xradio_btlpm.patch

diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index 851842372c9b..a138a8f03073 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -342,6 +342,16 @@ config BT_HCIVHCI
 	  Say Y here to compile support for virtual HCI devices into the
 	  kernel or say M to compile it as module (hci_vhci).
 
+config XR_BT_LPM
+	tristate "Xradio Bluetooth sleep driver support"
+	help
+	  Bluetooth Bluetooth sleep Driver.
+	  This driver provides the dynamic active power saving mechanism for
+	  bluetooth radio devices.
+
+	  Say Y here to compile support for bluesleep support into the kernel
+	  or say M to compile it as module (bluesleep).
+
 config BT_MRVL
 	tristate "Marvell Bluetooth driver support"
 	help
diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile
index 16286ea2655d..e74d04136482 100644
--- a/drivers/bluetooth/Makefile
+++ b/drivers/bluetooth/Makefile
@@ -35,6 +35,8 @@ obj-$(CONFIG_BT_HCIRSI)		+= btrsi.o
 btmrvl-y			:= btmrvl_main.o
 btmrvl-$(CONFIG_DEBUG_FS)	+= btmrvl_debugfs.o
 
+obj-$(CONFIG_XR_BT_LPM)     += xradio_btlpm.o
+
 hci_uart-y				:= hci_ldisc.o
 hci_uart-$(CONFIG_BT_HCIUART_SERDEV)	+= hci_serdev.o
 hci_uart-$(CONFIG_BT_HCIUART_H4)	+= hci_h4.o
diff --git a/drivers/bluetooth/xradio_btlpm.c b/drivers/bluetooth/xradio_btlpm.c
new file mode 100644
index 000000000000..3c5829f6fd67
--- /dev/null
+++ b/drivers/bluetooth/xradio_btlpm.c
@@ -0,0 +1,895 @@
+/*
+** Bluetooth sleep and wakeup host interface for XRADIO Drivers
+**
+** Copyright (c) 2013, XRadio
+** Author: XRadio
+**
+** 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.
+*/
+#include <linux/module.h>
+#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/param.h>
+#include <linux/bitops.h>
+#include <linux/termios.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
+#include <linux/pm_wakeirq.h>
+#include <linux/serial_core.h>
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+
+
+#define BT_SLEEP_DEBUG
+
+#ifdef BT_SLEEP_DEBUG
+#define BT_SLEEP_DBG(fmt, arg...) printk(KERN_DEBUG "[XR_BT_LPM] %s: " fmt "\n", __func__, ## arg)
+#else
+#define BT_SLEEP_DBG(fmt, arg...)
+#endif
+
+#define BT_SLEEP_INF(fmt, arg...) printk(KERN_INFO "[XR_BT_LPM] %s: " fmt "\n", __func__, ## arg)
+#define VERSION					"1.0.10"
+#define PROC_SLEEP_DIR			"bluetooth/sleep"
+#define PROC_POWER_DIR			"bluetooth/power"
+#define BT_BLUEDROID_SUPPORT 	1
+
+#define AW1732_BT				1
+#define XRADIO_ETF_RFKILL		1
+
+struct xr_btsleep_info {
+	unsigned int wakeup_enable;
+	unsigned int host_wake;
+	unsigned int ext_wake;
+	unsigned int host_wake_irq;
+	struct wakeup_source *ws;
+	struct uart_port *uport;
+	unsigned int host_wake_polarity:1;
+	unsigned int bt_wake_polarity:1;
+	struct platform_device *pdev;
+};
+
+/* work function */
+static void bluesleep_sleep_work(struct work_struct *work);
+
+
+/* work queue */
+DECLARE_DELAYED_WORK(sleep_workqueue, bluesleep_sleep_work);
+
+
