Re: Query on root hub driver

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On Jan 9, 2:23 am, "Doron Holan [MSFT]" <dor...@xxxxxxxxxxxxxxxxxxxx>
wrote:
read the usb host controller specification and the class spec for hubs, it
describes how notifications work for root hubs as well as downstream hubs

d

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"rp01" <rashmipodu...@xxxxxxxxx> wrote in message

news:d4d87a0d-3a8a-4005-b319-15c09781d756@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Hello,
I have a query on USB root hub driver.
Who informs the root hub driver about presence/absence of a device (on
a port)? Is it the port driver, hub hardware or something else and
how?
Which interface is used for the purpose in windows ddk?

I am trying to load the root hub driver through my host controller
driver (custom driver which does not use USB hardware), which
successfully loads a mass storage class driver (appropriate
descriptors returned on first enumeration). However I would like to
know what is the trigger for the hub driver to send the getdescriptor
request for another device?

Thanks,
Rashmi

Thanks Doron.

Going through the spec it isn't clear to me if the hub hardware
informs of the port status (through some interrupt mechanism etc) to
hub driver or is it the port driver that informs the hub driver. Could
you please throw some light on this?


.

Relevant Pages

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