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A comment on Linux Kernel Module Programming Guide. Parent comment

Re:Linux Kernel Module Programming Guide by mytailorisrich on Tuesday August 24, 2021 @04:27AM (#28286309)
You need to have the datasheet.

These are usually a Google search away and the way people develop drivers even in professional settings.

For simple devices (e.g. I2C/SPI sensors) the functionality, number of registers, and procedures are usually very limited and it is not difficult.

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Re:Linux Kernel Module Programming Guide by zsmi on Tuesday August 24, 2021 @01:38PM (#28292290)
For simple devices probably user space is just fine. i.e. https://www.kernel.org/doc/Documentation/spi/spidev Usually only if you need an IRQ or something does it require kernel space.
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