[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;
} __attribute__((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);

	if (ll->rx_skb)
		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:
		/* acknowledge device wake up */
		if (send_hcill_cmd(HCILL_WAKE_UP_ACK, hu) < 0) {
			BT_ERR("cannot acknowledge device wake up");
			goto out;
		}
		break;
	case HCILL_ASLEEP_TO_AWAKE:
		/*
		 * this state means that a wake-up-indication
		 * is already on its way to the device,
		 * and will serve as the required wake-up-ack
		 */
		BT_DBG("dual wake-up-indication");
		break;
	default:
		/* any other state are 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 = (struct hci_event_hdr *) ll->rx_skb->data;

				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 = (struct hci_acl_hdr *) ll->rx_skb->data;
				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 = (struct hci_sco_hdr *) ll->rx_skb->data;

				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 0;
		}

		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 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 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;
77	} __attribute__((packed));
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
166	if (ll->rx_skb)
167	kfree_skb(ll->rx_skb);
168
169	hu->priv = NULL;
170
171	kfree(ll);
172
173	return 0;
174	}
175
176	/*
177	* internal function, which does common work of the device wake up process:
178	* 1. places all pending packets (waiting in tx_wait_q list) in txq list.
179	* 2. changes internal state to HCILL_AWAKE.
180	* Note: assumes that hcill_lock spinlock is taken,
181	* shouldn't be called otherwise!
182	*/
183	static void __ll_do_awake(struct ll_struct *ll)
184	{
185	struct sk_buff *skb = NULL;
186
187	while ((skb = skb_dequeue(&ll->tx_wait_q)))
188	skb_queue_tail(&ll->txq, skb);
189
190	ll->hcill_state = HCILL_AWAKE;
191	}
192
193	/*
194	* Called upon a wake-up-indication from the device
195	*/
196	static void ll_device_want_to_wakeup(struct hci_uart *hu)
197	{
198	unsigned long flags;
199	struct ll_struct *ll = hu->priv;
200
201	BT_DBG("hu %p", hu);
202
203	/* lock hcill state */
204	spin_lock_irqsave(&ll->hcill_lock, flags);
205
206	switch (ll->hcill_state) {
207	case HCILL_ASLEEP:
208	/* acknowledge device wake up */
209	if (send_hcill_cmd(HCILL_WAKE_UP_ACK, hu) < 0) {
210	BT_ERR("cannot acknowledge device wake up");
211	goto out;
212	}
213	break;
214	case HCILL_ASLEEP_TO_AWAKE:
215	/*
216	* this state means that a wake-up-indication
217	* is already on its way to the device,
218	* and will serve as the required wake-up-ack
219	*/
220	BT_DBG("dual wake-up-indication");
221	break;
222	default:
223	/* any other state are illegal */
224	BT_ERR("received HCILL_WAKE_UP_IND in state %ld", ll->hcill_state);
225	break;
226	}
227
228	/* send pending packets and change state to HCILL_AWAKE */
229	__ll_do_awake(ll);
230
231	out:
232	spin_unlock_irqrestore(&ll->hcill_lock, flags);
233
234	/* actually send the packets */
235	hci_uart_tx_wakeup(hu);
236	}
237
238	/*
239	* Called upon a sleep-indication from the device
240	*/
241	static void ll_device_want_to_sleep(struct hci_uart *hu)
242	{
243	unsigned long flags;
244	struct ll_struct *ll = hu->priv;
245
246	BT_DBG("hu %p", hu);
247
248	/* lock hcill state */
249	spin_lock_irqsave(&ll->hcill_lock, flags);
250
251	/* sanity check */
252	if (ll->hcill_state != HCILL_AWAKE)
