oleavr-rgl-a500-mini-linux-.../drivers/bluetooth/bcm_btlpm_rc.c

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2022-05-07 01:01:45 +02:00
/*
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) 2008-2010, 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.
*/
#include <linux/module.h>
#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/param.h>
#include <linux/bitops.h>
#include <linux/termios.h>
#include <linux/wakelock.h>
#include <linux/gpio.h>
#include <linux/sys_config.h>
#include <linux/of_gpio.h>
#include <linux/power/scenelock.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <linux/serial_core.h>
#include <linux/input.h>
#define BT_SLEEP_DBG
#undef BT_DBG
#undef BT_ERR
#ifdef BT_SLEEP_DBG
#define BT_DBG(fmt, arg...) \
printk(KERN_DEBUG "[BT_LPM] %s: " fmt "\n" , __func__ , ## arg)
#else
#define BT_DBG(fmt, arg...)
#endif
#define BT_ERR(fmt, arg...) \
printk(KERN_ERR "[BT_LPM] %s: " fmt "\n" , __func__ , ## arg)
/*
* Defines
*/
#define VERSION "1.3"
#define PROC_DIR "bluetooth/sleep"
static int bluesleep_start(void);
static void bluesleep_stop(void);
struct bluesleep_info {
unsigned host_wake;
unsigned ext_wake;
unsigned host_wake_irq;
struct wake_lock wake_lock;
struct uart_port *uport;
unsigned host_wake_assert:1;
unsigned ext_wake_assert:1;
};
static bool has_lpm_enabled;
static struct bluesleep_info *bsi;
/*
* Global variables
*/
struct proc_dir_entry *bluetooth_dir, *sleep_dir;
/*
static struct input_dev *power_key_dev;
*/
static bool has_enter_inter;
static bool has_enter_suspend;
static bool wake_from_suspend;
/*
* Local functions
*/
static int bluesleep_lpm_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "lpm enable: %d\n", has_lpm_enabled);
return 0;
}
static int bluesleep_lpm_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, bluesleep_lpm_proc_show, NULL);
}
static ssize_t bluesleep_write_proc_lpm(struct file *file,
const char __user *buffer,
size_t count, loff_t *pos)
{
char b;
if (count < 1)
return -EINVAL;
if (copy_from_user(&b, buffer, 1))
return -EFAULT;
if (b == '0') {
if (has_lpm_enabled) {
bluesleep_stop();
has_lpm_enabled = false;
}
} else if (b == '1') {
if (!has_lpm_enabled) {
has_lpm_enabled = true;
bluesleep_start();
}
} else
BT_ERR("%s, error value: %c", __FUNCTION__, b);
return count;
}
static int bluesleep_btwrite_proc_show(struct seq_file *m, void *v)
{
seq_printf(m, "it's not support\n");
return 0;
}
static int bluesleep_btwrite_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, bluesleep_btwrite_proc_show, NULL);
}
static ssize_t bluesleep_write_proc_btwrite(struct file *file,
const char __user *buffer,
size_t count, loff_t *pos)
{
char b;
if (count < 1)
return -EINVAL;
if (copy_from_user(&b, buffer, 1))
return -EFAULT;
if (b == '0')
gpio_set_value(bsi->ext_wake, !(bsi->ext_wake_assert));
else if (b == '1')
gpio_set_value(bsi->ext_wake, bsi->ext_wake_assert);
else
BT_ERR("%s, error value: %c", __FUNCTION__, b);
return count;
}
static const struct file_operations lpm_fops = {
.owner = THIS_MODULE,
.open = bluesleep_lpm_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = bluesleep_write_proc_lpm,
};
static const struct file_operations btwrite_fops = {
.owner = THIS_MODULE,
.open = bluesleep_btwrite_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = bluesleep_write_proc_btwrite,
};
static int bluesleep_suspend_proc_open(struct inode *inode, struct file *file)
{
return nonseekable_open(inode, file);
}
static ssize_t bluesleep_suspend_proc_read(struct file *file,
char __user *buf, size_t count, loff_t *ptr)
{
signed char ret = 0;
if (wake_from_suspend)
ret = 1;
else
ret = 0;
if (copy_to_user(buf, &ret, 1))
return -EFAULT;
return 1;
}
static ssize_t bluesleep_suspend_proc_write(struct file *file,
const char __user *buffer,
size_t count, loff_t *pos)
{
char b;
if (count < 1)
return -EINVAL;
if (copy_from_user(&b, buffer, 1))
return -EFAULT;
if (b == '1')
wake_from_suspend = false;
else
BT_ERR("%s, error value: %c", __FUNCTION__, b);
return count;
}
static const struct file_operations suspend_fops = {
.owner = THIS_MODULE,
.open = bluesleep_suspend_proc_open,
.read = bluesleep_suspend_proc_read,
.write = bluesleep_suspend_proc_write,
};
/**
* 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)
{
/*
BT_ERR("Enter interrupt function...");
*/
has_enter_inter = true;
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.
