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Commit 4f3cc422 authored by Rupesh Tatiya's avatar Rupesh Tatiya
Browse files

Bluetooth: add Qualcomm In-Band Sleep support to hci_uart 



Add new HCIUART protocol HCIUART_IBS which enables the Bluetooth
device to enter a low power state when possible.  It also tells
the msm_serial_hs UART driver that it may go to a low-power state
even though the port is open.

This code was originally written by Mike Feldman in
project: kernel/msm branch: android-msm-2.6.29b
commit: 81fda6eb1b506a36bcdbbe77a59b6fe82c997568 (Bluetooth:
add Qualcomm In-Band Sleep support to hci_uart).

CRs-Fixed: 713897
Change-Id: I18207f076c9fb39c04275a8db2625a2d31bb0ae2
Git-commit: 81fda6eb1b506a36bcdbbe77a59b6fe82c997568
[ananthk@codeaurora.org: Resolved merge conflicts]
Signed-off-by: default avatarAnantha Krishnan <ananthk@codeaurora.org>
Signed-off-by: default avatarRupesh Tatiya <rtatiya@codeaurora.org>
parent f108fc85

drivers/bluetooth/Kconfig

+11 −0
Original line number Diff line number Diff line
@@ -94,6 +94,17 @@ config BT_HCIUART_3WIRE 


	  Say Y here to compile support for Three-wire UART protocol.



config BT_HCIUART_IBS

	bool "HCI_IBS protocol support"

	depends on BT_HCIUART

	default n

	help

	  HCI_IBS (HCI In-Band Sleep) is a serial protocol for communication

	  between Bluetooth device and host. This protocol is required for

	  UART clock control for some Qualcomm Bluetooth devices.



	  Say Y here to compile support for HCI_IBS protocol.



config BT_HCIBCM203X

	tristate "HCI BCM203x USB driver"

	depends on USB

drivers/bluetooth/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -30,6 +30,7 @@ hci_uart-$(CONFIG_BT_HCIUART_BCSP) += hci_bcsp.o 
hci_uart-$(CONFIG_BT_HCIUART_LL)	+= hci_ll.o

hci_uart-$(CONFIG_BT_HCIUART_ATH3K)	+= hci_ath.o

hci_uart-$(CONFIG_BT_HCIUART_3WIRE)	+= hci_h5.o

hci_uart-$(CONFIG_BT_HCIUART_IBS)	+= hci_ibs.o

hci_uart-objs				:= $(hci_uart-y)



ccflags-y += -D__CHECK_ENDIAN__

drivers/bluetooth/hci_ibs.c

0 → 100644
+816 −0
Original line number Diff line number Diff line 
/*

 *  Qualcomm's Bluetooth Software In-Band Sleep UART protocol

 *

 *  HCI_IBS (HCI In-Band Sleep) is Qualcomm's power management

 *  protocol extension to H4.

 *

 *  Copyright (C) 2007 Texas Instruments, Inc.

 *  Copyright (c) 2010, Code Aurora Forum. All rights reserved.

 *

 *  Acknowledgements:

 *  This file is based on hci_ll.c, which was...

 *  Written by Ohad Ben-Cohen <ohad@bencohen.org>

 *  which was in turn 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.

 */



#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/timer.h>

#include <linux/skbuff.h>

#include <linux/serial_core.h>



#ifdef CONFIG_SERIAL_MSM_HS

#include <mach/msm_serial_hs.h>

#endif



#include <net/bluetooth/bluetooth.h>

#include <net/bluetooth/hci_core.h>



#include "hci_uart.h"



