android中bt_enable下set_bluetooth_power设置rfkill

android中bt_enable下set_bluetooth_power设置rfkill打开radio

如果kernel==>Networking support==>RF switch subsystem support没有打开的话
system/bluetooth/bluedroid/bluetooth.c
bt_enable
==> set_bluetooth_power就必须注释掉
否则从UI/settings里将无法启动蓝牙[luther.gliethttp]
但是我本地试验还是不能在UI打开BT,
1. logcat发现
W/bluedroid(  744): open(/sys/class/rfkill/rfkill0/type) failed: No such
file or directory (2)
2. shell中不见rfkill0等设备
/data/glx # ls /sys/class/rfkill/
/data/glx #
3. 内核注册设备的位置为(但是调用他的hci_uart_set_proto函数为什么没有执行呢)
hci_register_dev ==> hdev->rfkill = rfkill_alloc(hdev->name, &hdev->dev,
                        RFKILL_TYPE_BLUETOOTH, &hci_rfkill_ops, hdev);

所以你还需要一个dummy驱动才能创建,代码如下:

#include <linux/module.h>
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/rfkill.h>
#include <linux/platform_device.h>

static int rfkill_set_power(void *data, bool blocked);
static struct platform_device *rfkill_pdev;
static struct rfkill *rfkill;  /* for driver only */
static struct rfkill_ops rfkill_ops = {
    .set_block = rfkill_set_power,
};

static int rfkill_set_power(void *data, bool blocked)
{
    printk("rfkill to %d\n", blocked);
    return 0;
}

static int __init rfkill_init(void)
{
    int ret = 0;

    rfkill_pdev = platform_device_alloc("rfkill-dummy", -1);
    if (unlikely(!rfkill_pdev))
        return -ENOMEM;
    ret = platform_device_add(rfkill_pdev);
    if (ret) {
        platform_device_put(rfkill_pdev);
        return ret;
    }

    rfkill = rfkill_alloc(rfkill_pdev->name, &rfkill_pdev->dev,
                RFKILL_TYPE_BLUETOOTH, &rfkill_ops, NULL);

    if (unlikely(!rfkill))
        return -ENOMEM;

    ret = rfkill_register(rfkill);

    if (unlikely(ret)) {
        rfkill_destroy(rfkill);
    }

    return ret;
}

static void __exit rfkill_exit(void)
{
    if (likely(rfkill_pdev))
        platform_device_unregister(rfkill_pdev);

    if (likely(rfkill)) {
        rfkill_unregister(rfkill);
        rfkill_destroy(rfkill);
    }
}

module_init(rfkill_init);
module_exit(rfkill_exit);

MODULE_DESCRIPTION("rfkill-dummy driver");
MODULE_AUTHOR("Luther gliethttp ");
MODULE_LICENSE("GPL");

编译命令为：
make -C ~/kernel M=`pwd` modules
之后需要
insmod rfkill_dummy.ko
chmod 777 /sys/class/rfkill/rfkill0/state
然后UI即可正常enable