arch/arm/mach-omap2/board-tuna-bluetooth.c - kernel/omap - Git at Google

 /*
  * Bluetooth Broadcomm  and low power control via GPIO
  *
  *  Copyright (C) 2011 Google, Inc.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  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/init.h>
 #include <linux/gpio.h>
 #include <linux/hrtimer.h>
 #include <linux/irq.h>
 #include <linux/rfkill.h>
 #include <linux/platform_device.h>
 #include <linux/wakelock.h>
 #include <asm/mach-types.h>
 #include <plat/serial.h>
 #include <plat/board-tuna-bluetooth.h>
 #include <linux/regulator/driver.h>

 #define BT_REG_GPIO 103
 #define BT_RESET_GPIO 42

 #define BT_WAKE_GPIO 27
 #define BT_HOST_WAKE_GPIO 177

 static struct rfkill *bt_rfkill;
 static struct regulator *clk32kaudio_reg;
 static bool bt_enabled;
 static bool host_wake_uart_enabled;
 static bool wake_uart_enabled;

 struct bcm_bt_lpm {
 	int wake;
 	int host_wake;

 	struct hrtimer enter_lpm_timer;
 	ktime_t enter_lpm_delay;

 	struct uart_port *uport;

 	struct wake_lock wake_lock;
 	char wake_lock_name[100];
 } bt_lpm;

 static int bcm4330_bt_rfkill_set_power(void *data, bool blocked)
 {
 	// rfkill_ops callback. Turn transmitter on when blocked is false
 	if (!blocked) {
 		if (clk32kaudio_reg && !bt_enabled)
 			regulator_enable(clk32kaudio_reg);

 		gpio_set_value(BT_REG_GPIO, 1);
 		gpio_set_value(BT_RESET_GPIO, 1);

 	} else {
 		gpio_set_value(BT_RESET_GPIO, 0);
 		gpio_set_value(BT_REG_GPIO, 0);
 		if (clk32kaudio_reg && bt_enabled)
 			regulator_disable(clk32kaudio_reg);
 	}

 	bt_enabled = !blocked;

 	return 0;
 }

 static const struct rfkill_ops bcm4330_bt_rfkill_ops = {
 	.set_block = bcm4330_bt_rfkill_set_power,
 };

 static void set_wake_locked(int wake)
 {
 	bt_lpm.wake = wake;

 	if (!wake)
 		wake_unlock(&bt_lpm.wake_lock);

 	if (!wake_uart_enabled && wake)
 		omap_uart_enable(2);

 	gpio_set_value(BT_WAKE_GPIO, wake);

 	if (wake_uart_enabled && !wake)
 		omap_uart_disable(2);

 	wake_uart_enabled = wake;
 }

 static enum hrtimer_restart enter_lpm(struct hrtimer *timer) {
 	unsigned long flags;
 	spin_lock_irqsave(&bt_lpm.uport->lock, flags);
 	set_wake_locked(0);
 	spin_unlock_irqrestore(&bt_lpm.uport->lock, flags);

 	return HRTIMER_NORESTART;
 }

 void bcm_bt_lpm_exit_lpm_locked(struct uart_port *uport) {
 	bt_lpm.uport = uport;

 	hrtimer_try_to_cancel(&bt_lpm.enter_lpm_timer);

 	set_wake_locked(1);

 	hrtimer_start(&bt_lpm.enter_lpm_timer, bt_lpm.enter_lpm_delay,
 		HRTIMER_MODE_REL);
 }
 EXPORT_SYMBOL(bcm_bt_lpm_exit_lpm_locked);

 static void update_host_wake_locked(int host_wake)
 {
 	if (host_wake == bt_lpm.host_wake)
 		return;

 	bt_lpm.host_wake = host_wake;

 	if (host_wake) {
 		wake_lock(&bt_lpm.wake_lock);
 		if (!host_wake_uart_enabled)
 			omap_uart_enable(2);
 	} else  {
 		if (host_wake_uart_enabled)
 			omap_uart_disable(2);
 		// Take a timed wakelock, so that upper layers can take it.
 		// The chipset deasserts the hostwake lock, when there is no
 		// more data to send.
 		wake_lock_timeout(&bt_lpm.wake_lock, HZ/2);
 	}

 	host_wake_uart_enabled = host_wake;