/* HCI_IBS protocol messages */

#define HCI_IBS_SLEEP_IND	0xFE

#define HCI_IBS_WAKE_IND	0xFD

#define HCI_IBS_WAKE_ACK	0xFC



/* HCI_IBS receiver States */

#define HCI_IBS_W4_PACKET_TYPE	0

#define HCI_IBS_W4_EVENT_HDR	1

#define HCI_IBS_W4_ACL_HDR	2

#define HCI_IBS_W4_SCO_HDR	3

#define HCI_IBS_W4_DATA		4



/* HCI_IBS transmit side sleep protocol states */

enum tx_ibs_states_e {

	HCI_IBS_TX_ASLEEP,

	HCI_IBS_TX_WAKING,

	HCI_IBS_TX_AWAKE,

};



/* HCI_IBS receive side sleep protocol states */

enum rx_states_e {

	HCI_IBS_RX_ASLEEP,

	HCI_IBS_RX_AWAKE,

};



/* HCI_IBS transmit and receive side clock state vote */

enum hci_ibs_clock_state_vote_e {

	HCI_IBS_VOTE_STATS_UPDATE,

	HCI_IBS_TX_VOTE_CLOCK_ON,

	HCI_IBS_TX_VOTE_CLOCK_OFF,

	HCI_IBS_RX_VOTE_CLOCK_ON,

	HCI_IBS_RX_VOTE_CLOCK_OFF,

};



static unsigned long wake_retrans = 1;

static unsigned long tx_idle_delay = (HZ * 2);



struct hci_ibs_cmd {

	u8 cmd;

} __packed;



struct ibs_struct {

	unsigned long rx_state;

	unsigned long rx_count;

	struct sk_buff *rx_skb;

	struct sk_buff_head txq;

	struct sk_buff_head tx_wait_q;	/* HCI_IBS wait queue	*/

	spinlock_t hci_ibs_lock;	/* HCI_IBS state lock	*/

	unsigned long tx_ibs_state;	/* HCI_IBS transmit side power state */

	unsigned long rx_ibs_state;	/* HCI_IBS receive side power state */

	unsigned long tx_vote;		/* clock must be on for TX */

	unsigned long rx_vote;		/* clock must be on for RX */

	struct	timer_list tx_idle_timer;

	struct	timer_list wake_retrans_timer;

	/* debug */

	unsigned long ibs_sent_wacks;

	unsigned long ibs_sent_slps;

	unsigned long ibs_sent_wakes;

	unsigned long ibs_recv_wacks;

	unsigned long ibs_recv_slps;

	unsigned long ibs_recv_wakes;

	unsigned long vote_last_jif;

	unsigned long vote_on_ticks;

	unsigned long vote_off_ticks;

	unsigned long tx_votes_on;

	unsigned long rx_votes_on;

	unsigned long tx_votes_off;

	unsigned long rx_votes_off;

	unsigned long votes_on;

	unsigned long votes_off;

};



#ifdef CONFIG_SERIAL_MSM_HS

static void __ibs_msm_serial_clock_on(struct tty_struct *tty)

{

	struct uart_state *state = tty->driver_data;

	struct uart_port *port = state->port;



	msm_hs_request_clock_on(port);

}



static void __ibs_msm_serial_clock_request_off(struct tty_struct *tty)

{

	struct uart_state *state = tty->driver_data;

	struct uart_port *port = state->port;



	msm_hs_request_clock_off(port);

}

#else

static inline void __ibs_msm_serial_clock_on(struct tty_struct *tty) {}

static inline void __ibs_msm_serial_clock_request_off(struct tty_struct *tty) {}

#endif



/* clock_vote needs to be called with the ibs lock held */

static void ibs_msm_serial_clock_vote(unsigned long vote, struct hci_uart *hu)

