/*
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* TI Bluesleep driver
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* Kernel module responsible for Wake up of Host
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* Copyright (C) 2009-2010 Texas Instruments
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|
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* Copyright (C) 2006-2007 - Motorola
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* Copyright (c) 2008-2009, Code Aurora Forum. All rights reserved.
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*
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* Date Author Comment
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* ----------- -------------- --------------------------------
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* 2006-Apr-28 Motorola The kernel module for running the Bluetooth(R)
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* Sleep-Mode Protocol from the Host side
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* 2006-Sep-08 Motorola Added workqueue for handling sleep work.
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* 2007-Jan-24 Motorola Added mbm_handle_ioi() call to ISR.
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* 2009-Aug-10 Motorola Changed "add_timer" to "mod_timer" to solve
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* race when flurry of queued work comes in.
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*/
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#define DEBUG
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#include <linux/module.h> /* kernel module definitions */
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/serial_core.h>
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#include <linux/proc_fs.h>
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#include <linux/wakelock.h>
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#include <linux/gpio.h>
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#include <linux/sunxi-gpio.h>
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#include <linux/of_gpio.h>
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#include <linux/pm_wakeirq.h>
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#include <net/bluetooth/bluetooth.h>
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#include "../tty/serial/sunxi-uart.h"
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/*
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* #define BT_SLEEP_DBG
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*/
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#undef BT_DBG
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#undef BT_ERR
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#ifdef BT_SLEEP_DBG
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#define BT_DBG(fmt, arg...) pr_debug("[BT_LPM] %s: " fmt "\n",\
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__func__, ## arg)
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#else
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#define BT_DBG(fmt, arg...)
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#endif
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#define BT_ERR(fmt, arg...) pr_err("[BT_LPM] %s: " fmt "\n",\
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__func__, ## arg)
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/*
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* Defines
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*/
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#define VERSION "1.2"
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#define PROC_DIR "bluetooth/sleep"
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#define DEFAULT_UART_INDEX 1
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|
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static void bluesleep_stop(void);
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static int bluesleep_start(void);
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struct bluesleep_info {
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unsigned int wakeup_enable;
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unsigned host_wake;
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unsigned ext_wake;
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unsigned host_wake_irq;
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struct wake_lock wake_lock;
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struct uart_port *uport;
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unsigned host_wake_assert:1;
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unsigned ext_wake_assert:1;
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};
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/* work function */
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static void bluesleep_sleep_work(struct work_struct *work);
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/* work queue */
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DECLARE_DELAYED_WORK(sleep_workqueue, bluesleep_sleep_work);
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/* Macros for handling sleep work */
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#define bluesleep_rx_busy() schedule_delayed_work(&sleep_workqueue, 0)
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#define bluesleep_tx_busy() schedule_delayed_work(&sleep_workqueue, 0)
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#define bluesleep_rx_idle() schedule_delayed_work(&sleep_workqueue, 0)
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#define bluesleep_tx_idle() schedule_delayed_work(&sleep_workqueue, 0)
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/* 10 second timeout */
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#define TX_TIMER_INTERVAL 10
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/* state variable names and bit positions */
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#define BT_PROTO 0x01
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#define BT_TXDATA 0x02
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#define BT_ASLEEP 0x04
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/* variable use indicate lpm modle */
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static bool has_lpm_enabled;
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/* struct use save platform_device from uart */
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static struct platform_device *bluesleep_uart_dev;
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static struct bluesleep_info *bsi;
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/* module usage */
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static atomic_t open_count = ATOMIC_INIT(1);
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/*
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* Global variables
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*/
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/** Global state flags */
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static unsigned long flags;
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/** Tasklet to respond to change in hostwake line */
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static struct tasklet_struct hostwake_task;
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/** Transmission timer */
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static struct timer_list tx_timer;
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/** Lock for state transitions */
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static spinlock_t rw_lock;
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struct proc_dir_entry *bluetooth_dir, *sleep_dir;
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/*
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* Local functions
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*/
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/**
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* @return 1 if the Host can go to sleep, 0 otherwise.
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*/
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static inline int bluesleep_can_sleep(void)
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{
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/* check if BT_WAKE_HOST_GPIO deasserted */
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return (gpio_get_value(bsi->host_wake) != bsi->host_wake_assert) &&
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(bsi->uport != NULL);
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}
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/*
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* after bt wakeup should clean BT_ASLEEP flag and start time.
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*/
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void bluesleep_sleep_wakeup(void)
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{
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if (test_bit(BT_ASLEEP, &flags)) {
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BT_DBG("waking up...");
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/* Start the timer */
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mod_timer(&tx_timer, jiffies + (TX_TIMER_INTERVAL * HZ));
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clear_bit(BT_ASLEEP, &flags);
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}
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}
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/**
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* @brief@ main sleep work handling function which update the flags
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* and activate and deactivate UART ,check FIFO.