*/
static int bluesleep_start(void)
{
int retval;
/* assert BT_WAKE */
gpio_set_value(bsi->ext_wake, bsi->ext_wake_assert);
retval = request_irq(bsi->host_wake_irq, bluesleep_hostwake_isr,
IRQF_TRIGGER_FALLING
| IRQF_NO_SUSPEND,
"bluetooth hostwake", NULL);
if (retval < 0) {
BT_ERR("Couldn't acquire BT_HOST_WAKE IRQ");
goto fail;
}
retval = enable_wakeup_src(CPUS_GPIO_SRC, bsi->host_wake);
if (retval < 0) {
BT_ERR("Couldn't enable BT_HOST_WAKE as wakeup interrupt");
free_irq(bsi->host_wake_irq, NULL);
goto fail;
}
return 0;
fail:
return retval;
}
static void bluesleep_stop(void)
{
/* assert BT_WAKE */
gpio_set_value(bsi->ext_wake, bsi->ext_wake_assert);
if (disable_wakeup_src(CPUS_GPIO_SRC, bsi->host_wake))
BT_ERR("Couldn't disable hostwake IRQ wakeup mode\n");
free_irq(bsi->host_wake_irq, NULL);
}
static int __init bluesleep_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct device *dev = &pdev->dev;
struct gpio_config config;
int ret;
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);
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;
}
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;
}
/* 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;
}
/* set ext_wake_assert and host_wake_assert */
bsi->ext_wake_assert = bsi->host_wake_assert = config.data;
/* 2.get bt_host_wake gpio irq */
bsi->host_wake_irq = gpio_to_irq(bsi->host_wake);
if (IS_ERR_VALUE(bsi->host_wake_irq)) {
BT_ERR("map gpio [%d] to virq failed, errno = %d\n",
bsi->host_wake, bsi->host_wake_irq);
ret = -ENODEV;
return ret;
}
/* register input device */
/*
power_key_dev = input_allocate_device();
if (!power_key_dev) {
BT_ERR("ir_dev: not enough memory for input device\n");
return -ENOMEM;
}
power_key_dev->name = "bt-powerkey";
power_key_dev->id.bustype = BUS_HOST;
power_key_dev->evbit[0] = BIT_MASK(EV_KEY);
set_bit(KEY_POWER, power_key_dev->keybit);
ret = input_register_device(power_key_dev);
if (ret) {
input_free_device(power_key_dev);
BT_ERR("ir_rx_init: register input device exception, exit\n");
return -EBUSY;
}
*/
has_enter_inter = false;
has_enter_suspend = false;
wake_from_suspend = false;
return 0;
}
static int bluesleep_remove(struct platform_device *pdev)
{
/* assert bt wake */
gpio_set_value(bsi->ext_wake, bsi->ext_wake_assert);
if (has_lpm_enabled) {
if (disable_wakeup_src(CPUS_GPIO_SRC, bsi->host_wake))
BT_ERR("Couldn't disable hostwake IRQ wakeup mode\n");
free_irq(bsi->host_wake_irq, NULL);
}
has_lpm_enabled = false;
return 0;
}
static int bluesleep_resume(struct platform_device *pdev)
{
BT_ERR("bluesleep_resume.\n");
if (has_enter_suspend && has_enter_inter)
wake_from_suspend = true;
has_enter_suspend = false;
has_enter_inter = false;
return 0;
}
static int bluesleep_suspend(struct platform_device *pdev, pm_message_t state)
{
BT_ERR("bluesleep_suspend.\n");
has_enter_inter = false;
has_enter_suspend = true;
wake_from_suspend = false;
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,
},
};
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;
}
ent = proc_create("lpm", 0, sleep_dir, &lpm_fops);
if (ent == NULL) {
BT_ERR("Unable to create /proc/%s/lpm entry", PROC_DIR);
retval = -ENOMEM;
goto fail;
}
ent = proc_create("btwrite", 0, sleep_dir, &btwrite_fops);
if (ent == NULL) {
BT_ERR("Unable to create /proc/%s/btwrite entry", PROC_DIR);
retval = -ENOMEM;
goto fail;
}
ent = proc_create("suspend", 0, sleep_dir, &suspend_fops);
if (ent == NULL) {
BT_ERR("Unable to create /proc/%s/suspend entry", PROC_DIR);
retval = -ENOMEM;
goto fail;
}
return 0;
fail:
remove_proc_entry("suspend", sleep_dir);
remove_proc_entry("btwrite", sleep_dir);
remove_proc_entry("lpm", sleep_dir);
remove_proc_entry("sleep", bluetooth_dir);
remove_proc_entry("bluetooth", 0);
return retval;
}
static void __exit bluesleep_exit(void)
{
platform_driver_unregister(&bluesleep_driver);
remove_proc_entry("suspend", sleep_dir);
remove_proc_entry("btwrite", sleep_dir);
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