serio interface

serio interface

[Lars K.W. Gohlke]

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hallo,

wouldsomebody explain me the serio interface or give me a code link for
very simple example.




thx. in advance

- ------------------------
Mit freundlichen Grüßen
Lars K.W. Gohlke
mailto:lkwg82@gmx.de
- -------------------------
Visit http://www.lars-gohlke.de.vu

06.06.2007 11:10
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Re: serio interface

[Jan-Benedict Glaw]

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On Wed, 2007-06-06 11:11:23 +0200, Lars K.W. Gohlke <lkwg82@gmx.de> wrote:
> wouldsomebody explain me the serio interface or give me a code link for
> very simple example.

What do you want to do with it?  Do you want on the serial port side,
or on the mouse/keyboard/gadget side?  See for example the various
serial keyboards and mice drivers.

MfG, JBG

-- 
      Jan-Benedict Glaw      jbglaw@lug-owl.de              +49-172-7608481
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Re: serio interface

[Lars K.W. Gohlke]

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Jan-Benedict Glaw schrieb:
> On Wed, 2007-06-06 11:11:23 +0200, Lars K.W. Gohlke <lkwg82@gmx.de> wrote:
>> wouldsomebody explain me the serio interface or give me a code link for
>> very simple example.
>
> What do you want to do with it?  Do you want on the serial port side,
> or on the mouse/keyboard/gadget side?  See for example the various
> serial keyboards and mice drivers.
>
> MfG, JBG
>
I want on the kernelside process data from first uart-hardware interface
aka ttyS0.

I don't understand the structure of e.g. input/mouse/sermouse.c

where is said, which hardware is used for reading data from?

mfg
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Re: serio interface

[Jan-Benedict Glaw]

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On Wed, 2007-06-06 11:34:49 +0200, Lars K.W. Gohlke <lkwg82@gmx.de> wrote:
> Jan-Benedict Glaw schrieb:
> > On Wed, 2007-06-06 11:11:23 +0200, Lars K.W. Gohlke <lkwg82@gmx.de> wrote:
> > > wouldsomebody explain me the serio interface or give me a code link for
> > > very simple example.
> >
> > What do you want to do with it?  Do you want on the serial port side,
> > or on the mouse/keyboard/gadget side?  See for example the various
> > serial keyboards and mice drivers.
>
> I want on the kernelside process data from first uart-hardware interface
> aka ttyS0.
> 
> I don't understand the structure of e.g. input/mouse/sermouse.c
> 
> where is said, which hardware is used for reading data from?

I'm not entirely sure, but I guess that most of the time, you assign a
serial port with the help of `inputattach' to a given device driver,
which expects to find its hardware on that port.

OTOH, why do you want to do the serial stuff in kernel land? Isn't it
a *lot* easier to do it in userspace? What's your specific device you
want to work on?

MfG, JBG

-- 
      Jan-Benedict Glaw      jbglaw@lug-owl.de              +49-172-7608481
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Re: serio interface

[Lars K.W. Gohlke]

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Jan-Benedict Glaw schrieb:
> On Wed, 2007-06-06 11:34:49 +0200, Lars K.W. Gohlke <lkwg82@gmx.de> wrote:
>> Jan-Benedict Glaw schrieb:
>>> On Wed, 2007-06-06 11:11:23 +0200, Lars K.W. Gohlke <lkwg82@gmx.de> wrote:
>>>> wouldsomebody explain me the serio interface or give me a code link for
>>>> very simple example.
>>> What do you want to do with it?  Do you want on the serial port side,
>>> or on the mouse/keyboard/gadget side?  See for example the various
>>> serial keyboards and mice drivers.
>> I want on the kernelside process data from first uart-hardware interface
>> aka ttyS0.
>>
>> I don't understand the structure of e.g. input/mouse/sermouse.c
>>
>> where is said, which hardware is used for reading data from?
>
> I'm not entirely sure, but I guess that most of the time, you assign a
> serial port with the help of `inputattach' to a given device driver,
> which expects to find its hardware on that port.
>
> OTOH, why do you want to do the serial stuff in kernel land? Isn't it
> a *lot* easier to do it in userspace? What's your specific device you
> want to work on?
>
> MfG, JBG
>

if you want to write a driver, there must be a possibility to get the
data, like others do. (kernel-space)

I want to know where I can get and how to do.

At least I want to be able to copy the data from device to another
(maybe own).

It is to get familiar with that.

thx
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Re: serio interface

[Jan-Benedict Glaw]

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On Wed, 2007-06-06 12:39:17 +0200, Lars K.W. Gohlke <lkwg82@gmx.de> wrote:
> Jan-Benedict Glaw schrieb:
> > OTOH, why do you want to do the serial stuff in kernel land? Isn't it
> > a *lot* easier to do it in userspace? What's your specific device you
> > want to work on?

[snip]

You didn't actually answer any of my questions.

MfG, JBG

-- 
      Jan-Benedict Glaw      jbglaw@lug-owl.de              +49-172-7608481
Signature of:         "really soon now":      an unspecified period of time, likly to
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Re: serio interface

[Lars K.W. Gohlke]

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Jan-Benedict Glaw schrieb:
> On Wed, 2007-06-06 12:39:17 +0200, Lars K.W. Gohlke <lkwg82@gmx.de> wrote:
>> Jan-Benedict Glaw schrieb:
>>> OTOH, why do you want to do the serial stuff in kernel land? Isn't it
>>> a *lot* easier to do it in userspace? What's your specific device you
>>> want to work on?
>
> [snip]
>
> You didn't actually answer any of my questions.
>
> MfG, JBG
>
sorry.

I want to use the interface aka /dev/ttyS0.
I want to process data inside of a kernel module to provide it /proc
(done) or as own char-dev (done).

but I can not grab the data.

