谁调用了驱动程序的probe()

问题描述

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如何调用 probe() 调用?谁叫它?根据我的理解，__init() 注册 driver 然后以某种方式调用 probe() 来register 设备data 和 irq 等等.它到底是怎么发生的?

How does probe() call gets called? Who calls it? As per my understanding, __init() registers driver and then somehow probe() is called to register the device data and irq etc. How exactly it happens?

我正在开发触摸屏驱动程序，它的 __init 将自身注册到 i2c 驱动程序.然后探测返回空值的expect i2c_client 数据.我想跟踪它在哪里被填满.

I am working on touchscreen driver and its __init registers itself to i2c driver. Then probe expect i2c_client data which returns null. I want to track where it gets filled.

推荐答案

长话短说:驱动程序的probe() 函数被调用作为为该特定总线调用register_driver 的结果.更准确地说，它由 bus_type 结构的 probe() 调用.在您的情况下:i2c_bus_type.

Long story short: the probe() function of the driver is called as a result of calling the register_driver for that specific bus. More precisely, it's called by the probe() of that bus_type structure. In your case: i2c_bus_type.

这是您的 I2C 案例中的调用链:

Here's the call chain in your I2C case:

• i2c_register_driver
• driver_register
• bus_add_driver
• driver_attach
• __driver_attach(用于您的设备)
• driver_probe_device
• really_probe
• i2c_device_probe(这是用于 i2c 驱动程序的 dev->bus->probe)
• your_probe_function

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