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*/
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static void bluesleep_sleep_work(struct work_struct *work)
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{
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if (bluesleep_can_sleep()) {
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/* already asleep, this is an error case */
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if (test_bit(BT_ASLEEP, &flags)) {
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BT_DBG("already asleep");
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return;
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}
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if (bsi->uport->ops->tx_empty(bsi->uport)) {
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BT_DBG("going to sleep...");
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set_bit(BT_ASLEEP, &flags);
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wake_lock_timeout(&bsi->wake_lock, HZ / 2);
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} else {
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mod_timer(&tx_timer,
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jiffies + (TX_TIMER_INTERVAL * HZ));
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return;
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}
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} else if (!test_bit(BT_ASLEEP, &flags)) {
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mod_timer(&tx_timer, jiffies + (TX_TIMER_INTERVAL * HZ));
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} else {
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bluesleep_sleep_wakeup();
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}
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}
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/**
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* A tasklet function that runs in tasklet context and reads the value
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* of the HOST_WAKE GPIO pin and further defer the work.
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* @param data Not used.
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*/
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static void bluesleep_hostwake_task(unsigned long data)
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{
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BT_DBG("hostwake line change");
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spin_lock(&rw_lock);
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if (gpio_get_value(bsi->host_wake) == bsi->host_wake_assert)
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bluesleep_rx_busy();
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else
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bluesleep_rx_idle();
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spin_unlock(&rw_lock);
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}
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static struct uart_port *bluesleep_get_uart_port(void)
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{
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struct uart_port *uport = NULL;
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if (bluesleep_uart_dev) {
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uport = platform_get_drvdata(bluesleep_uart_dev);
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if (uport)
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BT_DBG(
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"%s get uart_port from blusleep_uart_dev: %s, port irq: %d",
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__func__, bluesleep_uart_dev->name,
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uport->irq);
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}
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return uport;
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}
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static int bluesleep_lpm_proc_show(struct seq_file *m, void *v)
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{
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seq_printf(m, "lpm enable: %d\n", has_lpm_enabled);
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return 0;
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}
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static int bluesleep_lpm_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, bluesleep_lpm_proc_show, NULL);
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}
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static ssize_t bluesleep_write_proc_lpm(struct file *file,
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const char __user *buffer,
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size_t count, loff_t *pos)
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{
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char b;
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if (count < 1)
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return -EINVAL;
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if (copy_from_user(&b, buffer, 1))
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return -EFAULT;
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if (b == '0') {
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/* HCI_DEV_UNREG */
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bluesleep_stop();
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has_lpm_enabled = false;
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bsi->uport = NULL;
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} else {
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/* HCI_DEV_REG */
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if (!has_lpm_enabled) {
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has_lpm_enabled = true;
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if (bluesleep_uart_dev)
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bsi->uport = bluesleep_get_uart_port();
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/* if bluetooth started, start bluesleep*/
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bluesleep_start();
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}
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}
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return count;
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}
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static const struct file_operations lpm_fops = {
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.owner = THIS_MODULE,
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.open = bluesleep_lpm_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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.write = bluesleep_write_proc_lpm,
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};
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/**
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* Handles transmission timer expiration.
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* @param data Not used.
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*/
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static void bluesleep_tx_timer_expire(unsigned long data)
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{
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unsigned long irq_flags;
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spin_lock_irqsave(&rw_lock, irq_flags);
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BT_DBG("Tx timer expired");
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/* were we silent during the last timeout */
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if (!test_bit(BT_TXDATA, &flags)) {
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BT_DBG("Tx has been idle");
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bluesleep_tx_idle();
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} else {
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BT_DBG("Tx data during last period");
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mod_timer(&tx_timer, jiffies + (TX_TIMER_INTERVAL*HZ));
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}
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/* clear the incoming data flag */
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clear_bit(BT_TXDATA, &flags);
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spin_unlock_irqrestore(&rw_lock, irq_flags);
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}
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/**
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* Schedules a tasklet to run when receiving an interrupt on the
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* <code>HOST_WAKE</code> GPIO pin.
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* @param irq Not used.
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* @param dev_id Not used.
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*/
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static irqreturn_t bluesleep_hostwake_isr(int irq, void *dev_id)
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{
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/* schedule a tasklet to handle the change in the host wake line */
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tasklet_schedule(&hostwake_task);
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wake_lock(&bsi->wake_lock);
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return IRQ_HANDLED;
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}
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/**
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* Starts the Sleep-Mode Protocol on the Host.
