Re: Beginner query regarding usbhid

[Rohit Sarkar <rohitsarkar5398@gmail.com>]

On Wed, Mar 25, 2020 at 04:41:38PM +0100, Hubert CHAUMETTE wrote:
> Le 25/03/2020 15:47, Rohit Sarkar a écrit :
> > I was trying to mess around with the driver that drives my mouse. I
> > found out that it is usbhid. I then added a printk statement to the init
> > and exit function of usbhid.
> > I then compiled and installed the usbhid drivers. Post that I ran
> > `sudo modprobe -r usbhid` and `sudo modprobe usbhid` but couldnt observe
> > any logs in dmesg.
> > 
> > I am certain I am missing something fundamental. Could someone help me
> > with this.
> 
> Hi,
> 
> Did you check whether your module was effectively loaded with lsmod?
> What log level did you use in your printk statement? Depending on your
> system default loglevel your logs might not be printed. A quick fix
> would be to use one of the lowest levels (pr_emerg, but pr_err might
> suffice).
> Regards,

Hey,
I did check that module was loaded. And one of the signs was that my
mouse started working after insmod :).

I used printk(KERN_ALERT "some message") for logging. I also tried with
KERN_ERR but no luck. 

The command I used for building was "make -C /home/rohit/LINUX/kernels/staging  M=$(pwd)"
and for installing the modules: "sudo make -C /home/rohit/LINUX/kernels/staging  M=$(pwd) modules_install"
both were executed from the usbhid directory.
from the usbhid directory.
> Hubert Chaumette

Thanks,
Rohit