[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / bluetooth / hci_ll.c

/*
 *  Texas Instruments' Bluetooth HCILL UART protocol
 *
 *  HCILL (HCI Low Level) is a Texas Instruments' power management
 *  protocol extension to H4.
 *
 *  Copyright (C) 2007 Texas Instruments, Inc.
 *
 *  Written by Ohad Ben-Cohen <ohad@bencohen.org>
 *
 *  Acknowledgements:
 *  This file is based on hci_h4.c, which was written
 *  by Maxim Krasnyansky and Marcel Holtmann.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation
 *
 *  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/sched.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"

/* HCILL commands */
#define HCILL_GO_TO_SLEEP_IND	0x30
#define HCILL_GO_TO_SLEEP_ACK	0x31
#define HCILL_WAKE_UP_IND	0x32
#define HCILL_WAKE_UP_ACK	0x33

/* HCILL receiver States */
#define HCILL_W4_PACKET_TYPE	0
#define HCILL_W4_EVENT_HDR	1
#define HCILL_W4_ACL_HDR	2
#define HCILL_W4_SCO_HDR	3
#define HCILL_W4_DATA		4

/* HCILL states */
enum hcill_states_e {
	HCILL_ASLEEP,
	HCILL_ASLEEP_TO_AWAKE,
	HCILL_AWAKE,
	HCILL_AWAKE_TO_ASLEEP
};

struct hcill_cmd {
	u8 cmd;
} __packed;

struct ll_struct {
	unsigned long rx_state;
	unsigned long rx_count;
	struct sk_buff *rx_skb;
	struct sk_buff_head txq;
	spinlock_t hcill_lock;		/* HCILL state lock	*/
	unsigned long hcill_state;	/* HCILL power state	*/
	struct sk_buff_head tx_wait_q;	/* HCILL wait queue	*/
};

/*
 * Builds and sends an HCILL command packet.
 * These are very simple packets with only 1 cmd byte
 */
static int send_hcill_cmd(u8 cmd, struct hci_uart *hu)
{
	int err = 0;
	struct sk_buff *skb = NULL;
	struct ll_struct *ll = hu->priv;
	struct hcill_cmd *hcill_packet;

	BT_DBG("hu %p cmd 0x%x", hu, cmd);

	/* allocate packet */
	skb = bt_skb_alloc(1, GFP_ATOMIC);
	if (!skb) {
		BT_ERR("cannot allocate memory for HCILL packet");
		err = -ENOMEM;
		goto out;
	}

	/* prepare packet */
	hcill_packet = (struct hcill_cmd *) skb_put(skb, 1);
	hcill_packet->cmd = cmd;
	skb->dev = (void *) hu->hdev;

	/* send packet */
	skb_queue_tail(&ll->txq, skb);
out:
	return err;
}

/* Initialize protocol */
static int ll_open(struct hci_uart *hu)
{
	struct ll_struct *ll;

	BT_DBG("hu %p", hu);

	ll = kzalloc(sizeof(*ll), GFP_ATOMIC);
	if (!ll)
		return -ENOMEM;

	skb_queue_head_init(&ll->txq);
	skb_queue_head_init(&ll->tx_wait_q);
	spin_lock_init(&ll->hcill_lock);

	ll->hcill_state = HCILL_AWAKE;

	hu->priv = ll;

	return 0;
}

/* Flush protocol data */
static int ll_flush(struct hci_uart *hu)
{
	struct ll_struct *ll = hu->priv;

	BT_DBG("hu %p", hu);

	skb_queue_purge(&ll->tx_wait_q);
	skb_queue_purge(&ll->txq);

	return 0;
}

/* Close protocol */
static int ll_close(struct hci_uart *hu)
{
	struct ll_struct *ll = hu->priv;

	BT_DBG("hu %p", hu);

	skb_queue_purge(&ll->tx_wait_q);
	skb_queue_purge(&ll->txq);

	kfree_skb(ll->rx_skb);

	hu->priv = NULL;

	kfree(ll);

	return 0;
}

/*
 * internal function, which does common work of the device wake up process:
 * 1. places all pending packets (waiting in tx_wait_q list) in txq list.
 * 2. changes internal state to HCILL_AWAKE.
 * Note: assumes that hcill_lock spinlock is taken,
 * shouldn't be called otherwise!
 */
static void __ll_do_awake(struct ll_struct *ll)
{
	struct sk_buff *skb = NULL;

	while ((skb = skb_dequeue(&ll->tx_wait_q)))
		skb_queue_tail(&ll->txq, skb);

	ll->hcill_state = HCILL_AWAKE;
}

/*
 * Called upon a wake-up-indication from the device
 */
static void ll_device_want_to_wakeup(struct hci_uart *hu)
{
	unsigned long flags;
	struct ll_struct *ll = hu->priv;

