65c9bc3 AC	357	if (tty->ldisc->ops->flush_buffer)
c65c9bc3 AC	358	tty->ldisc->ops->flush_buffer(tty);
f34d7a5b	359	tty_driver_flush_buffer(tty);
1da177e4 LT	360
	361	return 0;
	362	}
	363
	364	/* hci_uart_tty_close()
	365	*
	366	* Called when the line discipline is changed to something
	367	* else, the tty is closed, or the tty detects a hangup.
	368	*/
	369	static void hci_uart_tty_close(struct tty_struct *tty)
	370	{
dfe19d28	371	struct hci_uart *hu = tty->disc_data;
dac670b9	372	struct hci_dev *hdev;
1da177e4 LT	373
	374	BT_DBG("tty %p", tty);
	375
	376	/* Detach from the tty */
	377	tty->disc_data = NULL;
	378
dac670b9 JH	379	if (!hu)
dac670b9 JH	380	return;
22ad4203	381
dac670b9 JH	382	hdev = hu->hdev;
	383	if (hdev)
	384	hci_uart_close(hdev);
1da177e4	385
da64c27d FB	386	cancel_work_sync(&hu->write_work);
da64c27d FB	387
dac670b9 JH	388	if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
dac670b9 JH	389	if (hdev) {
9f2aee84 JH	390	if (test_bit(HCI_UART_REGISTERED, &hu->flags))
9f2aee84 JH	391	hci_unregister_dev(hdev);
dac670b9	392	hci_free_dev(hdev);
1da177e4	393	}
dac670b9	394	hu->proto->close(hu);
1da177e4	395	}
dac670b9 JH	396
dac670b9 JH	397	kfree(hu);
1da177e4 LT	398	}
	399
	400	/* hci_uart_tty_wakeup()
	401	*
	402	* Callback for transmit wakeup. Called when low level
	403	* device driver can accept more send data.
	404	*
	405	* Arguments: tty pointer to associated tty instance data
	406	* Return Value: None
	407	*/
	408	static void hci_uart_tty_wakeup(struct tty_struct *tty)
	409	{
dfe19d28	410	struct hci_uart *hu = tty->disc_data;
1da177e4 LT	411
	412	BT_DBG("");
	413
	414	if (!hu)
	415	return;
	416
	417	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
	418
	419	if (tty != hu->tty)
	420	return;
	421
	422	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	423	hci_uart_tx_wakeup(hu);
	424	}
	425
1da177e4	426	/* hci_uart_tty_receive()
1687dfc3	427	*
1da177e4 LT	428	* Called by tty low level driver when receive data is
1da177e4 LT	429	* available.
1687dfc3	430	*
1da177e4 LT	431	* Arguments: tty pointer to tty isntance data
	432	* data pointer to received data
	433	* flags pointer to flags for data
	434	* count count of received data in bytes
1687dfc3	435	*
55db4c64	436	* Return Value: None
1da177e4	437	*/
facf5225 MH	438	static void hci_uart_tty_receive(struct tty_struct tty, const u8 data,
facf5225 MH	439	char *flags, int count)
1da177e4	440	{
dfe19d28	441	struct hci_uart *hu = tty->disc_data;
0372a662	442
1da177e4	443	if (!hu \|\| tty != hu->tty)
55db4c64	444	return;
1da177e4 LT	445
1da177e4 LT	446	if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
55db4c64	447	return;
0372a662	448
1da177e4	449	spin_lock(&hu->rx_lock);
9d1c40eb	450	hu->proto->recv(hu, data, count);
788f0923 CP	451
	452	if (hu->hdev)
	453	hu->hdev->stat.byte_rx += count;
	454
1da177e4 LT	455	spin_unlock(&hu->rx_lock);
1da177e4 LT	456
39c2e60f	457	tty_unthrottle(tty);
1da177e4 LT	458	}
	459
	460	static int hci_uart_register_dev(struct hci_uart *hu)
	461	{
	462	struct hci_dev *hdev;
	463
	464	BT_DBG("");
	465
	466	/* Initialize and register HCI device */
	467	hdev = hci_alloc_dev();
	468	if (!hdev) {
	469	BT_ERR("Can't allocate HCI device");
	470	return -ENOMEM;
	471	}
	472
	473	hu->hdev = hdev;
	474
c13854ce	475	hdev->bus = HCI_UART;
155961e8	476	hci_set_drvdata(hdev, hu);
1da177e4 LT	477
	478	hdev->open = hci_uart_open;
	479	hdev->close = hci_uart_close;
	480	hdev->flush = hci_uart_flush;
	481	hdev->send = hci_uart_send_frame;
eb173809	482	hdev->setup = hci_uart_setup;
6935e0f5	483	SET_HCIDEV_DEV(hdev, hu->tty->dev);
1da177e4	484
63c7d09c JH	485	if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