+/* 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_wake_up()     schedule_delayed_work(&sleep_workqueue, 0)
+#define bluesleep_standby()     schedule_delayed_work(&sleep_workqueue, 0)
+
+
+
+/* 10 second timeout */
+#define TX_TIMER_INTERVAL	2	//10s
+
+/* state variable names and bit positions */
+#define BT_PROTO	0x01
+#define BT_TXDATA	0x02
+#define BT_ASLEEP	0x04
+
+
+/* variable use indicate lpm modle */
+volatile bool has_lpm_enabled;
+
+/* struct use save platform_device from uart */
+static struct platform_device *bluesleep_uart_dev;
+static struct xr_btsleep_info *bsi;
+
+/* Global state flags */
+static unsigned long flags;
+
+#ifdef AW1732_BT
+/* module usage */
+static atomic_t open_count = ATOMIC_INIT(1);
+/* Tasklet to respond to change in hostwake line */
+static struct tasklet_struct hostwake_task;
+#endif
+
+/* Transmission timer */
+static struct timer_list tx_timer;
+
+/* Lock for state transitions */
+static spinlock_t rw_lock;
+static spinlock_t irq_lock;
+
+
+struct proc_dir_entry *bluetooth_dir, *sleep_dir;
+
+#ifdef XRADIO_ETF_RFKILL
+struct proc_dir_entry *power_dir;
+volatile char power_state_save;
+#endif
+
+/*
+ * bt go to sleep will call this function tell uart stop data interactive
+ */
+static void hsuart_power(int on)
+{
+	if (bsi->uport == NULL) {
+		return;
+	}
+	if (on) {
+		bsi->uport->ops->set_mctrl(bsi->uport, TIOCM_RTS);
+	} else {
+		bsi->uport->ops->set_mctrl(bsi->uport, 0);
+	}
+}
+
+/**
+ * @return 1 if the Host can go to sleep, 0 otherwise.
+ */
+static inline int bluesleep_can_sleep(void)
+{
+	/* check if HOST_WAKE_BT_GPIO and BT_WAKE_HOST_GPIO are both deasserted */
+	int flag1, flag2;
+	flag1 = !test_bit(BT_TXDATA, &flags);
+	flag2 = (bsi->uport != NULL);
+	BT_SLEEP_DBG(" !BT_TXDATA is %d, bsi->uport is %d", flag1, flag2);
+	return (flag1 && flag2);
+}
+
+/*
+ * after bt wakeup should clean BT_ASLEEP flag and start time.
+ */
+int bluesleep_sleep_wakeup(void)
+{
+	int poll_count = 0;
+	BT_SLEEP_DBG("test_bit(BT_ASLEEP, &flags) %d", test_bit(BT_ASLEEP, &flags));
+	if (gpio_get_value(bsi->ext_wake) != bsi->bt_wake_polarity ||
+		gpio_get_value(bsi->host_wake) != bsi->host_wake_polarity ||
+		test_bit(BT_ASLEEP, &flags) == 1) {
+		BT_SLEEP_DBG("waking up...");
+		/*Activating UART */
+		hsuart_power(1);
+		gpio_set_value(bsi->ext_wake, bsi->bt_wake_polarity);
+		//add poll bsi->hostwake
+		while (poll_count++ < 6) {
+			mdelay(25);
+			if (gpio_get_value(bsi->host_wake) == 1) {
+				BT_SLEEP_DBG("bt device active");
+				/*wake up, maybe no data or cmd need send to fw*/
+				/*so didn't change TXDATA in here*/
+				clear_bit(BT_ASLEEP, &flags);
+				return 0;
+			}
+		}
+		/*
+		*add once more wakeup operation when first operation failed,
+		*because if host wakeup device during device is wakeuped by yourself,
+		*device maybe couldn't receive wakeup GPIO rise-up signal
+		*/
+		poll_count = 0;
+		while (poll_count++ < 6) {
