[Bluez-devel] Broadcom 2035 SCO question

[Bluez-devel] Broadcom 2035 SCO question

[Fabien Chevalier]

Hi all,

I recently purchased a class 1 "sweex" bluetooth USB dongle.  It has a 
broadcom bcm2035
usb chip( idVendor = 0x0a5c, idProduct = 0x200a). It advertises SCO 
mtu=16, sco packets = 0.
I tryed to use it with SCO, no luck.(I wasn't surprised by that, given 
sco packets = 0) Then i looked at hci usb driver and found it was in the 
blacklist, with HCI_BROKEN_ISOC.

I then removed it from this list, forced SCO mtu to 48 and packets 
number to 8 by hacking hci_event.c... and guess what, it works !!

So my question is: shouldn't this product marked as HCI_WRONG_SCO_MTU 
mtu instead of HCI_BROKEN_ISOC?

Cheers,

Fabien


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Re: [Bluez-devel] Broadcom 2035 SCO question

[Marcel Holtmann]

Hi Fabien,

> I recently purchased a class 1 "sweex" bluetooth USB dongle.  It has a 
> broadcom bcm2035
> usb chip( idVendor = 0x0a5c, idProduct = 0x200a). It advertises SCO 
> mtu=16, sco packets = 0.
> I tryed to use it with SCO, no luck.(I wasn't surprised by that, given 
> sco packets = 0) Then i looked at hci usb driver and found it was in the 
> blacklist, with HCI_BROKEN_ISOC.
> 
> I then removed it from this list, forced SCO mtu to 48 and packets 
> number to 8 by hacking hci_event.c... and guess what, it works !!
> 
> So my question is: shouldn't this product marked as HCI_WRONG_SCO_MTU 
> mtu instead of HCI_BROKEN_ISOC?

is it enough to change HCI_BROKEN_ISOC into HCI_WRONG_SCO_MTU to make
this work. If yes, then I am happy to submit a patch.

Regards

Marcel




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Re: [Bluez-devel] Broadcom 2035 SCO question

[Fabien Chevalier]

[-- Attachment #1: Type: text/plain, Size: 991 bytes --]

Hi All,

Please see comments below :

> Hi Fabien,
> 
>> I recently purchased a class 1 "sweex" bluetooth USB dongle.  It has a 
>> broadcom bcm2035
>> usb chip( idVendor = 0x0a5c, idProduct = 0x200a). It advertises SCO 
>> mtu=16, sco packets = 0.
>> I tryed to use it with SCO, no luck.(I wasn't surprised by that, given 
>> sco packets = 0) Then i looked at hci usb driver and found it was in the 
>> blacklist, with HCI_BROKEN_ISOC.
>>
>> I then removed it from this list, forced SCO mtu to 48 and packets 
>> number to 8 by hacking hci_event.c... and guess what, it works !!
>>
>> So my question is: shouldn't this product marked as HCI_WRONG_SCO_MTU 
>> mtu instead of HCI_BROKEN_ISOC?
> 
> is it enough to change HCI_BROKEN_ISOC into HCI_WRONG_SCO_MTU to make
> this work. If yes, then I am happy to submit a patch.
> 

Yes. It is not perfect (i have some noise sometimes at startup), but it
is enough to make it work.

Please find attached one-line patch for this.

cheers,

Fabien


[-- Attachment #2: patch-bcm2035.diff --]
[-- Type: text/plain, Size: 489 bytes --]

--- hci_usb.c	2006-07-15 15:32:34.000000000 +0200
+++ hci_usb.c	2006-07-15 15:32:47.000000000 +0200
@@ -108,7 +108,7 @@
 	{ USB_DEVICE(0x0a5c, 0x2033), .driver_info = HCI_IGNORE },
 
 	/* Broadcom BCM2035 */
-	{ USB_DEVICE(0x0a5c, 0x200a), .driver_info = HCI_RESET | HCI_BROKEN_ISOC },
+	{ USB_DEVICE(0x0a5c, 0x200a), .driver_info = HCI_RESET | HCI_WRONG_SCO_MTU },
 	{ USB_DEVICE(0x0a5c, 0x2009), .driver_info = HCI_BCM92035 },
 
 	/* Microsoft Wireless Transceiver for Bluetooth 2.0 */


[-- Attachment #3: Type: text/plain, Size: 375 bytes --]


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[-- Attachment #4: Type: text/plain, Size: 164 bytes --]

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Re: [Bluez-devel] Broadcom 2035 SCO question

[Marcel Holtmann]

Hi Fabien,

> >> I recently purchased a class 1 "sweex" bluetooth USB dongle.  It has a 
> >> broadcom bcm2035
> >> usb chip( idVendor = 0x0a5c, idProduct = 0x200a). It advertises SCO 
> >> mtu=16, sco packets = 0.
> >> I tryed to use it with SCO, no luck.(I wasn't surprised by that, given 
> >> sco packets = 0) Then i looked at hci usb driver and found it was in the 
> >> blacklist, with HCI_BROKEN_ISOC.
> >>
> >> I then removed it from this list, forced SCO mtu to 48 and packets 
> >> number to 8 by hacking hci_event.c... and guess what, it works !!
> >>
> >> So my question is: shouldn't this product marked as HCI_WRONG_SCO_MTU 
> >> mtu instead of HCI_BROKEN_ISOC?
> > 
> > is it enough to change HCI_BROKEN_ISOC into HCI_WRONG_SCO_MTU to make
> > this work. If yes, then I am happy to submit a patch.
> > 
> 
> Yes. It is not perfect (i have some noise sometimes at startup), but it
> is enough to make it work.
> 
> Please find attached one-line patch for this.

a patch for this is in my tree now.

Regards

Marcel



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