kernel_samsung_msm8974/drivers/bluetooth/bluesleep_fpga.c

/*
 * 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.
 *
 * 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
 *
 * 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.
 *
 * Copyright (C) 2006-2007 - Motorola
 * Copyright (c) 2008-2010, The Linux Foundation. All rights reserved.
 *
 *  Date         Author           Comment
 * -----------  --------------   --------------------------------
 * 2006-Apr-28  Motorola         The kernel module for running the Bluetooth(R)
 *                               Sleep-Mode Protocol from the Host side
 * 2006-Sep-08  Motorola         Added workqueue for handling sleep work.
 * 2007-Jan-24  Motorola         Added mbm_handle_ioi() call to ISR.
 * 2009-Aug-10  Motorola         Changed "add_timer" to "mod_timer" to solve
 *                               race when flurry of queued work comes in.
*/

#include <linux/module.h>       /* kernel module definitions */
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/notifier.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/timer.h>
#include <linux/uaccess.h>
#include <linux/version.h>
#include <linux/workqueue.h>
#include <linux/platform_device.h>

#include <linux/irq.h>
#include <linux/ioport.h>
#include <linux/param.h>
#include <linux/bitops.h>
#include <linux/termios.h>
#include <linux/wakelock.h>
#include <mach/gpio.h>
#include <linux/serial_core.h>
#include <mach/msm_serial_hs.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h> /* event notifications */
#include "hci_uart.h"

#include <linux/barcode_emul.h>
#include <linux/delay.h>

#include <linux/jiffies.h>

#define BT_SLEEP_DBG
#ifndef BT_SLEEP_DBG
#define BT_DBG(fmt, arg...)
#endif
#undef  BT_DBG
#undef BT_ERR
#define BT_DBG(fmt, arg...) pr_err(fmt " [BT]\n", ##arg)
#define BT_ERR(fmt, arg...) pr_err(fmt " [BT]\n", ##arg)

/*
 * Defines
 */

#define VERSION	 "1.1"
#define PROC_DIR	"bluetooth/sleep"

#define POLARITY_LOW 0
#define POLARITY_HIGH 1

enum msm_hs_clk_states_e {
	MSM_HS_CLK_PORT_OFF,     /* port not in use */
	MSM_HS_CLK_OFF,          /* clock disabled */
	MSM_HS_CLK_REQUEST_OFF,  /* disable after TX and RX flushed */
	MSM_HS_CLK_ON,           /* clock enabled */
};

struct bluesleep_info {
	unsigned host_wake;
	unsigned ext_wake;
	unsigned host_wake_irq;
	struct uart_port *uport;
	struct wake_lock wake_lock;
	int irq_polarity;
	int has_ext_wake;
};

/* work function */
static void bluesleep_sleep_work(struct work_struct *work);
static void bluesleep_uart_awake_work(struct work_struct *work);
static void bluesleep_ext_wake_set_wq(struct work_struct *work);

/* work queue */
DECLARE_DELAYED_WORK(sleep_workqueue, bluesleep_sleep_work);
DECLARE_DELAYED_WORK(uart_awake_workqueue, bluesleep_uart_awake_work);
DECLARE_DELAYED_WORK(tx_timer_expired_workqueue, bluesleep_ext_wake_set_wq);

/* Macros for handling sleep work */
#define bluesleep_rx_busy()     schedule_delayed_work(&sleep_workqueue, 0)
#define bluesleep_tx_busy()     schedule_delayed_work(&sleep_workqueue, 0)
#define bluesleep_rx_idle()     schedule_delayed_work(&sleep_workqueue, 0)
#define bluesleep_tx_idle()     schedule_delayed_work(&sleep_workqueue, 0)
#define bluesleep_uart_work()     schedule_delayed_work(&uart_awake_workqueue, 0)

#define bluesleep_tx_timer_expired()     schedule_delayed_work(&tx_timer_expired_workqueue, 0)

/* 3 second timeout */
#define TX_TIMER_INTERVAL  3

/* state variable names and bit positions */
#define BT_PROTO	 0x01
#define BT_TXDATA	 0x02
#define BT_ASLEEP	 0x04
#define BT_EXT_WAKE	0x08
#define BT_SUSPEND	0x10

static bool bt_enabled;

static struct platform_device *bluesleep_uart_dev;
static struct bluesleep_info *bsi;

/*
 * Local function prototypes
 */

/*
 * Global variables
 */
/** Global state flags */
static unsigned long flags;

/** Tasklet to respond to change in hostwake line */
static struct tasklet_struct hostwake_task;

/** Transmission timer */
static void bluesleep_tx_timer_expire(unsigned long data);
static DEFINE_TIMER(tx_timer, bluesleep_tx_timer_expire, 0, 0);