 }

 static irqreturn_t host_wake_isr(int irq, void *dev)
 {
 	int host_wake;
 	unsigned long flags;

 	host_wake = gpio_get_value(BT_HOST_WAKE_GPIO);
 	irq_set_irq_type(irq, host_wake ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH);

 	if (!bt_lpm.uport) {
 		bt_lpm.host_wake = host_wake;
 		return IRQ_HANDLED;
 	}

 	spin_lock_irqsave(&bt_lpm.uport->lock, flags);
 	update_host_wake_locked(host_wake);
 	spin_unlock_irqrestore(&bt_lpm.uport->lock, flags);

 	return IRQ_HANDLED;
 }

 static int bcm_bt_lpm_init(struct platform_device *pdev)
 {
 	int irq;
 	int ret;
 	int rc;

 	rc = gpio_request(BT_WAKE_GPIO, "bcm4330_wake_gpio");
 	if (unlikely(rc)) {
 		return rc;
 	}

 	rc = gpio_request(BT_HOST_WAKE_GPIO, "bcm4330_host_wake_gpio");
 	if (unlikely(rc)) {
 		gpio_free(BT_WAKE_GPIO);
 		return rc;
 	}

 	hrtimer_init(&bt_lpm.enter_lpm_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
 	bt_lpm.enter_lpm_delay = ktime_set(1, 0);  /* 1 sec */
 	bt_lpm.enter_lpm_timer.function = enter_lpm;

 	bt_lpm.host_wake = 0;

 	irq = gpio_to_irq(BT_HOST_WAKE_GPIO);
 	ret = request_irq(irq, host_wake_isr, IRQF_TRIGGER_HIGH,
 		"bt host_wake", NULL);
 	if (ret) {
 		gpio_free(BT_WAKE_GPIO);
 		gpio_free(BT_HOST_WAKE_GPIO);
 		return ret;
 	}

 	ret = irq_set_irq_wake(irq, 1);
 	if (ret) {
 		gpio_free(BT_WAKE_GPIO);
 		gpio_free(BT_HOST_WAKE_GPIO);
 		return ret;
 	}

 	gpio_direction_output(BT_WAKE_GPIO, 0);
 	gpio_direction_input(BT_HOST_WAKE_GPIO);

 	snprintf(bt_lpm.wake_lock_name, sizeof(bt_lpm.wake_lock_name),
 			"BTLowPower");
 	wake_lock_init(&bt_lpm.wake_lock, WAKE_LOCK_SUSPEND,
 			 bt_lpm.wake_lock_name);
 	return 0;
 }

 static int bcm4330_bluetooth_probe(struct platform_device *pdev)
 {
 	int rc = 0;
 	int ret = 0;

 	rc = gpio_request(BT_RESET_GPIO, "bcm4330_nreset_gpip");
 	if (unlikely(rc)) {
 		return rc;
 	}

 	rc = gpio_request(BT_REG_GPIO, "bcm4330_nshutdown_gpio");
 	if (unlikely(rc)) {
 		gpio_free(BT_RESET_GPIO);
 		return rc;
 	}

 	clk32kaudio_reg = regulator_get(0, "clk32kaudio");
 	if (IS_ERR(clk32kaudio_reg)) {
 		pr_err("clk32kaudio reg not found!\n");
 		clk32kaudio_reg = NULL;
 	}

 	gpio_direction_output(BT_REG_GPIO, 1);
 	gpio_direction_output(BT_RESET_GPIO, 1);

 	bt_rfkill = rfkill_alloc("bcm4330 Bluetooth", &pdev->dev,
 				RFKILL_TYPE_BLUETOOTH, &bcm4330_bt_rfkill_ops,
 				NULL);

 	if (unlikely(!bt_rfkill)) {
 		gpio_free(BT_RESET_GPIO);
 		gpio_free(BT_REG_GPIO);
 		return -ENOMEM;
 	}

 	rc = rfkill_register(bt_rfkill);

 	if (unlikely(rc)) {
 		rfkill_destroy(bt_rfkill);
 		gpio_free(BT_RESET_GPIO);
 		gpio_free(BT_REG_GPIO);
 		return -1;
 	}

 	rfkill_set_states(bt_rfkill, true, false);
 	bcm4330_bt_rfkill_set_power(NULL, true);

 	ret = bcm_bt_lpm_init(pdev);
 	if (ret) {
 		rfkill_unregister(bt_rfkill);
 		rfkill_destroy(bt_rfkill);

