Accessing a serial port from a linux kernel module

Question

Hello Linux Kernel Driver Gurus!

I\'m writing a v4l2 driver for a camera that uses a serial interface for configuration. I\'d like the driver to configure the camer

Answer 1

First I would advise you to find a way to do this from the userspace if possible: what you try to achieve here really is userspace code in kernel code.

But if you don't find a way to do it, this article shows you how to do userspace calls in kernelspace.

Since you want to access a serial port, you should have calls that tty oriented, for instance for open:

serial_fd = sys_open("/dev/ttyS0",  O_RDWR | O_NOCTTY | O_NONBLOCK))