Re: How to access correctly serial port inside module?

["Lars K.W. Gohlke" <lkwg82@gmx.de>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Jan Engelhardt schrieb:
> On May 24 2007 19:19, Lars K.W. Gohlke wrote:
> > I want to read from serial port (I mean the port, which is called
> > /dev/ttyS0 in user-space). Then I want copy_to_user() it through
> > /proc/serialPort
> >
> > This is just to get familiar with driver programming (in kernelspace),
> > it could be better done in userspace - I know. But this is for learning.
> >
> > It is a kind of synthetic problem, but after this, I hope too know how
> > to handle further ones.
> >
> > Understood? It is a little bit strange, but hope it is explained well. ;)
> >
> > If tell me that for /dev/ttyS0 I can adept it to /dev/ttyS1 etc..
>
>
> struct file *filp = filp_open("/dev/ttyS0");
> char buf[4096];
> mm_segment_t oldfs = get_fs();
> loff_t pos = 0;
>
> set_ds(KERNEL_DS);
> while (vfs_read(filp, buf, sizeof(buf), &pos) > 0)
> 	printk("%s\n", buf);
>
> filp_close(filp);
>
>
>
> [I've warned about it... ;-) ]
>
> 	Jan
is it the way to access from kernelspace the userspace fs?
the not-correct-way?

If it is so, I will wait for another solution ;)

Dont want to learn writing nasty kernel code. *g*

Anyway thx.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.3 (MingW32) - GPGrelay v0.959

iD8DBQFGVeRlAAomYJ1taN8RAj4LAJ4oD+3yGy6k69nBEXi5BSda+tdeNACeOCTY
+nJSUcsGpwh25uDjyC2GKRU=
=twVz
-----END PGP SIGNATURE-----

begin:vcard
fn:Lars K.W. Gohlke
n:Gohlke;Lars K.W.
email;internet:lkwg82@gmx.de
x-mozilla-html:FALSE
version:2.1
end:vcard