+			mdelay(25);
+			if (gpio_get_value(bsi->host_wake) == 1) {
+				BT_SLEEP_DBG("bt device active");
+				/*wake up, maybe no data or cmd need send to fw*/
+				/*so didn't change TXDATA in here*/
+				clear_bit(BT_ASLEEP, &flags);
+				return 0;
+			}
+		}
+		return 1;
+	} else {
+		BT_SLEEP_DBG("bluesleep_sleep_wakeup del_timer");
+		del_timer(&tx_timer);
+		return 0;
+	}
+	return 1;
+}
+
+/**
+ * @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 (!has_lpm_enabled) {
+		BT_SLEEP_DBG("lpm disabled already");
+		return;
+	}
+
+	if (bluesleep_can_sleep()) {
+		/* already asleep, this is an error case */
+		if (test_bit(BT_ASLEEP, &flags)) {
+			BT_SLEEP_DBG("already asleep");
+			return;
+		}
+		if (bsi->uport->ops->tx_empty(bsi->uport)) {
+			BT_SLEEP_DBG("going to sleep...");
+			gpio_set_value(bsi->ext_wake, !bsi->bt_wake_polarity);
+			set_bit(BT_ASLEEP, &flags);
+			clear_bit(BT_TXDATA, &flags);
+			/*Deactivating UART */
+			hsuart_power(0);
+			__pm_relax(bsi->ws);
+		}
+	} else {
+		bluesleep_sleep_wakeup();
+	}
+}
+
+#ifdef AW1732_BT
+static void bluesleep_hostwake_task(unsigned long data)
+{
+	BT_SLEEP_DBG("hostwake line change");
+	if (!has_lpm_enabled) {
+		return;
+	}
+	spin_lock(&rw_lock);
+	//wakeup signal from fw
+	if (test_bit(BT_ASLEEP, &flags) && !test_bit(BT_TXDATA, &flags)) {
+		clear_bit(BT_ASLEEP, &flags);
+		mod_timer(&tx_timer, jiffies + (TX_TIMER_INTERVAL * HZ));
+		bluesleep_sleep_wakeup();
+	}
+	spin_unlock(&rw_lock);
+}
+#endif
+
+
+static void bluesleep_outgoing_data(void)
+{
+	unsigned long irq_flags;
+	BT_SLEEP_DBG();
+	spin_lock_irqsave(&rw_lock, irq_flags);
+	/* log data passing by */
+	set_bit(BT_TXDATA, &flags);
+	/* if the tx side is sleeping... */
+	if (gpio_get_value(bsi->ext_wake) != bsi->bt_wake_polarity ||
+			gpio_get_value(bsi->host_wake) != bsi->host_wake_polarity) {
+		BT_SLEEP_DBG("tx was sleeping");
+		if (bluesleep_sleep_wakeup() == 1) {
+			BT_SLEEP_DBG("can't wakeup bt device!");
+		}
+	}
+	spin_unlock_irqrestore(&rw_lock, irq_flags);
+}
+
+static struct uart_port *bluesleep_get_uart_port(void)
+{
+	struct uart_port *uport = NULL;
+	BT_INFO("%s enter.", __func__);
+	if (bluesleep_uart_dev) {
+		uport = platform_get_drvdata(bluesleep_uart_dev);
+		BT_INFO("%s get uart_port from blusleep_uart_dev: %s",
+					__func__, bluesleep_uart_dev->name);
+	}
+	return uport;
+}
+
+#ifdef AW1732_BT
+static void bluesleep_tx_timer_expire(struct timer_list *t)
+{
+	unsigned long irq_flags;
+	spin_lock_irqsave(&rw_lock, irq_flags);
+	BT_SLEEP_DBG("Tx timer expired");
+	/* were we silent during the last timeout */
+	if (!test_bit(BT_ASLEEP, &flags) && !test_bit(BT_TXDATA, &flags)) {
+		BT_SLEEP_DBG("Tx has been idle");
+		bluesleep_tx_idle();
+	} else {
+		BT_SLEEP_DBG("Tx data during last period");
+	}
+
+	del_timer(&tx_timer);
+	/* clear the incoming data flag */
+	spin_unlock_irqrestore(&rw_lock, irq_flags);
+}
+
+
