426 lines
9.9 KiB
C
Executable File
426 lines
9.9 KiB
C
Executable File
/*
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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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* 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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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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#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/gpio.h>
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#include <linux/sys_config.h>
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#include <linux/of_gpio.h>
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#include <net/bluetooth/bluetooth.h>
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#define BT_SLEEP_DBG
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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...) printk(KERN_DEBUG "[BT_LPM] %s: " fmt "\n" , __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...) printk(KERN_ERR "[BT_LPM] %s: " fmt "\n" , __func__ , ## arg)
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/*
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* Defines
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*/
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#define VERSION "1.1"
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#define PROC_DIR "bluetooth/sleep"
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#define DEFAULT_UART_INDEX 1
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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 host_wake;
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unsigned host_wake_irq;
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struct uart_port *uport;
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unsigned host_wake_assert;
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};
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/* state variable names and bit positions */
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#define BT_PROTO 0x00
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#define BT_ACTIVE 0x02
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#define BT_SUSPEND 0x04
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/* variable use indicate lpm modle */
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static bool has_lpm_enabled = false;
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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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struct proc_dir_entry *bluetooth_dir, *sleep_dir;
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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("%s get uart_port from blusleep_uart_dev: %s, port irq: %d",
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__FUNCTION__, bluesleep_uart_dev->name, 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, 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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* 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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BT_DBG("%s", __func__);
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return 0;
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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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BT_DBG("bluesleep_acquire irq\n");
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if (test_bit(BT_PROTO, &flags)) {
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return 0;
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}
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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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if(bsi->host_wake_assert == 0){
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retval = request_irq(bsi->host_wake_irq, bluesleep_hostwake_isr, IRQF_TRIGGER_FALLING | IRQF_NO_SUSPEND, "bluetooth hostwake", NULL);
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}else{
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retval = request_irq(bsi->host_wake_irq, bluesleep_hostwake_isr, IRQF_TRIGGER_RISING | IRQF_NO_SUSPEND, "bluetooth hostwake", NULL);
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}
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if (retval < 0) {
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BT_ERR("Couldn't acquire bt_host_wake IRQ or enable it");
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goto fail;
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}
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set_bit(BT_PROTO, &flags);
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return 0;
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fail:
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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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BT_DBG("%s", __func__);
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if (!test_bit(BT_PROTO, &flags)) {
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return;
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}
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clear_bit(BT_PROTO, &flags);
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atomic_inc(&open_count);
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disable_irq_wake(bsi->host_wake_irq);
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free_irq(bsi->host_wake_irq, NULL);
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}
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extern struct platform_device *sw_uart_get_pdev(int uart_id);
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static int __init bluesleep_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct device *dev = &pdev->dev;
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struct gpio_config config;
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int ret,uart_index;
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u32 val;
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bsi = devm_kzalloc(&pdev->dev,sizeof(struct bluesleep_info), GFP_KERNEL);
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if (!bsi)
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return -ENOMEM;
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bsi->host_wake = of_get_named_gpio_flags(np, "bt_hostwake", 0, (enum of_gpio_flags *)&config);
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if (!gpio_is_valid(bsi->host_wake)) {
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BT_ERR("get gpio bt_hostwake failed\n");
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return -EINVAL;
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}
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BT_DBG("bt_hostwake gpio=%d mul-sel=%d pull=%d drv_level=%d data=%d\n",
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config.gpio,
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config.mul_sel,
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config.pull,
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config.drv_level,
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config.data);
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ret = devm_gpio_request(dev, bsi->host_wake, "bt_hostwake");
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if (ret < 0) {
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BT_ERR("can't request bt_hostwake gpio %d\n",
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bsi->host_wake);
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return ret;
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}
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ret = gpio_direction_input(bsi->host_wake);
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if (ret < 0) {
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BT_ERR("can't request input direction bt_wake gpio %d\n",
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bsi->host_wake);
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return ret;
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}
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//set ext_wake_assert and host_wake_assert
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bsi->host_wake_assert = config.data;
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//2.get bt_host_wake gpio irq
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bsi->host_wake_irq = gpio_to_irq(bsi->host_wake);
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if (IS_ERR_VALUE(bsi->host_wake_irq)) {
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BT_ERR("map gpio [%d] to virq failed, errno = %d\n",bsi->host_wake, bsi->host_wake_irq);
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ret = -ENODEV;
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return ret;
