[GitHub/mt8127/android_kernel_alcatel_ttab.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 "2.2"

static int reset = 0;

static struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];

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

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

	hup[p->id] = p;

	return 0;
}

int hci_uart_unregister_proto(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 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)
{
	struct tty_struct *tty = hu->tty;
	struct hci_dev *hdev = hu->hdev;
	struct sk_buff *skb;

	if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
		set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
		return 0;
	}

	BT_DBG("");

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);
	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  = (struct hci_uart *) hdev->driver_data;
	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 sk_buff *skb)
{
	struct hci_dev* hdev = (struct hci_dev *) skb->dev;
	struct hci_uart *hu;

	if (!hdev) {
		BT_ERR("Frame for unknown device (hdev=NULL)");
		return -ENODEV;
	}

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

	hu = (struct hci_uart *) hdev->driver_data;

	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 void hci_uart_destruct(struct hci_dev *hdev)
{
	if (!hdev)
		return;

	BT_DBG("%s", hdev->name);
	kfree(hdev->driver_data);
}

/* ------ 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 = (void *) tty->disc_data;

	BT_DBG("tty %p", tty);

	/* FIXME: This btw is bogus, nothing requires the old ldisc to clear
	   the pointer */
	if (hu)
		return -EEXIST;

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

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

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

	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 = (void *)tty->disc_data;

	BT_DBG("tty %p", tty);

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

	if (hu) {
		struct hci_dev *hdev = hu->hdev;

		if (hdev)
			hci_uart_close(hdev);

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

/* 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 = (void *)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 = (void *)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, (void *) data, count);
	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;
	hdev->driver_data = hu;

	hdev->open  = hci_uart_open;
	hdev->close = hci_uart_close;
	hdev->flush = hci_uart_flush;
	hdev->send  = hci_uart_send_frame;
	hdev->destruct = hci_uart_destruct;

	hdev->owner = THIS_MODULE;

	if (!reset)
		set_bit(HCI_QUIRK_NO_RESET, &hdev->quirks);

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

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

	return 0;
}

static int hci_uart_set_proto(struct hci_uart *hu, int id)
{
	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;
}

/* 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 = (void *)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_PROTO_SET, &hu->flags))
			return hu->hdev->id;
		return -EUNATCH;

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

	if ((err = tty_register_ldisc(N_HCI, &hci_uart_ldisc))) {
		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

	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

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

module_init(hci_uart_init);
module_exit(hci_uart_exit);

module_param(reset, bool, 0644);
MODULE_PARM_DESC(reset, "Send HCI reset command on initialization");