It is part of my project in my studies.

It is more a conceptual work, but important. I want to release a howto,
when I complete.

answered completely? ;) Hope so.
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Re: serio interface

[Jiri Slaby]

Lars K.W. Gohlke napsal(a):
> hallo,
> 
> wouldsomebody explain me the serio interface or give me a code link for
> very simple example.

Something like this?
http://examples.oreilly.com/linuxdrive3/

examples/tty/tiny_serial.c

Some things are obsoleted, but main code flow remains.

regards,
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Re: serio interface

[Jan-Benedict Glaw]

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On Wed, 2007-06-06 12:52:13 +0200, Lars K.W. Gohlke <lkwg82@gmx.de> wrote:
> Jan-Benedict Glaw schrieb:
> > On Wed, 2007-06-06 12:39:17 +0200, Lars K.W. Gohlke <lkwg82@gmx.de> wrote:
> > > Jan-Benedict Glaw schrieb:
> > > > OTOH, why do you want to do the serial stuff in kernel land? Isn't it
> > > > a *lot* easier to do it in userspace? What's your specific device you
> > > > want to work on?
>
> > You didn't actually answer any of my questions.

> sorry.
> 
> I want to use the interface aka /dev/ttyS0.
> I want to process data inside of a kernel module to provide it /proc
> (done) or as own char-dev (done).
> 
> but I can not grab the data.
> 
> It is part of my project in my studies.
> 
> It is more a conceptual work, but important. I want to release a howto,
> when I complete.

You still answer unasked questions. Please answer inline:

  * Why do you wanto to do the serial stuff in kernel land?

  * Isn't it easier to do it in userspace?

  * What specific device do you work on?

  * New: Is it a wise idea to do it in kernel land?

The /proc filesystem has been somewhat obsoleted in favour of sysfs
for device/driver information.

-- 
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Re: serio interface

[Lars K.W. Gohlke]

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Jan-Benedict Glaw schrieb:
> On Wed, 2007-06-06 12:52:13 +0200, Lars K.W. Gohlke <lkwg82@gmx.de> wrote:
>> Jan-Benedict Glaw schrieb:
>>> On Wed, 2007-06-06 12:39:17 +0200, Lars K.W. Gohlke <lkwg82@gmx.de> wrote:
>>>> Jan-Benedict Glaw schrieb:
>>>>> OTOH, why do you want to do the serial stuff in kernel land? Isn't it
>>>>> a *lot* easier to do it in userspace? What's your specific device you
>>>>> want to work on?
>>> You didn't actually answer any of my questions.
>
>> sorry.
>>
>> I want to use the interface aka /dev/ttyS0.
>> I want to process data inside of a kernel module to provide it /proc
>> (done) or as own char-dev (done).
>>
>> but I can not grab the data.
>>
>> It is part of my project in my studies.
>>
>> It is more a conceptual work, but important. I want to release a howto,
>> when I complete.
>
> You still answer unasked questions. Please answer inline:
>
>   * Why do you wanto to do the serial stuff in kernel land?
It is more a conceptual work, but important. I want to release a howto,
when I complete.
>
>   * Isn't it easier to do it in userspace?
yes
>
>   * What specific device do you work on?
I want to use the interface aka /dev/ttyS0. (text-stream)
>
>   * New: Is it a wise idea to do it in kernel land?
no, explicitly not. To get known hwo to deal with data from devices.
>
> The /proc filesystem has been somewhat obsoleted in favour of sysfs
> for device/driver information.
>

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Re: serio interface

[Tilman Schmidt]

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Am 06.06.2007 11:51 schrieb Jan-Benedict Glaw:
> On Wed, 2007-06-06 11:34:49 +0200, Lars K.W. Gohlke <lkwg82@gmx.de> wrote:

>> I want on the kernelside process data from first uart-hardware interface
>> aka ttyS0.
>>
>> I don't understand the structure of e.g. input/mouse/sermouse.c
>>
>> where is said, which hardware is used for reading data from?
> 
> I'm not entirely sure, but I guess that most of the time, you assign a
> serial port with the help of `inputattach' to a given device driver,
> which expects to find its hardware on that port.
> 
> OTOH, why do you want to do the serial stuff in kernel land? Isn't it
> a *lot* easier to do it in userspace? What's your specific device you
> want to work on?

May I chime in here, as it's a topic I am interested in too.

Have a look at drivers/isdn/gigaset/ser-gigaset.c if you like,
a driver for an ISDN adapter attached via RS232.

This is currently implemented as a line discipline, but I consider
that a hack. For one thing, it doesn't really fit the concept of a
line discipline because it doesn't transform the serial datastream
but instead diverts it completely to the isdn4linux subsystem. And
second, it means that a userspace daemon is needed which does
nothing but open the serial port, set the line discipline on it,
and go to sleep in order to keep the line discipline loaded.

The serio approach used by input/mouse/sermouse.c might provide a
more sensible way of driving that kind of device.

-- 
Tilman Schmidt                          E-Mail: tilman@imap.cc
Bonn, Germany
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Re: serio interface

[Tilman Schmidt]

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/me wrote:
> Have a look at drivers/isdn/gigaset/ser-gigaset.c if you like,
> a driver for an ISDN adapter attached via RS232.
> 
> This is currently implemented as a line discipline, but I consider
> that a hack. [...]
> The serio approach used by input/mouse/sermouse.c might provide a
> more sensible way of driving that kind of device.

Apparently it won't. As I have learned in the meantime, the serio
mechanism in turn just uses a line discipline to actually attach
itself to the serial port. So the line discipline interface
remains "the" way to write a layered driver on top of RS232.

Thanks,

-- 
Tilman Schmidt                    E-Mail: tilman@imap.cc
Bonn, Germany
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