+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);
+	__pm_stay_awake(bsi->ws);
+	return IRQ_HANDLED;
+}
+
+
+static int bluesleep_start(void)
+{
+	int retval;
+	unsigned long irq_flags;
+
+	spin_lock_irqsave(&rw_lock, irq_flags);
+	if (test_bit(BT_PROTO, &flags)) {
+		spin_unlock_irqrestore(&rw_lock, irq_flags);
+		return 0;
+	}
+	spin_unlock_irqrestore(&rw_lock, irq_flags);
+
+	if (!atomic_dec_and_test(&open_count)) {
+		atomic_inc(&open_count);
+		return -EBUSY;
+	}
+	/*wake up bt device ,initial irq service*/
+	gpio_set_value(bsi->ext_wake, bsi->bt_wake_polarity);
+	retval = request_irq(bsi->host_wake_irq, bluesleep_hostwake_isr,
+				bsi->host_wake_polarity ? IRQF_TRIGGER_RISING : IRQF_TRIGGER_FALLING,
+				"bluetooth hostwake", &bsi->pdev->dev);
+
+	if (retval  < 0) {
+		BT_ERR("Couldn't acquire BT_HOST_WAKE IRQ");
+		goto fail;
+	}
+
+	set_bit(BT_PROTO, &flags);
+	__pm_stay_awake(bsi->ws);
+
+	return 0;
+
+
+fail:
+	atomic_inc(&open_count);
+	return retval;
+}
+
+static void bluesleep_stop(void)
+{
+	unsigned long irq_flags;
+
+	spin_lock_irqsave(&rw_lock, irq_flags);
+
+	if (!test_bit(BT_PROTO, &flags)) {
+		spin_unlock_irqrestore(&rw_lock, irq_flags);
+		return;
+	}
+
+	clear_bit(BT_PROTO, &flags);
+	del_timer(&tx_timer);
+
+	if (test_bit(BT_ASLEEP, &flags)) {
+		clear_bit(BT_ASLEEP, &flags);
+		hsuart_power(1);
+	}
+
+	if (test_bit(BT_TXDATA, &flags)) {
+		clear_bit(BT_TXDATA, &flags);
+	}
+
+	atomic_inc(&open_count);
+	spin_unlock_irqrestore(&rw_lock, irq_flags);
+	free_irq(bsi->host_wake_irq, &bsi->pdev->dev);
+	__pm_wakeup_event(bsi->ws, jiffies_to_msecs(HZ * 5));
+}
+#endif
+
+
+#ifdef XRADIO_ETF_RFKILL
+extern void sunxi_bluetooth_set_power(bool on_off);
+
+static int bluetooth_pwr_proc_show(struct seq_file *m, void *v)
+{
+	seq_printf(m, "power state: %d\n", power_state_save);
+	return 0;
+}
+
+static int bluetooth_pwr_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, bluetooth_pwr_proc_show, NULL);
+}
+
+static ssize_t bluetooth_write_proc_pwr(struct file *file, const char __user *buffer,
+					size_t count, loff_t *pos)
+{
+	char b;
+
+	if (count < 1)
+		return -EINVAL;
+
+	if (copy_from_user(&b, buffer, 1))
+		return -EFAULT;
+
+	if (b == '0') {
+		BT_SLEEP_INF("bt power off");
+		//sunxi_bluetooth_set_power(false);
+		power_state_save = 0;
+	} else {
+		BT_SLEEP_INF("bt power on");
+		//sunxi_bluetooth_set_power(true);
+		power_state_save = 1;
+	}
+
+	return count;
+}
+#endif
+
+static int bluedroid_lpm_proc_show(struct seq_file *m, void *v)
+{
+	seq_printf(m, "lpm enable: %d\n", has_lpm_enabled);
+	return 0;
+}
+
+static int bluedroid_lpm_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, bluedroid_lpm_proc_show, NULL);
+}
+
+static ssize_t bluedroid_write_proc_lpm(struct file *file, const char __user *buffer,
+					size_t count, loff_t *pos)
+
+{
+	char b;
+
+	if (count < 1)
+		return -EINVAL;
+
+	if (copy_from_user(&b, buffer, 1))