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
0372a662 MH	49	#define VERSION "2.2"
0372a662 MH	50
1da177e4 LT	51	static int reset = 0;
	52
	53	static struct hci_uart_proto *hup[HCI_UART_MAX_PROTO];
	54
	55	int hci_uart_register_proto(struct hci_uart_proto *p)
	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
1da177e4 LT	65	return 0;
	66	}
	67
	68	int hci_uart_unregister_proto(struct hci_uart_proto *p)
	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
	81	static struct hci_uart_proto *hci_uart_get_proto(unsigned int id)
	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	{
	123	struct tty_struct *tty = hu->tty;
	124	struct hci_dev *hdev = hu->hdev;
	125	struct sk_buff *skb;
0372a662	126
1da177e4 LT	127	if (test_and_set_bit(HCI_UART_SENDING, &hu->tx_state)) {
	128	set_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
	129	return 0;
	130	}
	131
	132	BT_DBG("");
	133
	134	restart:
	135	clear_bit(HCI_UART_TX_WAKEUP, &hu->tx_state);
	136
	137	while ((skb = hci_uart_dequeue(hu))) {
	138	int len;
0372a662	139
1da177e4	140	set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
f34d7a5b	141	len = tty->ops->write(tty, skb->data, skb->len);
1da177e4 LT	142	hdev->stat.byte_tx += len;
	143
	144	skb_pull(skb, len);
	145	if (skb->len) {
	146	hu->tx_skb = skb;
	147	break;
	148	}
0372a662	149
0d48d939	150	hci_uart_tx_complete(hu, bt_cb(skb)->pkt_type);
1da177e4	151	kfree_skb(skb);
0372a662 MH	152	}
0372a662 MH	153
1da177e4 LT	154	if (test_bit(HCI_UART_TX_WAKEUP, &hu->tx_state))
	155	goto restart;
	156
	157	clear_bit(HCI_UART_SENDING, &hu->tx_state);
	158	return 0;
	159	}
	160
	161	/* ------- Interface to HCI layer ------ */
	162	/* Initialize device */
	163	static int hci_uart_open(struct hci_dev *hdev)
	164	{
	165	BT_DBG("%s %p", hdev->name, hdev);
	166
	167	/* Nothing to do for UART driver */
	168
	169	set_bit(HCI_RUNNING, &hdev->flags);
0372a662	170
1da177e4 LT	171	return 0;
	172	}
	173
	174	/* Reset device */
	175	static int hci_uart_flush(struct hci_dev *hdev)
	176	{
	177	struct hci_uart hu = (struct hci_uart ) hdev->driver_data;
	178	struct tty_struct *tty = hu->tty;
	179
	180	BT_DBG("hdev %p tty %p", hdev, tty);
	181
	182	if (hu->tx_skb) {
	183	kfree_skb(hu->tx_skb); hu->tx_skb = NULL;
	184	}
	185
	186	/* Flush any pending characters in the driver and discipline. */
	187	tty_ldisc_flush(tty);
f34d7a5b	188	tty_driver_flush_buffer(tty);
1da177e4 LT	189
	190	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	191	hu->proto->flush(hu);
	192
	193	return 0;
	194	}
	195
	196	/* Close device */
	197	static int hci_uart_close(struct hci_dev *hdev)
	198	{
	199	BT_DBG("hdev %p", hdev);
	200
	201	if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
	202	return 0;
	203
	204	hci_uart_flush(hdev);
3611f4d2	205	hdev->flush = NULL;
1da177e4 LT	206	return 0;
	207	}
	208
	209	/* Send frames from HCI layer */
	210	static int hci_uart_send_frame(struct sk_buff *skb)
	211	{
	212	struct hci_dev* hdev = (struct hci_dev *) skb->dev;
1da177e4 LT	213	struct hci_uart *hu;
	214
	215	if (!hdev) {
af901ca1	216	BT_ERR("Frame for unknown device (hdev=NULL)");
1da177e4 LT	217	return -ENODEV;
	218	}
	219
	220	if (!test_bit(HCI_RUNNING, &hdev->flags))
	221	return -EBUSY;
	222
	223	hu = (struct hci_uart *) hdev->driver_data;
1da177e4	224
0d48d939	225	BT_DBG("%s: type %d len %d", hdev->name, bt_cb(skb)->pkt_type, skb->len);
1da177e4 LT	226
	227	hu->proto->enqueue(hu, skb);