/** Lock for state transitions */
struct mutex bluesleep_mutex;

struct proc_dir_entry *bluetooth_dir, *sleep_dir;

/*
 * Local functions
 */

static int bluesleep_get_uart_state(void)
{
	int state = 0;

	state = msm_hs_get_clock_state(bsi->uport);
	return state;
}

static void bluesleep_uart_awake_work(struct work_struct *work)
{
	int clk_state;

	if (!bsi->uport) {
		BT_DBG("hsuart_power called. But uport is null");
		return;
	}

	clk_state = bluesleep_get_uart_state();
	if (clk_state == MSM_HS_CLK_OFF) {
		BT_DBG("bluesleep_uart_awake_work : hsuart_power on");
		msm_hs_request_clock_on(bsi->uport);
		msm_hs_set_mctrl(bsi->uport, TIOCM_RTS);
	}else if(clk_state == MSM_HS_CLK_REQUEST_OFF){
		bluesleep_uart_work();
	}
}
static void hsuart_power(int on)
{
    int clk_state;

    if (test_bit(BT_SUSPEND, &flags)) {
        BT_DBG("it's suspend state. waiting for resume.");
        return;
    }

    if (!bsi->uport) {
        BT_DBG("hsuart_power called. But uport is null");
        return;
    }

    if (on) {
        if(test_bit(BT_TXDATA, &flags)) {
            BT_DBG("hsuart_power on");
            msm_hs_request_clock_on(bsi->uport);
            msm_hs_set_mctrl(bsi->uport, TIOCM_RTS);
            return;
		}

        clk_state = bluesleep_get_uart_state();
        if(clk_state == MSM_HS_CLK_REQUEST_OFF) {
            BT_DBG("hsuart_power wait");
            bluesleep_uart_work();
        } else {
            BT_DBG("hsuart_power on");
            msm_hs_request_clock_on(bsi->uport);
            msm_hs_set_mctrl(bsi->uport, TIOCM_RTS);
        }
    } else {
        BT_DBG("hsuart_power off");
        msm_hs_set_mctrl(bsi->uport, 0);
        msm_hs_request_clock_off(bsi->uport);
    }
}

/**
 * @return 1 if the Host can go to sleep, 0 otherwise.
 */
int bluesleep_can_sleep(void)
{
	/* check if WAKE_BT_GPIO and BT_WAKE_GPIO are both deasserted */
	return (!gpio_get_value(bsi->host_wake) &&
		(bsi->uport != NULL));
}

void bluesleep_sleep_wakeup(void)
{
    if (test_bit(BT_ASLEEP, &flags)) {
        BT_DBG("waking up...");
        /*Activating UART */
        hsuart_power(1);
        wake_lock(&bsi->wake_lock);
        /* Start the timer */
        mod_timer(&tx_timer, jiffies + (msecs_to_jiffies(TX_TIMER_INTERVAL * 1000)));
        if (bsi->has_ext_wake == 1) {
            int ret;
            ret = ice_gpiox_set(bsi->ext_wake, 1);
            if (ret)
            {
                BT_ERR("(bluesleep_sleep_wakeup) failed to set ext_wake 1.");
                ret = ice_gpiox_set(bsi->ext_wake, 1);
                BT_ERR("ret = %d", ret);
            }
        }
        set_bit(BT_EXT_WAKE, &flags);
        clear_bit(BT_ASLEEP, &flags);
    }
    else {
        BT_DBG("bluesleep_sleep_wakeup : already wake up, so start timer...");
        mod_timer(&tx_timer, jiffies + (msecs_to_jiffies(TX_TIMER_INTERVAL * 1000)));
    }
}

static void bluesleep_ext_wake_set_wq(struct work_struct *work)
{
	int ret;
	ret = ice_gpiox_set(bsi->ext_wake, 0);
	if (ret)
		BT_ERR("(bluesleep_ext_wake_set_wq) failed to set ext_wake 0.");
}

static void bluesleep_tx_data_wakeup(void)
{
    if (test_bit(BT_ASLEEP, &flags)) {
        BT_DBG("waking up from BT Write...");

        wake_lock(&bsi->wake_lock);
        /* Start the timer */
        mod_timer(&tx_timer, jiffies + (msecs_to_jiffies(TX_TIMER_INTERVAL * 1000)));
        if (bsi->has_ext_wake == 1) {
            int ret;
            ret = ice_gpiox_set(bsi->ext_wake, 1);
            if (ret)
            {
                int retry_cnt;
                BT_ERR("(bluesleep_tx_data_wakeup) failed to set ext_wake 1.");
                for(retry_cnt=0 ; retry_cnt < 5 ; retry_cnt ++){
                    usleep(5000);
                    ret = ice_gpiox_set(bsi->ext_wake, 1);
                    BT_ERR("retry_cnt = %d", retry_cnt);
                    if(ret == 0)
                        break;
                }
            }
        }
        set_bit(BT_EXT_WAKE, &flags);
        clear_bit(BT_ASLEEP, &flags);
    }
    else {
        BT_DBG("bluesleep_tx_data_wakeup : already wake up, so start timer...");
        mod_timer(&tx_timer, jiffies + (msecs_to_jiffies(TX_TIMER_INTERVAL * 1000)));
    }
}