 		gpio_free(BT_RESET_GPIO);
 		gpio_free(BT_REG_GPIO);
 	}

 	return ret;
 }

 static int bcm4330_bluetooth_remove(struct platform_device *pdev)
 {
 	rfkill_unregister(bt_rfkill);
 	rfkill_destroy(bt_rfkill);

 	gpio_free(BT_REG_GPIO);
 	gpio_free(BT_RESET_GPIO);
 	gpio_free(BT_WAKE_GPIO);
 	gpio_free(BT_HOST_WAKE_GPIO);
 	regulator_put(clk32kaudio_reg);

 	wake_lock_destroy(&bt_lpm.wake_lock);
 	return 0;
 }

 int bcm4430_bluetooth_suspend(struct platform_device *pdev, pm_message_t state)
 {
 	int irq = gpio_to_irq(BT_HOST_WAKE_GPIO);
 	int host_wake;

 	disable_irq(irq);
 	host_wake = gpio_get_value(BT_HOST_WAKE_GPIO);

 	if (host_wake) {
 		enable_irq(irq);
 		return -EBUSY;
 	}

 	return 0;
 }

 int bcm4430_bluetooth_resume(struct platform_device *pdev)
 {
 	int irq = gpio_to_irq(BT_HOST_WAKE_GPIO);
 	enable_irq(irq);
 	return 0;
 }

 static struct platform_driver bcm4330_bluetooth_platform_driver = {
 	.probe = bcm4330_bluetooth_probe,
 	.remove = bcm4330_bluetooth_remove,
 	.suspend = bcm4430_bluetooth_suspend,
 	.resume = bcm4430_bluetooth_resume,
 	.driver = {
 		   .name = "bcm4330_bluetooth",
 		   .owner = THIS_MODULE,
 		   },
 };

 static int __init bcm4330_bluetooth_init(void)
 {
 	bt_enabled = false;
 	return platform_driver_register(&bcm4330_bluetooth_platform_driver);
 }

 static void __exit bcm4330_bluetooth_exit(void)
 {
 	platform_driver_unregister(&bcm4330_bluetooth_platform_driver);
 }


 module_init(bcm4330_bluetooth_init);
 module_exit(bcm4330_bluetooth_exit);

 MODULE_ALIAS("platform:bcm4330");
 MODULE_DESCRIPTION("bcm4330_bluetooth");
 MODULE_AUTHOR("Jaikumar Ganesh <[email protected]>");
 MODULE_LICENSE("GPL");
	/*
	* Bluetooth Broadcomm and low power control via GPIO
	*
	* Copyright (C) 2011 Google, Inc.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* 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/init.h>
	#include <linux/gpio.h>
	#include <linux/hrtimer.h>
	#include <linux/irq.h>
	#include <linux/rfkill.h>
	#include <linux/platform_device.h>
	#include <linux/wakelock.h>
	#include <asm/mach-types.h>
	#include <plat/serial.h>
	#include <plat/board-tuna-bluetooth.h>
	#include <linux/regulator/driver.h>

	#define BT_REG_GPIO 103
	#define BT_RESET_GPIO 42

	#define BT_WAKE_GPIO 27
	#define BT_HOST_WAKE_GPIO 177

	static struct rfkill *bt_rfkill;
	static struct regulator *clk32kaudio_reg;
	static bool bt_enabled;
	static bool host_wake_uart_enabled;
	static bool wake_uart_enabled;

	struct bcm_bt_lpm {
	int wake;
	int host_wake;

	struct hrtimer enter_lpm_timer;
	ktime_t enter_lpm_delay;

	struct uart_port *uport;

	struct wake_lock wake_lock;
	char wake_lock_name[100];
	} bt_lpm;

	static int bcm4330_bt_rfkill_set_power(void *data, bool blocked)
	{
	// rfkill_ops callback. Turn transmitter on when blocked is false
	if (!blocked) {
	if (clk32kaudio_reg && !bt_enabled)
	regulator_enable(clk32kaudio_reg);

	gpio_set_value(BT_REG_GPIO, 1);
	gpio_set_value(BT_RESET_GPIO, 1);

