[lkml]   [2004]   [Nov]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: patch for sysfs in the cyclades driver
On Wed, Nov 03, 2004 at 11:09:08AM -0200, Germano wrote:
> Hi
> I will have to study again the code I tried first (it was long ago), but
> the main problem was that due to that class be (somehow) derived from
> class_simple, I can one export using it the major and minor numbers for
> the device. Tosatti, maybe you can complete my answer with details,
> since it was you that advised me about this limitation.
> However, this was some time ago (kernel 2.6.7 was going to be released),
> and I didn't check how much sysfs for the tty drivers has changed since
> them. If I can attach this data (signalling states) to the port, it
> would be very preferable than attaching to the board as me and Scott are
> trying. Even because his advise about the possibility of my patch be
> overwritting one channel data with other's make a lot of sense and I
> will have to test it (I'm grateful for you, Scott).

The problem was class_simple only contains the "dev" attribute. You can't
add other attributes to it.

The correct thing should be to create "class_tty" with all necessary attributes
(speed, data transferred, etc).

But thats not a v2.6 thing I believe.

I talked to Greg about this at the time and he agreed we need a "class_tty"

> Cheers :)
> Germano
> On Tue, Nov 02, 2004 at 02:51:33PM -0600, Kilau, Scott wrote:
> > > I know you have done work on USB serial drivers with devices with
> > > multiple ports...
> > > Is there any way to create a file in sys that can point back to a port,
> > > and NOT the port's
> > > parent (ie, the board) WITHOUT having to create a new kobject per port?
> What's wrong with the kobject in /sys/class/tty/ which has one object
> per port? I think we might not be exporting that class_device
> structure, but I would not have a problem with doing that.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 14:07    [W:0.052 / U:14.004 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site