/**
 * @brief@  main sleep work handling function which update the flags
 * and activate and deactivate UART ,check FIFO.
 */
static void bluesleep_sleep_work(struct work_struct *work)
{
    if (mutex_is_locked(&bluesleep_mutex))
        BT_DBG("Wait for mutex unlock in bluesleep_sleep_work");

    mutex_lock(&bluesleep_mutex);

    if (bluesleep_can_sleep()) {
        /* already asleep, this is an error case */
        if (test_bit(BT_ASLEEP, &flags)) {
            BT_DBG("already asleep");
            mutex_unlock(&bluesleep_mutex);
            return;
        }

        if (msm_hs_tx_empty(bsi->uport)) {
            if (test_bit(BT_TXDATA, &flags)) {
                BT_DBG("TXDATA remained. Wait until timer expires.");

                mod_timer(&tx_timer, jiffies + msecs_to_jiffies(TX_TIMER_INTERVAL * 1000));
                mutex_unlock(&bluesleep_mutex);
                return;
            }

            BT_DBG("going to sleep...");

            set_bit(BT_ASLEEP, &flags);
            /*Deactivating UART */
            hsuart_power(0);

            /* Moved from Timer expired */
            if (bsi->has_ext_wake == 1) {
                int ret;
                ret = ice_gpiox_set(bsi->ext_wake, 0);
                if (ret)
                    BT_ERR("(bluesleep_sleep_work) failed to set ext_wake.");
            }
            clear_bit(BT_EXT_WAKE, &flags);

            /*Deactivating UART */
            /* UART clk is not turned off immediately. Release
            * wakelock after 500 ms.
            */
            wake_lock_timeout(&bsi->wake_lock, msecs_to_jiffies(500));
        } else {
            BT_DBG("host can enter sleep but some tx remained.");

            mod_timer(&tx_timer, jiffies + msecs_to_jiffies(TX_TIMER_INTERVAL * 1000));
            mutex_unlock(&bluesleep_mutex);
            return;
        }
    } else if (!test_bit(BT_EXT_WAKE, &flags)
            && !test_bit(BT_ASLEEP, &flags)) {
        BT_DBG("host_wake high and BT_EXT_WAKE & BT_ASLEEP already freed.");
        mod_timer(&tx_timer, jiffies + (msecs_to_jiffies(TX_TIMER_INTERVAL * 1000)));
        if (bsi->has_ext_wake == 1) {
            int ret;
            ret = ice_gpiox_set(bsi->ext_wake, 1);
            if (ret)
                BT_ERR("(bluesleep_sleep_work) failed to set ext_wake 1.");
        }
        set_bit(BT_EXT_WAKE, &flags);
    } else {
        bluesleep_sleep_wakeup();
    }
    mutex_unlock(&bluesleep_mutex);
}

/**
 * A tasklet function that runs in tasklet context and reads the value
 * of the HOST_WAKE GPIO pin and further defer the work.
 * @param data Not used.
 */
static void bluesleep_hostwake_task(unsigned long data)
{
	BT_DBG("hostwake line change");

	if ((gpio_get_value(bsi->host_wake) == bsi->irq_polarity))
		bluesleep_rx_busy();
	else
		bluesleep_rx_idle();
}

/**
 * Handles proper timer action when outgoing data is delivered to the
 * HCI line discipline. Sets BT_TXDATA.
 */
static void bluesleep_outgoing_data(void)
{
	/* prevent entered upload mode or bt reset. */
	/* if bluesleep_tx_timer_expire routine triggered, max 10ms wait for finish.
	*/
	int i;
	for(i=0; i<10 && !test_bit(BT_TXDATA, &flags)
				&& !test_bit(BT_EXT_WAKE, &flags)
				&& !test_bit(BT_ASLEEP, &flags); i++) {
		BT_DBG("bluesleep_tx_timer_expire routine has not yet finished. 1ms sleep");
		usleep(1000);
	}

	if (mutex_is_locked(&bluesleep_mutex))
		BT_DBG("Wait for mutex unlock in bluesleep_outgoing_data");

	mutex_lock(&bluesleep_mutex);
	/* log data passing by */
	set_bit(BT_TXDATA, &flags);

	BT_DBG("bluesleep_outgoing_data.");

	if (!test_bit(BT_EXT_WAKE, &flags))
		BT_DBG("BT_EXT_WAKE freed");

	if (!test_bit(BT_ASLEEP, &flags))
		BT_DBG("BT_ASLEEP freed");