	BT_DBG("hu %p", hu);

	/* lock hcill state */
	spin_lock_irqsave(&ll->hcill_lock, flags);

	switch (ll->hcill_state) {
	case HCILL_ASLEEP_TO_AWAKE:
		/*
		 * This state means that both the host and the BRF chip
		 * have simultaneously sent a wake-up-indication packet.
		 * Traditionally, in this case, receiving a wake-up-indication
		 * was enough and an additional wake-up-ack wasn't needed.
		 * This has changed with the BRF6350, which does require an
		 * explicit wake-up-ack. Other BRF versions, which do not
		 * require an explicit ack here, do accept it, thus it is
		 * perfectly safe to always send one.
		 */
		BT_DBG("dual wake-up-indication");
		/* deliberate fall-through - do not add break */
	case HCILL_ASLEEP:
		/* acknowledge device wake up */
		if (send_hcill_cmd(HCILL_WAKE_UP_ACK, hu) < 0) {
			BT_ERR("cannot acknowledge device wake up");
			goto out;
		}
		break;
	default:
		/* any other state is illegal */
		BT_ERR("received HCILL_WAKE_UP_IND in state %ld", ll->hcill_state);
		break;
	}

	/* send pending packets and change state to HCILL_AWAKE */
	__ll_do_awake(ll);

out:
	spin_unlock_irqrestore(&ll->hcill_lock, flags);

	/* actually send the packets */
	hci_uart_tx_wakeup(hu);
}

/*
 * Called upon a sleep-indication from the device
 */
static void ll_device_want_to_sleep(struct hci_uart *hu)
{
	unsigned long flags;
	struct ll_struct *ll = hu->priv;

	BT_DBG("hu %p", hu);

	/* lock hcill state */
	spin_lock_irqsave(&ll->hcill_lock, flags);

	/* sanity check */
	if (ll->hcill_state != HCILL_AWAKE)
		BT_ERR("ERR: HCILL_GO_TO_SLEEP_IND in state %ld", ll->hcill_state);

	/* acknowledge device sleep */
	if (send_hcill_cmd(HCILL_GO_TO_SLEEP_ACK, hu) < 0) {
		BT_ERR("cannot acknowledge device sleep");
		goto out;
	}

	/* update state */
	ll->hcill_state = HCILL_ASLEEP;

out:
	spin_unlock_irqrestore(&ll->hcill_lock, flags);

	/* actually send the sleep ack packet */
	hci_uart_tx_wakeup(hu);
}

/*
 * Called upon wake-up-acknowledgement from the device
 */
static void ll_device_woke_up(struct hci_uart *hu)
{
	unsigned long flags;
	struct ll_struct *ll = hu->priv;

	BT_DBG("hu %p", hu);

	/* lock hcill state */
	spin_lock_irqsave(&ll->hcill_lock, flags);

	/* sanity check */
	if (ll->hcill_state != HCILL_ASLEEP_TO_AWAKE)
		BT_ERR("received HCILL_WAKE_UP_ACK in state %ld", ll->hcill_state);

	/* send pending packets and change state to HCILL_AWAKE */
	__ll_do_awake(ll);

	spin_unlock_irqrestore(&ll->hcill_lock, flags);

	/* actually send the packets */
	hci_uart_tx_wakeup(hu);
}

/* Enqueue frame for transmittion (padding, crc, etc) */
/* may be called from two simultaneous tasklets */
static int ll_enqueue(struct hci_uart *hu, struct sk_buff *skb)
{
	unsigned long flags = 0;
	struct ll_struct *ll = hu->priv;

	BT_DBG("hu %p skb %p", hu, skb);

	/* Prepend skb with frame type */
	memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);

	/* lock hcill state */
	spin_lock_irqsave(&ll->hcill_lock, flags);