	} else {
	gpio_set_value(BT_RESET_GPIO, 0);
	gpio_set_value(BT_REG_GPIO, 0);
	if (clk32kaudio_reg && bt_enabled)
	regulator_disable(clk32kaudio_reg);
	}

	bt_enabled = !blocked;

	return 0;
	}

	static const struct rfkill_ops bcm4330_bt_rfkill_ops = {
	.set_block = bcm4330_bt_rfkill_set_power,
	};

	static void set_wake_locked(int wake)
	{
	bt_lpm.wake = wake;

	if (!wake)
	wake_unlock(&bt_lpm.wake_lock);

	if (!wake_uart_enabled && wake)
	omap_uart_enable(2);

	gpio_set_value(BT_WAKE_GPIO, wake);

	if (wake_uart_enabled && !wake)
	omap_uart_disable(2);

	wake_uart_enabled = wake;
	}

	static enum hrtimer_restart enter_lpm(struct hrtimer *timer) {
	unsigned long flags;
	spin_lock_irqsave(&bt_lpm.uport->lock, flags);
	set_wake_locked(0);
	spin_unlock_irqrestore(&bt_lpm.uport->lock, flags);

	return HRTIMER_NORESTART;
	}

	void bcm_bt_lpm_exit_lpm_locked(struct uart_port *uport) {
	bt_lpm.uport = uport;

	hrtimer_try_to_cancel(&bt_lpm.enter_lpm_timer);

	set_wake_locked(1);

	hrtimer_start(&bt_lpm.enter_lpm_timer, bt_lpm.enter_lpm_delay,
	HRTIMER_MODE_REL);
	}
	EXPORT_SYMBOL(bcm_bt_lpm_exit_lpm_locked);

	static void update_host_wake_locked(int host_wake)
	{
	if (host_wake == bt_lpm.host_wake)
	return;

	bt_lpm.host_wake = host_wake;

	if (host_wake) {
	wake_lock(&bt_lpm.wake_lock);
	if (!host_wake_uart_enabled)
	omap_uart_enable(2);
	} else {
	if (host_wake_uart_enabled)
	omap_uart_disable(2);
	// Take a timed wakelock, so that upper layers can take it.
	// The chipset deasserts the hostwake lock, when there is no
	// more data to send.
	wake_lock_timeout(&bt_lpm.wake_lock, HZ/2);
	}

	host_wake_uart_enabled = host_wake;

	}

	static irqreturn_t host_wake_isr(int irq, void *dev)
	{
	int host_wake;
	unsigned long flags;

	host_wake = gpio_get_value(BT_HOST_WAKE_GPIO);
	irq_set_irq_type(irq, host_wake ? IRQF_TRIGGER_LOW : IRQF_TRIGGER_HIGH);

	if (!bt_lpm.uport) {
	bt_lpm.host_wake = host_wake;
	return IRQ_HANDLED;
	}

	spin_lock_irqsave(&bt_lpm.uport->lock, flags);
	update_host_wake_locked(host_wake);
	spin_unlock_irqrestore(&bt_lpm.uport->lock, flags);

	return IRQ_HANDLED;
	}

	static int bcm_bt_lpm_init(struct platform_device *pdev)
	{
	int irq;
	int ret;
	int rc;

	rc = gpio_request(BT_WAKE_GPIO, "bcm4330_wake_gpio");
	if (unlikely(rc)) {
	return rc;
	}

	rc = gpio_request(BT_HOST_WAKE_GPIO, "bcm4330_host_wake_gpio");
	if (unlikely(rc)) {
	gpio_free(BT_WAKE_GPIO);
	return rc;
	}

	hrtimer_init(&bt_lpm.enter_lpm_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
	bt_lpm.enter_lpm_delay = ktime_set(1, 0); /* 1 sec */
	bt_lpm.enter_lpm_timer.function = enter_lpm;

	bt_lpm.host_wake = 0;

	irq = gpio_to_irq(BT_HOST_WAKE_GPIO);
	ret = request_irq(irq, host_wake_isr, IRQF_TRIGGER_HIGH,
	"bt host_wake", NULL);
	if (ret) {
	gpio_free(BT_WAKE_GPIO);
	gpio_free(BT_HOST_WAKE_GPIO);
	return ret;
	}

	ret = irq_set_irq_wake(irq, 1);
	if (ret) {
	gpio_free(BT_WAKE_GPIO);
	gpio_free(BT_HOST_WAKE_GPIO);
	return ret;
	}

	gpio_direction_output(BT_WAKE_GPIO, 0);
	gpio_direction_input(BT_HOST_WAKE_GPIO);