{

	struct ibs_struct *ibs = hu->priv;



	unsigned long old_vote = (ibs->tx_vote | ibs->rx_vote);

	unsigned long new_vote;



	switch (vote) {

	default: /* error */

		BT_ERR("voting irregularity");

		return;

	case HCI_IBS_VOTE_STATS_UPDATE:

		if (old_vote)

			ibs->vote_off_ticks += (jiffies - ibs->vote_last_jif);

		else

			ibs->vote_on_ticks += (jiffies - ibs->vote_last_jif);

		return;

	case HCI_IBS_TX_VOTE_CLOCK_ON:

		ibs->tx_vote = 1;

		ibs->tx_votes_on++;

		new_vote = 1;

		break;

	case HCI_IBS_RX_VOTE_CLOCK_ON:

		ibs->rx_vote = 1;

		ibs->rx_votes_on++;

		new_vote = 1;

		break;

	case HCI_IBS_TX_VOTE_CLOCK_OFF:

		ibs->tx_vote = 0;

		ibs->tx_votes_off++;

		new_vote = ibs->rx_vote | ibs->tx_vote;

		break;

	case HCI_IBS_RX_VOTE_CLOCK_OFF:

		ibs->rx_vote = 0;

		ibs->rx_votes_off++;

		new_vote = ibs->rx_vote | ibs->tx_vote;

		break;

	}

	if (new_vote != old_vote) {

		if (new_vote)

			__ibs_msm_serial_clock_on(hu->tty);

		else

			__ibs_msm_serial_clock_request_off(hu->tty);



		BT_DBG("HCIUART_IBS: vote msm_serial_hs clock %lu(%lu)",

			new_vote, vote);

		/* debug */

		if (new_vote) {

			ibs->votes_on++;

			ibs->vote_off_ticks += (jiffies - ibs->vote_last_jif);

		} else {

			ibs->votes_off++;

			ibs->vote_on_ticks += (jiffies - ibs->vote_last_jif);

		}

		ibs->vote_last_jif = jiffies;

	}

}



/*

 * Builds and sends an HCI_IBS command packet.

 * These are very simple packets with only 1 cmd byte

 */

static int send_hci_ibs_cmd(u8 cmd, struct hci_uart *hu)

{

	int err = 0;

	struct sk_buff *skb = NULL;

	struct ibs_struct *ibs = hu->priv;

	struct hci_ibs_cmd *hci_ibs_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 HCI_IBS packet");

		err = -ENOMEM;

		goto out;

	}



	/* prepare packet */

	hci_ibs_packet = (struct hci_ibs_cmd *) skb_put(skb, 1);

	hci_ibs_packet->cmd = cmd;

	skb->dev = (void *) hu->hdev;



	/* send packet */

	skb_queue_tail(&ibs->txq, skb);

out:

	return err;

}



static void hci_ibs_tx_idle_timeout(unsigned long arg)

{

	struct hci_uart *hu = (struct hci_uart *) arg;

	struct ibs_struct *ibs = hu->priv;

	unsigned long flags;

	unsigned long vote_tx_sleep = 0;



	BT_DBG("hu %p idle timeout in %lu state", hu, ibs->tx_ibs_state);



	spin_lock_irqsave_nested(&ibs->hci_ibs_lock,

					flags, SINGLE_DEPTH_NESTING);



	switch (ibs->tx_ibs_state) {

	default:

	case HCI_IBS_TX_ASLEEP:

	case HCI_IBS_TX_WAKING:

		BT_ERR("spurrious timeout in tx state %ld", ibs->tx_ibs_state);

		goto out;

	case HCI_IBS_TX_AWAKE: /* TX_IDLE, go to SLEEP */

		if (send_hci_ibs_cmd(HCI_IBS_SLEEP_IND, hu) < 0) {

			BT_ERR("cannot send SLEEP to device");

			goto out;

		}

		ibs->tx_ibs_state = HCI_IBS_TX_ASLEEP;

		ibs->ibs_sent_slps++; /* debug */

		vote_tx_sleep = 1;

		break;

	}



	spin_unlock_irqrestore(&ibs->hci_ibs_lock, flags);



	hci_uart_tx_wakeup(hu);  /* run HCI tx handling unlocked */



	if (!vote_tx_sleep)

		return;

