linux-kernel - Re: serio / atkbd / PS/2 Strangeness with Serial port adapter

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Message-Id: <200908061604.30382.gustavo@compunauta.com>
Date:	Thu, 6 Aug 2009 16:04:30 -0500
From:	Gustavo Guillermo Perez <gustavo@...punauta.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: serio / atkbd / PS/2 Strangeness with Serial port adapter

El Jueves, 6 de Agosto de 2009, escribió:
> Hello!
>
> Apologies if this really is't the right forum (suggestions on the
> right forum would be welcome).
>
> We are switching from an old 2.4 kernel on our thin clients to 2.6
> (2.6.28-gentoo-r5).
You missed the serial io port driver.

kernel/drivers/input/serio
> Things are working well - except for one problem.  One the new image,
> some of the input devices don't work we expected.  We have a number of
> different barcode scanners that attach to these terminals.  Many of the new
> ones are USB HID compliant devices - which is great.  Most of them are
> actually serial port devices, that connect to the terminal via a
> serial --> PS/2 'wedge'.  The PS/2 wedge devices are the ones that
> don't work correctly.
>
> If we connect the scanner to the thin client, and boot the image, the
> scanner does not work.  It does not show up at all as an input device:
>
> blablahostname / # cat /proc/bus/input/devices
> I: Bus=0003 Vendor=046d Product=c001 Version=0110
> N: Name="Logitech USB Mouse"
> P: Phys=usb-0000:00:03.0-1/input0
> S: Sysfs=/devices/pci0000:00/0000:00:03.0/usb2/2-1/2-1:1.0/input/input0
> U: Uniq=
> H: Handlers=mouse0 event0
> B: EV=17
> B: KEY=70000 0 0 0 0 0 0 0 0
> B: REL=103
> B: MSC=10
>
> I: Bus=0003 Vendor=03f0 Product=0024 Version=0110
> N: Name="CHICONY HP Basic USB Keyboard"
> P: Phys=usb-0000:00:03.1-2/input0
> S: Sysfs=/devices/pci0000:00/0000:00:03.1/usb3/3-2/3-2:1.0/input/input1
> U: Uniq=
> H: Handlers=kbd event1
> B: EV=120013
> B: KEY=10000 7 ff9f207a c14057ff febeffdf ffefffff ffffffff fffffffe
> B: MSC=10
> B: LED=7
>
> I: Bus=0010 Vendor=001f Product=0001 Version=0100
> N: Name="PC Speaker"
> P: Phys=isa0061/input0
> S: Sysfs=/devices/platform/pcspkr/input/input2
> U: Uniq=
> H: Handlers=kbd event2
> B: EV=40001
> B: SND=6
>
> So, I enabled debugging on the contoller driver(serio.c), and I see
> that the device generates noise when connected:
>
> [  458.875614] drivers/input/serio/i8042.c: f2 -> i8042 (kbd-data) [444989]
> [  458.908119] drivers/input/serio/i8042.c: fe <- i8042 (interrupt, 0,
> 1, timeout) [445022]
> [  458.908144] drivers/input/serio/i8042.c: ed -> i8042 (kbd-data) [445022]
> [  458.940151] drivers/input/serio/i8042.c: fe <- i8042 (interrupt, 0,
> 1, timeout) [445054]
> [  458.940225] drivers/input/serio/i8042.c: d4 -> i8042 (command) [445054]
> [  458.940234] drivers/input/serio/i8042.c: f2 -> i8042 (parameter)
> [445054] [  458.972190] drivers/input/serio/i8042.c: fe <- i8042
> (interrupt, 1, 12, timeout) [445086]
> [  458.972204] drivers/input/serio/i8042.c: d4 -> i8042 (command) [445086]
> [  458.972212] drivers/input/serio/i8042.c: ed -> i8042 (parameter)
> [445086] [  459.004227] drivers/input/serio/i8042.c: fe <- i8042
> (interrupt, 1, 12, timeout) [445118]
> [20171.684870] drivers/input/serio/i8042.c: 0b <- i8042 (interrupt, 0,
> 1) [20162195]
>
> However - the atkbd driver does not pick the device up at all.
>
> So, I did find a workaround (which is NOT acceptable for this
> deployment).  Remember the PS/2 'wedge' I mentioned?  Well, it has an
> extra PS/2 port for your keyboard.  If I connect a PS/2 keyboard to
> that thing, suddenly my scanner starts working.
>
> We see some chatter from the controller driver, then one of these:
>
> [23811.805578] input: AT Translated Set 2 keyboard as
> /devices/platform/i8042/serio0/input/input6
>
> Aaaand a new device is registered as an input device:
>
> yayayayhostname# cat /proc/bus/input/devices
> I: Bus=0003 Vendor=046d Product=c001 Version=0110
> N: Name="Logitech USB Mouse"
> P: Phys=usb-0000:00:03.0-1/input0
> S: Sysfs=/devices/pci0000:00/0000:00:03.0/usb2/2-1/2-1:1.0/input/input0
> U: Uniq=
> H: Handlers=mouse0 event0
> B: EV=17
> B: KEY=70000 0 0 0 0 0 0 0 0
> B: REL=103
> B: MSC=10
>
> I: Bus=0003 Vendor=03f0 Product=0024 Version=0110
> N: Name="CHICONY HP Basic USB Keyboard"
> P: Phys=usb-0000:00:03.1-2/input0
> S: Sysfs=/devices/pci0000:00/0000:00:03.1/usb3/3-2/3-2:1.0/input/input1
> U: Uniq=
> H: Handlers=kbd event1
> B: EV=120013
> B: KEY=10000 7 ff9f207a c14057ff febeffdf ffefffff ffffffff fffffffe
> B: MSC=10
> B: LED=7
>
> I: Bus=0010 Vendor=001f Product=0001 Version=0100
> N: Name="PC Speaker"
> P: Phys=isa0061/input0
> S: Sysfs=/devices/platform/pcspkr/input/input2
> U: Uniq=
> H: Handlers=kbd event2
> B: EV=40001
> B: SND=6
>
> I: Bus=0011 Vendor=0001 Product=0001 Version=ab41
> N: Name="AT Translated Set 2 keyboard"
> P: Phys=isa0060/serio0/input0
> S: Sysfs=/devices/platform/i8042/serio0/input/input6
> U: Uniq=
> H: Handlers=kbd event3
> B: EV=120013
> B: KEY=4 2000000 3803078 f800d001 feffffdf ffefffff ffffffff fffffffe
> B: MSC=10
> B: LED=7
>
> Here is an lsmod, and I've attached .config in case it's helpful:
>
> Module                  Size  Used by
> ppdev                   6276  0
> parport_pc             26512  1
> lp                      8560  0
> parport                26824  3 ppdev,parport_pc,lp
> pcspkr                  2176  0
> atkbd                  15508  0
> ohci_hcd               28308  0
>
> So, I don't get it.  We had this all working fine with the (now
> ancient version) LTSP configuration, linux 2.4, etc.  Did some drastic
> things change in 2.6 with keyboard management?
>
> I am completely out of ideas.  The only thing I can figure is that the
> PS/2 wedge thing isn't doing the right thing, and as a result the 2.6
> version of the atkbd driver isn't binding it?   Maybe there is some
> udev magic I need to know?
>
> Apologies if I've missed something obvious here.  Any help would be
> much appreciated!
> Thanks!



-- 
Gustavo Guillermo Pérez
www.compunauta.com
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