Re: [Bluez-devel] /sys/devices/platform/bluetooth

[Marcel Holtmann <marcel@holtmann.org>]

Hi Choi,

> > > > > Where is the code that does the platform registration to this device :
> > > > > /sys/devices/platform/bluetooth
> > > >
> > > > you find it in net/bluetooth/hci_sysfs.c in the kernel source code.
> > >
> > > What is the purpose of the bluetooth platform device (and bus and class..) ?
> > >
> > > I guess that bluetooth devices would prefer to register themselves as children
> > > of their true bus (like USB or PCI or even serial) so when the system goes
> > > to suspend, their suspend function will be called before their father's
> > > (the true hardware bus of our bluetooth device).
> >
> > if they do have a physical parent. Some devices like virtual HCI or
> > serial based chips don't have a physical parent.
> 
> About the serial based chips -
> I'm sure they would like their suspend function to be called before the
> serial uart driver's suspend, so for them to set device parent to the
> serial device
> can be a benefit too, no ?

if you write a chip specific driver then yes. For all line discipline
based ones at the moment, you are simply out of luck.

> About the virtual HCI - I really don't know what are them, can you please
> explain this ?

You can emulate a HCI host device in userspace using hciemu.

Regards

Marcel



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