	/* now that message queued to tty driver, vote for tty clocks off */

	/* It is up to the tty driver to pend the clocks off until tx done. */



	spin_lock_irqsave_nested(&ibs->hci_ibs_lock,

					flags, SINGLE_DEPTH_NESTING);

	ibs_msm_serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);

out:

	spin_unlock_irqrestore(&ibs->hci_ibs_lock, flags);

}



static void hci_ibs_wake_retrans_timeout(unsigned long arg)

{

	struct hci_uart *hu = (struct hci_uart *) arg;

	struct ibs_struct *ibs = hu->priv;

	unsigned long flags;

	unsigned long retransmit = 0;



	BT_DBG("hu %p wake retransmit timeout in %lu state",

		hu, ibs->tx_ibs_state);



	spin_lock_irqsave_nested(&ibs->hci_ibs_lock,

					flags, SINGLE_DEPTH_NESTING);



	switch (ibs->tx_ibs_state) {

	default:

	case HCI_IBS_TX_ASLEEP:

	case HCI_IBS_TX_AWAKE:

		BT_ERR("spurrious timeout tx state %ld", ibs->tx_ibs_state);

		goto out;

	case HCI_IBS_TX_WAKING: /* No WAKE_ACK, retransmit WAKE */

		retransmit = 1;

		if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) {

			BT_ERR("cannot acknowledge device wake up");

			goto out;

		}

		ibs->ibs_sent_wakes++; /* debug */

		mod_timer(&ibs->wake_retrans_timer, jiffies + wake_retrans);

		break;

	}

out:

	spin_unlock_irqrestore(&ibs->hci_ibs_lock, flags);

	if (retransmit)

		hci_uart_tx_wakeup(hu);

}



/* Initialize protocol */

static int ibs_open(struct hci_uart *hu)

{

	struct ibs_struct *ibs;



	BT_DBG("hu %p", hu);



	ibs = kzalloc(sizeof(*ibs), GFP_ATOMIC);

	if (!ibs)

		return -ENOMEM;



	skb_queue_head_init(&ibs->txq);

	skb_queue_head_init(&ibs->tx_wait_q);

	spin_lock_init(&ibs->hci_ibs_lock);



	/* Assume we start with both sides asleep -- extra wakes OK */

	ibs->tx_ibs_state = HCI_IBS_TX_ASLEEP;

	ibs->rx_ibs_state = HCI_IBS_RX_ASLEEP;

	/* clocks actually on, but we start votes off */

	ibs->tx_vote = 0;

	ibs->rx_vote = 0;



	/* debug */

	ibs->ibs_sent_wacks = 0;

	ibs->ibs_sent_slps = 0;

	ibs->ibs_sent_wakes = 0;

	ibs->ibs_recv_wacks = 0;

	ibs->ibs_recv_slps = 0;

	ibs->ibs_recv_wakes = 0;

	ibs->vote_last_jif = jiffies;

	ibs->vote_on_ticks = 0;

	ibs->vote_off_ticks = 0;

	ibs->votes_on = 0;

	ibs->votes_off = 0;

	ibs->tx_votes_on = 0;

	ibs->tx_votes_off = 0;

	ibs->rx_votes_on = 0;

	ibs->rx_votes_off = 0;



	hu->priv = ibs;



	init_timer(&ibs->wake_retrans_timer);

	ibs->wake_retrans_timer.function = hci_ibs_wake_retrans_timeout;

	ibs->wake_retrans_timer.data     = (u_long) hu;



	init_timer(&ibs->tx_idle_timer);

	ibs->tx_idle_timer.function = hci_ibs_tx_idle_timeout;

	ibs->tx_idle_timer.data     = (u_long) hu;



	BT_INFO("HCI_IBS open, tx_idle_delay=%lu, wake_retrans=%lu",

		tx_idle_delay, wake_retrans);



	return 0;

}



void ibs_log_local_stats(struct ibs_struct *ibs)

{

	BT_INFO("HCI_IBS stats: tx_idle_delay=%lu, wake_retrans=%lu",

		tx_idle_delay, wake_retrans);