	228
	229	hci_uart_tx_wakeup(hu);
0372a662	230
1da177e4 LT	231	return 0;
	232	}
	233
	234	static void hci_uart_destruct(struct hci_dev *hdev)
	235	{
0372a662 MH	236	if (!hdev)
0372a662 MH	237	return;
1da177e4 LT	238
1da177e4 LT	239	BT_DBG("%s", hdev->name);
7785162c	240	kfree(hdev->driver_data);
1da177e4 LT	241	}
	242
	243	/* ------ LDISC part ------ */
	244	/* hci_uart_tty_open
	245	*
	246	* Called when line discipline changed to HCI_UART.
	247	*
	248	* Arguments:
	249	* tty pointer to tty info structure
	250	* Return Value:
	251	* 0 if success, otherwise error code
	252	*/
	253	static int hci_uart_tty_open(struct tty_struct *tty)
	254	{
	255	struct hci_uart hu = (void ) tty->disc_data;
	256
	257	BT_DBG("tty %p", tty);
	258
c19483cc AC	259	/* FIXME: This btw is bogus, nothing requires the old ldisc to clear
c19483cc AC	260	the pointer */
1da177e4 LT	261	if (hu)
	262	return -EEXIST;
	263
c19483cc AC	264	/* Error if the tty has no write op instead of leaving an exploitable
	265	hole */
	266	if (tty->ops->write == NULL)
	267	return -EOPNOTSUPP;
	268
089b1dbb	269	if (!(hu = kzalloc(sizeof(struct hci_uart), GFP_KERNEL))) {
7785162c	270	BT_ERR("Can't allocate control structure");
1da177e4 LT	271	return -ENFILE;
1da177e4 LT	272	}
0372a662	273
1da177e4 LT	274	tty->disc_data = hu;
1da177e4 LT	275	hu->tty = tty;
33f0f88f	276	tty->receive_room = 65536;
1da177e4 LT	277
	278	spin_lock_init(&hu->rx_lock);
	279
	280	/* Flush any pending characters in the driver and line discipline. */
0372a662	281
1da177e4 LT	282	/* FIXME: why is this needed. Note don't use ldisc_ref here as the
1da177e4 LT	283	open path is before the ldisc is referencable */
0372a662	284
c65c9bc3 AC	285	if (tty->ldisc->ops->flush_buffer)
c65c9bc3 AC	286	tty->ldisc->ops->flush_buffer(tty);
f34d7a5b	287	tty_driver_flush_buffer(tty);
1da177e4 LT	288
	289	return 0;
	290	}
	291
	292	/* hci_uart_tty_close()
	293	*
	294	* Called when the line discipline is changed to something
	295	* else, the tty is closed, or the tty detects a hangup.
	296	*/
	297	static void hci_uart_tty_close(struct tty_struct *tty)
	298	{
	299	struct hci_uart hu = (void )tty->disc_data;
	300
	301	BT_DBG("tty %p", tty);
	302
	303	/* Detach from the tty */
	304	tty->disc_data = NULL;
	305
	306	if (hu) {
	307	struct hci_dev *hdev = hu->hdev;
22ad4203 MH	308
	309	if (hdev)
	310	hci_uart_close(hdev);
1da177e4 LT	311
	312	if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
	313	hu->proto->close(hu);
d9319560 JN	314	if (hdev) {
	315	hci_unregister_dev(hdev);
	316	hci_free_dev(hdev);
	317	}
1da177e4 LT	318	}
	319	}
	320	}
	321
	322	/* hci_uart_tty_wakeup()
	323	*
	324	* Callback for transmit wakeup. Called when low level
	325	* device driver can accept more send data.
	326	*
	327	* Arguments: tty pointer to associated tty instance data
	328	* Return Value: None
	329	*/
	330	static void hci_uart_tty_wakeup(struct tty_struct *tty)
	331	{
	332	struct hci_uart hu = (void )tty->disc_data;
	333
	334	BT_DBG("");
	335
	336	if (!hu)
	337	return;
	338
	339	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
	340
	341	if (tty != hu->tty)
	342	return;
	343
	344	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	345	hci_uart_tx_wakeup(hu);
	346	}
	347
1da177e4 LT	348	/* hci_uart_tty_receive()
	349	*
	350	* Called by tty low level driver when receive data is
	351	* available.
	352	*
	353	* Arguments: tty pointer to tty isntance data