	snprintf(bt_lpm.wake_lock_name, sizeof(bt_lpm.wake_lock_name),
	"BTLowPower");
	wake_lock_init(&bt_lpm.wake_lock, WAKE_LOCK_SUSPEND,
	bt_lpm.wake_lock_name);
	return 0;
	}

	static int bcm4330_bluetooth_probe(struct platform_device *pdev)
	{
	int rc = 0;
	int ret = 0;

	rc = gpio_request(BT_RESET_GPIO, "bcm4330_nreset_gpip");
	if (unlikely(rc)) {
	return rc;
	}

	rc = gpio_request(BT_REG_GPIO, "bcm4330_nshutdown_gpio");
	if (unlikely(rc)) {
	gpio_free(BT_RESET_GPIO);
	return rc;
	}

	clk32kaudio_reg = regulator_get(0, "clk32kaudio");
	if (IS_ERR(clk32kaudio_reg)) {
	pr_err("clk32kaudio reg not found!\n");
	clk32kaudio_reg = NULL;
	}

	gpio_direction_output(BT_REG_GPIO, 1);
	gpio_direction_output(BT_RESET_GPIO, 1);

	bt_rfkill = rfkill_alloc("bcm4330 Bluetooth", &pdev->dev,
	RFKILL_TYPE_BLUETOOTH, &bcm4330_bt_rfkill_ops,
	NULL);

	if (unlikely(!bt_rfkill)) {
	gpio_free(BT_RESET_GPIO);
	gpio_free(BT_REG_GPIO);
	return -ENOMEM;
	}

	rc = rfkill_register(bt_rfkill);

	if (unlikely(rc)) {
	rfkill_destroy(bt_rfkill);
	gpio_free(BT_RESET_GPIO);
	gpio_free(BT_REG_GPIO);
	return -1;
	}

	rfkill_set_states(bt_rfkill, true, false);
	bcm4330_bt_rfkill_set_power(NULL, true);

	ret = bcm_bt_lpm_init(pdev);
	if (ret) {
	rfkill_unregister(bt_rfkill);
	rfkill_destroy(bt_rfkill);

	gpio_free(BT_RESET_GPIO);
	gpio_free(BT_REG_GPIO);
	}

	return ret;
	}

	static int bcm4330_bluetooth_remove(struct platform_device *pdev)
	{
	rfkill_unregister(bt_rfkill);
	rfkill_destroy(bt_rfkill);

	gpio_free(BT_REG_GPIO);
	gpio_free(BT_RESET_GPIO);
	gpio_free(BT_WAKE_GPIO);
	gpio_free(BT_HOST_WAKE_GPIO);
	regulator_put(clk32kaudio_reg);

	wake_lock_destroy(&bt_lpm.wake_lock);
	return 0;
	}

	int bcm4430_bluetooth_suspend(struct platform_device *pdev, pm_message_t state)
	{
	int irq = gpio_to_irq(BT_HOST_WAKE_GPIO);
	int host_wake;

	disable_irq(irq);
	host_wake = gpio_get_value(BT_HOST_WAKE_GPIO);

	if (host_wake) {
	enable_irq(irq);
	return -EBUSY;
	}

	return 0;
	}

	int bcm4430_bluetooth_resume(struct platform_device *pdev)
	{
	int irq = gpio_to_irq(BT_HOST_WAKE_GPIO);
	enable_irq(irq);
	return 0;
	}

	static struct platform_driver bcm4330_bluetooth_platform_driver = {
	.probe = bcm4330_bluetooth_probe,
	.remove = bcm4330_bluetooth_remove,
	.suspend = bcm4430_bluetooth_suspend,
	.resume = bcm4430_bluetooth_resume,
	.driver = {
	.name = "bcm4330_bluetooth",
	.owner = THIS_MODULE,
	},
	};

	static int __init bcm4330_bluetooth_init(void)
	{
	bt_enabled = false;
	return platform_driver_register(&bcm4330_bluetooth_platform_driver);
	}

	static void __exit bcm4330_bluetooth_exit(void)
	{
	platform_driver_unregister(&bcm4330_bluetooth_platform_driver);
	}


	module_init(bcm4330_bluetooth_init);
	module_exit(bcm4330_bluetooth_exit);

	MODULE_ALIAS("platform:bcm4330");
	MODULE_DESCRIPTION("bcm4330_bluetooth");
	MODULE_AUTHOR("Jaikumar Ganesh <[email protected]>");
	MODULE_LICENSE("GPL");