	BT_INFO("HCI_IBS stats: tx_ibs_state=%lu, rx_ibs_state=%lu",

		ibs->tx_ibs_state, ibs->rx_ibs_state);

	BT_INFO("HCI_IBS stats: sent: sleep=%lu, wake=%lu, wake_ack=%lu",

		ibs->ibs_sent_slps, ibs->ibs_sent_wakes, ibs->ibs_sent_wacks);

	BT_INFO("HCI_IBS stats: recv: sleep=%lu, wake=%lu, wake_ack=%lu",

		ibs->ibs_recv_slps, ibs->ibs_recv_wakes, ibs->ibs_recv_wacks);



	BT_INFO("HCI_IBS stats: queues: txq=%s, txwaitq=%s",

		skb_queue_empty(&(ibs->txq)) ? "empty" : "full",

		skb_queue_empty(&(ibs->tx_wait_q)) ? "empty" : "full");



	BT_INFO("HCI_IBS stats: vote state: tx=%lu, rx=%lu",

		ibs->tx_vote, ibs->rx_vote);

	BT_INFO("HCI_IBS stats: tx votes cast: on=%lu, off=%lu",

		ibs->tx_votes_on, ibs->tx_votes_off);

	BT_INFO("HCI_IBS stats: rx votes cast: on=%lu, off=%lu",

		ibs->rx_votes_on, ibs->rx_votes_off);

	BT_INFO("HCI_IBS stats: msm_clock votes cast: on=%lu, off=%lu",

		ibs->votes_on, ibs->votes_off);

	BT_INFO("HCI_IBS stats: vote ticks: on=%lu, off=%lu",

		ibs->vote_on_ticks, ibs->vote_off_ticks);

}



/* Flush protocol data */

static int ibs_flush(struct hci_uart *hu)

{

	struct ibs_struct *ibs = hu->priv;



	BT_DBG("hu %p", hu);



	skb_queue_purge(&ibs->tx_wait_q);

	skb_queue_purge(&ibs->txq);



	return 0;

}



/* Close protocol */

static int ibs_close(struct hci_uart *hu)

{

	struct ibs_struct *ibs = hu->priv;



	BT_DBG("hu %p", hu);



	ibs_msm_serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu);

	ibs_log_local_stats(ibs);



	skb_queue_purge(&ibs->tx_wait_q);

	skb_queue_purge(&ibs->txq);

	del_timer(&ibs->tx_idle_timer);

	del_timer(&ibs->wake_retrans_timer);



	kfree_skb(ibs->rx_skb);



	hu->priv = NULL;



	kfree(ibs);



	return 0;

}



/*

 * Called upon a wake-up-indication from the device

 */

static void ibs_device_want_to_wakeup(struct hci_uart *hu)

{

	unsigned long flags;

	struct ibs_struct *ibs = hu->priv;



	BT_DBG("hu %p", hu);



	/* lock hci_ibs state */

	spin_lock_irqsave(&ibs->hci_ibs_lock, flags);



	/* debug */

	ibs->ibs_recv_wakes++;



	switch (ibs->rx_ibs_state) {

	case HCI_IBS_RX_ASLEEP:

		/* Make sure clock is on - we may have turned clock off since

		 * receiving the wake up indicator

		 */

		ibs_msm_serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu);

		ibs->rx_ibs_state = HCI_IBS_RX_AWAKE;

		/* deliberate fall-through */

	case HCI_IBS_RX_AWAKE:

		/* Always acknowledge device wake up,

		 * sending IBS message doesn't count as TX ON.