	354	* data pointer to received data
	355	* flags pointer to flags for data
	356	* count count of received data in bytes
	357	*
	358	* Return Value: None
	359	*/
7785162c	360	static void hci_uart_tty_receive(struct tty_struct tty, const u8 data, char *flags, int count)
1da177e4 LT	361	{
1da177e4 LT	362	struct hci_uart hu = (void )tty->disc_data;
0372a662	363
1da177e4 LT	364	if (!hu \|\| tty != hu->tty)
	365	return;
	366
	367	if (!test_bit(HCI_UART_PROTO_SET, &hu->flags))
	368	return;
0372a662	369
1da177e4 LT	370	spin_lock(&hu->rx_lock);
	371	hu->proto->recv(hu, (void *) data, count);
	372	hu->hdev->stat.byte_rx += count;
	373	spin_unlock(&hu->rx_lock);
	374
39c2e60f	375	tty_unthrottle(tty);
1da177e4 LT	376	}
	377
	378	static int hci_uart_register_dev(struct hci_uart *hu)
	379	{
	380	struct hci_dev *hdev;
	381
	382	BT_DBG("");
	383
	384	/* Initialize and register HCI device */
	385	hdev = hci_alloc_dev();
	386	if (!hdev) {
	387	BT_ERR("Can't allocate HCI device");
	388	return -ENOMEM;
	389	}
	390
	391	hu->hdev = hdev;
	392
c13854ce	393	hdev->bus = HCI_UART;
1da177e4 LT	394	hdev->driver_data = hu;
	395
	396	hdev->open = hci_uart_open;
	397	hdev->close = hci_uart_close;
	398	hdev->flush = hci_uart_flush;
	399	hdev->send = hci_uart_send_frame;
	400	hdev->destruct = hci_uart_destruct;
	401
	402	hdev->owner = THIS_MODULE;
	403
7a9d4020 MH	404	if (!reset)
7a9d4020 MH	405	set_bit(HCI_QUIRK_NO_RESET, &hdev->quirks);
1da177e4	406
63c7d09c JH	407	if (test_bit(HCI_UART_RAW_DEVICE, &hu->hdev_flags))
	408	set_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks);
	409
1da177e4 LT	410	if (hci_register_dev(hdev) < 0) {
	411	BT_ERR("Can't register HCI device");
	412	hci_free_dev(hdev);
	413	return -ENODEV;
	414	}
	415
	416	return 0;
	417	}
	418
	419	static int hci_uart_set_proto(struct hci_uart *hu, int id)
	420	{
	421	struct hci_uart_proto *p;
0372a662 MH	422	int err;
0372a662 MH	423
1da177e4 LT	424	p = hci_uart_get_proto(id);
	425	if (!p)
	426	return -EPROTONOSUPPORT;
	427
	428	err = p->open(hu);
	429	if (err)
	430	return err;
	431
	432	hu->proto = p;
	433
	434	err = hci_uart_register_dev(hu);
	435	if (err) {
	436	p->close(hu);
	437	return err;
	438	}
0372a662	439
1da177e4 LT	440	return 0;
	441	}
	442
	443	/* hci_uart_tty_ioctl()
	444	*
	445	* Process IOCTL system call for the tty device.
	446	*
	447	* Arguments:
	448	*
	449	* tty pointer to tty instance data
	450	* file pointer to open file object for device
	451	* cmd IOCTL command code
	452	* arg argument for IOCTL call (cmd dependent)
	453	*
	454	* Return Value: Command dependent
	455	*/
	456	static int hci_uart_tty_ioctl(struct tty_struct tty, struct file file,
0372a662	457	unsigned int cmd, unsigned long arg)
1da177e4 LT	458	{
	459	struct hci_uart hu = (void )tty->disc_data;
	460	int err = 0;
	461
	462	BT_DBG("");
	463
	464	/* Verify the status of the device */
	465	if (!hu)
	466	return -EBADF;
	467
	468	switch (cmd) {
	469	case HCIUARTSETPROTO:
	470	if (!test_and_set_bit(HCI_UART_PROTO_SET, &hu->flags)) {
	471	err = hci_uart_set_proto(hu, arg);
	472	if (err) {
	473	clear_bit(HCI_UART_PROTO_SET, &hu->flags);
	474	return err;
	475	}
0372a662	476	} else
1da177e4	477	return -EBUSY;
c33be3c3	478	break;
1da177e4 LT	479
	480	case HCIUARTGETPROTO:
	481	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	482	return hu->proto->id;
	483	return -EUNATCH;
0372a662	484
d2158744 MH	485	case HCIUARTGETDEVICE:
