[Bluez-devel] loading of hci_uart.ko

[Bluez-devel] loading of hci_uart.ko

[Choi Sonim]

hi all,

I want to ask.
when I do "hciattach /dev/ttyS0 any", somehow the needed module
hci_uart.ko is loaded.
I looked in hciattach.c but I do not see how is it done.
can u please help me here ?

thank you very much all
choi.

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Re: [Bluez-devel] loading of hci_uart.ko

[Marcel Holtmann]

Hi Choi,

> I want to ask.
> when I do "hciattach /dev/ttyS0 any", somehow the needed module
> hci_uart.ko is loaded.
> I looked in hciattach.c but I do not see how is it done.
> can u please help me here ?

# modinfo hci_uart
alias:          tty-ldisc-15

It tells the kernel to load this module if any application request the
line discipline 15.

Regards

Marcel



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Re: [Bluez-devel] loading of hci_uart.ko

[Choi Sonim]

Hi Marcel,

On 1/19/07, Marcel Holtmann <marcel@holtmann.org> wrote:
> > when I do "hciattach /dev/ttyS0 any", somehow the needed module
> > hci_uart.ko is loaded.
> > I looked in hciattach.c but I do not see how is it done ?
>
> # modinfo hci_uart
> alias:          tty-ldisc-15
>
> It tells the kernel to load this module if any application request the
> line discipline 15.

can you please elaborate on this ? when the app request the HCI line
discipline, how does the kernel knows it need to look for alias tty-ldisc-15 ?
does it then run modprobe ?
what code is responsible for that ?

thank you very much for the help
choi
>
> Regards
>
> Marcel
>
>
>
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Re: [Bluez-devel] loading of hci_uart.ko

[Marcel Holtmann]

Hi Choi,

> > > when I do "hciattach /dev/ttyS0 any", somehow the needed module
> > > hci_uart.ko is loaded.
> > > I looked in hciattach.c but I do not see how is it done ?
> >
> > # modinfo hci_uart
> > alias:          tty-ldisc-15
> >
> > It tells the kernel to load this module if any application request the
> > line discipline 15.
> 
> can you please elaborate on this ? when the app request the HCI line
> discipline, how does the kernel knows it need to look for alias tty-ldisc-15 ?
> does it then run modprobe ?
> what code is responsible for that ?

the kernel actually doesn't care what's the module name of module
providing the line discipline 15. It simply requests the loading of the
module and the userspace (insmod/modprobe) has to resolve this.

Regards

Marcel



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Re: [Bluez-devel] loading of hci_uart.ko

[Choi Sonim]

On 1/29/07, Marcel Holtmann <marcel@holtmann.org> wrote:
> Hi Choi,
>
> > > > when I do "hciattach /dev/ttyS0 any", somehow the needed module
> > > > hci_uart.ko is loaded.
> > > > I looked in hciattach.c but I do not see how is it done ?
> > >
> > > # modinfo hci_uart
> > > alias:          tty-ldisc-15
> > >
> > > It tells the kernel to load this module if any application request the
> > > line discipline 15.
> >
> > can you please elaborate on this ? when the app request the HCI line
> > discipline, how does the kernel knows it need to look for alias tty-ldisc-15 ?
> > does it then run modprobe ?
> > what code is responsible for that ?
>
> the kernel actually doesn't care what's the module name of module
> providing the line discipline 15. It simply requests the loading of the
> module and the userspace (insmod/modprobe) has to resolve this.

thank you very much
choi

>
> Regards
>
> Marcel
>
>
>