	/*
	** Uart Clk should be enabled promptly
	** before bluedroid write TX data.
	*/
	hsuart_power(1);

	bluesleep_tx_data_wakeup();

	mutex_unlock(&bluesleep_mutex);
}

/**
 * Starts the Sleep-Mode Protocol on the Host.
 */
static void bluesleep_start(void)
{
	int retval;

	if (test_bit(BT_PROTO, &flags)) {
		return;
	}

	/* start the timer */
	mod_timer(&tx_timer, jiffies + msecs_to_jiffies(TX_TIMER_INTERVAL * 1000));

	/* assert BT_WAKE */
	if (bsi->has_ext_wake == 1) {
		int ret;
		ret = ice_gpiox_set(bsi->ext_wake, 1);
		if (ret)
			BT_ERR("(bluesleep_start) failed to set ext_wake 1.");
	}
	set_bit(BT_EXT_WAKE, &flags);
	retval = enable_irq_wake(bsi->host_wake_irq);
	if (retval < 0) {
		BT_ERR("Couldn't enable BT_HOST_WAKE as wakeup interrupt");
		goto fail;
	}
	set_bit(BT_PROTO, &flags);
	wake_lock(&bsi->wake_lock);
	return;
fail:
	del_timer(&tx_timer);

	return;
}

static void bluesleep_abnormal_stop(void)
{
    BT_ERR("bluesleep_abnormal_stop");

    if (!test_bit(BT_PROTO, &flags)) {
        BT_ERR("(bluesleep_abnormal_stop) proto is not set. Failed to stop bluesleep");
        bsi->uport = NULL;
        return;
    }

    del_timer(&tx_timer);
    clear_bit(BT_PROTO, &flags);

    if (disable_irq_wake(bsi->host_wake_irq))
        BT_ERR("Couldn't disable hostwake IRQ wakeup mode\n");
    wake_lock_timeout(&bsi->wake_lock, msecs_to_jiffies(500));

    clear_bit(BT_TXDATA, &flags);
    bsi->uport = NULL;
}

/**
 * Stops the Sleep-Mode Protocol on the Host.
 */
static void bluesleep_stop(void)
{
	if (!test_bit(BT_PROTO, &flags)) {
		BT_ERR("(bluesleep_stop_wq) proto is not set. Failed to stop bluesleep");
		bsi->uport = NULL;
		return;
	}
	/* assert BT_WAKE */
	if (bsi->has_ext_wake == 1) {
		int ret;
		ret = ice_gpiox_set(bsi->ext_wake, 1);
		if (ret)
			BT_ERR("(bluesleep_stop) failed to set ext_wake 1.");
	}
	set_bit(BT_EXT_WAKE, &flags);
	del_timer(&tx_timer);
	clear_bit(BT_PROTO, &flags);

	if (test_bit(BT_ASLEEP, &flags)) {
		clear_bit(BT_ASLEEP, &flags);
		hsuart_power(1);
	}

	if (disable_irq_wake(bsi->host_wake_irq))
		BT_ERR("Couldn't disable hostwake IRQ wakeup mode\n");
	wake_lock_timeout(&bsi->wake_lock, msecs_to_jiffies(500));

	bsi->uport = NULL;
}

struct uart_port *bluesleep_get_uart_port(void)
{
	struct uart_port *uport = NULL;

	uport = msm_hs_get_uart_port(0);
	if(uport == NULL)
		BT_ERR("(bluesleep_get_uart_port) uport is null");

	return uport;
}

static int bluesleep_read_proc_lpm(char *page, char **start, off_t offset,
					int count, int *eof, void *data)
{
	*eof = 1;
	return snprintf(page, count, "lpm: %u\n", bt_enabled?1:0 );
}

static int bluesleep_write_proc_lpm(struct file *file, const char *buffer,
					unsigned long count, void *data)
{
	char b;

    if (count < 1)
        return -EINVAL;

    if (copy_from_user(&b, buffer, 1))
        return -EFAULT;

    if (b == '0') {
        BT_ERR("(bluesleep_write_proc_lpm) Unreg HCI notifier.");
        /* HCI_DEV_UNREG */
        bluesleep_stop();
        bt_enabled = false;
        //bsi->uport = NULL;
    } else if (b == '1') {
        BT_ERR("(bluesleep_write_proc_lpm) Reg HCI notifier.");
        /* HCI_DEV_REG */
        if (!bt_enabled) {
            bt_enabled = true;
            bsi->uport = bluesleep_get_uart_port();
            /* if bluetooth started, start bluesleep*/
            bluesleep_start();
        }
    } else if (b == '2') {
        BT_ERR("(bluesleep_write_proc_lpm) don`t control ext_wake & uart clk");
        if(bt_enabled) {
            bt_enabled = false;
            bluesleep_abnormal_stop();
        }
    }

    return count;
}

static int bluesleep_read_proc_btwrite(char *page, char **start, off_t offset,
					int count, int *eof, void *data)
{
	*eof = 1;
	return snprintf(page, count, "unsupported to read\n");
}

static int bluesleep_write_proc_btwrite(struct file *file, const char *buffer,
					unsigned long count, void *data)
{
	char b;

	if (count < 1)
		return -EINVAL;

	if (copy_from_user(&b, buffer, 1))
		return -EFAULT;