	/* act according to current state */
	switch (ll->hcill_state) {
	case HCILL_AWAKE:
		BT_DBG("device awake, sending normally");
		skb_queue_tail(&ll->txq, skb);
		break;
	case HCILL_ASLEEP:
		BT_DBG("device asleep, waking up and queueing packet");
		/* save packet for later */
		skb_queue_tail(&ll->tx_wait_q, skb);
		/* awake device */
		if (send_hcill_cmd(HCILL_WAKE_UP_IND, hu) < 0) {
			BT_ERR("cannot wake up device");
			break;
		}
		ll->hcill_state = HCILL_ASLEEP_TO_AWAKE;
		break;
	case HCILL_ASLEEP_TO_AWAKE:
		BT_DBG("device waking up, queueing packet");
		/* transient state; just keep packet for later */
		skb_queue_tail(&ll->tx_wait_q, skb);
		break;
	default:
		BT_ERR("illegal hcill state: %ld (losing packet)", ll->hcill_state);
		kfree_skb(skb);
		break;
	}

	spin_unlock_irqrestore(&ll->hcill_lock, flags);

	return 0;
}

static inline int ll_check_data_len(struct ll_struct *ll, int len)
{
	register int room = skb_tailroom(ll->rx_skb);

	BT_DBG("len %d room %d", len, room);

	if (!len) {
		hci_recv_frame(ll->rx_skb);
	} else if (len > room) {
		BT_ERR("Data length is too large");
		kfree_skb(ll->rx_skb);
	} else {
		ll->rx_state = HCILL_W4_DATA;
		ll->rx_count = len;
		return len;
	}

	ll->rx_state = HCILL_W4_PACKET_TYPE;
	ll->rx_skb   = NULL;
	ll->rx_count = 0;

	return 0;
}

/* Recv data */
static int ll_recv(struct hci_uart *hu, void *data, int count)
{
	struct ll_struct *ll = hu->priv;
	register char *ptr;
	struct hci_event_hdr *eh;
	struct hci_acl_hdr   *ah;
	struct hci_sco_hdr   *sh;
	register int len, type, dlen;

	BT_DBG("hu %p count %d rx_state %ld rx_count %ld", hu, count, ll->rx_state, ll->rx_count);

	ptr = data;
	while (count) {
		if (ll->rx_count) {
			len = min_t(unsigned int, ll->rx_count, count);
			memcpy(skb_put(ll->rx_skb, len), ptr, len);
			ll->rx_count -= len; count -= len; ptr += len;

			if (ll->rx_count)
				continue;

			switch (ll->rx_state) {
			case HCILL_W4_DATA:
				BT_DBG("Complete data");
				hci_recv_frame(ll->rx_skb);

				ll->rx_state = HCILL_W4_PACKET_TYPE;
				ll->rx_skb = NULL;
				continue;

			case HCILL_W4_EVENT_HDR:
				eh = hci_event_hdr(ll->rx_skb);

				BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen);

				ll_check_data_len(ll, eh->plen);
				continue;

			case HCILL_W4_ACL_HDR:
				ah = hci_acl_hdr(ll->rx_skb);
				dlen = __le16_to_cpu(ah->dlen);

				BT_DBG("ACL header: dlen %d", dlen);

				ll_check_data_len(ll, dlen);
				continue;

			case HCILL_W4_SCO_HDR:
				sh = hci_sco_hdr(ll->rx_skb);

				BT_DBG("SCO header: dlen %d", sh->dlen);

				ll_check_data_len(ll, sh->dlen);
				continue;
			}
		}

		/* HCILL_W4_PACKET_TYPE */
		switch (*ptr) {
		case HCI_EVENT_PKT:
			BT_DBG("Event packet");
			ll->rx_state = HCILL_W4_EVENT_HDR;
			ll->rx_count = HCI_EVENT_HDR_SIZE;
			type = HCI_EVENT_PKT;
			break;

		case HCI_ACLDATA_PKT:
			BT_DBG("ACL packet");
			ll->rx_state = HCILL_W4_ACL_HDR;
			ll->rx_count = HCI_ACL_HDR_SIZE;
			type = HCI_ACLDATA_PKT;
			break;

		case HCI_SCODATA_PKT:
			BT_DBG("SCO packet");
			ll->rx_state = HCILL_W4_SCO_HDR;
			ll->rx_count = HCI_SCO_HDR_SIZE;
			type = HCI_SCODATA_PKT;
			break;

