1 files changed, 371 insertions, 0 deletions

diff --git a/drivers/bluetooth/ti_bluesleep.c b/drivers/bluetooth/ti_bluesleep.c
new file mode 100644
index 00000000000..d86fd261e67
--- /dev/null
+++ b/drivers/bluetooth/ti_bluesleep.c
@@ -0,0 +1,371 @@
+/*
+ *  TI Bluesleep driver
+ *      Kernel module responsible for Wake up of Host
+ *  Copyright (C) 2009-2010 Texas Instruments
+
+
+ * 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) 2008-2009, Code Aurora Forum. 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 <linux/tegra_uart.h>
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h> /* event notifications */
+#include "hci_uart.h"
+
+/*
+ * Defines
+ */
+
+#define VERSION  "1.1"
+
+#define POLARITY_LOW 0
+#define POLARITY_HIGH 1
+
+struct bluesleep_info {
+        unsigned host_wake_irq;
+        struct uart_port *uport;
+        struct wake_lock wake_lock;
+        int irq_polarity;
+        int has_ext_wake;
+};
+
+
+/* state variable names and bit positions */
+#define FLAG_RESET              0x00
+#define BT_ACTIVE               0x02
+#define BT_SUSPEND              0x04
+
+
+/* work function */
+static void hostwake_sleep_work(struct work_struct *work);
+
+/* work queue */
+DECLARE_DELAYED_WORK(ti_sleep_workqueue, hostwake_sleep_work);
+
+/* Macros for handling sleep work */
+#define hostwake_workqueue()     schedule_delayed_work(&ti_sleep_workqueue, 0)
+
+static struct bluesleep_info *bsi;
+
+/* module usage */
+static atomic_t open_count = ATOMIC_INIT(1);
+
+/*
+ * Global variables
+ */
+/** Global state flags */
+static unsigned long flags;
+
+/** Tasklet to respond to change in hostwake line */
+static struct tasklet_struct hostwake_task;
+
+/** Lock for state transitions */
+static spinlock_t rw_lock;
+
+/*
+ * Local functions
+ */
+static void hsuart_power(int on)
+{
+        pr_debug("%s", __func__);
+
+        if (on) {
+                tegra_uart_request_clock_on(bsi->uport);
+                tegra_uart_set_mctrl(bsi->uport, TIOCM_RTS);
+        } else {
+                tegra_uart_set_mctrl(bsi->uport, 0);
+                tegra_uart_request_clock_off(bsi->uport);
+        }
+}
+
+
+
+/**
+ * @brief@  main sleep work handling function which update the flags
+ * and activate and deactivate UART .
+ */
+
+static void hostwake_sleep_work(struct work_struct *work)
+{
+        pr_debug("%s", __func__);
+        free_irq(bsi->host_wake_irq, "tibluesleep");
+        /*Activating UART */
+        if (test_bit(BT_SUSPEND, &flags)) {
+                BT_DBG("Activate UART");
+                hsuart_power(1);
+
+        }
+        bsi->has_ext_wake = 0;
+        clear_bit(BT_SUSPEND, &flags);
+        set_bit(BT_ACTIVE, &flags);
+
+}
+
+
+/**
+ * A tasklet function that runs in tasklet context
+ * @param data Not used.
+ */
+static void bluesleep_hostwake_task(unsigned long data)
+{
+        pr_debug("%s", __func__);
+        disable_irq(bsi->host_wake_irq);
+        spin_lock(&rw_lock);
+        hostwake_workqueue();
+        spin_unlock(&rw_lock);
+}
+
+
+/**
+ * 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)
+{
+
+        pr_debug("%s", __func__);
+        /* schedule a tasklet to handle the change in the host wake line */
+        bsi->has_ext_wake = 1;
+        tasklet_schedule(&hostwake_task);
+        return IRQ_HANDLED;
+}
+
+/**
+ * Starts the Sleep-Mode Protocol on the Host.
+ * @return On success, 0. On error, -1, and <code>errno</code> is set
+ * appropriately.