	/* HCI_DEV_WRITE */
	if (b != '0')
		bluesleep_outgoing_data();

	return count;
}

/**
 * Handles transmission timer expiration.
 * @param data Not used.
 */
static void bluesleep_tx_timer_expire(unsigned long data)
{
	/* were we silent during the last timeout? */
	if (!test_bit(BT_TXDATA, &flags)) {
		BT_DBG("Tx has been idle");

		bluesleep_tx_idle();
	} else {
		BT_DBG("Tx data during last period");
		mod_timer(&tx_timer,
                jiffies + msecs_to_jiffies(TX_TIMER_INTERVAL * 1000));
	}

	/* clear the incoming data flag */
	clear_bit(BT_TXDATA, &flags);
}

/**
 * Schedules a tasklet to run when receiving an interrupt on the
 * <code>HOST_WAKE</code> GPIO pin.
 * @param irq Not used.
 * @param dev_id Not used.
 */
static irqreturn_t bluesleep_hostwake_isr(int irq, void *dev_id)
{
	/* schedule a tasklet to handle the change in the host wake line */
	tasklet_schedule(&hostwake_task);
	return IRQ_HANDLED;
}

/**
 * Read the <code>BT_WAKE</code> GPIO pin value via the proc interface.
 * When this function returns, <code>page</code> will contain a 1 if the
 * pin is high, 0 otherwise.
 * @param page Buffer for writing data.
 * @param start Not used.
 * @param offset Not used.
 * @param count Not used.
 * @param eof Whether or not there is more data to be read.
 * @param data Not used.
 * @return The number of bytes written.
 */
static int bluepower_read_proc_btwake(char *page, char **start, off_t offset,
					int count, int *eof, void *data)
{
	*eof = 1;
	return snprintf(page, count, "btwake:%u\n", \
				test_bit(BT_EXT_WAKE, &flags));
}

/**
 * Write the <code>BT_WAKE</code> GPIO pin value via the proc interface.
 * @param file Not used.
 * @param buffer The buffer to read from.
 * @param count The number of bytes to be written.
 * @param data Not used.
 * @return On success, the number of bytes written. On error, -1, and
 * <code>errno</code> is set appropriately.
 */
static int bluepower_write_proc_btwake(struct file *file, const char *buffer,
					unsigned long count, void *data)
{
	char *buf;

	if (count < 1)
		return -EINVAL;

	buf = kmalloc(count, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	if (copy_from_user(buf, buffer, count)) {
		kfree(buf);
		return -EFAULT;
	}
	if (buf[0] == '0') {
		if (bsi->has_ext_wake == 1) {
			int ret;
			ret = ice_gpiox_set(bsi->ext_wake, 0);
			if (ret)
				BT_ERR("(bluepower_write_proc_btwake) failed to set ext_wake 0.");
		}
		clear_bit(BT_EXT_WAKE, &flags);
	} else if (buf[0] == '1') {
		if (bsi->has_ext_wake == 1) {
			int ret;
			ret = ice_gpiox_set(bsi->ext_wake, 1);
			if (ret)
				BT_ERR("(bluepower_write_proc_btwake) failed to set ext_wake 1.");
		}
		set_bit(BT_EXT_WAKE, &flags);
	} else {
		kfree(buf);
		return -EINVAL;
	}

	kfree(buf);
	return count;
}

/**
 * Read the <code>BT_HOST_WAKE</code> GPIO pin value via the proc interface.
 * When this function returns, <code>page</code> will contain a 1 if the pin
 * is high, 0 otherwise.
 * @param page Buffer for writing data.
 * @param start Not used.
 * @param offset Not used.
 * @param count Not used.
 * @param eof Whether or not there is more data to be read.
 * @param data Not used.
 * @return The number of bytes written.
 */
static int bluepower_read_proc_hostwake(char *page, char **start, off_t offset,
					int count, int *eof, void *data)
{
	*eof = 1;
	return snprintf(page, count, "hostwake: %u\n", \
				gpio_get_value(bsi->host_wake));
}