253	BT_ERR("ERR: HCILL_GO_TO_SLEEP_IND in state %ld", ll->hcill_state);
254
255	/* acknowledge device sleep */
256	if (send_hcill_cmd(HCILL_GO_TO_SLEEP_ACK, hu) < 0) {
257	BT_ERR("cannot acknowledge device sleep");
258	goto out;
259	}
260
261	/* update state */
262	ll->hcill_state = HCILL_ASLEEP;
263
264	out:
265	spin_unlock_irqrestore(&ll->hcill_lock, flags);
266
267	/* actually send the sleep ack packet */
268	hci_uart_tx_wakeup(hu);
269	}
270
271	/*
272	* Called upon wake-up-acknowledgement from the device
273	*/
274	static void ll_device_woke_up(struct hci_uart *hu)
275	{
276	unsigned long flags;
277	struct ll_struct *ll = hu->priv;
278
279	BT_DBG("hu %p", hu);
280
281	/* lock hcill state */
282	spin_lock_irqsave(&ll->hcill_lock, flags);
283
284	/* sanity check */
285	if (ll->hcill_state != HCILL_ASLEEP_TO_AWAKE)
286	BT_ERR("received HCILL_WAKE_UP_ACK in state %ld", ll->hcill_state);
287
288	/* send pending packets and change state to HCILL_AWAKE */
289	__ll_do_awake(ll);
290
291	spin_unlock_irqrestore(&ll->hcill_lock, flags);
292
293	/* actually send the packets */
294	hci_uart_tx_wakeup(hu);
295	}
296
297	/* Enqueue frame for transmittion (padding, crc, etc) */
298	/* may be called from two simultaneous tasklets */
299	static int ll_enqueue(struct hci_uart hu, struct sk_buff skb)
300	{
301	unsigned long flags = 0;
302	struct ll_struct *ll = hu->priv;
303
304	BT_DBG("hu %p skb %p", hu, skb);
305
306	/* Prepend skb with frame type */
307	memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
308
309	/* lock hcill state */
310	spin_lock_irqsave(&ll->hcill_lock, flags);
311
312	/* act according to current state */
313	switch (ll->hcill_state) {
314	case HCILL_AWAKE:
315	BT_DBG("device awake, sending normally");
316	skb_queue_tail(&ll->txq, skb);
317	break;
318	case HCILL_ASLEEP:
319	BT_DBG("device asleep, waking up and queueing packet");
320	/* save packet for later */
321	skb_queue_tail(&ll->tx_wait_q, skb);
322	/* awake device */
323	if (send_hcill_cmd(HCILL_WAKE_UP_IND, hu) < 0) {
324	BT_ERR("cannot wake up device");
325	break;
326	}
327	ll->hcill_state = HCILL_ASLEEP_TO_AWAKE;
328	break;
329	case HCILL_ASLEEP_TO_AWAKE:
330	BT_DBG("device waking up, queueing packet");
331	/* transient state; just keep packet for later */
332	skb_queue_tail(&ll->tx_wait_q, skb);
333	break;
334	default:
335	BT_ERR("illegal hcill state: %ld (losing packet)", ll->hcill_state);
336	kfree_skb(skb);
337	break;
338	}
339
340	spin_unlock_irqrestore(&ll->hcill_lock, flags);
341
342	return 0;
343	}
344
345	static inline int ll_check_data_len(struct ll_struct *ll, int len)
346	{
347	register int room = skb_tailroom(ll->rx_skb);
348
349	BT_DBG("len %d room %d", len, room);
350
351	if (!len) {
352	hci_recv_frame(ll->rx_skb);
353	} else if (len > room) {
354	BT_ERR("Data length is too large");
355	kfree_skb(ll->rx_skb);
356	} else {
357	ll->rx_state = HCILL_W4_DATA;
358	ll->rx_count = len;
359	return len;
360	}
361
362	ll->rx_state = HCILL_W4_PACKET_TYPE;
363	ll->rx_skb = NULL;
364	ll->rx_count = 0;
365
366	return 0;
367	}
368
369	/* Recv data */
370	static int ll_recv(struct hci_uart hu, void data, int count)
371	{
372	struct ll_struct *ll = hu->priv;
373	register char *ptr;
374	struct hci_event_hdr *eh;
375	struct hci_acl_hdr *ah;
376	struct hci_sco_hdr *sh;
377	register int len, type, dlen;
378
379	BT_DBG("hu %p count %d rx_state %ld rx_count %ld", hu, count, ll->rx_state, ll->rx_count);
380
381	ptr = data;
