1 files changed, 387 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/board-omap3h1-bluetooth.c b/arch/arm/mach-omap2/board-omap3h1-bluetooth.c
new file mode 100644
index 00000000000..52bf419b549
--- /dev/null
+++ b/arch/arm/mach-omap2/board-omap3h1-bluetooth.c
@@ -0,0 +1,387 @@
+/*
+ * 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
+ *
+ */
+ 
+ /*
+  * Adapted from board-tuna-bluetooth.c by Evan Wilson <evan@oliodevices.com
+  *
+  */
+ 
+
+#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 <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <asm/mach-types.h>
+#include "serial.h"
+#include "board-omap3h1.h"
+#include <linux/regulator/driver.h>
+
+static void update_host_wake_locked(int);
+
+#define BT_REG_GPIO 180
+
+#define BT_WAKE_GPIO 93
+#define BT_HOST_WAKE_GPIO 11
+
+static struct rfkill *bt_rfkill;
+static struct regulator *clk32ksys_reg;
+static bool bt_enabled;
+static bool host_wake_uart_enabled;
+static bool wake_uart_enabled;
+static struct dentry *btdebugdent;
+
+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 bcm20702_bt_rfkill_set_power(void *data, bool blocked)
+{
+	// rfkill_ops callback. Turn transmitter on when blocked is false
+	if (!blocked) {
+		if (clk32ksys_reg && !bt_enabled)
+			regulator_enable(clk32ksys_reg);
+
+		gpio_set_value(BT_REG_GPIO, 1);
+
+	} else {
+		// Chip won't toggle host_wake after reset.  Make sure
+		// we don't hold the wake_lock until chip wakes up again.
+		update_host_wake_locked(0);
+		
+		gpio_set_value(BT_REG_GPIO, 0);
+		if (clk32ksys_reg && bt_enabled)
+			regulator_disable(clk32ksys_reg);
+	}
+
+	bt_enabled = !blocked;
+
+	return 0;
+}
+
+static const struct rfkill_ops bcm20702_bt_rfkill_ops = {
+	.set_block = bcm20702_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, "bcm20702_wake_gpio");
+	if (unlikely(rc)) {
+		return rc;
+	}
+
+	rc = gpio_request(BT_HOST_WAKE_GPIO, "bcm20702_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 btdebug_dump(struct seq_file *sf, void *private)
+{
+	seq_printf(sf, "en=%d bt_wake=%d lpm.w=%d w_uart_en=%d\n",
+		   bt_enabled, gpio_get_value(BT_WAKE_GPIO),
+		   bt_lpm.wake, wake_uart_enabled);
+	seq_printf(sf, "bt_host_wake=%d lpm.hw=%d hw_uart_en=%d\n",
+		   gpio_get_value(BT_HOST_WAKE_GPIO), bt_lpm.host_wake,
+		   host_wake_uart_enabled);
+	return 0;
+}
+
+static int btdebug_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, btdebug_dump, NULL);
+}
+
+static const struct file_operations btdebug_fops = {
+	.open = btdebug_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+};
+
+static int bcm20702_bluetooth_probe(struct platform_device *pdev)
+{
+	int rc = 0;
+	int ret = 0;
+
+//	rc = gpio_request(BT_RESET_GPIO, "bcm20702_nreset_gpip");
+//	if (unlikely(rc)) {
+//		return rc;
+//	}
+
+	rc = gpio_request(BT_REG_GPIO, "bcm20702_nshutdown_gpio");
+	if (unlikely(rc)) {
+		//gpio_free(BT_RESET_GPIO);
+		return rc;
+	}
+
+	clk32ksys_reg = regulator_get(0, "clk32ksys");
+	if (IS_ERR(clk32ksys_reg)) {
+		pr_err("clk32ksys reg not found!\n");
+		clk32ksys_reg = NULL;
+	}
+
+	gpio_direction_output(BT_REG_GPIO, 1);
+	//gpio_direction_output(BT_RESET_GPIO, 1);
+
+	bt_rfkill = rfkill_alloc("bcm20702 Bluetooth", &pdev->dev,
+				RFKILL_TYPE_BLUETOOTH, &bcm20702_bt_rfkill_ops,
+				NULL);
+
+	if (unlikely(!bt_rfkill)) {
+		//gpio_free(BT_RESET_GPIO);
+		gpio_free(BT_REG_GPIO);
+		return -ENOMEM;
+	}
+
+	rfkill_set_states(bt_rfkill, true, false);
+	rc = rfkill_register(bt_rfkill);
+
+	if (unlikely(rc)) {
+		rfkill_destroy(bt_rfkill);
+		//gpio_free(BT_RESET_GPIO);
+		gpio_free(BT_REG_GPIO);
+		return -1;
+	}
+
+	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);
+	}
+
+	btdebugdent = debugfs_create_file("bt", S_IRUGO, NULL, NULL,
+					  &btdebug_fops);
+	if (IS_ERR_OR_NULL(btdebugdent))
+		pr_err("%s: failed to create debugfs file\n", __func__);
+
+	return ret;
+}
+
+static int bcm20702_bluetooth_remove(struct platform_device *pdev)
+{
+	rfkill_unregister(bt_rfkill);
+	rfkill_destroy(bt_rfkill);
+
+	if (!IS_ERR_OR_NULL(btdebugdent))
+		debugfs_remove(btdebugdent);
+
+	gpio_free(BT_REG_GPIO);
+	//gpio_free(BT_RESET_GPIO);
+	gpio_free(BT_WAKE_GPIO);
+	gpio_free(BT_HOST_WAKE_GPIO);
+	regulator_put(clk32ksys_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 bcm20702_bluetooth_platform_driver = {
+	.probe = bcm20702_bluetooth_probe,
+	.remove = bcm20702_bluetooth_remove,
+	.suspend = bcm4430_bluetooth_suspend,
+	.resume = bcm4430_bluetooth_resume,
+	.driver = {
+		   .name = "bcm20702_bluetooth",
+		   .owner = THIS_MODULE,
+		   },
+};
+
+static int __init bcm20702_bluetooth_init(void)
+{
+	bt_enabled = false;
+	return platform_driver_register(&bcm20702_bluetooth_platform_driver);
+}
+
+static void __exit bcm20702_bluetooth_exit(void)
+{
+	platform_driver_unregister(&bcm20702_bluetooth_platform_driver);
+}
+
+
+module_init(bcm20702_bluetooth_init);
+module_exit(bcm20702_bluetooth_exit);
+
+MODULE_ALIAS("platform:bcm20702");
+MODULE_DESCRIPTION("bcm20702_bluetooth");
+MODULE_AUTHOR("Jaikumar Ganesh <jaikumar@google.com>");
+MODULE_LICENSE("GPL");