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Two different types of device drivers

Guest david_8274

By Guest david_8274
in Microsoft Support & Discussions

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Guest david_8274

Guest david_8274

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Hi,

 

I feel that there are two different types of device drivers.

 

Type 1: the device driver provides userspace API such as .read, .write and .ioctl. The driver is assigned a major/minor number and userspace program may access physical devices by use the API it provides.

 

Type 2: the device driver doesn't not provide user space API (no read, write or .ioctl), and the driver is used by another driver in the kernel.

 

So how do I categorize these two types of drivers? What are the correct technical terms for them?

 

Thanks,

Wei

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