Re: patch for sysfs in the cyclades driver

From: Marcelo Tosatti (marcelo.tosatti_at_cyclades.com)
Date: 11/04/04

  • Next message: Michael J. Cohen: "Re: [patch] Real-Time Preemption, -RT-2.6.10-rc1-mm2-V0.7.7" 
    Date:	Thu, 4 Nov 2004 08:25:05 -0200
To: Germano <germano.barreiro@cyclades.com>

    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"
    type.

    > 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 majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

  • Next message: Michael J. Cohen: "Re: [patch] Real-Time Preemption, -RT-2.6.10-rc1-mm2-V0.7.7"

    Relevant Pages

    • Re: patch for sysfs in the cyclades driver
      ... If I can attach this data to the port, ... 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). ... send the line "unsubscribe linux-kernel" in ...
      (Linux-Kernel)
    • Re: Problems with USB/VISOR module
      ... On Thu, 25 Sep 2003, Greg KH wrote: ... # Why are you trying to attach to port 0? ... send the line "unsubscribe linux-kernel" in ...
      (Linux-Kernel)
    • rs232...
      ... Hello Scott and everyone else who will read this post. ... //immediatelly assigned to this array. ... // from the rs232 port), ... I thank Scott and all members of the news groups that have helped me on the ...
      (microsoft.public.vc.language)
    • libata: dma, io error messages
      ... abnormal status 0xD0 on port 0xD081B087 ... Unrecovered read error - auto reallocate failed ... I/O error, dev sda, sector 33935366 ... send the line "unsubscribe linux-kernel" in ...
      (Linux-Kernel)
    • RE: KLive: Linux Kernel Live Usage Monitor
      ... Some of us sit behind corporate firewalls and proxies that have ... The proxy settings could also be a .config thing. ... use port 25 because everybody has port 25 open ... send the line "unsubscribe linux-kernel" in ...
      (Linux-Kernel)