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* @return On success, 0. On error, -1, and <code>errno</code> is set
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* appropriately.
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*/
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static int bluesleep_start(void)
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{
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int retval;
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unsigned long irq_flags;
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spin_lock_irqsave(&rw_lock, irq_flags);
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if (test_bit(BT_PROTO, &flags)) {
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spin_unlock_irqrestore(&rw_lock, irq_flags);
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return 0;
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}
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spin_unlock_irqrestore(&rw_lock, irq_flags);
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if (!atomic_dec_and_test(&open_count)) {
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atomic_inc(&open_count);
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return -EBUSY;
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}
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/* start the timer */
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mod_timer(&tx_timer, jiffies + (TX_TIMER_INTERVAL*HZ));
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retval = request_irq(bsi->host_wake_irq, bluesleep_hostwake_isr,
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IRQF_TRIGGER_FALLING |
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IRQF_TRIGGER_RISING | IRQF_NO_SUSPEND,
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"bluetooth hostwake", NULL);
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if (retval < 0) {
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BT_ERR("Couldn't acquire BT_HOST_WAKE IRQ");
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goto fail;
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}
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retval = enable_irq_wake(bsi->host_wake_irq);
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if (retval < 0) {
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BT_ERR("Couldn't enable BT_HOST_WAKE as wakeup interrupt");
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free_irq(bsi->host_wake_irq, NULL);
|
goto fail;
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}
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set_bit(BT_PROTO, &flags);
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wake_lock(&bsi->wake_lock);
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|
return 0;
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fail:
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del_timer(&tx_timer);
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atomic_inc(&open_count);
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return retval;
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}
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/**
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* Stops the Sleep-Mode Protocol on the Host.
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*/
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static void bluesleep_stop(void)
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{
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unsigned long irq_flags;
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spin_lock_irqsave(&rw_lock, irq_flags);
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if (!test_bit(BT_PROTO, &flags)) {
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spin_unlock_irqrestore(&rw_lock, irq_flags);
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return;
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}
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del_timer(&tx_timer);
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clear_bit(BT_PROTO, &flags);
|
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if (test_bit(BT_ASLEEP, &flags))
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clear_bit(BT_ASLEEP, &flags);
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atomic_inc(&open_count);
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spin_unlock_irqrestore(&rw_lock, irq_flags);
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if (disable_irq_wake(bsi->host_wake_irq))
|
BT_ERR("Couldn't disable hostwake IRQ wakeup mode\n");
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free_irq(bsi->host_wake_irq, NULL);
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wake_lock_timeout(&bsi->wake_lock, HZ / 2);
|
}
|
|
static int assert_level = -1;
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module_param(assert_level, int, S_IRUGO);
|
MODULE_PARM_DESC(assert_level, "BT_LPM hostwake/btwake assert level");