		/* HCILL signals */
		case HCILL_GO_TO_SLEEP_IND:
			BT_DBG("HCILL_GO_TO_SLEEP_IND packet");
			ll_device_want_to_sleep(hu);
			ptr++; count--;
			continue;

		case HCILL_GO_TO_SLEEP_ACK:
			/* shouldn't happen */
			BT_ERR("received HCILL_GO_TO_SLEEP_ACK (in state %ld)", ll->hcill_state);
			ptr++; count--;
			continue;

		case HCILL_WAKE_UP_IND:
			BT_DBG("HCILL_WAKE_UP_IND packet");
			ll_device_want_to_wakeup(hu);
			ptr++; count--;
			continue;

		case HCILL_WAKE_UP_ACK:
			BT_DBG("HCILL_WAKE_UP_ACK packet");
			ll_device_woke_up(hu);
			ptr++; count--;
			continue;

		default:
			BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr);
			hu->hdev->stat.err_rx++;
			ptr++; count--;
			continue;
		};

		ptr++; count--;

		/* Allocate packet */
		ll->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
		if (!ll->rx_skb) {
			BT_ERR("Can't allocate mem for new packet");
			ll->rx_state = HCILL_W4_PACKET_TYPE;
			ll->rx_count = 0;
			return -ENOMEM;
		}

		ll->rx_skb->dev = (void *) hu->hdev;
		bt_cb(ll->rx_skb)->pkt_type = type;
	}

	return count;
}

static struct sk_buff *ll_dequeue(struct hci_uart *hu)
{
	struct ll_struct *ll = hu->priv;
	return skb_dequeue(&ll->txq);
}

static struct hci_uart_proto llp = {
	.id		= HCI_UART_LL,
	.open		= ll_open,
	.close		= ll_close,
	.recv		= ll_recv,
	.enqueue	= ll_enqueue,
	.dequeue	= ll_dequeue,
	.flush		= ll_flush,
};

int __init ll_init(void)
{
	int err = hci_uart_register_proto(&llp);

	if (!err)
		BT_INFO("HCILL protocol initialized");
	else
		BT_ERR("HCILL protocol registration failed");