+		return -EFAULT;
+
+#ifdef AW1732_BT
+	if (b == '0') {
+		has_lpm_enabled = false;
+		BT_SLEEP_DBG("disable lpm mode");
+		bluesleep_stop();
+		bsi->uport = NULL;
+	} else {
+		BT_SLEEP_DBG("enable lpm mode");
+		if (!has_lpm_enabled) {
+			has_lpm_enabled = true;
+			if (bluesleep_uart_dev)
+				bsi->uport = bluesleep_get_uart_port();
+			bluesleep_start();
+		}
+	}
+#else 	//work around for aw1722 wakeup bt before brom download
+	if (b == '0') {			//disable lpm mode
+		BT_SLEEP_DBG("disable lpm mode");
+		has_lpm_enabled = false;
+	} else {				//enable lpm mode
+		BT_SLEEP_DBG("enable lpm mode");
+		has_lpm_enabled = true;
+		if (bluesleep_uart_dev)
+			bsi->uport = bluesleep_get_uart_port();
+	}
+#endif
+
+	return count;
+}
+
+static int bluedroid_btwrite_proc_show(struct seq_file *m, void *v)
+{
+	seq_printf(m, "it's not support\n");
+	return 0;
+}
+
+static int bluedroid_btwrite_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, bluedroid_btwrite_proc_show, NULL);
+}
+
+static ssize_t bluedroid_write_proc_btwrite(struct file *file, const char __user *buffer,
+					size_t count, loff_t *pos)
+{
+	char b;
+
+	if (count < 1)
+		return -EINVAL;
+
+	if (copy_from_user(&b, buffer, 1))
+		return -EFAULT;
+
+	BT_SLEEP_DBG("bluedroid_write_proc_btwrite %c", b);
+	if (b == '1') {
+		mdelay(10);
+		set_bit(BT_TXDATA, &flags);
+		bluesleep_outgoing_data();
+		//start the timer when host receive event but reply no data or cmd send to fw
+		del_timer(&tx_timer);
+	} else if (b == '0') {
+		clear_bit(BT_TXDATA, &flags);
+		bluesleep_tx_idle();
+	}
+	return count;
+}
+
+static int bluedroid_btwake_proc_show(struct seq_file *m, void *v)
+{
+	seq_printf(m, "bt wake state:%d\n", gpio_get_value(bsi->ext_wake));
+	return 0;
+}
+
+static int bluedroid_btwake_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, bluedroid_btwake_proc_show, NULL);
+}
+
+static ssize_t bluedroid_write_proc_btwake(struct file *file, const char __user *buffer,
+					size_t count, loff_t *pos)
+{
+	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;
+	}
+	BT_SLEEP_DBG("bluedroid_write_proc_btwake %c", buf[0]);
+	if (buf[0] == '0') {
+		BT_SLEEP_DBG("bt sleeping");
+		gpio_set_value(bsi->ext_wake, !bsi->bt_wake_polarity);
+	} else if (buf[0] == '1') {
+		BT_SLEEP_DBG("wakeup bt device");
+		gpio_set_value(bsi->ext_wake, bsi->bt_wake_polarity);
+	} else {
+		kfree(buf);
+		return -EINVAL;
+	}
+
+	kfree(buf);
+	return count;
+}
+
+#ifdef XRADIO_ETF_RFKILL
+static const struct proc_ops pwr_fops = {
+	// .owner	= THIS_MODULE,
+	.proc_open 	= bluetooth_pwr_proc_open,
+	.proc_read	= seq_read,
+	// .llseek	= seq_lseek,
+	.proc_release	= single_release,
+	.proc_write 	= bluetooth_write_proc_pwr,
+};
+#endif
+
+static const struct proc_ops lpm_fops = {
+	// .owner	= THIS_MODULE,
+	.proc_open 	= bluedroid_lpm_proc_open,
+	.proc_read	= seq_read,
+	// .llseek	= seq_lseek,
+	.proc_release	= single_release,
