From mboxrd@z Thu Jan  1 00:00:00 1970
From: Rohit Sarkar <rohitsarkar5398@gmail.com>
Subject: Re: Beginner query regarding usbhid
Date: Wed, 25 Mar 2020 22:43:07 +0530
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To: Hubert CHAUMETTE <hubert.chaumette@kolabnow.com>
Cc: Oliver Neukum <oneukum@suse.com>, linux-usb@vger.kernel.org, linux-newbie@vger.kernel.org

On Wed, Mar 25, 2020 at 04:41:38PM +0100, Hubert CHAUMETTE wrote:
> Le 25/03/2020 15:47, Rohit Sarkar a =E9crit=A0:
> > 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.
> >=20
> > I am certain I am missing something fundamental. Could someone help me
> > with this.
>=20
> Hi,
>=20
> 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.=20

The command I used for building was "make -C /home/rohit/LINUX/kernels/stag=
ing  M=3D$(pwd)"
and for installing the modules: "sudo make -C /home/rohit/LINUX/kernels/sta=
ging  M=3D$(pwd) modules_install"
both were executed from the usbhid directory.
from the usbhid directory.
> Hubert Chaumette

Thanks,
Rohit