	return err;
}

int __exit ll_deinit(void)
{
	return hci_uart_unregister_proto(&llp);
}
Commit	Line	Data
166d2f6a OBC	1	/*
	2	* Texas Instruments' Bluetooth HCILL UART protocol
	3	*
	4	* HCILL (HCI Low Level) is a Texas Instruments' power management
	5	* protocol extension to H4.
	6	*
	7	* Copyright (C) 2007 Texas Instruments, Inc.
	8	*
	9	* Written by Ohad Ben-Cohen <ohad@bencohen.org>
	10	*
	11	* Acknowledgements:
	12	* This file is based on hci_h4.c, which was written
	13	* by Maxim Krasnyansky and Marcel Holtmann.
	14	*
	15	* This program is free software; you can redistribute it and/or modify
	16	* it under the terms of the GNU General Public License version 2
	17	* as published by the Free Software Foundation
	18	*
	19	* This program is distributed in the hope that it will be useful,
	20	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	* GNU General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU General Public License
	25	* along with this program; if not, write to the Free Software
	26	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	27	*
	28	*/
	29
	30	#include <linux/module.h>
	31	#include <linux/kernel.h>
	32
	33	#include <linux/init.h>
	34	#include <linux/sched.h>
	35	#include <linux/types.h>
	36	#include <linux/fcntl.h>
	37	#include <linux/interrupt.h>
	38	#include <linux/ptrace.h>
	39	#include <linux/poll.h>
	40
	41	#include <linux/slab.h>
	42	#include <linux/tty.h>
	43	#include <linux/errno.h>
	44	#include <linux/string.h>
	45	#include <linux/signal.h>
	46	#include <linux/ioctl.h>
	47	#include <linux/skbuff.h>
	48
	49	#include <net/bluetooth/bluetooth.h>
	50	#include <net/bluetooth/hci_core.h>
	51
	52	#include "hci_uart.h"
	53
	54	/* HCILL commands */
	55	#define HCILL_GO_TO_SLEEP_IND 0x30
	56	#define HCILL_GO_TO_SLEEP_ACK 0x31
	57	#define HCILL_WAKE_UP_IND 0x32
	58	#define HCILL_WAKE_UP_ACK 0x33
	59
	60	/* HCILL receiver States */
	61	#define HCILL_W4_PACKET_TYPE 0
	62	#define HCILL_W4_EVENT_HDR 1
	63	#define HCILL_W4_ACL_HDR 2
	64	#define HCILL_W4_SCO_HDR 3
65	#define HCILL_W4_DATA 4
66
67	/* HCILL states */
68	enum hcill_states_e {
69	HCILL_ASLEEP,
70	HCILL_ASLEEP_TO_AWAKE,
71	HCILL_AWAKE,
72	HCILL_AWAKE_TO_ASLEEP
73	};
74
75	struct hcill_cmd {
76	u8 cmd;
81ca405a	77	} __packed;
166d2f6a OBC	78
	79	struct ll_struct {
	80	unsigned long rx_state;
	81	unsigned long rx_count;
	82	struct sk_buff *rx_skb;
	83	struct sk_buff_head txq;
	84	spinlock_t hcill_lock; /* HCILL state lock */
	85	unsigned long hcill_state; /* HCILL power state */
	86	struct sk_buff_head tx_wait_q; /* HCILL wait queue */
	87	};
	88
	89	/*
	90	* Builds and sends an HCILL command packet.
	91	* These are very simple packets with only 1 cmd byte
	92	*/
	93	static int send_hcill_cmd(u8 cmd, struct hci_uart *hu)
	94	{
	95	int err = 0;
	96	struct sk_buff *skb = NULL;
	97	struct ll_struct *ll = hu->priv;
	98	struct hcill_cmd *hcill_packet;
	99
	100	BT_DBG("hu %p cmd 0x%x", hu, cmd);
	101
	102	/* allocate packet */
	103	skb = bt_skb_alloc(1, GFP_ATOMIC);
	104	if (!skb) {
	105	BT_ERR("cannot allocate memory for HCILL packet");
	106	err = -ENOMEM;
	107	goto out;
	108	}
	109
	110	/* prepare packet */
	111	hcill_packet = (struct hcill_cmd *) skb_put(skb, 1);
	112	hcill_packet->cmd = cmd;
	113	skb->dev = (void *) hu->hdev;
	114
	115	/* send packet */
	116	skb_queue_tail(&ll->txq, skb);
	117	out:
	118	return err;
	119	}
	120
	121	/* Initialize protocol */
	122	static int ll_open(struct hci_uart *hu)
	123	{
	124	struct ll_struct *ll;
	125
	126	BT_DBG("hu %p", hu);
	127