382	while (count) {
383	if (ll->rx_count) {
384	len = min_t(unsigned int, ll->rx_count, count);
385	memcpy(skb_put(ll->rx_skb, len), ptr, len);
386	ll->rx_count -= len; count -= len; ptr += len;
387
388	if (ll->rx_count)
389	continue;
390
391	switch (ll->rx_state) {
392	case HCILL_W4_DATA:
393	BT_DBG("Complete data");
394	hci_recv_frame(ll->rx_skb);
395
396	ll->rx_state = HCILL_W4_PACKET_TYPE;
397	ll->rx_skb = NULL;
398	continue;
399
400	case HCILL_W4_EVENT_HDR:
401	eh = (struct hci_event_hdr *) ll->rx_skb->data;
402
403	BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen);
404
405	ll_check_data_len(ll, eh->plen);
406	continue;
407
408	case HCILL_W4_ACL_HDR:
409	ah = (struct hci_acl_hdr *) ll->rx_skb->data;
410	dlen = __le16_to_cpu(ah->dlen);
411
412	BT_DBG("ACL header: dlen %d", dlen);
413
414	ll_check_data_len(ll, dlen);
415	continue;
416
417	case HCILL_W4_SCO_HDR:
418	sh = (struct hci_sco_hdr *) ll->rx_skb->data;
419
420	BT_DBG("SCO header: dlen %d", sh->dlen);
421
422	ll_check_data_len(ll, sh->dlen);
423	continue;
424	}
425	}
426
427	/* HCILL_W4_PACKET_TYPE */
428	switch (*ptr) {
429	case HCI_EVENT_PKT:
430	BT_DBG("Event packet");
431	ll->rx_state = HCILL_W4_EVENT_HDR;
432	ll->rx_count = HCI_EVENT_HDR_SIZE;
433	type = HCI_EVENT_PKT;
434	break;
435
436	case HCI_ACLDATA_PKT:
437	BT_DBG("ACL packet");
438	ll->rx_state = HCILL_W4_ACL_HDR;
439	ll->rx_count = HCI_ACL_HDR_SIZE;
440	type = HCI_ACLDATA_PKT;
441	break;
442
443	case HCI_SCODATA_PKT:
444	BT_DBG("SCO packet");
445	ll->rx_state = HCILL_W4_SCO_HDR;
446	ll->rx_count = HCI_SCO_HDR_SIZE;
447	type = HCI_SCODATA_PKT;
448	break;
449
450	/* HCILL signals */
451	case HCILL_GO_TO_SLEEP_IND:
452	BT_DBG("HCILL_GO_TO_SLEEP_IND packet");
453	ll_device_want_to_sleep(hu);
454	ptr++; count--;
455	continue;
456
457	case HCILL_GO_TO_SLEEP_ACK:
458	/* shouldn't happen */
459	BT_ERR("received HCILL_GO_TO_SLEEP_ACK (in state %ld)", ll->hcill_state);
460	ptr++; count--;
461	continue;
462
463	case HCILL_WAKE_UP_IND:
464	BT_DBG("HCILL_WAKE_UP_IND packet");
465	ll_device_want_to_wakeup(hu);
466	ptr++; count--;
467	continue;
468
469	case HCILL_WAKE_UP_ACK:
470	BT_DBG("HCILL_WAKE_UP_ACK packet");
471	ll_device_woke_up(hu);
472	ptr++; count--;
473	continue;
474
475	default:
476	BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr);
477	hu->hdev->stat.err_rx++;
478	ptr++; count--;
479	continue;
480	};
481
482	ptr++; count--;
483
484	/* Allocate packet */
485	ll->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
486	if (!ll->rx_skb) {
487	BT_ERR("Can't allocate mem for new packet");
488	ll->rx_state = HCILL_W4_PACKET_TYPE;
489	ll->rx_count = 0;
490	return 0;
491	}
492
493	ll->rx_skb->dev = (void *) hu->hdev;
494	bt_cb(ll->rx_skb)->pkt_type = type;
495	}
496
497	return count;
498	}
499
500	static struct sk_buff ll_dequeue(struct hci_uart hu)
501	{
502	struct ll_struct *ll = hu->priv;
503	return skb_dequeue(&ll->txq);
504	}
505
506	static struct hci_uart_proto llp = {
507	.id = HCI_UART_LL,
508	.open = ll_open,
509	.close = ll_close,
510	.recv = ll_recv,
511	.enqueue = ll_enqueue,
512	.dequeue = ll_dequeue,
513	.flush = ll_flush,
514	};
515
516	int ll_init(void)
517	{
518	int err = hci_uart_register_proto(&llp);
519
520	if (!err)
521	BT_INFO("HCILL protocol initialized");
522	else
523	BT_ERR("HCILL protocol registration failed");
524
525	return err;
526	}
527
528	int ll_deinit(void)
529	{
530	return hci_uart_unregister_proto(&llp);
531	}