		 */

		if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) {

			BT_ERR("cannot acknowledge device wake up");

			goto out;

		}

		ibs->ibs_sent_wacks++; /* debug */

		break;

	default:

		/* any other state is illegal */

		BT_ERR("received HCI_IBS_WAKE_IND in rx state %ld",

			ibs->rx_ibs_state);

		break;

	}



out:

	spin_unlock_irqrestore(&ibs->hci_ibs_lock, flags);



	/* actually send the packets */

	hci_uart_tx_wakeup(hu);

}



/*

 * Called upon a sleep-indication from the device

 */

static void ibs_device_want_to_sleep(struct hci_uart *hu)

{

	unsigned long flags;

	struct ibs_struct *ibs = hu->priv;



	BT_DBG("hu %p", hu);



	/* lock hci_ibs state */

	spin_lock_irqsave(&ibs->hci_ibs_lock, flags);



	/* debug */

	ibs->ibs_recv_slps++;



	switch (ibs->rx_ibs_state) {

	case HCI_IBS_RX_AWAKE:

		/* update state */

		ibs->rx_ibs_state = HCI_IBS_RX_ASLEEP;

		ibs_msm_serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu);

		break;

	case HCI_IBS_RX_ASLEEP:

		/* deliberate fall-through */

	default:

		/* any other state is illegal */

		BT_ERR("received HCI_IBS_SLEEP_IND in rx state %ld",

			ibs->rx_ibs_state);

		break;

	}



	spin_unlock_irqrestore(&ibs->hci_ibs_lock, flags);

}



/*

 * Called upon wake-up-acknowledgment from the device

 */

static void ibs_device_woke_up(struct hci_uart *hu)

{

	unsigned long flags;

	struct ibs_struct *ibs = hu->priv;

	struct sk_buff *skb = NULL;



	BT_DBG("hu %p", hu);



	/* lock hci_ibs state */

	spin_lock_irqsave(&ibs->hci_ibs_lock, flags);



	/* debug */

	ibs->ibs_recv_wacks++;



	switch (ibs->tx_ibs_state) {

	case HCI_IBS_TX_ASLEEP:

		/* This could be spurrious rx wake on the BT chip.

		 * Send it another SLEEP othwise it will stay awake. */

	default:

		BT_ERR("received HCI_IBS_WAKE_ACK in tx state %ld",

			ibs->tx_ibs_state);

		break;

	case HCI_IBS_TX_AWAKE:

		/* expect one if we send 2 WAKEs */

		BT_DBG("received HCI_IBS_WAKE_ACK in tx state %ld",

			ibs->tx_ibs_state);

		break;

	case HCI_IBS_TX_WAKING:

		/* send pending packets */

		while ((skb = skb_dequeue(&ibs->tx_wait_q)))

			skb_queue_tail(&ibs->txq, skb);

		/* switch timers and change state to HCI_IBS_TX_AWAKE */

		del_timer(&ibs->wake_retrans_timer);

		mod_timer(&ibs->tx_idle_timer, jiffies + tx_idle_delay);

		ibs->tx_ibs_state = HCI_IBS_TX_AWAKE;

	}



	spin_unlock_irqrestore(&ibs->hci_ibs_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 ibs_enqueue(struct hci_uart *hu, struct sk_buff *skb)

{

	unsigned long flags = 0;

	struct ibs_struct *ibs = 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 hci_ibs state */

	spin_lock_irqsave(&ibs->hci_ibs_lock, flags);



	/* act according to current state */

	switch (ibs->tx_ibs_state) {

	case HCI_IBS_TX_AWAKE:

		BT_DBG("device awake, sending normally");

		skb_queue_tail(&ibs->txq, skb);

		mod_timer(&ibs->tx_idle_timer, jiffies + tx_idle_delay);

		break;



	case HCI_IBS_TX_ASLEEP:

		BT_DBG("device asleep, waking up and queueing packet");

		ibs_msm_serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu);

		/* save packet for later */

		skb_queue_tail(&ibs->tx_wait_q, skb);

		/* awake device */

		if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) {

			BT_ERR("cannot send WAKE to device");

			break;

