在Linux热插拔时检测设备的存在 [英] Detect the presence of a device when it's hot plugged in Linux

问题描述

我正在运行SPI 代码我想知道中的哪个功能代码负责在设备热插拔时对其进行检测.

I am running the SPI code on the panda board and I want to know which function in the code is responsible for detecting the device when it's hot plugged.

可以请具有嵌入式系统，Linux设备驱动程序和/或spi背景的人回答我的问题吗?

Can somebody with the background of embedded systems, Linux device drivers and/or spi please answer my question?

推荐答案

这是代码中执行魔术的行:

This is the line in your code that does the magic:

1286 MODULE_DEVICE_TABLE(of, omap_mcspi_of_match);

过程:
1.每个设备的驱动程序使用API​​ MODULE_DEVICE_TABLE公开其信息.每个设备都有唯一的vendor Id和device Id.
2.在编译时，构建过程将从驱动程序中提取此信息并构建表.
3.插入设备后，kernel会检查此device table以查看是否有任何driver 适用于特定的Vendor/Device Id.如果是，则它将加载该驱动程序并初始化设备.

Process:
1. Driver for each device exposes its information using the API MODULE_DEVICE_TABLE. Each device has a unique vendor Id and device Id.
2. At compilation time, the build process extracts this information out of the driver and builds a table.
3. When the device is plugged in, the kernel checks this device table to see if any driver is available for the particular Vendor/Device Id. If yes then it loads that driver and initializes the device.

阅读以下文章以了解更多信息:

Read following articles for more info:

1. http://www.linux-mag.com/id/2617/
2. http://www.linuxjournal.com/node/5604/print

1. http://www.linux-mag.com/id/2617/
2. http://www.linuxjournal.com/node/5604/print

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