|
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static int __init bluesleep_probe(struct platform_device *pdev)
|
{
|
struct device_node *np = pdev->dev.of_node;
|
struct device *dev = &pdev->dev;
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struct gpio_config config;
|
int ret, uart_index;
|
u32 val;
|
|
bsi = devm_kzalloc(&pdev->dev, sizeof(struct bluesleep_info),
|
GFP_KERNEL);
|
if (!bsi)
|
return -ENOMEM;
|
|
bsi->host_wake = of_get_named_gpio_flags(np, "bt_hostwake",
|
0, (enum of_gpio_flags *)&config);
|
if (!gpio_is_valid(bsi->host_wake)) {
|
BT_ERR("get gpio bt_hostwake failed\n");
|
return -EINVAL;
|
}
|
|
BT_DBG(
|
"bt_hostwake gpio=%d mul-sel=%d pull=%d drv_level=%d data=%d\n",
|
config.gpio,
|
config.mul_sel,
|
config.pull,
|
config.drv_level,
|
config.data);
|
|
/* set host_wake_assert */
|
bsi->host_wake_assert = config.data;
|
if (assert_level != -1) {
|
bsi->host_wake_assert = (assert_level & 0x02) > 0;
|
BT_DBG("override host_wake assert with to module_para assert_level");
|
}
|
|
ret = devm_gpio_request(dev, bsi->host_wake, "bt_hostwake");
|
if (ret < 0) {
|
BT_ERR("can't request bt_hostwake gpio %d\n",
|
bsi->host_wake);
|
return ret;
|
}
|
ret = gpio_direction_input(bsi->host_wake);
|
if (ret < 0) {
|
BT_ERR("can't request input direction bt_wake gpio %d\n",
|
bsi->host_wake);
|
return ret;
|
}
|
|
if (!of_property_read_u32(np, "wakeup_source", &bsi->wakeup_enable) &&
|
(bsi->wakeup_enable == 0)) {
|
BT_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;
|
}
|
|
bsi->ext_wake = of_get_named_gpio_flags(np, "bt_wake",
|
0, (enum of_gpio_flags *)&config);
|
if (!gpio_is_valid(bsi->ext_wake)) {
|
BT_ERR("get gpio bt_wake failed\n");
|
return -EINVAL;
|
}
|
|
BT_DBG(
|
"bt_wake gpio=%d mul-sel=%d pull=%d drv_level=%d data=%d\n",
|
config.gpio,
|
config.mul_sel,
|
config.pull,
|
config.drv_level,
|
config.data);
|
|
ret = devm_gpio_request(dev, bsi->ext_wake, "bt_wake");
|
if (ret < 0) {
|
BT_ERR("can't request bt_wake gpio %d\n",
|
bsi->ext_wake);
|
return ret;
|
}
|
|
/* set ext_wake_assert */
|
bsi->ext_wake_assert = config.data;
|
if (assert_level != -1) {
|
bsi->ext_wake_assert = (assert_level & 0x01) > 0;
|
BT_DBG("override ext_wake assert with to module_para assert_level");
|
}
|
|
/* 1.set bt_wake as output and the level is assert, assert bt wake */
|
ret = gpio_direction_output(bsi->ext_wake, bsi->ext_wake_assert);
|
if (ret < 0) {
|
BT_ERR("can't request output direction bt_wake gpio %d\n",
|
bsi->ext_wake);
|
return ret;
|
}
|
|
/* 2.get bt_host_wake gpio irq */
|
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;
|
return ret;
|
}
|
|
uart_index = DEFAULT_UART_INDEX;
|
if (!of_property_read_u32(np, "uart_index", &val)) {
|
switch (val) {
|
case 0:
|
case 1:
|
case 2:
|
uart_index = val;
|
break;
|
default:
|
BT_ERR("unsupported uart_index (%u)\n", val);
|
}
|
}
|
BT_DBG("uart_index (%u)\n", uart_index);
|
bluesleep_uart_dev = sw_uart_get_pdev(uart_index);
|
|
wake_lock_init(&bsi->wake_lock, WAKE_LOCK_SUSPEND, "bluesleep");
|
return 0;
|
}
|
|
static int bluesleep_remove(struct platform_device *pdev)
|
{
|
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);
|
}
|
|
wake_lock_destroy(&bsi->wake_lock);
|
if (bsi->wakeup_enable) {
|
BT_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_DBG("%s", __func__);
|
|
return 0;
|
}
|
|
static int bluesleep_suspend(struct platform_device *pdev, pm_message_t state)
|
{
|
BT_DBG("%s", __func__);
|
|
return 0;
|
}
|
|
static const struct of_device_id sunxi_btlpm_ids[] = {
|
{ .compatible = "allwinner,sunxi-btlpm" },
|
{ /* Sentinel */ }
|
};
|
|
static struct platform_driver bluesleep_driver = {
|
.remove = bluesleep_remove,
|
.suspend = bluesleep_suspend,
|
.resume = bluesleep_resume,
|
.driver = {
|
.owner = THIS_MODULE,
|
.name = "sunxi-btlpm",
|
.of_match_table = sunxi_btlpm_ids,
|
},
|
};
|
|
/**
|
* 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_DBG("BlueSleep Mode Driver Ver %s", VERSION);
|
|
retval = platform_driver_probe(&bluesleep_driver, bluesleep_probe);
|
if (retval)
|
return retval;
|
|
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;
|
}
|
/* read/write proc entries */
|
ent = proc_create("lpm", 0660, sleep_dir, &lpm_fops);
|
if (ent == NULL) {
|
BT_ERR("Unable to create /proc/%s/lpm entry", PROC_DIR);
|
retval = -ENOMEM;
|
goto fail;
|
}
|
|
flags = 0; /* clear all status bits */
|
|
/* Initialize spinlock. */
|
spin_lock_init(&rw_lock);
|
|
/* 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);
|
|
return 0;
|
|
fail:
|
remove_proc_entry("lpm", 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)
|
{
|
platform_driver_unregister(&bluesleep_driver);
|
|
remove_proc_entry("lpm", sleep_dir);
|
remove_proc_entry("sleep", bluetooth_dir);
|
remove_proc_entry("bluetooth", 0);
|
}
|
|
module_init(bluesleep_init);
|
module_exit(bluesleep_exit);
|
|
MODULE_DESCRIPTION("Bluetooth Sleep Mode Driver ver %s " VERSION);
|
#ifdef MODULE_LICENSE
|
MODULE_LICENSE("GPL");
|
#endif
|