+	.proc_write 	= bluedroid_write_proc_lpm,
+};
+static const struct proc_ops btwrite_fops = {
+	// .owner	= THIS_MODULE,
+	.proc_open 	= bluedroid_btwrite_proc_open,
+	.proc_read	= seq_read,
+	// .llseek	= seq_lseek,
+	.proc_release	= single_release,
+	.proc_write 	= bluedroid_write_proc_btwrite,
+};
+static const struct proc_ops btwake_fops = {
+	// .owner	= THIS_MODULE,
+	.proc_open 	= bluedroid_btwake_proc_open,
+	.proc_read	= seq_read,
+	// .llseek	= seq_lseek,
+	.proc_release	= single_release,
+	.proc_write 	= bluedroid_write_proc_btwake,
+};
+
+static int assert_level = -1;
+module_param(assert_level, int, S_IRUGO);
+MODULE_PARM_DESC(assert_level, "BT_LPM hostwake/btwake assert level");
+
+static struct platform_device *sw_uart_get_pdev(int id)
+{
+	struct device_node *np;
+	char match[20];
+	sprintf(match, "uart%d", id);
+	np = of_find_node_by_type(NULL, match);
+	return of_find_device_by_node(np);
+}
+
+static int bluesleep_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct device *dev = &pdev->dev;
+	enum of_gpio_flags config;
+	int ret;
+	u32 val;
+
+	bsi = devm_kzalloc(&pdev->dev, sizeof(struct xr_btsleep_info), GFP_KERNEL);
+	if (!bsi)
+		return -ENOMEM;
+
+	//get bt_wake & bt_host_wake from sys_config.fex
+	bsi->ext_wake = of_get_named_gpio_flags(np, "bt_wake", 0, &config);
+	if (!gpio_is_valid(bsi->ext_wake)) {
+		BT_ERR("get gpio bt_wake failed");
+		return -EINVAL;
+	}
+
+	bsi->bt_wake_polarity = (config == OF_GPIO_ACTIVE_LOW) ? 0 : 1;
+	if (assert_level != -1) {
+		bsi->bt_wake_polarity = (assert_level & 0x01) > 0;
+		BT_SLEEP_DBG("override bt_wake polarity to %d", bsi->bt_wake_polarity);
+	}
+
+	BT_SLEEP_DBG("bt_wake polarity: %d", bsi->bt_wake_polarity);
+
+	ret = devm_gpio_request(dev, bsi->ext_wake, "bt_wake");
+	if (ret < 0) {
+		BT_ERR("can't request bt_wake gpio %d",
+			bsi->ext_wake);
+		goto exit;
+	}
+	ret = gpio_direction_output(bsi->ext_wake, bsi->bt_wake_polarity);
+	if (ret < 0) {
+		BT_ERR("can't request output direction bt_wake gpio %d",
+			bsi->ext_wake);
+		goto exit;
+	}
+
+	bsi->host_wake = of_get_named_gpio_flags(np, "bt_hostwake", 0, &config);
+	if (!gpio_is_valid(bsi->host_wake)) {
+		BT_ERR("get gpio bt_hostwake failed");
+		return -EINVAL;
+	}
+
+	bsi->host_wake_polarity = (config == OF_GPIO_ACTIVE_LOW) ? 0 : 1;
+	if (assert_level != -1) {
+		bsi->host_wake_polarity = (assert_level & 0x02) > 0;
+		BT_SLEEP_DBG("override host_wake polarity to %d", bsi->host_wake_polarity);
+	}
+
+	BT_SLEEP_DBG("host_wake polarity: %d", bsi->host_wake_polarity);
+
+	ret = devm_gpio_request(dev, bsi->host_wake, "bt_hostwake");
+	if (ret < 0) {
+		BT_ERR("can't request bt_hostwake gpio %d",
+			bsi->host_wake);
+		goto exit;
+	}
+	ret = gpio_direction_input(bsi->host_wake);
+	if (ret < 0) {
+		BT_ERR("can't request input direction bt_wake gpio %d",
+			bsi->host_wake);
+		goto exit;
+	}
+	if (!of_property_read_bool(np, "wakeup-source")) {