	128	ll = kzalloc(sizeof(*ll), GFP_ATOMIC);
	129	if (!ll)
	130	return -ENOMEM;
	131
	132	skb_queue_head_init(&ll->txq);
	133	skb_queue_head_init(&ll->tx_wait_q);
	134	spin_lock_init(&ll->hcill_lock);
	135
	136	ll->hcill_state = HCILL_AWAKE;
	137
	138	hu->priv = ll;
	139
	140	return 0;
	141	}
142
143	/* Flush protocol data */
144	static int ll_flush(struct hci_uart *hu)
145	{
146	struct ll_struct *ll = hu->priv;
147
148	BT_DBG("hu %p", hu);
149
150	skb_queue_purge(&ll->tx_wait_q);
151	skb_queue_purge(&ll->txq);
152
153	return 0;
154	}
155
156	/* Close protocol */
157	static int ll_close(struct hci_uart *hu)
158	{
159	struct ll_struct *ll = hu->priv;
160
161	BT_DBG("hu %p", hu);
162
163	skb_queue_purge(&ll->tx_wait_q);
164	skb_queue_purge(&ll->txq);
165
b1fb0683	166	kfree_skb(ll->rx_skb);
166d2f6a OBC	167
	168	hu->priv = NULL;
	169
	170	kfree(ll);
	171
	172	return 0;
	173	}
	174
	175	/*
	176	* internal function, which does common work of the device wake up process:
	177	* 1. places all pending packets (waiting in tx_wait_q list) in txq list.
	178	* 2. changes internal state to HCILL_AWAKE.
	179	* Note: assumes that hcill_lock spinlock is taken,
	180	* shouldn't be called otherwise!
	181	*/
	182	static void __ll_do_awake(struct ll_struct *ll)
	183	{
	184	struct sk_buff *skb = NULL;
	185
	186	while ((skb = skb_dequeue(&ll->tx_wait_q)))
	187	skb_queue_tail(&ll->txq, skb);
	188
	189	ll->hcill_state = HCILL_AWAKE;
	190	}
	191
	192	/*
	193	* Called upon a wake-up-indication from the device
	194	*/
	195	static void ll_device_want_to_wakeup(struct hci_uart *hu)
	196	{
	197	unsigned long flags;
	198	struct ll_struct *ll = hu->priv;
	199
	200	BT_DBG("hu %p", hu);
	201
	202	/* lock hcill state */
	203	spin_lock_irqsave(&ll->hcill_lock, flags);
	204
	205	switch (ll->hcill_state) {
5c548226 OBC	206	case HCILL_ASLEEP_TO_AWAKE:
	207	/*
	208	* This state means that both the host and the BRF chip
	209	* have simultaneously sent a wake-up-indication packet.
25985edc	210	* Traditionally, in this case, receiving a wake-up-indication
5c548226 OBC	211	* was enough and an additional wake-up-ack wasn't needed.
	212	* This has changed with the BRF6350, which does require an
	213	* explicit wake-up-ack. Other BRF versions, which do not
	214	* require an explicit ack here, do accept it, thus it is
	215	* perfectly safe to always send one.
	216	*/
	217	BT_DBG("dual wake-up-indication");
	218	/* deliberate fall-through - do not add break */
166d2f6a OBC	219	case HCILL_ASLEEP:
	220	/* acknowledge device wake up */
	221	if (send_hcill_cmd(HCILL_WAKE_UP_ACK, hu) < 0) {
	222	BT_ERR("cannot acknowledge device wake up");
	223	goto out;
	224	}
	225	break;
166d2f6a	226	default:
5c548226	227	/* any other state is illegal */
166d2f6a OBC	228	BT_ERR("received HCILL_WAKE_UP_IND in state %ld", ll->hcill_state);
	229	break;
	230	}
	231
	232	/* send pending packets and change state to HCILL_AWAKE */
	233	__ll_do_awake(ll);
	234
	235	out:
	236	spin_unlock_irqrestore(&ll->hcill_lock, flags);
	237
	238	/* actually send the packets */
	239	hci_uart_tx_wakeup(hu);
	240	}
	241
	242	/*
	243	* Called upon a sleep-indication from the device
	244	*/
	245	static void ll_device_want_to_sleep(struct hci_uart *hu)
	246	{
	247	unsigned long flags;
	248	struct ll_struct *ll = hu->priv;
	249
	250	BT_DBG("hu %p", hu);
	251
	252	/* lock hcill state */
	253	spin_lock_irqsave(&ll->hcill_lock, flags);
	254
	255	/* sanity check */
	256	if (ll->hcill_state != HCILL_AWAKE)
	257	BT_ERR("ERR: HCILL_GO_TO_SLEEP_IND in state %ld", ll->hcill_state);