+ */
+
+  int bluesleep_start(struct uart_port *uport)
+{
+        int retval;
+        bsi->uport = uport;
+        pr_debug("%s", __func__);
+
+        if (test_bit(BT_SUSPEND, &flags)) {
+                BT_DBG("bluesleep_acquire irq");
+                if (bsi->irq_polarity == POLARITY_LOW) {
+                        retval = request_irq(bsi->host_wake_irq, bluesleep_hostwake_isr,
+                                        IRQF_DISABLED | IRQF_TRIGGER_FALLING,
+                                        "bluetooth hostwake", "tibluesleep");
+                } else  {
+                        retval = request_irq(bsi->host_wake_irq, bluesleep_hostwake_isr,
+                                        IRQF_DISABLED | IRQF_TRIGGER_RISING,
+                                        "bluetooth hostwake", "tibluesleep");
+                }
+                if (retval  < 0) {
+                        BT_ERR("Couldn't acquire BT_HOST_WAKE IRQ");
+                        goto fail;
+                }
+
+                retval = enable_irq_wake(bsi->host_wake_irq);
+                if (retval < 0) {
+                        BT_ERR("Couldn't enable BT_HOST_WAKE as wakeup"
+                                        "interrupt retval %d\n", retval);
+                        free_irq(bsi->host_wake_irq, NULL);
+                        goto fail;
+                }
+        }
+
+        return 0;
+fail:
+        atomic_inc(&open_count);
+        return retval;
+}
+
+/**
+ * Stops the Sleep-Mode Protocol on the Host.
+ */
+  void bluesleep_stop(void)
+{
+
+        pr_debug("%s", __func__);
+
+        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);
+}
+
+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_IRQ,
+                                                "host_wake");
+        if (!res) {
+                BT_ERR("couldn't find host_wake irq\n");
+                ret = -ENODEV;
+                goto free_bsi;
+        }
+
+        bsi->host_wake_irq = res->start;
+
+        if (bsi->host_wake_irq < 0) {
+                BT_ERR("couldn't find host_wake irq");
+                ret = -ENODEV;
+                goto free_bsi;
+        }
+        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);
+        set_bit(BT_ACTIVE, &flags);
+
+        return 0;
+
+free_bsi:
+        kfree(bsi);
+        return ret;
+}
+
+static int bluesleep_remove(struct platform_device *pdev)
+{
+        pr_debug("%s", __func__);
+        kfree(bsi);
+        return 0;
+}
+
+
+static int bluesleep_resume(struct platform_device *pdev)
+{
+
+        pr_debug("%s", __func__);
+        if (test_bit(BT_SUSPEND, &flags)) {
+
+                if ((bsi->uport != NULL) && (bsi->has_ext_wake)) {
+                        tegra_uart_request_clock_on(bsi->uport);
+                        tegra_uart_set_mctrl(bsi->uport, TIOCM_RTS);
+                }
+                clear_bit(BT_SUSPEND, &flags);
+                set_bit(BT_ACTIVE, &flags);
+        }
+
+        return 0;
+}
+
+static int bluesleep_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        pr_debug("%s", __func__);
+        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 = "tibluesleep",
+                .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;
+
+        BT_INFO("BlueSleep Mode Driver Ver %s", VERSION);
+
+        retval = platform_driver_register(&bluesleep_driver);
+        if (retval)
+                goto fail;
+
+        if (bsi == NULL)
+                return 0;
+
+        flags = FLAG_RESET; /* clear all status bits */
+
+        /* Initialize spinlock. */
+        spin_lock_init(&rw_lock);
+
+        /* initialize host wake tasklet */
+        tasklet_init(&hostwake_task, bluesleep_hostwake_task, 0);
+
+        return 0;
+fail:
+        return retval;
+}
+
+/**
+ * Cleans up the module.
+ */
+
+static void __exit bluesleep_exit(void)
+{
+        if (bsi == NULL)
+                return;
+        /* assert bt wake */
+        free_irq(bsi->host_wake_irq, NULL);
+        platform_driver_unregister(&bluesleep_driver);
+
+}
+
+module_init(bluesleep_init);
+module_exit(bluesleep_exit);
+
+MODULE_DESCRIPTION("TI Bluetooth Sleep Mode Driver ver %s " VERSION);
+#ifdef MODULE_LICENSE
+MODULE_LICENSE("GPL");
+#endif