		}

		ibs->ibs_sent_wakes++; /* debug */



		/* start retransmit timer */

		mod_timer(&ibs->wake_retrans_timer, jiffies + wake_retrans);



		ibs->tx_ibs_state = HCI_IBS_TX_WAKING;

		break;



	case HCI_IBS_TX_WAKING:

		BT_DBG("device waking up, queueing packet");

		/* transient state; just keep packet for later */

		skb_queue_tail(&ibs->tx_wait_q, skb);

		break;



	default:

		BT_ERR("illegal tx state: %ld (losing packet)",

			ibs->tx_ibs_state);

		kfree_skb(skb);

		break;

	}



	spin_unlock_irqrestore(&ibs->hci_ibs_lock, flags);



	return 0;

}



static inline int ibs_check_data_len(struct ibs_struct *ibs, int len)

{

	register int room = skb_tailroom(ibs->rx_skb);



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



	if (!len) {

		hci_recv_frame(ibs->rx_skb);

	} else if (len > room) {

		BT_ERR("Data length is too large");

		kfree_skb(ibs->rx_skb);

	} else {

		ibs->rx_state = HCI_IBS_W4_DATA;

		ibs->rx_count = len;

		return len;

	}



	ibs->rx_state = HCI_IBS_W4_PACKET_TYPE;

	ibs->rx_skb   = NULL;

	ibs->rx_count = 0;



	return 0;

}



/* Recv data */

static int ibs_recv(struct hci_uart *hu, void *data, int count)

{

	struct ibs_struct *ibs = 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, ibs->rx_state, ibs->rx_count);



	ptr = data;

	while (count) {

		if (ibs->rx_count) {

			len = min_t(unsigned int, ibs->rx_count, count);

			memcpy(skb_put(ibs->rx_skb, len), ptr, len);

			ibs->rx_count -= len; count -= len; ptr += len;



			if (ibs->rx_count)

				continue;



			switch (ibs->rx_state) {

			case HCI_IBS_W4_DATA:

				BT_DBG("Complete data");

				hci_recv_frame(ibs->rx_skb);



				ibs->rx_state = HCI_IBS_W4_PACKET_TYPE;

				ibs->rx_skb = NULL;

				continue;



			case HCI_IBS_W4_EVENT_HDR:

				eh = (struct hci_event_hdr *) ibs->rx_skb->data;



				BT_DBG("Event header: evt 0x%2.2x plen %d",

					eh->evt, eh->plen);



				ibs_check_data_len(ibs, eh->plen);

				continue;



			case HCI_IBS_W4_ACL_HDR:

				ah = (struct hci_acl_hdr *) ibs->rx_skb->data;

				dlen = __le16_to_cpu(ah->dlen);



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



				ibs_check_data_len(ibs, dlen);

				continue;



			case HCI_IBS_W4_SCO_HDR:

				sh = (struct hci_sco_hdr *) ibs->rx_skb->data;



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



				ibs_check_data_len(ibs, sh->dlen);

				continue;

			}

		}



		/* HCI_IBS_W4_PACKET_TYPE */

		switch (*ptr) {

		case HCI_EVENT_PKT:

			BT_DBG("Event packet");

			ibs->rx_state = HCI_IBS_W4_EVENT_HDR;

			ibs->rx_count = HCI_EVENT_HDR_SIZE;

			type = HCI_EVENT_PKT;

			break;



		case HCI_ACLDATA_PKT:

			BT_DBG("ACL packet");

			ibs->rx_state = HCI_IBS_W4_ACL_HDR;

			ibs->rx_count = HCI_ACL_HDR_SIZE;

			type = HCI_ACLDATA_PKT;

			break;



		case HCI_SCODATA_PKT:

			BT_DBG("SCO packet");

			ibs->rx_state = HCI_IBS_W4_SCO_HDR;

			ibs->rx_count = HCI_SCO_HDR_SIZE;

			type = HCI_SCODATA_PKT;

			break;



		/* HCI_IBS signals */

		case HCI_IBS_SLEEP_IND:

