PC speaker listed as input device

PC speaker listed as input device

[Panagiotis Issaris]

Hi,

While trying to get my Hauppauge's remote control working, I noticed that my
PC speaker is getting recognized as an input device. This seems very weird
to me, is there some logic behind this?

takis@aether:~$ cat /proc/bus/input/devices
I: Bus=0010 Vendor=001f Product=0001 Version=0100
N: Name="PC Speaker"
P: Phys=isa0061/input0
S: Sysfs=/class/input/input0
H: Handlers=kbd event0
B: EV=40001
B: SND=6
...

I'm using the 2.6.17 kernel (it is an Ubuntu kernel though).

With friendly regards,
Takis

Re: PC speaker listed as input device

[Adam Henley]

On 23/10/06, Panagiotis Issaris <panagiotis@gmail.com> wrote:
> Hi,
>
> While trying to get my Hauppauge's remote control working, I noticed that my
> PC speaker is getting recognized as an input device. This seems very weird
> to me, is there some logic behind this?

Simple, all speakers are microphones!
(http://www.google.com/search?q=%22a+speaker+as+a+microphone%22)

Though I don't know the real reason for recognising a speaker as an
input device, this could be a "logical" explanation :o)

regards,

adam
(should probably reply to lkml as well...)

Re: PC speaker listed as input device

[Pavel Machek]

On Mon 23-10-06 20:53:07, Panagiotis Issaris wrote:
> Hi,
> 
> While trying to get my Hauppauge's remote control 
> working, I noticed that my
> PC speaker is getting recognized as an input device. 
> This seems very weird
> to me, is there some logic behind this?

Some keyboards have speakers build-in (sparc).

-- 
Thanks for all the (sleeping) penguins.

Re: PC speaker listed as input device

[Panagiotis Issaris]

Hi,

Adam Henley <adamazing <at> gmail.com> writes:
> On 23/10/06, Panagiotis Issaris <panagiotis <at> gmail.com> wrote:
> > Hi,
> >
> > While trying to get my Hauppauge's remote control working, I noticed that my
> > PC speaker is getting recognized as an input device. This seems very weird
> > to me, is there some logic behind this?
> 
> Simple, all speakers are microphones!
> (http://www.google.com/search?q=%22a+speaker+as+a+microphone%22)
> 
> Though I don't know the real reason for recognising a speaker as an
> input device, this could be a "logical" explanation :o)
It would be if it would be recognised as /dev/dsp4 or something... but
/dev/input/event4 makes it look like a mouse or keyboard which still
seems very weird and illogical to me :)

With friendly regards,
Takis

Re: PC speaker listed as input device

[Jan Engelhardt]

>
>The Input subsystem also covers simple beeps, because real keyboards
>beep.  So it was only straight-forward to also put the PC speaker into

"What is real?" -from Matrix

That said, older keyboards, such as SUN4, do indeed beep themselves. In fact,
it's just a matter where the beeper is installed, even on x86, you can see the
history of it, because the IO port for beeps is the same as for keyboard leds.


	-`J'
-- 

Re: PC speaker listed as input device

[Jan-Benedict Glaw]

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On Mon, 2006-10-23 20:32:55 +0200, Panagiotis Issaris <panagiotis@gmail.com> wrote:
> While trying to get my Hauppauge's remote control working, I noticed that my
> PC speaker is getting recognized as an input device. This seems very weird
> to me, is there some logic behind this?
> 
> takis@aether:~$ cat /proc/bus/input/devices
> I: Bus=0010 Vendor=001f Product=0001 Version=0100
> N: Name="PC Speaker"
> P: Phys=isa0061/input0
> S: Sysfs=/class/input/input0
> H: Handlers=kbd event0
> B: EV=40001
> B: SND=6
> ...

The Input subsystem also covers simple beeps, because real keyboards
beep.  So it was only straight-forward to also put the PC speaker into
the Input subsystem to be able to emulate real keyboard's beeps as
good as possible :)

MfG, JBG

-- 
      Jan-Benedict Glaw      jbglaw@lug-owl.de              +49-172-7608481
  Signature of:                        Lauf nicht vor Deinem Glück davon:
  the second  :                             Es könnte hinter Dir stehen!

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PC speaker listed as input device

[Panagiotis Issaris]

Hi,

While trying to get my Hauppauge's remote control working, I noticed that my
PC speaker is getting recognized as an input device. This seems very weird
to me, is there some logic behind this?

 takis@aether:~$ cat /proc/bus/input/devices
I: Bus=0010 Vendor=001f Product=0001 Version=0100
N: Name="PC Speaker"
P: Phys=isa0061/input0
S: Sysfs=/class/input/input0
H: Handlers=kbd event0
B: EV=40001
B: SND=6
...

I'm using the 2.6.17 kernel (it is an Ubuntu kernel though).

With friendly regards,
Takis