	486	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	487	return hu->hdev->id;
	488	return -EUNATCH;
	489
63c7d09c JH	490	case HCIUARTSETFLAGS:
	491	if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
	492	return -EBUSY;
	493	hu->hdev_flags = arg;
	494	break;
	495
	496	case HCIUARTGETFLAGS:
	497	return hu->hdev_flags;
	498
1da177e4	499	default:
47afa7a5	500	err = n_tty_ioctl_helper(tty, file, cmd, arg);
1da177e4 LT	501	break;
	502	};
	503
	504	return err;
	505	}
	506
	507	/*
	508	* We don't provide read/write/poll interface for user space.
	509	*/
0372a662 MH	510	static ssize_t hci_uart_tty_read(struct tty_struct tty, struct file file,
0372a662 MH	511	unsigned char __user *buf, size_t nr)
1da177e4 LT	512	{
	513	return 0;
	514	}
0372a662 MH	515
	516	static ssize_t hci_uart_tty_write(struct tty_struct tty, struct file file,
	517	const unsigned char *data, size_t count)
1da177e4 LT	518	{
	519	return 0;
	520	}
0372a662 MH	521
	522	static unsigned int hci_uart_tty_poll(struct tty_struct *tty,
	523	struct file filp, poll_table wait)
1da177e4 LT	524	{
	525	return 0;
	526	}
	527
1da177e4 LT	528	static int __init hci_uart_init(void)
1da177e4 LT	529	{
a352def2	530	static struct tty_ldisc_ops hci_uart_ldisc;
1da177e4 LT	531	int err;
	532
	533	BT_INFO("HCI UART driver ver %s", VERSION);
	534
	535	/* Register the tty discipline */
	536
	537	memset(&hci_uart_ldisc, 0, sizeof (hci_uart_ldisc));
0372a662 MH	538	hci_uart_ldisc.magic = TTY_LDISC_MAGIC;
	539	hci_uart_ldisc.name = "n_hci";
	540	hci_uart_ldisc.open = hci_uart_tty_open;
	541	hci_uart_ldisc.close = hci_uart_tty_close;
	542	hci_uart_ldisc.read = hci_uart_tty_read;
	543	hci_uart_ldisc.write = hci_uart_tty_write;
	544	hci_uart_ldisc.ioctl = hci_uart_tty_ioctl;
	545	hci_uart_ldisc.poll = hci_uart_tty_poll;
0372a662 MH	546	hci_uart_ldisc.receive_buf = hci_uart_tty_receive;
	547	hci_uart_ldisc.write_wakeup = hci_uart_tty_wakeup;
	548	hci_uart_ldisc.owner = THIS_MODULE;
1da177e4 LT	549
	550	if ((err = tty_register_ldisc(N_HCI, &hci_uart_ldisc))) {
	551	BT_ERR("HCI line discipline registration failed. (%d)", err);
	552	return err;
	553	}
	554
	555	#ifdef CONFIG_BT_HCIUART_H4
	556	h4_init();
	557	#endif
	558	#ifdef CONFIG_BT_HCIUART_BCSP
	559	bcsp_init();
	560	#endif
166d2f6a OBC	561	#ifdef CONFIG_BT_HCIUART_LL
	562	ll_init();
	563	#endif
b3190df6 SS	564	#ifdef CONFIG_BT_HCIUART_ATH3K
	565	ath_init();
	566	#endif
166d2f6a	567
1da177e4 LT	568	return 0;
	569	}
	570
	571	static void __exit hci_uart_exit(void)
	572	{
	573	int err;
	574
	575	#ifdef CONFIG_BT_HCIUART_H4
	576	h4_deinit();
	577	#endif
	578	#ifdef CONFIG_BT_HCIUART_BCSP
	579	bcsp_deinit();
	580	#endif
166d2f6a OBC	581	#ifdef CONFIG_BT_HCIUART_LL
	582	ll_deinit();
	583	#endif
b3190df6 SS	584	#ifdef CONFIG_BT_HCIUART_ATH3K
	585	ath_deinit();
	586	#endif
1da177e4 LT	587
1da177e4 LT	588	/* Release tty registration of line discipline */
64ccd715	589	if ((err = tty_unregister_ldisc(N_HCI)))
1da177e4 LT	590	BT_ERR("Can't unregister HCI line discipline (%d)", err);
	591	}
	592
	593	module_init(hci_uart_init);
	594	module_exit(hci_uart_exit);
	595
	596	module_param(reset, bool, 0644);
	597	MODULE_PARM_DESC(reset, "Send HCI reset command on initialization");
	598
63fbd24e	599	MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
1da177e4 LT	600	MODULE_DESCRIPTION("Bluetooth HCI UART driver ver " VERSION);
	601	MODULE_VERSION(VERSION);
	602	MODULE_LICENSE("GPL");
	603	MODULE_ALIAS_LDISC(N_HCI);