	486	set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
	487
6afd04ad MH	488	if (test_bit(HCI_UART_EXT_CONFIG, &hu->hdev_flags))
	489	set_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks);
	490
a55e1f38	491	if (!test_bit(HCI_UART_RESET_ON_INIT, &hu->hdev_flags))
a6c511c6	492	set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);
a55e1f38	493
8a7a3fd6 MH	494	if (test_bit(HCI_UART_CREATE_AMP, &hu->hdev_flags))
	495	hdev->dev_type = HCI_AMP;
	496	else
	497	hdev->dev_type = HCI_BREDR;
	498
9f2aee84 JH	499	if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
	500	return 0;
	501
1da177e4 LT	502	if (hci_register_dev(hdev) < 0) {
	503	BT_ERR("Can't register HCI device");
	504	hci_free_dev(hdev);
	505	return -ENODEV;
	506	}
	507
9f2aee84 JH	508	set_bit(HCI_UART_REGISTERED, &hu->flags);
9f2aee84 JH	509
1da177e4 LT	510	return 0;
	511	}
	512
	513	static int hci_uart_set_proto(struct hci_uart *hu, int id)
	514	{
4ee7ef19	515	const struct hci_uart_proto *p;
0372a662 MH	516	int err;
0372a662 MH	517
1da177e4 LT	518	p = hci_uart_get_proto(id);
	519	if (!p)
	520	return -EPROTONOSUPPORT;
	521
	522	err = p->open(hu);
	523	if (err)
	524	return err;
	525
	526	hu->proto = p;
	527
	528	err = hci_uart_register_dev(hu);
	529	if (err) {
	530	p->close(hu);
	531	return err;
	532	}
0372a662	533
1da177e4 LT	534	return 0;
	535	}
	536
bb72bd68 MH	537	static int hci_uart_set_flags(struct hci_uart *hu, unsigned long flags)
	538	{
	539	unsigned long valid_flags = BIT(HCI_UART_RAW_DEVICE) \|
	540	BIT(HCI_UART_RESET_ON_INIT) \|
	541	BIT(HCI_UART_CREATE_AMP) \|
6afd04ad	542	BIT(HCI_UART_INIT_PENDING) \|
fb2ce8d1 MH	543	BIT(HCI_UART_EXT_CONFIG) \|
fb2ce8d1 MH	544	BIT(HCI_UART_VND_DETECT);
bb72bd68	545
41533fe5	546	if (flags & ~valid_flags)
bb72bd68 MH	547	return -EINVAL;
	548
	549	hu->hdev_flags = flags;
	550
	551	return 0;
	552	}
	553
1da177e4 LT	554	/* hci_uart_tty_ioctl()
	555	*
	556	* Process IOCTL system call for the tty device.
	557	*
	558	* Arguments:
	559	*
	560	* tty pointer to tty instance data
	561	* file pointer to open file object for device
	562	* cmd IOCTL command code
	563	* arg argument for IOCTL call (cmd dependent)
	564	*
	565	* Return Value: Command dependent
	566	*/
facf5225 MH	567	static int hci_uart_tty_ioctl(struct tty_struct tty, struct file file,
facf5225 MH	568	unsigned int cmd, unsigned long arg)
1da177e4	569	{
dfe19d28	570	struct hci_uart *hu = tty->disc_data;
1da177e4 LT	571	int err = 0;
	572
	573	BT_DBG("");
	574
	575	/* Verify the status of the device */
	576	if (!hu)
	577	return -EBADF;
	578
	579	switch (cmd) {
	580	case HCIUARTSETPROTO:
	581	if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
	582	err = hci_uart_set_proto(hu, arg);
	583	if (err) {
	584	clear_bit(HCI_UART_PROTO_SET, &hu->flags);
	585	return err;
	586	}
0372a662	587	} else
1da177e4	588	return -EBUSY;
c33be3c3	589	break;
1da177e4 LT	590
	591	case HCIUARTGETPROTO:
	592	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	593	return hu->proto->id;
	594	return -EUNATCH;
0372a662	595
d2158744	596	case HCIUARTGETDEVICE:
c7e0c141	597	if (test_bit(HCI_UART_REGISTERED, &hu->flags))
d2158744 MH	598	return hu->hdev->id;
	599	return -EUNATCH;
	600
63c7d09c JH	601	case HCIUARTSETFLAGS:
	602	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	603	return -EBUSY;
bb72bd68 MH	604	err = hci_uart_set_flags(hu, arg);
	605	if (err)
	606	return err;
63c7d09c JH	607	break;
	608
	609	case HCIUARTGETFLAGS:
	610	return hu->hdev_flags;
	611
1da177e4	612	default:
47afa7a5	613	err = n_tty_ioctl_helper(tty, file, cmd, arg);
1da177e4	614	break;
a20890d0	615	}
1da177e4 LT	616
	617	return err;
	618	}
	619
	620	/*
	621	* We don't provide read/write/poll interface for user space.