/**
 * Read the low-power status of the Host via the proc interface.
 * When this function returns, <code>page</code> contains a 1 if the Host
 * is asleep, 0 otherwise.
 * @param page Buffer for writing data.
 * @param start Not used.
 * @param offset Not used.
 * @param count Not used.
 * @param eof Whether or not there is more data to be read.
 * @param data Not used.
 * @return The number of bytes written.
 */
static int bluesleep_read_proc_asleep(char *page, char **start, off_t offset,
					int count, int *eof, void *data)
{
	unsigned int asleep;

	asleep = test_bit(BT_ASLEEP, &flags) ? 1 : 0;
	*eof = 1;
	return snprintf(page, count, "asleep: %u\n", asleep);
}

/**
 * Read the low-power protocol being used by the Host via the proc interface.
 * When this function returns, <code>page</code> will contain a 1 if the Host
 * is using the Sleep Mode Protocol, 0 otherwise.
 * @param page Buffer for writing data.
 * @param start Not used.
 * @param offset Not used.
 * @param count Not used.
 * @param eof Whether or not there is more data to be read.
 * @param data Not used.
 * @return The number of bytes written.
 */
static int bluesleep_read_proc_proto(char *page, char **start, off_t offset,
					int count, int *eof, void *data)
{
	unsigned int proto;

	proto = test_bit(BT_PROTO, &flags) ? 1 : 0;
	*eof = 1;
	return snprintf(page, count, "proto: %u\n", proto);
}

/**
 * Modify the low-power protocol used by the Host via the proc interface.
 * @param file Not used.
 * @param buffer The buffer to read from.
 * @param count The number of bytes to be written.
 * @param data Not used.
 * @return On success, the number of bytes written. On error, -1, and
 * <code>errno</code> is set appropriately.
 */
static int bluesleep_write_proc_proto(struct file *file, const char *buffer,
					unsigned long count, void *data)
{
	char proto;

	if (count < 1)
		return -EINVAL;

	if (copy_from_user(&proto, buffer, 1))
		return -EFAULT;

	if (proto == '0')
		bluesleep_stop();
	else
		bluesleep_start();

	/* claim that we wrote everything */
	return count;
}

void bluesleep_setup_uart_port(struct platform_device *uart_dev)
{
	bluesleep_uart_dev = uart_dev;
}

static int bluesleep_probe(struct platform_device *pdev)
{
	int ret;
	struct resource *res;

	bsi = kzalloc(sizeof(struct bluesleep_info), GFP_KERNEL);
	if (!bsi)
		return -ENOMEM;

	res = platform_get_resource_byname(pdev, IORESOURCE_IO,
				"gpio_host_wake");

	if (!res) {
		BT_ERR("couldn't find host_wake gpio\n");
		ret = -ENODEV;
		goto free_bsi;
	}

	bsi->host_wake = res->start;

	ret = gpio_request(bsi->host_wake, "bt_host_wake");
	if (ret)
	{
		BT_ERR("bluesleep_probe gpio_request for host_wake is failed");
		goto free_bsi;
	}

	/* configure host_wake as input */
	gpio_tlmm_config(GPIO_CFG(bsi->host_wake, 0, GPIO_CFG_INPUT,
					GPIO_CFG_NO_PULL, GPIO_CFG_16MA), GPIO_CFG_ENABLE);
	ret = gpio_direction_input(bsi->host_wake);
	if (ret < 0) {
		BT_ERR("gpio-keys: failed to configure input direction for GPIO %d, error %d",
				bsi->host_wake, ret);
		gpio_free(bsi->host_wake);
		goto free_bsi;
	}

	res = platform_get_resource_byname(pdev, IORESOURCE_IO,
				"gpio_ext_wake");

	if (!res)
		bsi->has_ext_wake = 0;
	else
		bsi->has_ext_wake = 1;

	if (bsi->has_ext_wake) {
		bsi->ext_wake = res->start;
		/* uses FPGA
		ret = gpio_request(bsi->ext_wake, "bt_ext_wake");
		if (ret)
		{
			BT_ERR("bluesleep_probe gpio_request for bt_ext_wake is failed");
			goto free_bt_host_wake;
		}
		*/

