Message-Id: <5.1.0.14.2.20030717172101.072ffe28@unixmail.qualcomm.com>
To: James Courtier-Dutton <James@superbug.demon.co.uk>, bluez-devel@lists.sourceforge.net
From: Max Krasnyansky <maxk@qualcomm.com>
Subject: Re: [Bluez-devel] hci_usb module interrupts?
In-Reply-To: <3F048FF4.4080609@superbug.demon.co.uk>
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Sender: bluez-devel-admin@lists.sourceforge.net
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Date: Thu, 17 Jul 2003 17:25:21 -0700

At 01:20 PM 7/3/2003, James Courtier-Dutton wrote:
>I have the following bluez modules loaded: -
>hci_usb                 8088   1
>bluez                  32356   1  [hci_usb]
>
>hciconfig hci0 down
>No interrupts from the bluetooth device.
>hciconfig hci0 up
>About 100 interrupts per second from the bluetooth device.
>hciconfig hci0 down
>No more interrupts from the bluetooth device.
>
>There is no actual data coming from the bluetooth device, as I can check with hcidump. We get a few lines of output at the transition from up to down and down to up, but nothing in between.
>
>Is this activity normal?
>Does is happen with the PC card or PCI card usb adapters ?
>It seems to me that these interrupts should not be there.

Do you have SCO support compiled it ?
Also USB is a pulled bus. ie HC pulls device. When we bring device up we submit URB read requests.
I believe those can trigger interrupts even if there are no actual transfers.

Max


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