+		BT_SLEEP_DBG("wakeup source is disabled!\n");
+	} else {
+		ret = device_init_wakeup(dev, true);
+		if (ret < 0) {
+			BT_ERR("device init wakeup failed!\n");
+			return ret;
+		}
+		ret = dev_pm_set_wake_irq(dev, gpio_to_irq(bsi->host_wake));
+		if (ret < 0) {
+			BT_ERR("can't enable wakeup src for bt_hostwake %d\n",
+				bsi->host_wake);
+			return ret;
+		}
+		bsi->wakeup_enable = 1;
+	}
+	if (!of_property_read_u32(np, "uart_index", &val)) {
+		BT_SLEEP_DBG("uart_index(%u)", val);
+		bluesleep_uart_dev = sw_uart_get_pdev(val);
+	}
+
+	bsi->ws = wakeup_source_register(dev, "bluesleep");
+
+	//1.set bt_wake as output and the level is 0
+	gpio_set_value(bsi->ext_wake, 0);
+
+	//2.get bt_host_wake gpio irq
+#ifdef AW1732_BT
+	bsi->host_wake_irq = gpio_to_irq(bsi->host_wake);
+	if (bsi->host_wake_irq < 0) {
+		BT_ERR("map gpio [%d] to virq failed, errno = %d\n", bsi->host_wake, bsi->host_wake_irq);
+		ret = -ENODEV;
+		goto free_bt_ext_wake;
+	}
+#endif
+	bsi->pdev = pdev;
+
+	return 0;
+
+#ifdef AW1732_BT
+free_bt_ext_wake:
+	gpio_free(bsi->ext_wake);
+	gpio_free(bsi->host_wake);
+#endif
+
+exit:
+	return ret;
+}
+
+static int bluesleep_remove(struct platform_device *pdev)
+{
+	BT_SLEEP_DBG();
+	/* assert bt wake */
+	gpio_set_value(bsi->ext_wake, bsi->bt_wake_polarity);
+	if (test_bit(BT_PROTO, &flags)) {
+#ifdef AW1732_BT
+		free_irq(bsi->host_wake_irq, &bsi->pdev->dev);
+#endif
+		del_timer(&tx_timer);
+		if (test_bit(BT_ASLEEP, &flags))
+			hsuart_power(1);
+	}
+	gpio_free(bsi->host_wake);
+	gpio_free(bsi->ext_wake);
+	wakeup_source_unregister(bsi->ws);
+	if (bsi->wakeup_enable) {
+		BT_SLEEP_DBG("Deinit wakeup source");
+		device_init_wakeup(&pdev->dev, false);
+		dev_pm_clear_wake_irq(&pdev->dev);
+	}
+
+	return 0;
+}
+
+static int bluesleep_resume(struct platform_device *pdev)
+{
+	BT_SLEEP_DBG();
+	if (!has_lpm_enabled) {
+		return 0;
+	}
+#if 0   //fix bug for always wakeup
+	if (test_bit(BT_ASLEEP, &flags)) {
+		mod_timer(&tx_timer, jiffies + (TX_TIMER_INTERVAL*HZ));
+	}
+	bluesleep_sleep_wakeup();
+#endif
+	return 0;
+}
+
+static int bluesleep_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	BT_SLEEP_DBG();
+	if (!has_lpm_enabled) {
+		return 0;
+	}
+	/*TXing DATA,if suspend will cause a error*/
+	if (test_bit(BT_TXDATA, &flags)) {
+		return -EBUSY;
+	}
+	del_timer(&tx_timer);
+	bluesleep_standby();
+	return 0;
+}
+
+
+static const struct of_device_id sunxi_btlpm_ids[] = {
+	{ .compatible = "allwinner,sunxi-btlpm" },
+	{ /* Sentinel */ }
+};
+
+static struct platform_driver bluesleep_driver = {
+	.probe = bluesleep_probe,
+	.remove = bluesleep_remove,
+	.suspend = bluesleep_suspend,
+	.resume = bluesleep_resume,
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "sunxi-btlpm",
+		.of_match_table	= sunxi_btlpm_ids,
+	},
+};
+
+static int __init btsleep_init(void)
+{
+	int retval;
+	struct proc_dir_entry *ent;
+