		/* configure ext_wake as output mode*/
		/* uses FPGA
		ret = gpio_direction_output(bsi->ext_wake, 0);
		if (ret < 0) {
			BT_ERR("gpio-keys: failed to configure output direction for GPIO %d, error %d",
				  bsi->ext_wake, ret);
			gpio_free(bsi->ext_wake);
			goto free_bt_host_wake;
		}
		*/
	} else
		set_bit(BT_EXT_WAKE, &flags);

	res = platform_get_resource_byname(pdev, IORESOURCE_IRQ,
						"host_wake");
	if (!res) {
		BT_ERR("couldn't find host_wake irq\n");
		ret = -ENODEV;
		goto free_bt_host_wake;
	}
	bsi->host_wake_irq = res->start;
	if (bsi->host_wake_irq < 0) {
		BT_ERR("couldn't find host_wake irq\n");
		ret = -ENODEV;
		goto free_bt_ext_wake;
	}
	if (res->flags & IORESOURCE_IRQ_LOWEDGE)
		bsi->irq_polarity = POLARITY_LOW;/*low edge (falling edge)*/
	else
		bsi->irq_polarity = POLARITY_HIGH;/*anything else*/

	wake_lock_init(&bsi->wake_lock, WAKE_LOCK_SUSPEND, "bluesleep");
	clear_bit(BT_SUSPEND, &flags);

	if (bsi->irq_polarity == POLARITY_LOW) {
		ret = request_irq(bsi->host_wake_irq, bluesleep_hostwake_isr,
				IRQF_DISABLED | IRQF_TRIGGER_FALLING,
				"bluetooth_hostwake", NULL);
	} else {
		ret = request_irq(bsi->host_wake_irq, bluesleep_hostwake_isr,
				IRQF_DISABLED | IRQF_TRIGGER_RISING,
				"bluetooth_hostwake", NULL);
	}
	if (ret  < 0) {
		BT_ERR("Couldn't acquire BT_HOST_WAKE IRQ");
		goto free_bt_ext_wake;
	}

	return 0;

free_bt_ext_wake:
	//gpio_free(bsi->ext_wake);
free_bt_host_wake:
	gpio_free(bsi->host_wake);
free_bsi:
	kfree(bsi);
	bsi = NULL;
	return ret;
}

static int bluesleep_remove(struct platform_device *pdev)
{
	free_irq(bsi->host_wake_irq, NULL);
	gpio_free(bsi->host_wake);
	//gpio_free(bsi->ext_wake);
	wake_lock_destroy(&bsi->wake_lock);
	kfree(bsi);
	bsi = NULL;
	return 0;
}


static int bluesleep_resume(struct platform_device *pdev)
{
	if (test_bit(BT_SUSPEND, &flags)) {
		if (!bt_enabled) {
			gpio_tlmm_config(GPIO_CFG(bsi->host_wake, 0, GPIO_CFG_INPUT,
						GPIO_CFG_NO_PULL, GPIO_CFG_16MA), GPIO_CFG_ENABLE);
		}

		clear_bit(BT_SUSPEND, &flags);
		if ((bsi->uport != NULL) &&
			(gpio_get_value(bsi->host_wake) == bsi->irq_polarity)) {
				BT_DBG("bluesleep resume form BT event...");
				hsuart_power(1);
		}
	}
	return 0;
}

static int bluesleep_suspend(struct platform_device *pdev, pm_message_t state)
{
	if (!bt_enabled) {
		gpio_tlmm_config(GPIO_CFG(bsi->host_wake, 0, GPIO_CFG_INPUT,
						GPIO_CFG_PULL_DOWN, GPIO_CFG_16MA), GPIO_CFG_ENABLE);
	}

	set_bit(BT_SUSPEND, &flags);
	return 0;
}

static struct platform_driver bluesleep_driver = {
	.probe = bluesleep_probe,
	.remove = bluesleep_remove,
	.suspend = bluesleep_suspend,
	.resume = bluesleep_resume,
	.driver = {
		.name = "bluesleep",
		.owner = THIS_MODULE,
	},
};
/**
 * Initializes the module.
 * @return On success, 0. On error, -1, and <code>errno</code> is set
 * appropriately.
 */
static int __init bluesleep_init(void)
{
    int retval;
    struct proc_dir_entry *ent;

    BT_INFO("BlueSleep Mode Driver Ver %s", VERSION);
    bt_enabled = false;
    retval = platform_driver_register(&bluesleep_driver);

    if (retval)
        return retval;

    if (bsi == NULL)
    {
        BT_ERR("bluesleep_init failed. bsi is NULL!!");
        return -1;
    }

    bluetooth_dir = proc_mkdir("bluetooth", NULL);
    if (bluetooth_dir == NULL) {
        BT_ERR("Unable to create /proc/bluetooth directory");
        return -ENOMEM;
    }

    sleep_dir = proc_mkdir("sleep", bluetooth_dir);
    if (sleep_dir == NULL) {
        BT_ERR("Unable to create /proc/%s directory", PROC_DIR);
        return -ENOMEM;
    }

    /* Creating read/write "btwake" entry */
    ent = create_proc_entry("btwake", 0, sleep_dir);
    if (ent == NULL) {
        BT_ERR("Unable to create /proc/%s/btwake entry", PROC_DIR);
        retval = -ENOMEM;
        goto fail;
    }
    ent->read_proc = bluepower_read_proc_btwake;
    ent->write_proc = bluepower_write_proc_btwake;