			BT_DBG("HCI_IBS_SLEEP_IND packet");

			ibs_device_want_to_sleep(hu);

			ptr++; count--;

			continue;



		case HCI_IBS_WAKE_IND:

			BT_DBG("HCI_IBS_WAKE_IND packet");

			ibs_device_want_to_wakeup(hu);

			ptr++; count--;

			continue;



		case HCI_IBS_WAKE_ACK:

			BT_DBG("HCI_IBS_WAKE_ACK packet");

			ibs_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 */

		ibs->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);

		if (!ibs->rx_skb) {

			BT_ERR("Can't allocate mem for new packet");

			ibs->rx_state = HCI_IBS_W4_PACKET_TYPE;

			ibs->rx_count = 0;

			return 0;

		}



		ibs->rx_skb->dev = (void *) hu->hdev;

		bt_cb(ibs->rx_skb)->pkt_type = type;

	}



	return count;

}



static struct sk_buff *ibs_dequeue(struct hci_uart *hu)

{

	struct ibs_struct *ibs = hu->priv;



	return skb_dequeue(&ibs->txq);

}



static struct hci_uart_proto ibs_p = {

	.id		= HCI_UART_IBS,

	.open		= ibs_open,

	.close		= ibs_close,

	.recv		= ibs_recv,

	.enqueue	= ibs_enqueue,

	.dequeue	= ibs_dequeue,

	.flush		= ibs_flush,

};



int ibs_init(void)

{

	int err = hci_uart_register_proto(&ibs_p);



	if (!err)

		BT_INFO("HCI_IBS protocol initialized");

	else

		BT_ERR("HCI_IBS protocol registration failed");



	return err;

}



int ibs_deinit(void)

{

	return hci_uart_unregister_proto(&ibs_p);

}



module_param(wake_retrans, ulong, 0644);

MODULE_PARM_DESC(wake_retrans, "Delay (1/HZ) to retransmit WAKE_IND");



module_param(tx_idle_delay, ulong, 0644);

MODULE_PARM_DESC(tx_idle_delay, "Delay (1/HZ) since last tx for SLEEP_IND");

drivers/bluetooth/hci_ldisc.c

+7 −1
Original line number Diff line number Diff line
@@ -2,9 +2,9 @@ 
 *

 *  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>

 *  Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved.

 *

 *

 *  This program is free software; you can redistribute it and/or modify
@@ -625,6 +625,9 @@ static int __init hci_uart_init(void) 
#ifdef CONFIG_BT_HCIUART_3WIRE

	h5_init();

#endif

#ifdef CONFIG_BT_HCIUART_IBS

	ibs_init();

#endif



	return 0;

}
@@ -648,6 +651,9 @@ static void __exit hci_uart_exit(void) 
#ifdef CONFIG_BT_HCIUART_3WIRE

	h5_deinit();

#endif

#ifdef CONFIG_BT_HCIUART_IBS

	ibs_deinit();

#endif



	/* Release tty registration of line discipline */

	err = tty_unregister_ldisc(N_HCI);

drivers/bluetooth/hci_uart.h

+7 −1
Original line number Diff line number Diff line
@@ -2,9 +2,9 @@ 
 *

 *  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>

 *  Copyright (c) 2000-2001, 2010, Code Aurora Forum. All rights reserved.

 *

 *

 *  This program is free software; you can redistribute it and/or modify
@@ -43,6 +43,7 @@ 
#define HCI_UART_H4DS	3

#define HCI_UART_LL	4

#define HCI_UART_ATH3K	5

#define HCI_UART_IBS	6



#define HCI_UART_RAW_DEVICE	0

#define HCI_UART_RESET_ON_INIT	1
@@ -116,3 +117,8 @@ int ath_deinit(void); 
int h5_init(void);

int h5_deinit(void);

#endif



#ifdef CONFIG_BT_HCIUART_IBS

int ibs_init(void);

int ibs_deinit(void);

#endif