CODEWITHSUNDEEP
linux-kernellinux-device-driver
Vijay
Vijay

Reputation: 61

Devices not getting displayed under /dev when using modprobe

I use PCAN Driver for Linux v8 developed by PEAK SYSTEMS.

After successful compilation when tried to load the Linux Kernel Module (LKM) named pcan

sudo modprobe pcan
lspcan -T -t -a

Devices are not getting displayed under /dev

Note: I have not connected actual device or hardware in my PC.

Is it expected behavior? Or regardless of actual device connection, those should get displayed? Which is expected behavior?

Reason why I am asking is, when doing insmod with my own LKM, I got the devices under /dev.

Upvotes: 0

Views: 1510

Answers (2)

user2699113
user2699113

Reputation: 4509

It is possible that PCAN driver doesn't create entry in /dev on its own, and you need to do it manually. Not every driver creates those files automatically. Try to look at /proc/devices file if there is the device you are expecting. If yes - try to create appropriate device node in /dev using mknod.

Edit: If you have no connected device in your PC - how driver could recognize it and create appropriate files in /dev?

Upvotes: 0

Acorn
Acorn

Reputation: 26196

Is it expected behavior? Or regardless of actual device connection, those should get displayed? Which is expected behavior?

In general, a driver should only create the /dev entries for devices that it is actually handling.

Since you don't have the hardware, it is normal that the driver did not create anything.

Upvotes: 1

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