	622	*/
0372a662	623	static ssize_t hci_uart_tty_read(struct tty_struct tty, struct file file,
facf5225	624	unsigned char __user *buf, size_t nr)
1da177e4 LT	625	{
	626	return 0;
	627	}
0372a662 MH	628
0372a662 MH	629	static ssize_t hci_uart_tty_write(struct tty_struct tty, struct file file,
facf5225	630	const unsigned char *data, size_t count)
1da177e4 LT	631	{
	632	return 0;
	633	}
0372a662 MH	634
0372a662 MH	635	static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
facf5225	636	struct file filp, poll_table wait)
1da177e4 LT	637	{
	638	return 0;
	639	}
	640
1da177e4 LT	641	static int __init hci_uart_init(void)
1da177e4 LT	642	{
a352def2	643	static struct tty_ldisc_ops hci_uart_ldisc;
1da177e4 LT	644	int err;
	645
	646	BT_INFO("HCI UART driver ver %s", VERSION);
	647
	648	/* Register the tty discipline */
	649
	650	memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
0372a662 MH	651	hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
	652	hci_uart_ldisc.name = "n_hci";
	653	hci_uart_ldisc.open = hci_uart_tty_open;
	654	hci_uart_ldisc.close = hci_uart_tty_close;
	655	hci_uart_ldisc.read = hci_uart_tty_read;
	656	hci_uart_ldisc.write = hci_uart_tty_write;
	657	hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
	658	hci_uart_ldisc.poll = hci_uart_tty_poll;
0372a662 MH	659	hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
	660	hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
	661	hci_uart_ldisc.owner = THIS_MODULE;
1da177e4	662
a08b15e6 VI	663	err = tty_register_ldisc(N_HCI, &hci_uart_ldisc);
a08b15e6 VI	664	if (err) {
1da177e4 LT	665	BT_ERR("HCI line discipline registration failed. (%d)", err);
	666	return err;
	667	}
	668
	669	#ifdef CONFIG_BT_HCIUART_H4
	670	h4_init();
	671	#endif
	672	#ifdef CONFIG_BT_HCIUART_BCSP
	673	bcsp_init();
	674	#endif
166d2f6a OBC	675	#ifdef CONFIG_BT_HCIUART_LL
	676	ll_init();
	677	#endif
b3190df6 SS	678	#ifdef CONFIG_BT_HCIUART_ATH3K
	679	ath_init();
	680	#endif
7dec65c8 JH	681	#ifdef CONFIG_BT_HCIUART_3WIRE
	682	h5_init();
	683	#endif
bdd8818e MH	684	#ifdef CONFIG_BT_HCIUART_BCM
	685	bcm_init();
	686	#endif
166d2f6a	687
1da177e4 LT	688	return 0;
	689	}
	690
	691	static void __exit hci_uart_exit(void)
	692	{
	693	int err;
	694
	695	#ifdef CONFIG_BT_HCIUART_H4
	696	h4_deinit();
	697	#endif
	698	#ifdef CONFIG_BT_HCIUART_BCSP
	699	bcsp_deinit();
	700	#endif
166d2f6a OBC	701	#ifdef CONFIG_BT_HCIUART_LL
	702	ll_deinit();
	703	#endif
b3190df6 SS	704	#ifdef CONFIG_BT_HCIUART_ATH3K
	705	ath_deinit();
	706	#endif
7dec65c8 JH	707	#ifdef CONFIG_BT_HCIUART_3WIRE
	708	h5_deinit();
	709	#endif
bdd8818e MH	710	#ifdef CONFIG_BT_HCIUART_BCM
	711	bcm_deinit();
	712	#endif
1da177e4 LT	713
1da177e4 LT	714	/* Release tty registration of line discipline */
a08b15e6 VI	715	err = tty_unregister_ldisc(N_HCI);
a08b15e6 VI	716	if (err)
1da177e4 LT	717	BT_ERR("Can't unregister HCI line discipline (%d)", err);
	718	}
	719
	720	module_init(hci_uart_init);
	721	module_exit(hci_uart_exit);
	722
63fbd24e	723	MODULE_AUTHOR("Marcel Holtmann <[email protected]>");
1da177e4 LT	724	MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
	725	MODULE_VERSION(VERSION);
	726	MODULE_LICENSE("GPL");
	727	MODULE_ALIAS_LDISC(N_HCI);