Android中断唤醒500ms实现指南

中断唤醒功能实现（维持500ms唤醒状态）

在Android驱动开发中，实现中断唤醒功能并维持500ms的唤醒状态是一个常见的需求，尤其在低功耗设备或需要快速响应的场景下。以下详细说明实现方法：

中断注册与初始化

使用request_irq函数注册中断处理程序，配置中断触发类型（如上升沿、下降沿或双边沿）。在驱动初始化阶段完成中断线的申请和配置：

int irq = gpio_to_irq(gpio_num); 
if (request_irq(irq, irq_handler, IRQF_TRIGGER_RISING, "example_irq", NULL)) {
    pr_err("Failed to request IRQ\n");
    return -EBUSY;
}

中断处理函数设计

在中断处理函数中触发唤醒源，并通过计时器维持500ms的唤醒状态。使用内核的wake_lock（旧版）或wakeup_source（新版）API：

static irqreturn_t irq_handler(int irq, void *dev_id) {
    // 获取唤醒锁
    wake_lock(&wake_lock);
    
    // 设置500ms定时器
    mod_timer(&wake_timer, jiffies + msecs_to_jiffies(500));
    
    return IRQ_HANDLED;
}

定时器回调释放唤醒锁

通过内核定时器实现精确的500ms唤醒时长控制。定时器到期后释放唤醒锁：

static void wake_timer_callback(struct timer_list *t) {
    wake_unlock(&wake_lock);
}

初始化定时器时需绑定回调函数：

timer_setup(&wake_timer, wake_timer_callback, 0);

电源管理集成

在驱动挂载时初始化唤醒锁，并在卸载时释放资源：

// 初始化唤醒锁（旧版API）
wake_lock_init(&wake_lock, WAKE_LOCK_SUSPEND, "example_wakelock");

// 新版API使用wakeup_source
struct wakeup_source *wakeup_source = wakeup_source_create("example_ws");

设备树配置（可选）

若中断线通过设备树定义，需在DTS文件中声明GPIO和中断属性：

example_device {
    compatible = "example,driver";
    interrupt-parent = <&gpio0>;
    interrupts = <5 IRQ_TYPE_EDGE_RISING>;
};

注意事项

• 唤醒锁替代方案：Android 4.4+推荐使用wakeup_source替代废弃的wake_lock。
• 中断上下文限制：在中断处理函数中避免耗时操作，仅触发唤醒和启动定时器。
• 并发处理：若需处理高频中断，需考虑防抖或工作队列机制。

完整实现需结合具体硬件平台的中断控制器特性调整，上述代码为通用逻辑框架。

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