    /* read only proc entries */
    if (create_proc_read_entry("hostwake", 0, sleep_dir,
                bluepower_read_proc_hostwake, NULL) == NULL) {
        BT_ERR("Unable to create /proc/%s/hostwake entry", PROC_DIR);
        retval = -ENOMEM;
        goto fail;
    }

    /* read/write proc entries */
    ent = create_proc_entry("proto", 0, sleep_dir);
    if (ent == NULL) {
        BT_ERR("Unable to create /proc/%s/proto entry", PROC_DIR);
        retval = -ENOMEM;
        goto fail;
    }
    ent->read_proc = bluesleep_read_proc_proto;
    ent->write_proc = bluesleep_write_proc_proto;

    /* read only proc entries */
    if (create_proc_read_entry("asleep", 0,
            sleep_dir, bluesleep_read_proc_asleep, NULL) == NULL) {
        BT_ERR("Unable to create /proc/%s/asleep entry", PROC_DIR);
        retval = -ENOMEM;
        goto fail;
    }

    /* read/write proc entries */
    ent = create_proc_entry("lpm", 0, sleep_dir);
    if (ent == NULL) {
        BT_ERR("Unable to create /proc/%s/lpm entry", PROC_DIR);
        retval = -ENOMEM;
        goto fail;
    }
    ent->read_proc = bluesleep_read_proc_lpm;
    ent->write_proc = bluesleep_write_proc_lpm;

    /* read/write proc entries */
    ent = create_proc_entry("btwrite", 0, sleep_dir);
    if (ent == NULL) {
        BT_ERR("Unable to create /proc/%s/btwrite entry", PROC_DIR);
        retval = -ENOMEM;
        goto fail;
    }
    ent->read_proc = bluesleep_read_proc_btwrite;
    ent->write_proc = bluesleep_write_proc_btwrite;

    flags = 0; /* clear all status bits */

    /* Initialize spinlock. */
    mutex_init(&bluesleep_mutex);

    /* Initialize timer */
    init_timer(&tx_timer);
    tx_timer.function = bluesleep_tx_timer_expire;
    tx_timer.data = 0;

    /* initialize host wake tasklet */
    tasklet_init(&hostwake_task, bluesleep_hostwake_task, 0);

    /* assert bt wake */
    /* block code for FPGA to be set-up
    if (bsi->has_ext_wake == 1) {
        int ret;
        ret = ice_gpiox_set(bsi->ext_wake, 1);
        if (ret)
            BT_ERR("(bluesleep_init) failed to set ext_wake 1.");
    }
    */
    set_bit(BT_EXT_WAKE, &flags);

    return 0;

fail:
    remove_proc_entry("btwrite", sleep_dir);
    remove_proc_entry("lpm", sleep_dir);
    remove_proc_entry("asleep", sleep_dir);
    remove_proc_entry("proto", sleep_dir);
    remove_proc_entry("hostwake", sleep_dir);
    remove_proc_entry("btwake", sleep_dir);
    remove_proc_entry("sleep", bluetooth_dir);
    remove_proc_entry("bluetooth", 0);
    return retval;
}

/**
 * Cleans up the module.
 */
static void __exit bluesleep_exit(void)
{
	if (bsi == NULL)
		return;

	/* assert bt wake */
	if (bsi->has_ext_wake == 1) {
		int ret;
		ret = ice_gpiox_set(bsi->ext_wake, 1);
		if (ret)
			BT_ERR("(bluesleep_exit) failed to set ext_wake 1.");
	}
	set_bit(BT_EXT_WAKE, &flags);
	if (test_bit(BT_PROTO, &flags)) {
		if (disable_irq_wake(bsi->host_wake_irq))
			BT_ERR("Couldn't disable hostwake IRQ wakeup mode\n");
		free_irq(bsi->host_wake_irq, NULL);
		del_timer(&tx_timer);
		if (test_bit(BT_ASLEEP, &flags))
			hsuart_power(1);
	}

	platform_driver_unregister(&bluesleep_driver);

	remove_proc_entry("btwrite", sleep_dir);
	remove_proc_entry("lpm", sleep_dir);
	remove_proc_entry("asleep", sleep_dir);
	remove_proc_entry("proto", sleep_dir);
	remove_proc_entry("hostwake", sleep_dir);
	remove_proc_entry("btwake", sleep_dir);
	remove_proc_entry("sleep", bluetooth_dir);
	remove_proc_entry("bluetooth", 0);

	mutex_destroy(&bluesleep_mutex);
}

module_init(bluesleep_init);
module_exit(bluesleep_exit);

MODULE_DESCRIPTION("Bluetooth Sleep Mode Driver ver %s " VERSION);
#ifdef MODULE_LICENSE
MODULE_LICENSE("GPL");
#endif