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}
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uart_index = DEFAULT_UART_INDEX;
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if (!of_property_read_u32(np, "uart_index", &val)) {
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switch (val) {
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case 0:
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case 1:
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case 2:
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uart_index = val;
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break;
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default:
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BT_ERR("unsupported uart_index (%u)\n", val);
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}
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}
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BT_DBG("uart_index (%u)\n", uart_index);
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bluesleep_uart_dev = sw_uart_get_pdev(uart_index);
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clear_bit(BT_SUSPEND, &flags);
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set_bit(BT_ACTIVE, &flags);
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return 0;
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}
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static int bluesleep_remove(struct platform_device *pdev)
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{
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BT_DBG("%s", __func__);
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if (!test_bit(BT_PROTO, &flags)) {
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return 0;
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}
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disable_irq_wake(bsi->host_wake_irq);
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free_irq(bsi->host_wake_irq, NULL);
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return 0;
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}
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static int bluesleep_resume(struct platform_device *pdev)
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{
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BT_DBG("%s", __func__);
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if (test_bit(BT_SUSPEND, &flags)) {
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disable_irq_wake(bsi->host_wake_irq);
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clear_bit(BT_SUSPEND, &flags);
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set_bit(BT_ACTIVE, &flags);
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}
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return 0;
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}
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static int bluesleep_suspend(struct platform_device *pdev, pm_message_t state)
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{
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BT_DBG("%s", __func__);
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if(test_bit(BT_ACTIVE, &flags)) {
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enable_irq_wake(bsi->host_wake_irq);
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clear_bit(BT_ACTIVE, &flags);
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set_bit(BT_SUSPEND, &flags);
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}
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return 0;
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}
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static const struct of_device_id sunxi_btlpm_ids[] = {
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{ .compatible = "allwinner,sunxi-btlpm" },
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{ /* Sentinel */ }
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};
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static struct platform_driver bluesleep_driver = {
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.remove = bluesleep_remove,
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.suspend = bluesleep_suspend,
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.resume = bluesleep_resume,
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.driver = {
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.owner = THIS_MODULE,
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.name = "sunxi-btlpm",
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.of_match_table = sunxi_btlpm_ids,
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},
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};
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/**
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* Initializes the module.
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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 __init bluesleep_init(void)
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{
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int retval;
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struct proc_dir_entry *ent;
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BT_DBG("BlueSleep Mode Driver Ver %s", VERSION);
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/* clear all status bits */
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flags = 0;
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retval = platform_driver_probe(&bluesleep_driver, bluesleep_probe);
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if (retval)
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return retval;
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bluetooth_dir = proc_mkdir("bluetooth", NULL);
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if (bluetooth_dir == NULL) {
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BT_ERR("Unable to create /proc/bluetooth directory");
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goto unreg_drv;
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}
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sleep_dir = proc_mkdir("sleep", bluetooth_dir);
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if (sleep_dir == NULL) {
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BT_ERR("Unable to create /proc/%s directory", PROC_DIR);
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goto rm_bt_dir;
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}
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ent = proc_create("lpm", 0, sleep_dir,&lpm_fops);
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if (ent == NULL) {
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BT_ERR("Unable to create /proc/%s/lpm entry", PROC_DIR);
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goto rm_sleep_dir;
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}
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return 0;
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rm_sleep_dir:
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remove_proc_entry("sleep", bluetooth_dir);
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rm_bt_dir:
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remove_proc_entry("bluetooth", 0);
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unreg_drv:
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platform_driver_unregister(&bluesleep_driver);
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return retval;
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}
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/**
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* Cleans up the module.
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*/
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static void __exit bluesleep_exit(void)
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{
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platform_driver_unregister(&bluesleep_driver);
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remove_proc_entry("lpm", sleep_dir);
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remove_proc_entry("sleep", bluetooth_dir);
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remove_proc_entry("bluetooth", 0);
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}
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module_init(bluesleep_init);
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module_exit(bluesleep_exit);
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MODULE_DESCRIPTION("Bluetooth Sleep Mode Driver ver %s " VERSION);
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#ifdef MODULE_LICENSE
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MODULE_LICENSE("GPL");
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#endif
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