	258
	259	/* acknowledge device sleep */
	260	if (send_hcill_cmd(HCILL_GO_TO_SLEEP_ACK, hu) < 0) {
	261	BT_ERR("cannot acknowledge device sleep");
	262	goto out;
	263	}
	264
	265	/* update state */
	266	ll->hcill_state = HCILL_ASLEEP;
	267
	268	out:
	269	spin_unlock_irqrestore(&ll->hcill_lock, flags);
	270
	271	/* actually send the sleep ack packet */
	272	hci_uart_tx_wakeup(hu);
	273	}
	274
	275	/*
	276	* Called upon wake-up-acknowledgement from the device
	277	*/
	278	static void ll_device_woke_up(struct hci_uart *hu)
	279	{
	280	unsigned long flags;
	281	struct ll_struct *ll = hu->priv;
	282
	283	BT_DBG("hu %p", hu);
	284
	285	/* lock hcill state */
	286	spin_lock_irqsave(&ll->hcill_lock, flags);
	287
	288	/* sanity check */
	289	if (ll->hcill_state != HCILL_ASLEEP_TO_AWAKE)
	290	BT_ERR("received HCILL_WAKE_UP_ACK in state %ld", ll->hcill_state);
	291
292	/* send pending packets and change state to HCILL_AWAKE */
293	__ll_do_awake(ll);
294
295	spin_unlock_irqrestore(&ll->hcill_lock, flags);
296
297	/* actually send the packets */
298	hci_uart_tx_wakeup(hu);
299	}
300
301	/* Enqueue frame for transmittion (padding, crc, etc) */
302	/* may be called from two simultaneous tasklets */
303	static int ll_enqueue(struct hci_uart hu, struct sk_buff skb)
304	{
305	unsigned long flags = 0;
306	struct ll_struct *ll = hu->priv;
307
308	BT_DBG("hu %p skb %p", hu, skb);
309
310	/* Prepend skb with frame type */
311	memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
312
313	/* lock hcill state */
314	spin_lock_irqsave(&ll->hcill_lock, flags);
315
316	/* act according to current state */
317	switch (ll->hcill_state) {
318	case HCILL_AWAKE:
319	BT_DBG("device awake, sending normally");
320	skb_queue_tail(&ll->txq, skb);
321	break;
322	case HCILL_ASLEEP:
323	BT_DBG("device asleep, waking up and queueing packet");
324	/* save packet for later */
325	skb_queue_tail(&ll->tx_wait_q, skb);
326	/* awake device */
327	if (send_hcill_cmd(HCILL_WAKE_UP_IND, hu) < 0) {
328	BT_ERR("cannot wake up device");
329	break;
330	}
331	ll->hcill_state = HCILL_ASLEEP_TO_AWAKE;
332	break;
333	case HCILL_ASLEEP_TO_AWAKE:
334	BT_DBG("device waking up, queueing packet");
335	/* transient state; just keep packet for later */
336	skb_queue_tail(&ll->tx_wait_q, skb);
337	break;
338	default:
339	BT_ERR("illegal hcill state: %ld (losing packet)", ll->hcill_state);
340	kfree_skb(skb);
341	break;
342	}
343
344	spin_unlock_irqrestore(&ll->hcill_lock, flags);
345
346	return 0;
347	}
348
349	static inline int ll_check_data_len(struct ll_struct *ll, int len)
350	{
351	register int room = skb_tailroom(ll->rx_skb);
352
353	BT_DBG("len %d room %d", len, room);
354
355	if (!len) {
356	hci_recv_frame(ll->rx_skb);
357	} else if (len > room) {
358	BT_ERR("Data length is too large");
359	kfree_skb(ll->rx_skb);
360	} else {
361	ll->rx_state = HCILL_W4_DATA;
362	ll->rx_count = len;
363	return len;
364	}
365
366	ll->rx_state = HCILL_W4_PACKET_TYPE;
367	ll->rx_skb = NULL;
368	ll->rx_count = 0;
369
370	return 0;
371	}
372
373	/* Recv data */
374	static int ll_recv(struct hci_uart hu, void data, int count)
375	{
376	struct ll_struct *ll = hu->priv;
377	register char *ptr;
378	struct hci_event_hdr *eh;
379	struct hci_acl_hdr *ah;
380	struct hci_sco_hdr *sh;
381	register int len, type, dlen;
382
383	BT_DBG("hu %p count %d rx_state %ld rx_count %ld", hu, count, ll->rx_state, ll->rx_count);
384
385	ptr = data;
386	while (count) {
387	if (ll->rx_count) {
388	len = min_t(unsigned int, ll->rx_count, count);
389	memcpy(skb_put(ll->rx_skb, len), ptr, len);