+	BT_INFO("XRadio Bluetooth LPM Mode Driver Ver %s", VERSION);
+
+	retval = platform_driver_probe(&bluesleep_driver, bluesleep_probe);
+	if (retval)
+		goto fail;
+
+	bluetooth_dir = proc_mkdir("bluetooth", NULL);
+	if (bluetooth_dir == NULL) {
+		BT_ERR("Unable to create /proc/bluetooth directory");
+		goto unreg_drv;
+	}
+	sleep_dir = proc_mkdir("sleep", bluetooth_dir);
+	if (sleep_dir == NULL) {
+		BT_ERR("Unable to create /proc/%s directory", PROC_SLEEP_DIR);
+		goto rm_bt_dir;
+	}
+
+#ifdef XRADIO_ETF_RFKILL
+	power_dir = proc_mkdir("power", bluetooth_dir);
+	if (power_dir == NULL) {
+		BT_ERR("Unable to create /proc/%s directory", PROC_POWER_DIR);
+		goto rm_bt_dir;
+	}
+	/* read/write proc entries */
+	ent = proc_create("state", 0220, power_dir, &pwr_fops);
+	if (ent == NULL) {
+		BT_ERR("Unable to create /proc/%s/state entry", PROC_POWER_DIR);
+		retval = -ENOMEM;
+		goto rm_power_dir;
+	}
+#endif
+
+	/* read/write proc entries */
+	ent = proc_create("lpm", 0220, sleep_dir, &lpm_fops);
+	if (ent == NULL) {
+		BT_ERR("Unable to create /proc/%s/lpm entry", PROC_SLEEP_DIR);
+		retval = -ENOMEM;
+		goto rm_sleep_dir;
+	}
+	ent = proc_create("btwrite", 0220, sleep_dir, &btwrite_fops);
+	if (ent == NULL) {
+		BT_ERR("Unable to create /proc/%s/btwrite entry", PROC_SLEEP_DIR);
+		retval = -ENOMEM;
+		goto rm_btwrite_dir;
+	}
+	ent = proc_create("btwake", 0220, sleep_dir, &btwake_fops);
+	if (ent == NULL) {
+		BT_ERR("Unable to create /proc/%s/btwrite entry", PROC_SLEEP_DIR);
+		retval = -ENOMEM;
+		goto rm_btwake_dir;
+	}
+
+#ifdef AW1732_BT
+	flags = 0;
+	/* Initialize spinlock. */
+	spin_lock_init(&rw_lock);
+	spin_lock_init(&irq_lock);
+	/* Initialize timer */
+	timer_setup(&tx_timer, bluesleep_tx_timer_expire, 0);
+	/* initialize host wake tasklet */
+	tasklet_init(&hostwake_task, bluesleep_hostwake_task, 0);
+#endif
+
+	return 0;
+
+rm_btwake_dir:
+	remove_proc_entry("btwake", sleep_dir);
+rm_btwrite_dir:
+	remove_proc_entry("btwrite", sleep_dir);
+rm_sleep_dir:
+	remove_proc_entry("sleep", bluetooth_dir);
+#ifdef XRADIO_ETF_RFKILL
+rm_power_dir:
+	remove_proc_entry("state", power_dir);
+	remove_proc_entry("power", bluetooth_dir);
+#endif
+rm_bt_dir:
+	remove_proc_entry("bluetooth", 0);
+unreg_drv:
+	platform_driver_unregister(&bluesleep_driver);
+fail:
+	return retval;
+}
+
+static void __exit btsleep_exit(void)
+{
+	platform_driver_unregister(&bluesleep_driver);
+
+	remove_proc_entry("btwake", sleep_dir);
+	remove_proc_entry("btwrite", sleep_dir);
+	remove_proc_entry("lpm", sleep_dir);
+	remove_proc_entry("sleep", bluetooth_dir);
+#ifdef XRADIO_ETF_RFKILL
+	remove_proc_entry("state", power_dir);
+	remove_proc_entry("power", bluetooth_dir);
+#endif
+	remove_proc_entry("bluetooth", 0);
+}
+
+module_init(btsleep_init);
+module_exit(btsleep_exit);
+MODULE_AUTHOR("XRadioTech");
+MODULE_DESCRIPTION("Bluetooth Sleep Mode Driver ver. %s" VERSION);
+MODULE_LICENSE("GPL");