390	ll->rx_count -= len; count -= len; ptr += len;
391
392	if (ll->rx_count)
393	continue;
394
395	switch (ll->rx_state) {
396	case HCILL_W4_DATA:
397	BT_DBG("Complete data");
398	hci_recv_frame(ll->rx_skb);
399
400	ll->rx_state = HCILL_W4_PACKET_TYPE;
401	ll->rx_skb = NULL;
402	continue;
403
404	case HCILL_W4_EVENT_HDR:
acce90d6	405	eh = hci_event_hdr(ll->rx_skb);
166d2f6a OBC	406
	407	BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen);
	408
	409	ll_check_data_len(ll, eh->plen);
	410	continue;
	411
	412	case HCILL_W4_ACL_HDR:
acce90d6	413	ah = hci_acl_hdr(ll->rx_skb);
166d2f6a OBC	414	dlen = __le16_to_cpu(ah->dlen);
	415
	416	BT_DBG("ACL header: dlen %d", dlen);
	417
	418	ll_check_data_len(ll, dlen);
	419	continue;
	420
	421	case HCILL_W4_SCO_HDR:
acce90d6	422	sh = hci_sco_hdr(ll->rx_skb);
166d2f6a OBC	423
	424	BT_DBG("SCO header: dlen %d", sh->dlen);
	425
	426	ll_check_data_len(ll, sh->dlen);
	427	continue;
	428	}
	429	}
	430
	431	/* HCILL_W4_PACKET_TYPE */
	432	switch (*ptr) {
	433	case HCI_EVENT_PKT:
	434	BT_DBG("Event packet");
	435	ll->rx_state = HCILL_W4_EVENT_HDR;
	436	ll->rx_count = HCI_EVENT_HDR_SIZE;
	437	type = HCI_EVENT_PKT;
	438	break;
	439
	440	case HCI_ACLDATA_PKT:
	441	BT_DBG("ACL packet");
	442	ll->rx_state = HCILL_W4_ACL_HDR;
	443	ll->rx_count = HCI_ACL_HDR_SIZE;
	444	type = HCI_ACLDATA_PKT;
	445	break;
	446
	447	case HCI_SCODATA_PKT:
	448	BT_DBG("SCO packet");
	449	ll->rx_state = HCILL_W4_SCO_HDR;
	450	ll->rx_count = HCI_SCO_HDR_SIZE;
	451	type = HCI_SCODATA_PKT;
	452	break;
	453
	454	/* HCILL signals */
	455	case HCILL_GO_TO_SLEEP_IND:
	456	BT_DBG("HCILL_GO_TO_SLEEP_IND packet");
	457	ll_device_want_to_sleep(hu);
	458	ptr++; count--;
	459	continue;
	460
	461	case HCILL_GO_TO_SLEEP_ACK:
	462	/* shouldn't happen */
	463	BT_ERR("received HCILL_GO_TO_SLEEP_ACK (in state %ld)", ll->hcill_state);
	464	ptr++; count--;
	465	continue;
	466
	467	case HCILL_WAKE_UP_IND:
	468	BT_DBG("HCILL_WAKE_UP_IND packet");
	469	ll_device_want_to_wakeup(hu);
	470	ptr++; count--;
	471	continue;
	472
	473	case HCILL_WAKE_UP_ACK:
	474	BT_DBG("HCILL_WAKE_UP_ACK packet");
	475	ll_device_woke_up(hu);
	476	ptr++; count--;
	477	continue;
	478
	479	default:
	480	BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr);
	481	hu->hdev->stat.err_rx++;
	482	ptr++; count--;
	483	continue;
	484	};
	485
	486	ptr++; count--;
487
488	/* Allocate packet */
489	ll->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
490	if (!ll->rx_skb) {
491	BT_ERR("Can't allocate mem for new packet");
492	ll->rx_state = HCILL_W4_PACKET_TYPE;
493	ll->rx_count = 0;
fe1aff71	494	return -ENOMEM;
166d2f6a OBC	495	}
	496
	497	ll->rx_skb->dev = (void *) hu->hdev;
	498	bt_cb(ll->rx_skb)->pkt_type = type;
	499	}
	500
	501	return count;
	502	}
	503
	504	static struct sk_buff ll_dequeue(struct hci_uart hu)
	505	{
	506	struct ll_struct *ll = hu->priv;
	507	return skb_dequeue(&ll->txq);
	508	}
	509
	510	static struct hci_uart_proto llp = {
	511	.id = HCI_UART_LL,
	512	.open = ll_open,
	513	.close = ll_close,
	514	.recv = ll_recv,
	515	.enqueue = ll_enqueue,
	516	.dequeue = ll_dequeue,
	517	.flush = ll_flush,
	518	};
	519
f2b94bb9	520	int __init ll_init(void)
166d2f6a OBC	521	{
	522	int err = hci_uart_register_proto(&llp);
	523
	524	if (!err)
	525	BT_INFO("HCILL protocol initialized");
	526	else
	527	BT_ERR("HCILL protocol registration failed");
	528
	529	return err;
	530	}
	531
f2b94bb9	532	int __exit ll_deinit(void)
166d2f6a OBC	533	{
	534	return hci_uart_unregister_proto(&llp);
	535	}